Basic characteristics
Material composition: Cellulose acetate (cellulose diacetate or triacetate)
Form: White or translucent continuous filaments, monofilament fineness is usually 1.5-8 denier
Key indicators: total denier (such as 30,000 denier), cross-sectional shape (Y-type, zigzag type, etc.), plasticizer content
Environmental protection: Some types can be hydrolyzed and degraded, but traditional acetate fibers degrade slowly in the natural environment
Production process
Raw material preparation
Wood pulp or cotton linters: high-purity α-cellulose (≥95%)
Acetic anhydride: main reagent for acetylation reaction
Solvent: acetone or dichloromethane (for dissolving cellulose acetate)
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Acetylation reaction: Cellulose reacts with acetic anhydride in the presence of a catalyst (such as sulfuric acid) to produce cellulose acetate.
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Spinning molding
Dry spinning: Cellulose acetate solution is extruded through a spinneret, and the solvent is evaporated by hot air to form continuous fibers.
Tow molding: Multiple single fibers are assembled into bundles, and a three-dimensional curling structure is given by a crimping machine to enhance filtration efficiency.
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Post-processing
Plasticizer addition: such as triacetin, to improve the flexibility and adhesion of the yarn bundle.
Forming and cutting: adjust the yarn bundle denier (such as 3,000 denier/bundle) according to customer needs and package.
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Functional advantages
High-efficiency filtration: The curled structure of the fiber can intercept tar and particulate matter (cigarette filter PM2.5 interception rate> 50%)
Non-toxic and safe: meets FDA and EU TPDA food contact material standards.
Adjustable performance: Optimize suction resistance and filtration efficiency by changing the fiber size and cross-sectional shape (such as Y-type).
Application Areas
Cigarette filters: more than 90% of global acetate tow usage
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High-end fabrics: imitation silk, lining cloth (triacetate fiber is required for better heat resistance).
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Medical materials: surgical gowns, mask filter layers (antibacterial treatment required).
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Biodegradable materials: Modified acetate fiber for environmentally friendly packaging (such as PLA blending)
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Industrial filter materials: oil filtration, air purification, etc.
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