METHOD FOR PRODUCING POLYESTER COMBINED FILAMENT YARN WITH DIFFERENT SHRINKAGE

摘要

PROBLEM TO BE SOLVED: To provide a method for easily producing in high productivity the subject combined filament yarn intended for giving fabrics of excellent touch without the need of using any self-elongative filament yarn. ;SOLUTION: The subject combined filament yarn comprises high-elongation yarn and low-elongation yarn; wherein the high-elongation yarn consists of a sheath/core conjugate yarn composed of a polyester as the sheath and, as the core, a polymer higher in the temperature dependency of tensile viscosity than the above polyester, while the low-elongation yarn consists singly of a polyester yarn. This method for producing the above combined filament yarn comprises the following process: at least two kinds of polymers corresponding to the high-elongation yarn and the low-elongation yarn are issued (melt-spun) from an identical spinneret into an indrawn heteroelongative combined filament yarn finished with ≥0.1 wt.% of a non-polyether-based lubricant, which is subsequently drawn at a draw ratio 0.40-0.50 time the breaking draw ratio of the filament yarn with the highest elongation at 90-110°C followed by heat-setting the thus drawn filament yarn at 110-130°C.;COPYRIGHT: (C)2001,JPO