108results about "Defoamers addition" patented technology

The invention relates to the field of packaging materials, and discloses low-temperature heat-sealing water-based coated paper and a preparation method and application thereof.The water-based coated paper comprises a base paper layer and a water-based coating, and the water-based coating comprises water-based ethylene-acrylic acid copolymer emulsion, modified nano-silica, a coalescing agent and water; a cardanol derivative is introduced into the water-based ethylene-acrylic acid copolymer emulsion as a functional component; the cardanol derivative is prepared by reacting epoxidized cardanol with 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and then grafting with acryloyl chloride. The preparation method comprises the following steps: reacting epoxidized cardanol with 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide; the modified nano silicon dioxide is prepared by mixing aminated nano silicon dioxide and chitosan and adding a cross-linking agent prepared by grafting phytic acid and ethylene glycol diglycidyl ether. The water-based coating paper prepared by the invention overcomes the defects that the existing BOPP film is not environment-friendly, and the conventional coating paper is high in heat sealing temperature and easy to stick; meanwhile, good mechanical properties, water resistance and flame retardance are achieved.

The present invention relates to the technical field of decorative paper, and in particular to wood-based panel surface decorative paper, comprising print base paper and an adhesive film layer covering the surface of the print base paper. The adhesive film layer is made of impregnation glue liquid. The impregnation glue liquid comprises the following raw materials in parts by weight: 75-85 parts of modified polyurethane emulsion, 5-9 parts of an epoxy resin, 6-10 parts of a filler, 4-7 parts of nanocellulose, 2-3 parts of a silane coupling agent, 1.5-2.5 parts of a film-forming auxiliary agent, 0.2-0.3 parts of a defoaming agent, and 20-30 parts of water. The wood-based panel surface decorative paper comprises print base paper and an adhesive film layer covering the surface of the print base paper; the adhesion between the adhesive film layer and the print base paper is good; and the wood-based panel surface decorative paper has good wear resistance, good water vapor resistance, good cold and hot cycle resistance, and other properties, can reduce formaldehyde emission and is environmentally friendly.

The invention discloses a mineral-based easily-recyclable compostable water-based barrier coating and a preparation method thereof, and belongs to the technical field of paper-based packaging materials. The coating takes water as a carrier, and is composed of a biodegradable film forming system and a designed graded lamellar mineral system composed of three minerals with different sizes and morphologies. The mineral system comprises flaky kaolin with specific morphology and size, non-asbestos grade flaky talc and fully stripped sodium montmorillonite. A mineral sheet layer forms a compact parallel spreading barrier path in a coating through a specific coating and drying curing process, and excellent water vapor and oxygen barrier, water resistance and oil resistance are realized under the low dry weight of 8-15g / m by combining with a pH value response type reversible cross-linking system. The coating system does not contain polyvinylidene chloride and perfluoroalkyl and polyfluoroalkyl substances. The paper-based material coated with the coating is easy to defibrillate and recover under the standard alkaline warm water condition, the fiber recovery rate is high, and meanwhile, the whole material meets the industrial composting requirement.

The invention discloses paper pulp, a paper pulp board, a preparation method and application. The paper pulp provided by the invention comprises the following components in parts by weight: 15-50 parts of wood pulp, 10-30 parts of recycled paper pulp, 10-40 parts of barley straw fibers, 2.5-40 parts of vinasse fibers, 3-8 parts of a negative oxygen ion exciting agent, 0.5-8 parts of an adhesive, 0.5-4 parts of a sizing agent and 0-1 part of an additive. According to the provided paper pulp, waste of the wine making industry chain is fully utilized, barley straw fibers, vinasse fibers, wood pulp, recycled paper pulp, the negative oxygen ion exciting agent and the like are combined, the obtained paper pulp fiber is high in strength, and a carton finished product is high in compressive strength and free of peculiar smell. The paper pulp for preparing cartons with excellent performance is provided while the recycling of wastes of a wine brewing industry chain is realized.

The application discloses a mineral-based easily-recyclable compostable water-barrier coating and a preparation method thereof, and belongs to the technical field of paper-based packaging materials. The coating is formed by a biodegradable film-forming system and a hierarchical lamellar mineral system containing three different scales and morphologies. The mineral system contains specific morphology and size of lamellar kaolin, non-asbestos grade lamellar talc and fully exfoliated sodium montmorillonite. The mineral lamella forms a dense parallel spread barrier path in the coating through a specific coating and drying solidification process, and combines a pH value responsive reversible cross-linking system to achieve excellent water vapor and oxygen barrier properties, water resistance and oil resistance at a low dry weight of 8-15 g / m2. The coating system does not contain polyvinylidene chloride and perfluoro and polyfluoro alkyl substances. The paper-based material coated with the coating is easily defibered and recycled under standard alkaline warm water conditions, and the fiber recovery rate is high, and meanwhile, the whole material meets the industrial composting requirements.

The invention provides a moisture-proof corrugated board and a production process thereof. The moisture-proof corrugated board comprises inner paper, core paper and surface paper which are sequentially arranged, and the surfaces of the inner paper and the core paper are coated with moisture-proof coatings; the invention relates to a preparation method of an anti-aging agent. The moisture-proof coating is prepared from the following raw materials: 35 to 45 parts of waterborne acrylic resin, 10 to 16 parts of fluorine modified shape memory polyurethane, 8 to 12 parts of waterborne polyurethane dispersion, 4 to 8 parts of bamboo charcoal loaded nano silver-zinc oxide composite particles, 3 to 6 parts of hydrophobic nano silicon dioxide, 5 to 9 parts of chitosan modified nano cellulose, 1.5 to 2.5 parts of silane coupling agent, 0.8 to 1.2 parts of dispersing agent, 0.2 to 0.4 part of defoaming agent and 0.5 to 0.9 part of wetting leveling agent. The corrugated board provided by the invention has excellent moisture resistance, mildew resistance and structural stability.

The present invention describes a method for treating cellulosic materials with a composition comprising hemicellulose and / or lignin and a sucrose fatty acid ester to modify the barrier function of such materials. The disclosed method uses hemicellulose or lignin in combination with a sugar fatty acid ester to form a film on the cellulosic material, and the disclosure includes providing products made by such methods. Materials so treated exhibit more effective barrier function and mechanical properties and can be used in any application where such characteristics are desirable.

The invention provides high-temperature-resistant textured paper and a preparation process thereof, and belongs to the technical field of textured paper. The preparation process comprises the following steps: preparing the raw paper; preparing a gum dipping solution; and impregnating the raw paper. The preparation method comprises the following steps: by taking p-vinylbenzoic acid and 2-vinylpyridine as functional monomers, mixing the p-vinylbenzoic acid and 2-vinylpyridine with styrene, butadiene and tert-dodecanethiol, adding the mixture into an emulsifier solution, emulsifying to prepare a pre-emulsion, then carrying out copolymerization under the initiation of potassium persulfate to prepare modified styrene-butadiene latex, and introducing carboxyl to form a strong hydrogen bond, so as to obtain the modified styrene-butadiene latex. According to the modified styrene-butadiene latex, the action force between molecular chains is remarkably enhanced, polar nitrogen atoms of pyridine rings and polar groups in adjacent molecular chains can form dipole interaction, the binding force between molecules is enhanced, and then the thermal stability of the styrene-butadiene latex is improved. The high temperature resistance of the prepared masking paper can be effectively improved.

The invention relates to the technical field of tipping paper, and particularly provides water-based tipping paper. The problems that traditional water-based tipping paper is uneven in appearance and unstable in suction resistance due to moisture absorption expansion are solved. Comprising an activated carbon layer, a moisture absorption layer and a water-based outer layer, the moisture absorption layer and the water-based outer layer are sequentially arranged on the surface of the activated carbon layer, the water-based outer layer is prepared from, by weight, 45-55 parts of waterborne polyurethane, 15-25 parts of hydrophobic nano SiO2, 25-30 parts of deionized water, 1-2 parts of wetting dispersant and 0.1-1 part of defoaming agent, and the average particle size of the hydrophobic nano SiO2 is 20-50 nm. The hydrophobic nano SiO2 is nano SiO2 modified by octadecylsilane, and the solid content of the waterborne polyurethane is 30%. The expansion rate of the tipping paper in a high-humidity environment is remarkably reduced, the air permeability is stable, the appearance is flat, and the smoking experience is consistent. And compared with a traditional product, the environment-friendly property and the practicability are both achieved, and the good application prospect is achieved.

Highly active defoamer compositions which are storage stable and maintain their defoaming efficiency for extended times even in harsh chemical environments are prepared by an aqueous base-catalyzed condensation of a hydroxy-terminated polyorganosiloxane, a silicone resin bearing hydroxy groups or hydroxy-reactive groups, and hydrophilic silica. The condensation takes place at a temperature of 80°C to less than 130°C, and the reaction viscosity is monitored to determine an appropriate time to add the hydrophilic silica.

Methods are provided for defoaming water used in processing of various products such as cellulose or wood-based products or in food processing which is formed by reacting a fatty acid with a compound selected from the group consisting of ammonia, sodium, potassium and combinations thereof so as to form a water soluble soap, dispersing the water soluble soap in water and homogenizing the dispersed water soluble soap with hydrophobic oil or hydrocarbon oil to produce the emulsion. Methods for preparing an emulsion used in this process are also provided. The emulsion is advantageous in that it can improve water resistance and / or reduce the use of water resistant additives during processing of cellulose or wood-based products or food-grade products.

The invention discloses a bi-component epoxy dip-coating paint for a strong-permeation boiling-resistant water-based textile paper tube and a preparation method of the bi-component epoxy dip-coating paint, and belongs to the technical field of water-based paints. The coating is composed of a component A and a component B, wherein the component A is a composite wetting penetrant composed of a self-emulsifying submicron waterborne epoxy dispersion, dioctyl sodium sulfosuccinate and an acetylene glycol surfactant; and the component B is a quick-drying water-soluble modified polyamine curing agent added with a reactive curing accelerator. Through the cooperation of the small-particle-size epoxy dispersoid and the composite wetting penetrant, the technical problems that a traditional water-based paint is poor in permeability to paper tube fibers and weak in adhesive force are solved; meanwhile, through the synergistic effect of the quick-drying curing agent and the accelerant, the drying time is shortened. The coating has the characteristics of low VOC (volatile organic compound) content, environmental protection, safety, high permeability to paper tube base materials, high drying speed and excellent adhesive force, and a compact paint film formed after curing has saturated water vapor cooking resistance.

The invention discloses a preparation method of coated gift packaging paper. The preparation method comprises the following operation steps: S1, pulping: respectively pulping bleached sulfate softwood chemical pulp, bleached sulfate broadleaf wood chemical pulp and alkaline hydrogen peroxide bleached poplar chemimechanical pulp, and mixing to form mixed pulp; s2, auxiliary material adding, wet paper sheet forming and pre-drying; s3, coating and sizing are conducted, specifically, the front face and the back face of the paper sheet are coated with a coating respectively, and the coating comprises coating-grade light calcium carbonate, coating-grade talcum powder, a dispersing agent, sodium hydroxide, modified acrylic copolymer emulsion, polyvinyl acetate latex, coating starch, sodium carboxyl cellulose, a lubricating agent and a defoaming agent; s4, carrying out post-drying and carrying out super-soft calendering treatment by adopting eight rollers and seven pressing areas; the invention also provides the coated gift packaging paper prepared by adopting the preparation method, the smoothness of the coated gift packaging paper is greater than 1200s, the roughness of the coated gift packaging paper is less than 1.2 microns, and the coated gift packaging paper completely meets the requirements of the coated gift packaging paper for absorbing and drying gravure or flexographic printing water-based ink.

The present invention provides a porous paper-based decorative material and a preparation method thereof. The preparation method comprises: S100, separately preparing a porous paper base, an anti-mildew coating, and a decorative coating; S200, applying the anti-mildew coating to the paper base and performing a first heat treatment to form an anti-mildew layer on the porous paper base; S300, applying the decorative coating to the anti-mildew layer and performing a second heat treatment to form a decorative layer on the anti-mildew layer, thereby obtaining the porous paper-based decorative material. The porous paper base comprises hollow silica particles, the anti-mildew coating comprises chitosan, and the decorative coating comprises sodium alginate. The temperature of the first heat treatment is 80°C to 90°C, and the temperature of the second heat treatment is 100°C to 110°C. The present invention can produce a porous paper-based decorative material with good mechanical strength and resistance to mildew.

The invention discloses a preparation method of a silicone oil modified polyether defoaming agent, which is characterized in that alkynol (EO / PO type) block polyether and allyl alcohol (PO / EO type) block polyether are subjected to addition reaction under the action of a catalyst to generate the silicone oil modified polyether defoaming agent. The silicone oil modified polyether defoaming agent disclosed by the invention has the characteristics of high foam breaking speed and long foam inhibition period; the defoaming agent provided by the invention has the advantages of high temperature resistance, excellent chemical stability and excellent compatibility, and compared with a traditional polyether defoaming agent, the defoaming agent provided by the invention can achieve a better defoaming effect under the condition of a relatively low addition amount.

The present invention discloses a foam control agent and a method for controlling foam in paper or pulp production by using the foam control agent, wherein the foam control agent contains at least a branched alcohol.

The application discloses a kind of strong penetration cooking-resistant type water-based textile paper tube two-component epoxy dip coating and preparation method thereof, belong to water-based paint technical field.The coating is composed of A component and B component, A component uses the composite wetting penetrant that self-emulsifying submicron water-based epoxy dispersion and sulfobutane acid dioctyl sodium salt, acetylene glycol surfactant are composed of;B component selects fast-drying water-soluble modified polyamine curing agent, adds reactive curing accelerator.By the synergy of small particle size epoxy dispersion and composite wetting penetrant, the technical problem that traditional water-based paint is poor in paper tube fiber permeability, weak adhesion is solved;At the same time, through the synergistic effect of fast-drying curing agent and accelerator, the drying time is shortened.The coating has the characteristics of low VOC content, environmental protection safety, strong penetration to paper tube substrate, fast drying speed, excellent adhesion, and the dense paint film formed after curing has the performance of saturated water vapor cooking resistance.

The invention belongs to the technical field of emulsion synthesis, and relates to an acrylic emulsion for a high-flexibility paper mat and a preparation method of the acrylic emulsion, and the formula components of the acrylic emulsion comprise a monomer component, an emulsifier, an initiator, an auxiliary agent, a pH regulator and water, the monomer component comprises methyl methacrylate, butyl acrylate, styrene, acrylic acid, polyethylene glycol 400 diacrylate and acrylamide, and the emulsifier comprises lauryl sodium sulfate. The Z particle size of the acrylic emulsion obtained through the scheme is smaller than 55 nm, when the acrylic emulsion is used as a coating, glossiness is high, a mat surface is bright, the mat surface is stiff and smooth, meanwhile, the folding performance is good, and the coating is kept intact after the acrylic emulsion is folded for one hundred times or a heavy object is pressed for 24 hours after the acrylic emulsion is folded.

The invention relates to the technical field of impregnated paper, in particular to a spraying process for improving color stability of impregnated paper, which comprises the following steps: step (1) pretreatment of melamine impregnated paper; (2) spraying the surface of the pretreated melamine impregnated paper with a spraying liquid; and (3) the sprayed impregnated paper is cured in a stepped curing mode, an interpenetrating network structure of a nano-cellulose skeleton and beta-cyclodextrin filling holes can be formed on the surface of the melamine impregnated paper through spraying liquid, a stable film layer structure is formed on the surface of the melamine impregnated paper, a color layer is protected and stabilized, and the surface of the melamine impregnated paper is protected. The color stability is greatly improved due to double protection of chemical removal of the antioxidant modified beta-cyclodextrin and physical shielding of the nano-zinc oxide.

The invention provides aramid precipitation nanofiber reinforced aramid paper as well as a preparation method and application thereof, and belongs to the technical field of aramid insulation paper. The meta-aramid precipitation nanofibers are adopted to prepare the fiber coating, a compact protection layer is formed on the surface of the aramid paper after coating, pores in the surface of the aramid paper are filled, the overall structure of the aramid paper is densified, the concentration of electron traps is increased, electron breakdown paths are reduced, and compared with para-aramid precipitation nanofibers, the surface of the aramid paper is more compact. In the preparation process, water is used as a solvent, no organic solvent is contained, the aramid paper is safe, environmentally friendly, green and non-toxic, the aramid fibers cannot be damaged, and various properties of the aramid paper are further improved.

The application relates to the technical field of paper for fuel cells, and particularly discloses carbon fiber raw paper for fuel cells and a preparation method thereof, which comprises the following components: 100 parts (70-95 parts of short-cut carbon fibers and 5-30 parts of water-soluble fibers) of fibers, 40-50 parts of dispersant A, 50-100 parts of dispersant B and 0.5-1 part of defoaming agent; after the short-cut carbon fibers and the water-soluble fibers are defibrated, the dispersant A is added for mixing and high-speed stirring to complete foam dispersion, water is added for dilution to first-concentration carbon fiber slurry; the defoaming agent is added for first-time stirring to obtain carbon fiber dispersion slurry; the remaining dispersant A and the dispersant B are added for second-time stirring, water is added for dilution to second-concentration carbon fiber slurry; the second-concentration carbon fiber slurry is used for papermaking to obtain the carbon fiber raw paper for fuel cells. The carbon fibers are prone to occur in the dispersion process, the phenomenon of silk and flocculation is solved, the paper uniformity is good, the tensile strength is high, the carbon fiber raw paper for fuel cells is used for fuel cells, and the important index requirements of porosity and resistance and the like are met.

The invention discloses a spatial reticular silicon paste type defoaming agent as well as a preparation method and application thereof. The preparation method comprises the following steps: putting fluorine-containing ethynyl MQ silicon resin, hydrogen-containing silicone oil, hydroxyl silicone oil, hydrophobic SiO2 and dimethyl silicone oil into a reaction kettle, carrying out nitrogen protection, stirring and heating to 65-90 DEG C, adding chloroplatinic acid, carrying out an addition reaction for 0.5-2 hours, then adding a base catalyst, continuing to heat to 120-140 DEG C, carrying out a condensation polymerization reaction for 2-4 hours, cooling and discharging to obtain spatial reticular silicon paste; mixing the spatial reticular silicon paste, the polyether modified silicone oil, polyether and the emulsifier, stirring and heating to 55-65 DEG C, adding deionized water for phase inversion emulsification, cooling, adding deionized water, and adding the thickener to obtain the spatial reticular silicon paste type defoaming agent. Compared with the traditional silicon paste type defoaming agent in papermaking pulping, especially chemical pulping, the defoaming agent prepared by the invention has the characteristics of high black liquor defoaming speed, good foam inhibition property, good pulp washing water filtration property, no toxicity, no harm and simple preparation process.

Disclosed is a method for manufacturing a base paper for eco-friendly paper cups and, more specifically, to a method for manufacturing a base paper for eco-friendly paper cups, the method enabling the manufacturing of a base paper for eco-friendly cups, which has excellent heat sealability, water resistance, and block resistance, facilitates recycling, and is biodegradable in nature.

The present invention relates to the technical field of fiber fabric materials, and specifically to an aromatic polyamide surface felt and a preparation method thereof, wherein the preparation method comprises: S1, uniformly dispersing a dispersant and a defoaming agent in water to prepare white water; the dispersant comprises an ionic dispersant and a thickening dispersant; S2, dissociating and dispersing aramid fibers in white water to prepare a fiber dispersion slurry; S3, using the fiber dispersion slurry to paper-make a fiber web; S4, applying a wetting agent and an adhesive on the surface of the fiber web; S5, drying and heat-treating to obtain the aromatic polyamide surface felt. The surface felt has good mechanical properties, dimensional stability, chemical stability, flexible and adjustable gram weight, good air permeability, and excellent resin impregnation, and has great application potential in the application field of composite material structural parts.

The invention discloses two types of 50-200g / m < 2 > flame-retardant paper, namely flame-retardant wood pulp paper and flame-retardant mixed pulp paper, the two types of paper adopt completely different fiber base materials, and the formula composition, the preparation process and the performance difference are obvious. The flame-retardant wood pulp paper takes wood pulp as a base material, adopts a phosphorus-nitrogen cross-linked flame-retardant system, is matched with an accurate chemical auxiliary agent ratio, has high breakage resistance, high stiffness and high flame-retardant grade, and is suitable for archive envelopes and high-end packages; the flame-retardant mixed pulp paper takes regenerated mixed pulp as a base material, adopts a synergistic adsorption flame-retardant system, is flexible and folding-resistant, is low in cost, and is suitable for universal scenes such as roll skins, envelopes, paper bags and the like. The gradient formula is designed for the full gram weight interval of 50-200 g / m < 2 >, the dosage of the flame retardant and the auxiliary agent is precisely increased along with the gram weight, the paper is self-extinguished when being away from fire, dripping is avoided, halogen is avoided, the paper is environmentally friendly, the formula and the process are designed in a closed-loop mode, the technical barrier is high, imitation is difficult, and the method is suitable for industrial mass production and intellectual property protection.

The application belongs to the technical field of papermaking, and particularly relates to a domestic fiber anti-fake coated cigarette card paper and a production process thereof. The domestic fiber anti-fake coated cigarette card paper comprises a base paper layer, a coating layer and a back adhesive layer. The base paper comprises a surface layer, a core layer and a bottom layer. The anti-fake domestic fiber accounts for 4-6% of the surface layer, 1-3% of the core layer and 6-9% of the bottom layer. The coating layer is coated on the surface layer and is divided into three layers, i.e., a pre-coating layer, a middle coating layer and a surface coating layer. The back adhesive layer is coated on the bottom layer. The application adds the anti-fake domestic fiber with different proportions in three layers to form a unique texture on the paper plane. The three-dimensional fiber texture with different levels and different brightness can be observed through light. The anti-fake fiber on the surface layer of the paper surface is greater than or equal to 50 per 55*22 mm, and the anti-fake fiber on the bottom layer is greater than or equal to 140 per 55*22 mm. The prepared coated cigarette card paper can be effectively distinguished from ordinary white card paper and has the anti-fake function.

Disclosed is a base paper for eco-friendly paper cups and, more specifically, to a base paper for eco-friendly paper cups, which is eco-friendly by having recyclability and biodegradability while retaining water resistance, oil resistance, heat sealability, and block resistance required as a base paper for paper cups.

The invention relates to the technical field of mica plates, and discloses a high-temperature-resistant mica plate and a preparation process thereof, and the high-temperature-resistant mica plate is formed by hot-pressing a plurality of layers of mica paper, and a glue solution I, a glue solution II and a glue solution III which are sequentially coated; wherein the first glue solution contains organic resin and flame-retardant filler, the second glue solution contains aluminum dihydrogen phosphate, and the third glue solution contains low-melting-point glass powder. The preparation process comprises the following steps: respectively preparing three glue solutions; impregnating mica paper in the glue solution, and drying for the first time to obtain semi-cured mica paper; dipping in the glue solution II and drying for the second time to form an inorganic transition layer; then dipping in a glue solution III and drying for the third time to obtain a composite dipping prepreg; and finally, stacking the prepreg, and carrying out hot-pressing curing and post-treatment at high temperature and high pressure. According to the invention, a compact ceramic skeleton can be formed in situ at high temperature, the problems of pyrolysis failure of organic glue and falling of mica sheets are solved, and the moisture-proof insulating property is good.

The invention provides water-resistant bobbin base paper and a process thereof, and the bobbin base paper comprises the following components in parts by weight: 80-120 parts of a natural wood fiber raw material, 3-9 parts of chitosan, 4-12 parts of a waterproof emulsion, 3-9 parts of a treating agent, 2-6 parts of a defoaming agent, 1-3 parts of a sterilizing agent and 2-4 parts of a cross-linking agent, the natural wood fiber raw material is one or a mixture of more of commercial paper pulp, waste paper and straw agricultural wastes; the commercial paper pulp is one or more mixed pulp of bleached softwood pulp, bleached hardwood pulp, dissolving pulp or unbleached paper pulp, the preparation process is simple, the prepared bobbin body paper has the advantages of high strength, water resistance and easiness in printing, meanwhile, the bobbin body paper also has excellent waterproof performance, and the service life of a bobbin paper product is prolonged.

The invention relates to the technical field of papermaking, and discloses a method for preparing cardboard paper by using composite mineral fibers, which comprises the following steps: dispersion and micro-nano treatment of attapulgite, preparation of a chitosan-attapulgite composite material, preparation of composite mineral fibers, paper pulp mixing and papermaking. Through micro-nanocrystallization treatment of attapulgite and coating modification of chitosan, the binding force of the composite mineral fiber and the paper pulp fiber is remarkably enhanced, and the mechanical properties such as tightness, burst index and ring crush index of finished paper are superior to those of standard requirements; besides, by adding the composite mineral fibers, fine fibers in the white water are removed, the fiber retention rate is increased, part of paper pulp fibers can be replaced, use of chemical auxiliary materials is reduced, the production cost is reduced, the production efficiency and the finished paper quality are improved, and the clean papermaking purposes of quality improvement, efficiency improvement and pollution reduction are achieved. Therefore, considerable economic benefits and social benefits are obtained.