Chiang Mai Journal of Science

Cold pad-batch method is relatively more environment friendly due to high dye fixation and non requirement of thermal energy. The dyed fabric production rate is low due to requirement of at least twelve hours batching time for dye fixation. The proposed cold pad-batch method for dyeing cotton involves ultrasonic energy resulting into 1 h in batching time. The dyeing of cotton fabric was carried out with natural dye extraction from uncaria gambir bark by conventional and ultrasonic method. The study showed that the use of ultrasonic energy can be useful in the reduced batching time. In this case, the color strength (K/S) and dye fixation (F%) also enhances without any adverse effect on color fastness of the dyed fabric. The ultrasonic method gives nearly the same color fastness properties as the conventional method. Further improvement in color fastness was observed with additional mordanting.