Process for making poly(trimethylene terephthalate) yarn
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United States of America Patent
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Aug 29, 2000
Grant Date -
N/A
app pub date -
Jul 7, 1998
filing date -
Apr 9, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a method of producing poly(trimethylene terephthalate) yarn from PTT chip which has been extruded through a spinneret into filaments and coated, the coated filaments are passed between an unheated feed roll and a tension roll to tension them without causing permanent stretching, and then are passed from the tension roll to a heated draw roll to draw the filaments in a single draw step to a draw ratio of 1.25 to 4.0 and to heat them to a temperature between their glass transition temperature and their crystallization temperature.
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