Patent ID: 6109015
Filing Date: 2000-08-29
Classification: D01D,D01F,Y10S

Abstract:
A method of producing a poly(trimethylene terephthalate) yarn which resists physical aging and is useful in the fabrication of carpeting and pile fabrics which comprises the steps of:(a) feeding poly(trimethylene) terephthalate polymer chip to a melt extrusion apparatus wherein said polymer is melted, mixed and extruded through a spinneret to form filaments,(b) cooling said filaments formed in step (a) using air flowing perpendicularly to the movement of said filaments,(c) coating the cooled filaments provided in step (b) to form coated filaments,(d) passing said coated filaments between an unheated feed roll and a tension roll so as to tension said coated filaments provided in step (c) without causing said filaments to undergo any permanent stretching,(e) passing said tensioned filaments provided in step (d) between said tension roll and a heated draw roll to draw said tensioned filaments in a single draw step to a draw ratio of between 1.25 and 4.0 and to heat said drawn filaments to a temperature treater than said class transition temperature of said filaments and less than the crystallization temperature thereof, and(f) winding said drawn and heated filaments on a winding device.