| 摘要 |
PURPOSE:To obtain the titled fiber having high strength and elongation comparable to drawn fiber and excellent shrinkage property comparable to POY, by extruding molten polyester through a spinneret into a hot atmosphere, cooling and solidifying the fiber, reheating under a specific condition and taking up at a specific speed. CONSTITUTION:A molten polyester containing ethylene terephthalate as main recurring unit is extruded through a spinneret into an atmosphere maintained at >=200 deg.C and having a heating zone length of preferably >=13cm, especially >=15cm. The fiber passed through the hot atmosphere is solidified by cooling and reheated by passing through an atmosphere extending over 80-200cm along the running direction of the fiber and heated at 120-160 deg.C. A hgih- shrinkage polyester fiber having a birefringence of >0.130 and <=0.165, a boiling water shrinkage of >=30%, a peak temperature of thermal stress of 90-105%oC and a peak value of >=0.4g/de can be produced by this process.
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