The structure of acetate fiber tow mainly includes its morphological structure, thermal properties, mechanical properties, filtration and adsorption properties, dyeing properties and chemical stability.
Morphological structure
The longitudinal surface of acetate fiber is smooth, but with obvious grooves, the cross section is clover-leaf-shaped, with a small amount of serrations around it, and no skin-core structure. This unique morphological structure makes acetate fiber have certain particularities in preparation methods and process conditions.
Thermal properties
As an amorphous polymer, acetate fiber will change its shape and mechanical properties when heated or under different temperature conditions. When the temperature reaches its melting point, acetate fiber enters the thermal decomposition stage, so it cannot be directly melt-processed.
Mechanical properties
The dry strength of acetate fiber is smaller than that of viscose and polyester, and the strength loss in wet state is larger. The residual strength is about 70% of the dry strength, and the elongation at break changes greatly in dry and wet states.
Filtration and adsorption properties
When acetate fiber is used as a filter material, the capture of particulate matter mainly includes direct interception, inertial collision, diffusion deposition, gravity effect and electrostatic effect. In addition, acetate fiber also shows selective filtration and adsorption capacity for cigarette tar.
Dyeing properties
Acetate fiber is mostly dyed with disperse dyes. The conditions during the dyeing process should be controlled in a medium temperature and weak acid environment. It is best to use a wide-width jigger or a normal pressure warp dyeing machine for dyeing.
Chemical stability
Acetate fiber has a certain acid resistance, but it will hydrolyze under concentrated acid conditions. Reducing agents and low-concentration oxidants have little effect on acetate fiber.