Patent ID: 6315934
Filing Date: 2001-11-13
Classification: B01D,F17C,Y02C

Abstract:
A process for preparing bulk continuous fiber yarn from poly(trimethylene terephthalate) comprising:(a) melt-spinning poly(trimethylene terephthalate) at a temperature within the range of about 250 to about 280.degree. C. to produce a plurality of spun filaments;(b) cooling the spun filaments;(c) converging the spun filaments into a yarn;(d) drawing the yarn at a first draw ratio within the range of about 1.01 to about 2 in a first drawing stage defined by at least one feed roller and at least one first draw roller, each of said at least one feed roller being unheated and each of said at least one draw roller heated to a temperature within the range of about 50 to about 150.degree. C.;(e) subsequently drawing the yarn at a second draw ratio of at least about 2.2 times that of the first draw ratio in a second drawing stage defined by said at least one first draw roller and at least one second draw roller, each of said at least one second draw roller heated to a temperature greater than said at least one first draw roller and within the range of about 100 to about 200.degree. C.; and(f) winding the drawn yarn.