Method to produce paper product

FIELD: textile, paper.

SUBSTANCE: paper product includes at least two layers. The method includes the following: (i) provision of aqueous suspension that contains cellulose fibres; (ii) adding microfibrillar polysaccharide into suspension in amount sufficient to produce from approximately 0.05 to approximately 50 wt % relative to mass of cellulose fibre; (iii) dehydration of the produced suspension and moulding of the first layer, which has density from approximately 150 to approximately 500 kg/m3, of the specified layer paper product. Also refers to a version of the method for production of a layer paper production, and also to a layer paper product itself (its versions) and to application of a layer paper product.

EFFECT: improved ability to bind fibres in at least one inner layer of a paper product, improved resistance to product bends, higher compression strength, resistance to lacing, bend, Z-strength, stiffness index, compression strength in case of lower density of a paper product.

23 cl, 7 tbl, 5 ex

 

The present invention relates to a method for producing laminated paper products, especially laminates cardboard. The invention also relates to a laminated paper product that can be obtained this way, and to its use.

Background of the invention

Currently research in papermaking industry is focused on reducing the mass of a unit of production of paper or cardboard products while maintaining their mechanical properties. This General direction is very important in both economic and environmental reasons. In order to receive a paper or cardboard products with a lower weight per unit of production it is preferable to use fibers of low density. However, one disadvantage of such cellulose fibers is their poor ability to form strong relationships fiber-fiber that, in turn, results in insufficient strength properties.

WO 00/14333 refers to the way in which the latex is used as a binder in the bulk layer to improve mechanical properties. However, WO 00/14333 suffering from high amounts of essential chemicals, as well as problems relating to the application of the latex binder. As an example, if the latex is introduced into the raw end, the problem of retention of latex on the fiber is x can cause problems with the application, and the violation of the equilibrium chemistry of the wet end. Application problems can also occur if the latex is introduced into the already molded layers of paper or paperboard using existing equipment. Latex can also cause problems associated with dissolution. One purpose of the present invention is to provide a method of producing paper or cardboard layered products low density while maintaining essentially the properties of strength and/or stiffness. Another objective of the present invention is to provide a paper or cardboard layered products of low density, which can be dissolved in conventional pulpers. Another objective of the present invention is to provide a method of producing paper or cardboard laminate with improved ability to bind fibers in at least one inner layer. Another objective of the present invention is to provide a paper or cardboard laminate, which has improved wrinkling. Another objective of the present invention is to provide a paper or cardboard laminate, which is improving at least one property of the paper, including the compressive strength, resistance titilayo with respect to hydrogen peroxide, the rate of resistance to bending, Z-strength and rigidity index. In particular, the order n of the present invention is to provide a paper or cardboard laminate, especially a laminate of low density or a laminate containing at least one layer of cardboard low density, which has superior compressive strength, as well as an indicator of resistance to bending and/or resistance titilayo edge.

The invention

The present invention relates to a method for producing a laminated paper product containing at least two layers, and the method includes:

i) providing a water suspension containing cellulosic fibers,

ii) adding to the suspension microfibrillar polysaccharide in number with the expectation of obtaining from about 0.05 to about 50 wt.%. in relation to the weight of cellulose fibers,

iii) dewatering the obtained suspension and forming the first layer, having a density of from about 150 to about 500 kg/m3specified layered paper product.

The present invention also relates to a method for producing a laminated paper product containing at least two layers, and the method includes:

i) providing a water suspension containing cellulosic fibers,

ii) introduction to the suspension microfibrillar polysaccharide in number with the expectation of obtaining from about 0.05 to about 50 wt.%. in relation to the weight of cellulose fibers,

iii) dewatering the obtained suspension and for the Finance, at least first and second specified layer of the laminate, therefore, at least one of the at least first and second layer is formed from the aqueous suspension obtained in stage (ii), containing microfibrillar polysaccharide; and the connection of these layers so that the coated article has a density of from about 150 to about 800 kg/m3.

Formed of paper or cardboard layers can be connected by any conventional method, including the methods discussed in WO 00/14333.

Forming a layer, such as a specified first layer includes compressing the layer formed, for example, by clamping the press, which can increase the density of the layer. Pressing can be thus used to adjust the density of the obtained layer (s). In addition, the selection of a suitable slurry may be important for obtaining a molded layer of the desired density. According to one variant of implementation, at least one layer may be formed and laminated on a separate stage prior to lamination with another layer. After the stage of pressing the laminate may be dried in conventional drying equipment such as a cylindrical dryer with or without a drying wire/cloth, air dryer, metal tape, etc. After drying or during drying the laminate m which may be covered by another layer.

The term "layered paper product" refers to at least two layers of paper and/or cardboard. However, layered paper product may also include layers of other material other than paper and/or paperboard, including films of various polymers, such as polyethylene, polypropylene, complex, polyester, polyvinyl chloride and/or polyvinylidenechloride, polyvinyl alcohol (PVOH), a copolymer of polyethylene-vinyl alcohol copolymers, ethylene-vinyl acetate, and cellulose ethers, in one or more layers and/or a metal layer such as aluminum foil, polymer film coated with SiOx(where 0<x<=2), polyvinyl alcohol (PVOH), mixed with silicon dioxide, as further described in US 2006/135676, or metallized polymeric film, which may act as a barrier to gases, which may be low or may not be permeable to water, water vapour, carbon dioxide and oxygen. Examples of suitable oxygen barriers include a copolymer of ethylene-vinyl alcohol (EVOH), grades (PVDC), PAN (polyacrylonitrile), aluminum metallized films, such as polypropylene or polyethylene terephthalate films coated with SiOx(where 0<x<=2), polymers, compounded with inorganic lamellar minerals such as polymers, compounded with CH is Noah.

The term "polysaccharide" includes (without limitation) cellulose, hemicellulose, chitin, chitosan, Garga, pectin, alginate, agar, xanthan gum, starch, amylose, amylopectin, alternan, 'gellan, Mutan, dextran, pullulan, fructan, DIN beans false, carragenan, glycogen, glycosaminoglycans, murein, bacterial capsular polysaccharides and their derivatives. The polysaccharide can be used as it is, or spinning can be used to create or improve the fibrous structure.

Microfibrillar cellulose may be the most frequently selected microfibrillar polysaccharide and therefore described in the present description in more detail. Sources of cellulose to obtain microfibrillar cellulose include the following: (a) wood fibers, for example, produced from solid wood and soft wood, such as chemical pulp, mechanical pulp, thermal pulp, chemical-thermomechanical pulp, regenerated fiber (b) fiber seeds such as cotton seeds; (C) the fiber from the husk of the seed, such as fiber from the husk soybeans husk of peas, the husk of the grain; (d) bast fiber, such as fibers of flax, hemp, jute, ramie, kenaf, (e) fiber leaves, such as leaves Manila hemp, sisal; (f) fiber stalks or straw, such as fibers from bagasse, corn, wheat is; (g) grass fiber, such as fiber from bamboo; (h) cellulose fibre from algae, such as fiber vilonia; (i) bacteria or fungi; and (j) parachilna cells, such as cells from plants and fruits, and, in particular, sugar beet and citrus fruits such as lemons, limes, oranges, grapefruits. Can also be used microcrystalline forms of these cellulosic materials. Sources of cellulose include (1) peeled, optional bleached wood pulp derived sulfite, Kraft (sulfate) or prehydrolysis Kraft ways, and (2) treated cotton tow. The source of cellulose is not limited, and can be used from any source, including synthetic cellulose or similar cellulose. According to one variant microfibrillar polysaccharide, such as microfibrillar cellulose, obtained from solid wood and/or soft wood.

For the purposes of the present invention the polysaccharide microfibrils are substructures of small diameter with a high ratio of length to diameter, which are comparable in size with microfibrillar cellulose, existing in nature. Although the present description refers microfibrillar and microfibrillation, these terms here include (nano)fibers with nanometric dimensions (cellulose the e or other).

According to one variant microfibrillar polysaccharide, for example microfibrillar cellulose, modified, for example, via grafting, crosslinking, chemical oxidation, for example, when using hydrogen peroxide, Fenton reaction and/or Tempo; physical modification, such as adsorption, such as chemical adsorption; and enzymatic modification. To modify microfibrillar cellulose can also be used combined technologies.

Cellulose can be found in nature in several hierarchical levels of organization and orientation. Cellulose fibers contain layered secondary structure of the walls, which are microfibril. Microfibrils contain multiple microfibers, which, in addition, contain cellulose molecule, located in the crystalline and amorphous regions. Cellulosic microfibers have a diameter in the range of from about 5 to about 10 nm for different parts of the plant, and they most often have a diameter in the range of from about 25 to about 35 nm. Microfibers are present in bundles, which run parallel in the amorphous matrix of hemicelluloses (especially xyloglucan), pectic polysaccharides, lignins and hydroxypropanesulfonic glycoproteins (including extension). Microfibers are separated by intervals of approximately 3-4 nm, to the verge busy matrix compounds, listed above. Concrete placement and position of the matrix materials, and how they interact with cellulose microfibrillar, not yet fully known.

According to one variant polysaccharide cleared or settled to such an extent that the final specific surface area (determined by the adsorption of N2at 177 K in accordance with the BET method using a device Micromeritics ASAP 2010) molded microfibrillar polysaccharide is from about 1 to about 100, for example from about 1.5 to about 15, or from about 3 to about 10 m2/, the Viscosity of the resulting aqueous suspension microfibrillar polysaccharide may be from about 200 to about 4000, or from about 500 to about 3000, or from about 800 to about 2500 mPas. Stability, which is determined by the degree of sedimentation of the suspension may be from about 60 to 100%, for example from about 80 to about 100%, where 100% indicates no sedimentation over a period of at least 6 months.

According to one variant microfibrillar polysaccharide has an arithmetic mean fiber length from about 0.05 to about 0.5, for example from about 0.1 to about 0.4, or from about 0.15 to about 0.3 mm According to one variant microfibrillar polysaccharide is introduced into the pulp slurry in the amount of calculation is as deriving from about 0.5 to about 30, for example, from about 1 to about 15, from about 1 to about 10, or from about 2 to 10% wt. in relation to the weight of cellulose fibers.

Praskovina wood fibers, for example cellulose fibers, different from microfibrillar fibers so that the fiber length of wood fibers is typically in the range of from about 0.7 to about 3 mm, the Specific surface area of cellulose fibers is typically from about 0.5 to about 1.5 m2/, Delamination can be performed in a variety of devices suitable for separation of fiber polysaccharides. A necessary condition for the processing of fibers is that the device is capable or regulated in such a way that the fibers are released from the walls of the fibers. This can be done when the abrasion of the fibers to each other, walls or other parts of the device in which the delamination. According to one variant of the delamination is performed by pumping the pump, mixing, heating, steam discharge, cycle obessolivanija-repressive, impact grinding, ultrasound, microwave radiation, grinding, and combinations thereof. In any of the mechanical operations discussed in this description, it is important that energy was summed up enough to get microfibrillar polysaccharide as defined in question is the description.

According to one variant of the aqueous suspension into which microfibrillar polysaccharide contains cellulose fibers from chemical pulp, such as sulphate and sulphite pulp, organosilica pulp; regenerated fibers; and/or mechanical pulp including, for example, refined mechanical pulp (RMP), opressovannyh mechanical pulp (PRMP), pre-treated alkali-peroxide treated chemical mechanical pulp (P-RC APMP), thermomechanical pulp (TSR), chemical thermomechanical pulp (TMCP), high temperature TSR (NT-TSR), RTS-TMP, alkaline-peroxide mechanical pulp (the APMP), alkaline-peroxide thermomechanical pulp (ARTNR), thermopole, ground wood pulp (GW), abrazivostruynoy wood pulp (SGW), opressovannyh ground wood pulp (PGW), superpressure ground wood pulp (PGW-S), thermomelting wood pulp (TGW), termoobrabotannuju wood pulp (TSGW), chemimechanical pulp (CMP), peeled chemimechanical pulp (CRMP), chemithermomechanical pulp (STMR), high temperature STMR (NT-STMR), selfimmolation thermomechanical pulp (SMTMP), secondary STMR (CTMPR), shredded wood STMR (G-CTMP), polychemicals pulp (SC), neutral sulfite polychemicals pulp (NSSC), Sul is fitnow pulp yield (HYS), biomechanical pulp (BRMP), the pulp obtained'ORSO-way, way explosive transformation into the pulp, Bi-Vis-way, way sulfating with dilution water (DWS), a method of sulfating long fibers (SLF), the method of chemical treatment of long fibers (CTLF), CMP-way long fibers (LFCMP) and their modifications and combinations. The pulp can be bleached and unbleached pulp.

Cellulose fibers can be obtained from particles of solid wood, soft wood and/or Nerevarine. Examples of solid wood and soft woods include birch, beech, aspen, such as the European aspen, alder, eucalyptus, maple, acacia, mixed tropical hardwood, pine, such as pine incense, fir, Hemlock, larch, spruce, such as black spruce or Norway spruce, and mixtures thereof. Non-timber plant source material may be obtained, for example, from the straw of grain crops, straw reed Canary grass Canary, cane, flax, hemp, kenaf, jute, ramie, seeds, fibers, sisal, Abak, coir, bamboo, bagasse or combinations thereof.

According to one variant of pulp fiber suspension in water is obtained from particles of solid wood and/or soft wood.

According to one variant of the aqueous suspension into which microfibrillar polysaccharide contains cellulose in the window in the amount of from about 0.01 to about 50, for example, from about 0.1 to about 25 or from about 0.1 to about 10, or from about 1 to about 10% wt.

According to one variant of the obtained layered paper product is a cardboard, paper, or combination of layers of cardboard and paper.

According to one variant, at least one second layer and is connected with a first layer, for example directly or indirectly over essentially the entire surface, facing each other. According to one variant of the laminate may contain, for example, at least three or four layers. The molding layer may be carried out by any conventional technology.

According to one variant of the two layers, each of which has a density of from about 400 to about 1000 kg/m3for example , from about 510 to about 700 kg/m3connect with a first layer on any side with the formation of the outer layers of the specified layered paper product.

According to one variant, the first layer is produced from mechanical pulp, and skins produced from chemical pulp.

According to one variant of the first layer, usually the inner layer of the laminate has a density of from about 150 to about 500 kg/m3such as from about 200 to about 450 kg/m3for example , from about 220 to about 450 kg/m3such as from primerno to about 400 kg/m 3.

According to one variant, at least one outer layer is produced from chemical pulp obtained in accordance with any of the methods discussed in the present description, or other traditional methods of production of chemical pulp. The pulp can be bleached and unbleached.

According to one variant of the layered paper product such as cardboard, such as cardboard for packaging liquid may contain at least three layers, so the product is obtained in connection directly or indirectly inner layer, molded from a water suspension containing microfibrillar polysaccharide, and other layers connected with relevant parties specified inner layer, and other layers are obtained from aqueous suspensions with or without microfibrillar polysaccharide.

Other layers such as barrier layers, can be molded and connected with outer layers, as defined. Any of the layers can also be coated to improve, for example, resistance titilayo region and the ability of the laminate to the print. According to one variant of any covered or uncovered layer can be, in turn, covered with a layer of plastic, or polymer. Such coating can further reduce the permeability of the fluid and improve termosvarivaemaya product.

According to one variant, at least one layer has a density of from about 400 to about 1000 kg/m 3for example , from about 500 to about 1000 kg/m3for example , from about 510 to about 1000 kg/m3such as from about 510 to about 700 kg/m3such as from about 590 to about 670 kg/m3.

According to one variant, the first layer is produced from mechanical and/or chemical pulp obtained from wood or non-wood pulp in accordance with any of the methods discussed in the present description, or other traditional methods of obtaining pulp. According to one variant, the first layer is obtained from at least about 40 wt.%, for example, at least about 50 wt.%, for example, at least about 60% wt. or, at least 75% wt. mechanical pulp in relation to the total weight of the pulp. The pulp can be bleached and unbleached.

According to one variant, the density of the laminate is in the range from about 150 to about 800 kg/m3such as from about 150 to about 700 kg/m3or from about 200 to about 640 kg/m3or from about 250 to about 600 kg/m3such as from about 300 to about 580 kg/m3or from about 400 to about 500 kg/m3.

According to one variant of the laminate receive so that the unit weight of the laminate obtained in the range of from about 80 to about 1500 g/m2, for example from about 150 to about 1000 g/m2/sup> or from about 200 to about 700 g/m2.

According to one variant of the aqueous suspension also contains mineral fillers of conventional types, such as, for example, kaolin, clay, titanium dioxide, gypsum, talc and both natural and synthetic calcium carbonates, such as chalk, crushed marble, ground calcium carbonate and precipitated calcium carbonate. The aqueous suspension may also contain additives in paper manufacturing traditional types, such as drainage and retention of a chemical hardening agents in wet and dry condition, a sizing agent, such as agents based on rosin, ketene dimer, multimer of ketene, alkenylamine anhydrides, etc.

According to one variant hardening agents in the wet and the dry state can be entered in the quantity of from about 0.5 to about 30 kg/t of pulp. According to one variant of the sizing agent (substance) may be entered in the quantity of from about 0.5 to about 10, such as from about 0.5 to about 4 kg/t pulp. Other paper chemicals can be introduced into the aqueous suspension in the usual manner and in conventional amounts.

According to one variant of the invention is used on paper machines producing drevesinovedeniya paper or cardboard and/or paper or cardboard on cos the ve regenerated fibers, different types of book and newsprint, and/or machines producing printing and writing paper not containing wood.

The present invention also relates to a laminated paper product obtained is considered in this way. The invention, furthermore, relates to a laminated paper product having improved properties from the point of view of at least one of the following options: resistance titilayo edge for hydrogen peroxide, the compressive strength, measured according to a quick test on compression (SCT), a measure of resistance to bending, rigidity index and Z-strength. Layered paper product may contain any number of layers, as discussed in the options section of the way, and may have any of the properties, including density, mass per unit of output, etc. as received under way here above.

In particular, the present invention relates to a laminated paper product containing at least two layers, with the specified layered paper product has:

a) the density of the laminate in the range of from about 150 to about 800 kg/m3,

b) the value of the test faylene edge (EWT) for hydrogen peroxide below 6 kg/m2,

C) an indicator of short-term test in compression (SCT) from 20 to 50 Nm/year

The present invention relates to laminated paper PR is the product, containing at least two layers, with the specified layered paper product has:

a) the density of the laminate in the range of from about 150 to about 800 kg/m3,

b) measure the resistance to bending in the range of from 20 to about 120 Nm6/kg3,

C) an indicator of short-term test in compression (SCT) from 20 to 50 Nm/year

According to one variant, at least one of the layers of the laminate contains microfibrillar polysaccharide in an amount of from about 0.05 to about 50 wt.%, such as from about 0.5 to about 30, or from about 1 to about 15, such as from about 1 to about 10, or from about 2 to about 10% wt. in relation to the weight of cellulose fibers.

However, several layers of the laminate may contain a certain amount, provided that the total number microfibrillar polysaccharide in layered paper product does not exceed 50% wt. in relation to the mass of cellulose fibers in the layered paper product.

According to one variant, the value of the test faylene edge (EWT) for hydrogen peroxide is below 6 kg/m2such as below 5 or 4.5 or below 4 kg/m2. According to one variant, the value of the test faylene edge (EWT) for hydrogen peroxide is below 2.5 or 2.2 kg/m2such as below 2, for example less than 1.5 or 1 kg/m2. According to one variant of the EIT is giving EWT (hydrogen peroxide) is at least 0.1 kg/m2for example, at least 0.2 kg/m2.

According to one variant of the layered paper product has a measure of resistance to bending in the range of from about 10 to about 120 Nm6/kg3for example , from about 14 to about 40, for example from about 17 to about 40, such as from about 20 to about 40, or from about 20 to about 25, for example from 21 to 24 Nm6/kg3.

According to one variant of the Z-strength of the laminate is in the range from about 150 to about 500 kPa, for example from about 175 to about 450, such as from about 185 to about 400, or from about 190 to about 350, or from about 200 to about 320 kPa.

According to one variant of the indicator of the stiffness of the laminate is from about 5 to about 20 kNm/g, for example from about 5 to about 15 kNm/g or from about 5 to about 10 kNm/year

According to one variant of the measure of the strength of the laminate is from about 20 to about 100 Nm/g, such as from about 30 to about 70 Nm/g or from about 40 to about 60 Nm/year

According to one variant, the compressive strength of the laminate according to the index of short-term test in compression (SCT) is in the range from about 20 to about 50 Nm/g, such as from about 20 to about 40, for example from about 20 to about 30, or from about 20.4 to about 25 Nm/is.

According to one variant of the Scott connection is in the range from about 50 to about 500 j/m2for example , from about 100 to about 250, such as from about 130 to about 220 j/m2.

Layered paper product may contain other layers, including plastic or polymer layers deposited on the paper or cardboard layer and/or barrier layers, as discussed in this specification.

In particular, the present invention relates to the use of laminated paper products for use as packaging Board, in particular for use as containers for storing water, oily and/or dry food (as defined in the FDA 176.170 and 176.180). Such foods can include rice, bread (dry food), as well as milk, juice, hot liquids, etc. (liquid). Layered paper product can also be used, for example, for packaging cigarettes, tools (spare parts)for pharmaceutical substances, Soaps, etc. are Other examples of applications include the production of paper products, including laminated paper and/or cardboard; wrapping and packaging material for products such as industrial goods, or as an intermediate product for the manufacture of such final products or other laminated paper products. The packaging must protect the contents from others in the conditions, including shock during handling, transportation and storage, compression in storage and extreme temperatures and moisture.

It is obvious that the described thus the invention can vary in many ways. The following examples will additionally show how the described invention can be implemented without limiting its scope.

All parts and percentages are parts and percentages by weight, unless otherwise specified. All quantities microfibrillar polysaccharide and microfibrillar pulp are given in wt.%. in relation to the weight of cellulose fibers.

The following standard methods are used to determine the properties of the laminates, as defined herein, including the following examples:

The standard methodEquipment
The mass per unitISO 536:1995
Paper weight, thicknessISO 534:1998
Mechanical properties (hardness, tensile strength)ISO 1924-2Alwetron TH1(L&W)
Z-strengthSCAN-P-80:98A device for determining the strength of the L&W ZD
The measure of resistance to bending at 15°ISO 2493:1992
The geometric resistance to bendingISO 2493:1992
Scott-linkTappi T 833 pm-94A device for determining the internal Scott-connection
SCT (short test compression)ISO 9895:1998Unit L&W STFI to determine the compressive strength of

Relative resistance to wrinkling get when comparing resistance to bending, measured in MD (machine direction) and CD (cross direction) according to ISO 2493:1992 before and after the formation of wrinkles.

In order to determine the resistance titilayo edge of the laminated paper product, use the test method to mitilene edge, which is carried out according to the following procedure:

Equipment

Water bath, metal boxes, mesh, adhesive tape 3M applicator for applying tape.

Chemicals

35% hydrogen peroxide stored premaxillae a temperature of +8°C.

Experimental part

1. Samples of paper condition at 23°C and 50% relative humidity for at least 2 hours

2. Determine the thickness of the samples according to ISO 534:1988.

3. On the samples using the applicator put sticky tape and cut into 25×75 mm in the range from 5 sample/point.

4. The samples weighed.

5. 5 samples are placed in a metal box, containing 35% hydrogen peroxide.

Metal box before it was placed in a water bath at +70°C (±1.0°C). Specially designed mesh is placed in a box to contain the samples at the bottom of the box. Samples should be 10 cm below the surface of the hydrogen peroxide. After the sample is placed in a box, close the lid and start the timer.

6. After 15 min (±15) samples are removed from the boxes and get wet samples using blotting paper.

7. The samples weighed.

Calculations and records

w1- weight up to (mg)

w2- weight after (mg)

t is the average thickness (μm) for 5 measurements

O - circle = 0.2 m

n - number of samples = 5

Figure faylene edge

Reproducibility

Accurate results can be obtained by the method with particularly high levels of hydrophobicity, including the values of the test on faylene region below 2.0 kg/m2. Below this pre is eating double the sample should not vary by more than ±10% for leaves, obtained in the laboratory, and ± 5% for the sheets received on the machine.

Example 1

A) Receive a paper product in which the top and the back layer have the same composition as industrial cardboard with a weight per unit 60 g/m2from fiber Kraft pulp from a mixture of 60% solid wood (SR 26) and 40% soft wood (SR 23) using dynamic installation forming sheets (Formette Dynamic, supplied by the company Fibertech AB, Sweden). Paper sheets formed on a dynamic installation forming sheets when pumping feedstock consistency pulp: 0,5%, conductivity: 1500 microns/Cm, pH 7) of the mixing box through the movement of the nozzle in a rotating drum on a film of water on top of the wire, the diversion of water from the source of raw material with the molding of the sheet, pressing and drying the sheet. The amount of chemical introduced into the suspension (with respect to the weight of pulp), and time (in seconds) before feeding pump and forming sheet are as follows:

While dehydration is 75 C. Paper sheets are pressed at 3 bar (300 kPa) in a roll press and dried pinned flat in a dryer at 105°C for 8 minutes

C) Top and back layers of cardboard with a weight per unit 56 g/m2and 53 g/m2receive , respectively, as in (A), but with the introduction of microfibrillar CE is lulzy in different amounts, and they have the following characteristics: arithmetic mean fiber length: 0.25 mm (device Kajaani FS-100 Fiber Size Analyzer), specific surface area: 5 m2/g (BET method using the device Micromeritics ASAP 2010); viscosity: 1098 mPas (Brookfield viscometer RV3, 12 rpm); stability: 100% (the degree of sedimentation of 0.5% cellulose suspension); water retention value (wrv ranges): 5,39 (yoy) (SCAN: -C 62:00).

The top and back layers of cardboard, obtained according to a) and b), analyze on their mass per unit of output, tensile strength and stiffness. From table 1 we can see that the breaking strength of cartons received from the source of raw materials, which entered 3-10% microfibrillar cellulose is about the same or higher bursting strength of cartons received from the source of raw materials without introducing microfibrillar pulp, even though the mass per unit of output is 53 and 56 g/m2, i.e. lower than in the first (60 g/m2). A similar observation can be made regarding hardness (see table 1).

Table 1
Weight per unit (g/m2)Microfibrillar cellulose (%)Tensile strength (kN/m)Stiffness (kN/m)
6004,63350
5604,11323
5634,51338
5664,89388
56105,02426
5303,91298
5334,33331
5364,56354
53104,79368

Example 2

A) a Paper product in which the inner layer has the same composition as industrial cardboard, with a mass per unit of output 130 g/m2receive from a mixture STMR-pulp (CSF 400), pulp waste and Kraft pulp of soft wood (SR 23) with locname with different ratios (A1-A4, see table 2) using dynamic installation of the molding sheet (Formette Dynamic, supplied by the company Fibertech AB, Sweden). Paper sheets are moulded as in example 1. The amount of chemical introduced into the suspension (with respect to the weight of the pulp, including pulp waste), and time (in seconds) before the feed pump and forming sheet are the same as in example 1, but with 0.35% of AKD. The sheet is dewatered, pressed and dried as in example 1, but with 11 minutes drying flat in the dryer.

Table 2
SampleSTMR (%)Pulp waste (%)Kraft pulp from softwood (%)
A1602020
A2652015
A3702010
A475205

C) the Inner layer of cardboard having a weight per unit 130 g/m2on ucaut, as in section a), but from a mixture of pulp, consisting of 75% STMR-pulp, 20% pulp waste and 5% Kraft pulp of soft wood, which is injected microfibrillar cellulose in amounts of from 2 to 8% (B1-B4).

C) the Inner layer of cardboard having a weight per unit 130 g/m2get as in section a), but from a mixture of pulp, consisting of 75% NT-CTMR-pulp (CSF 700), 20% pulp waste and 5% Kraft pulp of soft wood, which is injected microfibrillar cellulose in amounts of from 2 to 8% (C1-C4).

The inner layers of cartons received in accordance with sections a-C, analyze their measure of the strength and Z-strength. From table 3 it can be seen that the density of the inner layer of cardboard can be reduced by essentially storing a measure of the strength and Z-strength layer options And the introduction of microfibrillar cellulose in combination with a larger number of STMR, especially NT-STMR, by forming the inner layer.

Table 3
SampleMicrofibrillar cellulose (%)Density (kg/m3)A measure of the strength (Nm/g)Z-strength (kPa)
A10 339of 40.9256
A20335to 38.3248
A3031835,1209
A4027529,6144
B12279of 31.8188
B2428732,9214
B3530137,7254
B4833744,2311
C1226832,0180
C2 428235,0222
C3629137,4250
C4831041,9282

Example 3

A) a Paper product is produced with the same composition as industrial cardboard, with a mass per unit 250 g/m2using dynamic installation of the molding sheet. The upper and lower layers, each 60 g/m2receive from a mixture of pulp with 60% solid wood (SR 26) and 40% fiber Kraft pulp of soft wood (SR 23). The inner layer, 130 g/m2receive from a mixture of 60% STMR-pulp (CSF 400), 20% pulp waste and 20% fiber Kraft pulp of soft wood. Paper sheets formed on a dynamic installing molding sheet as in example 1, however, do not carry out the dehydration of raw materials between the formation of different layers. The amount of chemical introduced into the suspension (with respect to the weight of the pulp, including pulp waste), and time (in seconds) before the feed pump and forming sheet are the same as in examples 1 and 2. Time dehydration three-layer cardboard is 90 C. omanye sheets are pressed at 3 bar (300 kPa) in a roll press and dried pinned flat in a dryer at 105°C for 15 minutes

C) three-layer cardboard, having a total weight per unit 215 g/m2the upper and lower layers, with a mass per unit 53 g/m2and the inner layer having a mass per unit 109 g/m2get as in section a), but with the introduction of microfibrillar cellulose. The number microfibrillar cellulose entered at the top and back layers is 2%, while chemicals paper introduce, as in section a) of example 1. The inner layer is produced from pulp containing 75% NT-CTMR-pulp (CSF 700), 20% pulp waste and 5% fiber Kraft pulp of soft wood, which is injected 3% microfibrillar pulp.

(C) three-layer cardboard, having a total weight per unit 215 g/m2get as in section b), but the inner layer is prepared from a mixture of fibers 80% HT-STR-pulp (CSF 700) and 20% pulp waste, which impose 5% microfibrillar pulp.

Cartons received under sections a-C, analyze on their density, tensile strength, Z-strength and geometric resistance to bending (see table 4).

Table 4
SampleWeight per unit (g/m2)Density (kg/m3)azrina strength (kN/m) Z-strength (kPa)The geometric resistance to bending (Nm)
And25046314,8261447
In21542113,9206433
21539213,3167485

The results presented in table 4 show that the geometric resistance to bending is essentially maintained or improved, while the tensile strength is essentially preserved in samples b and C compared to sample A (comparison), despite the fact that samples b and C have a much lower mass per unit of output and density.

Cartons received in accordance with sections a-C, cover (laminated) and analyze their densities, the rate of resistance to bending, faylene edge (hydrogen peroxide) and relative resistance to the formation of wrinkles in the machine (MD) and transverse (CD) direction. When comparing covered and uncovered the x samples (see table 5) you can see that the lamination of cardboard polyethylene increases the density and, thus, reduces the rate of resistance to bending for all boards. However, it also shows that the increased rate of resistance to bending can be obtained for the boards b and C, obtained by the introduction microfibrillar cellulose in the feedstock compared with cardboard And (comparison). In addition, you can also see a favorable reduction properties relative resistance to wrinkles and faylene region (table 5) laminated cardboard according to the present invention. When faylene edge (b, C) is reduced in comparison with A, the resistance of the liquid at the edges increases.

Table 5
SampleDensity (kg/m3)The measure of resistance to bending (Nm6/kg3)Faylene edge (HP) (kg/m2)Relative resistance to wrinkling (%)
uncoveredcovereduncoveredcoveredMDCD
And51454626,224,77,07878
In45851334,528,43,77274
46151234,728,54,56675

Example 4

A) Layered paper products are obtained from the total mass per unit 150, 200, 250 and 300 g/m2accordingly, using the dynamic installation of the molding sheet (Formette Dynamic, supplied by the company Fibertech AB, Sweden). The upper and lower layers, each 55 g/m2receive from a mixture of pulp with 60% solid wood (SR 26) and 40% fiber Kraft pulp of soft wood (SR 23). Internal layers, 40, 90, 140 and 190 g/m2receive , respectively, of a mixture of pulp from 70% STMR-pulp (CSF 400) and 30% fiber Kraft pulp from soft is raisiny. Paper sheets formed on a dynamic installing molding sheet as in examples 1 and 3, but with the following amounts of chemicals introduced into the suspension (with respect to the weight of pulp), and time (in seconds) before the feed pump and molding sheet:

Time (s)The outer layer (%)The middle layer (%)ProductChemical
15000Microfibrillar cellulose
900,20,5Eka DR 28HFAKD (dimer of alkylbetaine)
300,61,0PB970Cationic potato starch
150,030,03NP442A colloidal solution of silicic acid
0Submission is by ASOs

In order to reach values of about 600 kg/m3the products are pressed into flat press in accordance with the following: a laminate with 150 g/m2- at 8,5 bar (850 kPa) for 5 min, the laminate 200 g/m2- at 10 bar (1000 kPa) for 5 min, the laminate with 250 g/m2- at 13 bar (1300 kPa) for 5 min and the laminate with 300 g/m2- at 13 bar (130 kPa) for 7 minutes

In) Laminated paper products are obtained from the total mass per unit 150, 200, 250 and 300 g/m2accordingly, as in section a), with the inner layers (40, 90, 140 and 190 g/m2), obtained from a mixture of 78% NT-CTMR-pulp (CSF 740) and 22% fiber Kraft pulp of soft wood. The number microfibrillar pulp introduced into the inner layers is 5%, while chemicals for fitline edges are as in section a). Layered paper products is pressed, as in section a).

(C) Laminated paper products are obtained from the total mass per unit 150, 200, 250 and 300 g/m2accordingly, as in section b), but with the inner layers (40, 90, 140 and 190 g/m2), obtained from a mixture of 83% NT-CTMR-pulp (CSF 740) and 17% fiber Kraft pulp of soft wood. The number microfibrillar pulp introduced into the middle layer is 5%, while chemicals for fitline edges are as in section a). Layered paper products will result, as in section a).

Cartons received under sections a-C, analyze on their density, tensile strength, Z-strength and geometric resistance to bending (see table 6).

Table 6
Weight per unit (g/m2)Density (kg/m3)A measure of the strength (Nm/g)Z-strength (kPa)The measure of resistance to bending (Nm6/kg3)
AndInAndInAndInAndIn
15060358256477,677,273,445439235622,0 23,625,4
20059252453469,771,170,647834039723,630,831,0
25059952053167,965,564,847535536421,630,528,9
30058353452364,661,161,041935037021,324,226,4

The results presented in table 6, show that the rate of resistance is Shibu essentially improved, while the tensile strength is essentially preserved in samples b and C compared to sample A, despite the fact that samples b and C have a lower density.

Example 5

A) Layered paper product is produced on a paper machine for the manufacture of multilayer cardboard. Two outer layers get two square dewatering devices, and an inner layer with a second Boxing ahead of a hybrid former. All three head box used in the experiment represent the hydraulic head boxes. The scheme of the section is a pressing roller press with double cloth with a subsequent press of the flat plates with double cloth. After the pressing section of a paper product is rolled and then dried for 3-4 h on a stand-alone four-cylinder dryer.

Outer layers, each 55 g/m2receive from a mixture of the pulp of 60% bleached soft wood (SR 23) and 40% bleached hardwood (SR 25). Before forming sheet in the pulp suspension imposed following chemicals: 0.2% of Eka DR 28HF (AKD, dimer of alkylbetaine), 0,6% Perbond 970 (cationic potato starch), 0.03% of Eka NP 442 (a colloidal solution of silicic acid).

The inner layer consists of 70% STMR (CSF 400) and 30% soft wood. The mass per unit inner layer is approximately 100 g/m2. Lane is on the forming sheet enter the following chemical substances against faylene edge: 0.5% of Eka DR 28HF (AKD, dimer of alkylbetaine), 1,0% Perbond 970 (cationic potato starch), 0.03% of Eka NP 442 (a colloidal solution of silicic acid).

B) Layered paper product is obtained according to section A), but with an inner layer consisting of 70% HT-STMR (CSF 740) and 30% soft wood.

(C) Layered paper product is obtained according to section b), but with the introduction of 2% microfibrillar cellulose inner layer before the introduction of chemicals against faylene region, as defined in section A).

D) Layered paper product is obtained according to section b), but with the introduction of 5% microfibrillar cellulose inner layer before the introduction of chemicals against faylene region, as defined in section A).

E) Layered paper product is obtained according to section D). In aqueous suspension for forming the outer layers impose 2% microfibrillar pulp before the introduction of chemicals against faylene edge. The number of chemicals against faylene region, led in the outer layers is the same as in section a), but with 0.06% Eka NP 442.

Cartons received under sections a-E, analyze on their strength properties and resistance titilayo edge using hydrogen peroxide (see table 7).

Table 7
With eusto paper UnitAndInDE
The mass per unitg/m2205207210217207
Densitykg/m3609530537549575
A measure of the strength ofNm/g52,448,743,850,351,7
The rigidity indexkNm/g5,9the 5.75,65,66,0
The measure of resistance to bendingNm6/kg317,423,8 23,820,420,9
Z-strengthkPa432181223258306
Scott-linkJ/m2244133125177211
Indicator short test compression (SCT)Nm/g23,819,820,420,522,7
The rate of resistance titilayo region (NR)kg/m25,52,52,02,01,9

1. A method of obtaining a laminated paper product containing at least two layers, the method includes:
(i) providing a water suspension containing cellulosic fibers,
(ii) an introduction to the suspension microfibrillar polysaccharide in number with the calculation of the m to receive from about 0.05 to about 50 wt.% in relation to the weight of cellulose fibers,
(iii) dewatering the obtained suspension and forming the first layer, having a density of from about 150 to about 500 kg/m3specified layered paper product.

2. A method of obtaining a laminated paper product containing at least two layers, the method includes:
(i) providing a water suspension containing cellulosic fibers,
(ii) an introduction to the suspension microfibrillar polysaccharide in number with the expectation of obtaining from about 0.05 to about 50 wt.% in relation to the weight of cellulose fibers,
(iii) dewatering the obtained suspension and forming at least the first layer and the second layer of the specified laminate, and at least one of the at least first and second layers is formed from an aqueous suspension containing polysaccharide obtained in stage (ii), and the connection of these layers so that the laminated paper product receives a density of from about 150 to about 800 kg/m3.

3. The method according to claim 1 or 2, where the layered paper product is cardboard.

4. The method according to any one of claims 1 and 2, where microfibrillar polysaccharide is administered in suspension in number with the expectation of obtaining from about 1 to about 15 wt.% in relation to the weight of cellulose fibers.

5. The method according to any one of claims 1 and 2, where the cellulose fibers are obtained from mechanical pool the dust.

6. The method according to any one of claims 1 and 2, where the first layer has a density of from about 220 to about 450 kg/m3.

7. The method according to any one of claims 1 and 2, where microfibrillar the polysaccharide is microfibrillar pulp.

8. The method according to any one of claims 1 and 2, where microfibrillar cellulose is modified by grafting, crosslinking, chemical oxidation, physical and/or enzymatic modification.

9. The method according to any one of claims 1 and 2, where microfibrillar polysaccharide has a specific surface area of from about 1 to about 100 g/m2.

10. The method according to any one of claims 1 and 2, where microfibrillar polysaccharide has an arithmetic mean fiber length from about 0.05 to about 0.5 mm.

11. The method according to any one of claims 1 and 2, containing the compound of the second layer with a first layer, which second layer has a density of from about 400 to about 1000 kg/m3.

12. The method according to any one of claims 1 and 2, containing the compound of the second layer with a first layer, which second layer has a density of from about 510 to about 1000 kg/m3.

13. The method according to claim 2, containing a combination of two layers, having a density of from about 400 to about 1000 kg/m3, with a first layer on any side with the formation of the outer layers of the specified layered paper product.

14. The method according to item 13, where said first layer produces the tons of mechanical pulp, and outer layers produced from chemical pulp.

15. The method according to any one of claims 1 and 2, where microfibrillar cellulose enter this number with the expectation of obtaining from about 1 to about 10 wt.% in relation to the weight of cellulose fibers.

16. The method according to any one of claims 1 and 2, where the layered paper product is a paper Board for packaging liquids.

17. Layered paper product obtained by the method according to any one of claims 1 to 16.

18. Layered paper product containing at least two layers, the specified layered paper product features:
a) the density of the laminate in the range of from about 150 to about 800 kg/m3,
b) the value of the test faylene edges of hydrogen peroxide below 6 kg/m2,
c) short-term test in compression in the range of from 20 to about 50 Nm/year

19. Layered paper product containing at least two layers, the specified layered paper product features:
a) the density of the laminate in the range of from about 150 to about 800 kg/m3,
b) measure the resistance to bending in the range of from 20 to about 120 Nm6/kg3,
C) an indicator of short-term test in compression in the range of from 20 to about 50 Nm/g
and where at least one of the layers contains microfibrillar polysaccharide in an amount of from about 0.05 to about 50 wt.% in relation to the weight of cellulose fibers.

<> 20. Layered paper product according to any one of p and 19, where at least one of the layers contains microfibrillar cellulose in an amount of from about 1 to about 15 wt.% in relation to the weight of cellulose fibers.

21. Layered paper product according to any one of p and 19, where the Z-strength is from about 185 to about 400 kPa.

22. Layered paper product according to any one of p and 19, where the layered paper product further comprises a plastic, polymer or coloradolarry layer.

23. The use of layered paper product according to any one of p-22 for storing water, oily and/or dry food.



 

Same patents:

FIELD: printing industry.

SUBSTANCE: decorative impregnated paper for printing by means of ink-jet printing method is designed for manufacture of decorative laminates which are used as building material during furniture fabrication and for interior finish. This kind of paper includes impregnated paper base and paint receiving layer. Paper base includes resin for impregnation in quantity of 40 to 250 wt %. In relation to the mass of paper base. After drying the paper has sufficient humidity which is at least 3.5% and spreading of more than 0.4%. Also, method for obtaining the above paper and its use are described.

EFFECT: better coating quality.

12 cl, 2 ex

FIELD: textile, paper.

SUBSTANCE: sheet material, a protective sheet and a protected document include at least two layers applied one onto the other. Besides, the first layer contains at least one lengthy section of zero thickness, and the second layer contains at least one groove, at the same time the specified at least one groove in the second layer is arranged opposite to the specified at least one section of zero thickness of the first layer, thus forming a window. Methods relate to manufacturing of sheet material and making a protected sheet. Method to make a sheet material includes the following stages. Making the first layer of paper specified above by filtration of cellulose fibre suspension on the metal cloth of the first cylindrical shape or a forming device. Making the second layer of paper on the metal cloth of the second cylindrical shape with formation of at least one groove in the second layer. Then two layers are combined and dried. Method to make a protective sheet repeats the above-specified method with inclusion of the stage, where at least partially transparent element is fixed in the longitudinal section of zero thickness of the first layer of the sheet material.

EFFECT: expanded assortment of protected materials, improvement of their protective properties with provision of tactile effect.

43 cl, 7 dwg

FIELD: textile, paper.

SUBSTANCE: item is arranged in the form of rectangular sheet, has the first parallel edges in the first direction and the second edges in the second direction, perpendicular to the first direction. Item comprises at least two layers attached together by binder applied in the form of fixing pattern between layers. Fixing pattern is the pattern of fixing of increased size and comprises fixing elements arranged along the first group of irregular wave-like lines of fixing, passing from one parallel edge to the other at the first angle, making from 20° to 70°, to the first direction, and along the second group of irregular wave-like fixing lines passing from one parallel edge to the other at the second angle, making from 110° to 160°, in the first direction. The first and second groups of irregular wave-like fixing lines cross to form a grid. Fixed area of surface makes from 0.6% to 6.0% of item area.

EFFECT: improved softness, elasticity of absorbing capacity, volume of item.

13 cl, 8 dwg

FIELD: textiles, piper.

SUBSTANCE: single-layer and multi-layer materials, manufacturing methods thereof and device for pressing thin paper layers are designed for producing soft absorbent design paper. Single-layer material made from thin paper consists of the first external surface and the second external surface. At that, design of the first surface is obtained during wet forming, and design of the second surface is pressed and imitating, which is obtained during wet forming. Multi-layer material made from thin paper contains at least two layers, including two external layers. Each external layer has the first surface and the second surface. One external layer has the design obtained during wet forming at least on the first surface. The other external layer has pressed design at least on the first surface, imitating design obtained during wet forming on the first surface of one external layer. Both external layers are brought together so that their corresponding first surfaces represent external surfaces of multi-layer material made from thin paper. Manufacturing methods are based on using the above materials and device for pressing thin paper layers. The latter consists of a pressing roller and supporting roller. Pressing roller has embossing design that corresponds to surface texture or negative of surface texture of fabric, woolen cloth, strip or roller used for forming the design on the layer, which is obtained during wet forming.

EFFECT: improving quality of material owing to improving its flexibility, smoothness, saturating capacity and absorption rate as well as reducing material prime cost.

14 cl, 5 dwg

FIELD: packing industry.

SUBSTANCE: invention relates to production of ecologically safe packages and refers to a cigarette pack comprising a closing and opening outer box and an inner packing placed inside the outer box. The inner packing encloses a set of rod-like smoking products and an inner wrapping which covers this set. The inner wrapping comprises the first paper layer forming one inner wrapping surface, the second paper layer forming the other inner wrapping surface and a moisture-proof layer between the first and the second paper layers. The moisture-proof layer contains solid paraffin as a basic component and its thickness is enough to provide for the first and second paper layers to be glued together. Wrapping paper as well as the method and machine for its production are proposed.

EFFECT: increased moisture resistance, flavour keeping and improved biological decomposition.

20 cl, 9 dwg

FIELD: banking system.

SUBSTANCE: invention relates to valuable documents with increase period of circulation, such as bank notes, cheques, passports, identity cards or other similar documents, to paper protected from forcing for use in making of valuable documents and method of making of valuable documents and method of production of force-protected paper and like valuable documents. Valuable documents is made on paper sheet which is provided with local strengthening passing along at least part of one or several edges of paper sheet. Strengthening is made using one or several means chosen from group consisting of fibers, layer of lacquer and strips of film material. Proposed valuable document features increased tear resistance and possibility of longer circulation and by other characteristics it does not differ from known valuable documents.

EFFECT: increase service life of valuable documents.

35 cl, 12 dwg

FIELD: cellulose-paper industry.

SUBSTANCE: device for continuous connection of paper sheets contains means useable to press aforementioned sheets 5,6 on printing cylinder or shaft 4, simultaneously moving sheets to outlet section of device. Aforementioned means for pressing contains shaft or cylinder 2 provided with rigid external surface, supported by elastic surface positioned below it. Method for connecting two sheets of paper 5,6 contains stage of pressing of sheets between pressing shaft or cylinder 2, provided with rigid external surface and elastic surface positioned below it, and printing cylinder or shaft 4, provided with relief and/or recesses across the surface.

EFFECT: increased quality due to prevention of unwanted deformations of surface of connected sheets, simple manufacture, economic efficiency, extensive service life.

2 cl, 23 dwg

FIELD: paper and pulp industry.

SUBSTANCE: method comprises applying glue at least on the first layer by passing the first layer between the counter-pressing cylinder and roller for batching glue, setting the second layer in the region of the first layer and in the contact with the glue applied on the first layer, and gluing the first layer to the second layer between the counter-pressing cylinder and gluing roller. The glue is applied in the zones of projecting bosses provided on the glue batching roller . The density and sizes of the bosses are chosen to provide sufficient amount of glue between two layers. The device comprises counter-pressing roller provided with a number of bosses and engaging the batcher of glue, pressing roller, and gluing roller.

EFFECT: enhanced adhesion.

40 cl, 8 dwg

FIELD: pulp-and-paper industry, in particular production of multilayered cellulose product preferably paper or paperboard.

SUBSTANCE: claimed method includes filler application between at least two layers of moving fibrous material before bonding thereof with one another. In preferable embodiment inorganic filler is used optionally containing organic components. In the most preferable embodiment calcium sulfate is used.

EFFECT: paper with better optical characteristic such as whiteness and opacity without losses of mechanical properties.

42 cl, 7 dwg

FIELD: paper-and-pulp industry.

SUBSTANCE: when ground paper is manufactured, it is coated with ink-accepting coating. The latter contains latex binder, water-soluble binder, pigment mixture of amorphous silica with colloidal cationic silica and colloidal alumina, and ink-fixing agent. Coating operation is performed in two steps, weight ratio of coating applied in the first step to that in the second step ranging from 0.34:1 to 0.66:1. Reverse face of base paper is coated by detwisting coating. Further, coating is ennobled via superglazing at pressure in supercalender roll gap 30-75 bar.

EFFECT: improved workability of process and improved quality of paper due to increased surface strength.

4 cl, 7 ex

FIELD: printing industry.

SUBSTANCE: decorative impregnated paper for printing by means of ink-jet printing method is designed for manufacture of decorative laminates which are used as building material during furniture fabrication and for interior finish. This kind of paper includes impregnated paper base and paint receiving layer. Paper base includes resin for impregnation in quantity of 40 to 250 wt %. In relation to the mass of paper base. After drying the paper has sufficient humidity which is at least 3.5% and spreading of more than 0.4%. Also, method for obtaining the above paper and its use are described.

EFFECT: better coating quality.

12 cl, 2 ex

FIELD: textile, paper.

SUBSTANCE: paper base is designed to form a decorative material of a coating. It represents a non-processed paper containing a white pigment and/or fillers and is coated with a covering solution, containing at least one water-soluble modified starch with special distribution of molecules according to molecular weight. Also a decorative paper or decorative material is proposed to form coatings with application of the above-specified paper-base.

EFFECT: improved quality of a finished product due to increased inner strength of fixation with high non-transparency and other mechanical properties, improved stability of paper size stability and increased average size of its pores.

7 cl, 2 tbl, 6 ex

FIELD: construction.

SUBSTANCE: paper surface is treated with glue, including water, a latex binder and a mineral filler with the specified ratio of components. The latex binder is selected from the group, including ethylene polyvinyl acetate, polyvinyl acetate latex, styrene butadiene rubber, acrylic and vinyl acrylic rubber. A sheet material is also proposed to line a gypsum wall board, as well as the method to produce treated paper and glue for surface treatment.

EFFECT: higher strength of a wall board by using a smaller ratio of water-gypsum, its improved characteristics with provision of lower energy consumption.

46 cl, 2 tbl, 4 ex

FIELD: printing industry.

SUBSTANCE: decorative paper contains a paper base and an ink-absorbent layer. At the same time the ink-absorbent layer is dyed so that the decorative paper after soaking with impregnating resins and pressing as laminate has the same dye, as well as dyeing of laminate from decorative paper, which does not include the ink-absorbent layer. The latter contains a dyeing pigment and/or colorant in the amount rated for a weight of a dry absorbent ink and makes from 45 to 75%.

EFFECT: reduced quantity of a filler and a pigment in the paper base without deterioration of coverage of the proposed decorative paper.

8 cl, 3 tbl, 9 ex

FIELD: construction.

SUBSTANCE: ground contains cation water-fast additive, alkaline glueing agent and anion activator in specified amount. Anion activator it contains is a component selected from group, including polyacrylate, sulfonate, carboxymethylcellulose and galactomannan hemicellulose. Ground paper has pH from approximately 7.0 to approximately 10, and strength of internal link from approximately 25 to approximately 350 millifeet per pound per square inch. This ground paper is produced by contact of a certain amount of cellulose fibres with water-fast additive, alkaline gluing agent and anion activator, serially and/or simultaneously.

EFFECT: improved physical properties of ground paper and expanded assortment of paper tapes to cover joints.

22 cl, 1 dwg, 1 ex

Wear-proof coating // 2407840

FIELD: chemistry.

SUBSTANCE: coating is a matrix material into which a mixture of high-strength particles having an irregular shape and spherical solid particles essentially without cutting edges are added. The high-strength particles have Mohs hardness of at least 6, and the solid particles have Mohs hardness of at least 3, where the average diametre of the solid particles is equal to or less than the average diametre of the high-strength particles. The matrix material is a synthetic resin based on melamine, acrylate, epoxide, polyurethane, polyamide, polyester, polyimide, caoutchouc, rubber or mixtures thereof. Said wear-proof coating can be used to make wear-resistant surfaces on wooden materials, decorative paper or wood-fibre boards having a decorative print, in making parquet floors, laminated floors, furniture surfaces and working surfaces, as well as for making wear-resistant surfaces of layers on substrates made from metal, glass, ceramic, plastic, concrete or other materials.

EFFECT: high wear resistance of the wear-proof coating without increasing wearing of the press plate or belt press.

16 cl, 2 dwg, 6 tbl

FIELD: textiles, paper.

SUBSTANCE: wear proof particles are treated with adhesion promoter based on silane or sylon and then deposited on paper, impregnated with resin, thereby obtaining coating. Fibre is electrically charged and put onto the coating. Drying is then carried out. The device for implementing the given method has a equipment for depositing wear proof particles on paper, equipment for charging fibre and putting the charged fibre onto the paper. The latter consists of a roller with depressions, made with provision for rotating, and a brush mounted near the roller for cleaning the depressions. The device also has apparatus for electrically charging the roller and/or the brush and the roller, which is made with provision for rotation and passing paper sheets under the roller with depressions. Paper, made using this technique, has a wear proof coating and electrically charged fibres on the wear proof coating. The charged fibres used can be made from polyester and/or cotton, and/or cotton linter.

EFFECT: obtaining wear proof paper with improved properties.

14 cl, 3 dwg

FIELD: technological processes; chemistry.

SUBSTANCE: invention can be used to manufacture attrition-resistant paper in production of laminated panels for floor covering. The paper is impregated by resin and contains attrition-resistant particles, consisting of silicium carbide, aluminium and/or corundum oxide. The particles are covered by silaned adhesion activating agent and are built into the resin matrix. The method of paper manufacturing includes impregnating the paper with resin, spreading attrition-resistant particles along, coated by adhesion activatin agent, along the paper, and then curing the resing by pressurising the paper with other impregnated paper, or with fibers and resin along with heating. The device used to spread the particles along the paper includes rotating shaft with recesses and the brush, located near the shaft, and installed so that to sweep the particles out of the recesses, as well as device to move the paperalong under the shaft. Laminated panel consists of ornamental paper, coated by attrition-resistant layer, applied to base plate, made from wood.

EFFECT: increase of paper attrition resistance and simplificaiton of manufacturing method.

11 cl, 3 dwg

The invention relates to a method for impregnating decorative paper, intended for the manufacture of highly wear-resistant laminated flooring materials, in which the decorative paper is first moistened and thereby impregnate amenomori, and thus regulate the content of the resin

FIELD: textile, paper.

SUBSTANCE: according to one version, method includes provision of aqueous suspension that contains cellulose fibres. Addition of cation polysaccharide and polymer P2, which is an anion polymer, to produced suspension after all points of high polymer P1 shearing force, and P1 polymer is an anion polymer. Then water is removed from produced suspension to form paper. According to the other version, auxiliary agents are added for drainage and retention to produced suspension of cellulose fibres after all points of high shearing force. The latter are represented by a cation polysaccharide and polymer P2, being an anion polymer.

EFFECT: improved drainage without deterioration in retention and forming of paper, increased speed of paper-making machine and application of lower doses of polymer.

34 cl, 5 tbl, 5 ex

Up!