Melt-spun multifilament polyolefin yarn formation processes and yarns formed therefrom
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United States of America Patent
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Nov 4, 2008
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N/A
app pub date -
May 22, 2006
filing date -
Nov 5, 2004
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Abstract
Disclosed is a method of forming multifilament polyolefin yarns and yarns formed according to the disclosed method. The yarns can be polypropylene yarns and can exhibit any of a high modulus, high tenacity, and a unique crystalline structure for multifilament polyolefin yarns. The process can generally include extruding a polymeric melt including the polyolefin at a relatively high throughput and low spinline tension and quenching the filaments in a liquid bath prior to drawing the fiber bundle at a relatively high draw ratio, for example greater than 10, in some embodiments.
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