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

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 degrees C). The heat-set of EDP and PES fabric were dyed separately and competitively at temperatures ranging from 100 to 130 degrees 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 degrees C for PES and 140 degrees 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 degrees 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 degrees C, respectively.