Production manner of suppressed minute reduction revelation Characteristic polyester multi filament yarn provision and production manner null of its interweave

摘要

PROBLEM TO BE SOLVED: To obtain the subject yarn imparted with self-elongation ability, capable of developing fine crimps by heat treatment in its dyeing, and processable into knitted fabrics with new touch feeling free from slimy feeling, by making a polyester having specific recurring unit and intrinsic viscosity into fibers. ;SOLUTION: A polyester containing at least 85mol% of ethylene terephthalate unit and having an intrinsic viscosity of 0.45-0.70g/cc is subjected to melt spinning at a spinning take up speed of 2000-4000m/min and imparted with self- elongation ability by e.g. dry heat relaxed treatment at a relaxation rate of 10-100%, thus obtaining the objective polyester multifilament yarn negative in dry heat shrinkage SHD at 160°C. When this yarn is dyed, fine crimps satisfying the following relationship are developed: (1) 20≤CN≤90; (2) 20≤BD≤120; (3) -10≤SHD≤0; and (4) -2≤SHW≤3 (CN is the number of crimps per inch; BD is degree of bulkiness; SHD(%) is dry heat shrinkage at 160°C; SHW(%) is boiling water shrinkage).;COPYRIGHT: (C)1997,JPO