Analyzing the dyeing behaviour of easy dyeable and regular polyester by the influence of different heat-setting temperature

Abstract

The heat-setting effects of easy-dyeable polyester (EDP) have been investigated by comparing it with regular polyester fabric (PES). Using XRD analysis, the crystallinity and amorphousness of the easy-dyeable polyester and regular polyester fabric were assessed after 45 s during heat-setting of EDP and PES at nominal temperatures (120, 140, 160, 180, and 200 °C). The heat-set of EDP and PES fabric were dyed separately and competitively at temperatures ranging from 100 to 130 °C using S-type (C.I. Disperse Red 167) and E-type (C.I. Disperse Red 60) dyes. The color strength (fk ) and dye uptake were found to be lower at the heat-setting temperatures of 180 °C for PES and 140 °C for EDP. To ascertain the impact of varying heat-setting temperatures on PES and EDP-dyed fabric, the dimensional stability and GSM were assessed. When the heat set temperature was raised from 140 °C, the EDP fabric showed greater dimensional stability. On the other hand, the dimensional stability of untreated PES fabric (−4.2% lengthwise) and GSM (111 g/m2) gradually stabilized when the heat-setting temperature increased. However, the color fastness rating has improved after applying the heat-setting process for PES and EDP at 180o C and 140 °C, respectively.