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Process for preparing poly(trimethylene terephthalate) carpet yarn

  • US 6,113,825 A
  • Filed: 11/13/1997
  • Issued: 09/05/2000
  • Est. Priority Date: 05/08/1995
  • Status: Expired due to Fees
First Claim
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1. 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°

    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 operated at a temperature less than about 100°

    C. and each of said at least one draw roller heated to a temperature greater than the temperature of said at least one feed roller and within the range of about 50 to about 150°

    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°

    C.; and

    (f) winding the drawn yarn.

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