Sazhuoke spinning polyurethane composite wet spinning forming single filament, composite filament, hollow fiber small desktop equipment

The wet spinning process of polyurethane multifilament is a technique for preparing high-performance fibers through solution spinning, which relies on the dual diffusion phase separation mechanism of solvent coagulation bath.

The raw liquid is extruded from the nozzle and enters the coagulation bath, where the solvent and coagulant undergo bidirectional diffusion, resulting in the precipitation of polymer concentrate and the formation of primary fibers. This process follows the double diffusion theory and is regulated by the temperature and concentration gradient of the coagulation bath.