Improved method for production of paper and cardboard production

FIELD: textile, paper.

SUBSTANCE: method includes formation of composition, containing water, raw starch and powder optical refining agent. Boiling of composition. Application of finished composition, at least on one surface of paper or cardboard base in coating press. Then base is dried. In another version of method composition is boiled at the temperature up to 299°F inclusive.

EFFECT: improved brightness of paper and cardboard.

7 cl, 4 dwg, 8 tbl, 1 ex

 

The technical FIELD

The present invention relates to an improved method of production of paper and cardboard products, and paper and cardboard products produced by this method. More specifically, the present invention relates to a method for production of paper and cardboard products.

The LEVEL of TECHNOLOGY

The brightness and whiteness of paper or cardboard can be improved, for example, the surface treatment of paper or cardboard canvases optical bleach or optical brighteners (OO). OO absorbs ultraviolet light and then emits it to the wavelengths of visible light, measured in a range of reflection.

BRIEF description of the INVENTION

One aspect of the present invention relates to a method for production of paper and cardboard products, including:

forming a composition containing water, raw starch and powdered optical Brightener;

the cooking composition for the finished compositions containing boiled or hydrogenated starch and powdered optical Brightener;

the application of the finished composition on at least one surface of the paper or cardboard bases in the sizing press in the method of manufacturing paper or cardboard to obtain sized paper or paperboard substrate and

drying of the glued paper or cardboard is the basis for the dried paper or cardboard base.

Another aspect of the present invention relates to a method of production of the products of the sized paper or paperboard, including:

the formation of a sizing composition containing water, raw starch and powdered optical Brightener;

the cooking composition at temperatures up to and including 299°F to get ready a sizing composition containing boiled starch and powdered optical Brightener;

applying a sizing composition on at least one surface of the paper or cardboard bases in the sizing press in the method of manufacturing paper or cardboard to obtain sized paper or paperboard substrate and

drying of the sized paper or paperboard base for receiving the dried paper or cardboard base.

Another aspect of the present invention refers to the dried paper or cardboard base, obtained by the method of the present invention. The method of the present invention and dried and glued paper and cardboard bases obtained by the method of the present invention have one or more advantageous properties. For example, dried and glued paper or cardboard base, obtained by the method of the present invention,

has elevated the upper brightness compared to the dried and sized paper or cardboard base, receiving the Noi traditional ways, in which the liquid optical Brightener is added to the cooked starch to form a composition for size press.

Another aspect of the present invention relates to finished compositions containing boiled starch and powdered optical Brightener.

BRIEF DESCRIPTION of DRAWINGS

To fully understand the present invention from the following description of preferred options for its implementation, taken together with the attached drawings, on which:

FIG. 1 is a graph of the directed Tappi brightness against the absorption of optical brighteners in grams on the basis of example 1;

FIG. 2 is a graph of CIE whiteness against the absorption of optical brighteners in grams on the basis of example 1;

FIG. 3 is a graph of the directed Tappi brightness against the absorption of optical brighteners in grams on the basis of example 2 and

FIG. 4 is a graph of CIE whiteness against the absorption of optical brighteners in grams on the basis of example 2.

DETAILED description of the INVENTION

Although the present invention can be implemented in many different forms, the drawings shown and described in the examples and the subsequent description of preferred embodiments of with the understanding that this disclosure be regarded as an illustration of the principles of the invention and should not limit the broad aspect of the invention provides variants is sushestvennee.

In the methods of the present invention, a sizing composition containing boiled starch and powdered optical Brightener, is applied at least on one surface of a paper or cardboard base. The viscosity of the sizing composition may vary within wide limits. For example, the viscosity may be low, approximately 20 centipoise, and high, about 350 centipoise and above. The viscosity is from about 100 to 300 centipoise, more preferably from about 150 to 250 centipoise centipoise and most preferably from about 175 to 225 centipoise CP.

The percentage of solids in the sizing composition may vary within wide limits. For example, the percentage of solids may be low, approximately 4%, and high, approximately 22% of the total weight of sizing composition.

The percentage of solid particles is preferably from about 8% to 21%, more preferably approximately from 10% to 19%, and most preferably is from about 13% to 18%.

The starch may be of any type, including, without limitation, oxidized, leaded, cationic, starch grains, and a combination of two or more of the mentioned types, and preferably used in aqueous solution. An example item is Chadasha starches to make this the preferred option implementation in practice are naturally occurring hydrocarbons, synthesized in corn, tapioca, potato and other plants by polymerization of dextrose units. All such starches and their modified forms, such as starch acetates, esters of starch ethers, starch, phosphate starch, xanthate starches, anionic starches, cationic starches, etc. that can be obtained by reaction of starch with a suitable chemical or enzymatic reagent, can be used to implement the present invention in practice.

Suitable starches can be prepared by known methods or obtained from commercial sources. For example, suitable starches include PG-280 company Penford Products, SLS-280 company St. Lawrence Starch, cationic starch CatoSize 270 of the company National Starch and hydroxypropyl No. 02382 Poly Sciences, Inc.

Preferred for implementing the present invention in practice are modified starches. More preferred are cationic modified or non-ionic starches, such as CatoSize 270 and KoFilm 280 (all from the company National Starch), and chemically modified starches, such as leaded starches PG-280 and starches AR Pearl. The preferred starches for the implementation of the present invention in practice are cationic starches and chemically modified starches.

The number is in the starch sizing composition may vary within wide limits, and you can use any number. For example, the amount of starch can be high, approximately 100% or higher or low, approximately 50% or higher of the total weight of the composition. The quantity of starch is preferably from about 60% to 90%, more preferably is from about 65% to 85%, and most preferably from about 70% to 80%, by weight of the total composition.

Powder optical Brightener (PA)used to implement the present invention in practice, can vary within wide limits and, for the purposes of the present invention can use any traditional OO, which is used or can be used for bleaching of mechanical or sulphate pulp. Optical brighteners are fluorescent coloring compounds that absorb light in the invisible ultraviolet region of the spectrum and then re-emit it in the visible part of the spectrum, particularly at wavelengths of blue and blue-violet. It gives extra brightness and can compensate for the natural yellow hue of the paper base. The optical brighteners used in the present invention, vary within wide limits, and you can use any suitable optical brighteners. The review of these clarifiers can be found, for example, in Encyclopedia of industrial the of their share capital Ullmann (Ullmann''s Encyclopedia of Industrial Chemistry), sixth edition, 2000 Electronic Release, OPTICAL BRIGHTENERS-Chemicals technical products, which are incorporated herein in full by reference. Other suitable optical brighteners are described in U.S. patents№5902454; 6723846; 6890454; 5482514; 6893473; 6723846; 6890454; 6426382; 4169810 and 5902454 and in the indicated reference materials, which are all incorporated herein by reference. Other suitable optical brighteners are described in published patent application U.S. No. 2004/014910 and 2003/0013628 and in WO 96/00221, as well as in the indicated reference materials, which are all incorporated herein by reference. Examples of suitable optical brighteners are 4,4'-bis-(creatininemia)stilbene-2,2'-disulfonate acid, 4,4'-bis(triazole-2-yl)stilbene-2,2'-disulfonate acid, 4,4'-dibenzobarrelenes, 4,4'-(diphenyl)stilbene, 4,4'-distributively, 4-phenyl-4'-benzoxazolinone, stillbornlittle, 4-steelstyle, derivatives of bis-(benzoxazol-2-yl), derivatives of bis(benzimidazole-2-yl)coumarins, pyrazoline, naphthalimide, triazinetrione, 2-sterillization or naftoxate, benzimidazole-benzofuran or akalinity.

Most commercially available optical brighteners have been prepared on the basis of chemical composition of stilbene, coumarin and pyrazoline, and they preferred to implement this is part II of the invention in practice. Preferred optical brighteners for implementing the present invention in practice are optical brighteners commonly used in the paper industry, based on stilbene, such as 1,3,5-triethynylbenzene 4,4'-diaminostilbene-2,2'-disulfonic acids and their salts, which may have additional sulfopropyl, for example, in positions 2, 4 and/or 6. Most preferred are the commercially available derivatives of stilbene, such as those offered for sale by the company Ciba Geigy under the trade name "Tinopal", by the company Clariant under the trade name "Leucophor"company Lanxess under the brand name "Blankophor", by the company 3V under the brand name "Optiblanc", such as optical brighteners based on disulfonate, tetrasulfonated and hexadentate stilbene. Of these the most preferred commercial optical brighteners most preferred are the commercially available optical Brightener based hexadentate and tetrasulfonated stilbene and most preferred are optical brighteners based hexadentate stilbene.

The amount of optical Brightener used in the practical implementation of the method of the present invention may vary within wide limits, and you can use any number up is sufficient to achieve the desired degree of brightness. In General, the smaller the amount of optical Brightener, the smaller the increase in the TAPPI brightness of the final pulp product. Conversely, the greater the amount of optical Brightener, the more increase the brightness of the pulp with the exception that, though, and without being bound to any theory, it is believed that at some point of time adding an optical Brightener will not have further appreciated effect on the brightness of the pulp and may even degrade the brightness of the pulp. The amount of optical Brightener is usually about 0.5 wt.% the number of produced paper. Preferably the amount of optical Brightener is approximately from 0.5 to 2 wt.%, more preferably from 0.75 to 1.75 wt.% and most preferably from about 1 to 1.5 wt.% on the above basis.

The number of OO powder in the composition for size press may vary within wide limits, and you can use any number. For example, the number of OO can be high, approximately 50% of the total weight of the composition. The number of OO is preferably high, accounting for approximately 25% of the total weight of the composition. More preferably, the number of OO in aqueous solution is from about 2 to 10%. Most preferably the number of OO in water is the first solution is from about 5%to 10%. It was determined that a 2% concentration of PA is optimal for visual purposes. In subsequent experiments, modifying the optical properties, used a higher concentration of the chemical substance. This may depend or not depend on the speed of the machine. Weight applied OO is at least about 0.7 wt.%. More preferably, the weight applied OO is at least about 0.9 wt.%. Most preferably, the base weight of OO is at least about 1.1 wt.%. OO is present mainly on the surface or near the surface of the paper or cardboard base. For example, the number of OO on the surface of paper or paperboard base can be greater than 90%.

A sizing composition may include other ingredients in addition to the starch and powdered optical Brightener. Such additional components include dispersants, fluorescent dyes, surfactants, deforming agents, preservatives, pigments, binders, chemicals to control pH, substances, releasing coating, etc.

A sizing composition can be manufactured by traditional methods by adding powder optical Brightener for starch sizing composition containing water and boiled starch. These JV the ways well known in the art, see, for example, "Handbook technologist pulp and paper industry", J. Hey. CMYK, 1982, TAPPI, and the specified reference literature, and will not be described here in detail.

A sizing composition may also be made of a sizing composition containing water, raw starch and powdered optical Brightener, by cooking this composition for the hydrogenation of starch in order to obtain compositions containing boiled starch and powdered optical Brightener. This method is preferred because of the ease of application, preparation and uniform distribution of OO. (Describes the benefits of applying OO powder versus liquid OO and benefits of adding powder OO to the starch slurry. Benefits of using OO powder versus liquid OO: reduced weight, increased stability, higher potential brightness and whiteness, reduced storage space).

In this preferred method, you can use the traditional ways of cooking starch. Full hydrogenation of molecules of starch and dispersing powder optical Brightener in a sizing composition requires four things: water, temperature, time and mixing. The amount of water required depends on the type of starch and how it is modified. For example, the starch may require cooking at 6% solids, t is given as starch for coating, modified to a high degree, may require cooking at 400% solids. Melting of solid particles is of great importance for the characteristics of the starch. If the level of solid particles is excessively high, the characteristics of starch worse. The shift is also of great importance for the complete dispersion of the starch granules and powder optical Brightener. When cooking at atmospheric conditions is necessary to maintain a high shear during the entire cooking process. The stage of the preparation of the composition is carried out at a temperature equal to or higher than about 115°F, or the stage of the preparation of the composition is carried out at temperatures up to and including about 299°F. a Large part of the starch begins to form a gel at a temperature of from 140 to 160°F. Vysokopotentsirovannye starch begins to form a gel at a temperature of 115°F. Some cross-linked starches require elevated temperatures inkjet digester, for example up to 195°F and above. Starch prepared at atmospheric pressure, may require a cooking time of 20 to 30 minutes, while boiling occurs instantly when using inkjet or thermal/chemical methods.

Converting enzymes. The method of conversion enzymes lies in the manufacture of pulp from the water and starch when the desired amount of solid particles and the regulation of pH to the recommended value is Oia. This slurry is stirred and heated at a programmed temperature rises to approximately 170°F. After holding at this temperature is usually within about 30 minutes the temperature is quickly raised to 195°F. This temperature is usually enough to "fix" enzymes for 15-30 minutes Then the material is cooled to the desired temperature.

The most common ways of cooking are atmospheric or periodic, enzymatic, inkjet and thermal/chemical. When periodic and continuous enzymatic cooking preferred strict control of several key factors. These include the speed of temperature rise, the time and viscosity. These factors require strict regulation in order to obtain reproducible and consistent results.

Thermal conversion and jet cooking. Jet cooking is the preferred method of hydrogenation of starch, and continuous digesters known for many years. High temperature, pressure and high shear achieve through the use of redundant pair. This method gives significantly lower the viscosity of the starch in comparison with atmospheric cooking. Starch paste obtained inkjet cooking, has the following advantages: (1) cost reduction, (2) automated cooking process, (3) u is Naya viscosity and (4) complete hydrogenation of molecules of starch.

Paper and cardboard bases used in the practical implementation of the present invention, may vary within wide limits. Such paper and cardboard bases, as well as methods and devices for their production are widely known in the art. See, for example, "Handbook technologist pulp and paper industry", 2nd edition, J. Hey. CMYK, Angus Wilde Publications (1992), and specified reference materials, which are incorporated herein in full by reference. For example, a paper or cardboard sheet can be made from cellulose fibers derived from hardwood trees, softwood trees, or a combination of deciduous and coniferous trees for use in compositions for making paper by any known methods of cooking, refining and bleaching, for example, the well-known mechanical, thermomechanical, chemical and poluchilisi and other well-known methods for producing pulp. In some embodiments, the implementation of at least part of the cellulose fibers can be obtained from non-woody herbaceous plants, including, 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. In this way what about the invention can be used as bleached, and unbleached cellulose fibers. Also you will want to use the secondary fiber pulp. In a preferred embodiment, the cellulose fibres in the paper or the corresponding canvas approximately from 0% to 100% by dry weight softwood fibers and from about 100% to 0% by dry weight of hardwood fibers.

In preferred embodiments of the invention in addition to the cellulose fibers of paper or cardboard can also include various additional ingredients known for use in the manufacture of paper, including optical Brightener, such as described above, dispersed expanded or expandable particles of synthetic resins having a common spherical center containing liquid hydrocarbon, starch, mineral fillers, inorganic salts such as sodium chloride, internal sizing agents, dyes, tools, retention, shopruche resin, and the reinforcing polymers, etc.

Density, basis weight and thickness of paper or cardboard canvases of the present invention can vary within wide limits. For example, can be any conventional base mass, density and thickness depending on the paper product formed from a cloth.

Brightness TAPPI paper or cardboard bases can vary in a wide the limits. For example, the desired brightness TAPPI paper or cardboard base can be low (75) and high (96). Brightness TAPPI paper or cardboard bases preferably equal to or greater than 90, more preferably equal to or greater than about 95, and most preferably equal to or greater than about 92. In the best options for implementation of the TAPPI brightness of paper or paperboard is from about 90 to 94. The CIE whiteness of the paper or cardboard bases may vary within wide limits. The CIE whiteness is preferably at least about 85, more preferably is at least about 130, and most preferably from about 100 to 125. The CIE whiteness is preferably at least about 110, more preferably is at least about 120. Unexpectedly it was found that in preferred embodiments of the invention, the difference in the upper level of brightness of paper or paperboard, made by the method of the present invention, and the traditional use of optical brighteners in the sizing press is greater than the brightness TAPPI Foundation. For this reason, the preferred high intensity basis. The desired brightness TAPPI paper or cardboard bases can be obtained using traditional methods, as e.g. the, by additional bleaching and/or by adding an optical Brightener in the canvas.

Methods and devices for treatment of a cloth, paper or paperboard sizing composition are well known in the manufacture of paper and cardboard. See, for example, "Handbook technologist pulp and paper industry", 2nd edition, J. Hey. CMYK, Angus Wilde Publications (1992), and specified reference material. You can use any traditional methods and device sizing. Therefore, these methods and devices will not be described here in detail. For example, a sizing composition may be applied in the size press, which may be any equipment for coating or spray coating, but is most often used in the size press with rollers and drip tray washing liquid or the size press with dosing.

Paper or cardboard and the fabric is dried after processing a sizing composition. Methods and devices for drying paper or cardboard canvases treated with a sizing composition, are well known in the manufacture of paper and cardboard. See, for example, the publication of J. Hey. The CMYK above, and the reference materials. You can use any traditional methods and devices for drying. Therefore, these methods and devices are not brutopia in detail here. After drying, the paper may pass through one or more stages, which are indicated, for example, in the publication J. Hey. The CMYK mentioned above and indicated in her promotional materials. For example, on a paper or cardboard sheet can be coated, it can Kalankatuatsi to achieve the desired end thickness to improve the smoothness and other properties of the canvas. Calendering can be carried out between steel rolls at a pressure in the contact zone, sufficient to achieve the required thickness. It will be clear that the final thickness of the paper will be largely determined by the choice of pressure in the contact zone.

In preferred embodiments, the implementation of paper and cardboard have a higher level of brightness TAPPI than paper and paperboard, in which the liquid optical Brightener added to the cooked starch or cooked together with starch, and get the sizing composition deposited on the base in the sizing press. The increase in the upper brightness level preferably at least about 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% and 30% more than paper or paperboard, in which the liquid optical Brightener added to the cooked starch or cooked together with starch, and obtained a sizing composition applied on the basis of size the press, including all ranges and subranges within these limits. The increase in the upper levels of brightness more preferably at least about 5%-10% more, and most preferably at least about 5%-10% more top level of brightness of paper and cardboard, in which the liquid optical Brightener added to the cooked starch or cooked together with starch, and get the sizing composition deposited on the base in the sizing press.

In preferred embodiments, the implementation of paper and cardboard have a higher level of whiteness CIE than paper and cardboard, in which the liquid optical Brightener added to the cooked starch or cooked together with starch, and get the sizing composition deposited on the base in the sizing press. The increase in the upper level of whiteness CIE preferably at least about 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% and 30% more than the upper level of the CIE whiteness in paper and cardboard, in which the liquid optical Brightener added to the cooked starch or cooked together with starch, and get the sizing composition deposited on the base in the sizing press. The increase in upper-level white more preferably at least about 5%-10% greater and most preferably by less than the least about 5%-10% more top level of the CIE whiteness of the paper and cardboard in which the liquid optical Brightener added to the cooked starch or cooked together with starch, and get the sizing composition deposited on the base in the sizing press.

Differences in the increase of upper limit brightness increase with an increase in brightness TAPPI Foundation. Preferably, the initial brightness TAPPI basics before processing method of the present invention was at least about 90, more preferably at least about 92, and most preferably from about 93. In the best options for implementation of the initial brightness TAPPI basics before processing method of the present invention is at least about 94, 95 or 96.

Differences in the increase of the upper limit of CIE whiteness increase with an increase in brightness TAPPI Foundation. Preferably, the initial white CE basics before processing method of the present invention was at least about 85, more preferably at least about 130, and most preferably from about 100 to 125. White CE is preferably at least about 110, more preferably is at least about 120.

Paper and paperboard, made in accordance with the present invention, can be used to Tr the traditional goals. For example, a paper suitable for publication, packaging, etc.

The following specific examples are intended to illustrate the invention in detail and are not intended to interpret as its limit.

Example 1

(A) Preparation of compositions for size press with the addition of pre-prepared optical brighteners (PA)

There was prepared a series of applications of starch on the surface using the following order of operations. Starch was prepared in the laboratory jet digester. A number OO added into the container with starch slurry together with a certain amount of dry ethyl starch. Added water to obtain a solids content in the slurry ~18% (by weight of the total composition), and the slurry was cooked at 299°F in the jet digester. Starch is diluted to the desired solids content for this application is from 13 to 16% depending on how the viscosity of this system is suitable for use in the sizing press and desirable grip. Composition and technical characteristics of the solutions of starch are shown in table 1.

Table 1
Song OO for size press (add before cooking)
TrackThe form OOType OOLeaded starch, gPowder OO, gTotal volume (l)The solids content OO/total solids(%)
1S-1-1963-10-
1PowderHexa2196330,91101,55
2PowderHexa2196361,81103,05
3PowderHexa22944to 150.1124,85
4PowderTetra3 196330,91101,55
5PowderTetra3196361,81103,05
6PowderTetra31963120,1124,85
1”C” indicates that the composition is a composition for comparison.
2”Hexa” means hexacontane stilbene obtained from the company Daikaffil Chemical under the brand name Dikaphor BSU.
3"Tetra" means tetrasulfonated stilbene obtained from the company Aakash under the firm name of SI 220.

(C) Preparation of compositions for size press with the addition of optical Brightener after cooking

There was prepared a series of applications of starch on the surface using the following order of operations. Starch was prepared as a gruel of 3532 g leaded starch in 18 liters of water and boiled is it at 299°F in a laboratory jet digester. A number OO added into the container with starch slurry together with a certain amount of dry ethyl starch. Added water to obtain a solids content in the slurry ~18% (by weight of the total composition), and the slurry was cooked at 299°F in the jet digester. Starch is diluted to the desired solids content for this application is from 13 to 16% depending on how the viscosity of this system is suitable for use in the sizing press and desirable grip. The composition of the liquid OO and starch was prepared by adding a commercially available liquid hexa-OO to cooked starch. Composition and technical characteristics of the solutions of starch are shown in table 2.

Table 2
Compositions for size press (add after cooking)
Composition with starchType OOLeaded starch, gLiquid OO, g (as received)Liquid OO, g (dry*)Total volume (l)The solids content OO /total solids, %
C-2G the KSA 2643,5304,659,717,957of 2.21
C-3Hexa2557,5533,4104,616,8863,92
C-4Hexa2436,3772,9USD 151.616,462of 5.83
C-5Hexa2349,3974,6191,115,3417,47
* The mass in grams of dry OO was calculated by dividing OO as received on the basis of the analysis liquid chromatography high pressure and NMR analysis of the relative content of OO in powder and liquid products.

(C) Preparation of paper processed in a sizing press in laboratory conditions

1. Preparation of the base

The basis used in this experiment was made on a paper machine from a composition containing 60% of filaments is softwood and 40% hardwood fibers, and 12% clay filler in acidic conditions. Basis weight the basis of the paper was approximately 116 g/m2and directed the TAPPI brightness and CIE whiteness was 77,7 and 68,9 respectively.

2. Processing in the sizing press

For applying starch composition on the surface of the roll paper width of 12 inches was continuously applied between the two shafts and starch composition was pumped into the tank of the contact zone, and the paper was passed through the reservoir zone of contact with the preset speed. By controlling the content of solid particles, the pressure in the contact zone and the speed of passage through the size press was achieved total weight of the capture of 3.8-4.5 g/m2.

Basics processed in the sizing press, and their specifications are given in table 3.

6,54
Table 3
Basics processed in the sizing press
A sizing compositionThe form OOType OOThe total coating, g/cmStarch, g/cmOO, g/cm
S-1--6,54-
1PowderHexa6,446,340,10
2PowderHexa6,055,860,18
3PowderHexaof 6.686,350,32
4PowderTetra6,296,200,10
5PowderTetra5,955,770,18
6PowderTetra5,97of 5.680,29
C-2Liquid Hexa6,506,360,14
C-3LiquidHexa6,396,140,25
C-4LiquidHexa6,996,590,41
C-5LiquidHexa6,856,340,51

Aimed brightness TARR was measured using a testing method TAPPI T-452. The CIE whiteness was measured according to ISO 11475. The evaluation results are shown in table 4.

Table 4
Directional brightness TARR and white CIE
Starch compositionDirectional brightness TAPPIThe CIE whiteness, D65
S-177,768,94
1 81,4101,68
282,8112,80
3of 83.4117,90
481,9104,21
582,8111,63
682,7112,43
C-281,6104,30
C-382,5111,78
C-483,1116,96
C-583,2119,68

Example 2

(D) Preparation of compositions for size press with the addition of pre-cooked OO

There was prepared a series of applications of starch on the surface using the following order of operations. The starch was cooked in a digester of periodic action. A number OO powder added into the container with starch slurry together with a certain amount of dry okislennogo the starch. Added water to obtain a total solids content in the slurry ~16%, and the slurry was cooked at 200°F for 20 minutes, the Starch is diluted to the desired solids content for this application is from 14 to 14.5% depending on how the viscosity of this system is suitable for use in the sizing press and desirable grip. Composition and technical characteristics of the solutions of starch are shown in table 5.

Table 5
The size press composition for powder OO (add pre-cooked OO)
Composition for size pressType OOOxidized starch, gPowder OO, gTotal volume (l)The solids content OO/total solids (%)
7Hexa3178122,419,13,71
8Hexa3178203,719,6 6,02
9Hexa3178285,120,08,23

(E) Preparation of compositions for size press with the addition of OO after cooking

There was prepared a series of applications of starch on the surface using the following order of operations. The starch was cooked in a jet digester. Some amount of liquid OO added into the container with starch slurry together with a certain amount of dry oxidized starch. Added water to obtain a solids content in the slurry ~18% (by weight of the total composition), and the slurry was cooked at 270°F in the jet digester. Starch is diluted to the desired solids content for this application approximately 14.5%Kompozizii of liquid OO and starch solution was prepared by adding a commercially available liquid OO to cooked starch. Composition and technical characteristics are given in table 6.

Table 6
Compositions for size press (add after cooking)
Starch compositionType OO Oxidized starch, gLiquid OO, g (as received)Liquid OO, g (dry*)Total volume (l)The solids content OO/total solids (%)
S-6Hexa3178317,862,3121,41,89
C-7Hexa3178953,4186,9422,95,32
S-8Hexa31781589311,5724,3to 8.34
*The mass in grams of dry OO was calculated by dividing OO as received on the basis of the analysis liquid chromatography high pressure and NMR analysis of the relative content of OO in powder and liquid products.

(F) Preparation of processed paper on experimental sizing press

1. Preparation of the base

The basis used in this experiment is, was manufactured on a paper machine from a composition containing 80% softwood fibers and 20% hardwood fibers and 20% filler is calcium carbonate in alkaline conditions. Basis weight the basis of the paper was approximately 116 g/m2and directed the TAPPI brightness and CIE whiteness was 94,6 and 115,80 respectively.

2. Processing in the sizing press

For applying starch composition on the surface of the roll paper width of 14 inches was continuously applied between the two shafts and starch composition was applied as a film on the rollers, and the paper was passed through the shaft with a preset speed. By controlling the content of solid particles, the pressure in the contact zone and the speed of passage through the size press was achieved total weight of the capture of 2.3-3.4 g/m2.

Basics processed in the sizing press, and their specifications are given in table 7.

Table 7
Basics processed in the sizing press
Starch compositionThe form OOType OOThe total coating on one side, g/cmBrahma the on side g/cmOO on the side, g/cm
7PowderHexa3,2is 3.080,12
8PowderHexa3,33,100,20
9PowderHexa3,12,840,26
S-6LiquidHexa3,43,340,06
C-7LiquidHexa2,32,180,12
S-8LiquidHexa3,43,120,28

Aimed brightness TARR was measured using a testing method TAPPI T-452. Whiteness CIE measured is about to ISO 11475. The evaluation results are shown in table 8.

Table 8
Directional brightness TARR and white CIE
Starch compositionDirectional brightness TARRThe CIE whiteness, D65
797,4141,74
897,9144,69
9of 98.2146,41
S-696,3134,51
C-797,2140,47
S-897,6143,16

1. Method for the production of paper and cardboard products containing
forming a composition containing water, raw starch and powdered optical Brightener;
the cooking composition for forming the finished composition containing boiled starch and powdered optical Brightener;
the application of the finished composition on at least one surface is paper or cardboard bases in the sizing press in the method of manufacturing paper or cardboard to obtain sized paper or paperboard substrate and
drying of the sized paper or paperboard basis to obtain dried and glued paper or cardboard base.

2. The method according to claim 1, where the finished sizing composition contains solid particles in amount from about 8% to 21% by weight of the total composition.

3. The method according to claim 1, where the raw starch is selected from the group consisting of ethyl starch, oxidized starch, starch grains, and combinations of two or more of the mentioned types, and raw starch is in an amount of from about 60 to 90% by weight of the total composition.

4. The method according to claim 1, where the powder optical Brightener is in the amount of approximately from 2 to 10% by weight of the total composition, and the powder optical Brightener is an optical Brightener based hexadentate stilbene or powder optical Brightener is an optical Brightener based tetrasulfonated stilbene.

5. The method according to claim 1, where the stage of the preparation of the composition is carried out at a temperature equal to or higher than about 115°F, or the stage of the preparation of the composition is carried out at temperatures up to and including approximately 299°F, and
the stage of the preparation of the composition is carried out in the presence of the enzyme, or
the stage of the preparation of the composition is conducted as a periodic process, or
the stage of the preparation of the composition as a fluid process of cooking.

6. The method according to claim 1, where wysu the military and glued paper or cardboard base has an upper brightness level of about 2-30% more than the upper level of brightness of paper or cardboard, in which the raw liquid optical Brightener added to the cooked starch, or dried and glued paper or cardboard base has a top level of whiteness CIE approximately 2-30% more than the upper level of white paper or cardboard, in which the raw liquid optical Brightener added to the cooked starch.

7. Method for the production of paper or cardboard products containing
forming a composition containing water, raw starch and powdered optical Brightener;
the cooking composition at temperatures up to and including 299°F to get ready a sizing composition containing boiled starch and powdered optical Brightener;
the application of the finished composition on at least one surface of the paper or cardboard bases in the sizing press in the method of manufacturing paper or cardboard to obtain sized paper or paperboard substrate and
drying of the sized paper or paperboard basis for the dried and sized paper or paperboard substrate.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention describes an aqueous dispersion of an optical bleaching agent which is stable during storage, does not contain dispersants and stabilisers and contains 20-40% active substance in form of one or more optical bleaching agents obtained through successive reaction of cyanuric chloride with 4,4'-diamino-2,2'- stilbene sulphonic acid, amine and a product of reacting monoethanol amine with acrylamide.

EFFECT: disclosed dispersion of optical bleaching agent does not require dispersants or other stabilising additives to prevent settling during storage and has excellent properties for bleaching paper and other cellulose materials.

8 cl, 2 tbl, 4 ex

FIELD: paper industry.

SUBSTANCE: methods refer to manufacturing of bleached cellulose material, prevention of yellowing and loss of whiteness in bleached craft-cellulose, and manufacturing of paper goods. In process of bleached cellulose material manufacturing, bleached craft-cellulose is produced and exposed to contact with sufficient amount of more or several reducing agents. Additionally bleached craft-cellulose is exposed to contact with one or several optical bleach, with one or more chelating agent. Method for prevention of yellowing and loss of whiteness of bleached craft-cellulose in storage includes addition of efficient amount of one or more reducing agent into bleached cellulose and possibly one or more chelating agent, one or more polycarboxylate or their combinations. Method for production of paper goods includes production of bleached craft-cellulose, formation of initial water suspension from it, water drainage with formation of sheet and sheet drying. Besides efficient amount of one or more reducing agent is added into bleached craft-cellulose, initial suspension or sheet. Additionally one or more chelating agent is added there, one or more optical bleach, one or more polycarboxylate, or their combination.

EFFECT: improved quality of paper goods, increased stabilisation of whiteness and increased resistance to yellowing in process of paper production and to thermal yellowing, improved colour pattern.

17 cl, 33 tbl

FIELD: textile, paper.

SUBSTANCE: procedure refers to production of wood pulp and can be implemented in pulp-and-paper industry. The procedure consists in whitening fibres of sulphate pulp with a whitening agent on base of chlorine and in washing whitened fibres of sulphate pulp. Upon washing fibres of sulphate pulp are subject to interaction with at least one optic whitener before mixing ponds. Interacting is carried out in solution at pH from 3.5 to 8.0 and temperature from 60 to 80°C during 0.5-6 hours. The invention also refers to wood pulp produced by the said procedure.

EFFECT: increased whiteness and optic brightness of paper at decreased utilisation of optic whitener.

22 cl, 11 dwg, 11 tbl, 7 ex

FIELD: chemistry.

SUBSTANCE: invention relates to concentrated aqueous solutions of hexa-sulfonated stilbene used optical brighteners. Description is given of an aqueous solution of hexa-sulfonated stilbene optical brightener which is stable during storage with over 0.214 mol/kg content thereof in the solution. The solution does not contain a soluble agent, for example urea. By removing salts formed during synthesis of the optical brightener, its concentration of up to 0.35 mol/kg can be achieved without losing stability during storage. Also described is a method of preparing an aqueous solution of the said optical brightener and its use for bleaching paper or cellulose materials.

EFFECT: high concentration solutions of the said optical brightener do not show crystallisation signs after 2 weeks at 5°C and enables formation of coating compositions with low water content, which reduces energy consumption on drying and reduces penetration of water and adhesive into the paper layer.

10 cl, 1 dwg, 1 tbl, 3 ex

FIELD: textile fabrics, paper.

SUBSTANCE: aqueous solutions are related to toluylene optical bleaches and may be used in production of chalk overlay paper of high whiteness. Aqueous solutions contain at least one optical bleach, polyvinyl alcohol, having extent of hydrolysis over 75% and Brookfield viscosity of 2-40 mPa·s, and water. This composition may be used for paper coating. It may be applied on paper after its moulding to produce chalk overlay paper.

EFFECT: provision of stability in storage of aqueous solutions of toluylene optical bleaches and simplified method for production of chalk overlay paper.

9 cl, 3 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: described is a composition, containing (A) 2 to 30 wt % composition of amino alcohol - 2-amino-2-methyl-1-propanol with formula (1), and (B) 70 to 98 wt % composition of fluorescent optical bleaching agent with formula (2) , where X - is hydrogen, ion of alkali metal or ammonium, or hydroxyalkylammonium radical, derived from amino alcohol (1); R7, R8, R9 and R10 - -OR11, -NR11R12 or , where R11 and R12 - is hydrogen, alkyl, hydroxyalkyl, alkoxyalkyl, carboxyalkyl, dicarboxyalkyl, H2N-CO-alkyl or alkylthio group.

EFFECT: high solubility in water and increased stability when storing its aqueous solutions.

4 cl, 3 tbl, 3 ex

FIELD: chemistry, textiles, paper.

SUBSTANCE: present invention relates to new amphoteric bis-triazinylaminostilbene fluorescent whitening agents for fluorescent whitening of organic materials, particularly paper. Description is given of use of compounds with formula (5) for fluorescent whitening of paper.

EFFECT: compounds have high bleaching power; fluorescence is not prevented by cation-active polymers or anion-active fluorescent whitening agents contained in the paper.

2 cl, 2 tbl, 48 ex

FIELD: chemistry.

SUBSTANCE: invention concerns fluorescent bleach containing a mix of two asymmetrically substituted and one symmetrically substituted triazinylaminostilbene disulfone acid, a new symmetrically substituted derivative, method of their obtaining, and application of the mix in synthetic or natural organic material (especially paper) bleaching and in fluorescent bleaching and sun resistance boost of textile.

EFFECT: high substantivity and light resistance of the claimed fluorescent bleaches and their mixes, and better water solubility of the claimed mixes in comparison to the solubility of each individual bleach.

15 cl, 2 tbl, 12 ex

FIELD: organic chemistry, paper industry.

SUBSTANCE: invention relates to compositions used for coating paper covers. Invention describes a composition for coating paper cover comprising whitening pigment comprising: (a) product of melamine formaldehyde or phenol-formaldehyde polycondensation, and (b) water-soluble fluorescent whitening agent of the formula:

wherein R1 and R2 represent independently of one another -OH, -Cl, -NH2, -O-(C1-C4)-alkyl, -O-aryl, -NH-(C1-C4)-alkyl, -N-(C1-C4-alkyl)2, -N-(C1-C4)-alkyl-(C1-C4-hydroxyalkyl)- -N-(C1-C4-hydroxyalkyl)2 or -NH-aryl, for example, anilino-, anilinemono- or disulfonic acid or aniline sulfone amide, morpholino-, -S-(C1-C4)-alkyl(aryl) or radical of amino acid, for example, aspartic acid or iminoacetic acid that is replaced with radical in amino-group; M means hydrogen, sodium, potassium, calcium, magnesium atom or ammonium, mono-, di-, tri- or tetra-(C1-C4)-alkylammonium, mono-, di- or tri-(C1-C4)-hydroxyalkylammonium, or ammonium di- or tri-substituted with a mixture of (C1-C4)-alkyl and (C1-C4)-hydroxyalkyl groups. Covers prepared on coating paper elicit high photostability and enhanced whiteness degree.

EFFECT: improved method for preparing, improved properties of covers.

7 cl, 1 tbl, 3 ex

FIELD: paper-and-pulp industry.

SUBSTANCE: formulation includes optic bleacher and low-viscosity water-soluble nonionic polysaccharide derivative, whose 5% aqueous solution exhibits at ambient temperature Brookfield viscosity below about 1500 cP.

EFFECT: increased brightness of coated paper.

34 cl, 9 tbl, 2 ex

FIELD: paper industry.

SUBSTANCE: paper with improved rigidity and bulk and method of its manufacturing may be used in pulp and paper industry and are intended for photocopier equipment. Paper comprises three-layer double-tee structure that forms a single web. It has central core layer manufactured mainly from cellulose, bulk of which is increased with the help of filler, such as hydrazine salt. Starch-based coating is applied on both sides of core layer, at the same time starch has high content of solid products. Coating forms three-layer paper having composite structure with outer layers of high strength that surround core of low density.

EFFECT: improved strength, rigidity and resistance to twisting of produced material.

32 cl, 2 dwg, 3 tbl, 3 ex

FIELD: textiles, paper.

SUBSTANCE: paper or cardboard of improved rigidity and bulk are meant for reproducing equipment and the method refers to production of the said paper and cardboard. The paper or cardboard has the core layer and starch-based layers applied by gluing-up on its both sides forming the uniform canvas of the double-T structure. The layers cover the upper and the lower surface of the central layer with minimal penetration to the central layer. The starch contains the filler spreading to the central layer. The starch has high content of solid products. The mass of the coating layers is 2-10 g/m2. Method for producing paper or cardboard includes the following stages: a) creation of composition containing cellulose fibers and the filler, b) formation of fibrous canvas, c) drying of the fibrous canvas, d) processing by gluing-up both sides of the dried canvas with the starch with filler and e) drying of the fibrous canvas with formation of the three-layer making the uniform canvas material with the double-T structure.

EFFECT: increased quality of paper or cardboard due to increased smoothness, decreased hygroscopic expansivity, improved fold resistance and paper rolling resistance.

30 cl, 2 dwg, 3 tbl, 3 ex

FIELD: textiles; paper.

SUBSTANCE: composition is designed for refining fibrous material, can be used in the production of enamelled cardboard and paper and relates to the cellulose-paper industry. The composition contains a modified pigment and a water soluble binding substance. The pigment is calcium sulfoaluminate, modified starch or polyvinyl alcohol with mass ratio content of 0.5-1.5. The water soluble binding substance is starch.

EFFECT: resistance to fluffing and whiteness of the coating with considerable lowering of consumption of the binding substance when making the composition.

1 tbl

FIELD: textiles, paper.

SUBSTANCE: solution is meant for rifining of fibrous material. It pertains to the field of paper manufacturing and cardboard during manufacturing of chalk-overlay types of cardboard and paper. The solution consists of water soluble binder. A mixture of calcium salfoaluminate and kaolin, modified starch or polyvinyl spirit is used as the pigment. The technical result is high stability to picking, whiteness, colour perception and smoothness. The solution enhances adhesion of the coating to the base (cardboard or paper), which makes it possible to use the refined coating as a sub-layer when dual or tri-coating cardboard or paper, with obtaining products with a given range of characteristics.

EFFECT: obtaining of a solution for refining material for production of paper and cardboard during production of chalk-overlay types of cardboard and paper.

1 tbl, 1 exr

FIELD: pulp and paper industry; methods of production of the pigment for manufacture of the cardboard and paper.

SUBSTANCE: the invention is pertaining to the method of production of the pigment for manufacture of the cardboard and paper and may be used in pulp and paper industry at production of the filled paper, the coated paper and the cardboard. Calcium carbonate is treated with aluminum sulfate in the aqueous medium. The treatment is conducted at aluminum sulfate consumption of 25-105 % to the mass of absolutely dry calcium carbonate at the temperature of 80-85°С during 90-180 minutes with production of the suspension containing 25-35 % dry substances in it. At that they use the aqueous medium containing the binding chosen from the group, which includes starch and polyvinyl alcohol in the amount of 0.5-3.0 mass % from the mass of the absolutely dry pigment, and-or the water soluble colorant in the amount of 0.1-0.5 mass % from the mass of the absolutely dry pigment. The suspension is additionally dried and grinded. The technical result of the invention is the improved quality of the pigment as well as expansion of its field of application.

EFFECT: the invention ensures the improved quality of the pigment as well as expansion of its field of application.

2 tbl

FIELD: pulp and paper industry; methods of production of the pigment for manufacture of the cardboard and paper.

SUBSTANCE: the invention is pertaining to the method of production of the pigment for manufacture of the cardboard and paper and may be used in pulp and paper industry at production of the filled paper, the coated paper and the cardboard. In the water at intense stirring feed powders of calcium hydrate and calcium carbonate at the ratio of the indicated components accordingly from 1.0:2.2 up to 1.0:12.9. The produced suspension is gradually added with aluminum sulfate at its ratio to the total mass of the calcium hydroxide and calcium carbonate from 1.0:0.85 up to 1.0:4.30. Then the temperature of the mixture is increased up to 8О-85°С and the produced reaction mixture is kept at stirring within 90-180 minutes with formation of the dispersion of the pigment with the share of the dry substances in it equal to 20-35 %. Then the dispersion is dried and grinded into the powder. The powder is dispersed in the water containing the given amount of the dissolved coolant and-or binding - starch or polyvinyl alcohol. The technical result of the invention production of the pigment with the new properties, that allow to expand the field of its application at manufacture of various types of the cardboard and the paper.

EFFECT: the invention ensures production of the pigment with the new properties, expansion of the field of its application at manufacture of various types of the cardboard and the paper.

2 tbl

FIELD: manufacture of a tub-sized paper or board sheet, applicable in wood-pulp and paper industry.

SUBSTANCE: the method consists in application at least on one side of the sheet of an aqueous compound of adhesive substance in amounts not exceeding 5 g/cu.m. The content of the solid substance in the applied adhesive compound makes up at least 15%. The aqueous compound is applied on one side of the sheet after its drying in a drying section of the machine for manufacture of paper or board. After that the adhesive compound is embedded in the sheet surface.

EFFECT: reduced power of the drying section of the machine for manufacture of paper or board and provided reduction of investments and reduction of the length of the paper-making line.

9 cl

FIELD: paper-and-pulp industry.

SUBSTANCE: invention relates to pigment, which can be used in manufacture of paper with filler, coated paper, and cardboard. Calcium hydroxide and calcium carbonate powders taken in proportion between 1.0:2.2 and 1.0:23.5 are added to vigorously stirred water, after which temperature of mixture is raised to 80-85°C and resulting reaction mixture is kept being stirred for 90-180 min to form dispersion of pigment containing 20-35% solids.

EFFECT: improved quality of pigment at lower cost and extended application area.

3 tbl

FIELD: paper-and-pulp industry.

SUBSTANCE: formulation includes optic bleacher and low-viscosity water-soluble nonionic polysaccharide derivative, whose 5% aqueous solution exhibits at ambient temperature Brookfield viscosity below about 1500 cP.

EFFECT: increased brightness of coated paper.

34 cl, 9 tbl, 2 ex

Finishing agent // 2160805

FIELD: fabrics, paper.

SUBSTANCE: invention is related to glossy chalk overlay universal paper for printing, which may be used in wide range of office equipment for printing, including jet and electrophotographic printing, to method of chalk overlay paper making. Chalk overlay paper contains paper web and pigment composition applied onto at least one surface of web. Specified composition of pigment coat comprises the first pigment with specific surface BET in the range from approximately 50 to 750 m2/g; the second pigment with specific surface BET in the range of approximately from 5 to 49 m2/g; and polymer binder. Besides specified chalk overlay paper has glossiness of coat equal to or more than approximately 30% at the angle of 75° and length of absorption Bristow less than approximately 180 mm.

EFFECT: paper has superb properties of ink absorption, toner fixation and provides for obtaining the imprint of high quality.

10 cl, 3 dwg, 15 tbl, 8 ex

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