During dry-wet spinning, diffusion is very important for the formation and mechanical property of fibers. In this paper, the diffusion dynamics of acetic acid (HAc) and water (H2O) during coagulation process of cellulose acetate filament were investigated in detail. The diffusion coefficients of HAc and H2O were calculated based on the Ficks first law of diffusion according to the experimental data. Several factors which affect the coagulation process including concentration and temperature of coagulation bath were discussed respectively. The result showed that the diffusion coefficients of HAc and H2O increased with the increasing coagulation temperature and decreased with the increasing coagulation bath concentration.
STUDIES ON THE SIZING OF ACETATE FILAMENT YARN