Method for paper production

FIELD: paper.

SUBSTANCE: paper base contains fibers of coniferous and deciduous wood, or their mixtures, which have average length that is more or equal to 75 mcm and have filler fixed to part of these fibers, and also less than 50 wt % of fibers have average length less than 75 mcm from total weight of base. Paper mass is produced by contact of deciduous or coniferous wood fibers or their mixtures having average length of 75 mcm and having filler fixed to part of mentioned fibers, with fibers average length of which is less than 75 mcm, from total weight of base.

EFFECT: improved smoothness of paper.

20 cl, 25 dwg, 3 tbl, 3 ex

 

This application claims under 35 U.S.C. § 119(e) of the priority of provisional patent application U.S. 60/587,954, which is incorporated herein in full by reference.

The technical field

The present invention relates to a paper or paperboard base containing complexes "fiber-filler", as well as to methods of manufacture and use.

The level of technology

As fillers in the manufacture of paper are widely used inorganic materials such as precipitated calcium carbonate, ground calcium carbonate, clay and talc. Levels of filler 12-25 wt.% typical current strategy paper industry to improve the optical properties of paper, such as whiteness and opacity. In some cases, an additional aspect is the cost to replace the expensive fiber is cheap filler.

To ensure the retention of fillers in fiber cloth and ultimately in paper products used means of restraint. Usually means deductions are polymeric compounds with long chains that flocculent in paper composition and increase the adhesion of the filler to the fiber. However, high levels of flocculation, partly caused by means of deduction lead to uneven fabric and non-uniform thickness Boo is AGI.

To avoid this, the method of coupling the filler directly to the surfaces of the fibers has been described in French patent 92-04474 and U.S. patent No. 5,731,080 and 5,824,364 issued to Casino and others (Cousin et al.), which are incorporated herein in full by reference. In these patents the flow of paper compositions enriched to a low degree of grinding (less than 70 CSC (canadian standard degree) grinding against 450 KCC in normal cases) and then processed to obtain a set of "filler-fiber with high filler contents. After the re-unification of such complexes with raw fibrous mass can achieve any desired filler content.

An alternative approach is described in U.S. patent No. 5,679,220 issued Matthew and others (Matthew et al.), and U.S. patent No. 5,665,205, issued Srivatsa and others (Srivatsa et A1.), which are incorporated herein in full by reference. In the patents, Srivatsa and Matthew all paper composition is processed to the nominal content of the filler without exposure of the fibrous mass and higher levels of refinement (low degree of grinding). However, these methods lead to an increase in capital and operating costs due to the processing of large amounts of fibrous mass. Therefore, in the art there is a need to create complex is in the filler-fiber" easier and cheaper way.

In the art-known methods of production complexes "filler-fiber" by contact of the fibrous mass with slaked lime and gaseous carbon dioxide to precipitate calcium carbonate. Such methods are described in patents issued to Casino and others, Srivatsa, Matthew and other Patents Cesena and others describe a method of producing a composite based on fiber produced by deposition of calcium carbonate in place of the water suspension of fibers with increased surface area, having microfibers on their surface. The crystals precipitated calcium carbonate arranged essentially in clusters of granules directly grafted on microfibers without binding or means of restraint, so that the crystals cover microfibers reliable and rigid connection. Srivatsa and others have described the deposition on the second fibrous composition. In the patents of Cesena and others described a periodic reaction in the patents Matthew and others described a continuous process of formation of the complexes "fiber-filler".

Typically, when the processing of cellulose creates a large specific surface area, and fiber are additional places clutch. However, U.S. patent No. 6,592,712, which is incorporated herein in full by reference, provides a source of fibers with high specific surface is rnost without the need for additional refinement by obtaining fiber from process streams in the paper manufacturing process. However, used a stream of fibers with high specific surface and internal recirculation containing recycled fiber, also called "minor factions", very variable, as it contains the remains of noderivative filler and other materials used in the manufacture of paper, such as sizing agents, optical brighteners and dyes and pigments. These chemicals can cause problems in their subsequent use, such as damping of the residual sizing and manifestation of optical black levels when exposed to high pH values, such as those required for the early formation of precipitated calcium carbonate. In addition, the use vysokoperedelnyh threads containing "change"can lead to problems with the uniformity of the paper base made of such threads.

BRIEF description of the INVENTION

One aspect of the present invention is a paper base containing a set of fibers of hardwood, softwood, or mixtures thereof, which have an average length greater than or equal to 75 microns, and have a filler attached to the said set, and contains less than 50 wt.% fibers having an average length is at less than 75 microns, by weight of the total base. Fiber hardwood, softwood, or a mixture thereof may have a canadian standard grinding degree from 300 to 600, and can be primary fibers. Fibers having an average length of less than 75 microns, can be recycled fibers, recycled fibers, fiber waste, or mixtures thereof. Fibers having a length of less than 75 microns, can be present in an amount of from 0.1 to 20 wt.% by weight of the total base.

Another aspect of the present invention is a paper base containing a set of fibers of hardwood, softwood, or mixtures thereof, which have an average length greater than or equal to 75 microns, and have a filler attached to the said set, and contains less than 50 wt.% fibers having an average length of less than 75 microns, by weight of the total base, where the filler is present in an amount of from 1 to 30 wt.% by weight of the total base. The filler may be attached to fiber mass ratio of the filler-fiber" from 0.3 to 8. The filler may be precipitated. In addition, the filler may be a precipitated calcium carbonate. The filler may be at least one form selected from the group consisting of cubic, scalenohedron, diamond and aragonite particles. The filler has an average particle size of from 0.01 to 20 MK is.

Another aspect of the present invention is a method of making the paper base by contact of a certain number of fibers of hardwood, softwood, or mixtures thereof, which have an average length greater than or equal to 75 microns, and have a filler attached to the said set, and contains the majority of fibers having an average length of less than 75 microns, by weight of the total base.

Another aspect of the present invention is a method of making the paper base by simultaneous and/or sequential contact of a certain number of fibers of hardwood, softwood, or mixtures thereof, which have an average length greater than or equal to 75 microns, with Ca(OH)2and/or

CO2.

Another aspect of the present invention is a method of making the paper base by contact of a certain number of fibers of hardwood, softwood, or mixtures thereof, which have an average length greater than or equal to 75 microns, with CA(Oh)2for the formation of a slurry containing less than 5% solids.

Another aspect of the present invention is a method of making the paper base by contact of a certain number of fibers of hardwood, softwood, or mixtures thereof, which have an average length greater than or equal to 75 microns, with gazoo asnam CO 2before you contact mentioned many fibers with CA(Oh)2.

Another aspect of the present invention is a method of making the paper base by contact of a certain number of fibers of hardwood, softwood, or mixtures thereof, which have an average length greater than or equal to 75 microns, with CA(Oh)2and/or CO2simultaneously and/or sequentially with pH from 7.5 to 11.

Another aspect of the present invention is a method of making the paper base by contact of a certain number of fibers of hardwood, softwood, or mixtures thereof, which have an average length greater than or equal to 75 microns, with Ca(OH)2and/or CO2simultaneously and/or sequentially in a tubular reactor, and CO2is added to the reactor through many entry points.

Another aspect of the present invention is a method of making the paper base by contact of a certain number of fibers of hardwood, softwood, or mixtures thereof, which have an average length greater than or equal to 75 microns, with CA(Oh)2and/or CO2simultaneously and/or sequentially in a series of tanks with continuous mixing, and CO2is added to each of the tanks with continuous stirring consistently.

Another aspect of the present invention is the procedure of making the paper base by contact of a certain number of fibers hardwood, softwood or mixtures thereof, which have an average length greater than or equal to 75 μm, and fibers having an average length of less than 75 microns with CA(Oh)2and/or CO2simultaneously and/or sequentially, with CO2is added to each of the tanks with continuous stirring consistently.

BRIEF DESCRIPTION of DRAWINGS

Figure 1 - Graph of smoothness in Sheffield in units of Sheffield (SU) of the upper side of the paper base against the ash content in wt.% this paper base.

Figure 2 is a Graph of smoothness in Sheffield in units of Sheffield (SU), the bottom side of the paper base against the ash content in wt.% this paper base.

Figure 3 is a table comparing the illumination of the residual values OVA from the sample stream fine fractions of fibers SaveAll before and after reaction of the sample for the formation of complex fine particles of fibers SaveAll - filler".

Figure 4 is a diagram of the process in which applied several features of the present invention.

Figure 5 is a schematic representation of one possible implementation of the device for implementing the method of the present invention.

6 is a schematic representation of one possible implementation of the method, device for implementing the method of the present invention.

7 is a schematic diagram of one variant of the method of manufacture is of the complex fibre-filler" using reactor batch and sequential addition of CO 2in the reactor.

Fig is a schematic representation of one possible implementation of the method of manufacturing a complex fiber-filler" using multiple tanks with continuous mixing in the sequence.

Figure 9 is a comparison of the paper base as a function of the morphology of the deposited filler.

Figure 10 is a snapshot of a scanning electron microscope, showing the morphology results for the tubular reactor.

11 is the first image of a scanning electron microscope, showing the morphology results for a reactor with continuous stirring.

Fig is the second image of a scanning electron microscope, showing the morphology results for a reactor with continuous stirring.

Fig is the first image of a scanning electron microscope, showing a cubic morphology.

Fig is the second image of a scanning electron microscope, showing a cubic morphology.

Fig is the third image of a scanning electron microscope, showing a cubic morphology.

Fig is the fourth image of a scanning electron microscope, showing a cubic morphology.

Fig is a graph of time sizing (HST) against the percentage of Saidenov is calcium carbonate.

Fig is a graph of modulus versus the percentage of precipitated calcium carbonate.

Fig is a graph of internal strength plucking against the percentage of precipitated calcium carbonate.

Fig is a graph geometric mean breaking length versus the percentage of precipitated calcium carbonate.

Fig is a graph geometric mean stiffness Taber on against the percentage of precipitated calcium carbonate.

Fig is a graph of gloss in ultraviolet radiation against the percentage of precipitated calcium carbonate.

Fig is a graph of gloss without ultraviolet radiation against the percentage of precipitated calcium carbonate.

Fig is a graph of fluorescence (Delta gloss) against the percentage of precipitated calcium carbonate.

Fig is the best embodiment of the method of manufacturing a complex fiber-filler".

A DETAILED DESCRIPTION of the BEST embodiment of the INVENTION

The inventors have discovered a method of manufacturing paper or cardboard bases containing complexes fiber-filler", and the method of their manufacture, which solves all the above problems found when using conventional paper basics and methods.

B. the per base contains a fabric of cellulose fibers. The paper base of the present invention may contain recycled fiber and/or primary fiber. Recycled fiber is different from the primary fibers of the fact that recycled fiber several times passed the drying process.

The paper base of the present invention may contain from 1 to 99 wt.%, preferably from 5 to 95 wt.%, most preferably 60 to 80 wt.% cellulose fibres by weight of the total basis, including 1, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95 and 99 wt.% and including all ranges and sub-ranges of these values.

Preferably, the source of cellulose fibers is wood of deciduous and coniferous trees. The paper base of the present invention may contain from 1 to 99 wt.%, preferably from 5 to 95 wt.%, cellulose fibers from coniferous trees from the total amount of cellulose fibers in a paper basis. This range includes 1, 2, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95 and 100 wt.%, including all ranges and sub-ranges of these values from the total amount of cellulose fibers in a paper basis.

The paper base may alternatively or predominantly contain from 0.01 to 100 wt. % fibers from coniferous trees, preferably from 0.01 to 50 wt.%, most preferably from 5 to 40 wt.% of the total weight of the paper base. The paper base contains not more than 0,01, 0,05, 0,1, 0,, 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.% small fractions of the total mass of the paper base, including all ranges and sub-ranges of these values.

The paper base may contain fibers of softwood from those trees that have a canadian standard degree of grinding (KCC) from 300 to 700, more preferably from 250 to 650, most preferably from 400 to 550. This range includes 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 and 550, including all ranges and sub-ranges of these values.

The paper base of the present invention may contain from 1 to 99 wt.%, preferably from 5 to 95 wt.% cellulose fibers of hardwood trees from the total amount of cellulose fibers in a paper basis. This range includes 1, 2, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95 and 100 wt.%, including all ranges and sub-ranges of these values from the total amount of cellulose fibers in a paper basis.

The paper base may alternatively or predominantly contain from 0.01 to 100 wt.% fibers from deciduous trees, preferably from 50 to 100 wt.%, most preferably from 60 to 99 wt.% of the total weight of the paper base. The paper base contains 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, 99 and 100 wt.% small fractions of the total who assy paper base, including all ranges and sub-ranges of these values.

The paper base may contain fibers of deciduous trees that have a canadian standard degree of grinding (KCC) from 300 to 700, more preferably from 250 to 650, most preferably from 400 to 550. This range includes 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 and 550, including all ranges and sub-ranges of these values.

If the paper base contains fibers of hardwood and softwood, it is preferable that the ratio of deciduous/coniferous species ranged from 0.001 to 1000. This range may include 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, including all ranges and sub-ranges of these values and all ranges and sub-ranges of these values in the reverse ratio.

Fiber deciduous and coniferous species have an average length of preferably not less than 75 μm, more preferably not less than 80 μm, most preferably not less than 100 μm. The length of these fibers is greater than or equal 75, 77, 80, 82, 85, 87, 90, 92, 95, 97 and 100 microns, including all ranges and subranges these values, and any and all ranges and subranges therein.

In addition, the fibers of hardwood and softwood contained in a paper substrate of the present invention, can be modified by physical or chemical means. Examples of physical means include, without limitation electromagnetic and mechanical means. Tools electrical modification include, without limitation means providing contact of the fibers with the source of electromagnetic energy such as light and/or electric current. Means of mechanical modification include, without limitation means providing a contact of an inanimate object with the fibers. Examples of such inanimate objects include objects with sharp and/or blunt cutting edges. Such means include, for example, cutting, kneading, crushing, piercing, and other means.

Examples of chemical agents include, without limitation, ordinary chemical means of modification of the fibers, including the formation of cross-linking and deposition of their complexes. Examples of such modification can be found without limitation in the following patents: 6,592,717, 6,592,712, 6,582,557, 6,579,415, 6,579,414, 6,506,282, 6,471,824, 6,361,651, 6,146,494, H1,704, 5,731,080, 5,698,688, 5,698,074, 5,667,637, 5,662,773, 5,531,728, 5,443,899, 5,360,420, 5,266,250, 5,209,953, 5,160,789, 5,049,235, 4,986,882, 4,496,427, 4,431,481, 4,174,417, 4,166,894, 4,075,136 and 4,022,965, which are incorporated herein in full by reference.

Sources of "fines" can be found in the fibres of the SaveAll, circulating flows, flows of scrap, waste streams fibers. The amount of "fines"present in this paper may be changed by changing the speed, with which such flows are added to the paper manufacturing process.

The paper base preferably contains a combination of hardwood fibers, softwood fibers and fine fractions". "Fine fraction", as mentioned above, are working, and the average length of the fibers is typically less than 100 μm, preferably not more than 90 μm, more preferably 80 μm and most preferably 75 μm. The length of the fibers of fine fractions preferably not more 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 sub-ranges of these values.

The paper base contains from 0.01 to 100 wt. % minor fractions, preferably from 0.01 to 50 wt.%, most preferably from 0.01 to 15 wt.% by weight of the total base. The paper base contains not more 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.% small fractions of the total mass of the paper, including all ranges and sub-ranges of these values.

The paper base may alternatively or preferably contain from 0.01 to 100 wt.% fine fractions, preferably from 0.01 to 50 wt.%, most preferably from 0.01 to 15 wt.% from the total mass of fibers contained in a paper basis. The paper base contains not more 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.% small fractions of the total mass of fibers contained in the paper base, including all ranges and sub-ranges of these values.

The paper base in one embodiment of the present invention may contain less fiber fine fractions and more long fresh fibers of hardwood and/or softwood, preferably primary. The net effect of the paper base is to produce a sheet of cellulose fibers, which are more mellow, as if in the basis there was a greater number of small factions. The use of larger solid fresh fibers of hardwood and/or softwood, preferably primary, instead of fines may result in a less dense fabric containing high amount of bulk fibers, which can no longer be compressed and to be more homogeneous, which will lead to an increase in smoothness after extrusion and/or calendering. This ideal is demonstrated by Example 1 below, together with figures 1 and 2, which shows a graph of smoothness in Sheffield in units of Sheffield the upper and lower sides respectively of the paper base against ash in the interest of this paper. One paper basis contained vysokoallergennyh fibrous mass SaveAll high surface area, while the other contained a highly plasticised fibrous mass. The paper base containing highly plasticised fibrous mass, will have B. is more smooth surface at equal ash, than the paper base containing vysokoallergennyh, and/or processed, and/or cellulose SaveAll equal in ash content.

The paper base of the present invention may contain a filler.

The fillers can be inorganic. Examples of fillers include, without limitation, clay, talc, calcium carbonate, hemihydrate calcium sulphate and dehydrate calcium sulphate. The preferred filler is calcium carbonate, and the preferred form is precipitated calcium carbonate, even if it is in the form of ground calcium carbonate.

The paper base of the present invention may contain from 0.001 to 50 wt.% filler by weight of the total bases, preferably from 0.01 to 40 wt.%, most preferably from 1 to 30 wt.%, at least one filler. 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, 20, 22, 25, 30, 35, 40, 45 and 50 wt.% from the total mass basis, including all ranges and sub-ranges of these values.

The paper base preferably contains a complex fiber-filler, more preferably a complex fiber-caso3". Complex fibre-filler" is a complex in which the fiber and filler are chemical and/or physical interaction. Ways of making complex fiber-filler may include any known method, including the methods described in French patent 92-04474 and U.S. patent No. 5,731,080; 5,824,364; 5,679,220; 6,592,712 and 5,665,205, which are incorporated herein in full by reference. Further ways of making a complex fiber-filler" is shown in Fig.4-6.

The paper base preferably contains a complex fiber-filler, which is preferably manufactured by the methods described herein. Complex fibre-filler" is a complex in which the fiber and filler are chemical and/or physical interaction. The ratio of filler to the fiber can be any. The ratio of filler/fiber may be from 0.001 to 1000. The ratio of filler/fiber may be 0,001, 0,005, 0,01, 0,02, 0,05, 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, 2,5, 3,0, 4, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 225, 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950 and 1000, including all ranges and sub-ranges of these values.

The average particle size of the filler in the complex fiber-filler" can be anything. Examples of the average size of the filler particles in the complex fiber-filler" values are from 0.01 to 20 μm. The average particle size of the filler may be 0,01, 0,02, 0,05, 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, 2,1, 2,2, 2,3, 2,4, 2,5, 2,6, 2,7, 2,8, 2,9, 3,0, 3,12, 3,2, 3,3, 3,4, 3,5, 3,6, 3,7, 3,8, 3,9, ,0, 4,1, 4,2, 4,3, 4,4, 4,5, 4,6, 4,7, 4,8, 4,9, 5,0, 5,2, 5,5, 5,7, 6,0, 6,2, 6,5, 6,7, 7,0, 7,5, 8,0, 8,5, 9,0, 9,5, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 and 20, including all ranges and sub-ranges of these values.

The average specific surface area of the filler particles in the complex fiber-filler" can be any. Examples of the specific surface of the particles of the filler in the complex fiber-filler" values are from 0.1 to 20 m2/g Specific surface of the particles of the filler in the complex fiber-filler" can be 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, 2,1, 2,2, 2,3, 2,4, 2,5, 2,6, 2,7, 2,8, 2,9, 3,0, 3,12, 3,2, 3,3, 3,4, 3,5, 3,6, 3,7, 3,8, 3,9, 4,0, 4,1, 4,2, 4,3, 4,4, 4,5, 4,6, 4,7, 4,8, 4,9, 5,0, 5,2, 5,5, 5,7, 6,0, 6,2, 6,5, 6,7, 7,0, 7,5, 8,0, 8,5, 9,0, 9,5, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 and 20, including all ranges and sub-ranges of these values.

The amount of filler that is attached to the fiber in complex fiber-filler"can be from 1 to 100 wt.%, preferably at least 9 wt.%, more preferably at least 15 wt.%, most preferably at least 20 wt.% from the total amount of filler added to the reactor. The amount of filler that is attached to the fiber in complex fiber-filler"can be at least 1, 2, 3, 5, 7, 10, 12, 15, 17, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 80, 95 and 99 wt.%, including all ranges and sub-ranges of these values.

The filler in the complex fiber-filler" predpochtitel is about is besieged. In the besieged state of the filler may be of any known form, which can form crystals. Examples of forms can be cubic, scalenohedron, diamond and/or aragonite. The preferred forms are cubic and/or aragonite.

The paper base may contain from 0.1 to 100 wt.% complex fibre-filler by weight of the total basis, including 0,1, 0,2, 0,5, 1, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95 and 100 wt.% and including all ranges and sub-ranges of these values.

Complex fibre-filler" can be made by simultaneous and/or sequential contact of the fibers, CA(Oh)2and/or CO2for the formation of complex fiber-caso3".

Fiber added to create a complex fiber-filler"can have from 3 to 200 m2/g, including 3, 5, 10, 15, 20, 25, 30, 40, 50, 60, 70, 80, 90, 100, 125, 150, 175, 200, 225, 250, 275 and 300 m2/g, including all ranges and sub-ranges of these values.

Complex fibre-filler" can be made by adding solid CA(Oh)2equal to or less than 5%, including a number less than or equal to 0,1, 0,2, 0,3, 0,5, 0,75, 1,0, 1,2, 1,4, 1,6, 1,8, 2,0, 2,5, 3,0, 3,5,4,0, 4,5, and 5.0% of solid CA(Oh)2from the mass of reagents, including all ranges and sub-ranges of these values. However, you may use any percentage of solid CA(Oh)2.

The complex is Alekno-filler" can be made by adding solid CO 2including the number, less than or equal to 0,1, 0,2, 0,3, 0,5, 0,75, 1,0, 1,2, 1,4, 1,6, 1,8, 2,0, 2,5, 3,0, 3,5, 4,0, 4,5 and 5.0% of solid CO2from the mass of reagents, including all ranges and sub-ranges of these values. However, you may use any percentage of solid CO2.

In a preferred embodiment, fibers are introduced into contact with the CO2.

Source of fibers may be any. In addition, the fibers may be pre-mixed with gaseous, liquid and/or solid carrier, such as water, but this is optional.

The source of CA(Oh)2can be any. In addition, CA(Oh)2and/or its source may be in gaseous, liquid and/or solid form. Also CA(Oh)2and/or its source may be pre-mixed with gaseous, liquid and/or solid carrier, such as water, but this is optional.

Preferably, the source of CA(Oh)2may be lime.

The source of CO2can be any. In addition, CO2and/or its source may be in gaseous, liquid and/or solid form. Also CO2and/or its source may be pre-mixed with gaseous, liquid and/or solid carrier, such as water, but this is optional. Preferably CO2is in gaseous and/or liquid form.

CO2can be added to the fibers in which uboe time in the manufacturing process of complex fiber-filler". That is, CO2can be added to the fibers before they enter the reactor, the reaction zone and/or area of contact. CO2can be added to the fibers in the moment when they enter the reactor, the reaction zone and/or area of contact.

In one embodiment of the present invention the complex fiber-filler" is produced by contact of the fibers with CO2prior to contact of the fibers with CA(Oh)2.

In another embodiment of the present invention the complex fiber-filler" is made by mixing in a line of CA(Oh)2in the form of lime with the fibers.

In yet another embodiment, the fibers are introduced into contact with the CO2then mix in line with CA(Oh)2in the form of lime. Fiber and CA(Oh)2in the form of lime to form a slurry with a solids content of less than or equal to 5%, preferably from 1 to 4%, most preferably from 1.5 to 2.5%, the Percentage of solids in the slurry can include values 0,1, 0,2, 0,3, 0,5, 0,75, 1,0, 1,2, 1,4, 1,6, 1,8, 2,0, 2,5, 3,0, 3,5, 4,0, 4,5 and 5.0 wt.%, including all ranges and sub-ranges of these values.

Fibers, Ca(OH)2and/or CO2can be entered in contact with any pH value. Preferably the pH is greater than or equal to 6, more preferably pH can range from 6 to 12, most preferably from 8 to 10.5. the pH can be 1, 2, 3,4, 5, 6, 7, 7,5, 8, 8,5, 8, 9,5, 10, 10,5, 11, 11,5, 12, 12,5, 13 and 14, including all ranges and sub-ranges of these values.

Fibers, CA(Oh)2and/or CO2can be entered in contact in any way.

Preferably, the contact occurs in at least one reactor. Examples of reactors are tubular reactor, tank, tank with continuous stirring, a tubular reactor with continuous action and/or reactor batch. Preferably use a tubular reactor (periodic action) and/or a series of tanks with continuous mixing.

When CO2can be added by adding it at least once in the reactor, preferably CO2is added to the reactor in several places.

When using a tubular reactor with continuous stirring, it is preferable that CO2was added to the reactor in several places. This alternative implementation is shown in Fig.7.

When using a tank with continuous stirring, it is preferable to use a few tanks with continuous mixing, installed in series. This alternative implementation is shown in Fig.

Reaction conditions may be such as to promote adhesion of the fiber and filler in the chemical and/or physical interaction.

A method of manufacturing a complex fiber is-a filler may be added in any known method of making paper. Methods and devices for the production of paper basis and paper materials are well known in the pulp and paper industry. See, for example, the above publication Hesaka (G.A.Smook) and references therein, all of which are incorporated herein by reference. All such known methods of making paper can be used in the practical implementation of the present invention and described in detail will not be. Complex fibre-filler" can be added in the process in a way that fully or partially replaces the conventional fiber. Complex fibre-filler" can be used in the process of making paper in any concentration and/or quantity, desired to obtain the desired degree of retention of complex fiber-filler in paper-based, made with its application.

Complex fibre-filler" can be entered in contact with the paper-based anywhere in the paper manufacturing process. The contact can occur anywhere on the paper manufacturing process, including, without limitation, the cooking solution, the spent cooking solution, the boot section, the section sizing, water tank and the section of the coating. Other places add can be a tank for pulp, section of paper pulp and the suction side is and the purge pump.

The paper base of the present invention may also contain additional substances, including pigments, dyes, optical brighteners, fillers, not included in the complex "fiber-filler"means the retention, sizing agent (e.g., AKD and ASA), binders, thickeners and preservatives. Examples of the binder are without limitation, polyvinyl alcohol, Amres (type kimana), Bayer Parez, emulsion polychloride, modified starch, such as hydroxyethyloxy starch, normal starch, polyacrylamide, modified polyacrylamide, a polyol, the product of the joining of the carbonyl to the polyol, the condensate ethandiol/polyol, polyamide, epichlorohydrin, glyoxal, glyoxal urea, ethandiol, aliphatic polyisocyanate, isocyanate, 1,6-hexamethylenediisocyanate, diisocyanate, polyisocyanate, complex, polyester, resin complex polyester, polyacrylate, polyacrylate resin, acrylate and methacrylate. Other additional substances are not limited to silica, such as colloids and/or sols. Examples of silica include without limitation sodium silicate and/or borosilicate. Another example of additional substances are solvents, including, without limitation, water.

The paper base of the present invention may contain the means of keeping selected from the group consisting of coagulating substances, lakulisa substances and exciting substances, dispersed in the volume of bases and additives to cellulose fibers, increasing porosity.

The paper base of the present invention may contain from 0.001 to 50 wt.% additional substances from the total mass basis, preferably from 0.01 to 10 wt.%, most preferably from 0.1 to 5.0 wt.%, each of the at least one additional substance. 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, 20, 22, 25, 30, 35, 40, 45 and 50 wt.% from the total mass basis, including all ranges and sub-ranges of these values.

Additional substances can be dispersed in the cross-section of the paper base, or can be concentrated in the inner part of the cross-section of the paper base. In addition, other additional substances, such as binders, can concentrate above in the direction of the outer surfaces of the cross-section of the paper base.

The paper base of the present invention may also contain a substance gluing surface, such as starch and/or modified and/or functional equivalents in the amount of from 0.05 wt.% up to 50 wt.%, preferably from 5 to 15 wt. % by weight of the total base. Mass fraction of starch contained in the basis can be 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, 20, 22, 25, 30, 35, 40, 45 and 20 wt.% otoba mass basis, including all ranges and sub-ranges of these values. Examples of modified starches are, for example, oxidized, cationic, leaded, gidroksietilirovanny and other Examples of functional equivalents are without limitation, polyvinyl alcohol, polyvinylene, alginate, carboxymethyl cellulose, etc.

The paper base may be subjected to pressing in a pressing section that contains one or more contact areas. However, it can be used any means of pressing, known in the pulp and paper industry. The contact zone can be, without limitation single-felt, double felt, shafts and extended contact areas in the presses. However, it can be used in any area of contact, known in the pulp and paper industry.

The paper base may be dried in the drying section. Can be used any means of drying known in the pulp and paper industry. The drying section may contain a clothes dryer, the drying cylinder, Condebelt drying device, an infrared drying device or other drying means and mechanisms known in the art. The paper base may be dried to contain any desired quantity of water. Preferably the dried basis, contains water in an amount less than or equal to 10.

The paper base may be passed through the press sizing, where you can apply any funds sizing known in the pulp and paper industry. Press sizing can represent, for example, press for gluing in the mode of irrigation (for example, inclined, vertical, horizontal) or press mode dosing (for example, with scraper, rod). Press sizing substances sizing, such as a binder, can be contacted with a base. Optionally, the same substances sizing can be added at the wet end of the paper manufacturing process. After gluing the paper base may be dried or not dried using the above example of a means of drying and other known in the pulp and paper industry funds. The paper base may be dried to contain any desired quantity of water. Preferably the dried basis, contains water in an amount less than or equal to 10%.

The paper base may calendomatic using any means of calendering, known in the pulp and paper industry. More specifically, it is possible to use, for example, wet calendering, dry calendering, calendering steel rolls, hot soft calendering or calendering of extended contact areas. Without being bound to theory, we Polak who eat the presence of the microspheres, and/or compositions and/or particle of the present invention can reduce the requirements for rigid means of calendering and atmospheres for certain paper bases depending on their intended application.

The paper base may be subjected microfinishing processing any microfinishing means known in the art. Microfilaria processing is a means of finishing the surface of the paper base. The paper base may be subjected microfinishing processing using means of calendering, attached sequentially and/or simultaneously, or without them. Examples funds microfinishing processing can be found in published patent application U.S. 20040123966 and cited in the references, which are all incorporated herein in full by reference.

The present invention is explained in more detail using the following embodiments, which are not intended to limit in any way the scope of the present invention.

EXAMPLES

Example 1

Two sets of the paper base manual low tide were made with different mass fractions of ash. Set 1 contained a small fraction of fibers SaveAll with a large specific surface, whereas Set 2 contained the highly plasticised fiber. Figure 1 and 2 shows graphy and smoothness in Sheffield in units of Sheffield (SU) of the upper and lower sides respectively of the paper fundamentals against the mass fraction of ash, contained in a paper basis. The surface of the paper base containing highly plasticised fiber, smoother at the same ash content than the paper base containing vysokooborotnye, and/or processed, and/or SaveAll fiber with the same ash content.

Example 2

Sample fine fractions SaveAll was selected from the stream at a paper mill and contained a glow that gave 46 points white by CIE. After this sample was mixed with CA(Oh)2and then reacted with CO2forming caso3for the formation of complex fiber-caso3"the sample had 23 points white by CIE; thus reducing the brightness CIE was 23 points. This decrease in residual value OVA refers to the account of the clearing residual OVA in the fibrous mass SaveAll by increasing the pH to >12 adding CA(Oh)2. Table 3 shows data on fluorescence, measured according to the method of CIE-Whiteness, small fractions of fiber SaveAll with the same fiber after the formation of the complex fiber-caso3". Adding Ca(OH)2the fibers have led to an increase in pH to values greater than 12 and, as shown by the data in figure 3, caused a decrease in the efficiency of residual OVA.

Example 3

Research results JEP, which had the objective characteristics of complex fiber-filler"required to perform the surveillance task JDA (see 2), will be summarized in this section.

JEP-3: the Purpose of this study was to identify the best size and shape (i.e., morphology) of precipitated calcium carbonate (COC)attached in the complex fiber-filler" in order to maximize the volume and strength of the fabric. To obtain these samples were used way SMI 4G with the aim of obtaining complexes "fiber-filler" component precipitated calcium carbonate, the corresponding new products "3G" SMI (e.g., Megafil-4000, UltraBulk-II, Albacar-SP and others). Figure 4 summarizes the properties of samples for physical testing are compared with the control sample Saillat Megafil-2000 (i.e., Megafil-S). You can see that the composite UltraBulk-II has better volume and stiffness, while reducing the required size of AKD and OVA relatively Megafil-S. unfortunately, because of the nature of the way "4G", which contains the preliminary carbonization COC to >90% conversion before adding fiber, these samples were observed very low values of coupling the OCC with the fiber (see table 6). As shown in table 6, the adhesion of the composite UltraBulk-II was less than half of the samples from the tubular reactor Carthago. The study JEP-4 began to look for ways to improve the adhesion of the JCC with fiber, but most of the successes in this area have been made in research JEP 7-8, conducted in parallel with JEP-7 in lab the SMRC, and research JEP-8 were conducted in the pilot plant in Portland.

JEP-7: the Aim of the study JEP-7 was the study of process variables that affect the adhesion of the OCC fibers, while not touching the morphology. Sample JEP-7 were obtained using a tube of a team of researchers at the pilot SMI in Portland, and the results are summarized in table 7 and Figure 5. As shown in table 7 and Figure 5, in the course of this research were obtained from various products of cubic shape. These large cubic structure JCC had the best dimension and characteristic OVA than the used sample Megafil-S, but they gave little less opacity. The research team believes that this optical disadvantage can be overcome by using a target of increasing the number of filler. In this study, the process has been two changes to improve the clutch and try to shift the morphology of large cubes. These changes are:

(1) pretreatment of the fiber gaseous CO2before adding lime. This change seems to affect improvement clutch OCC fibers;

(2) the mixing of lime and fibers in the line, and not mixing them prior to carbonization. This change seems modifies the morphology of the JCC towards greater tendency to images is the cube.

Table 6
Products JEP-3, indicating the particle size (APS), specific surface area (SSA) and the percentage of clutch
COMPOSITE (3 reactors)APSSSAThe percentage of coupling
MEGAFIL®40003.5 µm2.7 m2/g9%
MEGAFIL®XL6,41,69
ULTRABULK®II4,04,319
ALBACAR®SP4,33,07
Poludiskretnykh aragonite2,87,717
The tubular reactor (1)1,17,641
OKK MEGAFIL®2000 (standard filler Saillat, HE composite)2,3 µm5.1 m2/g 8%

Table 7
Product overview JEP-7, indicating the percentage of adhesion, morphology characteristics and conditions of carbonization. Even in the absence of targeting specific morphology process conditions often give large cubic crystals COC. In addition, these large cubes inched to the fiber. Also in this study it was observed that pre-treatment gas (i.e., pre-carbonization) fiber has led to an increase in the formation of large cubic crystals COC.
The sample numberProduct sizeAdhesion (%)ReactorThe condition of the fiberThe scale of the response
4799-61 .4Cuba 2-5 µm)43%With continuous stirring and tubeNOT carbonitrilesThe experimental set-up
4799-63 .1Cuba 1-2,5 µm54With continuous mixingPrior the preliminary carbonization The experimental set-up
4799-79 .2Cuba 1-2,5 µm61TubePreliminary carbonizationThe experimental set-up
4799-80 .1Cubes of 0.5-3 microns66With continuous mixingPreliminary carbonizationThe experimental set-up
4799-81 .1Cubes of 1.5-2.5 μm28?With continuous mixingNot carbonitrilesThe experimental set-up
4847-143Cuba 1-2 microns54With continuous stirring and tubePreliminary carbonizationLaboratory

JEP-8: Purpose of the study JEP-8, which was carried out in parallel JEP-7, was to improve the adhesion morphology UltraBulk-II, defined in the study JEP-3. This work was conducted the ü in SMRC using laboratory reactor system with continuous mixing. During this study were performed more than 50 experiments to verify the number of parameters in an attempt to achieve good adhesion COC with fiber, preserving at the same time, the morphology of UltraBulk-II, defined in the study JEP-3. Some of the estimated parameters include the degree of pre-conversion COC before adding fibers, chemical additives, temperature, pressure, reactor type, source of fiber, pre-treatment of the fiber gas, the use of different types of crystals, etc. In the end, the following conclusions were made.

(1) the Fiber must be present from the beginning of the reaction in order to achieve good adhesion COC with fiber. If the lime pre-carbonized before adding fibers or leads to poor morphology, if the degree of pre-conversion is too low (e.g., <50%), or leads to a bad clutch, if the degree of pre-conversion is too large.

(2) If the fiber is present from the beginning of carbonization, to control the morphology becomes very difficult. In fact, the researchers were unable to obtain a structure similar to the OCC UltraBulk-II, when the fiber was present from the beginning of the carbonation. As in the study JEP-7, many samples JEP-8 gave a cubic structure COC, so it was decided that the researchers dollars the us to evaluate the cubic structure of complexes "fiber-filler" (JEP-9).

In table 8 and figure 6 summarizes the products and product specifications JEP-7. Characteristics of the cubic samples handmade character JEP-7 were similar to the cubic samples JEP-7 that they were better requirements AKD and OVA, had a worse optical properties and were a bit higher in volume (1-3%).

Table 8
Products JEP-7 indicating the adhesion and morphology of complex fiber-filler" and some conditions of the production process
The SAMPLE NUMBERPRODUCT SIZEThe CLUTCH %REACTORThe condition of the FIBER
4847-23Amorphous + Cuba59,7With continuous mixingNOT carbonitriles
4847-59Cubes of 0.5-1 µm46,7Tubular and 2 with continuous stirringPre-carbonized
4847-27 .2*Aragonite is 1.5-2 μm43,3 With continuous mixing 97% advance conversionNOT carbonitriles
4847-94Scalenohedron 2 microns30,0TubeNOT carbonitriles
4847-167 .4VAragonite 4 microns53,62 with continuous stirring, 97% pre-conversionNOT carbonitriles

JEP-9: the Purpose of the study JEP-9 was the confirmation of the characteristics of the cubic composite structures "fiber-filler in the sheet manual low tide. The results JEP-9 were represented in the Executive committees of the IP-SMI and paper mill Saillat in March 2004 7 shows a cubic structure of the research JEP-9. The test results sheet manual low tide DSF in the study JEP-9 are summarized in Fig-14.

Based on the foregoing, in the present invention various modifications and changes. It is therefore understood that within the scope of the attached claims, the invention may be implemented otherwise than specifically described in this document.

Used herein, the term "range what zones" is used to indicate any and every value in this range, including all of its sub-bands.

All links and their cited references cited herein are incorporated herein by reference in relevant parts relating to the subject matter of the present invention and all its embodiments.

1. The paper base containing a set of fibers of hardwood, softwood, or mixtures thereof, which have an average length greater than or equal to 75 microns, and have a filler attached to the said set; less than 50 wt.% fibers having an average length of less than 75 microns, by weight of the total base.

2. The paper base according to claim 1, in which the said multiple fibers of hardwood, softwood is the primary fibers.

3. The paper base according to claim 1, in which the said multiple fibers of hardwood, softwood has a canadian standard grinding degree from 300 to 600.

4. The paper base according to claim 1, in which the fibers, the average length of less than 75 microns, are recycled fibers, recycled fibers, fiber waste, or mixtures thereof.

5. The paper base according to claim 1, in which the filler is attached to the fiber mass ratio of from 0.3 to 8.

6. The paper base according to claim 1, in which the filler is present in an amount of from 1 to 30 wt.% by weight of the total base.

7. The paper is based is as according to claim 1, containing from 0.1 to 20 wt.% fiber lengths of less than 75 microns by weight of the total base.

8. The paper base according to claim 1, in which the filler is precipitated calcium carbonate.

9. The paper base according to claim 1, in which the filler is deposited in at least one form selected from the group consisting of cubic, scalenohedral, diamond and aragonite forms.

10. The paper base according to claim 9, in which the filler has an average particle size of from 0.01 to 20 μm.

11. The paper base according to claim 9, in which the filler has an average particle size of from 0.01 to 10 microns.

12. The method of making the paper base according to claim 1, containing the contact mentioned many hardwood fibers, softwood or mixtures thereof, having an average length of 75 μm and having a filler attached to part of the mentioned sets of fibers, with the fibers, the average length of less than 75 microns, by weight of the total base.

13. The method according to item 12, in addition, contains the contact mentioned many hardwood fibers, softwood or mixtures thereof, having an average length greater than or equal to 75 microns, with CA(Oh)2and/or CO2simultaneously and/or sequentially.

14. The method according to item 13, in addition, contains the contact mentioned many hardwood fibers, softwood or mixtures thereof, having an average length greater than or equal to 75 microns, with CA(Oh)2in line to access the Finance pulp, containing less than 5% solids.

15. The method according to item 13, in addition, contains the contact mentioned many hardwood fibers, softwood or mixtures thereof, having an average length greater than or equal to 75 microns, with gaseous CO2before contact with the said multiple fibers with CA(Oh)2.

16. The method according to item 12, in addition, contains the contact mentioned many hardwood fibers, softwood or mixtures thereof, having an average length greater than or equal to 75 microns, with CA(Oh)2and/or CO2simultaneously and/or sequentially with pH from 7.5 to 11.

17. The method according to item 12, in addition, contains the contact mentioned many hardwood fibers, softwood or mixtures thereof, having an average length greater than or equal to 75 microns, with CA(Oh)2and/or CO2simultaneously and/or sequentially in a tubular reactor, and CO2add in the reactor at multiple points in the input.

18. The method according to item 12, in addition, contains the contact mentioned many hardwood fibers, softwood or mixtures thereof, having an average length greater than or equal to 75 microns, with CA(Oh)2and/or CO2simultaneously and/or sequentially in the sequence of reactors with continuous stirring, and CO2add in each reactor with continuous stirring consistently.

19. The method according to item 12, in addition, containing the second contact mentioned many hardwood fibers, softwood or mixtures thereof, having an average length greater than or equal to 75 μm, and fibers having an average length of less than 75 microns, with CA(Oh)2and/or CO2simultaneously and/or sequentially in the sequence of reactors with continuous stirring, and CO2add in each reactor with continuous stirring consistently.



 

Same patents:

FIELD: textiles; paper.

SUBSTANCE: betulin is meant for being used as filler for paper or cardboard manufacturing. Betulin water suspension is obtained, and then it is added to cellulose pulp during paper or cardboard manufacturing. Water is removed from paper web. Paper or cardboard manufacturing is continued using a conventional method.

EFFECT: improving retention ability of filler, formation light, strength and lightness of paper, providing high volume and low porosity for increasing water impermeability, and preventing brightness reversion of cellulose pulp.

12 cl, 2 tbl, 3 ex, 4 dwg

FIELD: textiles; paper.

SUBSTANCE: method (versions) concerns manufacture of paper and can be used in the paper and pulp industry. Method includes (i) providing a water suspension, which contains cellulose fibres; (ii) adding to the suspension after all the stages of strong shearing action of the first polymer, which is a cationic polymer; a second polymer and a third polymer, which is an organic or inorganic anionic polymer; and (iii) dehydration of the obtained suspension for forming paper.

EFFECT: improvement in the drainage and retention for all types of paper stock, increasing the speed of the papermaking machine, using low doses of polymers, improving the method of paper manufacturing and increasing the economic efficiency of the process.

16 cl, 7 tbl, 7 ex

Paper filler // 2345189

FIELD: textile, paper.

SUBSTANCE: filler is designed for paper making and can be used in pulp-and-paper industry. Filler contains calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where filler is essentially free from either cellulose fibre or fibrils or lignocellulose. Filler contains calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where cellulose derivative can contain cationic groups. Besides the invention refers to production process of filler involving mixing the agent substance containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, essentially without cellulose fibre or fibrils or lignocellulose. Other production process of filler consists in mixing the agent substance containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where cellulose derivative contains cationic groups. The invention refers to method for making paper including preparation of aqueous suspension containing cellulose fibre, suspension addition with filler containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where filler is essentially free from either cellulose fibre or fibrils or lignocellulose; dehydration of suspension thus making web or paper sheet. The invention also refers to method for making paper including preparation of aqueous suspension containing cellulose fibre; suspension addition with filler containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where cellulose derivative contains cationic groups; dehydration of suspension thus making web or paper sheet.

EFFECT: higher sizing efficiency with good drainage, retention and serviceability of papermaking machine.

24 cl, 3 tbl, 4 ex

FIELD: textiles, paper.

SUBSTANCE: method refers to pulp-and-paper industry, specifically to method for making bag paper, as well as to bag paper with improved service properties. Method for making bag paper involves pulp beating stage at fibre concentration 28-40% and thereafter at fibre concentration 3-6%. It is followed by two-staged addition of reinforcing and at once flocculating agent to pulp. Then paper web is casted and dried. Further beating stage at fibre concentration 3-6% requires power consumption within 20-60 kWt/h per paper ton. The second stage of addition is followed with the third stage of addition implying flocculating agent preceding headbox. Herewith at the first stage, reinforcing and at once flocculating agent is cationic starch of fractional substitutionality 0.040-0.150 in amount 0.1-1.2% of absolutely dry fibre weight, or polyacrylamide in amount 0.1-0.5% of absolutely dry fibre weight. Specified agent is added to pulp, 5-120 minutes prior to paper web casting. At the second stage reinforcing and at once flocculating agent is added in amount 0.005-0.400% of absolutely dry fibre weight. Specified agent is added to pulp, 20-120 seconds prior to paper web casting. At the third stage flocculating agent is anionic montmorillonite microparticle dispersion. Specified agent is added to pulp in amount 0.05-0.50 % of absolutely dry fibre weight. Bag paper is made under the offered method.

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4 cl, 1 tbl, 3 ex

FIELD: chemistry.

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EFFECT: obtaining water-soluble polymer dispersion with low viscosity and high molecular weight, increase of serviceable life in storage.

23 cl, 3 tbl, 25 ex

FIELD: paper making.

SUBSTANCE: composition for manufacture of paper has flocculating cationic polymeric retention means, phenol resin, and polyethylene oxide. Cationic polymeric retention means is liquid aqueous cationic polymer dispersion free of solvent and oil phase and having viscosity of from 2,000 to 20,000 mPa˙s at concentration of 1%. Cationic polymeric retention means may be added into composition in conjunction with phenol resin or separately from it at other point. It may be also used for preliminary treatment of filler which is to be further added to composition.

EFFECT: increased extent of retention and dehydration of composition for manufacture of paper, high quality of paper sheets and reduced manufacture costs.

11 cl, 4 dwg, 5 tbl, 3 ex

FIELD: pulp-and-paper industry, in particular, additive for pulp.

SUBSTANCE: product contains first polysaccharide having at least one first cationic substituent comprising aromatic group, and second polysaccharide having at least one second cationic substituent free of aromatic group. Method for producing of paper from water suspension containing cellulose fibers and, optionally, fillers involves adding cationized polysaccharide product to water suspension; forming and dehydrating water suspension on fabric, said cationized polysaccharide product being produced by providing reaction between first polysaccharide with at least one first aromatic agent, and second polysaccharide with at least one second agent free of aromatic group; mixing resultant polysaccharides.

EFFECT: improved dehydration and retention capacity through utilization of cationized polysaccharide product.

25 cl, 11 tbl, 10 ex

FIELD: paper-and-pulp industry.

SUBSTANCE: cellulose product contains clay having stacking of atomic planes 2R2. Product represents paper of fibrous pulp, while clay has cationic nature. Preparation of product comprises: providing aqueous suspension containing cellulose fibers and optionally filler; adding clay having stacking of atomic planes 2R2.to suspension; and dehydrating thus prepared suspension. Another method of preparing cellulose product comprises: providing aqueous suspension containing cellulose fibers and optionally filler; adding cationic clay to suspension; adding one or several draining auxiliary substances enhancing retention of filler and containing at least one cationic polymer; and dehydrating thus prepared suspension.

EFFECT: reduced interfering and harmful substance in cellulose suspension and enhanced retention of filler, dehydrating agents, and sizing agents.

27 cl, 14 tbl, 13 ex

FIELD: pulp-and-paper industry, in particular, manufacture of paper and cardboard.

SUBSTANCE: method involves preparing aqueous cellulose pulp; adding holding system into cellulose pulp system; draining pulp through cloth for forming of paper web; drying resultant paper web. Holding system comprises swelling clay having whiteness of at least 70.

EFFECT: increased whiteness of paper and improved filler retention capability.

16 cl, 1 tbl, 20 ex

FIELD: pulp-and-paper industry, in particular paper or board production.

SUBSTANCE: claimed method includes providing of slurry containing cellulose fiber and at least sizing agent interacting with cellulose. Sizing agent is selected from group containing ketene dimmers and acid anhydrides. Cationic vinyl polymer obtained by additional polymerization, containing aromatic units and anionic vinyl polymer obtained by additional polymerization and having molecular mass from 6000-100000 are introduced into slurry. Then obtained slurry is dehydrated and paper leaf is formed.

EFFECT: increased effectiveness of sizing, dehydration and retention.

11 cl, 3 tbl, 2 ex

FIELD: textile fabrics, paper.

SUBSTANCE: method is intended for preliminary treatment of fibrous material in production of paper, cardboard and similar produce. Fibrous material is preliminarily treated in mixer of transmission type, which works according to principle of impact mill. Then fibrous material is supplied in the form of crushed liquid fractions or solid substance into precipitating reactor. Gas is also supplied there to create gas space. Gas comprises substance, which assists in precipitation of mineral substance, for instance, carbon dioxide (CO2). Device comprises precipitating reactor and additional activating device that provides for more intense capability of fibers to connect to each other and to precipitated mineral substance. Device may be easily inbuilt into production process of paper manufacture.

EFFECT: highly efficient precipitation of mineral particles on fiber with provision of specified paper properties.

26 cl, 7 dwg

FIELD: soft wares, paper.

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EFFECT: compound refinement for hydrophobisation of pulp materials, supplying of its hydrophobization efficiency and storage life duration.

5 cl, 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

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. Calcium hydroxide suspension is treated with aluminum sulfate solution in the aqueous medium at stirring. The treatment is conducted in the aqueous medium containing the binding in the dissolved state. The binding is chosen from the group, which includes starch and polyvinyl alcohol in the amount of 0.5-5.0 mass % from the mass of the absolutely dry pigment, and-or the colorant in the amount of 0.1-0.5 mass % from the mass of the absolutely dry pigment. The technical result of the invention is the improved quality of the pigment and expansion of its field of application.

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

2 tbl

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

SUBSTANCE: the invention is pertaining to the method of production of the composite 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 hydroxide is mixed with kaolin and added with aluminum sulfate in the aqueous medium at stirring. The aqueous medium contains the binding chosen from the group, which includes starch and polyvinyl alcohol in amount of 1.5-5.0 % from the mass of the absolutely dry pigment, and-or the water soluble colorant in amount of 0.1-0.5 % from the mass of the absolutely dry pigment. The technical result of the invention is the improvement of the composite pigment quality and expansion of its field of application.

EFFECT: the invention ensures improvement of the composite pigment quality and expansion of the field of its 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

The invention relates to a method of filling calcium carbonate cellulose fibers, filled with paper and method of making filled paper of cellulose fibers

FIELD: chemistry.

SUBSTANCE: invention can be used for production of deposited calcium carbonate used as paper filler. Secondary particle diameter of deposited calcium carbonate is 1-10 mcm. Deposited calcium carbonate consists of aggregated primary particles of spindle calcium carbonate with greater particle diameter within 0.5 to 3.0 mcm, smaller diameter within 0.1 to 1.0 mcm with ration of specified diameters equal to 3 or more. Specific surface area BET of primary particles of calcium carbonate is 8-20 m2/g, cell volume is 1.5-3.5 cm3/g. Method of production of deposited calcium carbonate includes as follows. Carbon dioxide or carbon dioxide gas is injected in calcium hydroxide suspension concentrated 100-400 g/l, prepared by wet calcined liming activity of which 4 "н." HCl at third minute value is reduced to 150-400 ml. Reaction is resulted in carbonisation degree within 50 to 85%. Then 1 to 20 vol % of calcium hydroxide suspension is added. Reaction is complete with injection of carbon dioxide or carbon dioxide gas. The paper containing the specified calcium carbonate as filler is offered as well.

EFFECT: enhanced paper bulkiness.

7 cl, 2 tbl, 10 ex

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. The suspension may be additionally dried and to produce the powder. The technical result of the invention is improvement of the pigment quality and expansion of the field of its application.

EFFECT: the invention ensures improvement of the pigment quality and expansion of the field of its application.

2 cl, 2 tbl

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