Method of and apparatus for the production of polyester yarn
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United States of America Patent
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Nov 21, 2000
Grant Date -
N/A
app pub date -
Apr 2, 1999
filing date -
Apr 17, 1998
priority date (Note) -
Expired
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Abstract
Polyester yarn is made by melt spinning the polyester filaments which are then cooled at least to solidification and heated by counterflow with prestretching to a crystallinity in excess of 24%. The prestretched filaments are gathered and stretched to after-stretching at a temperature of 80.degree. C. to 250.degree. C. to a final titer of 1.0 dtex to 7.5 dtex with a stretching ratio of 1:1.5 to 1:1.15. The yarn is then wound up at a rate of 5000 to 8000 m/min.
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