Patent ID: 6723265
Filing Date: 2004-04-20
Classification: D01D,D01F,D02G

Abstract:
A method for producing polyester-based combined filament yarn characterized as adding a polymer different from a base polymer comprising a polyester component in an amount within the range of 0.3 to 5.0% by weight based on the base polymer to the base polymer, melt-extruding the resulting composition from the same pack, cooling the extruded filament groups comprising polyester multi-filaments once to the glass transition temperature or below, then dividing the filament group into two groups, subjecting one of the filament groups in an opened state to non-contact heat treatment at an atmospheric temperature of 120Â° C. or above, keeping the other filament group in a state without being subjected to the heat treatment, subsequently simultaneously taking off the respective filament groups at a speed of 2500 m/min or above, doubling and mixing the filaments,wherein the spinneret hole diameter of the filament group without being subjected to the heat treatment is 1.5 times or above the spinneret hole diameter of the filament group in the opened state subjected to the heat treatment.