The Effects of Heat-Setting on the Properties of Polyester/Viscose Blended Yarns

Abstract

tex and 20 tex yarn bobbins consisting of 67% PES - 33% viscose were subjected to heat- setting at 90 °C & 110 °C, and under a pressure of 630 mmHg in order to investigate the effects of heat-setting conditions on the properties of twisted yarns. Both heat-set and unset yarns were dyed. The tensile strength properties (tenacity and elongation at break) of each yarns were measured before heat-setting, after heat-setting and after dyeing. The inner, middle and outer sections of the yarn bobbins were measured with a spectrophotometer to find differences in color. As a result, heat-setting and dyeing processes were found to be effective in the tenacity and elasticity of yarns.