COMPOSITE FIBER AND PROCESS FOR PRODUCING THE SAME

摘要

A polytrimethylene terephthalate composite fiber characterized in that it is composed of a group of single yarns united into a side-by-side structure or eccentric core-sheath structure and is made of two polyester ingredients, that at least one of the ingredients constituting the single yarns is polytrimethylene terephthalate, and that (1) the fiber is crimpy before treatment with boiling water and, the crimped fiber has a degree of stretching elongation of 20% or less, (2) the elongation at break is 25 to 100%, and (3) the extreme value of dry heat shrinkage stress is 0.01 to 0.24 cN/dtex.