Patent ID: 6872352

Claim:
A process of making a web or batt comprising polytrimethylene terephthalate staple fibers, comprising (a) providing polytrimethylene terephthalate, (b) melt spinning the melted polytrimethylene terephthalate at a temperature of 245-285° C. into filaments, (c) quenching the filaments, (d) drawing the quenched filaments, (e) crimping the drawn filaments using a mechanical crimper at a crimp level of 8-30 crimps per inch, (f) relaxing the crimped filaments at a temperature of 50-130° C., (g) cutting the relaxed filaments into staple fibers having a length of about 0.2-6 inches, (h) garnetting or carding the staple fibers to form a web and (i) optionally cross-lapping the web to form a batt.