| abstract |
The thermally extensible fiber is composed of a first resin component having an orientation index of 30 to 70% and a second resin component having a melting point or softening point lower than the melting point of the first resin component and having an orientation index of 40% or more. The bicomponent resin consists of a composite fiber in which at least part of the fiber surface is continuously present in the longitudinal direction. The fibers are subjected to heat treatment or crimping treatment, and are capable of being stretched by heat at a temperature lower than the melting point of the first resin component. This thermally extensible fiber has a high self-extension by heat compared with the conventional extensible fiber.n n n n Resin component, composite fiber, heat extensible fiber, nonwoven fabric, melt spinning, heat treatment, crimp treatment |