Spin draw process of making partially oriented yarns from polytrimethylene terephthalate
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United States of America Patent
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May 25, 2004
Grant Date -
Sep 19, 2002
app pub date -
Oct 3, 2001
filing date -
Oct 10, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention is a spin draw process for making partially oriented yarn from polytrimethylene terephthalate (PTT) which comprises the steps of: (a) extruding and spinning PTT in forming a monofilament or multifilament yarn therefrom, (b) heating the yarn by contacting it with a first pair of godets moving at a speed in and at a temperature set to give a yarn temperature above the glass transition temperature and less than the cold crystallization temperature of PTT, (c) drawing the yarn between the first godet pair and a second pair of godets moving at a speed and a temperature of from 45 to 120.degree. C. and having a draw ratio of 0.7 to 3.0, and (d) winding the yarns at the speed of 1 to 15% less than that of the second godet pair at a yarn temperature less than the glass transition temperature of PTT yarn.
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