Effect of ultrasonic on desizing and bleaching of cotton
The ultrasonic was used to pre-treat cotton fabrics. An L9(33) orthogonal experiment was designed after a single factor experimental analysis on factors affecting cotton fabric weight loss rate. The optimal technological conditions were determined based on the impacts of ultrasonic treatment on the properties of cotton fabrics. Under the optimal process, factors affecting bleaching were analyzed to select the best bleaching process. The results were as follows. The optimum process of the ultrasonic desizing: temperature 50℃, 30 min, frequency 50 k Hz; the optimum process of cotton fabric bleaching with H2O2: H2O2 concentration of 20 g·L-1, 30 min, 60℃. Under the optimum process, the weightlessness rate, whiteness, wicking height, breaking strength, and elongation rate of cotton fabric was 14.28%, 76.5, 7.4 cm, 305 N, and 42.8%, respectively. The data suggested that ultrasonic pretreatment can reduce the amount of pretreated reagent, shorten the time and decrease production costs.