26 results about "Cotton linters" patented technology

The application relates to the technical field of fabrics, in particular to a fabric based on protein fiber combined with natural fiber and a preparation method thereof, which is prepared by wet core-sheath composite spinning of a down protein sheath layer and a natural cellulose core layer; the core layer is natural cellulose fiber, and the total mass of the functional fabric is 70-90%; the balance is the sheath layer formed by cross-linking and solidification of a down protein solution; and the sheath layer is loaded with nano titanium dioxide; the introduced natural cellulose core layer is the main skeleton component of the fabric, selects natural fibers such as bamboo pulp cellulose and cotton linter pulp, and provides basic mechanical support for the fabric. The abandoned down resource is used to prepare protein fiber, which is combined with natural cellulose fiber to construct a composite fiber with a functional sheath layer and a mechanical core layer. The technical scheme solves the problems of insufficient sun protection, insufficient antibacterial performance and single mechanical performance of traditional natural fiber fabrics.

The invention belongs to the technical field of refined cotton production processes, and particularly relates to a cooking aid for controlling cotton linter cooking polymerization reduction and a production process. The cooking auxiliary agent is prepared from the following components in percentage by mass: 0.35%-1.1% of magnesium chloride, 61.2%-87.7% of a reducing agent and 11.8%-37.7% of a metal chelating agent, totaling 100%. By means of the synergistic effect of the cooking auxiliaries, disordered degradation of cellulose can be effectively blocked in the cotton linter cooking process, the polymerization degree of alkalized cotton is greatly improved, and the polymerization degree can stably reach 3,250 DP or above; the purpose of removing impurities can be achieved; therefore, a guarantee can be provided for obtaining refined cotton with qualified impurity indexes and higher polymerization degree.

The invention particularly relates to a dissolving pulp production process which comprises the following steps: washing and soaking wood chips or cotton linters, and naturally draining to obtain a pretreated raw material; adding adjusting water into the pretreated raw material, then adding sodium sulfite, mixing and stirring, heating and preserving heat, and extracting pre-hydrolysis waste liquid to obtain semi-slurry; the ratio of the absolute dry mass of the pretreated raw materials to the volume of the adjusting water is 1: (5-8); in terms of SO2, the use amount of sodium sulfite is 2%-4% of the absolute dry mass of the pretreated raw material; the heating and heat preservation temperature ranges from 150 DEG C to 160 DEG C, and the heat preservation time ranges from 90 min to 120 min; carrying out sulfate cooking on the semi-slurry to prepare coarse slurry and cooking black liquor; the coarse pulp is bleached, pulped and sieved by adopting an OD0EOPD1 section sequence, and the dissolving pulp is prepared. According to the method, the quality of the dissolving pulp is remarkably improved by adopting sodium sulfite to prehydrolyze the dissolving pulp, the high-end application requirements of cellulose acetate, Lyocell fibers and the like can be met, the vacuum pulp washing link of semi-pulp after prehydrolysis is omitted, the pulp wastage rate is reduced, the MVR evaporator utilizes secondary steam compression reuse, and the water resource utilization rate is improved.

The utility model relates to the technical field of cotton-padded clothes separate test rolling mills, in particular to a fully-adaptive sawtooth cotton-padded clothes separate test rolling mill which comprises a shell, four supporting legs are fixedly connected to one side of the shell, a motor is fixedly connected to one side of the shell, a first through hole is formed in one side of the shell, a roller is rotationally connected to one side of the shell, and a second through hole is formed in the other side of the shell. And one side of the roller is fixedly connected with a first gear disc, one side of the shell is fixedly connected with a supporting plate, and one side of the supporting plate is rotationally connected with a rotating shaft. The utility model has the advantages that: one side of the roller is fixedly connected with the first gear disc, one side of the rotating shaft is fixedly connected with the second gear disc, and the power of the motor is transmitted to the rotating shaft through the mutual meshing of the first gear disc and the second gear disc; and a second sawtooth disc is fixedly connected to one side of the roller, and a first sawtooth disc is fixedly connected to one side of the rotating shaft, so that ginned cotton is stirred open.

The application discloses a method for improving the drainage of cotton stalk chemi-mechanical pulp, and belongs to the field of pulping and papermaking. The method comprises the following steps: after the cotton stalk is crushed, washed and steamed, a first chemical impregnation agent is added, and then mechanical disintegration is performed to obtain cotton stalk material; pectinase is used to perform enzyme pretreatment on the cotton stalk material to obtain pretreated material; a second chemical impregnation agent is added to the pretreated material, mechanical disintegration is performed, and then refining disintegration is performed to obtain refined material; after the refined material is washed, enzyme treatment is performed on the refined material by using pectinase to obtain cotton stalk chemi-mechanical pulp with obviously improved drainage. By selecting pectinase as a biological enzyme and designing a two-stage treatment process of pectinase, pectin substances in cotton stalk raw materials can be effectively removed, pectin is degraded into small molecular substances such as galacturonic acid, the drainage of cotton stalk chemi-mechanical pulp is improved, and the influence of pectin on the papermaking process is eliminated.

The application relates to the technical field of fumigation and moxibustion materials, and discloses a composite fumigation and moxibustion cigarette containing bai-muxiang leaves and a preparation method thereof. The preparation method specifically comprises the following steps: crushing and screening the mugwort straw, soaking the mugwort straw in a sodium hydroxide solution, stirring after adding polyethylene glycol, cooling to-20 to-35 DEG C, keeping the temperature for 10-30 min, heating to 30-50 DEG C, keeping the temperature for 10-30 min, cooling to-30 to-40 DEG C again, keeping the temperature for 1-2 h, replacing, uniformly stirring after adding bai-muxiang leaves, drying, cutting into filaments to obtain pretreated filaments; drying the cotton linters, heating to 400-500 DEG C under nitrogen protection, calcining for 10-20 min, continuously heating to 700-750 DEG C, calcining for 5-15 min, cooling to room temperature with the furnace, crushing, uniformly mixing with the pretreated filaments, spraying tobacco leaf water extract on the surface of the mixture, air-drying after mixing, spraying a water composite extract of Hippophae rhamnoides L. again, and air-drying after mixing.

The invention relates to the technical field of fabrics, in particular to a fabric based on combination of protein fibers and natural fibers and a preparation method thereof.The fabric is prepared from a down feather protein sheath layer and a natural cellulose core layer through wet-process core-sheath composite spinning, the core layer is made of natural cellulose fibers and accounts for 70-90% of the total mass of the functional fabric, and the natural cellulose fibers account for 20-30% of the total mass of the functional fabric. The sheath layer is formed by cross-linking and curing a down feather protein solution; nano titanium dioxide is loaded in the sheath layer; the natural cellulose core layer introduced by the invention is used as a main skeleton component of the fabric, and natural fibers such as bamboo pulp cellulose, cotton linter pulp and the like are selected, so that basic mechanical support is provided for the fabric. According to the invention, the protein fiber is prepared by recycling the waste down, and the protein fiber is compounded with the natural cellulose fiber to construct the composite fiber combining the functional sheath layer and the mechanical core layer. According to the technical scheme, the problems that a traditional natural fiber fabric is insufficient in sunscreen and antibacterial performance and single in mechanical property are solved.

The present application relates to a kind of membrane separation treatment methods of papermaking and cotton linter processing black liquor, comprising the following steps: 1) papermaking black liquor or cotton linter processing black liquor is coarsely filtered, and refined black liquor is obtained;2) refined black liquor is concentrated by multiple reverse osmosis through nanofiltration membrane, and concentrated dealkalization black liquor and permeate are obtained, part of permeate is used as circulating washing liquid, and the rest of permeate is used as recovered pure alkali liquor.When the total flow of permeate is not less than 90% of initial flow during reverse osmosis concentration, maintain high pressure condition to concentrate refined black liquor, when the total flow of permeate is less than 90% of initial flow, use circulating washing liquid to wash nanofiltration membrane under low pressure condition, until the total flow of permeate recovers to more than 90% of initial flow, then restore to high pressure condition to concentrate refined black liquor.This method can prolong the operation cycle of membrane treatment black liquor, prolong the service life of membrane, reduce the operation cost, and is beneficial to the industrialization popularization of membrane method treatment black liquor.

The invention relates to the technical field of cotton pulp board preparation in the papermaking industry, in particular to a low-temperature short-process paper money paper cotton pulp board cooking process which comprises a cotton linter raw material, a composite alkaline cooking agent and a multifunctional additive. The cotton linters are first-level cotton linters or third-level cotton linters, the composite alkaline cooking agent is formed by compounding sodium hydroxide and potassium hydroxide, the molar ratio of sodium hydroxide to potassium hydroxide is 2.5-6.5: 1, and the multifunctional additive is composed of a penetrant, a chelating agent and a stabilizer according to the mass ratio of 3-8: 1-3: 0.5-2. According to the low-temperature short-process paper cotton pulp board cooking process provided by the invention, by constructing a multi-in-one collaborative system, the technical bottleneck of mutual restriction of low temperature and short process, impurity removal efficiency and fiber protection, and product performance and stability in the prior art is broken through, and multi-dimensional technical improvement is realized.

The utility model provides a wastewater treatment device for pulping high-viscosity cotton linters, which relates to the technical field of wastewater treatment devices and comprises a shell, a liquid collecting tank is mounted at the bottom end of the shell, a liquid outlet is mounted at the bottom end of the liquid collecting tank, a filter box is arranged in the shell, a fixing plate is mounted on the surface of the filter box, and a water outlet is formed in the bottom end of the fixing plate. A pull block is installed on the surface of the fixing plate, a side plate is installed on the side face of the fixing plate, a fixing block is installed on the right side of the side plate, a threaded rod is arranged in the fixing block, and a rotating handle is installed on the right side of the threaded rod. The wastewater treatment efficiency and the filtering precision are improved. Due to the sliding connection design between the fixing plate and the shell, the position of the filter box can be adjusted according to needs, and the filter material is convenient to maintain and replace. In addition, the threaded rod is used in cooperation with the rotating handle, the operation process is simplified, and the labor intensity is reduced. And the whole structure is compact, the occupied area is small, and the device is suitable for space-limited working environments.

The application discloses a kind of multi-arm cotton picking robot based on vision, it is related to cotton picking machine technical field, including chassis, cotton picking device, mechanical arm and cotton collecting box, the chassis is divided into three layers, the first layer is the growth area of cotton plant to be picked, the cotton picking device and four mechanical arms are fixedly connected with the second layer of chassis, and the inside of the mechanical arm is provided with the passage that can supply cotton conveying, the cotton collecting box is fixedly connected with the third layer of chassis;The end of the mechanical arm is moved to the vicinity of the cotton to be picked in the application, under the action of the suction of cotton picking device, cotton is brought into cotton collecting box;The application overcomes the phenomenon that cotton linter fiber is pulled off, pulled thin, causes around knot, etc., caused by traditional picking spindle type cotton picker, by pneumatic picking and conveying, the quality of long lint cotton is greatly improved, and the problem of slow artificial harvesting speed and high labor intensity is also solved.

The invention belongs to the technical field of fiber preparation, and provides a high-strength and high-toughness self-twisting regenerated cellulose fiber and a preparation method and application thereof. The preparation method of the high-strength and high-toughness self-twisting regenerated cellulose fiber comprises the following steps: 1) mixing a mixed solution with cotton linter to obtain a cellulose solution; 2) centrifuging the cellulose solution to obtain supernate, and cross-linking the supernate with a cross-linking agent at low temperature to obtain a spinning stock solution; 3) spinning the spinning solution and the mixed solution to obtain the high-strength and high-toughness self-twisting regenerated cellulose fiber, the mixed solution is a mixed solution of alkali, urea and water. According to the method, the flowing and solidification process of the cellulose solution is accurately controlled by utilizing a microfluidic technology, continuous and uniform preparation of the high-strength and high-toughness cellulose fiber is realized, and the structural uniformity and molecular chain ordered arrangement degree of the fiber are remarkably improved, so that the mechanical property of the fiber is effectively enhanced.

The present application relates to a kind of cotton linter pulp chlorine-free bleaching agent and bleaching method, by mass fraction, including persulfate 1.4~7.9 parts, pyrophosphate 2.7~9.2 parts, polyphosphate 1.4~7.9 parts, anionic surfactant 1.4~7.9 parts, 1000 parts of water;The pH of the bleaching agent is 8.5~11.0.The present application is mainly used as persulfate, and low pollution bleaching agent is formed by being matched with pyrophosphate, polyphosphate, anionic surfactant, with good bleaching effect, can effectively remove the colored material attached to cellulose, the degree of damage to cellulose is small, the obtained refined cotton whiteness is above 70, the degree of polymerization is above 1000, the relative unbleached cotton linter pulp is reduced by 15%~64%, without bleaching terminator;The bleaching method of the present application is mild, does not contain chlorine element, reduces pollution load, the COD content in waste liquid after bleaching is below 280 mg / L, green environmental protection.

The invention relates to the technical field of refined cotton production processes, in particular to a cotton linter cooking process based on an electric heating cooking boiler, which comprises the following steps: dispersing cotton linters after cotton opening to obtain treated cotton linters; the treated cotton linters are put into an electric heating digester, the digesting conditions are set, and the mass ratio of alkali liquor to the cotton linters in the digesting conditions is (10-12): 1; the method comprises the following steps: fully dipping cotton linters under the action of a penetrant, then carrying out alkaline cooking, rapidly cooling a cooked cotton linter sample, washing until filtrate is neutral, removing excessive moisture in cotton pulp, and carrying out vacuum drying to determine the polymerization degree of the cotton linters. According to the method, the cooking condition of a large liquid ratio is controlled, so that the temperature control in the cooking process is more constant, and the polymerization degree and the uniformity of the sample are greatly improved.

This invention relates to the field of cable material technology, specifically to a high-performance wear-resistant underground cable sheath material and its preparation method, comprising the following raw materials in parts by weight: 100 parts polypropylene resin, 10-12 parts filler, 2-4 parts maleic anhydride-grafted polypropylene, 0.1-0.2 parts antioxidant, and 0.2-0.4 parts lubricant. In this invention, waste oyster shells are the core rigid component. After activation, the surface microstructure becomes rough, and after furfural activation modification, the shell powder surface has a flexible structural layer that can deform during friction, absorbing and dispersing frictional energy. Walnut shell powder and cotton linters in the additives, after treatment with hydrochloric acid and sodium hydroxide, react with an aluminate coupling agent to form a lubricating buffer layer at the friction interface. These synergistic effects enable the sheath material to effectively disperse and dissipate shear stress when subjected to continuous friction from gravel and stones in the soil, increasing the wear resistance of the sheath material.

The invention discloses a preparation method of a cotton linter derived nanocellulose enhanced hydrogel plugging agent, and relates to the technical field of hydrogel plugging agent preparation, and the preparation method comprises the following steps: carrying out alkali boiling degreasing and bleaching treatment on cotton linter to obtain pretreated cotton linter; carrying out sulfuric acid hydrolysis and high-pressure homogenization treatment on the pretreated cotton linters to obtain nano cellulose dispersion liquid; carrying out TEMPO mediated oxidation treatment on the nano-cellulose dispersion liquid to obtain modified nano-cellulose of which the surface contains carboxyl; mixing the modified nano cellulose with acrylamide, N-isopropylacrylamide and sodium carboxymethyl cellulose, and adding multivalent metal salt to form a monomer premixed solution containing ionic crosslinking sites; loading an organic chromium cross-linking agent on the surface of the modified nanocellulose in the monomer premixed solution to construct a slow-release cross-linking system; and adding a redox initiator into the slow-release cross-linking system, mixing, injecting into the stratum, and carrying out in-situ free radical polymerization, nano-cellulose graft copolymerization, metal ion dynamic coordination and cross-linking agent slow release.

The utility model provides a dust remover for processing and producing high-viscosity cotton linters, which relates to the technical field of dust removers, and comprises a shell, an air inlet is fixedly arranged on the side surface of the shell, an air outlet is fixedly arranged on the other side of the shell, a precise filter screen is arranged in the shell, an activated carbon plate is arranged in the shell, and the activated carbon plate is arranged in the shell. According to the utility model, through the function of adjusting holes of the filter plate by the stop lever structure, the waste materials with different sizes can be accurately screened, the efficiency and the flexibility of waste material separation are improved, the scraper design can effectively clean the waste materials adhered to the filter plate, the blockage problem is avoided, the continuous operation of the equipment is ensured, and the production efficiency is improved. The application of the hot-air blower can quickly dry moist moisture in short-staple cotton, significantly reduce the situation of waste adhesion, improve the overall efficiency of filtration and dust removal, optimize the waste treatment process, make the dust removal effect more stable, and reduce the difficulty of cleaning and maintenance at the same time.

This invention discloses a cellulose cotton pulp for thermal insulation aerogel and its preparation method, belonging to the field of cellulose technology. The preparation method includes the following steps: Step 1, preparing a sodium hydroxide solution, adding cotton linters to the sodium hydroxide solution for ultrasonic-assisted preimpregnation to obtain a preimpregnated pulp; Step 2, transferring the preimpregnated pulp to a digester, preparing a composite cooking aid, adding the composite cooking aid to the digester, mixing well, and then cooking; Step 3, after cooking, releasing the gas, pulping using a pulping mill, followed by bleaching and washing; Step 4, adding a modifier to the washed pulp, stirring and reacting at 30-60℃ for 1-2 hours, and obtaining cellulose cotton pulp after the reaction. The modifier includes phytic acid-modified hydrotalcite and xylitol, with a mass ratio of 1:1-2. In preparing cellulose cotton pulp, this invention uses ultrasonic preimpregnation, a composite cooking aid to assist alkaline cooking, and modifier treatment to improve the mechanical strength of the cellulose.

The utility model discloses a velveteen removing device, and relates to the technical field of velveteen treatment. The device comprises a box body, a clearing mechanism is arranged in an inner cavity of the box body, and a screening mechanism is fixedly connected to the bottom of the inner cavity of the box body. According to the cotton seed cleaning device, the first motor is started, the first motor drives the first rotating rod to rotate, the first rotating rod drives the first gear to rotate, the first gear drives the second gear to rotate, the second gear drives the second rotating rod to rotate, the first rotating rod and the second rotating rod drive the cleaning roller to rotate at the same time, and cotton seeds are put into the box body; the cotton linter on the surfaces of the cotton seeds is removed under the rotating action of the cleaning roller, the cotton linter on the surfaces of the cotton seeds can be efficiently and thoroughly removed, the cotton linter removing efficiency and effect are greatly improved, the requirement for large-scale cotton seed processing is met, soft and elastic bristles are adopted in the cleaning roller, the cotton seeds cannot be damaged in the cotton linter removing process, and the cotton linter removing efficiency is improved. The completeness and the quality of the cotton seeds are effectively protected.

This invention belongs to the field of fiber cement board technology, specifically relating to a fiber cement board in which short cotton fibers replace wood pulp fibers and its preparation method. The fiber cement board prepared by using short cotton fibers to replace wood pulp fibers not only significantly reduces production costs, reduces the consumption of forest resources and the impact on the environment, but also maintains flexural strength comparable to traditional products, meeting the high standards of the construction industry.

The application discloses a kind of no addition super-soft water-jet fabric and its preparation method.The raw material of the application is regenerated cellulose fiber, including viscose, modal, lyocell in one or different proportions of mixed preparation, which is prepared by viscose, modal or lyocell process from 100% cotton pulp (cotton linter) as raw material, different from the fiber prepared from wood pulp as raw material.The above-mentioned fiber has low initial modulus, and the fiber itself is relatively soft, and the fiber is the basis for preparing super-soft water-jet fabric.Using different denier fibers, different softness of water-jet fabric can be prepared, and fine denier products have better softness.The patent uses the above-mentioned raw material, improves the carding machine and adjusts the configuration of the needle cloth, and repeatedly water-jet with multiple drums and multiple water-jet heads to prepare water-jet fabric with no addition super-soft, high water absorption and low fuzz and pilling.The product is green and environmentally friendly, biobased and biodegradable, and can be recycled and sustainable.

The application discloses a three-step deep impurity removal process for organic combed cotton raw materials and relates to the technical field of organic combed cotton raw material processing technology, which comprises the following steps: S1, pretreatment and preliminary impurity removal; S2, mechanical and chemical synergic impurity removal; and S3, fine screening and quality detection. In the application, through pretreatment and preliminary impurity removal, the raw materials are screened by using a wind screening device, large-particle impurities in the raw materials are removed through centrifugal treatment of the device, and residual tiny impurities are removed through electrostatic adsorption treatment, the two are complementary to each other, the type range of the removable impurities is greatly widened, the impurity removal is more comprehensive, the impurity removal efficiency of the whole pretreatment and preliminary impurity removal stage is improved, multiple steaming is not needed, the processing time can be reduced, the influence on the fiber strength and hand feeling is reduced, and thus the quality and performance of the raw materials are ensured. Through mechanical and chemical synergic impurity removal, the combed cotton linters after carding are soaked under low-temperature conditions, impurities can be effectively removed, and the damage to the organic cotton fibers can be reduced.

The invention relates to the technical field of membrane separation, in particular to a regenerated cellulose ultrafiltration membrane with acid and alkali resistance and pollution resistance as well as a preparation method and application thereof, and aims to solve the problems of flux attenuation and short service life caused by poor chemical stability and easiness in oil pollution of an existing polymer ultrafiltration membrane under an extreme pH condition. The preparation method is characterized in that cotton linter or cotton pulp is taken as a raw material, cellulose is dissolved at low temperature by adopting a pre-cooled alkali / urea / thiourea aqueous solution system, after defoaming and membrane scraping, regeneration forming is performed in a specific coagulating bath, and finally the finished ultrafiltration membrane is obtained through freeze drying. The method is simple in process, green and environment-friendly. The prepared regenerated cellulose ultrafiltration membrane has the characteristics of excellent acid and alkali resistance (stable performance within the pH range of 1-14), high oil pollution resistance (the water flux recovery rate is greater than 90%), adjustable structure and performance (the average pore size is 12-76 nm) and the like, and is particularly suitable for treating industrial oily wastewater with complex components.

This invention discloses a high-efficiency closed-pore bio-based hard carbon anode material and its preparation method, belonging to the technical field of sodium-ion battery anode materials. The material is prepared from cellulose-based biomass such as cotton linters, bamboo fiber, and lignin through organic solvent extraction pretreatment, composite molten salt coating granulation, inert atmosphere gradient pyrolysis, and low-temperature hydrogen reduction post-treatment. It features a curved closed-pore nanostructure internally and a dense amorphous carbon layer on the surface. This invention utilizes a three-pronged synergistic process of extraction impurity removal, molten salt confined pyrolysis, and low-temperature reduction to precisely control the pore structure and deeply remove oxygen-containing functional groups, effectively solving problems such as low initial coulombic efficiency, poor pore structure control, incomplete removal of oxygen-containing functional groups, and reversible capacity decay in traditional bio-based hard carbon materials. The resulting anode material exhibits excellent rate performance and cycle life, with a green process, renewable raw materials, and suitability for large-scale production, making it highly valuable for application in the sodium-ion battery energy storage field.

The invention provides a method for modifying a hydraulic oil purification glass fiber filter membrane based on a surface micro-nano rough structure, and relates to the technical field of filter membrane modified.The method comprises the steps that superfine glass fibers with the average diameter smaller than or equal to 4 micrometers are adopted as main fibers, 5%-20% by mass of double-melting-point plant fibers and 1%-10% by mass of shear response reinforced resin are added, glass fiber composite fiber slurry is prepared, and the glass fiber composite fiber slurry is prepared; wherein the double-melting-point plant fiber is selected from one or more of softwood pulp, hardwood pulp, self-boiled cotton stalk pulp and cotton linter, the shear response reinforced resin is polyurethane-epoxy hybrid resin, a quantitative 50-200g / m glass fiber filter membrane base material is obtained through wet forming, a TiO2 nanorod array is grown in situ through a hydrothermal combined differential etching process, and the glass fiber filter membrane is prepared. And a ternary hybrid solution is combined to construct a secondary coarse structure layer, so that ordered construction of a micro-nano hierarchical coarse structure on the surface of the filter membrane is realized, the hydrophobic and oleophylic properties are improved, and the capture of micron-sized water drops and the oil-water separation efficiency are effectively improved.

This invention discloses a medical test paper pulp and its production method, belonging to the field of test paper production technology. The method uses a type of short cotton lint, which is mixed with a cooking liquor with an alkali concentration of 65-75 g / L and cooked to obtain a pulp with a degree of polymerization in the range of 400-500. The pulp is then refined using a pulping machine to maintain a fiber length of 2.0-3.0 mm. After bleaching with chlorine dioxide, washing with an acid concentration of 0.8-1.0 g / L, and water washing, the residual acid concentration after washing is <0.05 g / L. The final pulp is then obtained after papermaking. Compared with existing technologies, the cotton pulp prepared by the method provided by this invention has higher water absorption, and the test paper has a fixed weight of 280 g / m³. 2 Filtration time 3s, whiteness 89%–91%, dust-free, cellulose content 98.5%–99.2%, ash content 0.01%, beating degree 28. ° SR can replace imported cotton pulp in the production of rapid medical test strips.