57results about How to "Improve filler retention" patented technology

The invention concerns a pigment, filler or mineral containing a natural calcium carbonate, treated with one of more providers of H3O<+> ions and gaseous CO2, allowing a reduction in the weight of paper for a constant surface area without loss of physical properties when it is used as a pigment or coating filler for the said paper. In particular, the invention concerns a pigment, filler or mineral containing a natural calcium carbonate or dolomite or mixtures of talc and calcium carbonate, of kaolin and carbonate or carbonate alone or in combination with natural and/or synthetic fibers or similar, treated with one or more medium-strong or strong providers of H3O<+> ions in the presence of gaseous CO2. Applications are particularly in the paper industry, obtaining in particular good sheet properties i.e. a reduction its weight for a given surface area.

The invention relates to a method for improving the retention of sizing agent fiber and filler in production of tobacco sheets through the paper-making process. According to the technical requirements, natural potato starch is selected and used as a wrapping agent, and then the surface of the filler is wrapped or the filler is partially wrapped in the wrapping agent; a charge control agent is selected and used for regulating the charge on the surface of the sizing agent fiber, then the filler wrapped in the wrapping agent is added to a tobacco sizing agent, and production of the tobacco sheets through the paper-making process is conducted for improving the retention of the fiber and the filler. The method is applied to the production technology of the tobacco sheets through the paper-making process; by means of the method, the retention of the fiber and the filler in the sizing agent can be remarkably improved, loss of fine fiber and filler is reduced, the utilization rate of raw materials is increased, and the quality of the tobacco sheets is not affected. The method has the advantages that operation is simple, equipment is common and pollution is avoided.

The invention belongs to the special papermaking production field, and specifically relates to a high-bulk papermaking method reconstruction tobacco leaf fiber composition and a preparation method and application; the reconstruction tobacco leaf comprises a tobacco raw material, wood long fibers and wood short fibers, and is prepared by mixing said compositions; the short fibers are arranged in a Z-type in a water filtering process, thus effectively improving the bulk property and spreading rate while fully ensuring the substrate tensile strength and paper machine operationability, improving filling material retention rate and product yield, reducing production cost, improving product fully combustion level, and reducing CO release amount.

A novel filler treatment comprising the preparation of swollen starch-latex compositions, prepared in the presence or absence of co-additives, and the addition of the said composition to a filler suspension, has been developed. Use of the treated filler during papermaking improves filler retention and produces filled papers where addition of the filler has only a minimal negative effect on strength properties. The swollen starch-latex compositions can be prepared in a batch or jet cooker, or by mixing with hot water under controlled conditions (i.e., temperature, pH, mixing, mixing time) in order to make the starch granules swell sufficiently to improve their properties as a filler additive but avoiding excess swelling leading to their rupture. The swollen starch-latex composition is then rapidly mixed with the filler slurry, preferably in a static mixer, and added to the papermaking furnish at a point prior to the headbox of the paper machine. The starch-latex composition can be used with wood-free or wood-containing furnishes. The treated filler is easily retained in the web during papermaking, improves drainage, and gives sheets having good formation. Sheets made with the treated fillers have higher bonding and tensile strengths than sheets produced using filler treated with either swollen starch alone or latex alone. Retention and drainage are further improved when conventional retention aid chemicals are added to the furnish containing the treated filler. The use of swollen starch-latex compositions could allow the papermaker to increase the filler content of the paper without sacrificing dry strength properties or increasing the amount, and hence the cost, of the retention aid added. The combination of swollen starch and latex could be used as furnish additives in the manufacture of both filled grades and grades that contain no filler such as sack papers and paperboard products.

The invention discloses a manufacture method of a secondary-seaming ternary-papermaking forming net. Sixteen heald frames are adopted to interweave polyester or nylon monofilaments into three layers of different weaving structures into a whole, the three layers of different weaving structures comprise a paper-forming layer, an intermediate connecting layer and a machine layer, the minimum tissue unit comprising sixteen polyester monofilaments as warps and thirty-two polyester or nylon monofilaments as wefts, the warp number ratio of the paper-forming layer to the machine layer is 1:1, the weft number ratio of the paper-forming layer to the machine layer is 2:1, and the intermediate connecting layer comprises one half of total wefts and is characterized by being formed by the secondarily seaming of the self warp seaming and the self weft seaming of the paper-forming layer. The invention has the advantages of smooth papermaking surface, firm interlayer binding force, no internal abrasion or net elongation and compact and even net structure, and the machine layer has wear resistance, small thickness, long service life and strong dewatering performance.

The invention discloses a preparation method of bamboo fiber paper cups. The invention relates to a bamboo fiber paper cup and a production process thereof. The bamboo fiber paper cup mainly structurally comprises a hollow fiber cup body, and is characterized in that the cup body comprises an outer layer, an inner layer, a hollow layer arranged between the outer layer and the inner layer and a coating layer above the inner layer. The outer layer and the inner layer are prepared from the following components in parts by weight: bleached bamboo fibers, dahurian larch fibers, modified starch, chitosan, talc powder, a dispersant, guar gum, glyceride hydrolase and a wet-strength agent. The hollow layer is prepared from the following components in parts by weight: polypropylene hollow short fiber pulp, dahurian larch fibers, chitosan, talc powder and a dispersant. According to the above settings, the outer layer and the inner layer are produced by employing bamboo fibers. The bamboo fiber pulp not only is environment-friendly, but also has the characteristics of being excellent in antibacterial property, bacteriostatic and free of peculiar smells. The hollow fiber layer has the functionsof being light in weight, heat insulative and warm-keeping. The bamboo fiber paper cup serving as a hot drink paper cup and a cold drink paper cup simultaneously is relatively safe.

The invention relates to a whitewater processing method comprising the steps that: the pH value of the whitewater is regulated to 8-14; a certain amount of a mixed solution of a flocculating agent and a cationic polymer is added to the whitewater, until the total mass concentration of the flocculating agent and the cationic polymer in the whitewater is 1000-3000ppm. In the mixed solution, the mass concentration of the flocculating agent is 1-5%, and the mass concentration of the cationic polymer is 0.1-0.5%. According to the invention, papermaking whitewater is processed by using the whitewater processing method provided by the invention, and is then used in preparing slurry. Therefore, paper one-time retention rate and filler retention rate can be substantially improved, and paper bursting index and tensile strength index are improved to a certain extent. Also, when the slurry is used in papermaking, concentration, turbidity, conductivity, and COD of collected under-mesh whitewater are greatly reduced, such that whitewater recycling time can be increased.

The invention relates to a preparation method and application of a polyacrylamide/keramite nanotube composite papermaking filler. The preparation method comprises the following steps of: adding a keramite nanotube into aqueous solution of acrylamide monomer or mixed solution of water and ethanol of acrylamide, then loading acrylamide monomer molecules to a cavity of the keramite nanotube by using vacuum negative pressure, and preparing the keramite nanotube/acrylamide composite monomer; and then through a free radical solution polymerization reaction, polymerizing the keramite nanotube/acrylamide composite monomer, and a polyacrylamide molecule chain penetrating through the keramite nano cavity, so as to prepare the olyacrylamide/keramite nanotube composite papermaking filler. The olyacrylamide/keramite nanotube composite papermaking filler is added into the papermaking pulp, so that the amount of fillers in the paper can be increased; and the effect on physical strength of the paper caused by adding the fillers can be reduced.

The invention discloses a production method of lightweight paper. The production method comprises a wood pulp proportioning step and a mixing step. Needle BCMTP chemimechanical pulp and needle bleached chemical wood pulp are proportioned and pulped; a neutral sizing agent, cationic starch, cationic polyacrylamide and talcum powder are used; then a paper manufacturing process is performed. Importedneedle wood pulp and broadleaf wood bleached sulfate pulp are respectively pulped and blended, and various additives are added; the blend is conveyed into an approaching system for dehydration forming through a wet part and then is further dehydrated through a squeezing part; after pre-drying, semi-dry calendaring and surface sizing are performed, the product is dried through a drying part; the product is baked at low temperature, subjected to soft calendaring finishing and wound. First of all, high bulkiness is achieved, and the flatness and the tensile strength of paper are not affected, sothe production method is suitable for high-speed printing; secondly, no flourescent brightener is contained; compared with common coated paper, offset paper and lightweight paper, the lightweight paper produced according to the method is relatively dark and has a color close to the primary color of wood pulp, so that visual fatigue cannot be caused by long-time reading.

The invention discloses a complex method for compounding a special filling, comprising the following steps that: the special filling is dispersed into a dispersed suspending liquid with a mass concentration ranging from 1 to 30 percent, the dispersed suspending liquid is mixed with a macromolecule water solution with a mass concentration ranging from 1 to 25 percent to obtain a mixture, the mixture and an acidic electrolyte bath solution are mixed evenly, or a fatty acid is added into the mixture and is mixed evenly to obtain a solution, and then the solution and the acidic electrolyte bath solution are mixed evenly; after let stand, an upper layer of clear solution is eliminated, a lower layer of white substance is the special compounded filling. The complex method can improve the hydrophilicity of the special filling and the fiber, increases the use amount of the special filling and obviously improves the intensity of the paper. The complex method can improve the retention of the filling, increase the whiteness of the paper, reduces the waste water processing load and further saves the fiber use amount.

The invention discloses inorganic powder highly filled polyolefin fiber paper and a production method thereof. The polyolefin fiber paper is prepared from the raw materials in proportion: 10% to 20% of polyolefin, 0.1% to 2% of coupling agent, 0.1% to 1% of dispersing agent, 1% to 10% of compatibilizer, 0.1% to 2% of plasticizer, 1 to 5% of hot-melt type adhesive, 0.1% to 2% of surface active agent, 0.1% to 1.5% of rheology modifier and 75% to 85% of inorganic powder. The production method comprises the steps of evenly mixing and stirring polyolefin and the rheology modifier under the assistance of a technology to improve a melt index and fluidity of polyolefin; sequentially adding the compatibilizer and the plasticizer to be evenly stirring and mixed; then sequentially adding the activated inorganic powder and the activated hot-melt type adhesive and evenly mixing and stirring; processing through the work procedures of mixing, kneading, drawing fiber, preparing a finished product fromfiber stuff and the like to obtain the inorganic powder highly filled polyolefin fiber paper. According to the inorganic powder highly filled polyolefin fiber paper disclosed by the invention high filling of inorganic powder is achieved, a resin use amount is reduced, tensile strength, impact strength and surface smoothness of the product are enhanced, and a filler retention rate is improved.

The invention discloses a composite method for a composite calcium carbonate filler, comprising following steps: dispersing calcium carbonate to be suspending liquid with a mass concentration of 1-50, mixing it evenly with high molecule aqueous solution with a mass concentration of 1-30to obtain a blend, the mass ratio of calcium carbonate to the high molecule aqueous solution is 50:1-1:5; mixing above blend with acidic electrolyte solution, the volume ratio of the acidic electrolyte solution to the blend is 1:1-10:1, mixing evenly, standing, removing supernatant liquor, the white lower layer matter is the composite pearl filler. The invented method can increase fibrous hydrophilicity, increase filler retention, enhance paper intensity and whiteness, and saving fabric.

The invention provides 24 harness self-binding polyester three-layer wire-cloth, wherein polyester and nylon monofilament is interwoven to be composite intertexture of a structural connection whole body of a paper forming layer, an intermediate connection layer and a machine layer by 24 pieces of harness frames, the minimum organization unit is composed of 24 polyester monofilaments as a warp thread and 36 polyester or nylon monofilament as a weft thread. Number ratio of warp threads of the paper forming layer to that of the machine layer is 1:1, and number ratio of weft threads is 3:2; the number of weft threads is 2/6 of total number of the weft threads; the paper forming layer employs plain weave method, and the machine layer employs 6 harness weave method. The invention has advantages of high fibre supporting index, high retention of fibre and fillers, uniform forming of page, easy peeling of page from net, flattening paper forming, firm combination of upper and lower layers, good abrasive resistance and long service life.

The invention provides a preparation method and application of tobacco cationic hemicellulose. The preparation method includes the specific steps that solid phase materials are extracted from waste tobacco raw materials and then mixed with an alkali solution for heating and stirring to collect the filtrate, ethanol is added for filtering to collect precipitate, the precipitate is dried to obtain tobacco hemicellulose, sodium hydroxide is added for stirring and carrying out a reaction, a cationic surfactant is slowly added for carrying out a reaction for 1-3 hours, a weak acid is added for neutralizing, precipitation is carried out by ethanol, and then the precipitate is collected after filtering, washed with ethanol and dried to obtain the tobacco cationic hemicellulose. The tobacco cationic hemicellulose prepared by the method can be used as a retention aid for slurry of reconstituted tobaccos, can effectively improve the filler retention rate, the water filtering performance of the slurry and the ability for absorbing anion interference substances and reduce the load of plain boiled water and waste water, is easily biodegradable, improves the combustion performance of the reconstituted tobaccos, reduces the released amount of tar and CO and improves the sensory quality of cigarettes to a certain extent.

The invention discloses a composite method for a composite talcum powder filler, the method comprises the following steps of: dispersing talcum powder into dispersing suspension with 1 to 50 percent mass concentration, after mixing evenly with macromolecular water solution with 1 to 30 percent mass concentration, mixing the talcum powder with acidic electrolyte solution, and stirring evenly; or adding fatty acid and mixing evenly, then mixing with the acidic electrolyte solution, and stirring evenly; after standing the stirred evenly liquid and removing an upper layer of clear liquid, a lower layer of white substance is the composite talcum powder filler. The composite method for the composite talcum powder filler can improve hydrophilicity of the talcum powder and fiber, increase amount of the talcum powder as well as strength of paper, the composite method for the composite talcum powder filler also has the advantages of improving filler levels, increasing paper brightness, reducing wastewater treatment load and further saving the using amount of the fiber.

The invention discloses a twenty-four-heald composite fiber polyester three-layer papermaking net which is an integrated composite intertexture formed by using twenty-four healds to interweave polyester or nylon single yarn. The twenty-four-heald composite fiber polyester three-layer papermaking net comprises a paper forming layer, a middle connecting layer and a machine layer, wherein the paper forming layer, the middle connecting layer and the machine layer are different in weaving structure, the 1/1 plain weaving method is adopted for the paper forming layer, the six-heald weaving method is adopted for the machine layer, and the middle connecting layer comprises a pair of connecting wefts which are used for connecting the paper forming layer and the machine layer. Due to the fact that the 1/1 plain weaving method is adopted for the paper forming layer, the fiber supporting index is made to be improved, meshes are even and smooth, the retention rate of fiber and padding of paper is improved, paper page forming is even, and a paper page can be stripped off the net easily. The pair of connecting wefts is used for connecting the paper forming layer and the machine layer, so that the upper layer and the lower layer are connected with each other more firmly. The six-heald weaving method is adopted for the machine layer, so that the span of wefts of the machine layer is increased, abrasive resistance of the forming net is improved, and service life is longer.

The invention provides a technical method for improving the filler retention rate and paper evenness of a high-speed paper machine and improving the paper forming strength by using a chitosan/montmorillonite binary particle retention aid system or a chitosan/cationic polyacrylamide/montmorillonite ternary retention aid system. The bio-based chitosan/montmorillonite microparticle retention aid system of the invention adopts chitosan with a deacetylation degree of 80-95 %, the dosage of chitosan is 0.03-0.1 % of the mass of the absolutely dry fiber raw material, the dosage of montmorillonite is0.1-0.5 % of the mass of the absolute dry fiber raw material, the cationic polyacrylamide is 0.03-0.1 % of the mass of the absolutely dry fiber. According to the method, the filler retention is improved under the condition of high shear force, the paper evenness is improved, and the problem that the paper strength is reduced due to the increase of ash content is solved.

The invention discloses a high-speed wide 16-heald mesh-mark-free three-layer paper making mesh. The high-speed wide 16-heald mesh-mark-free three-layer paper making mesh is integrated composite intertexture which is formed by interweaving polyester or nylon monofilaments through 16 heald frames, and the high-speed wide 16-heald mesh-mark-free three-layer paper making mesh comprises the three different woven structures of a finished paper layer, a middle connecting layer and a machine layer. A 1/1 plain weaving method is adopted by the finished paper layer, an eight-heald weaving method is adopted by the machine layer, the middle connecting layer comprises a pair of connecting weft yarns, and the finished paper layer and the machine layer are connected. Due to the fact that the 1/1 plain weaving method is adopted by the finished paper layer, the fiber supporting index is improved, meshes are even and smooth, the fiber and packing retention of paper is improved, paper forming is even, the paper can be separated from the mesh easily, and the finished paper is smoother. The connecting weft yarns are used for being connected with the two layers, and the upper layer and the lower layer are combined more firmly. The eight-heald weaving method is adopted by the machine layer, the span of the weft yarns of the machine layer is increased, the abrasion resistance of the forming mesh is improved, and the service life is longer.

The invention discloses a method for preparing carboxyl-type amphoteric starch in one step by a semi-dry process, which is characterized in that: firstly adding a cationic reagent 3-chloro-2-hydroxypropyl-trimethylammonium chloride to carry out etherification reaction on the original starch, After the etherification reaction, directly add the anionizing reagent monochloroacetic acid to carry out the carboxymethylation reaction. Both anionization and cationization reactions are carried out in one kettle to prepare carboxy-type amphoteric starch in one step, and the production process is uninterrupted. The invention can effectively solve the shortcomings of wet process and dry process. Cationic and anionic groups are connected in the same starch chain, so that the product has the characteristics of cationic starch and anionic starch, and various performances are improved; the reaction time can be shortened from 8 hours to 6 hours; due to the shortened process, energy saving and consumption reduction, so that The product cost can be saved by about 12%.