Method of paper or cardboard production and paper or cardboard produced by method

FIELD: textile, paper.

SUBSTANCE: method relates to paper or cardboard production and can be used on pulp-and-paper industry. Part of paper pulp fiber is treated with a polymer at least within two stages. Paper pulp treated with the polymer is mixed with remaining non-treated paper pulp. The mixed paper pulp is dehydrated on a net conveyor for forming fibrous web.

EFFECT: increase of strength without negative effect upon paper or cardboard volume with decreasing quantity of adding polymers and enhancing economical efficiency of the process.

14 cl, 4 dwg, 2 ex

 

The present invention relates to a method for manufacturing paper or cardboard products, which used a paper weight handle partially-Paladino polymers.

Prerequisites to the creation of inventions

In the paper industry there is a need for durable paper and cardboard products with high volume (low density). For the manufacture of paper and cardboard products, with high volume, less amount of fiber, which is especially desirable for economic reasons. Bulk cardboard products with low fiber content has a greater stiffness in bending. Paper and cardboard products are usually produced by dehydration of the composition on a grid conveyor. The composition often contains a mixture of different pulp mass, including both pulp and mechanical wood pulp. For making larger paintings with greater structural rigidity began to use more mechanical wood pulp high degree of grinding. For best results mechanical wood pulp must contain long undamaged fiber and less small particles of fiber. However, the pulp containing a large number of coarse long fibers, unfortunately, have low when osobnosti to the formation of a sufficient bonding of the fibers in paper or cardboard. The dimensions and mechanical properties of the resulting paper or paperboard, thus, are a compromise between the ability of the pulp to increase volume and its ability to enhance skleivaemosti fibers of paper or cardboard.

Sleevenote fibers mechanical wood pulp can also be enhanced through its processing of chemical additives. The prevailing processing to enhance strength, especially the strength in the dry state, of paper or paperboard hitherto consisted in the addition of cationic starch in the slurry of cellulosic fibrous mass to the operation of the sheet formation. However, it is difficult to ensure the adsorption of large quantities of starch and fiber, especially when a small quantity of small particles of fiber. Molecules of cationic starch added to a suspension of pulp may stick to the fibres of natural anionic pulp under the influence of electrostatic attraction and thus maintained in a wet fibrous web and to remain in the finished paper or paperboard.

However, there are two main drawbacks when using nationaldirectory starch as an additive in the suspension of pulp for making paper. The first drawback lies in the fact that the molecules of the cationic starch can hearth shall be anionic charge on cellulosic fibers, thus setting a limit to the number of cationic starch, which can be added to the suspension. If you add an excessive amount of cationic starch, only a part of added starch will be held in the canvas, and the rest will circulate in the circulating water system of the paper or Board machine. The second disadvantage is that the fibers become positively charged under the influence of added excess amount of cationic starch, cannot adsorb other cationic additives, which are usually injected into a suspension of pulp, for example, adhesive agents.

Another way to improve the strength properties of the paper lies in the treatment of fibers with polymers. This method is described in international patent WO 0032702 A1, according to which particles, such as fibers, provide a multilayer coating of interacting polymers. Particles treated in the course of sequentially executing the stages of the solutions of the interacting polymers. Before each subsequent stage of processing of unabsorbed excess polymer previous stage must be removed if not exercised by careful regulation of the amount added in each stage of the polymer, so that essentially all of the polymer was absorbed on the surface of the particles is in order not to leave too much.

By treating the pulp according to the method described in international patent WO 0032702 A1, paper introduce more polymers and ensure their retention in it. Paper made from the treated pulp, has increased strength. However, it is established that polymer processing according to this method has a negative impact on the volume of paper, i.e. paper weight becomes undesirable high. Polymer processing is the process by which consume substantial amounts of polymer. Thus, there is a need for a method of manufacturing paper or cardboard, through which you can increase strength without negative effects on the volume.

Brief description of the invention

The aim of the invention is to provide a method for manufacturing paper or cardboard, which would have increased strength without detrimental effects on their volume.

To reach this aim by using the method according to claim 1 of the claims. It was also established that if the subject polymer processing only part of the paper pulp, the strength of the resulting paper or paperboard products is significantly increased, while the volume remains essentially unaffected. Above, the purpose of such education is, reach through the use of the present invention, as defined in additional independent claims. The preferred options are presented in the dependent claims and the subsequent description.

The present invention created a method of manufacturing paper or cardboard products, including: providing paper pulp containing fibers; polymer processing the first part (1) paper pulp, which pulp type polymers, in at least two stages; mixing the aforementioned polymer subjected to the processing of the first part (1) paper pulp raw second part (2) paper and pulp dewatering of paper pulp on a grid conveyor for forming a fibrous web. By processing only part of the paper pulp strength of the resulting paper or paperboard products significantly increase, leaving the volume essentially unaffected.

Mentioned the first part of the paper pulp preferably contains 20-80 wt.% of the total weight of the composition. In one embodiment, referred to the first part of the paper pulp containing the long fibers present in the composition. Polymer processing is preferably performed using the first part of the paper pulp, which contains sulfate is or sulfite pulp mass of the fiber is soft (pine) wood. Paper pulp can contain fillers and other additives used in the manufacture of paper, with the fillers and additives can be added after the polymer processing mentioned the first part of the paper pulp. In an alternative embodiment, the fillers and additives can instead be added to the polymer processing mentioned the first part of the paper pulp.

The polymer used in each of the successive stages of polymer processing, preferably interacts with the polymer used in the subsequent stage. Polymer processing preferably includes one stage, which is added to the cationic polymer, and at least one phase, which is added to the anionic polymer. According to one theory by alternating cationic and anionic polymer additives get interacting polymer layers. The cationic polymer is preferably cationic starch and anionic polymer is preferably carboxymethylcellulose (CMC). Polymer processing can be performed in two to seven stages. Polymer processing is preferably carried out in three to seven consecutive stages.

The invention also relates to a paper or cardboard product, manufactured according to the method in accordance with the present invention.

Brief description of drawings

Figure 1 presents a schematic view of one of the variants of the method according to the present invention;

figure 2 - comparison chart of density and strength of the paper produced according to the present invention and manufactured according to the method prototype.

Detailed description of the invention

The invention relates to a method of making paper or paperboard of paper pulp, part of which is treated with a polymer, in at least two stages. The invention also relates to a paper or cardboard product, manufactured according to the method in accordance with the present invention.

When processing paper pulp according to the method prototype, described in document WO 0032702, during which the whole composition is treated with cationic and anionic polymers performed sequentially in stages, the number of polymers in paper or cardboard products may be increased. Thus, for example, in manufacturing paper or cardboard with a high content of cationic starch and, therefore, to get a very strong paper or cardboard products.

It is now established that by processing the polymers only part of the pulp during two or more stages of polymer processing, the amount of polymer added to the composition, decreases in the calculation of the and the whole mass of cellulose composition, and strength properties of paper or paperboard unexpectedly remain very good, despite the reduction in the amount of added polymer. Even more unexpectedly, the volume of paper or cardboard products only increases slightly in comparison with a paper or cardboard products, which were not added to the polymers. The smallest increase in density, it is important to obtain cardboard with high rigidity in bending at a certain strength.

The present method of manufacturing paper or cardboard product includes: providing paper pulp containing fibers; polymer processing the first part (1) paper pulp, in which the composition is added to the polymer in at least two stages; mixing the aforementioned polymer subjected to the processing of the first part (1) paper pulp raw second part (2) paper and pulp dewatering of paper pulp on a grid conveyor for forming a fibrous web. By processing only part of the pulp strength of the resulting paper or paperboard products thus unexpectedly significantly increased, while the volume remains essentially unaffected. Mentioned the first part of the paper pulp contains 20-80 wt.% of the total weight of the composition, preferably 20-50 wt.% of the total who assy composition. Share the first part of the regulate to achieve the desired strength and density of the products, while providing for the possibility of a small amount of added polymer. If the first part is too small, then increasing the strength of the products is not sufficient, as part of paper pulp, processed polymers, mixed with mostly raw paper pulp. On the other hand, if the first part is too large, then the required increase of the added amount of polymer is <on> greater than can be achieved increasing the strength of the product, this also increases the density of the product (i.e. decreases its volume). The corresponding proportion of the first part also depends on the properties of the composition of the first part, as well as from the properties of the second part. Paper pulp usually contains a mixture of various types of pulp, such as wood pulp (pulp solid (hardwood) wood, soft (pine) wood, sulphate or sulphite pulp or mechanical pulp (chemical thermo mechanical pulp (TMDM) or thermomechanical pulp (TMDM)). In one embodiment, the mentioned first part composition containing the long fibers present in the composition. These fibers attach great coloring strength is ü finished products, the more short fibers, and polymer processing, therefore, is especially effective when doing it using part of the composition containing the long fibers. Polymer processing is preferably performed by using the first part of the composition containing sulphate or sulphite pulp, as these pulp contain long fibers in comparison with other pulp mass. Processing part of the composition containing sulphate or sulphite pulp is thus normal by selecting the part containing long fibres, ready-mixed composition. However, the above-mentioned first part of the song, which is subjected to polymer processing, can contain any part of the song. The composition may also contain fillers and other additives used in the manufacture of paper; fillers and additives can be added after the polymer processing mentioned the first part of the composition. In an alternative embodiment, the fillers and additives can instead be added to the polymer processing mentioned the first part of the composition. A certain amount of paper and cardboard contains fillers or other additives, by means of which improve the surface properties of paper. However, particles of the filler are also harmful in the iyayut strength of paper. One theory is that when processing polymer compositions containing fillers and additives according to the invention, the particles of filler and additives stronger stick to other particles or fibers and, therefore, a high content of filler to some extent, does not have a detrimental effect on the strength of paper.

The polymer used in each of the successive stages of polymer processing, is preferably interacts with the polymer used in the subsequent stage; thus allowing the possibility to attach to the fibers more polymers and thus in the increase of the strength of the finished paper or paperboard products. Polymer processing preferably includes one stage, during which adds anionic polymer, and at least one stage, during which the type of cationic polymer. By alternating anionic and cationic polymeric coatings can be obtained interacting polymer layers.

The anionic polymer may be one or more selected from the group consisting of: carboxymethylcellulose (CMC), polyvinyl sulphate, anionic galactoglucomannan, anionic starch, polyphosphoric acid, alginate and poly (methacrylic acid). Anionic polymer is prefer is Ino CMC, as she interacts well with cationic polymers, and its use is economically advantageous because of its low cost. The cationic polymer may be one or more selected from the group consisting of: cationic starch, polyvinylene, chitosan, primary and secondary amines, polyethyleneimine, polyvinylpyrrolidone and modified polyacrylamides. The cationic polymer is preferably cationic starch, which is preferred, as a result of its use are cardboard or paper having improved strength properties, and because it is economically advantageous due to its low cost and easy availability.

Polymer processing is preferably performed in two to seven consecutive stages. The optimal number of stages depends on the required properties of paper or cardboard, and from the properties of the composition subjected to processing. The larger the number of stages includes processing, the greater the amount of polymer type and, thus, more of them kept in paper or cardboard. Often there is a balance between cost and desired properties, such as strength of paper or cardboard. Usually there is a limit beyond which it is inadvisable from the point of view of economic efficiency, add polymers to further improve desire what's properties, for example, increasing the strength of the produced paper or cardboard. Preferably the addition of the cationic polymer in the first stage polymer processing and adding anionic polymer during subsequent processing, as well as the continuation of the alternate adding the cationic and anionic polymers to achieve the desired amount of polymer added in the course of performing the desired number of stages.

The composition need not be washed between stages of polymer processing. Any unabsorbed excess amount of polymer added in the previous stage, may remain in the composition and does not need to be washed. Tests have shown that washing between stages of polymer processing does not result in improved properties of the resulting products. Thus, it is preferable to expose the first part of the song each stage polymer processing without any intermediate rinsing. Thus, an optional stage can be excluded, due to what can be expedited processing, requires less water.

After each stage polymer processing should be enough time for mixing of the polymer, which must be absorbed by the fibers of the first part of the composition. Suitable period of time between each stages of polymer processing and is at least 5 seconds. The optimal period of time depends on the performance of the hardware mixing.

The polymer in each stage polymer processing can be added to the composition that is in the tank for pulp, for example in pulp pool, or in production lines in the pipeline for the transportation of pulp, or combination. The place that's supposed to add the polymer depends on the available equipment and the feasibility of the introduction. If two or more stages of polymer processing by introducing the polymer into a production line must be provided for a condition where either the pipe must be of sufficient length in order to thoroughly mix the polymer and the pulp mass and enough time between stages of introduction of the polymer, which is supposed to absorb or production line, you can use the mixer to ensure good mixing in the pipeline.

The amount of polymer to be added can vary depending on the properties of the pulp. When using cationic starch and CMC for polymer processing, the amount of cationic starch added in each stage, is typically in the range 5-25 kg/t, and the number of CMC added in each stage, usually costs the t in the range of 0.25-3 kg/T. The amount of polymer added to the composition can be monitored by measuring the z-potential or measurement nationaliste pulp. Even if the excessive amount of an added polymer is not harmful to the finished product, then, of course, it is preferable to add such an amount of polymer, which is close to the amount that can be absorbed by the pulp mass, both for economic reasons and for reasons connected with the protection of the environment.

Figure 1 schematically illustrates the method according to one embodiment of the invention. This embodiment of the composition for the manufacture of paper or paperboard served in the tank 1, 2 for pulp, respectively. The composition is submitted and contained in the first container 1 for pulp, designated as the first part of the composition, and the composition is submitted and contained in the second vessel 2 for pulp, designated as the second part of the composition.

The first part of the composition is subjected to polymer processing in three stages. The second part of the composition is not subjected to any polymer processing. In the first stage 4 polymer processing cationic polymer such as cationic starch, add in the first part of the composition in the production line in a pipeline for transporting the composition, which is you the e flow from the tank 1 to pulp. In the second stage 5 of anionic polymer added to the composition in the first container 1 for pulp. The second stage 5 of the polymer processing start for at least 5 seconds after adding the first polymer. Capacity for pulp equipped with a stirrer, which provide a sufficient degree of mixing of the composition with the added polymer. The composition is directed from the tank 1 to the pulp in the headbox 3. The third stage polymer processing is carried out by adding 6 cationic polymer (e.g., cationic starch) in a flow line through which is in flow-line mixer 7 in the pipeline for the transportation of the composition, and referred to the mixer in the production line is located downstream from the pipeline to transport, but upstream from the headbox. After the third stage polymer processing the first part of the composition, the treated polymer is mixed with the second part of the composition, which is supplied from the vessel 2 for pulp, at a point between valve and pressure box. The composition is then sent from the headbox on a grid conveyor, where it is dewatered and further treated by a method known in this field of production, for the manufacture of paper or cardboard.

A variant is illustrated in figure 1, can is also used for the manufacture of multilayered paper or paperboard, in which only part of the composition for making the middle layer is treated with polymers, whereas the lower and upper layers of paper or paperboard consist of paper pulp, which is not processed.

Example

For the evaluation method used twelve different samples 1-12 compositions. Six samples were partially or completely subjected to three-stage polymer processing. For comparison, the six equivalent samples were left in an unprocessed state. Samples of the compositions contained HTMLM mixed with different amounts of unbleached sulphate pulp of soft wood.

The three stages of polymer processing consisted of the following:

I. adding cationic starch in the sample composition;

II. the addition of CMC in the sample composition;

III. the addition of cationic starch in the sample composition.

After each stage polymer treatment was followed by rinsing. In the polymer processing, thus, received a composition containing two additions of cationic starch and intermediate additive of the CMC.

Samples 2, 4 and 6 were subjected to polymer processing entirely. Samples 8, 10 and 12 were divided into the first part, which contained only sulphate cellulose, and the second part, which contained only TMDM. The first part of each sample is (sulphate pulp) was subjected to polymer processing, while the second part of each sample (TMDM) was left untreated. The first and second parts are then mixed with one another. Samples 1, 3, 5, 1, 9 and 11 are not subjected to any polymer processing.

Then were prepared canvases by dehydration of the composition, determined density (density STFI) and strength values Scott-Bond of all paintings. A measure of the strength of Scott-Bond is a measure of the strength in the direction of the z-axis of the canvas. The results are presented in the table and the chart in figure 2.

SampleDesignation chart 1Chemi-thermomechanical pulp (TMDM), wt.%*Sulphate pulp, wt.%*The proportion of fiber from the total mass to be subjected to polymer processing, wt.%*STFI density, kg/m3A measure of the strength of Scott-Bond, j/m2Increasing the density of the polymer after processing, %The increase in strength of the Scott-Bond polymer after processing, %
1♦110000 510110
210001005401905,642
3♦280200550155
480201006403651458
5♦320800720250
620801005007,750
7♦280200550155
8Δ802020 (only a portion5702803,545
9♦470300565145
10703030 (only a portion of sulphate pulp)5902954,251
11♦56040 0595175
12604040 (only a portion of sulphate pulp)6254304,859
* the percentage of the total fiber content
** the percentage of the total fiber content

The table shows the increase (in percent) indicator of the strength of the Scott-Bond and the density of the sample subjected to three-stage polymer processing, in comparison with the untreated sample. When processing polymers of the composition consisting of 20% cellulose 80% TMDM, as it was made with the sample 4, the density increased by 14%, and the measure of the strength of Scott-Bond increased by 58%. When processing polymers only sulfate of the composition (20%), as it was made with the sample 8, the density increased by only 3.5%strength by 45%. Therefore, even if only 20% of the composition was processed polymers, a measure of the strength of Scott-Bond was increased by 45% compared to 58% when treatment is ode of the entire composition, as the volume increased only by 3.5% compared with 14%.

Figure 2 presents the diagram of the indicators of the strength of Scott-Bond cloths made from samples of the compositions. In the diagram the line drawn between the values for each raw sample and its corresponding equivalent sample subjected to polymer processing. Solid lines on the diagram labeled samples in which the composition was subjected to polymer processing. Dotted lines indicate samples in which only the sulfate portion of the composition was subjected to polymer processing. A steeper slope indicates a greater increase in strength with a smaller increase in density.

As shown in figure 2, the dashed line is more steeply inclined than the solid line. Polymer processing only sulfate of the composition leads thus to a significant increase in strength, but the density remains almost constant. As shown in solid lines, when the polymer processing of the entire composition observed a greater increase in strength than after partial processing, however, the density of paintings, molded from the fully processed composition is also increased to a greater extent than is observed after partial processing.

The results observed in paintings formed the C samples 8, 10 and 12, which were subjected to polymer processing according to the invention, therefore, show that unexpectedly high strength while maintaining a low volume obtained when a small amount of polymers.

Example

Manufactured cardboard, consisting of three layers. The composition from which were formed the top and bottom layers of cardboard, consisted of 50% pulp from solid (hardwood) wood and 50% pulp from soft (pine) wood, the number of SR (SR - degree of grinding) was approximately 27.

The composition from which was formed the middle layer of cardboard, consisted of 55% HTMLM and 45% of the mixture, which is below named part mixed, and the mixed part consisted of approximately 55% bleached pulp from soft (pine) wood, 15% bleached pulp from solid (hardwood) wood and 30% TMDM. Cardboard, the middle layer which consisted of TMDM and the above-mentioned mixed part, is a typical cardboard, which is made containers for liquids.

Have produced five different samples of cardboard. In two of the samples of the whole composition, which is used to make the middle layer, processed polymers during three successive stages (two stages with the addition of cationic starch and one intermediate stage to add the group COMC). The other two samples were processed according to the invention, i.e. only the mixed part of the composition (45% of the entire composition) were treated with polymers during three successive stages, and processed mixed part then mixed with the raw part TMDM. One sample was used as reference, which was not subjected to polymer processing.

The amount of polymer, which was added in each stage was determined by measuring the z-potential. First I added a small amount of cationic starch and constantly measured z-potential; when the value of the z-potential is stabilized, it is meant that the quantity added is appropriate. Then the same method was added anionic COMC, and when the value of the z-potential was close to zero, it meant that the added amount is appropriate. The amount of polymer added in the next stage, was determined in the same way. Between additions of polymers did not do a rinse composition.

The amount of polymer added to the composition during processing of the composition during three successive stages, as follows: 15 kg/t of cationic starch in the first stage; 1.5 kg/t CMC in the second stage and 10, respectively 15 kg/t of cationic starch in the third stage.

When processing only the mixed part of the composition during the three follower who's stages added: 15 kg/t of cationic starch - in the first stage; 1.5 kg/t CMC, in the second stage and 15, respectively 20 kg/t of cationic starch in the third stage. These quantities were calculated in relation to the mixed part, which amounted to 45% by weight of the entire composition. Thus, the amount of added polymer, based on the entire weight of the composition, amounted to 6.75 kg/t of cationic starch in the first stage; 0,675 kg/t CMC in the second stage and 6.75, respectively 9, kg/t of cationic starch in the last stage.

In the processing of pulp during three successive stages of the first two polymer additives produced in the tank for pulp, and the latest addition of cationic starch produced in production lines in the pipeline.

Measured strength values Scott-Bond samples of cardboard; the results are presented in chart 1.

Chart 1 shows that the strength of cardboard in polymer processing only the mixed part of the composition during three successive stages even higher than the strength of cardboard, obtained from the composition, fully processed polymers during three successive stages, even though the number of added starch was less.

Determined the density of cardboard. Figure 2 shows the results of the measured strength of the Scott-Bond in comparison with the density.

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Figure 2 shows that the density of cardboard treated with polymers, is saved in comparison with a reference sample, although the strength of the cardboard has increased.

Therefore, these tests, the results of which are presented in charts 1 and 2 show that it is preferable to process only part of the song, as the result cartons with high durability when stored volume, while the number of added polymers reduced.

1. A method of manufacturing paper or cardboard product, including:
providing paper pulp containing fibers;
polymer processing the first part (1) paper pulp, in which polymers are added to pulp in the course of performing at least two stages;
mixing the aforementioned first part subjected to polymer processing, from raw second part (2) paper pulp;
dewatering of paper pulp on a grid conveyor for forming fibrous web.

2. The method according to claim 1, in which is mentioned the first part of the paper pulp is 20-80% of the total mass.

3. The method according to claim 1 or 2, in which is mentioned the first part of the paper pulp containing the long fibers present in the paper pulp.

4. The method according to claim 1 or 2, in which the mentioned first h is any paper pulp contains sulphate or sulphite pulp fibers soft (pine) wood.

5. The method according to claim 1, in which paper pulp contains fillers and, optionally, other additives used in the manufacture of paper, with fillers and additives injected polymer after processing mentioned the first part of the paper pulp.

6. The method according to claim 1, in which paper pulp contains fillers and, optionally, other additives used in the manufacture of paper, with fillers and additives introduced to polymer processing mentioned the first part of the paper pulp.

7. The method according to claim 1, wherein the polymer used in each of the successive stages of polymer processing, interacts with the polymer used in the subsequent stage.

8. The method according to claim 1, wherein at least one of the stages of polymer processing includes adding anionic polymer and at least one of the stages of polymer processing includes adding a cationic polymer.

9. The method according to claim 8, in which the anionic polymer is carboxymethylcellulose (CMC).

10. The method according to claim 8, in which the cationic polymer is cationic starch.

11. The method according to claim 1, wherein the polymer treatment is carried out in two to seven furlongs.

12. The method according to claim 10, in which the polymer treatment is carried out in three to seven stages.

13. Cardboard product manufactured according to the method according to claim 1.

14. Paper manufactured according to the method according to claim 1. /p>

 

Same patents:

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26 cl, 5 tbl, 3 ex

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33 cl, 10 dwg, 22 tbl

Composition // 2347030

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22 cl, 9 tbl, 9 ex

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7 cl, 2 tbl, 10 ex

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30 cl, 2 dwg, 3 tbl, 3 ex

The invention relates to a method of manufacturing down with superior adsorption capacity and to Pooh obtained in this way

The invention relates to a method of manufacturing absorbent material with superior adsorption capacity, absorbent material obtained in this way, and absorbent articles containing such material

The invention relates to the production of a composite fiber material having a high hydrophilic properties and intended for use in various fields of national economy in the manufacture of products to which the requirements of high sorption capacity, capillary transport and filtration properties

Absorbent napkin // 2129181

FIELD: textile; paper.

SUBSTANCE: described is product, which has Brookfield viscosity within from approximately 700 to approximately 2500 cps, measured in accordance with method CRA B-54 with 0.5% of hard phase using spindle No 21 at 20 rot/min and temperature 97°C and method of obtaining starch products. Also described is application of cationic transversally bound wax-like starch products, which have Brookfield viscosity within from approximately 700 to approximately 2500 cps, in production of paper products, characterised by productivity 1.9 rolls per hour and inner binding strength 19.5 kPa/cm2.

EFFECT: described is cationic transversally bound wax-like starch product.

32 cl, 14 ex

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