| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for the process-stable low-cost production of a combined polyester filament yarn with shrinkage difference capable of providing a cloth having excellent color development, softness and bulkiness. SOLUTION: Provided is a method for producing a spun combined filament yarn by extruding two or more yarns having elongation difference from the same spinneret 1 and winding the yarns, wherein the combined filament yarn is a combined polyester filament yarn with shrinkage difference, the high-elongation yarn has a sheath-core structure containing a polyester in the sheath part and a polystyrene in the core part, the low-elongation yarn is composed of a single polyester yarn, and the filament yarn satisfies the following conditions 1 and 2: (1) the melt mass flow rate MFR of the polystyrene is 3.5-10.0 g/10 min; and (2) the Cps/MFR ratio is 2.0-3.5 wherein Cps (wt.%) is the compounded amount of polystyrene in the high-elongation yarn and MFR (g/10 min) is the melt mass flow rate. COPYRIGHT: (C)2009,JPO&INPIT
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