PRODUCTION METHOD OF HIGH FLEXIBILITY ELASTIC YARN

摘要

PURPOSE: A production method of a high elastic yarn is provided to thermal-treat under 30°C of the melting temperature around the glass transfer temperature of the PBT of a hardened segment. CONSTITUTION: The high elastic yarn is produced by thermal-treating in the state not to be suspended a tension after melting and spinning the polyether ester copolymer having the polyether of the PBT as a hardened segment and the polyether of the polytetramethylene ether glycol as a soft segment. The polyether ester is comprised by the polyester of the polybutylene terephthalate as a hardened segment, and the polyester of the polyalkylether glycol as a soft segment.