PROCESS FOR PRODUCING ACRYLIC COMPOSITE FIBERS HAVING WOOLLY CRIMP CHARACTERISTICS

摘要

A process for producing acrylic composite fibers having woolly crimp characteristics by compositely wet-spinning two kinds of acrylonitrilic polymers each of which contains not less than 88% by weight acrylonitrile and which are different from each other in acrylonitrile content by not less than 0.5%, initially heat relaxing the obtained swollen gelly fibers containing at least 40% water in hot water or steam in a non-tensioned state without drying them so as to form them into composite fibers in which the irreversible swelling degree of the component higher in acrylonitrile content is higher than that of the other component by not less than 0.05 and said component higher in irreversible swelling degree forms the inside component of the coily crimp, then drying the composite fibers, re-stretching them, mechanically crimping them and then re-heat-relaxing the thus prepared composite fibers in steam.