Gel Spinning from Cellulose/Aqueous Calcium Thiocyanate System and the Fiber Properties.

Abstract

: For the purpose to develop regenerated cellulose fiber with high dry and wet tenacity, we tried gel spinning from cellulose/aqueous calcium thiocyanate solution system. The system at 125°C was extruded into air at 10°C under various spinning draft, followed by extraction of the solvent using acetone or ethanol.The fiber served to the measurements of dry and wet tensile properties, birefringence, and fibrillation resistance grade. The degree of the orientation and strength under wet and dry states monotonically increased with an increase of spinning draft. The filament spun at the draft of 6 showed the highest wet/dry tenacity ratio (=0.96) among those of other commercially available regenerated cellulose fibers. The fibrillation resistance grade as well as dry/wet tenacity were also greater than those of cupra and lyocel for textile use.