The main raw material of acetate fiber tow is natural plant cellulose, usually taken from cotton linters or wood pulp. This type of raw material itself has a high cellulose content and can be converted into cellulose acetate after chemical treatment. It is the core material for preparing tow.
Production process
Raw material preparation
Pre-process the selected cotton linters or wood pulp (such as removing impurities, drying, etc.) to ensure that the cellulose purity meets industrial standards.
Esterification reaction
Cellulose is reacted with acetic acid, acetic anhydride and a small amount of catalyst to produce cellulose triacetate. This process is carried out in a closed reactor, and the reaction temperature and time are strictly controlled.
Hydrolysis adjustment
Cellulose triacetate is reacted with water or dilute acid to partially hydrolyze into cellulose diacetate and adjust its degree of substitution for subsequent dissolution and spinning operations.
Dissolution and spinning solution preparation
Cellulose diacetate is dissolved in a mixed solvent (mainly acetic acid and acetone) to prepare a spinning solution of a certain viscosity, and impurities are removed by filtering.
Dry spinning
Dry spinning is a process where the spinning solution is extruded through a spinneret and the solvent evaporates in a heated air flow to form filaments.
Tow assembly and drawing
Combining filaments into tows and drawing them to improve the orientation and mechanical properties of the fibers
Oiling treatment
In order to improve the subsequent processing performance, the surface of the tow is oiled. Commonly used oils include antistatic agents, lubricants, etc.
Winding and packaging: Winding, cutting or packaging the processed yarn into standard products for easy transportation and subsequent processing.
Performance characteristics
Good hydrophilicity and adsorption properties
The fiber surface has high hydrophilicity, which can effectively absorb moisture and particles in smoke, and help filter impurities
Soft and comfortable feel
The fiber is fine, smooth and soft to the touch, suitable for high-end textile and personal care products.
Good processability
Tow length and fiber diameter can be customized, with good cuttability, formability and compositeness
Environmental protection and biodegradability
Acetate fiber is derived from natural plants and has excellent biodegradability, meeting the needs of green and sustainable development.
Good thermoplasticity
It has good formability at a certain temperature and is suitable for processing methods such as hot pressing and welding.
Stable structure and high quality finished product
It shows good structural retention and consistency in cigarette filter manufacturing, which helps control the draw resistance and ventilation rate.
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