| 摘要 |
PROBLEM TO BE SOLVED: To provide a production process for polyester fiber for friction false- twisting that can stably melt-extruding polyester including an elongation- increasing agent at an increased speed with no occurrence of defective traverse and cop trouble and can produce polyester fiber that can be stably friction false-twisted at an increased speed with extremely reduced fluffing and yarn breakage. SOLUTION: When a mixture of polyester and 0.5-4.0 wt.%, based on the polyester, of an elongation-increasing polymer incompatible to the polyester is melt-extruded at a speed of 2,500-8,000 m/min, a treatment agent that includes 60-98 wt.% of an ethylene oxide/propylene oxide copolymeric polyether lubricant in which the weight ratio of the ethylene oxide to the propylene oxide is 80/20-20/80 and the average molecular of the copolymer is 1,000-10,000 is applied to the polyester fiber in an amount of 0.2-0.5 wt.% based on the fiber weight. |
