POLYESTER CONJUGATED FIBER

摘要

PURPOSE:To provide a polyester fiber exhibiting a relatively large fineness and excellent in pill resistance. CONSTITUTION:This sheath-core type polyester conjugated fiber is a staple fiber produced by applying an alkaline hydrolysis treatment to a polyester conjugated staple fiber composed of a readily hydrolyzable core part of a polyester component composed mainly of ethylene terephthalate unit and a scarcely hydrolyzable sheath part of a polyester component substantiously composed of ethylene terephthalate unit and surrounding the core part. The single fiber strength after the alkaline treatment is 3.6 to 4.2g and the elongation is 8 to 12%. The core part is not hollow and an excellent pilling resistance is exhibited. The fiber length of this fiber and the ratio of the core part to the sheath part are more preferably <=85mm and (core/sheath) =(4/1) to (1/4) respectively.