Method for producing polyester-based combined filament yarn
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United States of America Patent
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Apr 20, 2004
Grant Date -
N/A
app pub date -
Jul 17, 2001
filing date -
Jan 25, 1999
priority date (Note) -
Expired
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Abstract
A polymer of a kind different from a polyester in an amount within the range of 0.3 to 5.0% by weight based on the polyester is added to the polyester, and the resulting composition is melt-extruded from the same pack. The extruded filament group including polyester multi-filaments is cooled once to the glass transition temperature or below, and the filament group is subsequently divided into two groups. One of the filament groups in an opened state is subjected to non-contact heat treatment at an atmospheric temperature of 120.degree. C. or above; however, the other filament group is kept in a state without being subjected to the heat treatment. The respective filament groups are then simultaneously taken off at a speed of 2500 m/min or above and subjected to doubling and mixing of the filaments.
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