Fluff pulp and core with high sap content
SUBSTANCE: fluff pulp in the form of a core comprises 5-25 wt % of hardwood fibres and one or more superabsorbent polymers (SAP). The fluff pulp has a SAP retention of more than 75 wt %. Fluff pulp is used in an absorbent product, a paper product, a subject of personal hygiene, a medical product, an insulating product, a construction product, a structural material, cement, a food product, a veterinary product, a packaging product, a diaper, a tampon, a sanitary napkin, gauze, bandage, a fire-resistant material, or their combination.
EFFECT: increasing the content of superabsorbent polymers, reducing the thickness and increasing the softness of the core.
14 cl, 6 dwg, 4 tbl, 2 ex
SUBSTANCE: claimed is raw material mixture for obtaining packing material, which contains paper wastes, natural zeolite, starch and water.
EFFECT: invention makes it possible to obtain packing paper, which has good moisture-regulating properties, and reduce cost of its production.
FIELD: textile; paper.
SUBSTANCE: composition contains a fibrous mixture from chemical and thermomechanical mass and cellulose. The fibrous mixture contains birch leached chemical and thermomechanical mass with extent of grinding 60-125 ml (CSF) and cellulose with grinding extent of 350-500 ml (CSF) at the specified ratio of components. The cellulose in the fibrous mixture is a leached pine sulfate cellulose and/or pine sulphite cellulose, or pine cellulose, and/or leaf cellulose.
EFFECT: expansion of leaf-bearing soft woods due to using birch leached chemical and thermomechanical mass to prepare a fibrous semi-finished product to produce paper with high physical mechanical indices to ensure extent of whiteness.
3 cl, 1 tbl
SUBSTANCE: wipe product relates to absorbent paper products. A wipe product represents a wipe sheet having a first side and a second side. The wipe sheet contains cellulose fibres in an amount at least 50 wt %, and an additional composition containing polymer. The additional composition is present at least on the first side of the wipe sheet. The wipe product has extensionality exceeding 3 cm3/g, a fluffiness test value less than approximately 3 mg, and the first side of the wipe sheet has a stick-slip value more than approximately 0.01. The additional composition contains a non-fibrous olefin polymer, ethylene carboxylic acid copolymer or their mixture. The additional composition can be included in a wipe cloth by means of fibre combination to be used for cloth formation. Alternatively, the additional composition can be superficially applied on the formed cloth.
EFFECT: better quality of the wipe product.
20 cl, 42 dwg, 18 tbl, 7 ex
FIELD: textile, paper.
SUBSTANCE: absorbing cellulose web is designed for fabrics or towels and contains cellulose paper-forming fibres and fibrillated regenerated cellulose microfibres at their specified ratio. Fibrillated fibres represent cellulose regenerated from a solution. A dissolvent is an N-oxide of tertiary amine or an ionic liquid. Fibrillation of a microfibre is controlled so that the fibre has lower granularity and reduced beating rate compared to non-fibrillated regenerated cellulose microfibre. Microfibre has CSF-value of beating rate below 100 ml., weighted average diameter is less than 1 micron, weighted average length is below 400 micron, and fibre density is more than 2 billion fibres/gramme. There is also a method proposed to produce an absorbing cellulose web.
EFFECT: simultaneous improvement of softness and CD-extensibility in wet condition at lower module at the specified tensile strength, improved draping, increased absorbing ability.
41 cl, 11 tbl, 89 ex, 35 dwg
FIELD: textile, paper.
SUBSTANCE: method includes dissolution of cellulose and its grinding down to specified extent of grinding. Preparation of the first dispersion with application of return water, containing fibres of microcrystal cellulose, produced by its grinding in mixture with titanium dioxide and calcium hydroxide in specified amount. The second dispersion is prepared from cellulose fibres with application of return water. Then the first suspension is mixed with the second, and produced mixture is treated with carbon dioxide. In case of this treatment calcium hydroxide under action of carbon dioxide results in production of chemically deposited chalk and production of paper mass at specified ratio of components. Grinding of microcrystalline cellulose in mixture with titanium dioxide and calcium hydroxide is carried out in vibration mill with provision of impact and wear effect at mixture.
EFFECT: increased extent of fillers retention in paper, improvement of its printing properties, provision of possibility to vary bulk and porosity of paper, provision of possibility to use fully closed cycle of return water.
1 tbl, 8 ex
FIELD: paper industry.
SUBSTANCE: paper with improved rigidity and bulk and method of its manufacturing may be used in pulp and paper industry and are intended for photocopier equipment. Paper comprises three-layer double-tee structure that forms a single web. It has central core layer manufactured mainly from cellulose, bulk of which is increased with the help of filler, such as hydrazine salt. Starch-based coating is applied on both sides of core layer, at the same time starch has high content of solid products. Coating forms three-layer paper having composite structure with outer layers of high strength that surround core of low density.
EFFECT: improved strength, rigidity and resistance to twisting of produced material.
32 cl, 2 dwg, 3 tbl, 3 ex
FIELD: textile, paper.
SUBSTANCE: method relates to paper or cardboard production and can be used on pulp-and-paper industry. Part of paper pulp fiber is treated with a polymer at least within two stages. Paper pulp treated with the polymer is mixed with remaining non-treated paper pulp. The mixed paper pulp is dehydrated on a net conveyor for forming fibrous web.
EFFECT: increase of strength without negative effect upon paper or cardboard volume with decreasing quantity of adding polymers and enhancing economical efficiency of the process.
14 cl, 4 dwg, 2 ex
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
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
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
SUBSTANCE: claimed invention relates to a method of obtaining heterogeneous mixture used in the paper industry. Described is the method of manufacturing heterogeneous mixture of polymers, including: (a) introduction into a solution of the first portion of a polymerisation initiator and one or several anionic or cationic monomers, with monomers carrying the same charge; (b) introduction into the solution of the second portion of the polymerisation initiator and one or several non-ionic monomers; (c) introduction of the third portion of the polymerisation initiator and one or several ionic monomers, whose charge is opposite to the charge of monomers from (a); (d) gradual introduction of the fourth portion of polymerisation initiator for a reaction of any remaining monomer with formation of a heterogeneous mixture of polymers; and (e) in case of necessity neutralisation of the obtained heterogeneous mixture of polymers, with anionic monomers being selected from the group, consisting of: (1) acrylic acid, (2) methacrylic acid, (3) styrene sulfonic acid, (4) vinyl sulfonic acid, (5) acrylamido methylpropane sulfonic acid and (6) their mixtures; cationic monomers are selected from the group, which includes: (1) diallyldimethylammonium chloride, (2) acryloylethyl trimethylammonium chloride, (3) methacryloylethyltrimethylammonium chloride, (4) acryloylethyltrimethylammonium sulfate, (5) methacryloyl ethyltrimethylammonium sulfate, (6) acrylamidopropyltrimethylammonium chloride, (7) methacrylamidopropyl trimethylammonium chloride, (8) non-quaternised forms (2)-(7), (9) vinylformamide (further hydrolised into vinylamine) and (10) their mixtures, and non-ionic monomers are selected from the group, consisting of: (1) acrylamide, (2) methacrylamide, (3) N-alkylacrylamide, (4) vinylformamide and (5) their mixtures. Also described is the heterogeneous mixture of polymers, intended for increasing the content of a filling agent in paper or carton, obtained by the method described above. Methods of increasing the content of the filling agent in a paper or carton sheet with application of the said heterogeneous mixture of polymers are described.
EFFECT: increase of the content of an inorganic filling agent in paper with simultaneous preservation of weight, strength and suitability of the final product for processing.
17 cl, 9 tbl, 14 ex
FIELD: textile, paper.
SUBSTANCE: method includes provision of a thick mixture of cellulose suspension, which contains a filler. The thick suspension mass is dissolved to form a diluted mix of suspension, in which the filler is available in amount of at least 10 wt % in terms of dry mass of dissolved suspension mix. The thick mixture of suspension and/or dissolved mix are flocculated. Polymer system of retention/dehydration is used in flocculation. The dissolved mixture of suspension is dehydrated on a mesh to form a sheet, and then the sheet is dried. In this method the polymer system of retention/dehydration contains the following: i) a water-soluble branched anion-active polymer and ii) a water-soluble cation-active or amphoteric polymer. The anion-active polymer is available in the thick mixture or in the dissolved mixture of suspension prior to addition of cation-active or amphoteric polymer.
EFFECT: improved retention of ash relative to complete retention with higher quality of paper.
16 cl, 21 dwg, 32 tbl, 8 ex
FIELD: textile, paper.
SUBSTANCE: method includes provision of a thick mixture of suspension, which contains wood mass and a filler. The thick suspension mix is dissolved to form a diluted mix of suspension, in which the filler is available in amount of at least 10 wt % in terms of dry mass of dissolved suspension mix. The thick mix and/or dissolved mix of the suspension are flocculated, using a polymer system of retention/dehydration. The dissolved mixture of suspension is dehydrated on a sieve to form a sheet, and then the sheet is dried. The polymer system of retention/dehydration contains the following: i) a water-soluble branched anion-active polymer and ii) a water-soluble cation-active or amphoteric polymer. The method may be realised on paper-making machines of quick dehydration, such as GAP former.
EFFECT: improved retention of ash with reduction of dehydration.
16 cl, 26 dwg, 46 tbl, 16 ex
SUBSTANCE: water-soluble composition contains a) at least one water-soluble optical bleaching agent, b) a polymer obtained from an ethylenically unsaturated monomer or a monomer mixture, characterised by that at least one monomer is an acrylamide and the water-soluble polymer has average (weight-average) molecular weight between 500 and 49000, optionally c) polyethylene glycol with weight-average molecular weight between 500 and 6000, and d) water. Said composition is used to optically bleach paper.
EFFECT: high degree of bleaching while preserving rheological properties.
7 cl, 7 tbl, 70 ex
SUBSTANCE: invention relates to cation-active or amphoteric polymers used as additives in paper production to improve efficiency of gluing paper products, methods of production and use of additives.
EFFECT: more efficient gluing of paper products, saving material for gluing.
28 cl, 10 tbl, 11 ex
FIELD: paper industry.
SUBSTANCE: methods refer to manufacturing of bleached cellulose material, prevention of yellowing and loss of whiteness in bleached craft-cellulose, and manufacturing of paper goods. In process of bleached cellulose material manufacturing, bleached craft-cellulose is produced and exposed to contact with sufficient amount of more or several reducing agents. Additionally bleached craft-cellulose is exposed to contact with one or several optical bleach, with one or more chelating agent. Method for prevention of yellowing and loss of whiteness of bleached craft-cellulose in storage includes addition of efficient amount of one or more reducing agent into bleached cellulose and possibly one or more chelating agent, one or more polycarboxylate or their combinations. Method for production of paper goods includes production of bleached craft-cellulose, formation of initial water suspension from it, water drainage with formation of sheet and sheet drying. Besides efficient amount of one or more reducing agent is added into bleached craft-cellulose, initial suspension or sheet. Additionally one or more chelating agent is added there, one or more optical bleach, one or more polycarboxylate, or their combination.
EFFECT: improved quality of paper goods, increased stabilisation of whiteness and increased resistance to yellowing in process of paper production and to thermal yellowing, improved colour pattern.
17 cl, 33 tbl
FIELD: textile; paper.
SUBSTANCE: method consists of adding to the paper sheets approximately 0.05 pounds/ton to 15 pounds/ton, in accordance with the dry fibers, one or several polymers, functioning as aldehyde, containing amino or amido group, where, at least, 15 molar percent amino or amido group function with one or several aldehydes and where the functionaling aldehyde polymers have a molecular weight of not less than approximately 100000.
EFFECT: increased activity for drying due to a reduction in the amount of polymer.
14 cl, 5 ex
SUBSTANCE: pre-impregnate is manufactured by impregnation of crude paper with thermosetting formaldehyde-free resin until content thereof 10 to 70%. Residual moisture content in pre-impregnate is 2-3%. Resin contains: at least one radical-polymerization polymer with less than 5% of α,β-ethylenically unsaturated mono- or dicarboxylic acid; at least one radical-polymerization polymer containing more than 5% of α,β-ethylenically unsaturated mono- or dicarboxylic acid; and at least one alkanolamine with at least two hydroxyl groups; or resin contains at least one radical-polymerization polymer with 5-100%, particularly 5-50%, or more particularly 10-40% of α,β-ethylenically unsaturated mono- or dicarboxylic acid and at least one above alkanolamine.
EFFECT: improved quality of surface, printing properties, delamination resistance, and varnishing capacity.
16 cl, 3 dwg, 2 tbl, 2 ex
FIELD: textile, paper.
SUBSTANCE: invention relates to papermaking technology, precisely to production of modified paper with higher gas-proof and heat-protective properties, and can be applied in constructions, aircraft and automobile constructions, shipbuilding. The method includes treatment of paper with the mixture of 5-7% aqueous solution of polyvinyl alcohol with 5-7% aqueous solution of chitosan at their ratio 1:1 within 10-15 minutes, thereafter treatment with 15-20% aqueous solution of methyl phosphate borate and drying.
EFFECT: prepared modified paper has increased gas-proof and heat-protective properties, and resistance to thermal-oxidative degradation.
1 tbl, 6 ex