| 摘要 |
PROBLEM TO BE SOLVED: To obtain wear resistant polylactic acid-based fibers having high strength and biodegradability and excellent dimensional stability and useful for a woven and knitted fabric, etc., by melt spinning a polylactic acid-based polymer, adjusting moisture content of as-spun fiber to below a prescribed value and heat-drawing. SOLUTION: The objective wear resistant polylactic acid-based fibers having >=4.0 g/d strength and >=5,000 times wear resistance of (fiber/fiber) are obtained by melt spinning a polylactic acid-based polymer having >=95% optical purity, 1-50 g/10 min melt flow rate, adjusting moisture content of as-spun fiber to <=3%, then subjecting to multistage heat-drawing at (Tm-60)-(Tm-10) deg.C (Tm is melting point of polymer). Preferably, the heat-drawing is performed by using superheated air or superheated steam as a heating medium.
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