A Model for Dry-Wet Spinning of Cellulose Fibers

Polymeric fibers are manufactured by spinning from polymer melts or solutions. For the latter, coagulation occurs through precipitating in liquid bath (wet spinning) or evaporating the solvent in air (dry spinning). Recent development of dry-wet spinning combines the two coagulation mechanisms, resulting in better control of spinning cellulose fibers from ionic liquid solutions. We discuss the mechanism of dry-wet spinning in general terms using a model that incorporates both constitutive equations of fluid dyanmics and continuouse structural transformation during two stages of spinning processes.