Abstract
The effects of hole-diameter and the extrusion velocity on the maximum draft, at which all filaments break, were studied with spinometer and ammonium sulfate coagulation bath, to avoid the influence of regeneration of cellulose. The results are as follows:
1) The maximum draft is determined mainly by the linear extrusion velocity, regardless of hole-diameter or delivery volume.
2) Müller's bath gives slightly higher maximum draft than ammonium sulfate bath, but shows similar behavior. Therefore, the regeneration affects slightly on the maximum draft ratio.
3) The maximum draft shows nearly parallel correlation with the spinnability and may be applicable as the qualitative measure.
