Paper-making and production of cellulose (D21)
D21 Paper-making; production of cellulose(8035)
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
FIELD: pulp and paper industry.SUBSTANCE: invention relates to the pulp and paper industry and concerns a method of controlling retention on a forming fabric in a papermaking process and an intermediate product, used in the method. For making the intermediate product at least one paper making chemical is added to a suspension, which is a hydrophobic adhesive substance, such as alkyl ketene dimer (AKD) or alkenyl succinic acid andydride (ASA), specific surface area of those fibres being larger than that of the fibres of the main fibrous suspension for paper making, causing the paper making chemical being adsorbed on the fine cellulose fibres. Then this intermediate product is incorporated in the main fibrous suspension before the suspension is supplied from the paper machine head box to the forming fabric.EFFECT: invention provides an improved total retention, as well as an improved control of retention of the chemical agents for making paper separately and/or inter-operatively.17 cl, 2 ex
FIELD: biotechnology.SUBSTANCE: invention relates to a method for increasing the level of glucose produced from lignocellulose biomass, and product made using the said method. Method for increasing the level of glucose produced from lignocellulose biomass involves fabrication of a fractionated biomass, which contains the first solid fraction of cellulose and insoluble lignin; and the first liquid fraction; mixing of the above solid fraction with water for production of a suspension; optional preliminary heating of the said suspension to a temperature below the critical temperature of water; contact of the said suspension with the second reaction fluid medium, during which there is formed the second solid fraction containing insoluble lignin; and the second liquid fraction containing saccharide, selected from a group of cellooligosaccharades, glucose and mixtures thereof; wherein the said second reaction fluid contains water and, optionally, carbon dioxide, while the said second reaction fluid medium has a temperature and pressure above the critical point of water and carbon dioxide; and reduction of the temperature of the above mentioned reaction mixture to a temperature below the critical temperature of water; and an optional hydrolysis of the said second liquid fraction for production of glucose.EFFECT: higher efficiency of biomass conversion from renewable resources and/or wastes in more valuable products.27 cl, 7 ex, 3 tbl, 15 dwg
FIELD: pulp and paper industry.SUBSTANCE: invention relates to systems for boiling of fibrous mass, more specifically to feeder of fibrous mass to the boiler. Sorting sieve in the upper separator for the boiler of cellulose material processing includes: a cylindrical plate having a vertical seam connecting opposite edges of the plate, and rows of slits passing through the plate, and each slit has a bent or chamfered edge of the inlet angle adjacent to the inner surface of the plate, and is inclined relative to vertical axis of the sieve.EFFECT: this design reduces chokage and clogging of the sieve slits.19 cl, 8 dwg
FIELD: chemistry.SUBSTANCE: invention relates to chemistry and can be used as filler for paper, in adhesives, sealants and plastics, as well as dry diluent in paint. Calcium oxide is slaked with water. Carbonisation is performed with gaseous carbon dioxide obtained from lime milk without stirring, without preliminary cooling in heat exchanger and without any additives. Precipitated calcium carbonate (PCC) is obtained. PCC is sieved, dehydrated, dispersed and/or ground. PCC product is obtained, which contains 85 % or more scalenohedral particles. PCC and PCC product are used to produce paper, paper coating paper product, ink paint plastic adhesive construction, food or pharmaceutical roduct.EFFECT: invention enables to create voluminous filled paper, which has high whiteness, improved opacity and stiffness.19 cl, 3 dwg, 2 tbl, 4 ex
FIELD: pulp industry.SUBSTANCE: proposed method comprises multi-pass refining at high consistency (MER, HCR) chemical or mechanical fibres using specific combinations of intensity of refinement and energy consumption for refining unit weight of cellulose. Cellulose nanofilaments (CNF) obtained using this invention are a mixture of thin filaments with width in sub-micrones and length from tens of micrometres to several millimetres. Obtained product forms a set of free filaments and filament associated with a core fibres, from which they are taken. Proportion of free and bound filaments is controlled, mostly, total specific energy applied to the cellulose mass in the refiner. Such CNF differ from other cellulose materials with fibrillar structure of their high coefficient of drawing and stored polymerisation degree (PD, DP) of cellulose. CNF obtained using this invention are excellent additive for strengthening of paper, cosmetic paper, paper cardboard and packaging materials, plastic composite materials and coating formulations. They demonstrate exceptional strengthening in case when used in unaffected drying paper webs.EFFECT: disclosed is a novel method of producing on an industrial scale CNF with high coefficient of drawing of natural lignocellulose fibres.21 cl, 13 dwg
FIELD: pulp industry.SUBSTANCE: method and plant for pulp manufacturing used in a kraft process include vertical reservoir operating under pressure, operating in intermittent mode, boiling vessel of continuous action with one or more tanks and other equipment used for subsequent processing non-bleached sulphate cellulose, for example, for washing, oxygen delignification and bleaching and drying. Feed and transportation system may include a high pressure feed system or direct feed and selectively performs material supply, containing organic fibres, in boiling vessel of continuous action during production of cellulose of lower grade and in vertical reservoir operating under pressure during production of cellulose of higher grade, for example soluble cellulose. Vertical reservoir operating under pressure is used for prehydrolysis and neutralisation, after which obtained pulp is directed to boiling vessel of continuous action for cooking. White liquor and the black liquor from same line can be used as neutralising media.EFFECT: same boiling vessel of continuous action is selectively used for boiling with respect to production of cellulose of various grades and quality.50 cl, 12 dwg
FIELD: pulp and paper industry.SUBSTANCE: invention relates to production of a dye with a starch component, which can be used in pulp and paper industry. Method of producing a dye with a starch component includes production of the starch component from a group of native starch or modified starch and its further reaction with an organic dye using mechanical mixing with the weight ratio of 1:1 or 1:2 respectively or adding 15-20 wt% of the dye to 5-10 % of the starch component suspension after correcting pH with subsequent spray drying. Dye is selected from any class of organic dyes.EFFECT: obtained starch-containing dye has improved adhesion properties and improved consumer properties due to providing simultaneous colouring in a wide range of colors and surface glueing of the paper.1 cl, 4 ex
FIELD: textile and paper.SUBSTANCE: invention is a composition for improvement of sizing of paper and cardboard during production, containing adhesive emulsion with an adhesive additive containing one or more aldehyde-functionalised polymers in stabilising amount, having at least one type of aldehyde-reactive monomer in said polymer. Said type of monomer is selected from non-ionic monomers, cationic monomers, anionic monomers, zwitterion monomers, as well as any combination of said substances, and one or more aldehyde-functionalised polymers having average molecular weight of at least 50,000 g/mol. Invention also relates to a method for improvement of production of paper and cardboard and improvement of sizing by adding described adhesive mixture in an effective amount in a paper detail machine and method of producing medium with cellulose fibres, which involves addition of said adhesive mixture to medium at any moment of paper production process.EFFECT: also described and claimed are novel adhesive mixtures in order to achieve improved sizing along with other advantages.15 cl, 3 dwg, 1 tbl, 5 ex
FIELD: textile and paper.SUBSTANCE: invention relates to fabric band for making corrugated cardboard strip in corrugated cardboard production machine. Band (1) at its both ends (2, 3) is connected in continuous tape, wherein external paper side (4) facing corrugated cardboard band is formed, as well as inner load-bearing side (5) matched with drive. To connect ends (2, 3) of band provided are connecting elements (6, 7), which have each on each end (2, 3) across band (1) multiple clamps (9') set at certain distance of (a) side by side, and at the opposite end fixed with connection section (14) on the corresponding end (2, 3) of the band. In longitudinal direction (8) of band (1) clamps (9') of one connecting element (6) able to transfer forces interact with clamps (9') of the other connecting element (7). For attachment of tape ends in simple manner in high load bearing simply opening connection is provided, that connection section (14) of connecting element (6, 7) is held in receiving slot (15) of band (1) and extends from end (2, 3) of band, between paper side (4) and loaded side (5).EFFECT: disclosed is fabric band for making corrugated cardboard strip.14 cl, 5 dwg
FIELD: chemistry.SUBSTANCE: invention relates to methods of producing polymer compositions, containing modified ingredients of vegetable raw material, more specifically to methods for producing multifunctional polymer products by liquid-phase catalytic oxidative modification of vegetable raw materials. Method of producing polymer product from vegetable raw material includes: liquid-phase oxidation of vegetable raw material, wherein the formed suspension is subjected to cavitation-hydrodynamic treatment in a rotary-oscillatory apparatus of "rotor-stator" type in resonance conditions at supply of oxygen and/or oxygen-containing gas to outlet zone of cavitation cloud of disruption of continuity of liquid phase from rotor channels in chamber of stator; formed mixture of low-molecular products and surface-active substances are removed.EFFECT: technical task of this invention is development of method for producing polymer products from vegetable raw materials with given properties at reduced time of oxidation process and reduced specific power consumption, as well as product produced using the said method.19 cl, 6 ex
FIELD: machine building; pulp industry.SUBSTANCE: present group of inventions relates to conical refiners or disc conical refiners for lignocellulosic materials, which can be used for production of stoneground wood pulp. Refining plate segment comprises a convex conical refining surface facing a concave conical refining surface of an opposing refiner plate. Convex conical fining surface comprises bars and grooves formed between adjacent bars. Angle of each bar increases at least 15 degrees with respect to the reference line that is parallel to the rotational axis of the refiner, wherein this angle is a holdback angle of between 10 to 45 degrees at the periphery of the refining surface. Each bar comprises a leading sidewall with an uneven surface having protrusions extending outwardly from the sidewall towards the side wall on the adjacent bar.EFFECT: use of refining plates in refiners intended for lignocellulosic materials provides higher efficiency of refiners in production of stoneground wood pulp.42 cl, 6 dwg
FIELD: pulp and paper industry.
SUBSTANCE: invention relates to tooling for moulding articles from cellulose. Device for moulding comprises a mould and a support plate with a cavity and flat support surfaces. Mould has porous body made by sintering and having outer moulding surface and inner surface. Mould inner surface is machined after sintering powder zone. Said mould surface zone is intended for connection with support surfaces of support plate to make vacuum chamber.
EFFECT: producing a high-quality mould, which does not require a large amount of energy for heating of shaping surface, a method which does not require high time expenses.
15 cl, 11 dwg
FIELD: technological processes.
SUBSTANCE: invention relates to production of laminates. Disclosed is coating layer with low tensile properties for laminate material. Cover layer comprises resin impregnated decorative paper with printing or without printing or impregnated with resin coating paper overlay or combination of both papers. Resin contains mixture of at least one of aminoplastic resin and at least one water-soluble or dispersible in water polymer material selected from group consisting of polyvinyl resin, polyvinyl acetate and polyvinyl alcohol. Amount of polymer material is 5-10 % of weight of resin. Invention also relates to use of proposed coating layer with low tensile properties for production of laminate material with function of back tension.
EFFECT: invention reduces cost of producing laminate material while maintaining quality of material.
SUBSTANCE: invention relates to controlling melt flowing on chute for melting from regeneration boiler into vessel for solution preparation. Device includes a throttle assembly, equipped with at least throttle valve, and drive to control its position. Portion of throttle valve is made in form of a solid element with an area defined by first side, opposite second side, and its height. Valve can turn between two specified positions, in first of which it does not limit melt flow at least partially, and in second - limits defined region of area of chute for melt.
EFFECT: higher safety and operational characteristics of device.
20 cl, 2 dwg
SUBSTANCE: invention relates to a security feature having a luminescent component that has at least one luminophore, consisting of a doped host lattice, and a component camouflaging the luminescence component, wherein the camouflaging component has at least two substances, wherein the first substance of the camouflaging component has an X-ray diffractogram that conceals the X-ray diffractogram of the luminescent component and the second substance of the camouflaging component has at least one cationic element of the luminescent component and at least one cationic element of the first substance of the camouflaging component, wherein the luminescent component and the first substance of the camouflaging component are formed from different cationic elements.
EFFECT: invention also relates to valuable documents having said security feature.
16 cl, 3 dwg, 9 ex