Production of paper using latex with agglomerated hollow particles

FIELD: textile; paper.

SUBSTANCE: method relates to production paper material and can be applied in paper-and-pulp industry when producing paper material with low-density. Method includes formation of aqueous suspension containing pulp. Addition of latex with agglomerated hollow particles in suspension. Formation of a wet sheet from the suspension and drying of the sheet. It also relates to paper material prepared by using the method.

EFFECT: production of paper material having good combination of optical, mechanical, tactile properties, evenness and volume including economical efficiency of the process.

10 cl, 6 dwg, 2 ex

 

Background of invention

This invention relates to the manufacture of paper products, with low density.

The technology of paper production is very ancient. In recent years there has been an increased demand for printing paper, with exceptional physical properties. On the other hand, there is a large demand for weight reduction in this paper in order to reduce the cost of its transportation and distribution. These requirements were historically contradictory, given the fact that high-quality paper usually has a high density of base paper and the increased weight of the coating, if the coating is applied. Paper with low density can be selected in order to reduce the weight of it made of paper products, but this is not the ideal solution, as it can lead to the refinement of the paper and reduce feelings of the masses ' expected (to the consumer) from paper products. In addition, by reducing the weight of the paper it is desirable to maintain the rigidity of the paper at a lower thickness of the sheet. For these reasons, currently on the market demand of high-quality paper products, which give the paper an increased thickness when the paper weight or low density paper of this thickness.

As is well known, during manufacture the Oia paper and similar products, such as cardboard, to improve the quality of the final product in fibrous cloth include inorganic fillers. Fillers are important to improve the printing properties of paper by improving the surface characteristics, and the use of appropriate filler significantly increases the opacity and brightness of paper. Many inorganic materials, as has been known for a long time, are effective for this purpose, but despite the effectiveness of these inorganic fillers having low density, and later for them to look for many different substitutes.

Modern manufacturers of paper constantly looking for ways to obtain paper having low density while reducing the desired mechanical properties, thermal and optical properties. We tested different approaches, including the use as fillers of various organic and inorganic materials.

The use of polymeric microspheres as fillers for carton disclosed in U.S. Patent No. 6379497 B1. U.S. patent No. 2002/014632 A1 discloses the use of expandable microspheres in the manufacture of opaque pigment paper. U.S. patent No. 2001/0038893 A1 reports that expandable microspheres can be used in the manufacture of cardboard material with n is scoi density and having insulating properties. Japanese published patent application 2000-053351, 01-210054 and 11-006466 discloses the use of hollow polymer particles as additives used in the wet stage of the paper production, where the hollow particles are cationic particles in nature. Japanese published patent application 2000-160496 clarifies the use of the composite hollow particles in the implementation of the wet stage of the process of paper production, obtained by adsorption of amphoteric polyelectrolyte with a high molecular weight on the surface of the hollow particles. However, it is advisable that the number of processed composite hollow particles, which remains in the paper, was low. Additives used in the manufacturing process of the paper must be held by a sheet of paper for proper functioning. U.S. patent No. 6139961 discloses the introduction created in crude leaf hollow spherical inorganic pigment to increase the strength and opacity of paper.

The problem of low-cost production of paper products having a large volume and high optical properties while maintaining acceptable mechanical properties, the prior art has not been solved.

The invention

The present invention includes a method for creating a paper material, and the method includes, in the BOJ creating a water suspension, containing mainly cellulose fibrous mass, the formation of the wet sheet from the slurry and drying the sheet, and this improvement involves the use of a suspension agglomerated hollow particle latex. The invention also includes a composition containing agglomerated hollow particle latex and paper materials, manufactured using the method according to the invention. The present invention provides paper materials with a good combination of optical and mechanical properties, tactile properties, smoothness and volume.

Brief description of drawings

1 and 2 are electron micrographs agglomerated hollow particle latex.

Figure 3 shows the graphs of the distribution by size for hollow latex particles and agglomerated hollow particle latex.

Figure 4 is a line graph of the dependence of the volume of paper percentage loading of filler.

Figure 5 is a line graph of the dependence of the opacity of paper TAPPI (Technical Association of paper industry U.S.) percentage loading of filler.

Detailed description of the invention

In the method of manufacturing paper according to the invention is used agglomerated hollow particle latex, which mo is but to get out of hollow latex particles.

Latex with hollow particles are widely known and commercially available. Latexes with hollow particles used for the preparation of agglomerates, can be obtained using any suitable methods. Many such methods are well-known specialists in this field of technology. For example, consider a U.S. Patent No. 4427836, 4594363 and 5157084. Hollow latex particles may have a core containing an acid or acid-free core. Examples of latexes with hollow particles include brand latex HS 3000 used by the Company "Dow chemical", and the mark of the latex Rhopaque HP 1055 used by the Company Rohm and Haas". Mainly, with hollow latex particles used in the process of agglomerating, has an average particle size of 0.1-10 microns. The particle size distribution of hollow latex particles used in the method of agglomerating, is not decisive for the efficiency of the agglomerated hollow particles as a filler in coatings for paper.

The most widely produced latexes with hollow particles have 20-40 wt.% the solids. A wide range of possible volumes of voids in hollow latex particles provides a wide range of densities filler. It is preferable that the range of volume of voids of hollow latex particles ranged from about 10 to about 70 vol.%, more preferably is from about 30 to 60 vol.%, and most preferably from about 40 to about 55 vol.%. You can use a mixture of latexes with hollow particles. In one variant embodiment of the present invention, the agglomerates can be prepared from a mixture of latex with hollow particles and other fillers.

For sintering of hollow latex particles used tool for agglomeration of the particles. Selection means for agglomeration of the particles is determined by the desired charge or Zeta-potential of the agglomerated hollow particle latex. Suitable means for agglomeration of particles include, for example, cationic surfactants, such as cetylpyridinium, Quaternary ammonium salts and ethoxylated ammonium salt; positive, negative, or afterno charged polyelectrolytes, such as nationalease starch, cationic polyacrylamide, polyethylenimine (PAYS), polyacrylamide-acrylic acid, poly(diallyldimethylammonium chloride) (PDADMAC) and the like; neutral water-soluble polymers, such as, for example, polyethylene oxide (PEO) and partially hydrolyzed polyvinyl acetate; and agglomerated salt, such as, for example, calcium chloride, zinc chloride, chloride aluminum and ammonium sulfate. Colloidal stable particles, which stick to the hollow particles are also suitable means for agglomeration of the particles. Examples suppose the equipment funds for agglomeration of particles include pyridinium chloride and poly(diallyldimethylammonium chloride). You can use a mixture of tools for agglomeration of the particles. Means for agglomeration of particles is used in a quantity sufficient for the formation of agglomerated particles with an average particle diameter larger than the average particle diameter not agglomerated latex. The amount for the agglomeration of particles is mostly sufficient to convert at least about 30 wt.% solid phase hollow latex particles in the agglomerates, it is preferable that this number was at least about 50 wt.%, more preferably, at least about 75 wt.%, and most preferably at least about 90 wt.%. Is preferred to be used is about 0.01 to about 1.0 g funds for the agglomeration of particles per 1 g of the solid phase of hollow latex particles, and more preferably from about 0.03 to about 0.5 g of product for agglomeration of particles per 1 g of the solid phase of hollow latex particles.

The agglomeration is carried out by bringing into contact the means for agglomeration of particles with latex, with hollow particles, under conditions sufficient for sintering of hollow latex particles. It is preferable that the bringing into contact the means for agglomeration of particles with latex, with hollow particles was conducted at room temperature and the atmospheric pressure with agitation. To achieve the desired density of the agglomerate can be advantageous to adjust the amount of the solid phase of hollow latex particles intended for the sintering process. You can glomerulopathy hollow latex particles in the workplace for the manufacture of paper.

Agglomerated hollow particle latex after their formation can be further modified with the addition of a stabilizing agent. The purpose of adding a stabilizing agent is to prevent the further increase of the particle size due to the maturation process or further agglomeration, due to the high shear coagulation. Examples of suitable stabilizing agents include water-soluble polymers, such as, for example, polyvinyl alcohol, carboxymethylcellulose, and starch. The preferred stabilizing agent is polyvinyl alcohol. You can use a mixture of stabilizing agents. The amount of the stabilizer is preferably about 0-40 wt.% on the basis of the dry mass of the solid phase in the hollow latex particles.

The agglomerates used in the invention are agglomerates of hollow latex particles containing hollow particles. Agglomerated particles are usually messy and uneven. It is preferable that the agglomerated particles of the latex had a solids content is ome from 1 to 30% of the solid phase. As in the case of latex with hollow particles, the amount of solid phase in the agglomerated hollow particle latex used in the wet stage of the process of paper production, is not significantly crucial factor due to the strong dilution, which are agglomerated hollow particle latex when it is used as filler at the wet stage of the process. In one variant embodiment, the agglomerated hollow particles can be used in the form of dried redispersible powder. The latex from the agglomerated hollow particles may be the density is less, and a particle size of more than latex, which can be obtained using the standard technology of emulsion polymerization. The larger size of the latex particles with the agglomerated hollow particles, it is advantageous that the units easier to keep in the sheet during the process of paper production.

In one variant embodiment of the invention, the agglomerates can profitably be used directly in existing formulations of paper, without the use of additional adjuvants, such as retaining additives, and without modifying the surface of particles. In other variant embodiments of the invention can be used with additional adjuvants. If the agglomerates are not held, the accumulation of filler in the aqueous fibrous composition cutback system, corresponding to the process of paper production, will ultimately have a negative impact on the efficiency of the filler. It is advantageous that the number of agglomerated hollow particle latex, held in paper products amounted to at least about 80 wt.% based on the weight of latex with agglomerated hollow particles are added during paper production. In different embodiments of the invention withholding amount is at least about 85 wt.%, based on the weight of latex with agglomerated hollow particles are added during paper production, at least about 90%, or at least about 95%.

You can add retaining additives to improve retention agglomerated voids. Cationic retention additives are preferred, but you can use and anionic additives. Suitable retaining additives well known to experts in the art and include materials such as, for example, polyacrylamide and a water-soluble polymeric reaction products of epichlorhydrin. Suitable materials of this type are produced commercially under the brand names of PERCOL, KYMENE or CASCAMID.

It is preferable that the agglomerated hollow particle latex had an average particle size of about 3 to 100 microns, more p is edocfile 5-80 microns, and most preferably about 5-50 microns. The stability of the agglomerates is determined by monitoring the distribution of particles made by the method of light scattering, after rupture of the agglomerate in a high-speed shredder for one minute. It is preferable that the distribution of particles agglomerate size and distribution of particles under the action of the mixer was not changed. You can use a mixture of latexes with agglomerated hollow particles.

The volume of voids of hollow latex particles, along with the interparticle voids in the filler allows you to adjust the tightness of the latex with the agglomerated hollow particles to the density of the concrete filler required for a given paper products. It is preferable that the total volume of voids in the filler was approximately 30 to 90 vol.%, and more preferably about 40-80%vol.

Latex with agglomerated hollow particles can be stabilized by surface-active substance or a water-soluble polymer that interacts with the surface of the agglomerate. The total surface charge of the latex with the agglomerated hollow particles can be either negative or positive. Agglomerated hollow particle latex can be further characterized as having positively is m, neutral or negative Zeta-potential.

The process of paper production is well known to specialists in this field of technology. Latex with agglomerated hollow particles are successfully used as filler in the implementation of the wet stage of the process of paper production. Adding chemicals and filler corresponding to the wet stage, can be done in various ways. Latex with agglomerated hollow particles can be added to the wet stage at any place, for example, formed with a damp cloth, fan pump, thick bypass pipeline for paper pulp, or any other work area in a paper machine, or any combination of these sites. It is preferred to add the agglomerated latex is in the process area where the paper pulp is diluted, for example, in the mixing tank, the fan pump or in front of the main camera. Alternatively, you can add agglomerated latex in the place where the concentration of the fibrous mass is high, such as, for example, thick bypass pipeline for paper pulp or mixing tank.

The number of agglomerated particles used in the process of paper production, depending on the cultivar made of paper and is limited by the amount of filler material with a low energy density is steadily increasing. It is preferred that the level of use of agglomerated particles was approximately 0.5 to 50 parts agglomerated hollow particle 100 parts of pulp, more preferably about 0.75 to 25 parts, and more preferably about 1-20 parts. Latex with agglomerated hollow particles can be used as the sole filler or can be used in conjunction with other fillers, such as synthetic kaolin type Mahavite, titanium dioxide, ground calcium carbonate, precipitated calcium carbonate, and also including the low density materials, such as, for example, with hollow latex particles, calcium carbonate, hollow particles or soda kaolin clay. In different embodiments of the invention, the latex with the agglomerated hollow particles include at least about 10 wt.% the total number of filler, at least about 20 wt.% the total number of filler, at least about 50 wt.% the total number of filler, or at least about 80 wt.% the total number of filler.

Use with latex agglomerated hollow particles may lead to the production of paper, with a unique combination of properties, such as size, opacity and brightness, compared to paper, is received using only mineral pigments or solid mineral pigments.

A particular variant embodiment of the invention

The following options are included to illustrate the invention and do not limit the scope of the claims. All share and percentage are given in mass ratios, unless otherwise noted.

Example 1:Preparation of starting materials for latex with agglomerated hollow particles:

HS3000 (CAS#214154-63-9) from the Company "Dow chemical".

The monohydrate of cetylpyridinium chloride (CP) (CAS#6004-24-6) from Sigma Aldrich, St. Louis, Missouri, USA.

Polyvinyl alcohol (PVOH) (CAS#9002-89-5) from Sigma Aldrich".

Deionized water (CAS#007732-18-5)

Prepare the initial solution containing 8.7% of dry PVOH. The PVOH solution before using heated and stirred to ensure good dissolution and uniform mixing, and then the solution is subjected to cooling to room temperature before adding it to the latex agglomerates.

HS3000 (10% dry matter, 40O g) is added to the container 900 ml (external diameter 3.5", height 7,0"). Latex mechanically stirred at 400 revolutions per minute (vane impeller: outer diameter of 1.5" with alternating rectangular teeth the size of l"x0,4", parallel mixing shaft), while CP (0,28 M, 80 ml) is added over about 20 minutes. For the preparation of agglomerated latex latex cm is camping after complete addition CPH for 4 hours, stirred at room temperature. Then add 120 g of the original PVOH solution with continuous stirring for about 3 to 5 minutes. The mixture (at the moment agglomerated) continue to stir at room temperature for about 40 minutes. After mixing, the size of agglomerated particles in the wet state is measured by dynamic light scattering. Alternatively, to determine the size of agglomerated particles in the dry state using electron microscopy, which can also be used to determine the morphology of the dried agglomerated particles.

Scanning electron microscopy (SEM) is carried out using SEM-machine Array-1810 at an accelerating voltage of 20 kV. For analysis prepare thin samples by adding two drops of latex with agglomerated hollow particles obtained above, 20 ml of deionized water. Diluted samples then drop by drop add on the object table of a scanning electron microscope, dried at room temperature overnight and subjected to plasma spraying on a thin layer of gold to increase conductivity and contrast of the polymer sample under the action of the electron beam.

1 and 2 show views of the morphology of the condensed sample, giving the picture of distribution of alomari avannah particle size. Figure 2 shows the morphology of tightly Packed agglomerated particles and, in addition, it shows the diameter of the peripheral circumference of specific agglomerated particles of approximately 10 microns.

Figure 3 analysis of the size, distribution and partial conversion with hollow latex particles in the latex with the agglomerated hollow particles using dynamic light scattering (System determine the distribution of particle size, "Accurizer Inc., Model 770"). Samples are prepared for analysis by adding 1 drop of the above-described latex with agglomerated hollow particles to 20 ml of deionized water. Using the computer recorded data on the distribution of particle size, suspended in the number and volume of particles. Profile of quantitative distribution suggests that there remains a small percentage not agglomerated primary particles; however, the number not agglomerated primary particles is very small. For a better illustration of increasing the overall size of the particles during sintering figure 3 shows the spatial distribution of particle size for both agglomerated and whether the sample. It is clear that the primary particles into aggregates of a size of 10-30 μm (based on the diameter of the peripheral circle). These results are in the accordance with those which were detected by SEM in figure 1.

Example 2:Preparation of a casting sheet of paper manually from latex with agglomerated hollow particles

Sheets of paper, hand-made, obtained using British standard semi-moulds for the manufacture of sheets of paper manually according to TAPPI method T-205 sp-95 (method, developed by the Technical society of the pulp and paper industry, TAPPI (Technical Association of Pulp and Paper Industry)), to test the effectiveness of latex with agglomerated hollow particles. As a control filler used precipitated calcium carbonate, adopted as a working standard. Also, to compare the effectiveness of fillers with different downloads prepare "clean" (i.e. without added filler) sheet, made manually.

The leaves for this example, marked as follows:

AGG - Latex with agglomerated hollow particles from Example 1

CaCO3- control filler: PCC, Albacar®, mineral filler scalenohedral form from the company "Specialty minerals")

Clean (without filler, this sample is shown in the graphs as points on a graph with 0% filler)

Each sample is treated with three different concentrations of the filler (6%, 10% and 15%, based on the weight of the paper with filler). In the e added fillers calculated on the basis of their mass in the dry state. As the target density of the paper using a density equal to 80 lbs/3300 ft2or 118 g/m2.

Basic boot material used for making paper, is taken in a 50/50 mixture of hardwood and soft wood, purified according 420-mu Canadian standard of fineness of grind. All sheets of paper in this example is made from the same pulp purified wood pulp. Mix approximately 20 l wood pulp, taken at 0.5%consistency, and from this sample receive a measured amount of wood needed for each set of sheets of paper made by hand. To determine the quantity required for each sample, grease fillers are made in two copies for each base of the boot material.

For each load of filler prepare a mixture of fibrous material and filler. To control PCC filler CaCO3weigh and together with dilution water volume of 700 ml is placed in a mixer for one minute. Filler for latex with agglomerated hollow particles is weighed, diluted and placed in a mixer for 1 minute, along with antifoam ANTIFOAM 1410 (Dow Corning - silicone compound) for regulating the potential of foaming that occurs when mixing. Then on Omnitel added to the fibrous slurry and diluted to 8.0 liters

A sample volume of 500 ml each of a mixture of fibrous mass/filler then measured and placed on a magnetic stirrer. To the mixture of cationic retention additive PERCOL 292 in the number one pound-retaining additive per ton of the mixture of fibrous material/filler and stirred for 30 seconds. Then run the British standard semi-automatic mold for the manufacture of sheets of paper manually in the mold and pouring the mixture of the fibrous mass/filler/retention additive. The mold sheet, manufactured manually, fill to the desired height, start stirring, followed by a stage of settling, and subjected to drying. Then the sheet is removed from the grid paper machine. Twelve sheets of the stack and compress at the same time to obtain sheets of paper made by hand.

The percentage of filler with agglomerated hollow particles in the sheet of paper, hand-made, determined by pyrolysis of solids remaining in the water after compression plates. The solid phase remaining in the water from a particular sample, dried and determine the percentage of these solid phases. Sample mass of 1 mg of this residue is then subjected to pyrolysis at 700°C. the Amount of the latex is determined by comparing the peak areas corresponding to Stero is, in the remaining samples, with the peak areas corresponding to the latex used in the experiment. As was identified in the water samples contain in their balance of less than 3 parts per million of latex. Initial level of latex in water up to 100 parts per million, which means that the paper sheets, handmade, contains more than 97% of the latex with the agglomerated hollow particles.

Assessment of the effectiveness of the final application of the invention in paper production

Was the comparative analysis of the fillers with the use of sheets of paper received manually. The following data exemplify the exceptional performance of the filler in the form of a latex with agglomerated hollow particles compared with a filler in the form of precipitated calcium carbonate, especially from the point of view of ability to increase the amount and optical properties. For each of the types of samples were received twelve leaves, hand-made, and confirmed the properties concerned in an average of 10 sheets, taking into account repeated measurements of testimony on every sheet.

The volume of the sheet is measured as the ratio of its thickness to the thickness of the paper. The thickness is measured in mils (one thousandth of an inch), and the paper weight is determined by weighing of the sheet in grams and dividing this value by the area of the sheet, expressed in square IU the arts. The scope is then calculated by dividing the thickness paper weight and multiplying these values by 25.4 for the expression units of the specific volume in cm3/, Impact loading of filler in the amount shown graphically in figure 4. Maximum capacity to increase the volume of paper being with latex agglomerated hollow particles is obvious.

The opacity of the sheets of paper produced manually measured by TAPPI method T. The results depicted in figure 5, where it is shown that the latex with the agglomerated hollow particles exceeds a clean sheet and precipitated calcium carbonate when all downloads filler. The brightness of the sheets of paper produced manually measured by TAPPI method Kzt452. The results are shown in Fig.6 (a dependency of brightness according to TAPPI from boot filler), where it is shown that the latex with the agglomerated hollow particles is superior in brightness precipitated calcium carbonate, as well as a clean sheet at all concentrations.

It has been found that partial substitution of agglomerated hollow particles of mineral filler sheets of paper, handcrafted, sleeker and seem softer to the touch (velvety).

1. A method of manufacturing a paper material, which includes the formation of a water suspension containing predominantly cellulose in Akniste mass, the formation of the suspension of the wet sheet and drying the sheet, characterized in that it involves the use of a suspension of latex with agglomerated hollow particles.

2. The method according to claim 1, characterized in that the agglomerated hollow particles have an average particle size of from about 3 to about 100 microns.

3. The method according to claim 1, characterized in that the agglomerated hollow particles are cationic surface charge.

4. The method according to claim 1, characterized in that the agglomerated hollow particles have an anionic surface charge.

5. The method according to claim 1, characterized in that the agglomerated hollow particles have a neutral surface charge.

6. The method according to claim 1, characterized in that the use of additional filler and agglomerated hollow particles contain at least 10 wt.% the total amount of filler used.

7. The method according to claim 1, characterized in that the agglomerated hollow particles produced from hollow latex particles with the volume of the internal cavity in the range 10-70% of the volume of the latex particles.

8. The method according to claim 1, characterized in that the agglomerated hollow particles have a total volume of the internal cavity in the range of 30-90%.

9. The method according to claim 1, characterized in that the agglomerated hollow particles modify by adding a stabilizing agent.

Any material, obtained by the method according to claim 1.



 

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1 dwg

FIELD: textile, paper.

SUBSTANCE: paper material and method of its production are designed for the production of paper products such as file folders and can be used in pulp and paper industry. The paper material contains cellulose fibers and expanded microspheres in the amount of approximately 0.1-0.4 wt % and 5.1-6.0 wt % of the web total dry weight; the paper web has the density equal to or exceeding about 6.0 pounds per 3000 square feet per mil. Method of manufacturing this material involves preparing composition for paper production containing cellulose fibers and expanded microspheres in the above amount, forming a fibrous web from this composition, web drying and calendering up to the above thickness.

EFFECT: preventing skin cuts, improving flexibility and stiffness of paper material.

29 cl, 25 dwg, 14 tbl, 8 ex

FIELD: pulp-and-paper industry, in particular, paper sheet having surface feeling hash to the finger, and method for applying coating onto paper sheet.

SUBSTANCE: paper sheet of such structure may be used for manufacture of paper or plastic medium for carrying of printed information, paper or plastic package, cover used in stitching and binding processes, or cardboard or plastic carton having surface feeling hash to the finger. At least one side of paper sheet is coated with layer containing non-compressible microscopic particles of non-gelatinized starch grains, or said particles are produced by grinding of plastic material. Method involves treating at least one side of paper sheet with water-based composition containing non-compressible microscopic particles which are made three-dimensional and rounded, binder, and filler; drying paper sheet after treatment. Particles are non-gelatinized starch grains, or particles are produced by grinding of plastic material. Method allows paper sheet to be produced, which has roughness coefficient Kd below 0.5.

EFFECT: simplified method and improved quality of paper sheet.

17 cl, 16 dwg, 1 tbl, 3 ex

FIELD: paper coated with composition for coating various kinds of paper, for offset printing of paper used for manufacture of books, magazines, annual reports, or packaging paper.

SUBSTANCE: composition comprises pigments and binder. Composition pigments are formed as microballs having sizes below 10 micrometers, preferably about 7 micrometers. Paper coated with such composition is silky by touch and has at least one surface coated with such composition, preferably both of its surfaces. This paper may be tracing paper.

EFFECT: improved quality of paper owing to preventing sliding thereof during separation of sheets in stacks, delamination of coating during printing process and, accordingly, elimination of paper dusting and formation of impure imprints.

7 cl, 2 dwg, 2 tbl, 13 ex

The invention relates to thermosensitive recording materials, in particular paper and taking into account the major area of application is the production of business and securities can be attributed to the means of their protection against forgery
The invention relates to the production of paper containing various means of protection against counterfeiting and unauthorized manufacture, and more particularly to securities with protective means, the action of which is based on the phenomenon of thermal sensitivity, t

FIELD: medicine.

SUBSTANCE: absorbing cloth from a cellulose fiber contains an admixture of hard wood and soft wood fibers located in the form of mesh structure, including: the set of columnar areas fibers conglomeration with relatively high local density, aggregated by means of set of the connecting areas with lower local density, where orientation of fibers is inclined along a longitudinal direction between the columnar areas interconnected in a such way, where the cloth possesses coefficient of elongation in a cross-section direction, which is at least in 2.75 times higher than relative strength at cloth stretching in a dry condition. The above-stated material is obtained as follows. A water cellulose composition from hard wood fibers is prepared. The composition is moved on a forming tissue in the form of a stream which is let out from a pressure head box with a flow rate. The composition is dehydrated and compacted for manufacturing of a paper for formation of the fibrous layer possessing chaotic distribution of a fiber for paper manufacturing. Packing of the dehydrated fibrous layer possessing chaotic distribution of a fiber on the transporting transferring surface moving with the first rate. Creping of a fibrous layer from the transferring surface on a tape at dryness from 30% to 60% with use of the pattern creping tape. The creping stage is carried out under pressure in a contact zone of the creping tape confined between the transferring surface and the creping tape. Thus the tape is moved with the second speed, lower than speed of the transferring surface. Tape drawing, parametres of a contact zone, speed difference and dryness of the fibrous layer are chosen in such way to crepe the fibrous layer at its removal from the transferring surface and to redistribute on the creping tape with formation of a fibrous layer with mesh structure. Drying of the fibrous layer is performed after. The process is regulated so that coefficient of elongation in a cross-section direction is, at least, approximately in 2.75 times higher than relative strength at stretching of the fibrous layer in a dry condition. Such method allows obtaining a cellulose fibrous layer for products made from thin paper, and also products in the form of towels.

EFFECT: improvement of ready product quality and power consumption decrease.

33 cl, 10 dwg, 22 tbl

Composition // 2347030

FIELD: textiles; paper.

SUBSTANCE: composition is meant for improving the softness of paper products. Composition includes: (i) oil, fat or wax; (ii) at least one non-ionic surfactant; (iii) at least one anion compound, selected from anionic micro-particles and anionic surfactant; (iv) at least one polymer, which is a cation, non-ionic or amphoteric, where the non-ionic surfactant is added to the amount from about 60 to 1000 weight fractions for 100 weight fractions of the polymer. Composition is used in the method of manufacturing paper (versions). Method includes adding the mentioned composition to a cellulose suspension or to a moist or dry paper fabric.

EFFECT: increase in the quality of the paper products due to the increase in its softness, low resistance to tearing and high speed of getting wet and reduction in energy for pulping.

22 cl, 9 tbl, 9 ex

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: textiles, paper.

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

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

30 cl, 2 dwg, 3 tbl, 3 ex

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