Patent ID: 6835339
Filing Date: 2004-12-28
Classification: D01D,D01F,Y10T

Abstract:
A process of making a polytrimethylene terephthalate staple fibers having a tetrachannel cross-section, comprising (a) providing polytrimethylene terephthalate, (b) melt spinning the melted polytrimethylene terephthalate at a temperature of 245-285Â° C. into filaments, (c) quenching the filaments, (d) drawing the quenched filaments, (e) crimping the drawn filaments using a mechanical crimper, (f) relaxing the crimped filaments at a temperature of 50-120Â° C., and (g) cutting the relaxed filaments into staple fibers having a length of about 0.2-6 inches (about 0.5-about 15 cm) and the tetrachannel cross-section.