59results about How to "Increased tear index" patented technology

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 provides mixing pulp with a large tearing index, and the weight of the high strength straw pulp is 15-95 percent of that of the mixing pulp; the paper made of the mixing pulp, including the cultural paper, also improves a cultural paper containing non-bleached straw pulp and other pulp. Because the mixing pulp is added with the non-bleached straw pulp, the amount of wood pulp and the like is reduced, thus avoiding the environmental pollution caused by bleacher during the bleaching process in technology, and avoiding generating substance harmful to the human body; and the paper product made by the method of copying hardly contains the substance harmful to the human body, thus lowering the cost of the paper production, lowering the tearing index of the paper, and lowering the aging degree of whiteness, and the paper does not return to be yellow easily.

The invention provides a health care mat for infants and belongs to the technical field of textile processing. The health care mat for infants is of a three-layer double-side structure, a front side layer and a back side layer are both a simulation rattan mat body, and a middle health care layer is formed by evenly mixing and flattening 100 parts of Chinese herbal medicine and 5-40 parts of natural rubber cement by weight. The Chinese herbal medicine of the health care layer includes the following raw materials by weight: 1 part to 10 parts of bamboo charcoal, 1 part to 10 parts of jasmine flower, 20-35 parts of negundo chastetree fruit, 10-30 parts of semen cassiae, 10-30 parts of lavender and 10-20 parts of mint. The manufacturing method includes manufacturing the simulation rattan mat bodies, taking the Chinese herbal medicine according to the prescription, drying and breaking the Chinese herbal medicine, mixing the dried and broken Chinese herbal medicine with the natural rubber cement to obtain the health care layer, evenly coating the natural rubber cement on the bottom face of one simulation rattan mat body, laying the health care layer, then laying the other simulation rattan mat body and conducting clipping and edge wrapping to obtain a finished product of the health care mat for the infants. The health care mat is good in health care effect and low in cost.

The invention discloses a method for synthesizing quaternized gluten protein. Firstly, hypohalite is used to pretreat gluten protein. The mass ratio of gluten protein to hypohalite is 1:1-1:2. Convert the free amide groups on the gluten protein into fatty amino groups; then use cationic quaternary ammonium epoxy chloride with a mass ratio of 1:1 to 1:1.5 to carry out grafting reaction with the pretreated gluten protein to generate quaternary ammonium salts Cationic modified gluten protein. Through the pretreatment reaction of hypohalite, the content of fatty amino groups on the protein molecular chain can be increased, which is beneficial to the quaternization reaction, and the combination of protein and plant fiber can be improved; the solubility of gluten protein can be improved, and it is more suitable for plant fiber ( Pulp) for sizing.

The invention provides mixed pulp, which has high loose depth, high opacity and large tearing index. The primary color straw pulp accounts for 15 to 95 percent of the weight of the mixed pulp, the mixed pulp comprises one kind or the free combination of more than two kinds of materials of wood pulp, cotton pulp, bamboo pulp or secondary fiber, the loose depth of the primary color straw pulp is between 1.98 and 2.30 dm<3>/g, the opacity is between 89 and 99 percent, and the tearing index is between 3.5 and 6.0 mN*m<2>/g. The invention also provides cultural paper. The mixed pulp has high loosedepth, high opacity and large tearing index, a pulp material with low cost and simple pulp making process is mixed in the mixed pulp, and paper products made through the papermaking process have the characteristics of loose depth, high opacity, large tearing index of the paper products, soft color, simple and natural effect, simple manufacture process, low manufacture cost and the like.

The invention relates to mixed pulp with high opacity, air permeability and tearing index and paper with the mixed pulp. The air permeability of the high-efficient straw pulp is between 300 and 6500 ml/min, the opacity is between 88 to 100 percent, and the tearing index is between 3.5 and 6 mN*m<2>/g; preferably, the air permeability is between 500 and 5500 ml/min, the opacity is between 90 and 99 percent, and the tearing index is between 4.6 and 5.6 mN*m<2>/g; more preferably, the air permeability is between 1000 and 5000 ml/min, the opacity is between 94 and 98 percent, and the tearing index is between 4.8 and 5.4 mN*m<2>/g. The mixed pulp provided by the invention has high opacity, air permeability and tearing index, so the opacity of the paper with the mixed pulp is improved, and the stiffness and the like of the paper are improved. Because of the improvement of the air permeability, the papermaking speed is greatly improved.

The invention relates to mixed pulp with high bulk, air permeability and tear index and cultural paper made thereof. The air permeability of the novel straw pulp is 300-6500ml/min, the bulk is 2-3cm<3>/g and the tear index is 3.5-6mN.m<2>/g. Preferably, the air permeability is 500-5500ml/min, the bulk is 2.3-2.8cm<3>/g and the tear index is 4.6-5.6mN.m<2>/g. More preferably, the air permeability is 1000-5000ml/min, the bulk is 2.4-2.6cm<3>/g and the tear index is 4.8-5.4mN.m<2>/g. Since the bulk, the tear index and the air permeability of the mixed pulp provided by the invention are high, the bulk and the opacity of the paper made of the mixed pulp are improved, the stiffness and the like of the paper are increased, and the papermaking speed is greatly improved because the air permeability is improved.

The invention discloses a printing paper preparation method with moisture-proof function, which comprises the following steps: step 1, starch is dispersed into water to prepare a printing paper with aconcentration of 30 40% slurry, follow by 0.01 0.04% starch branching enzyme, raising the temperature to 35 45. Degree. C., reaction 15. Degree. C 25 min, and then adde concentrated sulfuric acidto that mixture for reaction 4 6 min, and then adde that polyvinyl alcohol, and stirring the mixture continuously for 12 16min, cool to room temperature, standby. The purpose of the invention is toprovide a method for preparing printing paper with moisture-proof function. Compared with the prior art, the printing paper has good moisture-proof effect, high use value and good application prospect.

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 discloses a method for preparing a paper-based material from a biochemical technology ECF bleached sulfate pulp of fast-growing poplar. The method comprises the following steps: 1, preparing a paper pulp through a biochemical technology ECF bleaching technology of sulfate pulp of the fast-growing poplar; and 2, carrying out gradient beating on the prepared paper pulp to obtain paper pulp with three beating degrees, wherein the beating degree of first paper pulp is 10-30 DEG SR, the beating degree of second paper pulp is 30-55 DEG SR, and the beating degree of third paper pulp is 55-70 DEG SR; and 3, carrying out making molding or compaction molding on the mixed pulp to obtain the paper-based material. The method adopting a gradient beating technology and a self-adding technology solves the disadvantages of single beating technologies in the prior art, and avoids use of extra additives, and the produced paper-based material has the advantages of high folding strength, high bursting strength and high tearing resistance index, is suitable for producing various types of paper bases, and is especially for producing white cardboard raw paper-based materials.

The invention relates to a method for improving mechanical properties and hydrophobic and oleophobic properties of aramid insulating paper. Para-position aramid fibers are added in a papermaking process of meta-position aramid insulating paper. Compared with meta-position aramid fibers, the para-position aramid fibers have better mechanical properties, so that the mechanical properties of the meta-position aramid insulating paper are further improved. The aramid insulating paper is modified by utilizing fluorine gas; after modification, a new group is introduced into the surface of the aramidinsulating paper so that the contact angle of the surface of the aramid insulating paper is enlarged and the hydrophobic and oleophobic properties of the aramid insulating paper are increased. A high-temperature soft calendering method is utilized so that the structure of the aramid insulating paper is not damaged and the crystallization degree of the aramid fibers can be greatly improved; meanwhile, the acting force between aramid cellulose chains is enhanced through a hot pressing manner, the combination is tighter and the linear density is increased; the tearing index and the tensile indexof the aramid insulating paper are greatly improved. The preparation method of the aramid insulating paper, provided by the invention, has the characteristics of simple technology, practicability andthe like.

The invention discloses a method of preparing papermaking enhancer from waste paper, which includes the steps of: shearing waste paper into small chips and performing deinking treatment; processing the paper chips into nano-cellulose with concentrated sulfuric acid; modifying the nano-cellulose with 2,3-epoxypropyltrimethylammonium chloride to obtain cation nano-cellulose; finally mixing and grinding the cation nano-cellulose, chitosan and a surfactant to prepare an enhancer. In the invention, the nano-cellulose is small in diameter and can fill the gap between fibers; meanwhile, the nano-cellulose is rich in hydroxyl groups, which can be combined with hydroxyl groups on the surface of cellulose to form a hydrogen bond, thus enhancing combining force between the fibers, and further improving tensile index, burst index, tearing index and elongation rate of paper.

The invention provides high-strength hardwood pulp and a preparation method thereof. Raw material wood of the hardwood pulp comprises the following raw materials in percentage by mass: 70-90% of bluegum and 10-30% of acacia mangium. According to the high-strength hardwood pulp and the preparation method thereof, the blue gum and the acacia mangium are combined, a ratio of the blue gum to the acacia mangium is optimized, a tensile index, a tearing index and a burst index of the prepared hardwood pulp are greatly improved, and the hardwood pulp performance is significantly optimized, exceeds those of domestic conventional wood chip pulp, is above superior product standards in bleached hardwood pulp industry standards and is better than those of imported high-quality high-strength wood pulp.

The invention relates to a paper cushion package. The paper cushion package is formed by stretching kraft paper on which tearing lines or cutting marks are distributed; the tearing lines or the cutting marks are distributed in a matrix manner, two adjacent columns of longitudinal tearing lines or cutting marks are staggered, the kraft paper is stretched, the tearing lines or the cutting marks are torn to form rhombic meshes, and four edges of all the rhombic meshes are twisted under stretching to form a corrugated shape, a honeycomb shape, a grid shape or a network shape; and the two adjacent rows of tearing lines or cutting marks are staggered by 1/2 length of the tearing lines or cutting marks. The manufacturing process of the kraft paper is further optimized, the montmorillonite is added, and the montmorillonite is fully dispersed and interwoven with the plant fibers to form a stable three-dimensional network structure with high bonding strength, so that the toughness of the kraft paper is improved, and the buffering performance of the buffering package made of the kraft paper is better.

The invention relates to a low-temperature replacement cooking method of bamboo kraft pulp. The method comprises the steps of bamboo chip cutting, screening, re-crushing, washing, water filtering, weighing and calculating, presoaking and charging, warm liquid filling, hot liquid filling, heating and cooking, cold blowing, material taking and the like. A bamboo chip screening device used in the screening step comprises a pair of overturning units, a pair of screening tray conveying units and a receiving unit. The sieve tray conveying units are arranged between the two overturning units, and the receiving unit is arranged between the two sieve tray conveying units. The method is easy to operate and high in product yield, the prepared kraft pulp is low in content of unsteamed products, low in kappa number, good in uniformity, high in strength, high in intrinsic viscosity, high in burst index, high in tensile index, high in tear index, high in mitt folding strength, low in steam unit consumption and low in alkali unit consumption, and the bamboo kraft pulp produced through the method is high in quality and can replace needlebush kraft pulp. The bamboo chip screening device can fully screen out bamboo powder smaller than the preset aperture of the screening tray, and the working efficiency is improved.