Production manner null of high contractile Characteristic acrylic fiber for high pile

摘要

PURPOSE: To industrially easily and stably obtain an acrylic fiber sensitive to dry heat and having excellent fast shrinkability and high shrinkability. ;CONSTITUTION: When a highly shrinkable acrylic fiber comprising an acrylonitrile polymer produced from 90-95wt.% of acrylonitrile, 0-0.5wt.% of a sulfonic acid group-containing vinylic monomer and 10-4.5wt.% of another monomer, having a shrinkage degree of ≥30% after heated at 130°C in a dry-heated atmosphere under no load for 10min, the maximum value of the thermal shrinkage stress measured under a temperature-increasing atmosphere of 10°C/min in the temperature range of 90-130°C and the maximum thermal shrinkage stress value of 1100mg/d, is produced by a wet-spinning method, the spinning of the fiber, the drawing of the spun fiber into the length of 2-6 times, the dry- thickening of the drawn fiber, the shrinking relaxation of ≥30% in a compressed stream atmosphere and the dry-heat drawing of the fiber into the length of 1.6-2.2 times, are successively performed.;COPYRIGHT: (C)1996,JPO