Method of manufacture of paper with transparent sites and paper with transparent sites, manufactured by this method

FIELD: textile, paper.

SUBSTANCE: method of manufacture of paper with transparent sites of the specified form includes grinding fibrous raw materials based on cotton, preparing a suspension for sheet formation, introduction of a filler, dye and other additives to the suspension, paper web formation, applying the composition to the local sites of the paper to increase transparency and its curing. As a filler, aluminium silicate is introduced into the suspension, characterized by an average particle size of not more than 7 mcm, whiteness of at least 95%. As a colorant, a dark dye is added in an amount of not more than 0.001 by wt % of the weight of absolutely dry fiber to the colour coordinate L* not less than 90.

EFFECT: increased protection against falsification.

2 cl, 10 ex

 



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention relates to emulsion for paper gluing, which includes gluing agent based on maleated vegetable oil, representing maleated triglyceride, in which at least 50 wt % of the total content of fatty acids in triglycerides are monounsaturated. Invention also relates to paper-gluing agent, including maleated vegetable oil, in which at least 50 wt % of the total content of fatty acids in triglycerides are monounsaturated, and alkenyl succinic anhydride, and/or fatty acid anhydride, and/or anhydride of fatty acid and acetic acid, and/or anhydride of fatty acid and rosin acid. It also relates to method of obtaining paper-gluing emulsion, including emulsification of gluing agent based on maleated vegetable oil, which represents maleated triglyceride, in which at least 50 wt % of the total content of fatty acids in triglycerides are monounsaturated, in water phase by means of emulsifier and/or by means of intensive mixing; or mixing maleated vegetable oil, which represents maleated triglyceride, in which at least 50 wt % of the total content of fatty acids in triglycerides are monounsaturated, with alkenylsuccinic anhydride and/or fatty acid anhydride.

EFFECT: invention makes it possible to increase gluing efficiency.

26 cl, 17 ex, 7 tbl, 6 dwg

FIELD: textile; paper.

SUBSTANCE: composition contains a fibrous mixture from chemical and thermomechanical mass and cellulose. The fibrous mixture contains birch leached chemical and thermomechanical mass with extent of grinding 60-125 ml (CSF) and cellulose with grinding extent of 350-500 ml (CSF) at the specified ratio of components. The cellulose in the fibrous mixture is a leached pine sulfate cellulose and/or pine sulphite cellulose, or pine cellulose, and/or leaf cellulose.

EFFECT: expansion of leaf-bearing soft woods due to using birch leached chemical and thermomechanical mass to prepare a fibrous semi-finished product to produce paper with high physical mechanical indices to ensure extent of whiteness.

3 cl, 1 tbl

Wipe product // 2430709

FIELD: medicine.

SUBSTANCE: wipe product relates to absorbent paper products. A wipe product represents a wipe sheet having a first side and a second side. The wipe sheet contains cellulose fibres in an amount at least 50 wt %, and an additional composition containing polymer. The additional composition is present at least on the first side of the wipe sheet. The wipe product has extensionality exceeding 3 cm3/g, a fluffiness test value less than approximately 3 mg, and the first side of the wipe sheet has a stick-slip value more than approximately 0.01. The additional composition contains a non-fibrous olefin polymer, ethylene carboxylic acid copolymer or their mixture. The additional composition can be included in a wipe cloth by means of fibre combination to be used for cloth formation. Alternatively, the additional composition can be superficially applied on the formed cloth.

EFFECT: better quality of the wipe product.

20 cl, 42 dwg, 18 tbl, 7 ex

FIELD: textile, paper.

SUBSTANCE: method includes moistening pulp lap with water solution of sodium salt of carboxymethylcellulose (NaCMC), included into composition of the paste made of a filler (chalk), mixed with a solution of NaCMC at the filler ratio of NaCMC equal to 100:(1-2). Production of moisture-saturated air suspension of fibres with filler from it. Forming a fibrous later on a shaping mesh. Moistening of a fibrous layer between two clothes, pressing and drying of a paper leaf. The filler is added as a paste, which contains 30% of dry substance. Moistening of a fibrous layer prior to pressing is carried out with a starch solution with concentration of 0.7-1.3%.

EFFECT: increased retention of filler in paper at simultaneous increase of paper strength index.

3 cl, 1 tbl, 4 ex

FIELD: textile, paper.

SUBSTANCE: method to prepare bleached paper material includes production of a bleached paper material and putting the latter in contact with efficient quantity of one or more oxidants, excluding organic peroxyacids. The method to produce a paper item includes production of a bleached paper mass. Water suspension from this mass is created. The suspension is dehydrated to make a sheet and drying. At the same time efficient quantity of one or more oxidants are added into the bleached paper mass or its suspension, excluding organic peroxyacids. Or an efficient quantity of one or more oxidants are added onto a sheet, including organic peroxyacids. The method to produce a paper item (a version) includes production of a bleached paper mass and creation of a thick suspension from it. Then the efficient quantity of one or more oxidants are added into the thick suspension, as well as one or more optical bleaches. Afterwards the thick suspension is dissolved, dehydrated to produce a sheet and dried. When using oxidants in a combination with optical bleaches and/or chelating agents, a synergetic effect is observed.

EFFECT: increased and stabilised brightness of a paper mass or paper and increased stability to their yellowing.

24 cl, 9 tbl

FIELD: textile, paper.

SUBSTANCE: method includes dissolution of cellulose and its grinding down to specified extent of grinding. Preparation of the first dispersion with application of return water, containing fibres of microcrystal cellulose, produced by its grinding in mixture with titanium dioxide and calcium hydroxide in specified amount. The second dispersion is prepared from cellulose fibres with application of return water. Then the first suspension is mixed with the second, and produced mixture is treated with carbon dioxide. In case of this treatment calcium hydroxide under action of carbon dioxide results in production of chemically deposited chalk and production of paper mass at specified ratio of components. Grinding of microcrystalline cellulose in mixture with titanium dioxide and calcium hydroxide is carried out in vibration mill with provision of impact and wear effect at mixture.

EFFECT: increased extent of fillers retention in paper, improvement of its printing properties, provision of possibility to vary bulk and porosity of paper, provision of possibility to use fully closed cycle of return water.

1 tbl, 8 ex

FIELD: construction.

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

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

22 cl, 1 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: napkin article with density of over 3 cm3/g includes a napkin made from cellulose fibre and an additive composition on the first side of the napkin which contains a non-fibrous olefin polymer, an ethylene-carboxylic acid copolymer or mixture thereof. The napkin article is made using a method which involves preparation of an aqueous suspension of cellulose fibre, forming a napkin from the aqueous suspension of fibre and drying the napkin. The additive composition is deposited on dry fibres before preparation of the aqueous suspension of fibre, and is added to the aqueous suspension of fibre or for formation of the napkin. The additive composition contains a non-fibrous olefin polymer, an ethylene-carboxylic acid copolymer or mixture thereof and a dispersing agent.

EFFECT: high strength of the napkin without considerable negative effect on softness.

28 cl, 26 dwg, 6 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: aqueous dispersion contains A) 0.05-10 wt % salts of perfluoropolyester derivatives of dicarboxylic acids of formula T-O-Rt-T, where T = -CF2-COOZ or -CF2CF2-COOZ, Z - Na, K, NH4, R1(R2)(R3)N, R1=R2=alkyl or hydroxyalkyl, R3 = H, alkyl or hydroxyalkyl, Rf denotes (per)fluoropolyoxyalkylene chain with number-average molecular weight of 500-10000, and B) 0.01-5 wt % water-dispersible or water-soluble cationogenic polymers with charge density in dry polymer greater than 1 mEq/g. The dispersion is obtained by dispersing 0.05-10 wt % component (A) in water. Cationogenic polymer (B) is slowly added to the obtained dispersion while stirring until achieving weight ratio of (A) to (B) of 1:1-5:1.

EFFECT: dispersions which endow paper with improved oil-repellent properties against compounds with high content of fat or fatty acids.

14 cl, 16 tbl, 17 ex

FIELD: paper industry.

SUBSTANCE: methods refer to manufacturing of bleached cellulose material, prevention of yellowing and loss of whiteness in bleached craft-cellulose, and manufacturing of paper goods. In process of bleached cellulose material manufacturing, bleached craft-cellulose is produced and exposed to contact with sufficient amount of more or several reducing agents. Additionally bleached craft-cellulose is exposed to contact with one or several optical bleach, with one or more chelating agent. Method for prevention of yellowing and loss of whiteness of bleached craft-cellulose in storage includes addition of efficient amount of one or more reducing agent into bleached cellulose and possibly one or more chelating agent, one or more polycarboxylate or their combinations. Method for production of paper goods includes production of bleached craft-cellulose, formation of initial water suspension from it, water drainage with formation of sheet and sheet drying. Besides efficient amount of one or more reducing agent is added into bleached craft-cellulose, initial suspension or sheet. Additionally one or more chelating agent is added there, one or more optical bleach, one or more polycarboxylate, or their combination.

EFFECT: improved quality of paper goods, increased stabilisation of whiteness and increased resistance to yellowing in process of paper production and to thermal yellowing, improved colour pattern.

17 cl, 33 tbl

FIELD: textiles, paper.

SUBSTANCE: method includes providing a fiber-containing suspension, in which at least about 60% wt. fibers are cellulosic fibers, and dewatering the suspension on a wire mesh to form the cellulosic fibrous canvas. The method additionally comprises adding particles comprising silica and a reinforcing in the wet state agent in the moulded canvas. The present invention also relates to a product obtained by this method. The invention furthermore relates to an aqueous dispersion having a pH in the range from 2 to 7 and containing particles containing silica and the reinforcing in the wet state agent. Another aspect of the invention relates to the use of the dispersion as an additive in the papermaking process.

EFFECT: increasing strength and stiffness of the paper in the wet state.

17 cl, 3 ex, 6 tbl

FIELD: textiles, paper.

SUBSTANCE: porous fibrous product is proposed comprising cellulose or wood fibers between which by means of the binder selected from silica, alum or aldehyde the structural filler particles are attached. The application of the product for the manufacture of sack cloth and paper packets is proposed, and also the method of producing this product in which in the spray dryer the filler drops are obtained from the aqueous solution of the filler, forming in water evaporation the filler particles attached by means of the binder to the cellulose or wood fibers.

EFFECT: obtaining low-cost porous fibrous product with high strength properties.

13 cl, 16 dwg, 3 tbl, 3 ex

FIELD: textiles, paper.

SUBSTANCE: method includes preparation of the first paper pulp from dispersion of paper fibers milled to the required fineness of grind by adding to it of cationic polyacrylamide, a second paper pulp from dispersion of mixture of bleached hardwood pulp, milled to the required fineness of grind, with a small amount of bleached softwood pulp by adding to the dispersion of bentonite 10-20 kg per ton of dry fiber, and then the suspension of mixture of talc and chalk in the amount of 50-200 kg per ton of fiber, and then the emulsion of alkenyl succinic anhydride stabilised with starch. Cationic polyacrylamide is added the last. The suspension of chalk and talc is prepared in a mixer under conditions providing intensive abrasing effect of chalk particles on talc particles. Talc contains at least 80% of particles with a size of 5-50 mcm and not less than 70% of particles with a size of 5-30 mcm.

EFFECT: improvement of the method.

4 cl, 1 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a sol containing silicon dioxide based particles, preparation and use thereof. The sol contains silicon dioxide based particles with axial ratio of at least 10 and specific surface area of at least 600 m2/g. The invention also relates to a sol containing silicon dioxide based particles with axial ratio of at least 10 and S-value approximately not higher than 25%. The invention also relates to a method of making paper, where a sol containing silicon dioxide based particles is used as an agent for increasing dehydration and retention of filler.

EFFECT: disclosed colloidal solutions (soles) have improved working characteristics for dehydration and retention of filler, as well as high stability of surface area with very small surface areas and content of SiO2.

27 cl, 15 tbl, 25 ex

Paper sizing // 2429323

FIELD: textile, paper.

SUBSTANCE: invention relates to a water dispersion (its version) of a cellulose-active gluing substance (its version), a method to produce the water dispersion (its version), application of the water dispersion and a method of paper making. The water dispersion of the cellulose-active gluing substance contains an acid anhydride, an anion polyelectrolyte and a nitrogen-containing organic compound, which is an amine or a corresponding quaternary ammonia compound, having the molecular weight of less than 180 or having one or several hydroxyl groups. The method to produce the water dispersion of the cellulose-active gluing substance and its version includes dispersion of the acid anhydride in the water phase in presence of the anion polyelectrolyte and the nitrogen-containing organic compound, which is the amine or the corresponding quaternary ammonia compound, having the molecular weight of less than 180 or having one or several hydroxyl groups. The above specified water dispersions of the cellulose-active gluing substance may be used for sizing in mass or for surface sizing in paper making. The method of paper making includes addition of the above-specified water dispersions of the cellulose-active gluing substance to the water suspension of cellulose with subsequent dehydration of the produced suspension on a net of a paper-making machine or by application of these dispersions onto a surface of a cellulose sheet.

EFFECT: improved stability of the gluing water dispersion and efficiency of sizing, energy and capital cost saving.

41 cl, 13 tbl, 7 ex

FIELD: chemistry.

SUBSTANCE: aqueous polysilicate composition is meant for producing paper and cardboard and can be used in pulp and paper industry. The aqueous polysilicate composition contains a component based on polysilicate microgel combined with particles obtained from colloidal polysilicate. The method of preparing the aqueous polysilicate composition involves mixing aqueous colloidal polysilicate with an aqueous phase of polysilicate microgel. This composition or a composition obtained using the method described above can be used as a flocculant when producing paper and cardboard. The method of producing paper or cardboard involves preparation of a cellulose suspension and flocculation of said suspension using a flocculation system containing said polysilicate composition. The suspension is then drained on a mesh to form a sheet which is then dried.

EFFECT: high efficiency of the disclosed aqueous polysilicate composition owing to improved holding or draining when making paper or cardboard, as well as stability thereof during storage.

24 cl, 11 tbl, 3 ex, 9 dwg

FIELD: textile, paper.

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

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

34 cl, 5 tbl, 5 ex

FIELD: textile; paper.

SUBSTANCE: method (in version) concerns paper manufacturing and can be applied in pulp and paper industry. Method involves: (i) supply of water suspension containing pulp fiber, (ii) adding to suspension after the last point of severe shear force exposure of: (a) first anion component of anion organic polymer soluble in water; (b) second anion component of anion organic polymer dispersed in water or branched organic polymer; and (c) third anion component of anion material containing silicon; and (iii) dehydration of obtained suspension to produce paper. Also invention concerns composition (in version) including first, second and third anion components, and application of the composition as flocculation agent in production of pulp mass and paper for water treatment.

EFFECT: improved water drainage and retaining during paper manufacturing out of any type of pulp suspensions, accelerated operation of paper-making machine, reduced polymer dosage applied.

56 cl, 3 tbl, 4 ex

FIELD: textiles, paper.

SUBSTANCE: method refers to pulp-and-paper industry, specifically to method for making bag paper, as well as to bag paper with improved service properties. Method for making bag paper involves pulp beating stage at fibre concentration 28-40% and thereafter at fibre concentration 3-6%. It is followed by two-staged addition of reinforcing and at once flocculating agent to pulp. Then paper web is casted and dried. Further beating stage at fibre concentration 3-6% requires power consumption within 20-60 kWt/h per paper ton. The second stage of addition is followed with the third stage of addition implying flocculating agent preceding headbox. Herewith at the first stage, reinforcing and at once flocculating agent is cationic starch of fractional substitutionality 0.040-0.150 in amount 0.1-1.2% of absolutely dry fibre weight, or polyacrylamide in amount 0.1-0.5% of absolutely dry fibre weight. Specified agent is added to pulp, 5-120 minutes prior to paper web casting. At the second stage reinforcing and at once flocculating agent is added in amount 0.005-0.400% of absolutely dry fibre weight. Specified agent is added to pulp, 20-120 seconds prior to paper web casting. At the third stage flocculating agent is anionic montmorillonite microparticle dispersion. Specified agent is added to pulp in amount 0.05-0.50 % of absolutely dry fibre weight. Bag paper is made under the offered method.

EFFECT: lower consumption of reinforcing and flocculating polymers, improved pulp water yield on papermaking machine grid and enhanced consumer paper properties including paper air permeability.

4 cl, 1 tbl, 3 ex

FIELD: production of paper and paper products in pulp-and-paper industry.

SUBSTANCE: method involves adding effective amounts of at least one cation-active polymer coagulant or inorganic coagulant with following adding of material consisting of microparticles, wherein pulp contains cellulose produced at least partly from processed paper products. Coagulant used is of natural or synthetic origin. Material based on microparticles is, for example, bentonite clay, network polymer, colloidal silicon, or polysilicate.

EFFECT: increased efficiency in reducing of white resin sedimentation.

17 cl, 2 dwg, 2 ex

FIELD: printing.

SUBSTANCE: document comprises a substrate and a protective element comprising the first and the second structures contained on the substrate. The substrate also comprises a region which is translucent or even transparent, and within which the first and second structures are located at least partially. The first and the second structures within the transparent area when the document is viewed in reflected light have at least the first and the second colours, respectively, and when the document is viewed in transmitted light, a mutual change of the said first and second colours occurs.

EFFECT: improved protection.

12 cl, 14 dwg

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