Process for preparing poly(trimethylene terephthalate) staple fibers for conversion into carpets
OwnerHoe Hin Chuah, Jerry Wayne Secristinventors
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Abstract
This invention is a process for the production of staple fibers from poly(trimethylene terephthalate) for conversion into carpets which comprises: (a) extruding poly(trimethylene terephthalate) at a melt temperature of 240 to 280° C. into round, trilobal, delta, multi-lobal, or hollow cross section staple fiber tow, (b) quenching the fiber tow such that the undrawn filament tow has a crystallinity of ≦25%, preferably ≦20%, (c) prior to drawing, heating the fiber tow to temperature of 35° C. to 65° C., preferably between 35 and 55° C., to control crystallization, and (d) drawing the staple fiber tow into staple fibers.
Claims17
A process for the production of staple fibers from poly(trimethylene terephthalate) for conversion into carpets which comprises:
- (a) extruding poly(trimethylene terephthalate) at a melt temperature of 240 to 280° C. into staple fiber tow,
- (b) quenching the fiber tow such that the undrawn filament tow has a crystallinity of less than or equal to 25%,
- (c) prior to drawing, heating the fiber tow to temperature of 35° C. to 65° C., and
- (d) drawing the staple fiber tow into staple fibers.
Dependencies are inferred from the claim text.