THERMALLY EXTENSIBLE FIBER

摘要

A thermally extensible fiber obtained by heat-treating or crimping a conjugated fiber which is composed of the first resin component having an orientation index of 30 to 70% and the second resin component having a melting or softening point lower than the melting point of the first resin component and an orientation index of 40% or above and in which the second resin component exists continuously in the lengthwise direction of the fiber in such a state as to constitute at least part of the surface of the fiber. The thermally extensible fiber can be extended under heating at a temperature lower than the melting point of the first resin component and exhibits thermal self extension higher than those of conventional extensible fibers.