PREPARATION OF POLYESTER COMBINED FILAMENTARY YARN OF DIFFERENT DENIERS

摘要

PURPOSE:To obtain the titled combined filamentary yarns having different shrinkage in boiling water between yarn groups and a good feeling at a low cost, by spinning a polyester through plural spinning hole groups at varied outputs of an extruded polyester per hole under specific conditions to give a maximal fineness per filament at a specific ratio to the minimal value, and drawing the resultant filamentary yarns. CONSTITUTION:In preparing combined polyester filamentary yarns having different finenesses per filament, the polyester is melt extruded through plural spinning holes at varied outputs of the extruded polyester per hole to give a fineness per filament after the taking off of the filamentary yarn groups of the maximal fineness per filament of 1.2-9 times that of the minimal fineness per filament after the taking off of the yarn groups having the minimal fineness, taken off at a speed of 2,500-5,000m/min and, without taking up, drawn at a draw ratio =1.05 to afford the aimed combined filamentary yarns having a shrinkage in boiling water (BWS) of the yarn groups having the maximal fineness 5% or more larger than that of the yarn groups having the minimal fineness.