Evaluating the Performance of Alkali Reductive Stripping Process of Reactive Dyes

Evaluating the Performance of Alkali Reductive Stripping Process of Reactive Dyes

The aim of the paper was to investigate the dye stripping performance of cotton fabric dyed with 0.5%, 2.5% and 5% bihetero reactive dyes. Stripping was carried out in alkali reductive process varying concentration of stripping chemicals, stripping temperature and using leveling agent. In order to evaluate the performance of stripping processes, the stripping percentage, lightness value (L*) and average ΔE_CMC values of the stripped samples were calculated. With the increase of concentration of stripping chemicals and temperature, stripping percentages were improved. The L* values of stripped samples were found close enough to that of pretreated fabric to carry out re-dyeing. Leveling agent had good effect on the levelness of remaining shade depth in stripping operation.