Material composition: Produced by acetylation reaction of wood pulp or cotton linters, containing acetyl groups (CH₃COO–), with a degree of substitution of about 2.2-2.7.
Physical form: White or light yellow filament bundles, single filament diameter 10-30 microns, length can be customized (usually thousands of meters of continuous filaments).
Key performance:
High adsorption: can intercept harmful substances such as cigarette tar and nicotine.
Thermoplasticity: can be melted and molded when heated to 200-250°C, suitable for high-speed filter rod production.
Biodegradability: better than synthetic fibers (such as polypropylene), but slower than natural cellulose.
Packing: moisture-proof carton
Production process
The manufacture of acetate fiber tow is divided into three stages: cellulose acetylation, spinning, and post-processing:
Raw material pretreatment:
Wood pulp is impregnated with alkali to remove lignin and obtain α-cellulose (purity>95%).
Acetylation reaction:
Under the catalysis of sulfuric acid, it reacts with acetic anhydride to produce cellulose acetate (the degree of substitution needs to be controlled to adjust the solubility).
Spinning:
Dissolved in acetone/water mixed solvent, extruded through a spinneret, and cured by hot air to form continuous filaments.
Post-processing:
Twisting and curling: Improve fiber cohesion and adapt to filter rod forming machines.
Plasticization treatment: Add triacetin to enhance flexibility.
Main application areas
Tobacco industry (core market)
Cigarette filters: account for more than 85% of the global use of acetate fiber tow, which can reduce tar content by 30%-50%.
Ultra-fine filter: used for e-cigarettes or low-temperature heated cigarettes (HNB).
Composite filter element: mixed with activated carbon and PLA fiber to improve filtration efficiency.
Textile and clothing
High-end fabrics: imitation silk texture, used for dresses and linings (good breathability but lower strength than cotton).
Functional fibers: antibacterial and UV-resistant modified varieties.
Medical and industrial
Wound dressings: high biocompatibility, can promote healing.
Dialysis membrane materials: use their semi-permeability to filter blood toxins.
Environmental protection and health
Degradation problem: It takes 2-5 years to degrade in the natural environment, and microfibers may enter the soil/water.
Recycling technology:
Chemical recycling: hydrolysis regeneration of cellulose acetate, but the cost is high.
Physical regranulation: used for low-end plastic products.
Core Features
High purity and low impurity content
Use high-purity wood pulp or cotton pulp as raw materials to ensure sufficient acetylation reaction of cellulose and reduce unreacted residues.
Low ash content (≤0.1%) and low free acid content to avoid adverse effects on subsequent processing or end products (such as cigarette filters).
01
Excellent fiber uniformity
Strictly control the fiber denier, common specifications are 1.5D, 2.0D, 3.0D, etc., to meet different filtration efficiency requirements.
The fiber cross section has a regular serrated structure, which increases the specific surface area and enhances adsorption and filtration performance.
02
Excellent processing performance
The high degree of fiber opening facilitates high-speed spinning or filter rod forming.
Antistatic treatment reduces fiber scattering and entanglement during production.
03
Environmental protection and biodegradability
Acetate fiber is derived from natural cellulose and can be degraded by microorganisms in the natural environment, complying with environmental regulations such as EU REACH and FDA.
No toxic smoke is released when burning, suitable for food and medical grade applications.
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