The wet spinning of secondary cellulose acetate: Solution rheology and filament spinnability

Abstract

The flow behaviour of a series of solutions of secondary cellulose acetate were examined in detail using a Weissenberg rheogoniometer. The solutions were then wet spun into solid filaments and their tensile properties examined. Filament spinnability was found to go through a maximum at a concentration of about 12.5 to 15 per cent of cellulose acetate in the spinning solution. It appeared that the rheological properties of the spinning solution did not exert any direct effect on filament spinnability, and that the flow behaviour of the liquid filament in the process of coagulating might be critical.