METHOD FOR PRODUCING POLYPROPYLENE ELASTIC FIBER AND POLYPROPYLENE ELASTIC FIBER

摘要

Disclosed is a method for producing an elastic fiber comprising: a step of melt-extruding a raw material at 100-300°C using a spinning nozzle; a step of cooling the melt-extruded fiber in water bath of 0-50°C; and a step of winding up the cooled fiber.  The method for producing an elastic fiber uses a specific low-crystalline polypropylene as the raw material.  Also disclosed is an elastic fiber of a sheath-core bicomponent structure using a specific low-crystalline polypropylene.