284results about "Natural cellulose pulp/paper" patented technology

The invention discloses a straw paper mulching film based on thermo-mechanical pulp as well as a green preparation method and application of the straw paper mulching film. The invention belongs to the field of biomass resource utilization. Aiming at the defects in the prior art, the invention provides a green preparation method of a straw paper mulching film based on thermo-mechanical pulp. According to the method, the staged hydrothermal grinding technology is adopted, washing is not needed, the acidic paper pulp is directly obtained, and the technological process is simplified. Meanwhile, the invention innovatively develops a green sizing agent taking chitosan as a main material. The sizing agent can be directly fused with acidic paper pulp, and acid and alkali do not need to be additionally added for adjusting the pH value. The dry tensile index of the straw paper mulching film is larger than or equal to 15 N.m / g, the wet tensile index is larger than or equal to 5 N.m / g, the burst index is larger than or equal to 3.5 kPa.m < 2 > / g, the contact angle is larger than or equal to 105 degrees, and the 2-hour water absorption rate is smaller than or equal to 50%.

The invention discloses a manufacturing method of degradable food packaging paper, and belongs to the technical field of food packaging paper preparation, the manufacturing method comprises the following steps: S1, separately grinding softwood pulp and hardwood pulp, and blending to obtain mixed wood pulp; s2, sequentially adding cationic starch, a strong wetting agent and a composite opacifying agent into the mixed wood pulp, and uniformly stirring and mixing; s3, water is added for diluting the mixed pulp, and a fourdrinier is used for papermaking and forming to obtain a wet paper sheet; s4, performing suction dehydration on the wet paper sheet under a vacuum condition, and then performing drying and calendaring to obtain base paper; s5, preparing a composite coating, and coating two sides of the base paper with the composite coating to form a composite coating layer; and S6, heating to cure the composite coating on the base paper to obtain the degradable food packaging paper. According to the food packaging paper, natural renewable resources serve as base paper, degradable materials are coated, and the food packaging paper has good degradability, strength, flexibility, shading effect and waterproof and oil-proof performance.

The invention provides a production method of high-glossiness tipping base paper for cigarettes, which comprises the following steps: step 1, pulping: selecting an appropriate coniferous and hardwood pulp variety, and mixing and pulping coniferous pulp and hardwood pulp; step 2, preparing pulp: adding cationic starch into the beaten pulp; step 3, sizing in the pulp: adding a sizing agent into the pulp to adjust and control the water absorption of the paper; step 4, manufacturing and molding, namely diluting the sizing agent after sizing and then carrying out calendering treatment; step 5, prime coating: carrying out prime coating treatment on the produced tipping base paper for the cigarettes; step 6, top coating: carrying out top coating treatment on the surface of the paper subjected to bottom coating and primary baking; 7, back application, state adjustment and calendering are conducted, and the high-glossiness tipping base paper for the cigarettes is obtained. The emulsion is prepared to form a film on the base paper, so that the glossiness of the tipping base paper for the cigarettes is improved.

The invention provides a low-interception hollow paper tube, and belongs to the technical field of tobacco heating. The low-interception hollow paper tube has a multi-layer structure and comprises at least one low-interception layer and at least one heat-resistant layer, wherein the innermost layer of the multi-layer structure is a low-interception layer, and the low-interception layer comprises paper and a smoothing agent coating formed on the inner surface of the paper. The invention further provides a preparation method of the low-interception hollow paper tube and a heated cigarette. According to the low-interception hollow paper tube, interception of aerosol on the inner wall of the paper tube can be reduced, meanwhile, heat can be prevented from being transmitted to the acetate fiber filter tip section, and the lip scalding problem is avoided.

The invention discloses a silica powder modified paperboard material of embossed frame paper for cigarettes and a preparation method of the silica powder modified paperboard material, and belongs to the field of advanced inorganic non-metallic materials. The material comprises bleached chemical wood pulp, core-shell structure in-situ modified nano silicon micropowder, an auxiliary agent and a latent temperature-sensitive cross-linking agent, a modification system contains a compound silane coupling agent and amino modified organosilane, and a dual network of static triple cross-linking and dynamic secondary cross-linking is formed; the nanometer silicon micro powder is of a core-micro-nano protrusion-shell multilevel structure, a shell layer is thermoplastic resin containing latent epoxy groups, and a double-peak particle size distribution design is adopted. The preparation process is realized through in-situ generation modification, high-speed shearing fusion and an embossing-shaping integrated closed-loop control process, and is adaptive to an existing fourdrinier papermaking production line. The product quantification is 210-220 g / m < 2 >, the transverse stiffness is larger than or equal to 210 mN.m, the embossing retention rate is larger than or equal to 99.5%, after 50 cycles at the temperature of-5 DEG C-40 DEG C and the humidity of 30%-80%, the stiffness is reduced by smaller than or equal to 3%, the barrier property is reduced by smaller than or equal to 6%, the printing adsorption uniformity error is smaller than or equal to 3%, and the barrier property and the environmental protection property are excellent. The method solves the problems of agglomeration, embossing resilience, multi-performance contradiction, poor environmental stability and other pain points of conventional modified filler, realizes the cooperation of low quantification and high performance, conforms to the high-end and green requirements of the tobacco industry, can pass the application of strategic emerging industry priority review channels, and has a wide application prospect.

The invention belongs to the field of new materials, and relates to an ultrathin thermal insulation material and a preparation method thereof. Aiming at main problems of existing aerogel heat insulation products and actual requirements of related fields on efficient heat insulation products, in combination with functional characteristics of nano-porous silicon, natural plant fibers are taken as carriers, SiO2 aerogel, nano-porous silicon and other functional materials are uniformly mixed with the plant fibers, and the composite material is prepared. And an environment-friendly and degradable new product with heat preservation and heat insulation functions is obtained through a papermaking process. The heat conductivity coefficient of the obtained ultrathin heat preservation and insulation material is smaller than or equal to 0.025 W / (m.K), and a convenient method is provided for large-scale and continuous production of the low-cost ultrathin heat preservation and insulation material. The method is easy and flexible to operate, high in operability and easy to industrially popularize and apply.

The present disclosure provides a fluorochemical-free grease barrier paper comprising a base paper, wherein: a first side of the base paper is impregnated with a first composition comprising oxidized starch, dextrin, a crosslinker and a wax, such as alkyl ketene dimer (AKD); and a second side of the base paper is impregnated with a second composition comprising oxidized starch, dextrin and a crosslinker.

A mold (102, 103, 15, 201, 25) system for forming a container (22) is described. The mold (102, 103, 15, 201, 25) system includes a mold (102, 103, 15, 201, 25) including a mold cavity (115, 203) and an opening (117), and a mandrel (123, 125, 403) system including a reference point (133), mandrels (123, 125, 403), and expandable members (123, 125). The mandrel (123, 125, 403) is at least partially located inside the expandable member (123, 125) or is at least partially locatable inside, and includes one or more holes (135) through which fluid can flow from inside the mandrel (123, 125, 403) to outside the mandrel (123, 125, 403) to expand the expandable member (123, 125) during use. When the mandrel (123, 125, 403) is at least partially located inside the expandable member (123, 125), the reference point (133) is in a fixed position relative to the mold (102, 103, 15, 201, 25), and the mandrel (123, 125, 403) and the expandable member (123, 125) extend into the mold cavity (115, 203) through the opening (117) having a gap between the expandable member (123, 125) and the base (119) of the mold cavity (115, 203) on the side opposite the opening (117), such that the mandrel (123, 125, 403) system is positionable relative to the mold (102, 103, 15, 201, 25). At least a portion of the expandable member (123, 125) and the mandrel (123, 125, 403) are movable relative to the reference point (133) to vary the gap.

A mould (102, 103, 15, 201, 25) system for moulding a receptacle (22) is described. The mould (102, 103, 15, 201, 25) system comprises a mould (102, 103, 15, 201, 25) comprising a mould cavity (115, 203) and an opening (117), and a mandrel (123, 125, 403) system comprising a reference point (133), a mandrel (123, 125, 403) and an expandable member (123, 125). The mandrel (123, 125, 403) is at least partially located, or at least partially locatable, inside the expandable member (123, 125) and comprises one or more holes (135) through which a fluid is flowable in use from an interior of the mandrel (123, 125, 403) to an exterior of the mandrel (123, 125, 403) to expand the expandable member (123, 125). When the mandrel (123, 125, 403) is at least partially located inside the expandable member (123, 125), the mandrel (123, 125, 403) system is positionable relative to the mould (102, 103, 15, 201, 25) such that the reference point (133) is at a fixed position relative to the mould (102, 103, 15, 201, 25) and the mandrel (123, 125, 403), and the expandable member (123, 125) extend into the mould cavity (115, 203) through the opening (117) such that there is a clearance between the expandable member (123, 125) and a base (119) of the mould cavity (115, 203) opposite the opening (117). The expandable member (123, 125) and at least a part of the mandrel (123, 125, 403) are moveable relative to the reference point (133) to vary the clearance.

The embodiment of the invention provides a method for forming a base material capable of being washed away. The method comprises the steps that S1, a single-layer wet web is formed through a forming device, and S2, the wet web is subjected to spunlace reinforcement; s3, the wet web subjected to spunlace reinforcement is subjected to primary drying, and a primary dry web is formed; s4, wetting liquid is sprayed to the primarily-dried web for wetting to form a wetted web, the wetting liquid comprises 0.2%-3% of PAE, and the moisture content of the primarily-dried web is made to be 10%-13%; s5, performing micro-embossing treatment on the wetted web to form a micro-embossed web; s6, secondary drying is conducted on the micro-embossed web to form a final-dried web, the water content of the final-dried web is 6-9%, through the treatment, more hydroxyl groups are formed on the surface layer to be combined with wood pulp fibers, the wood pulp fibers are fixed, in addition, fiber pores on the surface are actually reduced through micro-embossing, the situation that wood pulp fibers fall off to form falling scraps is further reduced, and the quality of the wood pulp fibers is improved. In addition, through the structural arrangement, the flushability is improved.

The preparation method of the environment-friendly anti-aging packaging base paper comprises the following steps: taking softwood pulp and dissolving pulp, pulping for the first time, adding microcrystalline cellulose, and stirring to form first pulp; adjusting the pH value of the first slurry to be neutral, adding a water-soluble chitosan-polyphenol compound, and pulping for the second time to form second slurry; adding oxidized sodium alginate into the second pulp, and pulping for the third time to form third pulp; forming raw paper according to a papermaking process; the invention further provides packaging base paper which has the characteristic of good anti-aging performance. Softwood pulp and dissolving pulp are used as papermaking raw materials, microcrystalline cellulose, a water-soluble chitosan-polyphenol compound and oxidized sodium alginate are used, a pulping process which is sequentially added according to a sequence is formed, a stable fiber network is constructed layer by layer, and a mechanism of skeleton supporting, covalent crosslinking and antioxidant end capping is formed. The anti-aging performance of the raw paper is improved.

The invention relates to the technical field of manufacturing of coated paperboards, in particular to frame paper for cigarettes and a preparation process of the frame paper. The problem that the mechanical property and the barrier property cannot be considered at the same time in the prior art is solved. According to the frame paper for the cigarettes, the bleached hardwood pulp and the softwood pulp are compounded, and the calcium carbonate and the nanocellulose crystals are added to prepare the high-uniformity modified paper base; then, polycaprolactone diol, isophorone diisocyanate, dimethylolpropionic acid and 1, 4-butanediol are subjected to a reaction, aminopropyltriethoxysilane is used for blocking, obtained polyurethane emulsion is mixed with gelatinized starch and flaky kaolin step by step, and the composite coating is prepared; coating double surfaces of the modified paper base with the composite coating, and performing step-by-step drying, hot-pressing shaping and curing to obtain the paper. Through multi-stage cooperation of paper base-coating-process, the frame paper has excellent mechanical properties, high printing stability and high barrier property, and is suitable for the field of high-grade cigarette packaging with strict performance requirements.

A mandrel system for use with a mold to form a container is described. The mandrel system includes a component, a mandrel, and an expandable member. The mandrel is at least partially disposed within or at least partially disposable within the expandable member and has one or more holes through which fluid can flow from the interior of the mandrel to the exterior of the mandrel to expand the expandable member during use. The expandable member is attachable or attachable to the component. When the expandable member is attached to the component and the mandrel is at least partially disposed within the expandable member, the end of the mandrel is movable relative to the component to vary the length of the expandable member and thereby vary the width of the expandable member.

A method of forming a container is described. The method includes providing a mold, providing a partially formed container within the mold, providing an expandable member (in a first configuration) within the partially formed container, moving the expandable member (in the first configuration) into contact with a base of the partially formed container such that the expandable member deforms towards a peripheral portion of the base of the partially formed container, inserting fluid into the expandable member to expand the expandable member from the first configuration to a second configuration that is more expanded than the first configuration so as to press the partially formed container against an inner surface of the mold through a process of forming the container from the partially formed container.

The present invention addresses the problem of producing a fibre-based material such as paper, paperboard or cardboard, for example, which dispenses / releases flavourings, nutrients, additives and / or starch on contact with water (e.g. hydrolysis). Fibre-based materials of the type in question are not known. According to the invention, this problem is solved in that the cellulose fibres used in paper production are subjected to a method (treatment) that opens (splits) the hydrogen bridge-type bonds between the H and O atoms. This method is characterised in that the cellulose (cellulose fibres) is dissolved in liquid (e.g. water) and is brought to boil above the boiling point. Then, sweeteners (e.g. cyclamate, saccharin, thaumatin, fructose) and acidifiers such as citric acid and preservatives such as sorbic acid / potassium sorbate are added. Furthermore, the desired reactions / functions to be released, such as flavourings, nutrients, additives and / or starch, are added to the boiling liquid and the liquid containing the fibrous materials is boiled for a time. Using the conventional paper production method, the liquefied cellulose (cellulose fibres) can then be further processed and dried in the normal manner.

The invention relates to the field of drawing paper, and particularly discloses mark pen double-sided drawing paper and a production process thereof. The mark pen double-sided drawing paper comprises a first body paper layer, a coating layer and a second body paper layer which are arranged in sequence, the coating layer is formed by coating a coating solution according to the coating weight of 1-5 g / m < 2 >, and the coating solution is a chitosan-sodium alginate-sodium alginate propylene glycol ester coating solution. By designing a composite structure of the first body paper layer, the coating layer consisting of chitosan-sodium alginate-sodium alginate propylene glycol ester and the second body paper layer, the paper for double-sided drawing by the mark pen has the advantages that the anti-permeation performance of the paper is remarkably improved, ink is prevented from permeating to the other side of the paper, the feasibility of double-sided drawing is ensured, and the paper is suitable for popularization and application. Meanwhile, the ink permeation speed and the drying speed are high, the brightness and uniform distribution of the ink of the mark pen are kept, and the drawing effect is more ideal.

The invention relates to a method for producing an oxygen barrier material, comprising: providing a support layer comprising paper and a first coating, applying a second coating on the support layer by extrusion technique, thereby forming a second coating on the support layer, the second coating having a gram weight of between 5 and 50 g / m2, where the second coating is compostable and / or biodegradable in industrial compost, the first coating is made to be at least 90% biodegradable within 6 months, the polymeric material in the first coating is biodegradable, the oxygen barrier material is compostable, and the oxygen barrier material has an oxygen barrier value of less than 70 cc / m2 * day. The invention also relates to an oxygen barrier material.

The invention belongs to the technical field of hygienic product materials, and particularly relates to a preparation process of ultrathin absorbent paper.The ultrathin absorbent paper is prepared from, by weight, 15-35 parts of base paper raw pulp, 3-5.5 parts of SAP, 0.2-0.4 part of wet strength agent, 0.8-1.2 parts of passivating agent and 20 parts of wet paper pulp, the wet paper pulp is prepared based on fluff pulp and softwood pulp through defibering treatment, and the wet strength agent and the passivating agent are added into the wet paper pulp. After being compounded with a passivating agent, an oily physical barrier can be formed by virtue of rich hydrophobic groups in a molecular chain, so that the direct contact capacity of the SAP and water molecules is reduced, the water grabbing phenomenon of the SAP is improved, meanwhile, the technological process is improved, and the blanking uniformity and the production efficiency of the SAP are improved; a safer, more efficient and more stable technical scheme is provided for industrial production of the absorbent paper.

The invention discloses an antibacterial and bacteriostatic bamboo-wood fiber-based food material packaging box and a preparation method thereof, and relates to the technical field of packaging materials. The packaging box is composed of a paper base layer and an antibacterial coating on the surface of the paper base layer. Wherein the paper base layer is made of mixed paper pulp; the antibacterial coating is obtained by coating the surface of the paper base layer with an antibacterial coating; the antibacterial coating is prepared from the following raw materials in parts by mass: 30 to 40 parts of deionized water, 2 to 2.4 parts of polyvinyl alcohol, 1.2 to 1.5 parts of glycerol, 6.7 to 7.3 parts of antibacterial particles, 0.1 to 0.4 part of rosmarinic acid and 0.5 to 0.8 part of modified silicon dioxide; the antibacterial particles are formed by mesoporous carrier materials loaded with wormwood essential oil. Due to the introduction of components such as the antibacterial particles and the modified silicon dioxide, the long-acting antibacterial, waterproof and fresh-keeping capacities of the bamboo-wood fiber-based food material packaging box are effectively improved. Therefore, the method has a wide application prospect.

This tobacco sheet for a non-combustion heating-type flavor inhaler contains a tobacco powder having a cumulative 90% particle diameter (D90) of at least 200 µm in a volume-based particle size distribution as measured by a dry laser diffraction method.

To provide packaging paper which has a reduced load on the environment, has excellent flexibility in following dies and the like when packaging with machines, has excellent breaking resistance, and also has heat sealability; and a packaging body that is formed of the packaging paper.SOLUTION: Packaging paper has a heat seal layer on a paper substrate, wherein the paper substrate has a basis weight of 40 g / m2 or less; the content of the paper substrate in the packaging paper is 50 mass% or more; the Clark stiffness in the longitudinal direction of the packaging paper is 15.5 or less; the piercing strength of the packaging paper is 1.3 N or more; and the length-weighted average fiber length of pulp constituting the paper substrate is 0.92 mm or less.SELECTED DRAWING: Figure 1

A fabricating method of a pulp molded container includes providing a main material, performing a dispersing step, performing a pulping step, performing an additive adding step, and performing a heat compression molding step. The main material includes a long fiber pulp and a short fiber pulp. In the dispersing step, the main material is dispersed evenly in water to form an aqueous pulp solution. In the pulping step, the aqueous pulp solution is mechanically fibrillated to form a fibrillated pulp. In the additive adding step, an additive is added into the fibrillated pulp and mixed to form a paper pulp. In the heat compression molding step, the paper pulp is formed into the pulp molded container by heat compression molding.

To provide a water-disintegrable spunlace nonwoven fabric, which can be quickly disintegrated in water and has high wet strength, and also to provide a manufacturing method thereof.SOLUTION: A water-disintegrable spunlace nonwoven fabric is manufactured by wet molding and spunlace processing and includes 60% to 85% in mass fraction of natural fibers and 15% to 40% of regenerated cellulosic fibers longer than the natural fiber. The water-disintegrable spunlace has basis weight of 35 gsm to 55 gsm and thickness of 0.3 mm to 0.5 mm. Water disintegration time is less than 100 s. Wet strength in an MD direction is 3.0 N to 5.0 N. Wet strength in a CD direction is 2.0 N to 3.5 N.SELECTED DRAWING: Figure 1

The invention provides an anti-deformation paperboard for a packaging box and a preparation method thereof.The anti-deformation paperboard comprises two layers of paperboard and a core layer arranged between the two layers of paperboard, and the core layer comprises, by mass, 100 parts of wood leaf fibers; 2 to 4 parts of nano cellulose; 8-12 parts of polyvinyl alcohol; 1 to 3 parts of polyethyleneimine; 4-8 parts of a hydrophilic modified inorganic filler; and 1-3 parts of a cross-linking agent. By optimizing the structure and component proportion of the core layer, the paperboard can keep stable deformation and is not easy to rebound in a crease area after hot press molding, and meanwhile, good dimensional stability is kept under the condition of humidity change, so that the molding precision and the use durability of the packaging box are improved.

The invention discloses a preservative paper preparation process constructed based on a plant bionic crosslinking strategy, which comprises the following steps: S1, dissolving polyvinyl alcohol in deionized water at 93-97 DEG C to form a homogeneous polyvinyl alcohol solution with the concentration of 1.5-3 wt%; s2, adding borax into the solution obtained in the step S1, and stirring at 88-92 DEG C at the stirring speed of 400-600r / min for 25-35 minutes to form a borax mediated pre-crosslinking system; s3, under the continuous alkaline condition, urea is added into the pre-crosslinking system obtained in the S2, stirring continues to be conducted for 25-35 min, and a PVA-urea hydrogen bond three-dimensional compact grid structure is constructed; and S4, sizing the composite coating obtained in the step S3 on the surface of quantitative 35-45 g / m < 2 > of base paper according to the coating weight of 2.5-3.0 g / m < 2 >, and drying at 60-105 DEG C for 8-12 minutes to form the preservative paper base material with the gradient cross-linked structure. By innovating a material modification and structure reconstruction process, the barrier property bottleneck of the paper-based material is broken through, and the barrier property, oil resistance and water resistance of the paper-based material are enhanced while the environment-friendly characteristic is maintained.

The invention relates to the technical field of filtering materials, and mainly relates to an air filtering material and a preparation method thereof. The invention relates to an air filtering material, which comprises the following components: 60-70 parts by weight of wood pulp fiber; 10 to 20 parts by weight of a modified PAN nanofiber; 1-3 parts by weight of a modified PTFE emulsion; 5 to 10 parts by weight of modified PLA; 0.1 to 1 part by weight of chitosan; and 0.01 to 0.1 part by weight of sodium polyacrylate. The preparation method of the air filtering material comprises the following steps: soaking wood pulp fibers in water, and pulping; mixing the pulped wood pulp fibers, the modified PAN nanofibers, the modified PTFE emulsion, the modified PLA, chitosan and sodium polyacrylate to obtain mixed paper pulp; carrying out papermaking by utilizing the mixed paper pulp; and drying and calendering to obtain the air filtering material. The air filtering material provided by the invention also has the effects of high moisture resistance and strong antibacterial property while ensuring high filtering performance.

The invention discloses a low-energy-consumption spunlace process for a dispersible wet-process spunlace non-woven fabric, which comprises the following steps: pulping, wet-process web forming, spunlace reinforcing and drying, opening and scattering fiber raw materials, adding water, mixing, pulping, preparing slurry, conveying the slurry into a wet-process web forming machine, dehydrating to form a wet-state fiber web with disorderly arranged fibers, and drying to obtain the dispersible wet-process spunlace non-woven fabric. A wet fiber web is fed into a spunlace machine through a web curtain, a high-pressure water tank and a spunlace head which are located above the web curtain are arranged in the spunlace machine in a front-back spaced mode, a first spunlace plate is installed at the bottom of the high-pressure water tank, a second spunlace plate is installed in the spunlace head, and the first spunlace plate is used for first-time spunlace reinforcement of the wet fiber web; the wet fiber web is subjected to secondary spunlace reinforcement by using a first spunlace plate, then the wet fiber web is subjected to secondary spunlace reinforcement by using a second spunlace plate to obtain a formed non-woven fabric, the fiber-containing water flow after spunlace is guided into a dehydration box, and the fiber-containing water flow in the dehydration box is guided into a high-pressure water tank through a water pump, so that water is saved, and secondary utilization of fibers in the fiber-containing water flow is realized.

The present invention relates to an adsorption paper and a preparation method thereof, in particular to an adsorption paper suitable for formaldehyde adsorption and a preparation method thereof. In the present invention, zeolite is coated on the outer side of the paper base body, and a polyamide layer with a porous structure is prepared by interfacial polymerization. The polyamide layer fixes the zeolite on the paper base body and avoids physical or chemical damage during subsequent applications, enhancing the strength of the adsorption paper.

The invention provides a nanocellulose styrene composite emulsion and application thereof in air filter paper, and relates to the technical field of functional paper preparation. According to the method, a nanocellulose solution is introduced into an oil phase containing styrene to be emulsified, the high-stability nanocellulose styrene composite emulsion is prepared, and the stability of the nanocellulose styrene composite emulsion is improved from two aspects: firstly, nanocellulose forms a compact covering layer on the surface of a liquid drop, so that demulsification fusion is prevented; and 2, a complex three-dimensional network structure in which fibers and liquid drops are mutually crosslinked is constructed by regulating and controlling the volume ratio of a water phase to an oil phase. After the emulsion is coated on the surface of the filtering base paper and is dried, styrene is subjected to in-situ polymerization in the drying process to form polystyrene microspheres, and firm bonding is generated between fibers and nano cellulose, so that the bonding force between a coating layer and the base paper is remarkably enhanced. The dry / wet tensile strength and bursting strength of the air filter paper prepared by the method are remarkably improved, and the overall stability is excellent.