Paper-making and production of cellulose (D21)

D   Textiles; paper(37391)
D21            Paper-making; production of cellulose(8035)

ethod of increasing advantages of reinforcing materials for producing paper and cardboard // 2614272
FIELD: textile and paper.SUBSTANCE: invention relates to a method of producing paper, cardboard or thin cardboard. Method involves the following steps: (a) conversion of a water cellulose material containing starch into a paper mass, (b) prevention of microbial degradation of at least part of the starch in processing the water cellulose material containing starch by one or more biocides, and (c) introduction of a dry and/or wet reinforcing polymer into the cellulose material. Method envisages: (A) determination of properties of water phase of the cellulose material selected from electric conductivity, redox potential, pH value, ATP concentration and free starch concentration, (B) making paper, cardboard or thin cardboard using the said method, (C) determination of the same property (A) after time interval Δt, comparing the value determined at step (B) with the value obtained at step (A) and (D) adjustment of the biocide dosage at step (b) and/or the reinforcing polymer dosage at step (c).EFFECT: invention ensures reduction of electric conductivity of the water cellulose material with higher efficiency of reinforcing polymers due to reduction of their consumption.15 cl, 5 dwg, 7 tbl, 4 ex

Package for eggs and method for manufacturing said package // 2613577
FIELD: packaging industry.SUBSTANCE: present invention relates to a method of producing package for eggs, wherein interacting fasteners in cover part and bottom part of package for eggs are formed by and are located relative to each other so as to compensate for change in shape of cover part, arising during production.EFFECT: invention also relates to package for eggs made using said method.39 cl, 9 dwg
Sustainable adsorbable polymers // 2612709
FIELD: chemistry.SUBSTANCE: invention relates to an aqueous suspension of mineral pigment materials with high content of solid substances, containing dispersing substances and/or dispersants based on renewable sources, as well as methods of preparing such a suspension and to use thereof. Aqueous suspension contains mineral pigment material and at least one modified polysaccharide having carboxylation degree within range of 0.6 to 2.0 and characteristic viscosity in range of 3 to 300 ml/g, where carbon of at least one modified polysaccharide exhibits rate of nuclear transformation of 14C to 14N in range of 400 to 890 transformations per hour per gram of carbon, where at least one modified polysaccharide is present in an amount of 0.05 wt% to 5.0 wt% in relation to total weight of solid substances in suspension, Brookfield viscosity of aqueous suspension ranges from 50 to 1,500 MPa⋅s at 20 °C, and content of solid substances in suspension is more than 50 to 82 wt% in relation to total weight of suspension. Modified polysaccharide is used as a dispersing substance and/or dispersant.EFFECT: aqueous suspension is used in production of paper, plastic, paint, food products, fodder, pharmaceutical products, drinking water and/or in agriculture for reducing effect of sunlight and ultraviolet radiation on plant leaves.20 cl, 15 ex
ethod for treating surface of a banknote // 2611503
FIELD: polygraphy.SUBSTANCE: invention relates to a method for treating surface of a banknote, comprising, on at least one of its opposing faces, at least a printed image, comprised of at least a design. This face and its associated printed image have a transparent protective coating. Coating is applied via printing and dried. Coating contains a varnish and an organic compound, incorporating fluorine atoms in the form of at least a perfluoro-polyether (PFPE) group, on said face.EFFECT: invention provides increased durability of banknotes in terms of mechanical strength and chemical resistance at its regular authentication and higher protection.12 cl, 6 dwg, 2 tbl

High solids and low viscous aqueous slurries of calcium carbonate-comprising materials with improved rheological stability under increased temperature // 2610509
FIELD: chemistry.SUBSTANCE: present invention discloses aqueous slurries with improved rheological stability at temperature higher than 65 °C. Said slurries include calcium carbonate containing material and at least one comb-like polymer. Specific viscosity of comb-like polymer, measured at 20 °C and concentration of 45 g/l, differs from specific viscosity measured at 70 °C by 0.15–0.5. Cloud temperature of comb-like polymer, measured in water, is not in range of 20–95 °C. Specific charge of comb-like polymer at pH 8 from -10 C/g to -600 C/g. Viscosity of aqueous slurry at temperature 20–90 °C is 25–1,000 mPa⋅s.EFFECT: decreased thermal sensitivity of slurry and prevention of increase in viscosity thereof in process of manufacture and use at temperatures exceeding 65 °C.22 cl, 1 dwg, 7 tbl, 6 ex

Device and method of cutting by measuring decorative tape paper and use of device for cutting device // 2610498
FIELD: printing.SUBSTANCE: invention reffers to printing and relates to the device and method of cutting to a size of decorative paper tape, and application the device for cutting the tape. The device for cutting the segments of decorative paper tape, that have the coating, includes a flow line with means for decorating and impregnating endless belt paper for converting a ribbon of decorative paper and at least one device for lateral dissolution separating belt lengths decorative paper of a certain length of tape decorative paper . In the feeding direction, before at least one device for transverse dissolution there is at least one device for slitting to separate the decorative paper tape, at least two endless longitudinal tape decorative paper, and at least one deflecting device, which separates the two longitudinal tape relative to one another and leads, respectively, to a separate device for the cross dissolve.EFFECT: invention provides a process of optimization of cutting pieces of decorative paper tape.15 cl, 5 dwg
Device for production of paper with transparent areas and paper produced using device // 2610397
FIELD: textile; paper.SUBSTANCE: device contains a grid for the printing cylinder or dandy roll of papermaking machines equipped with the filigrees with holes. The said holes have 0.2-0.3 mm diameter. The holes evenly distributed throughout all filigree area with the spacing of 0.2-2.5 mm. There are subgrid components secured on the flipside of the grid symmetrically to the location of filigrees, performed in the form of metal or plastic grids with 0.4-0.95 mm meshes. The paper obtained using the said device is also declared.EFFECT: invention allows producing the paper with transparent areas, which is characterised by high transparency in these areas and their enhanced thickness uniformity.5 cl

ethod of applying composition containing cationic trivalent metal and loosener and sheet of loose cellulose made therefrom // 2610240
FIELD: wood working industry.SUBSTANCE: proposed is a method of making a sheet of loose cellulose involving contacting of at least one cationic trivalent metal, a salt thereof or their combination with a composition containing fibres of loose cellulose and water, at the first pH value to form a mixture of loose cellulose; forming a fabric from this mixture of loose cellulose, application of at least one loosening surfactant onto the fabric and raising the pH value to the second pH value, which is greater than the first pH value, for making a sheet of loose cellulose. Also proposed is a sheet of loose cellulose including the fabric containing fibres of loose cellulose, at least one cationic trivalent metal, its salt or their combination, at least one loosening surfactant and having the energy of separation into fibres of <145 kJ/kg. Also proposed are products and applications of the sheet of loose cellulose.EFFECT: proposed is a method of making a sheet of loose cellulose.1 cl
Organopolysilicone polyether drainage aid // 2609260
FIELD: pulp and paper industry.SUBSTANCE: invention relates to means for dehydration of cellulose. Disclosed is a composition of dehydration means, containing polyorganosiloxanes functionalised with side polyethers and/or aliphatic hydrocarbons, having presented structures. Also disclosed is a method of producing said composition and method for increasing dehydration rate and filtering in procedures for washing and disinfection of cellulose.EFFECT: use of disclosed composition for dehydration significantly speeds up dehydration and improves filtration of fibrous mass when processing cellulose.18 cl, 1 tbl, 8 ex

Preventing of starch degradation in production of cellulose, paper or cardboard // 2609245
FIELD: technological processes.SUBSTANCE: invention relates to process waters treatment. Method of starch degradation degree controlling in starch containing process water from cellulose production provides for process water treatment with biocidal system containing zinc ions and oxidizing or non-oxidizing biocide.EFFECT: disclosed method provides effective reduction or prevention of starch degradation with high quality of production.13 cl, 4 dwg, 4 tbl, 4 ex
Softwood craft fibre with improved whiteness and brightness and methods of its production and use // 2608686
FIELD: pulp and paper industry.SUBSTANCE: disclosed is bleached craft fiber from conifer species wood cellulose with high content of alpha-cellulose and higher brightness and whiteness.EFFECT: invention also describes methods for production of craft fibres and products manufactured from it.19 cl, 12 tbl, 7 ex

Belt-creped multilayer sheet with variable local basic weight with cellulose microfibre obtained by means of perforated polymer tape // 2608601
FIELD: pulp and paper industry.SUBSTANCE: invention relates to multilayer absorbing sheet, containing cellulose fibre, suitable for paper towels and napkins. Product in form of multilayer napkin or multilayer towel comprises at least one web obtained by wet laying, produced by belt creping method, wherein at least one web obtained by wet laying contains from 20 to 60 WT% of fibrillated regenerated cellulose microfibres and from 40 to 80 WT% of paper forming fibres originating from wood pulp, wherein said, at least, one web obtained by wet laying has following formed in it: (i) plurality of enriched with fibres hollow dome-shaped areas, projecting from upper side of, at least, one web obtained by wet laying, wherein hollow dome-shaped areas have side wall, formed along, at least, their front edge, wherein side wall has local basic weight, which exceeds average basic weight of, at least, one web obtained by wet laying; (ii) connecting network forming areas, connecting hollow dome-shaped areas of, at least, one web obtained by wet laying, wherein connecting areas have local basic weight, which is much lower, than hollow dome-shaped areas local basic weight; and (iii) transition areas with consolidated fibrous areas, which transfer from connecting areas to hollow dome-shaped areas, extending upward and inside from connecting areas to hollow dome-shaped areas side walls. Multilayer absorbing sheet comprises, at least, first and second layers, connected together. In one design provided are first and second layers with originating from pulp paper forming fibres and fibrillated regenerated cellulose microfibres, having CSF value of less than 175 ml; wherein sheet has thickness of 180–250 mil/8 sheets and shows wiping dry time of less than 20 s, SAT capacity in range of 350–500 g/m2, SAT rate in range of 0.05–0.25 g/s0.5, wet elongation CD in range of 400–2,500 g/3" and CD-tensile strength ratio in wet state/in dry state from 35 to 60 %. Multilayer sheets have sufficient absorbing capacity for use as conventional paper towels.EFFECT: preferred products have differential pores volume for pores with diameter of less than 5 mqm, making, at least, 75 mm3/g/mqm.76 cl, 42 dwg, 12 tbl

Printing material // 2608415
FIELD: polygraphy.SUBSTANCE: invention relates to material for flexographic printing and method of its production. Material for flexographic printing includes a substrate, having front and reverse sides. Substrate includes on at least on front side at least one permeable cover layer, containing calcium carbonate particles. Said particles in form of compacted material have monomodal pore diameter distribution, determined by volume polydispersity from 40 to 80 nm and median pore diameter from 30 to 80 nm.EFFECT: invention provides increased amount of absorbed ink and improved lustre and brightness of imprints at high speed of absorption of portable ink and high efficiency of flexographic printing.30 cl, 11 dwg, 10 tbl, 4 ex
Security feature having several components // 2607816
FIELD: printing.SUBSTANCE: invention relates to a security feature having a luminescent component and a component camouflaging luminescent component for valuable documents. Security feature comprises at least one luminophore consisting of a doped host lattice, and a component camouflaging luminescent component. Properties of luminescent component, its element structure of host lattice, dopants are masked by camouflaged by camouflaging component in at least two significant properties of luminescent component. X-ray diffraction patterns of luminescent component and camouflaging component are characterised by partial superposition on each other in significant peaks. Superposition of peaks is at least 20 % of height of main peak.EFFECT: invention provides difficult or prevention of identification of luminescent component.18 cl, 9 ex

Protective thread // 2607811
FIELD: safety.SUBSTANCE: invention relates to protective thread intended for embedding into protected document. Thread has at least two zones located on each side of separation line, passing in longitudinal direction along thread, first optically variable protective element in first zone and second optically variable protective element in second zone. First and second elements are distant from separation line. For first observation direction two elements have appearance different to each other. For second observation direction said two elements, first, have appearance, changed compared to their appearance when viewed in first observation direction, and, second, have appearance different to each other.EFFECT: enabling easier thread making process.33 cl, 31 dwg

Device for plate of disperser and method of grinding paper // 2607753
FIELD: machine building.SUBSTANCE: subassembly opposite discs or cones for disperser, wherein each disc or cone has plate or set of segments of plate with front surface on each plate or group of segments of plate, and each surface has sequence of knives, grooves and webs. Knives are arranged in rows, rows are separated by annular webs with substantially fixed radial location, and grooves are located adjacent to blades in rows so that grooves form path in form of serpentine extending radially between opposite plates or set of segments of plate on opposite discs or cones.EFFECT: opposite plate or plate segments group are located so that annular connection strap on one plate or group of segments of plate face approximately towards middle row of blades on opposite plate or group of segments of plate.20 cl, 6 dwg
Prepreg // 2607582
FIELD: materials.SUBSTANCE: invention relates to impregnated materials, such as prepregs and decorative impregnated materials or decorative coating materials. Prepreg, used for producing decorative paper or decorative coating material, is produced by impregnating decorative paper-base with a solution of an impregnating resin. Solution of impregnating resin contains at least one styrene-alkylacrylate-hydroxyethyl methacrylate copolymer, wherein alkyl denotes methyl, ethyl, propyl or butyl, and at least one water-soluble polymer, selected from starch or dextrin from starch.EFFECT: prepreg is characterised by improved resistance to separation, as well as better adhesion and flatness.10 cl, 1 tbl, 9 ex
ethod of treating surface of particles of inorganic pigment and method for production of plastics, coatings and laminates using said obtained inorganic pigment // 2607402
FIELD: construction.SUBSTANCE: invention can be used in production of plastics, coatings or laminates. Method of treating surface of particles of an inorganic pigment involves obtaining an aqueous suspension of particles of an inorganic pigment. In a separate container inorganic compounds are precipitated from an aqueous solution by mixing at least two components in aqueous solution and with proper control of value of pH and/or temperature. Suspension of precipitation product is formed, which is then added to aqueous suspension of particles of inorganic pigment. Precipitation product consists of agglomerates of fine primary particles and/or separate crystals. Precipitated inorganic compounds are oxide or sulphate, for example an oxide of silicon, aluminium, zirconium or titanium or mixtures thereof.EFFECT: invention increases covering capacity of inorganic pigments, their resistance to ageing, opacity, brightness and reducing power.11 cl, 5 dwg, 1 tbl, 2 ex
ethod of cellulose producing for ethers and esters // 2607172
FIELD: pulp and paper industry.SUBSTANCE: invention relates to production of cellulose for cellulose ethers and esters and can be used in pulp and paper industry. Method involves cellulose-containing raw material acid cooking in boiling device with bisulfite solution on sodium base in presence of deresinator and boiling product hot refinement with sodium hydroxide in presence of additive. Boiling product hot refinement is carried out in stages, hot refining first stage is performed in presence of complexing agent in amount of 0.1–0.2 % in terms of absolutely dry fiber mass, second stage is performed with separation of spent solution, which is supplied to refining first stage in amount of 20–30 % of total sodium hydroxide consumption at first stage, and boiling product hydrothermal processing is performed between first and second refining stages at temperature of 60–70°C for 50–60 minutes.EFFECT: as a result obtained cellulose has following properties: high content of alpha-cellulose, higher viscosity and low content of lignin.4 cl, 1 tbl, 4 ex
Chemical compounds // 2607082
FIELD: chemistry.SUBSTANCE: invention relates to compounds of formula (I) and formula (II), where R1 and R2, independently from each other, are selected from aliphatic hydrocarbons, containing from 1 carbon atom to 30 carbon atoms, provided that at least one of R1 and R2 is selected from aliphatic hydrocarbons containing at least 8 carbon atoms, and A is a halogen as a hydrophobicity-providing agent, such as adhesive for making paper.EFFECT: invention discloses chemical compounds.9 cl, 2 tbl, 6 ex
ethod of producing cellulose pulp // 2606867
FIELD: technological processes.SUBSTANCE: method of defibring lignocellulose-bearing raw material with a polysulphide-bearing cooking liquor in a boiler for continuous cooking. According to this invention, the cooking liquor is mixed into the raw material which is to be defibred before the cooking, and the cooking liquor is allowed to absorb into the raw material at a temperature which is at maximum approximately 130 °C. After that, cooking liquor used in the absorption is separated from the treated raw material, separated cooking liquor is heated to a temperature of approximately 140–170 °C, after which, the generated hot cooking liquor is mixed back into the treated raw material, possibly together with a fresh feed of cooking liquor, and raw material is defibred with a hot cooking liquor in the boiler for continuous cooking in order to produce cellulose pulp which has a desired kappa number. Thus, in the cooking stage, alkaline cooking liquor which originally was dosed into the absorption solution is used, but the temperature of which has been increased; absorption liquor is not removed, and fresh liquor is not fed into the boiler for continuous cooking or, it is fed, but only in a small amount.EFFECT: disclosed is a method of defibring raw material.18 cl, 2 dwg, 1 ex
Pellet comprising aramid pulp and filler material // 2606438
FIELD: manufacturing technology.SUBSTANCE: invention relates to a pellet consisting of aramid pulp, filler material and moisture, wherein pellet contains not more than 90 wt% aramid pulp, at least 10 wt% filler material and less than 10 wt% moisture and in which amount of moisture, amount of aramid pulp and amount of filler material is 100 % by weight of pellet.EFFECT: invention also relates to a method for production of such pellet.14 cl
anufacture and use of composite structure containing precipitated carbonate // 2606433
FIELD: chemistry.SUBSTANCE: invention relates to a composite structure and a method of producing a composite structure having a polysaccharide body on which is a carbonate is deposited, characterised by that it comprises preparing a solution of carbonate ions; mixing polysaccharide in a form, having free hydroxyl groups on its surface, with solution of carbonate ions to produce carbonate-polysaccharide suspension; and depositing carbonate salt from suspension onto polysaccharide.EFFECT: precipitated carbonate-polysaccharide structure, which, when it is used as filler, improves structural strength of paper or cardboard, gypsum board, plastic or rubber, inter alia, as well as level of rigidity and optical properties (whiteness and opacity) of paper or cardboard together with other fillers or separately from them, in particular with carbonates; furthermore, invention improves hardening of printing ink on surface of paper or cardboard.21 cl, 7 dwg, 7 tbl
ethod of producing acylated vinylamine-containing polymer and use thereof as papermaking additive // 2606227
FIELD: technological processes.SUBSTANCE: invention describes a method for producing acylated vinylamine-containing polymer comprising steps of: a) conducting free radical polymerisation of N-vinylformamide in an aqueous solution; b) conducting alkaline hydrolysis to form vinylamine-containing polymer and c) reacting vinylamine-containing polymer with at least one acylating agent, wherein acylating agent is selected from a group consisting of carboxylic acid anhydride, acyl halide and mixtures thereof, and wherein acylation temperature ranges from about 20 to about 50 °C and wherein carboxylic acid anhydride is not a cyclic anhydride.EFFECT: technical result consists in application of acylated polymer in making paper as additives for increasing strength in dry state, retention and dehydrating agents, as well as agents for inhibiting formation of deposits of resin and adhesive materials.13 cl, 32 ex, 3 tbl

Compositions and methods of making paper products // 2605971
FIELD: textile and paper.SUBSTANCE: invention relates to production of paper. Invention discloses paper strength systems including polyamine-polyamidoamine-epihalohydrin (PPAE) resin. Also disclosed are methods of forming a paper including applying a strength system comprising PPAE to cellulosic fibre, as well as resultant paper.EFFECT: invention provides high tensile strength of paper in dry condition and low permanent strength in wet state.24 cl, 1 dwg, 8 tbl, 30 ex

Rheologically stable aqueous suspensions of mineral material containing organic polymers with low content of volatile organic compounds (voc) // 2605586
FIELD: paper industry.SUBSTANCE: invention can be used in production of paper, plastics, dyes, coatings, concrete, in agriculture and biotechnology. Rheologically stable aqueous suspension of mineral material contains at least one mineral material and at least one polymer of acrylic and/or methacrylic acid taken in the amount of 0.01 to 10 wt% per total weight of the solid substances in tha suspension. Said polymer is obtained by polymerizing a monomer(s) of acrylic and/or methacrylic acid in water using the compound of formula (I) where X is Li, Na, K or H, and R is alkyl chain containing 1-5 carbon atoms. Compound of formula (I) is used in the amount of 0.1-2.5 wt% by weight of the said monomer(s). It has weight-average molecular weight Mw from 800 to 8,000 g/mol, coefficient of polydispersity Ip in the range from 2 to 3. Suspension of mineral material has content of volatile organic compounds (VOC) of ≤ 20 mg/kg.EFFECT: invention enables to obtain a suspension of mineral material containing organic polymers with low content of VOC while preserving rheological stability and without deterioration of optical properties of the paper produced using the said suspension.25 cl, 1 dwg, 4 tbl, 2 ex

Air dispersion of mineral fibres in production of ceiling tiles // 2605210
FIELD: construction; acoustics.SUBSTANCE: invention relates to production of acoustic ceiling tiles based on mineral wool. Method of producing diluted aqueous suspension for water hardening of main mat for acoustic ceiling tiles, includes delivery of a bale of pressed mineral wool with density of at least 8 pounds per cubic foot (approximately 0.13 g/cm3) on section for unpacking bales, disconnection of attachment holding bale in compressed state, mechanical separation of fibres from bale of mineral wool by mechanical means arranged with possibility of dispersion of fibres to ensure overall uniform density of less than 2 pounds per cubic foot (approximately 0.032 g/cm3), until passage of fibres via inlet of tank and direction of separated mineral fibre into mixing tank for bringing into contact with binding agent suspended in water.EFFECT: technical result consists in improvement of acoustic characteristics, high mechanical properties of tiles.4 cl, 3 dwg

System and method of drying base of mat of soundproof tile // 2605181
FIELD: chemistry.SUBSTANCE: invention relates to a method for dehydration of a suspension of fibres and binding substance used in making a base of a mat for soundproofing tiles. Method includes placing suspension on continuously moving screen and vacuum exposure of suspension, applied to lower part of screen, by cyclic modulation of vacuum in a vacuum chamber between a maximum value of vacuum and atmospheric pressure.EFFECT: as a result, abrupt turning on of suction on a relatively large surface area of base of mat is avoided, that otherwise leads to its cracking or caking due to dehydration.5 cl, 2 dwg

Additive for dry sheet of loose cellulose // 2604459
FIELD: textiles, paper.SUBSTANCE: disclosed is method of making sheet loose cellulose, involving formation of cloth containing fibre loose cellulose, and application of at least one aerating surfactant on web to make sheet loose cellulose. Also disclosed is sheet of loose cellulose, including web containing fibre loose cellulose, at least one aerating surfactant and having energy separation into fibres < 145 kJ/kg.EFFECT: invention also discloses products and uses sheet loose cellulose.21 cl, 1 dwg, 1 tbl

Process for treating cellulose and cellulose treated according to process // 2603957
FIELD: chemistry.SUBSTANCE: invention relates to a method of purifying a slurry containing cellulose, such as microfibrillated cellulose, method comprising following steps: providing a slurry comprising cellulose and liquid, subjecting slurry to an electric field inducing liquid of slurry to flow, separating liquid from cellulose thus obtaining a liquid depleted slurry, adding a washing liquid, such as an organic solvent, to liquid depleted slurry, subjecting liquid depleted slurry to an electric field inducing washing liquid of slurry to flow, and separating washing liquid from cellulose, thus obtaining purified cellulose.EFFECT: invention also relates to cellulose, such as microfibrillated cellulose obtained according to said method.15 cl, 4 dwg

Process for treating microfibrillated cellulose and microfibrillated cellulose treated according to process // 2603956
FIELD: chemistry.SUBSTANCE: present invention relates to a process for dewatering of a slurry comprising microfibrillated cellulose wherein process comprises following steps: providing a slurry, comprising microfibrillated cellulose and liquid, subjecting slurry to an electric field inducing liquid of slurry to flow and separating liquid from microfibrillated cellulose.EFFECT: invention also relates to microfibrillated cellulose, dewatered according to present method.13 cl, 4 dwg

Superelastic fabric and method of its manufacturing // 2603560
FIELD: machine building.SUBSTANCE: structure is disclosed for use in industrial fabrics, such as paper machine clothing and industrial fabrics. This structure comprises at least one non-woven extruded film or sheet layer, which is resilient, elastic and compressed in direction of thickness and extensible, flexible and elastic in its longitudinal and transverse directions, and at least one layer from plurality of substantially parallel threads, oriented in machine direction (MD), in different patterns. Structure also contains at least one layer from plurality of substantially parallel threads, oriented in crosswise direction (CD), attached from above or from below of at least one layer from parallel threads oriented in machine direction (MD).EFFECT: such structure has both high degree of compressibility under influence of perpendicularly applied load, and excellent recovery (elasticity or capacity to spring out) after this load removal.63 cl, 13 dwg

Fluorescent whitening agent composition // 2603392
FIELD: chemistry.SUBSTANCE: invention relates to a fluorescent whitening agent composition suitable for optical whitening paper or cardboard. Composition contains specified bis- triazinylamino-stilbene fluorescent whitening agents with carboxylic acid and/or sulphonic acid groups. Composition can be used for whitening paper in pulp, size press or by coating.EFFECT: invention provides high degree of whiteness of paper and stability of aqueous fluorescent whitening agent composition.25 cl, 2 ex

Starch-based self-binding pigment particle suspension // 2603165
FIELD: chemistry.SUBSTANCE: invention can be used in production of plastics, dyes, concrete, in agriculture. Method of producing self-binding pigment particle dye involves preparing an aqueous suspension of a pigment substance and at least one anionic and/or amphoteric starch. Starch is mixed with aqueous suspension of pigment substance. Starch is added to an aqueous suspension of pigment substance in amount of 0.5 to 20 wt% of total weight of dry pigment substance in suspension. Aqueous suspension and starch are combined by grinding so that amount of free starch in obtained suspension is equal to less than 50 wt% of total amount of added starch. Surface charge pigment substance after grinding is neutral or anionic. Grinding step is carried out during and/or after steps of mixing at temperature of 10 °C to 40 °C.EFFECT: invention improves mechanical and optical properties of coatings for paper, containing self-binding particles of pigment dye.27 cl, 19 tbl, 4 ex

"macrostick" control method during processing and production of paper or hygienic paper using secondary processed cellulose // 2602158
FIELD: paper industry.SUBSTANCE: invention is related to paper industry, particularly to techniques for monitoring and control of contaminants (microsticks) and macroscopic contaminants (macrosticks), and a method and device for measuring the efficiency of the additive introduced into aqueous suspension of cellulose mass. Claimed process aims at fast determination of size and content of macrosticks, particles with the diameter over 100 microns, in flows of secondary processed cellulose mass. Said technology is based on the fluorescence analysis of image in order to identify and count viscous elements of sticks, as well as to measure their size.EFFECT: invention ensures higher efficiency of controlling quality of paper mass.8 cl, 8 dwg, 6 tbl

High softness, high durability toilet paper, incorporating high lignin eucalyptus fibre // 2602155
FIELD: textile and paper; hygiene.SUBSTANCE: invention relates to sanitary and hygienic purpose paper. Cellulose sanitary and hygienic purpose paper includes cellulose fibres, selected from a group, consisting of chemically pulped fibres, and mechanically pulped fibres. Cellulose fibres contain about 10 wt% to about 50 wt% eucalyptus fibres with content of lignin of at least about 20 wt%, and about 3 wt% to about 10 wt% of regenerated cellulose microfibres. Invention also discloses a method of producing paper and a paper product.EFFECT: invention enables to replace eucalyptus Kraft fibre in toilet paper.79 cl, 51 dwg, 23 tbl

Suspension of self-binding particles, method of its production and use // 2602119
FIELD: chemistry.SUBSTANCE: invention can be used in production of paper, plastic, paints, coatings, concrete, in agriculture. Method of producing self-binding pigment particles includes providing a suspension containing at least one material containing calcium carbonate, an anionic polymer binding agent and at least one cationic polymer. Said binder contains at least one modified polysaccharide. Suspension and the binding agent are mixed and milled. Binding agent is added in the amount from 0.001 to 20 wt%. Cationic polymer in the amount from 0.001 to 20 wt% is mixed with the suspension and the binding agent and/or mixed with the suspension obtained when milling. Obtained mixture is subjected to deagglomeration cycles.EFFECT: invention allows improving retention of the filler in paper production, producing paper with high content of the filler without disturbing its mechanical and optical properties.24 cl, 21 dwg, 10 tbl, 30 ex

Gluing compositions // 2602061
FIELD: paper industry.SUBSTANCE: invention relates to novel aqueous dispersions of hydrophobic materials used in paper industry as gluing agents. Disclosed is an aqueous composition for gluing paper containing a hydrophobic gluing agent for paper, homogenised with aqueous solution of modified alkyl glycidyl ether of poly(aminoamide), having pH lower than 4.0, and where viscosity is not higher than about 400 cP after 4-week storage at 32 °C. Invention also discloses a method of preparing said composition and method of gluing paper using same.EFFECT: technical result is disclosed aqueous compositions enable to obtain a stable emulsion and enable to achieve efficient gluing of paper products.13 cl, 7 tbl, 11 ex

ethod of leaching heat-recovery boiler ash // 2601925
FIELD: paper.SUBSTANCE: method of cleaning ash of heat-recovery boiler of cellulose plant, used together with single-step or multi-step method of leaching ash, is characterised by that at least one calcium compound, most preferably, calcium oxide (CaO) and/or calcium hydroxide (Ca(OH)2) is used as an additive on one or more leaching stages. Liquid fraction, formed during leaching, is outside main cycle of chemical extraction preferably as a substitute of commercial sodium hydroxide at bleaching line of cellulose plant, and solid fraction may be mixed with stream of black liquor or subjected to additional processing in order to separate a calcium compound for recycling.EFFECT: as a result ash is cleaned from a significant amount of carbonate that it contains.7 cl, 2 dwg

Optically variable protective threads and strips // 2601471
FIELD: safety.SUBSTANCE: invention relates to protection of valuable documents and valuable commercial products from forgery and illegal reproduction and concerns optically variable protective threads and strips. Protective threads or strips contain a substrate and I) first optically variable layer providing the first special colour impression at different angles of vision, II) second optically variable layer providing the second special colour impression at different angles of vision, III) first colour permanent layer, colour of which corresponds to the colour impression from the first optically variable layer or the second optically variable layer at the first angle of vision, IV) second colour permanent layer, colour of which corresponds to the colour impression from the first optically variable layer or the second optically variable layer at the second angle of vision, and v) one or more material-free sections, where the first optically variable layer, second optically variable layer, the first colour permanent layer, second colour permanent layer and one or more material-free sections are visible together on one side of a protective thread or strip.EFFECT: invention provides higher resistance against forgery or illegal reproduction of protected documents containing optically variable threads or strips.25 cl, 25 dwg

ethod for production of paper and cardboard // 2601465
FIELD: paper industry.SUBSTANCE: invention relates to pulp and paper industry. Method comprises introducing fillers, anionic polysaccharides and cationic agents into a mixing zone to form a filler composition. Obtained filler composition is introduced by means of a pump into an aqueous suspension comprising cellulosic fibres and dehydrated.EFFECT: invention improves control of thickness and strength properties of paper and cardboard.25 cl, 1 tbl, 1 ex

Aqueous suspension with high content of solid particles of inorganic substance and/or filler, and/or pigment in medium with acidic ph // 2601330
FIELD: chemistry.SUBSTANCE: invention can be used in chemical industry, in making paper, chalk coating of paper in production of plastic materials, in agriculture and/or in production of paints. Aqueous suspension with high content of solid particles of inorganic substance and/or pigment and/or filler in a medium with acidic pH includes at least one calcium carbonate-containing substance, including calcium carbonate particles, and at least one salt of at least one strong acid. Strong acid is selected from a group consisting of acids, having pKa value less than or equal to zero at +23 °C. Obtained suspension has content of solid substances of at least 50 wt% of total weight of suspension. Brookfield viscosity of suspension at 100 rpm ≤ 1,000 MPa·s at temperature of -5 °C, pH < 6 at +23 °C and electrical conductivity between 10 and 100 mS/cm at -5 °C and +23 °C.EFFECT: invention enables to obtain a suspension with high content of solid particles, which retains physical properties at low temperature and/or in an acidic medium.30 cl, 14 tbl, 14 ex

Composition and method for controlling wettability of surfaces // 2599668
FIELD: chemistry.SUBSTANCE: invention can be used in production of paper, cardboard, wallpaper, plastic, concrete, ceramics. Composition for application on a substrate surface contains particles of echinoid shape consisting of a substance containing calcium carbonate, up to 250 wt% from the weight of the echinoid shape particles of at least one binder and from 0.1 to 10 wt% of the weight of the echinoid shape particles of at least one agent imparting hydrophobicity, and/or at least one agent imparting hydrophilicity.EFFECT: invention allows controlling wettability of surfaces from super-hydrophobicity to extreme hydrophilicity.27 cl, 17 dwg, 11 tbl

Fibrous sheet that disintegrates in water, process for manufacturing said fibrous sheet and core for roll of absorbent material made from strips of said fibrous sheet // 2599367
FIELD: materials.SUBSTANCE: invention relates to a fibrous sheet having a basis weight between 20 g/m2 and 1,000 g/m2 that disintegrates in water, comprising 10 % to 70 % starch on basis of total weight of dry fibrous sheet, wherein starch is uniformly distributed along thickness of fibrous sheet, including outer surface of said sheet, and for which a) disintegration time in water, measured in accordance with NF Q34-020 standard applied to a specimen of sheet of 9 cm × 8 cm, is less than 50 s, preferably less than 35 s, and more particularly less than 15 s, b) residual strength in wet state relative to its strength in dry state is less than 1 % when measuring according to tests at destruction of ring, which includes following operations: (i) securing on ring-shaped support according to ISO 12192:2002 sample, cut in machine direction, having 15 mm width and 152.4 mm length and immediately before measurement immersed in water for period less than 2 s for measurement in wet state; (ii) placing sample between two plates; (iii) exposing sample to compression force at a rate of 10 mm/min; (iv) recording maximum resistance force.EFFECT: new material.21 cl, 2 dwg, 3 tbl

ineral composition for use mainly in fillers paper and coating applied on paper or plastic // 2599296
FIELD: technological processes.SUBSTANCE: invention relates to mineral composition with high adsorption capacity, which can be used as filler or coating agent for various substrates. Mineral composition contains calcium carbonate-based mineral particles. Calcium carbonate particles pressed in the form of a bed, are determined by volume average pore diameter from 0.01 to 0.04 mcm and polydispersity pore size, total specific pore volume of 0.1-0.3 cm3/g and monomodal grain size distribution of pores diameter.EFFECT: proposed mineral composition has controlled pore size and by capillarity, to high adsorption capacity when used on substrates.13 cl, 4 dwg, 6 tbl, 12 ex

Obtaining pigments // 2598449
FIELD: chemistry; textile and paper.SUBSTANCE: invention can be used in paper production, paper coatings, plastics, dyes. Aqueous composition includes material containing calcium carbonate in amount of at least 10 wt% with respect to total dry weight. Composition has Brookfield viscosity lower than 2500 mPa·s at 20 °C. Composition also contains at least one anionic charged comb polymer, having specific charge from -5 to -500 Coulomb/g with pH of 8 and optionally at least one binding agent in an amount of at least 2.5 wt% with respect to total dry weight of composition. Composition also includes at least one salt of divalent or trivalent cation in amount of 1-20 wt% with respect to total dry weight of composition. At that, at least 95 wt% of total amount of said salt is dissolved in composition.EFFECT: invention allows to reduce formation of agglomerated and flocculated particles in an aqueous composition containing calcium carbonate with maintenance of its viscosity, improve mechanical and optical properties of paper products.41 cl, 4 dwg, 2 tbl

Use of precipitated carbonate in manufacture of fibre product // 2598447
FIELD: chemistry.SUBSTANCE: invention can be used in production of paper, cardboard, plastic, rubber, concrete or paints. Method of producing filler containing calcium, sodium or magnesium carbonate involves forming an acidic bicarbonate ion solution from a corresponding hydroxide solution by adding carbon dioxide to solution. Forming of carbonate portion of filler is carried out by increasing pH of obtained acidic bicarbonate ion solution to a neutral or alkaline range by means of pressure below atmospheric pressure or centrifugal force at rotation speed of 50 to 2,000 rpm or a combination thereof.EFFECT: invention increases strength, degree of gloss of paper or cardboard product, optical density of paint layer and opacity due to better fixation of carbonate filler in gaps between fibres of fibrous product.16 cl, 4 dwg, 6 tbl, 4 ex

ethod and apparatus for forming sheet of fluff pulp // 2598284
FIELD: textiles, paper.SUBSTANCE: described are improved methods of making sheets of fluffed cellulose, which are mechanically eliminated many of undesirable links between fibres (bundles of fibres), which can be contained therein to get monotonous flaked cellulose of a single quality. Liquid mass is fed onto moving bottom forming grid to form a web. Liquid mass is brought into contact with moving top forming a grid. Web is subjected to upper and lower dehydration, thus creating separately formed layers in order to reduce communication between fibres. Web may be subjected to high pulsating shifting forces, when it passes along lower forming grid to damage majority of bundles of fibres contained in web. Liquid mixture can be fed to bottom forming net using pressure box with dilution control device to selectively regulate concentration of liquid mass. After web is subjected to action of pulsating shearing forces for dehydration cloth can be used for shoe press. Web may be dried using traditional equipment for drying, such as cylindrical drier.EFFECT: monotonous flaked cellulose of a single quality.26 cl, 8 dwg

In-line drainer with shaped scree slots // 2597915
FIELD: technological processes.SUBSTANCE: invention relates to devices for draining liquid from black liquor slurry stream containing housing and solid fraction. Liquid separator for draining liquid from moving black liquor slurry stream contains cylindrical housing with an inlet located proximally to the first end of the cylindrical housing, a first outlet located proximally to the second end of the cylindrical housing, second outlet located proximally to the first end of the cylindrical housing, as well as internal chamber arranged between inlet and first outlet, wherein the inner chamber extends along the axis of the cylindrical housing. Separator comprises also the screen basket installed in the inner chamber of the cylindrical housing, wherein the screen basket is formed by a plate with side edges which are joined to form a black liquor slurry stream flow chamber, wherein the inlet and first outlet of the cylindrical housing are in fluid communication with the black liquor slurry stream flow chamber; liquid collection chamber formed between an outer surface of the screen basket and an inner surface of the cylindrical housing; second outlet on the cylindrical housing in fluid communication with the liquid collection chamber. Screen basket includes slots extending through the basket to provide liquid flow passages from the black liquor slurry stream flow chamber to the liquid collection chamber. Screen slots each having a length substantially greater than a width of the slot. Width of the slots is selected to retain solid particles of the moving black liquor slurry stream within the black liquor slurry stream flow chamber and block the solid particles from entering the liquid collection chamber. Slots have a length dimension which forms an oblique angle with respect to the axis of the cylindrical housing dimension of between about five degrees to ninety degrees, wherein slots each having a curved corner edge adjacent a surface screen basket facing the black liquor slurry stream flow. Slots are arranged in rows on the screen basket; rows are separated by solid sections of the screen basket, and all slots in each row are uniform in size, orientational positions and forms.EFFECT: technical result is prevention of clogging and facilitation of passage of solid particles through the slot in the screen basket.16 cl, 7 dwg

ethod of bleaching sulphite cellulose // 2597823
FIELD: chemistry.SUBSTANCE: invention relates to production of sulphite cellulose intended for further chemical processing. Obtaining operational properties of sulphite cellulose required for its further chemical processing is achieved due to ensuring such characteristics as α-cellulose content, weight ratio of lignin, dynamic viscosity, weight ratio of resins and fats, ash content, wettability. For the first stage, i.e. delignification, cellulose mass is used with the concentration of 10 %, added with sulphuric acid, sodium molybdate, hydrogen peroxide. These components are added in the following ratio as per absolutely dry cellulose: H2SO4 0.4-1.5 %; Na2MoO4 0.01-0.5 %; H2O2 2.0-5.5 %. Then the produced mixture is heated up to 60-75 °C, delignification is performed at this temperature for 120-130 min. Washing is performed. Second stage of bleaching, i.e. hot alkaline treatment, is performed, for this purpose the cellulose mass after delignification is brought again to the concentration of 10 %,EFFECT: added with sodium hydroxide, which concentration is then brought to 1-2 %, the obtained mixture is heated up to temperature of 100-120°, held at this temperature for 120 minutes, and the obtained cellulose is washed.1 cl, 1 tbl, 6 ex, 1 dwg
 
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