| 摘要 |
PROBLEM TO BE SOLVED: To provide a production method for a hot stretchable polyester fiber capable of obtaining a cloth having a soft touch feeling after weaving or knitting, by carrying out a hot stretching treatment of a polyester-based un-non- stretching fiber under a specific condition, and also applicable to the production of hot stretchable fiber from other various lowly oriented non-stretching fibers. SOLUTION: This method for producing a hot stretchable polyester fiber is to heat-treat a polyester-based non-stretching fiber having >=45%ε0.2 structure uniformity parameter at >=Tg+50 deg.C, while stretching the same between a first roller 3 heated at (Tg+30) to (Tm-100) deg.C and a second roller 5 through a heater 4. The stretching ratio between the rollers 3, 5 is made as >=80% of that at break thereof.
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