94results about How to "Increased burst index" patented technology

The invention discloses a composite paper and a production method thereof. The production method comprises the following steps: mixing raw wood pulp, barks, hemp, straws, glass fibers, an inorganic filler and limewater according to a weight ratio of 100:(20-30):(1-5):(2-5):(5-15):(15-25):(200-300), and boiling the obtained mixture to prepare a paper pulp; and washing, bleaching and beating the paper pulp, picking up paper, and squeezing and baking the paper to obtain the composite paper. In the invention, the raw wood pulp, barks, hemp, straws, glass fibers, an inorganic filler and limewater are mixed according to a specific ratio, and are boiled to prepare the paper pulp; and the inorganic filler added into the raw materials of the paper in the production method improves the strength of the produce paper and increases the burst index of the paper.

The invention discloses a preparation method of an abrasion-resistant paper-plastic composite bag. The preparation method includes the steps that 1, polyethylene resin, phenolic resin, polyurethane, glycerol, hydrotalcite, molybdenum disulfide, tricresyl phosphate and calcium stearate are mixed, are subjected to heat treatment and then are subjected to extrusion molding to obtain plastic particles; 2, the plastic particles are heated and applied to the surface of a paper layer to form a plastic covering layer so as to prepare abrasion-resistant paper-plastic composite paper; 3, the paper-plastic composite paper is processed into the abrasion-resistant paper-plastic composite bag. The abrasion-resistant paper-plastic composite bag prepared by means of the method has high burst index and high mechanical strength, the raw materials are easy to obtain, and quantitative production can be achieved.

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 provides a modified starch composition used in the paper-making field. The modified starch composition comprises reaction products by mixing guar gum, an etherified modified compound of starch, a metal silicate and water, wherein the etherified modified compound of starch is an etherified modified compound of original starch and a cationic etherifying agent pre-activated by an alkaline catalyst, the mass of the cationic etherifying agent in the cationic etherifying agent pre-activated by the alkaline catalyst is 5%-15% of the total dry mass of the original starch and the guar gum, the mass of the alkaline catalyst is 1.0%-2.0% of the total dry mass of the original starch and the guar gum; the dry mass of the guar gum is 1.0%-3.0% of the dry mass of the original starch, and the dry mass of the metal silicate is 10%-30% of the total dry mass of the original starch and the guar gum. The invention also provides a preparation method of the modified starch composition and pulp using the modified starch composition. The modified starch composition can effectively improve the retention and drainage properties of the pulp.

The invention discloses a preparation method of moisture-resistant food bags. The preparation method includes: 1) mixing polyethylene resin, phenolic resin, polyurethane, glass fibers, hydrotalcite, tricresyl phosphate and calcium stearate, and performing thermal treatment and extrusion molding to obtain plastic particles; 2) heating the plastic particles, and coating to the surface of a paper layer to form a plastic coating to obtain paper-plastic composite paper; 3) processing the paper-plastic composite paper into the moisture-resistant food bags. The moisture-resistant food bags made according to the method are excellent in moisture resistance, capable of preventing moisture deterioration of food in the bags and high in burst index.

The invention discloses a preparation technology for a kraft liner box board. The technology comprises the following steps of 1 pulping, 2 papermaking and 3 sizing. By adopting graded bottom layer slurry, core layer slurry and surface layer slurry, waste paper slurry is sufficiently utilized, and meanwhile the strength and brightness of formed paper are ensured; a filler is added into the bottom layer slurry, the strength of the bottom layer slurry is ensured, and a dry strength agent is added into the surface layer slurry, so that the formed paper tenacity is improved.

The invention discloses a rapid-growth poplar sodium hydroxide anthraquinone pulp biochemical method TCF bleaching process. The process is characterized in that the process comprises the steps that: (1) steaming is carried out, wherein rapid-growth poplar wood sheets are steamed in a steaming pot, such that an original pulp is obtained; washing and screening are carried out, such that paper pulp is obtained; (2) xylanase pretreatment is carried out; (3) TCF bleaching is carried out, wherein the treated paper pulp is bleached with one of the bleaching sequence selected from OP-Q-P, O1-O2P-Q-P and O1P-O2P-Q-P. According to the invention, paper pulp is pretreated by using xylanase, and bleaching is carried out with one of the three bleaching sequences of XOPQP, XO1O2PQP and XO1PO2PQP, such that paper pulp with higher whiteness and viscosity are obtained. Compared with paper pulp obtained by direct bleaching without xylanase pretreatment, the paper pulp provided by the invention has lower beating whiteness loss. A folding resistance is higher by 30-49 times, a burst index is higher by 0.3-0.6N.m.g<-1>, a breaking length is higher by 0.15-0.36KM, and a tearing index is not significantly changed. When a same or similar beating degree is reached, needed beating revolutions are less, and beating energy consumption can be saved by approximately 17.8%.

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 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.

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 a method for preparing water-resistant high-strength functional paper, which comprises the following steps: dehydrating tetrahydrofuran (THF) by adding anhydrous calcium chloride (CaCl2) for 24 hours; filtering to obtain anhydrous THF; adding polyethylene glycol to 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate (also known as isophorone diisocyanate, IPDI for short) to obtain a mixture A; adding the mixture A to the anhydrous THF; then, adding dibutyltin dilaurate as a catalyst, heating to 60 to 62 DEG C, and evenly stirring to obtain a mixed solution; impregnating paper with the mixed solution, and drying to remove the excessive organic solvent; and further heating and curing the paper to obtain the water-resistant high-strength functional paper. The modification of the invention to the body paper leads to average increases in the breaking length by 4.38 times, the folding endurance by 28.73 times and the burst index by 6.73, average wet strength/dry strength of 51% and average reduction in the opacity to about 60% from the original.

The invention discloses a paper-plastic composite material and a preparation method thereof. The preparation method comprises the following steps: firstly, mixing raw wood pulp, bark, hemp, straws, glass fibers, an inorganic filler and whitewash according to the weight ratio of 100 to (20 to 30) to (1 to 5) to (2 to 5) to (5 to 15) to (15 to 25) to (200 to 300), and then cooking to prepare paper pulp; washing, blenching and knocking the paper pulp, fishing paper, drying and baking paper to obtain composite paper; secondly, heating a low-density polyethylene film and then coating the surface of the composite paper with the film to form a plastic layer, thus obtaining the paper-plastic composite material. The paper-plastic composite material has excellent mechanical strength and good antibacterial properties.