Simultaneous Dyeing and Texturing of Polyester/Viscose Blended Yarn

Abstract

A unique system for simultaneously dyeing and texturing polyester/viscose blended yarn is reported. Dyeing and texturing were accomplished by pad-thermosol and alkali shock treatment. A single bath was used, containing a mixture of disperse and reactive dye, along with dimethyloldihydroxyethyleneurea and an acid catalyst. Dye fixation and texturing were achieved by baking the treated yarn on a Scragg Mini bulk machine using a heater temperature of 210°C for 2.5-5 seconds; however, higher color yields and wash fastness were obtained by post-alkali shock treatment. The results of continuous dyeing and texturing also show a very uniform coloring and high color yield as compared to that obtained by the cross-dyeing involving high temperature dyeing followed by pad-alkali shock treatment of textured yarns. The crimp rigidity and the tensile properties of simultaneously dyed and textured yarns were also not affected in any way, because the dyeing step was incorporated with texturing.