| 摘要 |
PROBLEM TO BE SOLVED: To obtain a combined filament yarn different in shrinkage of yarn capable of providing a fabric excellent in hygroscopic property and light resistance and having swelling feeling by constituting the yarn of specific polyester-based conjugated yarns, etc., and weaving or knitting the yarns and subjecting the resultant fabric to weight- reducing treatment by alkali. SOLUTION: This polyester-based combined filament yarn different in shrinkage is composed of plural yarns in which single yarn constituting one or more yarns has hygroscopic property. The combined filament yarn has a three layer structure composed of a core layer comprising a thermoplastic resin 3 such as a polyalkylene terephthalate containing 10-50wt.% polyalkylene glycol having 2,000 to 20,000 average molecular weight, a sheath layer comprising an readily alkali-soluble resin 1, and an intermediate layer comprising a polyester resin 2 which is more slightly soluble in alkali than the sheath layer and arranged in the intermediate between the core layer and the sheath layer and satisfies the formula SA<=50 and the formula SA-SB>=5 [SA is boiling water shrinkage factor (%) of the highest shrinkage yarn in combined filament yarn and SB is boiling water shrinkage factor (%) of the lowest yarn in combined filament yarn]. |
