97results about How to "Increased tensile index" patented technology

The invention relates to high-air-permeability mixed pulp, which contains high-air-permeability straw pulp. The mixed pulp contains 10-100 percent of high-air-permeability straw pulp and 0-90 percent of other pulp by weight percent. Preferably, the weight percent of the high-air-permeability straw pulp is 30-97 percent and the weight percent of other pulp is 3-70 percent. More preferably, the weight percent of the high-air-permeability straw pulp is 51-95 percent and the weight percent of other pulp is 5-49 percent. The most preferably, the weight percent of the high-air-permeability straw pulp is 71-93 percent and the weight percent of other pulp is 7-29 percent. The other pulp is one or more of wood pulp, bamboo pulp, cotton pulp and secondary fiber. Preferably, the wood pulp and the bamboo pulp are selected. The mixed pulp has the advantages that the drainage capacity is good, the high-speed paper machine can be used during papermaking and the production efficiency is further improved.

The invention relates to an inorganic mineral fiber ring crush strength-improvement surface sizing agent for papermaking and a preparation method thereof. The inorganic mineral fiber ring crush strength-improvement surface sizing agent comprises surface sizing starch and inorganic mineral fibers. The mineral fibers comprise composite mineral fibers, modified wollastonite or wollastonite. The inorganic mineral fiber ring crush strength-improvement surface sizing agent comprises 5-40wt% of the inorganic mineral fibers. The norganic mineral fiber ring crush strength-improvement surface sizing agent can greatly improve corrugated paper ring crush strength and improve a tensile index and folding strength of a coated paper.

The invention relates to a method for pre-treating wood chips by hot water before preparing chemi-mechanical pulp. The method comprises the following steps: after soaking the wood chips, spirally extruding the wood chips; adding water into the wood chips which are spirally extruded, carrying out self-hydrolyzing pre-treatment on a mixture of the wood chips and water, and obtaining a pre-hydrolysate and the wood chips after self-hydrolyzing pre-treatment; and collecting the extruded wood chips as a raw material of chemi-mechanical pulp to obtain the wood chips after pre-treatment by hot water. The pre-treatment method provided by the invention fully uses existing part of equipment in the pulping industry without external complex equipment, and only water, small amount of dilute acids and ethanol are used without purchasing other chemicals, so that the pre-treatment process can be realized, thereby greatly saving the comprehensive production cost. Meanwhile, the method is beneficial for effectively combining pulping and papermaking with bio-refinery by existing enterprises.

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 discloses a preparation method of polyester meta-position aramid fiber composite paper. The method comprises the following steps: pretreating PET (polyethylene terephthalate) chopped fibers; carrying out primary fluffing on the pretreated PET chopped fibers by using a fluffer; adding meta-position aramid fiber pulp fibers, and carrying out secondary fluffing; finally adding a dispersing agent, and carrying out tertiary fluffing to obtain a suspension; injecting the suspension into a paper former, and carrying out dewatering forming, pressing and drying to obtain polyester meta-position aramid fiber composite paper base paper; injecting the suspension into a paper former, carrying out dewatering forming, pressing, and drying to obtain aramid fiber electric-insulation paper base paper; and carrying out hot pressing on the obtained polyester meta-position aramid fiber composite paper base paper. The preparation method can maximally utilize the chopped fibers with high strength and polyester fibers with lower softening temperature as binding fibers, thereby enhancing the strength property and insulating property of the meta-position aramid fiber paper.

The invention relates to a little-chlorine and little-pollution bleaching process for paper pulp biomimetic pretreatment, in particular to a little-chlorine element chlorine-free bleaching (ECF) process for the paper pulp biomimetic pretreatment. The process is a novel little-pollution bleaching technology in the paper pulp biomimetic pretreatment and belongs to the technical field of paper making. The process mainly comprises the following steps of: (1) carrying out metal salen biomimetic pretreatment to paper pulp bleaching, wherein metal salen, pyridine, H2O2 and O2 are used for carrying out bleaching pretreatment to oxygen-removal kraft pulp in alkaline condition; and (2) carrying out subsequent little-chlorine and little-pollution bleaching, wherein paper pulp after the biomimetic pretreatment undergoes three-section bleaching treatment, i.e., a chlorine dioxide bleaching section, a chelation treating section and a hydrogen peroxide bleaching section. The process is simple and easy to implement, has remarkable effect and can improve the whiteness and the property of the paper pulp. Compared with the conventional little-chlorine bleaching procedures, the bleaching process uses less chlorine. Compared with the conventional CEH bleaching, the bleaching process can reduce the time for pulping.

The present invention relates to a paper-making pulping method by using kenaf aggregates. Concretely, the present invention provides a paper-making pulping method by using kenaf aggregates which comprises the following steps: (a) soaking the kenaf aggregates in water or an aqueous solvent at a temperature of 70-100 DEG C for 5-180 min, cooling the soaked kenaf aggregates to the temperature of 5-50 DEG C, and pulverizing to obtain the pulverized kenaf aggregates; (b) soaking the kenaf aggregates obtained through step (a) at a temperature of 70-90 DEG C for 60-300 min with the presence of 2.0-7.0 wt% of sodium hydroxide, 2.0-5.0 wt% of hydrogen peroxide, 0.05-3.0 wt% of sodium silicate, and 0.05-2.0 wt% of magnesium sulfate; (c) performing the refining and latency procedure to the chemically treated pulp so as to obtain kenaf aggregate paper pulp.

The invention relates to a fiber and filler mixed enzymatic defibrination method which comprises the steps of high concentration and low concentration series beating, paste and filler premixed beating, and paste and beating enzyme premixed beating. Firstly, pre-treating fibers by beating enzyme, so as to enable the fibers to be soft and convenient to beat; secondly, adding fillers when concentrating the paste into a higher concentration through a press master; and conducting beating through a high consistency refiner. According to the method provided by the invention, fiber intensity is improved through three modes, tensile strength, bursting strength, folding endurance and cohesion of paper can be efficiently improved; identical paper strength can be maintained under the condition of improving 2 percent to 3 percent of paper ash, furthermore, beating energy consumption can be greatly decreased under the action of beating enzyme. Through the application of the method in a paper mill, macrofiber usage can be decreased, paper ash part can be improved, cost of a ton of paper can be greatly decreased, and product competitiveness can be improved.

The invention discloses a white paperboard and a method for manufacturing the same. The white paperboard comprises, by weight, 85-95 parts of mixed fibers, 6-8 parts of persimmon peel extract and 15-22 parts of semi-chemical pulp. The mixed fibers include mango tree fibers and bamboo fibers, a mass ratio of the mango tree fibers to the bamboo fibers is 15-16:2-3, the lengths of the mango tree fibers are 0.85 mm, and the widths of the mango tree fibers are 0.02 mm. The white paper board and the method have the advantages that the shortcoming of existing white paperboards in the aspect of elasticity can be overcome by the aid of the white paperboard with a low formaldehyde content, the white paperboard is difficult to fluff and high in smoothness, and printing ink is easy to attach onto the white paperboard.

The invention discloses a preparation method of polyester/para-position/meta-position aramid composite electric insulating paper. The preparation method specifically comprises the following steps: pre-treating PET (Polyethylene Terephthalate) chopped fibers for later use; pre-treating PPTA (Poly(p-phenylene terephthalamide)) chopped fibers; mixing the pre-treated PET chopped fibers and the pre-treated PPTA chopped fibers and carrying out first time of defibering in a defibering machine; then, adding PMIA (Poly(m-phenyleneisophthalamide)) pulp fibers and carrying out second time of defibering; finally, adding a dispersant and carrying out third time of defibering to obtain suspending liquid; injecting the obtained suspending liquid into a paper molding device and dehydrating and molding; squeezing and drying to obtain aramid composite paper raw paper; and carrying out hot press molding on the aramid composite paper raw paper to obtain the aramid composite paper. According to the preparation method of the aramid composite paper, disclosed by the invention, the high-strength property of the chopped fibers can be utilized to the greatest extent and polyester fibers have a relatively low softening temprature so that the strength property and the dielectric property of the aramid paper are improved.

The invention discloses a method for improve strength of waste paper fiber by constructing nano-polyelectrolyte multilayer films. In the method, a nanoscale polyelectrolyte multilayer film structure is formed on the surface of regenerated fiber by means of electrostatic layer-by-layer self-assembly of anionic and cationic polyelectrolyte on the surface of the waste paper fiber. The method has thebeneficial effects that by changing consumption of the polyelectrolyte, regulating and controlling the electrolyte multilayer film structure and adjusting the pH value of an electrostatic layer-by-layer self-assembly environmental system, the polyelectrolyte multilayer films with different properties can be obtained on the surface of the regenerated fiber so as to increase fiber bonding quantity;electrostatic attraction between anions and cations is taken as a film-forming driving force to prepare the ordered lamellar self-assembled multilayer ultra-thin films by means of alternate deposition of monomolecular layers in opposite ionic systems, and the preparation process has the advantages of simple conditions and strong adaptability and can realize surface modification of the waste paperfiber reused for a plurality of times; and strength of the finished paper prepared from the waste paper fiber after electrostatic layer-by-layer self-assembly modification is obviously enhanced, and drainage property of paper pulp is obviously improved.

Leather waste in leather solid-waste is washed, defatted by an ordinary degreasing agent then put and crushed in a pulping machine to be diluted with water hydrolyzed, and dispersed with homogenizer to small particles after adding MgO to get collagen fiber pulp. Soft wood or broad-leaved wood pulp plate is soaked and dispersed in a beater and ground to 35 deg. SR-40 deg SR beat degree to get wood pulp. 5%-10% total mass percentage of the collagen fiber pulp is mixed with the wood pulp according to bone-dry pulp to be formed by hand an a Kayser paper formation device, squeezed with a press and dried in vacuum under 70 deg.C-105 deg.C to get paper.

The invention relates to the technical field of wrapping paper processing, and discloses a method of improving the performance of recycled paper pulp. Waste and old corrugated paper is taken as the main raw pulp accounting for 70 to 80% of recycled paper pulp; the residue is mixed recycled paper pulp of other materials; 1.0 to 1.5 wt% of nano cellulose fibrous organic pulp is added into the recycled paper pulp, cellulose rich in crop straws is used to prepare nano fiber filaments, the tensile index and burst index are increased, the performance of paper prepared from waste paper pulp is improved, and the utilization rate of waste and old resources is increased.

The invention provides a chlorine dioxide bleach method for reducing the content of organic chlorine in effluent. The method is a technology of reducing the content of organic chlorine in element free chlorine (ECF) bleaching effluent and improving the performance of a bleaching pulp, belongs to the papermaking technical field and mainly comprises the following steps of: 1) adding aminosulfonic acid or DMSO addition agent under an appropriate chlorine dioxide bleach technique; 2) bleaching wood pulp and bleaching deoxidation sulfate wood pulp in the presence of NaOH, CIO2 and the addition agent; 3) conducting subsequent totally chlorine-free (TCF) wood pulp bleach and then conducting subsequent two-stage bleach ( a chelated treatment stage and a hydrogen bleach stage) treatment on the bleached wood pulp. The method is easy to operate, has obvious effect, can reduce the content of organic chlorine in DQP bleaching effluent and improve the performance criterions of DQP bleaching paper pulp such as whiteness and tensile index, etc.

The invention discloses a non-wood unbleached pulp food wrap paper and a preparation method thereof. Slurry of the non-wood unbleached pulp food wrap paper is prepared from unbleached straw pulp and unbleached bamboo pulp, the fixed quantity of the wrap paper ranges from 45 g/m<2> to 65 g/m<2>, and the content of synthetic papermaking additives accounts for 0.5%-2.5% of oven dry stock. The wrap paper is safe and environmentally friendly, the natural color of plant fiber is kept, dust and chips do not exist, no hazardous substance is produced in a papermaking technology, the waste water treatment cost is lowered, and the production cost is low.

The invention discloses a preparation method of high-breakage-resistance kraft paper, which comprises the following steps: fiber raw materials are subjected to mixing and disintegrating, desanding, high-concentration pulping, low-concentration pulping, net forming, squeezing and drying, wherein the concentration of the high-concentration pulping is 30-35%, the concentration of the low-concentration pulping is 4.8-6%, and the concentration of net forming is 0.15-0.25%. The kraft paper with good water absorption, high longitudinal tear index, high burst index and high tensile index can be prepared through the preparation method, indexes of the kraft paper are far away from those of common kraft paper in supermarkets, and the preparation method is suitable for papermaking of the kraft paper with low gram weight of 40g/m < 2 >-140g/m < 2 > and is simple in preparation process.

The invention discloses a paper pulp preparation method which comprises the following steps: Step one, obtaining cellulose, preparing fiber pulp, adjusting the water content of the obtained fiber pulpto 50-70 wt%; and Step two, adding excess acetic anhydride into the fiber pulp according to the water content for hydrolysis reaction under the conditions of the temperature not higher than 70 DE C;adjusting the mass ratio of cellulose, acetic anhydride and acetic acid in the hydrolysis system to 1: (2-3): (8-12) for esterification reaction under the conditions of the temperature higher than 80DEG C. The water-containing fiber pulp can be directly taken as an object of treatment, the cellulose is modified with the acetic anhydride in a water phase without adding of other chemical aids, andan acetyl group is moderately introduced to reduce chemical pulp crystallinity, increase water retention value, increase layer-to-layer bond strength and improve long resistance index, and the effectis still good after many times of use.

The invention provides a guar gum-boric acid surface-crosslinking modified precipitated calcium carbonate. Guar gum is crosslinked on the surface of the modified precipitated calcium carbonate through boric acid. The invention aims to provide a modified precipitated calcium carbonate which can obviously enhance the tensile index, burst index and tear index of paper and the single-pass retention rate of the filler when being used in the filler of the paper. The invention also provides a preparation method and application of the modified precipitated calcium carbonate. Besides, the invention also provides a paper containing the modified precipitated calcium carbonate.

The invention provides corona-resistant aramid fiber/mica insulation paper and a preparation method of the corona-resistant aramid fiber/mica insulation paper. The preparation method comprises the following steps: 1, defibering aramid chopped fibers, polyoxyethylene and water, and then adding aramid fibrid for defibering to obtain first slurry; 2, muscovite slices are added into the first slurry for defibering, second slurry is obtained, and the total mass ratio of the aramid chopped fibers, the aramid fibrids and the muscovite slices in the second slurry is 0.04%-0.07%; and step 3, sequentially performing dehydration forming, squeezing, drying and hot pressing on the second slurry to obtain the aramid fiber/mica insulation paper. The high-temperature-resistant and corona-resistant white mica sheets are added into the manufacturing process of the aramid paper, so that the corona resistance of the aramid paper is greatly improved, the problem that the aramid paper is easy to age due to repeated electric shock under high temperature and high pressure is solved, and the application requirement of equipment for long insulation life cycle is met.

The invention discloses a waste corrugated board white water treatment method. The method comprises the following steps: adjusting pH of waste corrugated board white water to be 4-6, adding a certain amount of FeSO4 and H2O2 in a stirring state, and carrying out aeration, flocculation and filtering so as to complete the white water process, wherein the concentrations of FeSO4 and H2O2 in the white water is 350-450 mg/L and 180-240 mg/Lm respectively and the reaction time is 30 min. Since white water is treated through the method, the DCS content, COD and chromaticity of the waste corrugated board white water are obviously reduced, and the white water can be reused for preparation of waste corrugated board slurry; in addition, the tensile index, bursting strength, tear resistance and other properties of the waste slurry are improved.