Registration sheet with improved printing quality at low levels of additives

FIELD: printing.

SUBSTANCE: invention relates to recording sheets used in printing processes. The recording sheet comprises a substrate of the web of cellulosic fibres and the sizing composition. The sizing composition comprises a binder and a divalent metal salt. The said salt in a concentration of at least 51% of the total concentration and not less than 2500 parts per million is located at a distance within 25% of the total substrate thickness from at least one surface of the said substrate. At that the recording sheet has Qtotal as a measure of the amount of the sizing agent in the transition from the outer edges towards the middle of the sheet in cross-section of less than 0.5. Also a method of production of the recording sheet is described.

EFFECT: said substrate and the sizing agent interact with formation of the I-shaped structure of the recording sheet which provides an optical density of black printing of at least 1,15.

20 cl, 15 dwg, 2 tbl, 10 ex

 

The technical field

The present invention relates to recording sheets, for example, the recording sheets on a paper basis, with improved print quality. The invention also relates to methods of manufacturing and methods of use of the recording sheets. Although they are suitable for use in any printing process, the recording sheets are particularly suitable for inkjet printing processes.

Description of the prior art

The paper base with the so-called structure "I-beams", developed recently and reportedly have improved volumetric stiffness and/or high dimensional stability. See, for example, patent application U.S. 2004/0065423, published on 8 April 2004, which revealed a three-layer sheet with I-beam structure, which has a Central pulp layer and the upper and lower layers of coatings impregnated with starch in sizing press. See also patent application U.S. 2008/0035292, published on 14 February 2008, in which are disclosed the paper base having a high dimensional stability at high gluing surface and low internal sizing.

Calcium chloride currently use in inkjet media registration to improve the density of inkjet printing and drying time. See, for example, patent application U.S. 2007/0087138, opublikowano the April 19, 2007, in which is disclosed a recording sheet with improved drying time of the image, which contains soluble salts of divalent metals. In inkjet media registration using other metal salts. In U.S. patent 4,381,185 unfolded the paper, which contains multiply charged cations of metals. In U.S. patent 4,554,181 disclosed a recording sheet for inkjet printing, having a recording surface which contains a salt of polyvalent metal. In U.S. patent 6,162,328 disclosed gluing paper to the framework for inkjet printing, which comprises a cationic metal salts. In U.S. patent 6,207,258 disclosed a composition for treatment of the substrate surface for inkjet printing, which contains a salt of the divalent metal. In U.S. patent 6,880,928 disclosed paper registration framework for inkjet printing, having a coating that includes a salt of polyvalent metal. The authors of the present invention found that the use of calcium chloride can be problematic. High levels of calcium chloride can cause problems with passing in papermaking machines; calcium chloride suppresses undesirable optical Brightener based on stilbene, which is often used in the sizing press, and calcium chloride affects the pH of the compositions used in the size press. The starches used in the sizing press, t is about a narrow range of pH values, to be effective too high pH can lead to yellowing of starch; too low a pH can cause precipitation and gelation of the starch. Calcium chloride can also interact with other chemicals used in the wet end, when paper is shredded or processed.

Thus, there is a need for a recording sheet, which saves the improved density inkjet printing and other advantages, but which is devoid of the problems of participation and influence on the composition associated with the presence of calcium chloride.

DISCLOSURE of INVENTIONS

The above and other problems are solved by the present invention. Surprisingly, the authors of the present invention have found that the recording sheet containing at least one water-soluble salt of the divalent metal I-beam structure has significantly improved the amount of color coverage, density inkjet printing and a few other benefits mentioned in this document. These benefits are impossible to predict. Without being bound by theory we believe that the effective surface concentration of water-soluble salts of divalent metals increases with I-beam structure, and increased effective surface concentration in combination with the I-beam structure poses which enables you to reduce the total amount of additives in the recording sheet, without prejudice to its characteristics. Other benefits include reduced by the transfer of ink immediately after printing, a high density of the black image and improved sharpness of the edges of the image when printing with pigment inks.

One variant of implementation of the present invention preferably achieves equal or better the print density and drying time at much lower levels of metal salts. In one embodiment, the present invention uses a smaller amount of metal salt such as calcium chloride; achieved improved operating parameters of the papermaking machine, and wish you a reduced interaction with other chemicals in the manufacture of paper. Other advantages of the present invention are reduced by the amount of additives in the papermaking machine, which improves the operating parameters of the papermaking machine and reduces costs without compromising performance.

In another embodiment, the present invention found that the addition of surface pigments such as ground calcium carbonate (ICC), precipitated calcium carbonate (COC) and other, synergistically improves the amount of color coverage and drying time.

BRIEF DESCRIPTION of DRAWINGS

Various embodiments of the present invention is described in connection with the accompanying drawings, in which the s:

Figure 1 shows measured using an optical microscope penetration of starch in comparative and illustrative embodiments of the present invention.

Figure 2 shows measured using an optical microscope, the penetration of the starch in the I-beam structure to the illustrative embodiments in the examples.

Figure 3 is a graph showing the results of the color gamut for illustrative pigmented and non pigmented variants of implementation at different pressure contact zones loaded quantities of pigments and loaded quantities of salts of divalent metals.

4 is a graph showing the results of the color gamut for illustrative and comparative embodiments in the examples.

5 is a graph showing the average value of the color gamut on the y-axis for comparative and illustrative embodiments in the examples.

6 is a graph showing the average value of the color gamut on the y-axis for comparative and illustrative embodiments in the examples.

7 is a chart showing the average value of the color gamut on the y-axis for comparative and illustrative not pigmented embodiments in the examples.

Fig is a chart showing the average value of the color gamut of the axis is for comparative and illustrative containing the pigment of embodiments in the examples.

Fig.9 is a graph showing the mean density value of the black on the y-axis for comparative and illustrative containing and not containing the pigment of embodiments in the examples.

Figure 10 is a graph showing the mean density value of the black on the y-axis for comparative and illustrative containing and not containing the pigment of embodiments in the examples.

11 is a graph showing the mean density value of the black on the y-axis for comparative and illustrative containing and not containing the pigment of embodiments in the examples.

Fig is a chart showing the average value of the color gamut on the y-axis for comparative and illustrative containing and not containing the pigment of embodiments in the examples.

Fig is a chart showing the average value of the color gamut on the y-axis for comparative and illustrative containing and not containing the pigment of embodiments in the examples.

Fig - graph showing the mean density value of the black/density inkjet printing on the y-axis for comparative and illustrative containing and not containing the pigment of embodiments in the examples.

Fig - graph showing the mean density value of the black/density of paint on the y-axis for comparative and illustrative contains and does not contain Amigo pigment of embodiments in the examples.

DETAILED DESCRIPTION of SEVERAL embodiments

The authors of the present invention have found a way to achieve equal or superior density printing/drying time at a much more smaller quantities of additives, in some cases at levels of application (absorption = pounds per ton), which range from half to one third of volume commonly used in the sizing press. The authors of the present invention surprisingly found that the effective surface concentration of water-soluble salts of divalent metals, such as calcium chloride, may be maintained or increased by introducing containing salt glue in I-beam structure. It was also found that further addition of surface pigments, such as ICC, JCC, and other, synergistically improves the amount of color coverage and drying time.

The formation of I-beam structure is best done in the metered size press, such as a metering blade, usually with the use of compositions with high solids content, scrapers smaller volume control plucking and optimum pressure in the contact zone to prevent compression of the paper. This is a convenient method to control the application of adhesive and to maintain the integrity of the I-beam structure.

The high content of solid particles, Bo is its low absorption or increased viscosity of the size press composition allows you to change the pressure in the zones of contact with less impact.

The recording sheet may contain "effective amount" water-soluble salt of the divalent metal in contact with at least one surface of the base. Used herein, the term "effective amount" determines the number of which is sufficient for the formation of I-beam structure with a suitable adhesive substance or to improve the drying time of the image. This is the total amount of water-soluble salt of the divalent metal in the base may vary within wide limits, provided that maintained or achieved the desired I-beam structure. Usually this amount is at least 0.02 g/m2although you can use a lower or higher value. The amount of water-soluble salt of the divalent metal is preferably from about 0.04 g/m2up to 3 g/m2including all values and subranges between these values, including 0,04, 0,05, 0,06, 0,07, 0,08, 0,09, 0,1, 0,2, 0,3, 0,4, 0,5, 0,6, 0,7, 0,8, 0,9, 1, 1,5, 2, 2,5 and 3 g/m2or any combination, and most preferably from about 0.04 g/m2to 2.0 g/m2. In the best options for implementation of a number of water-soluble salt of the divalent metal is preferably from about 0.04 g/m2to 1.0 g/m2. When implementing the present invention into practice can the be used any water-soluble salt of the divalent metal. Suitable water-soluble salt of the divalent metal include, without limitation, compounds containing divalent calcium, magnesium, barium, zinc or any combination. Opposite ions (anions) can be simple or complex and can vary within wide limits. Examples of such materials are calcium chloride, magnesium chloride and calcium acetate. Preferred water-soluble salts of divalent metal for the practical implementation of the present invention are water-soluble calcium salts, especially calcium chloride. In one embodiment, the salt of the divalent metal may be a salt of a mineral or organic acid with a divalent metal cation or a combination thereof. In one embodiment, the water-soluble salt of the metal may include a halide, a nitrate, chlorate, perchlorate, sulfate, acetate, carboxylate, hydroxide, nitrite, etc. or their combinations with calcium, magnesium, barium, zinc (II), etc. or combinations thereof. Some examples of salts of divalent metals include, without limitation, calcium chloride, magnesium chloride, magnesium bromide, calcium bromide, barium chloride, calcium nitrate, magnesium nitrate, barium nitrate, calcium acetate, magnesium acetate, barium acetate, calcium acetate-magnesium, calcium propionate, magnesium propionate, barium propionate, calcium formate, 2-ativate is at calcium, the calcium nitrite, calcium hydroxide, zinc chloride, zinc acetate, and combinations thereof.

Possible mixture or combination of salts of divalent metals, different anions or both. The relative mass of the cation divalent metal salt of the divalent metal can be maximized with respect to the anion in the salt, in order to provide increased efficiency based on the total weight of salt applied. Therefore, for this reason, for example, calcium chloride is more preferable than calcium bromide. Equal characteristics of the print properties are expected when the paper contains the same dose of cations of divalent metal salts of divalent metals, expressed in moles.

In one embodiment, the salt of the divalent metal soluble in the amount used in aqueous compositions for sizing. In one embodiment, it is soluble at a pH of from about 6 to 9. The aqueous sizing medium may be in the form of an aqueous solution, emulsion, dispersion, latex, colloidal composition, and when used herein, the term "emulsion"in the usual meaning in the field, means or dispersion type liquid-in-liquid type or solid-in-liquid, as well as latex or colloidal composition.

In one embodiment, the solubility of the salt of divalent metal the water can vary from slightly or moderately soluble to soluble, measured on a saturated aqueous solution of salt of divalent metal at room temperature. The solubility in water may range from 0.01 mol/l and above. This range includes all values and subranges, including 0,01, 0,05, 0,1, 0,5, 1, 1,5, 2, 5, 7, 10, 15, 20, 25 mol/l and above. In one embodiment, the solubility of the salt of the divalent metal in water is 0.1 mol/l or higher.

The paper base contains a lot of cellulose fibers. The type of cellulose fibers is not critical, and you can use any fiber known or suitable for use in the manufacture of paper. For example, the base may be made of wood pulp fibers derived from hardwood trees, softwood trees, or a combination of deciduous and coniferous trees. Fibers can be prepared for use in compositions for making paper by one or more well-known operations of cooking, refining and/or bleaching, for example, the well-known mechanical, thermomechanical, chemical and/or Poluchenie and/or other well known methods of pulping. Used herein, the term "hardwood pulp includes the pulp obtained from wood pulp of deciduous trees (Metasperm plants), such as birch, oak, beech, maple and eucalyptus. Used C the ect term "softwood pulp includes fibrous mass, obtained from the pulp of coniferous trees (gymnosperms)such as various fir, spruce and pine trees, such as pine incense, Caribbean pine, prickly spruce, balsam fir and dupacova fir. In some embodiments, the implementation of at least part of the fibers of wood pulp can be produced from non-woody herbaceous plants, including, but without limitation, kenaf, hemp, jute, flax, sisal or abaku, although legal restrictions and other considerations may make the use of cannabis and other sources of fibers impractical or impossible. You can use bleached or unbleached fibers. Also you will want to use recycled fiber.

The paper base may contain from 1 to 99 wt.% cellulose fibers from the total mass basis. In one embodiment, the paper base may contain from 5 to 95 wt.% cellulose fibers from the total mass basis. These values include all values and subranges between them, for example, 1, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95 and 99 wt.%.

The paper base may optionally contain from 1 to 100 wt.% cellulose fibers from coniferous species from the total amount of cellulose fibers in a paper basis. In one embodiment, the paper base may contain from 0 to 60 wt.% cellulose fibers from deciduous species of owls the total amount of cellulose fibers in a paper basis. These values include 1, 2, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95 and 100 wt.% and all ranges and subranges in them from the total amount of cellulose fibers in a paper basis.

In one embodiment, the paper base may alternatively or perekryvaya contain from 0.01 to 99 wt.% fibers from deciduous species from the total weight of the paper base. In another embodiment, the paper base may contain from 10 to 60 wt.% fibers from deciduous species from the total weight of the paper base. These ranges include all values and subranges therein. For example, the paper base may contain not more than 0,01, 0,05, 0,1, 0,2, 0,5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85,90,95 and 99 wt.% coniferous fibres of the total weight of the paper base.

All or part of coniferous fibres can be obtained from coniferous species, having a canadian standard degree of grinding (CSF) from 300 to 750. In one embodiment, the paper base contains fibers from coniferous species with CSF from 400 to 550. These ranges include all values and subranges between them, for example, 300, 310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 410, 420, 430, 440, 450, 460, 470, 480, 490, 500, 510, 520, 530, 540, 550, 560, 570, 580, 590, 600, 610, 620, 630, 640, 650, 660, 670, 680, 690, 700, 710, 720, 730, 740 and 750 CSF. Canadian standard degree of grinding is measured by the standard TAPPI method T-227.

The paper base may select segergation 1 to 100 wt.% cellulose fibers from coniferous species of the total amount of cellulose fibers in a paper basis. In one embodiment, the paper base may contain from 30 to 90 wt.% cellulose fibers from coniferous species of the total amount of cellulose fibers in a paper basis. These ranges include 1, 2, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75. 80, 85, 90, 95 and 100 wt.% and all values and subranges in them from the total amount of cellulose fibers in a paper basis.

In one embodiment, the paper base may alternatively or perekryvaya contain from 0.01 to 99 wt.% fibers from deciduous species from the total weight of the paper base. In another embodiment, the paper base may alternatively or perekryvaya to contain from 60 to 90 wt.% fibers from deciduous species from the total weight of the paper base. These ranges include all values and subranges between them, including not more than 0,01, 0,05, 0,1, 0,2, 0,5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, and 99 wt.% of the total weight of the paper base.

All or part of the hardwood fibers may be obtained from deciduous species with the canadian standard degree of grinding from 300 to 750. In one embodiment, the paper base may contain fibers from deciduous species, with values of CSF from 400 to 550. These ranges include 300, 310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 410, 420, 430, 440, 450, 460, 470, 480, 490, 500, 510, 520, 530, 450, 550, 560, 570, 580, 590, 600, 610, 620, b 640, 650, 660, 670, 680,690, 700, 710, 720, 730, 740 and 750 CSF and all ranges and subranges therein. The paper base may optionally contain less refined fibers, for example, less refined softwood fibers, less refined hardwood fibers, or both. The possible combinations are less refined and more refined fibers. In one embodiment, the paper base contains fiber that is at least 2% less refined than the fibers used in traditional paper bases. This range includes all values and subranges between them, including at least 2, 5, 10, 15 and 20%. For example, if traditional paper contains fiber, coniferous and/or deciduous, having a Canadian standard degree of grinding 350, in one embodiment, the paper base may contain fibers having a CSF 385 (i.e. refined 10% less than the traditional, and still have characteristics similar to, if not better, than traditional paper. Non-limiting examples of some performance characteristics of the paper base is described below. Some examples of reductions in the processing of hardwood and/or softwood fibers include, but without limitation: 1) from 350 to at least 385 CSF; 2) from 350 to at least 400 CSF; 3) from 400 to at least 450 CSF and 4) from 450 to at least 500 CSF. In some embodiments, the implementation of the reduction in on what lavorazioni fibers may be at least 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 and 25% compared with the fibers in the traditional paper bases.

If the paper base contains hardwood and softwood fibers, the mass ratio can choose to range from 0.001 to 1000. In one embodiment, the ratio of deciduous/coniferous fibres can range from 90/10 to 30/60. These ranges include all values and subranges between them, including 0,001, 0,002, 0,005, 0,01, 0,02, 0,05, 0,1, 0,2, 0,5, 1, 2, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 200, 300, 400, 500, 600, 700, 800, 900 and 1000.

Softwood fibers, hardwood fibers, or both can be modified by physical and/or chemical methods. Examples of physical methods include, but without limitation, electromagnetic and mechanical methods. Examples of electrical modifications include, but without limitation, the ways in which the fibers are in contact with the source of electromagnetic energy, such as light and/or electric shock. Examples of mechanical modifications include, but without limitation, the ways in which contact with the fibers inanimate object. Examples of such inanimate objects include objects with sharp and/or blunt edges. Such methods include, for example, cutting, grinding, crushing, piercing, etc. and their combinations.

Non-limiting examples of chemical modifications on the Ute traditional methods of processing fibers, such as stapling and/or deposition of their complexes. Other examples of suitable modifications of fibers include the methods described in U.S. patents№6592717, 6592712, 6582557, 6579415, 6579414, 6506282, 6471824, 6361651, 6146494, N, 5731080, 5698688, 5698074, 5667637, 5662773, 5531728, 5443899, 5360420, 5266250, 5209953, 5160789, 5049235, 4986882, 4496427, 4431481, 4174417, 4166894, 4075136 and 4022965, the entire contents of which are incorporated herein by reference. Other examples of suitable modifications of fibers can be found in patent applications U.S. No. 60/654,712 dated February 19, 2005, and 11/358,543, dated 21 February 2006, which may include the addition of optical brighteners, as it is written, all the contents of which are incorporated herein by reference.

The paper base may optionally include a "trifle". Fiber "little things" are fibers, the average length of which does not exceed 100 microns. Sources of "stuff" can be fiber SaveAll, circulating flows, flows of marriage, threads rejected fibers and combinations thereof. The number of "little things"present in the paper base may be changed, for example, by adjusting the speed of adding threads in the paper production process. In one embodiment, the average length of fines does not exceed 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95 and 100 microns, including all ranges and subranges therein.

If they are used, the fibers of the "little things" can attended the ü in the paper along with hardwood fibers, softwood fibers, or both.

The paper base may optionally contain from 0.01 to 100 wt.% trivia of the total weight of the paper base. In one embodiment, the paper base may contain from 0.01 to 50 wt.% trivia of the total mass basis. These ranges include all values and subranges between them, including not more than 0,01, 0,05, 0,1, 0,2, 0,5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95 and 100 wt.% trivia of the total weight of the paper base.

In one embodiment, the paper base may alternatively or perekryvaya contain from 0.01 to 100 wt.% trivia of the total weight of the fibers in the paper substrate. This range includes all values and subranges between them, including not more than 0,01, 0,05, 0,1, 0,2, 0,5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95 and 100 wt.% trivia of the total weight of fibers in a paper basis.

The recording sheet contains at least one sizing agent, which interacts with a paper basis for the formation of I-beam structure. Because it contains at least one water-soluble salt of the divalent metal, a sizing substance virtually unlimited, and you can use any sizing substance used in the manufacture of paper. Sizing substance may be chemically active, hee is automatic inactive, or a combination of inactive and active. Sizing substance may choose to give a paper basis moisture or water in varying degrees. Non-limiting examples of sizing substances contained in the publication "Handbook of engineer-technologist of pulp and paper production (Handbook for Pulp and Paper Technologists)", G.A. Smook (1992), Angus Wilde Publications, which are incorporated herein in full by reference. Preferably, the sizing agent is a surface sizing agent. Preferred examples of the sizing substances are starch, dimer of alkylbetaine (AKD), the dimer of alkenylamine (ALKD), alchemistry anhydride (ASA), ASA/ALKD, styrene-acrylic emulsion (SAE), polyvinyl alcohol (PVOH), polyvinyliden, alginate, carboxymethyl cellulose, etc. But you can use any sizing agent. See, for example, a sizing agent, disclosed in U.S. patent No. 6,207,258, the entire contents of which are incorporated herein by reference. In this area there are many known chemical inactive sizing agent. Examples include, without limitation, chemically inactive polymer emulsion for gluing surface BASOPLAST® 335D, manufactured by BASF Corporation (mountain olive, new Jersey), an emulsion of a copolymer of vinyl acetate and butyl acrylate FLEXBOND® 325, manufactured by Air Products and Chemicals, Inc. (Trexlertown, Pennsylvania) and chemically inactive is receiveaudio substances PENTAPR1NT® (open, for example, in published international patent application WO No. 97/45590, published on 4 December 1997, the corresponding patent application U.S. serial number 08/861,925, filed may 22, 1997, the entire contents of which are incorporated herein by reference), on behalf of Hercules Incorporated (Wilmington, Delaware).

For the manufacture of paper under alkaline conditions of production, you can use a sizing agent on the basis of dimers of alkylbetaine (AKD) or dimers of alkenylamine (ALKD) or multimers and alkenylamine anhydride (ASA). You can also use combinations of these and other sizing agents. The ketene dimer as a sizing agent for paper production are well known. AKD containing one P-lactonase ring, usually obtained by the reaction of alkylbetaine, made of two chlorides of fatty acids. Commercial sizing agent-based dimers of alkylbetaine often derived from palmitic and/or stearic fatty acids, for example, a sizing agent Neeap® and Aquapel® (both from Hercules Incorporated).

A sizing agent on the basis of dimers of alkenylamine also commercially available, for example, a sizing agent Precis® (Hercules Incorporated).

In U.S. patent No. 4,017,431, the entire contents of which are incorporated herein by reference, shows a non-limiting illustrative disclosure sizing substances AD mixed with wax and water-soluble cationic resins.

As a sizing agent you can also use multimer of ketene containing more than one p-lactoovo rings.

A sizing agent obtained from a mixture of mono - and dicarboxylic acids are disclosed as a sizing agent for paper, not examined patent applications Japan No. 168991/89 and 168992/89.

In the published European patent application No. 0629741 A1 disclosed dimer and a mixture of multimers of alkylbetaine as a sizing agent for paper used in high-speed machines for processing, treatment and reprography. Multimer of alkylbetaine obtained by the reaction of the monocarboxylic acid with a molar excess, usually fatty acids with dicarboxylic acid. These multimeric compounds harden at 25°C.

In the published European patent application No. 0666368 A2 and in U.S. patent No. 5,685,815 (Bottorff and others), the entire contents of which are incorporated herein by reference, disclosed a paper for high-speed or reprographic operations dimer and/or multibeam of alkenylamine as a sizing agent, which inside is coated with alkyl or a sizing agent. Preferred 2-oxetanone multimer obtained when the relationship fatty acids with dikilitas in the range from 1:1 to 3.5:1.

Commercial sizing agent based on the ASA are dispersions or emulsions material is, which can be obtained by the reaction of maleic anhydride with olefin (C14-C18).

Examples of hydrophobic acid anhydrides used as a sizing agent for paper, include:

(i) an anhydride resin acids (see U.S. patent No. 3,582,464, the entire contents of which are incorporated herein by reference);

(ii) anhydrides having the structure (I):

where each R is the same or different hydrocarbon radical; and

(iii) cyclic anhydrides of dicarboxylic acids having the structure (II):

where R' is the radical of dimethylene or trimethylene, and R" is a hydrocarbon radical. Some examples of anhydrides of formula (I) include myristoleic anhydride, politology anhydride, oleography anhydride and stearilovy anhydride. Examples of substituted cyclic anhydrides of dicarboxylic acids falling under formula (II)are substituted succinic and glutaric anhydrides, i - and n-octadecylamine anhydride; i - and n-hexadecanesulfonyl anhydride; i - and n-tetradecyl succinic anhydride, domiciliary anhydride; detailentry anhydride; actinistia anhydride and getinputvalue anhydride.

Other examples of chemically inactive sizing substances include polymer emulsion, the emulsion of the cationic polymer emulsion impoter the second polymer, the emulsion polymer in which at least one monomer selected from the group including styrene, a-methylsterol, acrylate with essential assistant 1-13 carbon atoms, methacrylate with ether assistant 1-13 carbon atoms, Acrylonitrile, Methacrylonitrile, vinyl acetate, ethylene and butadiene; and optionally comprising acrylic acid, methacrylic acid, maleic anhydride, esters of maleic anhydride or mixtures thereof, with an acid number of less than 80, and mixtures thereof. Optionally, the polymer emulsion can be stabilized stabilizing substance, preferably including degraded starch, such as disclosed, for example, in U.S. patent No. 4,835,212, 4,855,343 and 5,358,998, the entire contents of each of which are incorporated herein by reference. Optionally, you can use a polymer emulsion in which the polymer has a glass transition temperature from -15°C to 50°C.

For traditional conditions of production of paper with acidic pH can be used chemically inactive sizing agent in the form of dispersed resin sizing agents. Dispersed resin sizing agent is well known. Non-limiting examples of the resin sizing substances are disclosed, for example, in U.S. patent No. 3,966,654 and 4,263,182, the entire contents of each of which are incorporated herein by reference.

Resin m which may be modified or unmodified, dispersible or emulsifiable resin, suitable for paper sizing, including non-amplified resin, reinforced resin and an expanded resin and resin esters, and mixtures thereof. Used herein, the term "resin" refers to any of these forms dispersed resin suitable as a sizing agent.

Resin in dispersed form are not specifically limited, and you can use any of the commercially available types of resin, such as wood resin, gum rosin, resin taly oils and mixtures of any two or more resins in their crude or refined state. In one embodiment, uses tall oil resin and gum rosin. You can also use partially hydrogenated resin and primaryservername resin, and resin-treated for inhibition of crystallization, for example, heat treatment or reaction with formaldehyde.

Reinforced resin is not specifically limited. One example of such a resin is the product of the joining reaction between resin and an acidic compound containing the group

and obtained by reaction of the resin and the acidic compound at elevated temperatures from 150°C to 210°C.

The amount used of the acid compounds to be such, which will provide enhanced resin containing from about 1 is about 16 wt.% attached acidic compounds from mass-reinforced resin. Methods of obtaining enhanced resin is well known to specialists in this field. See, for example, the methods disclosed in U.S. patent No. 2,628,918 and 2,684,300, the entire contents of each of which are incorporated herein by reference. Examples of acidic compounds containing the group

which can be used to obtain enhanced resins include α-β-unsaturated organic acids and their anhydrides, specific examples of which include fumaric acid, maleic acid, acrylic acid, maleic anhydride, taconova acid, itacademy anhydride, citraconate acid and citraconic anhydride. The desire to obtain a reinforced resin, you can use a mixture of acids.

So, for example, a mixture of the product of the merger of acrylic acid resin and the product of the joining of fumaric acid can be used to obtain a sizing agent in the form of dispersed resin. You can also use a reinforced resin, which is in essence completely hydrogenation after the formation of the product of the merger.

Resin esters can also be used in sizing substances in the form of dispersed resin. Examples of suitable resin esters can be esterified resin as described in U.S. patent No. 4,540,635 (Rong and others) and No. 5,201,94 (Nakata and others), the entire contents of each of which are incorporated herein by reference.

No amplified or reinforced resin or rosin esters can be optionally expanded the known fillers, such as waxes (in particular, paraffin wax and microcrystalline wax), hydrocarbon resins, including derived from petroleum hydrocarbons and terpenes etc. This can be achieved by melt mixing or by mixing the solution with a resin or reinforced resin is from 10 to 100 wt.% filler by weight of the resin or reinforced resin.

You can use a mixture of reinforced resin and the non-amplified resin, a mixture of reinforced resin, the non-amplified resins, resin esters and filler. A mixture of enhanced and non-amplified resin may include, for example, from 25% to 95% reinforced resin and from 75% to 5% non-amplified resin. A mixture of reinforced resin, the non-amplified resin and filler may include, for example, from 5% to 45% reinforced resin, from 0 to 50% non-amplified resin and from 5% to 90% filler.

Also as sizing agents can be used hydrophobic organic isocyanates, such as alkylated isocyanates. Other conventional sizing agent for paper include allylcarbamate-chlorides, alkylated melamine, such as sterilizovannye the melamine, styrene-acrylates.

Possible mixture of sizing agents./p>

You can use external sizing substance, or both internal and surface sizing agent. If both are used, they may be present in any mass ratio and can be identical or different. In one embodiment, the mass ratio of the surface sizing agent with the internal sizing substance is from 50/50 to 100/0, more preferably from 75/25 to 100/0 surface/internal sizing agent. This range includes 50/50, 55/45, 60/40, 65/35, 70/30, 75/25, 80/20, 85/15, 90/10, 95/5 and 100/0, including all ranges and subranges therein. A preferred example of the internal sizing agent is alchemistry anhydride (ASA).

When using starch as a sizing agent, the starch may be modified or unmodified. Examples of the starch can be found in the "Handbook of engineer-technologist of pulp and paper production", G.A. Smook (1992), Angus Wilde Publications mentioned above. Preferred examples of modified starches include, for example, oxidized, cationic, leaded, hydroelectrically etc. in Addition, the starch may be from any source, preferably from potato and/or corn. Most preferably, the source of starch is corn.

In one embodiment, the mixture, the soda is containing calcium chloride and one or more starches, is in contact with at least one surface of the base. Examples of starches include naturally occurring carbohydrates synthesized in corn, tapioca, potato and other plants by polymerization of dextrose units. You can use all these starches and their modified forms, such as starch acetates, esters of starch ethers, starch, phosphate starch, xanthate starches, anionic starches, cationic starches, oxidized starches, etc. that can be obtained by reaction of starch with a suitable chemical or enzymatic reagent. Optionally, the starch can be obtained by known methods or purchased. For example, commercially available starches include Ethylex 2035 from A.E. Staley, PG-280 from Penford Products, oxidized corn starches from ADM, Cargill and Raisio and enzyme converted starches, such as Amyzet 150 from Amylum.

You can use modified starches. Non-limiting examples of modified starches include cationic chemically modified starches, such as leaded, oxidized, and maize and enzyme converted starches Pearl. Most preferred are chemically modified starches, such as leaded, oxidized, and maize and enzyme converted starches Pearl.

In one embodiment, soluble in water the salt of the metal, for example, calcium chloride and starch Ethylex 2035 is used in a sizing composition deposited on both sides of a sheet of paper, and have improved the drying time sheet, if the mass ratio of calcium chloride with starch is equal to or greater than 0.5 to 20%. This range includes all values and subranges between them, including 0,5, 0,6, 0,7, 0,8, 0,9, 1, 1,5, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 and 20%, and any combination of them. In one embodiment, the mass ratio of calcium chloride with the starch may be from 0.5 to 18%. In another embodiment, the mass ratio may range from 0.75%to 17%. In another embodiment, the mass ratio may be from 1% to 16%. The mass ratio of calcium chloride with starch may be half from the above, if the mixture of starch/salt put only on one side of the paper, and starch without salt put on the other side. In this case, the superior properties when printing can be expected only on the side of the paper containing salt.

The amount of water-soluble salt of the divalent metal and one or more starches in the base and/or base can vary widely, and you can use any traditional number. One advantage of the invention lies in the fact that you can use a reduced amount of sizing prophetic is TBA and/or water-soluble salt of the divalent metal. In one embodiment, the amount of water-soluble salt of the divalent metal and/or on the basis of at least 0.02 g/m2the recording sheet, although you can use larger and fewer. The number is preferably at least 0.03 g/m, more preferably at least 0.04 g/m2and most preferably from about 0.04 g/m2to 3.0 g/m2. These preferred ranges include all values and subranges between them, including 0,02, 0,03, 0,04, 0,05, 0,06, 0,07, 0,08, 0,09. 0,1, 0,2, 0,3, 0,4, 0,5, 0,6, 0,7, 0,8, 0,9, 1,0, 1,2, 1,4, 1,6, 1,8, 2,0, 2,2, 2,4, 2,6, 2,8 and 3.0 g/m2and any combination of them.

If the sizing agent is used polyvinyl alcohol, it may have any percentage of hydrolysis. Preferred polyvinyl alcohols are having a percent hydrolysis from 100% to 75%. The percentage of hydrolysis of the polyvinyl alcohol may be 75, 76, 78, 80, 82, 84, 85, 86, 88, 90, 92, 94, 95, 96, 98 and 100%, including all ranges and subranges therein.

The paper base may contain PVOH in either wt.%. Preferably, in the presence of polyvinyl alcohol is present in amounts of from 0.001 wt.% to 100 wt.% of the total weight of sizing agent contained in and/or on the base. This range includes 0,001, 0,002, 0,005, 0,006. 0,008, 0,01, 0,02, 0,03, 0,04, 0,05, 0,1, 0,2, 0,4, 0,5, 0,6, 0,7, 0,8, 0,9, 1, 2, 4, 5, 6, 8, 10, 12, 14, 15, 16, 18, 2, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95 and 100 wt.% of the total weight of sizing agent in the basis, including all ranges and subranges therein.

Sizing substance may also include one or more additives of choice, such as binders, pigments, thickeners, antifoaming substances, surface-active substances, substances that facilitate slippage, dispersing agents, optical brighteners, dyes and preservatives, which are well known. Examples of pigments include, but without limitation, clay, calcium carbonate, hemihydrate calcium sulphate and dehydrate calcium sulphate, chalk, ICC, JCC, and other Preferred pigment is calcium carbonate in the preferred form of precipitated calcium carbonate. Examples of the binder include, but without limitation, polyvinyl alcohol, Amres (Qimen), Bayer Parez, polychloride emulsion, modified starch, such as hydroxyethyloxy starch, starch, polyacrylamide, modified polyacrylamide, polyol, the product of the joining of the carbonyl to the polyol, the condensate of arandela/polyol, Polyamid, epichlorhydrin, glyoxal, localmachine, ethandiol, aliphatic polyisocyanate, isocyanate, 1,6-hexamethylene diisocyanate, diisocyanate, polyisocyanate, polyester, polyester resin, polyacrylate, polyacrylate resin, acrylate and methacrylate. Other optional additives in luchot, but without limitation, silicon dioxide in the form of colloidal solutions and/or colloidal solution. Examples of silica include, but are not limited to, sodium silicate and/or borosilicate. Other additives may be one or more solvents, for example water. The possible combinations of additives.

Most of the total amount of sizing agent is preferably on the outer surface or surfaces (if the sizing is applied on both surfaces) of the paper base or near them. The paper base of the present invention contains a sizing substance, so they (base and a sizing substance) interact for the formation of the I-beam structure. In this regard, you do not want a sizing substance penetrated into the pulp fiber framework and Vice versa. However, the mutual penetration of the coating layer and the cellulose fibers will received a paper base having a layer of mutual penetration, which is included in the scope of the present invention.

A layer of mutual penetration of the paper base defines a region in which at least a sizing solution penetrates into the cellulose fibers and is distributed among them. A layer of mutual penetration can range from 1 to 99% of the cross-section of at least part of the paper base, including 1, 2, 5, 10, 15, 20. 25, 30, 35, 40, 45, 50, 5, 60, 65, 70, 75, 80, 85, 90, 95 and 99% of the paper base, including all ranges and subranges therein. Such an implementation option can be implemented, for example, when a sizing solution is added to the pulp fibers before applying the coating, and if necessary it can be combined with a subsequent coating. Where to add can be, for example, in the sizing press.

Preferably, the layer thickness of mutual penetration in the cross section of minimize. Alternative or additionally, the concentration of the sizing agent is preferably increased in the transition (in the z-direction, perpendicular to the plane of the base) from the inner part to the surface of the paper base. Therefore, the amount of sizing agent in the upper and/or lower outer surfaces of the bases preferably greater amount of sizing agent into the inside of the middle of the paper base. Alternatively, a higher percentage sizing agent may preferably be located at some distance on the outer surface of the substrate equal to or less than 25%, more preferably 10%, of the full thickness of the base. This aspect can also be known as Qtotai, which is measured by known methods described, for example, in patent publication U.S. No. 2008/0035292 on February 14, 2008, the entire contents of which is turned into this document by reference. If Qtotai equal to 0.5, then a sizing substance approximately evenly distributed in a paper basis. If Qtotai greater than 0.5, then a sizing agent more in the direction of the Central part (in the z-direction, perpendicular to the plane of the surface) of the paper base than towards the surface or surfaces of the paper base. If Qtotalless than 0.5, then a sizing agent less in the direction of the Central part of the paper base than towards the surface or surfaces of the paper base. In light of the above, the paper base preferably has a Qtotalless than 0.5, preferably less than 0.4, more preferably less than 0.3, most preferably less than 0.25. Accordingly, Qtotalthe paper base may be from 0 to less than 0.5. This range includes 0, 0,001, 0,002, 0,005, 0,01, 0,02, 0,05, 0,1, 0,15, 0,2, 0,25, 0,3, 0,35, 0,4, 0,45 and 0.49, including all ranges and subranges therein.

As mentioned above, the definition of Q can be performed according to the procedure described in patent publication U.S. No. 2008/0035292 on February 14, 2008

In fact, Q is a measure of the amount of sizing agent in the transition from the outer edges to the middle of the sheet in cross section. It is understood that Q can be any, when it is increased the ability to have a sizing substance towards the outer surface is she cross-section of the sheet, and Q can be selected (using any validation) to provide for any one or more of the above and the following characteristics of the paper base (e.g., internal communication, gyroresonant, resistance to picking and/or resistance to plucking/bundle etc).

Of course, there are other ways of measuring the value of Q. In one embodiment, acceptable any dimension Q or a similar method of measuring the ratio of a sizing agent to the middle of the base with the amount of sizing agent to the outer surface or surfaces of the substrate. In the preferred embodiment, this ratio is such that the maximum amount of a sizing agent is in the direction of the outer surfaces of the base, thereby minimizing the area of mutual penetration and/or minimizing the amount of sizing agent in the layer of mutual penetration. It is also preferable that the distribution of the sizing agent was even at very high loads sizing agent, preferably external download a sizing agent in and/or on the canvas. Thus, it is desirable to control the amount of sizing agent in the layer of mutual penetration, if the surface load more and more external p is fining substances, by or minimize the concentration of sizing agent in the layer of mutual penetration of, or by reducing the thickness of mutual penetration. In one embodiment, characteristics of the recording sheet and/or paper substrate of the present invention such that can be achieved with this control sizing agent. Although this controlled load sizing agent may occur in any manner, it is preferable that a size of the substance is loaded or put in a sizing press.

Another example of a method of measuring the amount of sizing agent in the transition from the outer edges to the middle of the sheet in the cross section is contained in Example 10, where the paper sheet is separated and measured the amount of sizing agent in each part of the sheet.

Regardless of the method of measuring the amount of sizing agent in the transition from the outer edges to the middle of the sheet in cross-section, one alternative implementation is that the sizing substance is a salt of divalent metal, which has an effective concentration at a distance which is up to 25% of at least one surface of the substrate, and at least a majority, preferably 75%, most preferably 100% of the total salt concentration dvukhvalentnogo the metal is located at a distance of up to 25% of at least one surface of the substrate, moreover, the effective concentration of the salt of divalent metal gives black optical density of at least 1,15. In this embodiment, the effective concentration of the salt of the divalent metal may be at least 2500 ppm, preferably at least 6000 ppm, most preferably at least 12,000 parts per million.

Effective salt concentration of the divalent metal may be at a distance of up to 25%, 20%, 15%, 10% and 5% of at least one surface of the base, including all ranges and subranges within these limits.

At least 51%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% and 100% of the total salt concentration of the divalent metal is at a distance of up to 25% of at least one surface of the base, including all ranges and subranges within these limits.

The effective concentration of the ion of the divalent metal is such that it gives the optical density of the black (as above) at least 1,0, 1,1, 1,15, 1,2, 1,25, 1,3,1,35, 1,4, 1,45, 1,5 and 1.6, including all ranges and subranges within these limits.

The effective concentration may be any, including 2500, 3000, 3500, 4000, 4500, 5000, 5500, 6000, 6500,7000, 7500, 8000, 8500, 9000, 9500, 10000, 10500, 11000, 11500 and 12000 ppm ion of the divalent metal, including all ranges and subranges within these limits.

The recording sheet can be obtained which houtem contact a sizing agent with the cellulose fibers of the paper base. The contact may occur at acceptable levels of concentration of the sizing agent and/or other additives.

I-beam structure are a result of selective placement and strict control of the location of the sizing agent in and/or on a paper basis. I-structure and operational characteristics described in patent publication U.S. No. 2004/0065423 on April 8, 2004, which is incorporated herein in full by reference. The average expert in the art can easily determine, communicate whether a sizing agent and paper basis for the formation of I-beam structure, with regard to this document. For example, marking the recording sheet iodine and having marked the sheet under an optical microscope, it is easy to determine if h-structure. The recording sheet of the present application can be produced by contact of the substrate with internal and/or surface sizing solution or composition comprising at least one sizing agent. The contact may take place at any time in the paper manufacturing process, including, but without limitation, wet side, headbox, in the size press, a water tank and/or installation for coating. Other additions include tank cars, otsasyvauschie and the pump inlet of the fan. Cellulose fiber sizing agent and/or additional components may be introduced into contact sequentially and/or simultaneously in any combination with each other. Most preferably, the paper base is in contact with a sizing composition in the sizing press.

The paper base may be omitted through the size press, where appropriate, any sizing means well known in the manufacture of paper, if it can be obtained I-beam structure. The size press, for example, can have a bath (for example, inclined, vertical, horizontal) or to have a dispenser (e.g., squeegee, scraper). Preferably, the size press has a spout.

For the preparation of compositions for size press one or more water-soluble salts of divalent metals can be mixed with one or more sizing agents, such as starches, and one or more optional additives can be dissolved or dispersed in a suitable liquid medium, preferably water, and applied to the canvas.

For example, the composition for size press may be applied in conventional size press equipment, including vertical, horizontal or inclined size press used in the manufacture of paper, such as equipment Symsizer (Valmet), glue the local press KRK (Kumagai Riki Kogyo Co., Ltd., Nerima, Tokyo, Japan) for coating by immersion. KRK size press is laboratory press, which simulates industrial size press. This press is used with a supply of sheets, whereas in industrial sizing press typically use continuous canvas.

The amount of water-soluble salt of the divalent metal is not specifically limited. In one embodiment, in which a sizing substance is applied on both sides of a sheet of paper, the number ranges from 8 to 165, including 8-33, of moles of cations per tonne of paper for paper having a base weight of 75 g/m2. This range includes all values and subranges between them, including 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 35, 37, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150, 155, 160 and 165 of moles of cations per tonne of paper. This range equals the range from 2.5 to 165, including a 2.5-33, of moles of cations per tonne of paper for paper having a basic weight of 250 g/m2. This range includes all values and subranges between them, including 2, 5, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 35, 37, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150, 155, 160 and 165 of moles of cations per tonne of paper. Here moles of cations mean moles of divalent cationic metals in salt form, solution, etc. or a combination of both./p>

In one embodiment, conditions interoperability sizing agent and paper base for the formation of I-beam structure is designed to capture in a dry condition from 30 to 150 pounds of starch per ton of paper when the number of solids 12-50% in the composition for size press. Here the number of pounds per ton calculated for a paper with a base weight of 75 g/m2.

The above range of the amount of starch includes all values and subranges between them, including 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145 and £ 150 per tonne. Here the number of pounds per ton calculated for a paper with a base weight of 75 g/m2.

You must understand that the number of pounds per ton and moles per tonne may vary in a known manner depending on the base weight of the paper, and the present invention is not limited to paper with a base weight of 75 g/m2.

In one embodiment, in which the water-soluble salt of the divalent metal is calcium chloride and in which a sizing substance is present on both sides of a sheet of paper, the number ranges from 2 to 8 pounds CaCl2per tonne of paper with a base weight of 75 g/m2. This range includes all values and subranges between them, including 2, 3, 4, 5, 6, 7 and 8 pounds CaCl2per tonne shall Umaga. This range equals the range from 0.6 to 8 pounds CaCl2per tonne of paper with a base weight of 250 g/m2. This range includes all values and subranges within these limits, including 0,6, 1, 2, 3, 4, 5 6, 7, and 8 pounds CaCl2per tonne of paper.

In one embodiment, the percentage of solids in the composition for size press may vary at least from 12 to 50%. This range includes all values and subranges within these limits, including 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 30, 35, 40, 45 and 50%.

In one embodiment, the capture of a sizing agent in a dry state can be from 0.25 to 6 g/m2including all values and subranges within these limits, for example, 0,25, 0,3, 0,4, 0,5, 0,6, 0,7, 0,8, 0,9, 1, 2, 3, 4 5, and 6 g/m2and any combination of them.

In one embodiment, the thickness of the wet film is adjusted for a proper grip. For example, in one embodiment, the thickness of the wet film may range from a value greater than zero to 40 μm. This range includes all values and subranges between them, including a value greater than zero, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 16, 17, 18, 19, 20, 25, 30, 35 and 40 microns. In one embodiment, the thickness of the wet film is from 10 to 30 μm. In one embodiment, the thickness of the wet film is from 15 to 25 microns.

In one embodiment, the amount of pigment in pasted the EBM media (in the sizing composition may comprise from 10 to 80 pounds per ton. This range includes all values and subranges between them, including 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 24, 26, 28, 30, 35, 40, 45, 50, 55, 60, 65, 60, 75 and 80 pounds per ton. Here the number of pounds per ton calculated for the base weight bond paper 20# (75 g/m2).

In one embodiment, the temperature in the sizing press can be from 100 to 300°F. This range includes all values and subranges within these limits, including 100,110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290 and 300°F.

In one embodiment, is used in the size press with a metering blade. In this embodiment, the amount of suitable scraper may be from 0,000864 square inches per inch to 0,001637 square inches per inch. This range includes all values and subranges within these limits, including 0,000865, 0,00087, 0,0009, 0,0010, 0,0015 and 0,001637 square inches per inch.

Upon contact of the pulp fibers with the composition for size press in the sizing press, it is preferable that the viscosity of the sizing solution ranged from 50 to 500 centipoise at Brookfield viscometer, spindle No. 2, at 100 rpm and 150°F. These ranges include all values and subranges within these limits, including 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 125, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 325, 350, 375, 400, 425 and 450 centipoise at Brookfield viscometer, spindle No. 2, at 100 rpm and 150°F, VK is UCA all ranges and subranges within these limits. In one embodiment, the viscosity is from 50 to 350 centipoise. In another embodiment, the viscosity is from 100 to 500 centipoise.

The paper base may be compressed in the press section with one or more pressure zones. You can use any pressing means, known in the field of paper production. Pressure area may include, but without limitation, zone one felt, two Fermi, shaft and extended pressure zone in the presses. When a sizing solution containing a sizing substance comes into contact with the fibers in the sizing press for the manufacture of the paper base, the effective pressure in the pressure zone is not specifically limited as long as the integrity of the I-beam structure. For example, the pressure may range from a value greater than zero up to 80 kN/m This range includes all values and subranges within these limits, including value is greater than zero, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70 and 80 kN/m, including all ranges and subranges within these limits. In one embodiment, the pressure is from 30 to 80 kN/m

The width of the zone pressure is not specifically limited and may range from a value greater than zero to 40 mm, This range includes all values and subranges within these limits, including value is greater than zero, 1, 2, 3, 4, 5. 6, 7, 8, 9, 10, 15, 16, 17, 18, 19, 20, 25, 30, 35 and 40 mm In one is ariante implementation of the width of the zone pressure is from 15 to 30 mm

Shaft size press may be apparent hardness Pusi and Jones, preferably any apparent hardness Pusi and Jones. Since the two shafts, the first shaft may have a first hardness, and the second shaft may have a second hardness. The hardness of the shaft may range from 0 to 30 the apparent hardness of the Puxi and Jones. This range includes all values and subranges within these limits, including 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 and 30 the apparent hardness of the Puxi and Jones. If you are using two shafts, they may be the same or different hardness. The first hardness and the second hardness may be the same or different. As an example, the apparent hardness of Puxi and Jones first shaft in a sizing press can be from 0 to 30, and apparent hardness Pusi and Jones second shaft can be from 0 to 30.

In one embodiment, conditions in the sizing press, the following: solids 12-50%, the temperature of 140-160°F, the viscosity of 50-350 CP, dry grip size press composition from 0.25 to 10 g/m2and the wet film thickness suitable for the desired grip.

In another embodiment, conditions in the sizing press, the following: solids 12-50%, the temperature of 140-160°F, the viscosity of 100-500 CP, dry grip compositions for size press from 0.25 to 10 g/m2and the thickness of the wet film is suitable for the target is the NAP.

The paper base may be dried in the drying section. You can use any drying means, well known in the field of paper production. The drying section may include a clothes dryer, the drying cylinder, the device Condebelt, infrared device or other drying means and mechanisms known in this field. The paper base may be dried until the content of any selected amount of water. Preferably, the base is dried to a content of less than or equal to 10% of water.

The paper base may be calendered by any known kalendarium means known in the field of paper production. More specifically, it is possible to use, for example, wet calendering, dry calendering, calendering in a steel pressure zones, hot soft calendering or calendering in the extended zones.

The paper base may have microfinishing finish by any method commonly known in the field of paper production. Microfilaria usually finish includes methods of finishing the surfaces of the paper base. The paper base may have microfinishing finish calendering or without applied sequentially and/or simultaneously. Examples of ways microfinishing finishes can be found in the patent publication U.S. No. 2004/0123966 and mentioned in her reference materials that su is incorporated herein in full by reference.

In one embodiment, the paper base containing a sizing substance, may be additionally covered with a layer of coating with use of the application, including the means of impregnation. The preferred method of applying the coating layer is continuous way in one or more positions. Posts coating may be any means for coating, well-known in the field of paper production, including, for example, brush, blade, air knife, spraying, curtain, rod, gear shaft, reverse shaft and/or the means for injection molding application, and any combination of them.

Next, the coated base paper can be dried in the drying section. You can use any drying means, well known in the field of paper production and/or coatings. The drying section may contain infrared means, a drying device, forcing air and/or heated steam drying drums or other drying means and mechanisms known in the field of coating.

Further, the base coating can be subjected to finishing by any means well known in the field of paper production. Examples of such finishing means including one or more finishing positions include calender, supercalender and/or a calender with the increased pressure zone.

Paper-based and/or reg is strenuously sheet can be added in any traditional way of manufacturing or converting paper, including sanding, scraping, cutting, roughened, perforation, arcing, calendering, finishing the worksheet, converting, coating, laminating, printing, etc. Preferred traditional processes configured to include the production of paper basics that you can use as paper products coated with, or without, cardboard and/or foundations. See the books listed in the "Handbook of engineer-technologist of pulp and paper production", G.A. Smook (1992), Angus Wilde Publications, which are incorporated herein in full by reference.

Recording sheet and/or the paper base may also include one or more optional substances, such as means of restraint, binders, fillers, thickeners and preservatives. Examples of fillers (some of which can also function as pigments, above) include, but without limitation, clay, calcium carbonate, hemihydrate calcium sulphate and dehydrate calcium sulphate, chalk, ICC, JCC, and other Examples of the binder include, but without limitation, polyvinyl alcohol, Amres (Qimen), Bayer Parez, polychloride emulsion, modified starch, such as hydroxyethyloxy starch, starch, polyacrylamide, modified polyacrylamide, a polyol, the product of the joining of the carbonyl to the polyol, the condensate of arandela/poly is La, polyamide, epichlorohydrin, glyoxal, pixelmachine, ethandiol, aliphatic polyisocyanate, isocyanate, 1,6-gestalterischen, diisocyanate, polyisocyanate, polyester, polyester resin, polyacrylate, polyacrylate resin, acrylate and methacrylate. Other optional substances include, but are not limited to, silica, such as colloidal solutions and/or sols. Examples of silica include, but are not limited to, sodium silicate and/or borosilicate. Another example of optional substances are solvents, including but without limitation, water. The possible combinations of optional substances.

The recording sheet of the present invention may contain from 0.001 to 20 wt.% optional substances from total mass basis, preferably from 0.01 to 10 wt.%, most preferably from 0.1 to 5.0 wt.%, at least one of the optional substances. This range includes 0,001, 0,002, 0,005, 0,006, 0,008, 0,01, 0,02, 0,03, 0,04, 0,05, 0,1, 0,2, 0,4, 0,5, 0,6, 0,7, 0,8, 0,9, 1, 2, 4, 5, 6, 8, 10, 12, 14, 15, 16, 18 and 20 wt.% from the total mass basis, including all ranges and subranges within these limits.

Other conventional additives which may be present include, but without limitation, wet-strength resins, internal adhesives, shopruche resin, alum, fillers, pigments and dyes. The base may contain substances that adds volume, such as EXT is represented microspheres, wood fiber and/or diamine salt.

The paper base or sizing material may optionally contain a substance that adds volume, in any amount from 0.25 to 50 pounds of dry matter per tonne of end bases, preferably from 5 to 20 pounds of dry matter per tonne of final product, when such means provide volume is additive. This range includes 0,25, 0,5, 0,75, 1,0, 2,0, 2,5, 3,0, 3,5, 4, 4,5, 5, 5,5. 6, 6,5, 7, 7,5, 8, 8,5, 9, 9,5, 10, 11, 12, 13, 14, 15, 20, 25, 30, 35, 40, 45 and 50 pounds of dry matter per tonne of final product, including all ranges and subranges within these limits.

Substance that adds volume, can be expandable microsphere, the composition and/or particle to give the volume of paper products and foundations. However, you can use any giving amount of substance, although expandable microsphere, composition, particle and/or the thus obtained paper basis is the preferred tool to add volume. Other alternative materials to add volume to include, but without limitation, surfactants, Reactopaque, pre-expanded spheres, STMR (bleached chemi-thermomechanical pulp), microfilaria processing and multi-layered design to build an I-beam effect in a base of paper or cardboard. Such substances, adds volume, can, after the introduction in the paper or on the Eseniya on it to ensure proper print quality, the thickness of the base mass, etc. in the absence of hard calendering conditions (i.e., the pressure in one zone and/or pressure in a smaller number of zones in the calender) and at the same time to create a paper basis, with one, some or a combination of physical and operational characteristics mentioned in this document.

In one embodiment, the paper base may contain from 0.001 to 10 wt.%, preferably from 0.02 to 5 wt.%, more preferably from 0.025 to 2 wt.%, most preferably from 0.125 to 0.5 wt.% expandable microspheres of the total mass basis.

Examples of expandable microspheres having the ability to increase the amount described in patent application U.S. No. 60/660,703, filed March 11, 2005, and patent application U.S. No. 11/374,239, filed on March 13, 2006, which are incorporated herein in full by reference. Other examples include the examples of U.S. patent No. 6,379,497, issued may 19, 1999, and in patent publication U.S. No. 2006/0102307, filed June 1, 2004, which are incorporated herein in full by reference.

Some examples of adds volume fibers include, but without limitation, mechanical fibers, such as ground wood pulp, STMR and other mechanical and/or polymechanics wood pulp.

Adding such wood mass in an amount of from 0.25 to 75 wt.%, predpochtitelno less than 60 wt.%, from the total mass of the used fibers they can be like giving the volume of fibers.

Examples diamedix salts include described in patent publication U.S. No. 2004/0065423, filed September 15, 2003, which is incorporated herein in full by reference. Non-limiting examples of such salts include mono - and distearate of animositisomina that can be marketed under the name Reactopaque 100, (Omnova Solutions Inc., Performance Chemicals, 1476 J.A. Cochran By-Pass, Chester, South Carolina 29706 USA) and sold by the company Ondeo Naico Co., with headquarters in Ondeo Naico Center, NAPERVILLE, Illinois, 60563 USA, or their chemical equivalents. When using such salts can be used diamido salt in the amount of from 0.025 to 0.25 wt.% dry mass of diamide salt.

Other selected components include nitrogen-containing compounds. Their non-limiting examples include organic nitrogen-containing compounds such as oligomers and polymers that contain one or more functional groups of the Quaternary ammonium. Such functional groups may vary over a wide range and include, for example, substituted and unsubstituted amines, imine, amides, urethanes, groups, Quaternary ammonium, dicyandiamide, guandi and other Examples of such materials are polyamine, polyethyleneimine, copolymers diallylamine-t is lemoniada (DADMAC), copolymers of vinylpyrrolidone with Quaternary di-ethylaminomethyl (DEAMEMA), polyamides, cationic polyurethane latex, cationic polyvinyl alcohol, copolymers of polyalkylene and dicianni-Dov, the polymers with the addition of minglecity, polyoxyethylene (dimethylimino)ethylene (dimethylimino)ethylene] dichloride, guanidine polymers and polymeric biguanides. The possible combinations of these nitrogen-containing compounds. Some examples of these compounds are given in U.S. patent No. 4,554,181, U.S. patent No. 6,485,139, U.S. patent No. 6,686,054, U.S. patent No. 6,761,977 and U.S. patent No. 6,764,726, the full amount of each of which are incorporated herein by reference.

Expandable microspheres may contain an extensible shell, forming the emptiness inside her. Expandable sheath may contain carbon or heteroatomic compound. Example of carbon and/or heteroatomic compounds can serve as an organic polymer and/or copolymer. The polymer and/or copolymer may be branched and/or crosslinked.

Expandable microspheres are preferably expandable by heating a hollow sphere of a thermoplastic polymer containing a thermally activated expanding agent. Examples of compositions of expandable microspheres, their contents, methods of manufacture and use can be found in U.S. patent No. 3,615,972; 3,864,181; 4,06,273; 4,044,176 and 6,617,364, which are incorporated herein in full by reference. You can also mention the patent publication U.S. No. 2001/0044477; 2003/0008931; 2003/0008932 and 2004/0157057, which are incorporated herein in full by reference. Microspheres can be made from polyvinylidenechloride, polyacrylonitrile, polyalkylacrylate, polystyrene or vinyl chloride.

The microspheres may contain a polymer and/or copolymer that has a glass transition temperature in the range from -150 to +180°C, preferably from 50 to 150°C., most preferably from 75 to 125°C.

Microspheres can also contain at least one foaming agent, which after exposure to a certain amount of thermal energy creates internal pressure on the inner wall of the microspheres so that the microsphere is expanding. Foaming agents may be liquids and/or gases. In addition, examples of the foaming agents can be selected from molecules with a low boiling point and their combinations. These foaming agents may be chosen from lower alkanes, such as neopentane, neohexane, hexane, propane, butane, pentane and its isomers. Isobutane is the preferred blowing agent for polyvinylidenechloride microspheres. Examples of unexpanded and expanded microspheres coated is shown in U.S. patent No. 4,722,43 and 4,829,094, which are incorporated herein in full by reference.

Expandable microspheres can have an average diameter from 0.5 to 200 μm, preferably from 2 to 100 μm, most preferably from 5 to 40 microns in unexpanded condition and expanded to a maximum of from 1.5 to 10 times, preferably from 2 to 10 times, most preferably from 2 to 5 times the average diameter.

In one embodiment, the expandable microspheres may be neutral, negatively or positively charged, preferably negatively charged.

One way of implementing the present invention relates to a recording sheet for printing that contains a basis of cellulose fibers and in contact with at least one surface sizing substance containing at least one water-soluble salt of the divalent metal, and the basis and sizing substance interact for the formation of the I-beam structure. The authors of the present invention unexpectedly found that the level of the sizing basis can be reduced if a sizing substance interacts with the core for the formation of the I-beam structure.

Measurement of the color gamut can be performed by known methods.

In one embodiment, the recording sheet has improved the drying time of the image, to the which is determined by the amount of paint moved from printed to neotectonic part of the recording sheet after rolling roller with a fixed mass. "Ink deposits stay" is defined as the optical density transferred after rolling roller; it is expressed as a percentage of optical density, moved to neotitanium part of the recording sheet after the rolling roller. This method involves printing solid blocks of color on paper, waiting for a certain period of time, 5 seconds after printing, the subsequent folding in half so that the printed portion was in contact with neotectonic part of the recording sheet, and rolling a hand roller weighing 4.5 pounds, as, for example, roller catalog number HR-100 from Chem Instruments, Inc., Mentor, Ohio, USA. The optical density read at an adjourned (ODt), transferred (ODo) parts of the block and the image area (ODB) using a reflective densitometer (X-Rite, Macbeth. Etc.). The percentage of transfer ("IT%") IT is defined as%=[(ODt-DB)/(D0-DB)]X100.

With regard to this document, the value of the Hercules sizing ("HST") basis and the number and/or type of water-soluble salt of the divalent metal may be selected so that the recording sheet had a percentage of Krasnoperekopsk ("IT%") equal to or less than 60. Preferably, IT% ranges from 0% to 50%. More preferably, IT% with the hat from 0% to 40%. Most preferably, 1T% ranges from 0% to 30%.

In addition to improved drying time of the image recording sheets have good print quality. Used herein, the term "print quality" (PQ) measured on two important parameters: the print density and the sharpness of the edges. The print density was measured using a reflection densitometer (X-Rite, Macbeth. Etc.) in units of optical density ("OD"). This method includes printing a solid block of color on the sheet and the measurement of optical density. There are some changes in OD, depending on the specific printer and the selected print mode and the operation mode, and color settings of the densitometer. The printer is not specifically limited and can be used, for example, HP DeskJet 6122, manufactured by Hewlett-Packard, which uses the black cartridge No. 45 (product number HP 51645A). The print mode is determined by the type of paper and the selected print quality. Can be selected print mode with default values "Ordinary (uncoated) paper" and "Fast Normal quality". A suitable densitometer can be spectrodensitometer X-Rite model 528 with a 6 mm aperture Settings density measurement can be Visual color", "Status T" and the mode of the absolute density. Increase the print density you can usually see when the surface of the paper are DOS is enough amount of water-soluble salts of divalent metal. Usually the target optical density for black pigment ("ODo") equal to or greater than 1.10 in standard mode printing (plain paper, normal quality) for desktop inkjet HP printers that use the regular black ink (equivalent to cartridge No. 45). Preferably, ODo equal to or greater than 1,15. More preferably, ODo is equal to or greater 1,20. Most preferably, OD equal to or greater than 1,50 or even 1,60. ODo may be equal to or more 1,1, 1,15, 1,2, 1,25, 1,3, 1,35, 1,4, 1,45, 1,5, 1,55 and even equal to or greater than 1,6, including all ranges and subranges within these limits.

Recording sheets have a good edge sharpness ("EA"). The sharpness of the edge is measured in such a device, as, for example, the System for analyzing the individual images QEA (Quality Engineering Associates, Burlington, Massachusetts), QEA ScannerlAS or the ImageXpert system KDY-based camera. All these devices are used to obtain a magnified digital image of the sample and calculate the value of the sharpness of the edges in the process of image analysis. This value is also referred to as "graininess edge", and it is defined in ISO 13660. The method includes printing a solid line with a length of 1.27 mm or more sampled at a resolution of at least 600 dpi. The device calculates the location of the edge based on the dark color of each pixel is near the edges of the line. The threshold region is defined as a point 60% PE is ehoda from the reflection coefficient of the base (light area, Rmax) to the reflectance image (dark-region, R-max) using equation R60=Rmax-60% (Rmax-Rmin). The graininess of the edge is then defined as the standard deviation of the residual values from the fitted line to the threshold of the edge line is calculated perpendicular to the fitted line. Is the sharpness of the edge is preferably less than 15. Preferably, less than 12 EA. More preferably, less than 10 EA. Most preferably, the EA is less than about 8.

The recording sheet preferably has a high dimensional stability. Recording sheets having high dimensional stability, preferably have a reduced tendency to curl. Therefore, the preferred recording sheets of the present invention have a reduced tendency to curl compared to conventional recording sheets.

One useful indicator of dimensional stability is a physical measurement of gyroresonance, such as gyroresonance Neenah method 549 TAPPI through electronic monitoring and control relative humidity (RH) using desicator and humidifier, and not just the salt concentration. RH environment varies from 50% to 15%, then 85%, causing dimensional changes of the measured sample paper. For example, the recording sheet of this image is to be placed may be gyroresonant in the transverse direction when the change in RH, as mentioned above, from 0.1 to 1.9%, preferably from 0.7 to 1.2%, most preferably from 0.8 to 1.0%. This range includes 0,1, 0,2, 0,3, 0,4, 0,5, 0,6, 0,7, 0,8, 0,9, 1,0, 1,1, 1,2, 1,3, 1,4, 1,5, 1,6, 1,7, 1,8 and 1.9%, including all ranges and subranges within these limits.

The recording sheet preferably has an internal connection in the longitudinal direction from 10 to 350 ft-lbs ×10-3per square inch, preferably from 75 to 120 ft-lbs ×10-3per square inch, more preferably from 80 to 100 ft-lbs ×10-3per square inch, most preferably from 90 to 100 ft-lbs ×10-3per square inch. This range includes 10, 11, 12, 13, 14, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70,75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150, 160, 165, 170, 175, 180, 185, 190, 195, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320, 330, 340 and 350 ft-lbs ×10-3per square inch, including all ranges and subranges within these limits. Internal connection in the longitudinal direction is the Link Scott, measured by TAPPI method t-569.

The recording sheet preferably has an internal connection in the transverse direction of from 10 to 350 ft-lbs ×10-3per square inch, preferably from 75 to 120 ft-lbs ×10-3per square inch, more preferably from -80 to 100 ft-lbs ×10-3per square inch, most preferably from 90 to 100 ft-lbs ×10-3per square inch. This range includes 10, 11, 12, 13, 14, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65,70, 75, 80, 85, 90, 95, 00, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150, 160, 165, 170, 175, 180, 185, 190, 195, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320, 330, 340 and 350 ft-lbs ×10-3per square inch, including all ranges and subranges within these limits. Internal communication in the transverse direction is the Link Scott, measured by TAPPI method t-569.

Both of the above internal communication in the transverse direction and in the longitudinal direction, measured by TAPPI method t-569, can also be measured in j/m2. Conversion factor to convert ft-lbs ×10-3per square inch in j/m2equal to 2. Therefore, to convert the internal communication within 100 ft-lbs ×10-3per square inch in j/m2you just need to multiply by 2 (i.e., 100 ft-lbs ×10-3per square inch ×2 j/m2) 1 ft-lb ×10-3per square inch=200 j/m2. All of the above ranges of foot-pounds ×10-3per square inch, so then can include relevant ranges in j/m2below.

The recording sheet preferably has an internal connection in the longitudinal direction from 20 to 700 j/m2preferably from 150 to 240 j/m2, more preferably from 160 to 200 j/m2most preferably from 180 to 200 j/m2. This range includes 20, 22, 24, 26, 28, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 320, 330, 340, 350, 360, 370, 380, 390, 400, 420, 440, 460, 48, 500, 520, 540, 560, 580, 600, 620, 640, 660, 680 and 700 j/m2including all ranges and subranges within these limits. Internal connection in the longitudinal direction is the Link Scott, measured by TAPPI method t-569.

The recording sheet preferably has an internal connection in the transverse direction of from 20 to 700 j/m2preferably from 150 to 240 j/m2, more preferably from 160 to 200 j/m2most preferably from 180 to 200 j/m2. This range includes 20, 22, 24, 26, 28, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 320, 330, 340, 350, 360, 370, 380, 390, 400, 420, 440, 460, 480, 500, 520, 540, 560, 580, 600, 620, 640, 660, 680 and 700 j/m2including all ranges and subranges within these limits. Internal communication in the transverse direction is the Link Scott, measured by TAPPI method t-569.

The recording sheet can have any internal communication/number of sizing agent. In one embodiment, the core contains large amounts of sizing agent and/or downloaded a sizing agent, and at the same time has a low internal connection. Accordingly, in one embodiment, the internal communication/number of sizing agent can reach 0. In another embodiment, the recording sheet has an internal bond that or decreases, or stetsasonic, or minimum increases with the content of the sizing and/or downloaded a sizing agent. In another embodiment, the change in the internal communication of the recording sheet is 0, negative or small positive number to increase the number of downloadable sizing agent. It is desirable that the recording sheet had such phenomenon, with varying degrees wt.% solids in the sizing substance, applied to the fiber in the sizing press, as mentioned above. In yet another embodiment, it is desirable that the recording sheet had any one and/or all of the above phenomena, and also had greater surface hardness, measured by determining the strength plucking and/or seizure of wax.

The recording sheet can have any internal communication/number of sizing agent. The internal communication/number of sizing agent may be less than 100, preferably less than 80, more preferably less than 60, most preferably less than 40 j/m2/g/m2. The internal communication/number of sizing agent may be less than 100, 95, 90, 85, 80, 75, 74, 73, 72, 71, 70, 69, 68, 67, 66, 65, 64, 63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 38, 35, 32, 30, 28, 25, 22, 20, 18, 15, 12, 10, 7, 5, 4, 3, 2 and 1 j/m2g/m2including all ranges of the sub-bands in this range.

The paper base preferably has a Gurley porosity of from 5 to 100 C/100 ml This range includes 5, 10, 11, 12, 13, 14, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 75, 80, 90, 95 and 100 seconds/100 ml, including all ranges and subranges within these limits. The Gurley porosity measured by TAPPI method t 460 om-88.

The paper base preferably has a stiffness in the transverse direction Gurley from 100 to 450 mgf, preferably from 150 to 450 mgf, more preferably from 200 to 350 mgf. This range includes 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290. 300, 310, 320, 330, 340, 350, 375, 400, 425 and 450 mgf including all ranges and subranges within these limits. The stiffness in the transverse direction measured by the Gurley method TAPPI t-543.

The paper base preferably has a Gurley stiffness with in a longitudinal direction from 40 to 250 mgf, more preferably from 100 to 150 mgf. This range includes 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140,150, 160, 170, 180, 190, 200, 210, 220, 230, 240 and 250 mgf, including all ranges and subranges within these limits. Stiffness in Gurley in the longitudinal direction is measured by TAPPI method t-543.

The paper base is preferably an opacity of from 85 to 105%, more preferably from 90 to 97%. This range includes 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104 and 105%, including all ranges and subranges within these limits. Opacity is measured by TAPPI method t-425.

The recording sheet of the present invention moretime any whiteness CIE, but preferably more than 70, more preferably greater than 100, most preferably more than 125 or even 150. White CIE may range from 125 to 200, preferably from 130 to 200, most preferably from 150 to 200. The CIE whiteness may be greater than or equal 70, 80, 90, 100, 110, 120, 125, 130, 135, 140, 145, 150, 155, 160, 65, 170, 175, 180, 185, 190, 195 and 200 points of CIE whiteness, including all ranges and subranges within these limits. Examples of measurement of CIE whiteness and get this white fibers for making paper and made from paper can be found, for example, in U.S. patent No. 6,893,473, which is incorporated herein in full by reference. In addition, examples of measurement of CIE whiteness and get this white fibers for making paper and made from paper can be found, for example, in patent application U.S. No. 60/654,712, filed February 19, 2005, and in patent applications U.S. No. 11/358,543, dated 21 February 2006, No. 11/445809 on June 2, 2006 and No. 11/446421 on June 2, 2006, which are also incorporated herein in full by reference.

The recording sheet of the present invention can have any ISO brightness, but preferably more than 80, more preferably greater than 90, most preferably more than 95 points ISO brightness. The ISO brightness may preferably be from 80 to 100, more preferably from 90 to 100, most preferably is from 95 to 100 points ISO brightness. This range includes values greater than or equal to 80, 85, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99 and 100 points brightness ISO, including all ranges and subranges within these limits. Examples of measuring the brightness ISO and obtain a brightness of fibers for making paper and made from paper can be found, for example, in U.S. patent No. 6,A that vkluchen this document in full by reference. In addition, examples of measuring the brightness ISO and obtain a brightness of fibers for making paper and made from paper can be found, for example, in patent applications U.S. No. 60/654,712 dated February 19, 2005 and 11/358,543, dated 21 February 2006, which is also incorporated herein in full by reference.

The recording sheet has superior characteristics for printing and superior patency (e.g., characteristics of a printing press). Specifications for printing can be measured by determining the superior density of paint, diffusion of the point, capture color, contrast print and/or color tone. Colors, which are traditionally used in such tests characteristics include black, cyan, Magenta and yellow, but in any case they are not limited. Specifications for printing can be determined by definitions of contamination by visual inspection of printed systems, cloths, plates, delivery systems, is or ink into etc. Contamination usually involves contamination of the fibers, coating or sizing, filler or binder, accumulation of dirt on the rollers, etc. of the Recording sheet of the present invention has superior characteristics for printing and/or patency, defined by each or any, or a combination of the above characteristics.

The recording sheet can be of any strength surface. Examples of physical tests of strength of the substrate surface, which also correlate well with the printing characteristics of the framework are checking the resistance to picking and checking the grip wax. In addition, both types of tests that are known in this area correlate well with good durability of the surface of the recording sheet. Although you can use any of these checks, preferred are checking the resistance to picking. Check resistance plucking is a standard test in which the characteristics measured by Tappi method 575, which corresponds to the standard method ISO 3873.

The recording sheet may have at least one surface with strength, measured by checking the resistance to picking, which is equal to at least 1, preferably at least to 1.2, more preferably at least 1,4, most preferably at least 1.8 m/s On the Nova has a surface hardness, measured by checking the resistance to picking, which is at least 2,5, 2,4, 2,3, 2,2, 2,1, 2,0, 1,9, 1,8, 1,7, 1,6, 1,5, 1,4, 1,3, 1,2, 1,1 and 1.0 m/s, including all ranges and subranges within these limits.

Another known type of validation is to check for delamination, which is known in the art (and is measured in N/m). The value of the bundle of the recording sheet of the present invention may be any, but preferably more than 150 N/m, more preferably more than 190 N/m, most preferably more than 210 N/m If the basis is the basis of paper for reproduction, the separation is preferably from 150 to 175 N/m, including all ranges and subranges within these limits.

The paper base may be any base mass. She may have a high or low base weight, including a base weight of at least 10 pounds per 3000 square feet, preferably at least 20 to 500 pounds per 3000 square feet, more preferably at least 40 to 325 pounds per 3000 square feet. Base weight may be at least 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 125, 150, 175, 200, 225, 250, 275, 300, 325, 350. 375, 400, 425, 450, 475 and 500 pounds per 3000 square feet, including all ranges and subranges within these limits.

The paper base according to the present invention can have any apparent density. The apparent density can be from 1 to 20, prepact the tion from 4 to 14, most preferably from 5 to 10 pounds per 3,000 square feet at a thickness of 0.001 inch. The density may be at least 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 and 20 pounds per 3,000 square feet at a thickness of 0.001 inch, including all ranges and subranges within these limits.

The paper base according to the present invention can be of any thickness. The thickness burn to be from 2 to 35 mils, preferably from 5 to 30 mils, more preferably from 10 to 28 mils, and most preferably from 12 to 24 mil. The thickness can be at least 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34 and 35 mils, including all ranges and subranges within these limits.

The recording sheet can be printed by creating images on the surface of the recording sheet with the use of traditional methods and printing devices, for example, laser, inkjet, offset and flexo printing. In this way the recording sheet of the present invention is administered in a printing device, and the image is formed on the surface of the sheet. The recording sheet of the present invention may be printed by ink jet methods and devices, such as desktop or high-speed commercial. In one embodiment, provides a method of inkjet printing, where the aqueous recording liquid is applied to p is gastronomy sheet of the present invention in the form of an image. In another embodiment, provides a method of inkjet printing, which includes: (1) introduction of the recording sheet of the present invention in an inkjet printing device, and (2) the filing of drops of ink to form images on the recording sheet than on a recording sheet an image. Methods of inkjet printing are well known and described, for example, in U.S. patent No. 4,601,777, U.S. patent No. 4,251,824, U.S. patent No. 4,410,899, U.S. patent No. 4,412,224 and U.S. patent No. 4,532,530. In one embodiment, an inkjet printer uses thermal inkjet printing, in which ink in the nozzles is selectively heated to form the image, and drops of paint removed on the recording sheet in the form of an image. The recording sheet of the present invention can also be used in any other method of printing or receiving images, for example, printing plotters, acquiring images in color laser printers or copiers, writing with ink pens, methods, offset printing, etc. under the condition that the toner or ink used to form the image that is compatible with the receiving ink layer of the recording sheet. Such compatibility can easily be determined by the average expert in the field of printing, after reading the present description.

The content of s is part of the patent application U.S. No. 60/759,629, filed January 17, 2006, provisional patent application U.S. No. 60/853,882, filed on October 24, 2006, provisional patent application U.S. No. 60/759,630, filed January 17, 2006, patent application U.S. No. 10/662,699, filed September 15, 2003 Nov published April 8, 2004 as publication No. 2004/0065423 patent application U.S. patent application U.S. no.11/655,004, filed January 17, 2007 Nov published February 14, 2008 gcac publication No. 2008/0035292 patent application U.S., incorporated herein by reference.

All contents of the Directory engineer pulp and paper production, G.A. Smook (1992) Angus Wilde Publications, incorporated herein by reference.

All references, and the reference materials listed in this document are incorporated herein by reference in relevant parts relating to the subject matter of the present invention and all variants of its implementation.

EXAMPLES

The present invention may also be described in detail with reference to the following examples. These examples are intended to be illustrative, but the invention is not considered limited to the materials, conditions, or process parameters described in the examples. All proportions and percentages are expressed in weight units, unless otherwise indicated.

CONDITIONS AND DEVICE FOR COATING: Conditions and device for coating on isany below and in table 1. Recording sheets were prepared in paper machines or small presses: device DT for coating and sizing press with a bathtub. As the device is DT, and the size press with a bath are small machines for coating on the paper roll widths up to 12 inches at a speed of about 100 feet per minute. The device DT is a laboratory device, manufactured by DT Paper Science of Finland and sold in the U.S. the company Kaltec Scientific, Novi, Michigan. The coating is applied within 1-2 minutes after the device will pick up speed and the deposition process is stabilized. The device DT can work in batched mode size press with a scraper or rod. In these modes, the coating is applied only on one side of the sheet in one pass. For the purposes of the invention, the device DT is used in a metering rod. To change the thickness of the wet film applied on the shaft and then on the sheet that is used by several rods of different sizes. Dry grip (pounds of dry matter per ton of paper) can be adjusted by selection of the rod and the percentage of solids. Then the paper is dried in an infrared dryer and after it in the oven with injected air (non-contact drying in both cases). The device DT covers one side in one pass, the other side should be coated before or after the first. For the purposes from the retene paper was usually coated on the first side and checked h-structure on this side (the amount of penetration of the coating into the sheet) before as to cover the second side. The second side is then covered with a simple composition (starch). The second side was covered in the same conditions as the first to support the formation of h-structures on both sides of the paper. It was necessary to cover both sides of the paper with the same grip to minimize twisting of the sheet for easy printing with minimal jams.

Press with tub covers both sides of the paper simultaneously. The paper is impregnated with the liquid coating before passage through the pressure zone between the two shafts, which limits the capture. The pressure is set to get a grip wet substances 25-35% of the dry weight of the sheet. If dry paper weighs 1 gram before passage through the bath and the pressure zone, after wetting it will weigh 1.25 and 1.35 grams. Then the paper is dried four steam drums (contact drying, as in most paper machines).

Both paper machines feature size presses with a metering rod that is coated on both sides of the paper simultaneously. Then the paper is dried several steam drums (hot shaft of stainless steel, filled with steam under pressure).

In table 1 conditions a, E and F and the corresponding regestriruius the e leaves correspond to the implementation of the present invention; conditions b, D and G and the corresponding recording sheets are included for comparison.

EXAMPLE 1: Evaluation of I-beam structure (Figure 1): two differently prepared sample, a and B were applied starch. The sample And had no I-beam structure, the sample had an I-beam structure. These samples were tested for penetration of the starch in the z-direction under an optical microscope to determine whether there is in some of the samples I-beam structure.

The penetration of starch was measured in the cross section of the sample made with a razor blade, placing a solution of iodine and receiving the image in approximately 5 minutes. For each sample, the measurement was repeated four times. For each sample shows one image that best presented the General characteristics of the penetration of the starch. The sample was fully saturated with starch (Figure 1). The sample had an I-beam structure that was visible starch on each side of the sheet and does not contain starch region in the center (Figure 1). Unusual color reaction sample can be attributed to the use of oxidized starch Clinton 442.

EXAMPLE 2: Prepared two sizing composition and recording sheets prepared in the device DT according to the Condition And from table 1;

Starch + CaCl2(Sample 7) and Starch + ICC + l2(Sample 8)

Four ur is una salt: 0, 3, 5, 8 pounds per ton

Paper with a base weight of No. 20

The pressure in the zone pressure: 3 psi (Sample 7) and 6 pounds per square inch (Sample 8)

Optical microscopy is labeled with iodine samples in the cross-section showed that both values of the pressure I gave patterns (Figure 2). Both pressure values 3 and 6 psi, respectively, gave similar results print (Figure 3). The combination of the pigment caso3and CaCl2gave increased average color gamut (Figure 3).

EXAMPLE 3: Recording sheets prepared in accordance with Condition F of table 1 of the paper 8.5 x 11 inches. The checklist did not contain CaCl2. Sheets 1 and 2 contained 7 pounds CaCl2per tonne (Figure 4). Front side (AFS) and the reverse side (SS) were printed and evaluated by the average color gamut. Increased color gamut observed for samples 1 and 2.

EXAMPLE 4 (Comparative): Recording sheets prepared according to the criteria In table 1:

Starch + l2

Starch + ICC + CaCl2

Four levels of salt: 0,3, 5, 8 pounds per ton

Paper with a base weight of No. 20

To print images for the assessment of used printer HP B9180. Comparative example and the results obtained in the sizing press, shown in Figure 5 (the average value of the color gamut of Example 2 using device DT is also shown in Figure 5). In General, higher color gamut watched for recording sheets, prepared according to the Condition And from table 1. The lower average color coverage was observed for the comparative recording sheets prepared according to the Condition In table 1.

EXAMPLE 5: Recording sheets prepared according to the Condition G from table 1 and printed on the printer Kodak 5300. Estimated color gamut, the results are shown in Fig.6. Recording sheets prepared according to the Conditions a, b and F from table 1, evaluated, and results are also shown in Fig.6. Higher color gamut observed for the recording sheets prepared according to the Conditions a and F, relative to the comparative recording sheets prepared according to the Conditions and G.

EXAMPLE 6: figure 7 shows the average value of the color gamut of the samples without pigment, prepared in accordance with the Conditions a, b and G from table 1. Even in the absence of pigment, the recording sheets prepared according to the Condition And showed higher color gamut compared to the comparative recording sheets prepared according to the Conditions and G.

EXAMPLE 7: Fig shows the average value of the color gamut for containing the pigment of the recording sheets prepared according to the Conditions a, b and F from table 1. It is seen that the presence of the pigment increases the average value of the color gamut for both recording sheets, under otbelennyh according to Conditions a and F from table 1. These recording sheets also have a higher average color gamut relative to the comparative recording sheet prepared in accordance with the Terms of the Century

EXAMPLE 8: figure 9, 10 and 11 shows the results of estimating the density of the black with the three printers HP 6122, HP B9180 and Kodak 5300 on the recording sheets prepared according to the Conditions a and F, and on the comparative recording sheet prepared in accordance with the Conditions In a, D and G.

Without being bound to theory, it is possible that the density of inkjet printing for pigmented inks may depend on the salt concentration on the surface (against the seizure of salt (in pounds per ton)). Suddenly I structure seems to increases the density of inkjet printing and color grip. The pigment is added in a sizing press, does not improve the print density with fewer added l2that gives cost savings.

EXAMPLE 9: the Recording sheets prepared in accordance with the Terms C and D. Data are not shown, but the printing results were mixed for the recording sheet prepared by Condition C. Optical microscopy labeled with iodine samples (not shown) showed that both Conditions (i.e., pigment ICC and without him was not of I-beam structure. One of the reasons may be impregnated with the reverse side of the sheet at elevated temperature the arts.

EXAMPLE 10: the Recording sheets prepared in accordance with the Conditions A, b and E of table 1. Medium color coverage and density of the ink was evaluated after print to two printers HP B9180 and Kodak 5300. The results are shown in Fig-15. The printing results obtained for pigmented and non pigmented recording sheets (Condition E), were similar to sheets prepared in accordance with Condition A. Optical microscopy labeled with iodine samples (not shown) showed that pigmented and non pigmented (Condition E) registering the sheets had I-beam structure.

EXAMPLE 10: separation sheet and analysis of the salt of divalent metal

Method of separating sheet:

(a) two plate glass with polished edges size 2 inches wide and 8 inches long. To take one of these plates and cut a piece of double-sided tape with a protective film. Remove the protective film from one side of the tape and attach the tape to the glass plate. The tape should fit snugly to the glass plate and not have wrinkles or air bubbles. Remove the protective film from the other side of the tape and trim the tape so that it will not extend beyond the edge of the glass plate.

(b) Weigh the glass plate with tape and record the mass of up to 0.0001,

(c) Place a piece of paper to test on a flat table, Pressed glass plate with ribbon (ribbon down) to the piece of paper so that the paper stuck to the tape. Trim the paper so that it will not extend beyond the edges of the ribbon.

(d) Weigh the glass plate, ribbon and paper and write down the weight up to 0.0001,

(e)Subtract mass from step (b) of the mass from step (d), to determine the weight of the scanned paper.

(f) Place a piece of double-sided tape (without wrinkles) on the paper, removing the protective film from one side of the tape. The tape should be longer than the paper that it acted on both sides of the paper 1 inch.

(g) Pulling one end of the tape, so that it remained on paper, and stop before the end of the list.

(h) Omit the tape to connect the sheet, then remove the protective film from the back side of the ribbon. Place the second glass plate on the ribbon, gluing it to the ribbon. Compress the plate and tape to ensure good adhesion of the second glass plate to the tape.

(i) Draw two glass plates in different directions, to completely separate the sheet. Trim the excess tape from the second glass plate. (J) to Weigh the first glass plate, ribbon and paper and record the mass of up to 0.0001,

(k) Subtract mass from step (j) of the mass from step (b)to determine the mass of paper remaining on the first glass plate.

(l) Subtract mass from step (j) of the mass from step (d)to determine the mass of paper, transferred to a second glass is nnow plate.

(m) Placing a piece of one-sided tape on the paper remaining on the first glass plate. Remove the tape and re-weigh the first glass plate, the tape and the rest of the paper.

(n) Subtract mass from step (m) of the mass from step (k)to determine how much paper was removed with single-sided tape.

(a) Continue to remove part of the paper remaining on the first glass plate, as there will not be 25% of the initial mass verifiable paper (determined at step (e)).

(p) to Collect sided tape, sample paper, label and place in a plastic bag for later analysis.

(q) Repeating steps (m)-(o) with the second glass plate.

(r) to Remove the double-sided tape from the glass plates and mark.

Analysis of the salt of divalent metal

The order of operations for the full sample sheets (8.5×11 inch):

(a) From a sample submitted for analysis was cut off portion of the paper weight of 2.2 g

(b) This part of the paper was placed in 50 ml of water purified by reverse osmosis (water 00), and soaked for two hours.

(c) the Aqueous solution then was filtered through standard filter paper and washed with 30 ml of additional water 00.

(d) Then the filtered solution was added 00 water to bring final volume to 100 ml.

(e) the Solution is then treated with nitric acid and Rabba is or up to 500 ml Then they were analyzed using a mass spectrometer with inductively coupled plasma for determination of the concentration of the ions of the salt of divalent metal, for example, if salt is calcium chloride, determine the ions are Ca, CL. In addition, since the framework can contain salts of monovalent metal, such as sodium chloride, will be determined by the amount of Na ion, to allow one to calculate the exact amount of calcium chloride.

(f) the Amount of salt of the divalent metal in the paper were calculated from the measured ion concentrations adjusted for the presence of monovalent metal salts, and the result is expressed in parts per million by weight of the salt of the divalent metal and the mass of the resulting paper.

Modified the order of operations for samples of the separated sheet:

(a) Sample paper, glued to the tape, soaked in 30 ml of water 00 for two hours.

(b) an Aqueous solution then was filtered through standard filter paper and washed with 20 ml of additional water 00.

(c) Then the filtered solution was added 00 water to bring the final volume to 50 ml

(d) the Solution is then treated with nitric acid and diluted to 100 ml and Then analyzed using a mass spectrometer with inductively coupled plasma for determination of the concentration of ions of salts of divalent metals and salts one is Alannah metals (like above).

(e) the Amount of salt of the divalent metal in the paper were calculated from the measured ion concentrations adjusted for the presence of a salt of monovalent metal, and the result is expressed in parts per million by weight of the salt of the divalent metal and the mass of the resulting paper (prepared by the method of separation of the sheet).

(f) the concentration of the salt of divalent metal is then compared with the results obtained in the analysis of the full sheet of the same foot paper or test conditions, to determine how salt of divalent metal full sheet distributed in the samples separated list.

Application of the method of separation of the sheet and analysis of the salt of divalent metal Tested two types of paper, using the method of separation of the sheet to determine the distribution of calcium chloride, a salt of divalent metal sheet. The first type of paper (sample according to the invention) was made on the press experienced type in the dispensing rod to apply a sizing composition comprising starch and calcium chloride on one side of the paper. The second type was a commercially available paper, manufactured and sold by International Paper Company, and this paper contains a composition of calcium chloride and starch deposited in the sizing press. Analysis of the separated sheet and the analysis of the full sheet shown in table 2.

Table 2
The results of the analysis of chloride of calcium in divided sheet and full sheet
SampleFull sheet (parts per million l2)Split sheet (outer 25%) (ppm l2)
Selling paper1000012500
The sample according to the invention16006300

These data show that sold sheet has a fairly homogeneous distribution of calcium chloride in the list, with only slightly elevated concentration of calcium chloride on the surface in comparison with a mean concentration of calcium chloride in the sheet. On the other hand, the sample according to the invention shows a much higher concentration of calcium chloride in the outer 25% of the sheet in comparison with the average value of concentration in the leaf. In fact, if the concentration in the outer 25% of the sheet divided by four, the result is 1575 parts per million, which is clearly similar to the average concentration in the leaf. This means that almost all of the calcium chloride is in the outer 25% of the sheet.

All this is m document the ranges of values are used to specify each value in this range, including all subranges therein. In light of the above description numerous possible modifications and changes of the present invention. It is therefore understood that within the scope of the attached claims it can be implemented otherwise than specifically described above.

1. The recording sheet containing:
the base of the canvas cellulose fibers; and
a sizing composition comprising a binder and a salt of the divalent metal, characterized in that the said composition is applied on the outer surface or on both surfaces of the above mentioned bases, or next to these surfaces, so that the salt concentration of the divalent metal value of at least 51% of the total concentration of not less than 2500 parts per million is located at a distance that is within 25% of the total thickness of the basics at least one surface of the said base, such that the record has a value of Qtotalreflecting a measure of the amount of sizing agent in the transition from the outer edges to the middle of the sheet in the cross section of less than 0.5.

2. The recording sheet according to claim 1, characterized in that the concentration of the mentioned salts of divalent metal is within 25% of the total thickness of the basics at least one surface of the above mentioned bases so that the optical density for black pigment "OD owhen printing on the recording sheet was at least 1,15.

3. The recording sheet according to claim 1, characterized in that the said effective concentration of the mentioned salts of the divalent metal is at least 6000 parts per million.

4. The recording sheet according to claim 1, characterized in that the recording sheet has the sharpness of the edges of the image when printing less than 15.

5. The recording sheet according to claim 4, characterized in that the recording sheet is measured by TAPPI method t-569 internal communications Scott in the longitudinal direction is not more than 300 j/m2.

6. The recording sheet according to claim 4, characterized in that the sheet is measured by TAPPI method t-569 internal communications Scott in the transverse direction is not more than 300 j/m2.

7. The recording sheet according to claim 1, having measured by TAPPI method t-569 internal communications Scott in the longitudinal direction is not more than 300 j/m2.

8. The recording sheet according to claim 7, having gyroresonant, as measured by the TAPPI method 549, from 0.6 to 1.25%.

9. The recording sheet according to claim 7, characterized in that the recording sheet has the percentage of Krasnoperova less than or equal to 60.

10. The recording sheet according to claim 1, having measured by TAPPI method t-569 internal communications Scott in the transverse direction is not more than 300 j/m2.

11. The recording sheet of claim 10, characterized in, is that the recording sheet has gyroresonant, measured by TAPPI method 549, from 0.6 to 1.25%.

12. The recording sheet of claim 10, wherein the recording sheet has the percentage of Krasnoperova less than or equal to about 60.

13. The recording sheet according to claim 1, having gyroresonant, as measured by the TAPPI method 549, from 0.6 to 1.25%.

14. The recording sheet according to claim 1, having a percentage of Krasnoperova less than or equal to 60.

15. The recording sheet according to claim 1, characterized in that the said salt is present in an amount of from 2.5 to 165 of moles of cations per ton of paper substrate with respect to the base, having a basic weight of 250 g/m2.

16. The recording sheet according to claim 1, characterized in that the composition additionally contains at least one selected from the group consisting of starch, pigment, and combinations thereof.

17. The recording sheet according to claim 1, characterized in that the image is the average color gamut when printing on the recording sheet approximately 120000 or more.

18. The recording sheet according to claim 1, characterized in that the composition is applied in the sizing press.

19. A method of manufacturing a recording sheet according to any one of claims 1 to 18, including:
contact bases containing leaf cellulose fibers; and
a sizing composition containing a binder and a water-soluble salt of the divalent metal, with a viscosity of from 50 to 500 sandypaws and salt concentration is muhametovo metal not less than 2500 parts per million;
controlled placement of the binder and the water-soluble divalent salt inside the basis for the production of the recording sheet.

20. The method according to claim 19, wherein the contact is carried out in a sizing press.



 

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28 cl, 28 dwg, 12 tbl, 5 ex

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9 cl, 4 ex, 3 tbl

FIELD: chemistry.

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8 cl, 4 tbl, 10 ex

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46 cl, 16 tbl, 6 ex, 2 dwg

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EFFECT: higher efficiency of manufacturing.

6 ex, 1 tbl

FIELD: bleached mechanical pulp based on fibrillated cellulose fibers, hemicelluloses and lignin, paper made from said pulp, and method for producing said pulp using crystallized calcium carbonate in pulp-and-paper industry.

SUBSTANCE: method involves crystallizing calcium carbonate in said pulps and at least partly covering fibrillated cellulose fibers, hemicelluloses and lignin, with which calcium carbonate is strongly bound by mechanical binding. Method involves forming homogeneous water suspension by mixing lime and leached mechanical pulp based on fibrillated cellulose fibers, hemicelluloses and lignin; adding carbon dioxide into resulting suspension while mixing and keeping its temperature within the range of 10-50 C until lime is converted into calcium carbonate.

EFFECT: simplified method and improved quality of bleached mechanical pulp.

12 cl, 21 dwg, 5 tbl

The invention relates to the production of compositions for paper sizing and can be used in the paper industry

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FIELD: printing.

SUBSTANCE: invention relates to a method of manufacturing a security or valuable document, which includes the following steps: B) multilayer material is produced, which comprises a paper substrate, a masking layer provided on the paper substrate in the masking area, and marking substance modified by laser radiation, provided in the marked area, at that the marked area covers the masking area, and L) the multilayer material in the marked area is subjected to laser action in order to create the negative signs in the masking area simultaneously in register and discolored signs on unmasked areas of the marked area. At that before performing the step L) on the masking layer at least in the marked area the recesses are made in the form of patterns, signs or a code.

EFFECT: invention provides a high degree of protection against forgery.

25 cl, 22 dwg

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