PRODUCTION OF SPONTANEOUSLY CRIMPING DRY-SPUN POLYACRYLONITRILE OSITE FILAMENTS

摘要

PROCESS FOR THE PRODUCTION OF SPONTANEOUSLY CRIMPING POLYACRYLONITRILE COMPOSITE FIBRES WITH IMPROVED CRIMP PROPERTIES The invention relates to a process for the production of spontaneously crimping composite fibres of acrylonitrile polymers wherein the dry-spun-filaments which still contain solvent are stretched to at least three times their original length in a bath of hot water which contains from 12 to 30 % by weight of dimethyl formamide. The stretching operation may be carried out in one or two stages.