Chemical structure: Through the reaction of acetic anhydride and cellulose hydroxyl groups, the degree of substitution (DS) is usually between 2.2 and 2.8, giving the material good solubility and thermoplasticity.
Physical form: It appears as white or light-colored filamentous bundles, with a fiber diameter range of 10 to 30 microns, and the length can be customized according to demand (usually tens of meters to thousands of meters).
Production process
Cellulose purification: Wood pulp or cotton pulp is bleached and treated to remove impurities to ensure that the α-cellulose content is greater than 95%.
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Acetylation reaction: Under the catalysis of sulfuric acid, cellulose reacts with acetic anhydride to produce cellulose acetate.
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Dissolution: Cellulose acetate is dissolved in acetone or dichloromethane to form a viscous spinning solution.
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Dry spinning: The solution is extruded through a spinneret and the solvent evaporates to form continuous fibers.
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Drawing and shaping: The fibers are thermally stretched to increase their strength and finally wound into bundles.
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product key technologies
Physical and chemical properties
Heat resistance: softening point 230~260℃, suitable for high temperature processing environment.
Hygroscopicity: equilibrium moisture regain 4%~6%, better than synthetic fibers (such as polyester).
Biocompatibility: non-toxic, passed ISO 10993 medical device biocompatibility certification.
Functional advantages
High-efficiency filtration: The porous structure can absorb 0.5~5 micron particles, and the PM2.5 filtration efficiency is >90%.
Degradability: Decomposes in 1~3 years in the natural environment, in line with the EU EN 13432 composting standard.
Processing adaptability: Easy to compound with resin, supports various molding processes such as injection molding and hot pressing.
Main application areas
Tobacco industry (core market)
Cigarette filters: 70% of the world's acetate fiber tow is used in this field, which can effectively intercept tar and nicotine.
Innovative products: low permeability filter (for slim cigarettes), composite activated carbon filter rods.
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Medical and health care
Medical dressings: The antibacterial treated tow is used for wound care, and its air permeability is better than that of traditional gauze.
Dialysis membrane materials: High-purity tow is used to prepare hollow fibers for blood purification equipment.
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Industry and Environmental Protection
Air Filtration: High-efficiency filter element for HVAC system, resistant to humidity and organic solvents.
Water Treatment: Composite membrane support layer material, excellent anti-pollution performance.
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Textiles and daily chemicals
High-end clothing: blended with silk to create drapey and wrinkle-resistant fabrics.
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