36results about How to "Improve paper performance" patented technology

The invention discloses a preparation method of regenerated aramid composite paper. The preparation method includes: pretreating para-aramid chopped fiber, para-aramid pulp fiber and meta-aramid pulpfiber, mixing, loosening to form a uniform fiber/aqueous suspension, adding a papermaking aid into the suspension, dewatering, and molding to obtain composite aramid raw paper; dissolving the meta-aramid fiber by using organic solvent/inorganic salt solution to obtain an aramid solution, dropwise adding the prepared aramid solution into the structure of the aramid composite raw paper, putting thearamid composite raw paper into the air for regeneration, after the regeneration is completed, hot pressing the paper a high temperature and high pressure, and cleaning residual organic solvent and inorganic salt by using water to obtain high-strength aramid composite paper. The quantity of the high-strength aramid composite paper is 20 to 200 g/m2, the thickness is 10 to 300 micrometers, the mechanical strength is greatly improved, and the tensile strength is improved by 20 times.

The invention discloses control agent of dissolved and colloidal substances (DCS) in paper machine circulating off-machine water and a use method thereof. The control agent is prepared by mixing the polymeric aluminium and cationic polymer, wherein the mass ratio of the polymeric aluminium to the cationic polymer is 87-99%:1-13%; the cationic polymer is one or the mixture of some types of polyamine, cationic polyacrylamide and polyvinyl amidine; and control agent is added into the paper machine short circulation off-machine water or paper stock under flow, the use level of polymeric aluminium is 100ppm-300ppm and the use level of cationic polymer is 3ppm-15ppm. The invention greatly reduces the DCS content in the paper machine circulating off-machine water, ensures that the DCS content in the circulating off-machine water is controlled below 900mg/L, improves the sealing and circulating degree of the off-machine water, reduces water consumption of paper, and simultaneously improves the performances of paper stock reservation and paper machine operation and the performance of paper.

The invention belongs to the field of papermaking technologies and materials, and particularly relates to para-aramid nanofiber/high-performance carbon fiber composite paper and a preparation method thereof. By utilizing the characteristics of a large specific surface area, easy dispersion in an aqueous solution and the like of para-aramid nanofibers, the para-aramid nanofibers can replace a traditional wet strength agent and an adhesive for pulp; the para-aramid nanofibers can be fully and uniformly mixed with a high-performance carbon fiber solution, and a wet paper sheet of para-aramid and carbon fibers is prepared through wet papermaking; then a para-aramid nanofiber dispersion liquid is subjected to spraying and sizing on the surface of the aramid wet paper sheet; then compounding, drying and forming are conducted; and thus, the sprayed and compounded paper sheet can remarkably improve the uniformity and mechanical strength of the composite paper, improve the production efficiency of a composite paper-based material and the like, and can fully realize the compounding of the carbon fibers and the aramid fibers. A composite material prepared by using the method has good heat resistance and chemical stability and excellent heat conduction and electric conduction performance.

The invention relates to synthetic fiber paper for a highly heat-resistant circuit board with negative thermal expansion coefficient and a preparation method and application. The synthetic fiber paper is prepared from the following components in percentage by weight: 10-90% of structural fiber and the balance of viscose fibers, wherein the viscose fibers are fibers with negative thermal expansion coefficient and are selected from poly-p-phenylene terephthamide precipitation fibers and/or poly (p-phenylene terephthalamide) pulp. The preparation method comprises the following steps: preparing the structural fibers and viscose fibers into papermaking pulp; papermaking and moulding by a wet process; and hot-rolling and calendering to prepare the synthetic fiber paper. X-Y axis thermal expansion coefficient (CTE) in a plane of the synthetic fiber paper is negative and can offset CTE of thermosetting resin in a substrate of a printed circuit board, so that the printed circuit board is relatively stable and reliable, and the synthetic fiber paper can be applied to preparing a reinforcing material of the substrate of the printed circuit board.

A twin fabric hybrid forming section for paper making machine is described in which: the pitch of the fabric support elements decreases progressively in the machine direction; the level of vacuum applied to the forming fabrics through the dewatering boxes increases in the machine direction; the two forming fabrics together with the stock sandwiched between them traverse at least four separate and distinct vacuum zones within the forming section as they proceed in the machine direction; the level of vacuum applied to the last of the at least four separate and distinct vacuum zones is higher than the level of vacuum applied to the first of the separate and distinct vacuum zones; the level of vacuum applied to the at least four separate and distinct vacuum zones follows a preselected profile; and the dewatering boxes carrying the fabric support elements are arranged so that the fabric support elements are located in an alternating sequence on the machine sides of both of the forming fabrics.

The embodiment of the invention provides a papermaking method of bamboo pulp household paper. The papermaking method comprises the following steps: taking bamboo pulp as main pulp, dividing a slurry into a slurry A and a slurry B; separating the slurry A and the slurry B; mixing the separated slurries to form a first mixed slurry and a second mixed slurry; grinding the second mixed pulp; adoptingthe first mixed pulp and the ground second mixed pulp for papermaking in a papermaking machine; wherein the papermaking machine is a crescent-shaped papermaking machine; slurry distribution and grading treatment are adopted, so that the distribution and proportion of fibers with different lengths in the bamboo pulp can be adjusted; on one hand, energy consumption can be reduced, and the efficiencyof softeners and wet strength agents is improved; on the other hand, after distribution and proportion of fibers with different lengths in the bamboo pulp are adjusted, the pulp has better forming performance, the papermaking requirement of a crescent-shaped papermaking machine is met, meanwhile, the paper forming performance of paper is improved, and the invention further provides the householdpaper manufactured through the bamboo pulp household paper papermaking method.

The invention discloses a starch adhesive. The starch adhesive is prepared from raw materials in parts by weight as follows: 40-50 parts of corn starch, 8-10 parts of borax, 10-12 parts of water, 6-8 parts of solid sodium hydroxide, 5-7 parts of pressure-sensitive adhesive composition, 6-10 parts of polypropylene glycol, 6-8 parts of polyol, 5-7 parts of potassium pyroantimonate and 1-2 parts of a synergist. The starch adhesive has the characteristics that surface strength of finished paper is excellent, linting and dusting trend is reduced obviously and the usage amount of latex is reduced.

The invention discloses a method for synergistic treatment to improve the effect of oxygen-alkali pulping and belongs to the technical field of pulping and papermaking. The method comprises: pretreating raw materials through hot water at 30-60 DEG C, carrying out screw extrusion according to a compression ratio of 1: 1.5 to 1: 4, feeding the extruded materials into a digester, and adding a free radical controlling agent into the digester in digestion so that the oxygen-alkali pulping effect is improved. Compared with the conventional oxygen-alkali pulping method, the method utilizes combination of hot water pretreatment, spiral extrusion conveying and a free radical control agent to improve a fine pulp yield of oxygen-alkali pulping by 4-7%, reduce a Kappa number by 2.1 to 3.4 and improvewhiteness by 4% ISO to 6% ISO.

Provided are a rubber composition capable of imparting a high tensile strength to a roller main body so as to be able to be used for equipment that allows paper to pass through at high speed, while maintaining high abrasion resistance of the roller main body and a favorable paper feeding performance of the paper feeding roller; and a paper feeding roller. There is provided a rubber composition contains: a rubber that includes a non-oil extended EPDM having an ethylene content of 55 to 72%; and more than 20 parts by mass and 30 parts by mass or less of a filler, and 2.5 parts by mass or more of a peroxide crosslinking agent per 100 parts by mass of the rubber, in which the filler contains 15 to 30 parts by mass of an amorphous silica per 100 parts by mass of the rubber.

The present disclosure relates to an aramid paper for a honeycomb, which is prepared by mixing, with an aramid floc, an aramid pulp having a fiber length equal to or longer than a predetermined length and a fibril development equal to or higher than a predetermined level, at a predetermined ratio, a wholly aromatic aramid paper for an electrical insulation paper having superior paper formation property and thus having uniform electrical insulation property, which is prepared by mixing an aramid pulp having a fines content equal to or higher than a predetermined ratio at a predetermined ratio, a laminated aramid paper having a uniform thermal expansion coefficient, uniform electrical conductivity and uniform thermal conductivity, which is prepared by laminating an aramid paper with superior paper formation property on an aramid paper with superior paper strength by calendering, and a method for preparing the same. The aramid paper according to the present disclosure is applicable to a material or a component which requires precision with little difference in physical properties such as a thermal expansion coefficient, electrical conductivity and thermal conductivity. Specifically, it is applicable to a honeycomb, an electrical insulation paper, a PCB substrate, etc. because it has superior paper strength and paper formation property. Moreover, the method for preparing an aramid paper can solve the problems of poor transfer of a base paper, nonuniformity of strength and aggregation between flocs.

The invention discloses a method for optimizing a paper structure to improve the performance of finished paper. The method comprises the steps of size degradation of paper pulp, defibrination, preparation of filler suspension liquid and manufacturing of paper with the pulp, wherein when the paper is manufactured with the pulp, three paper layers are combined for manufacturing, and the concentration factor Fc of filler in the paper is regulated to achieve improvement on bulk, air permeability, physical strength and optical performance of the filled paper when the content of the filler is fixed. The distribution factor of the filler is optimized to improve the performance of the finished paper, distribution of the filler in the paper structure is adjusted to play the advantages of the filler to the maximum extent, and the purpose of improving the performance of the finished paper is achieved. The method is simple and easy to operate, the performance of the target finished paper is adjusted according to needs, the performance of the finished paper is improved in a modern paper making machine by optimizing the concentration factor and adjusting the distribution of the filler, and therefore the quality of the finished paper is improved.

A twin fabric gap former forming section (1) for paper making machine is described in which: the pitch of the fabric support elements (26, 27, 28) decreases progressively in the machine direction; the level of vacuum applied to the forming fabrics (2, 4) through the dewatering boxes (11, 12, 13, 14), increases in the machine direction; the two forming fabrics (2, 4) together with the stock (7) sandwiched between them traverse at least four separate and distinct vacuum zones (24, 19, 20, 21, 22, 23) within the forming section as they proceed in the machine direction; the level of vacuum applied to the last of the at least four separate and distinct vacuum zones is higher than the level of vacuum applied to the first of the separate and distinct vacuum zones; the level of vacuum applied to the at least four separate and distinct vacuum zones follows a pre-selected profile; and the dewatering boxes (11, 12, 13) and (14) carrying the fabric support elements (26, 27, 28) are arranged so that the fabric support elements (26, 27, 28) are located in an alternating sequence on the machine sides of both of the forming fabrics (2, 4).

Disclosed is a paper folding apparatus for a binding machine, capable of discharging paper sheets by folding the paper sheets twice. The paper folding apparatus includes a first knife unit and a second knife unit. The first knife unit has a first feeding path and a pair of first paper folding rollers. The second knife unit has a second feeding path and a pair of second paper folding rollers. A paper arranging guide is installed in front of the pair of first paper folding rollers, and the second knife unit includes a pinion, a rack selectively engaged with the pinion, a rack guide configured to provide a path on which the rack is moved, a resilient member resiliently supporting the rack, and a second paper folding knife configured to move back and forth between the second paper folding rollers in association with a moving direction of the rack.

The invention relates to the field of article storing, in particular to a paper file storing method and a sealing file bag thereof. The storing method comprises the following steps that S30, packagingbags with different materials are selected according to different sealing grades, a paper file is arranged in a file box, and the file box is arranged in one packaging bag; S40, vacuum pumping treatment is carried out on the packaging bag; S50, carbon dioxide filling treatment is carried out on the packaging bag; and S60, sealing treatment is carried out the packaging bag. The invention further relates to the sealing file bag for the paper file storing method. According to the paper file storing method, the paper files can be stored for a long time, and the method enables the paper file to maintain good paper performance for a long time.