METHOD FOR PRODUCING POLYESTER EXTRA FINE MULTI-FILAMENT YARN AND POLYESTER EXTRA FINE FALSE TWIST TEXTURED YARN, POLYESTER EXTRA FINE MULTI-FILAMENT YARN, AND POLYESTER EXTRA-FINE FALSE TWIST TEXTURED YARN

摘要

A polyester extra fine multi-filament yarn which has a single yarn fineness of 0.9 dtex or less, a total number of single yarns of 100 to 400 and a double refractive index of 0.03 to 0.06; and a method for producing the multi-filament yarn. A method for subjecting a polyester extra fine multi-filament yarn which has a single yarn fineness of 0.9 dtex or less, a total number of single yarns of 100 to 400 and a double refractive index of 0.03 to 0.06 to a stretch and false twist texturing; and a false twist textured yarn produced by the method.