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In this paper, compared with the traditional desizing process, the ultrasonic technology was applied to the pretreatment of PLA fabric combined with enzyme. The results showed that the fabric weight loss rate and the whiteness of the fabric increased 15% and 20% respectively after the ultrasonic treatment. Besides, the efficiency of the ultrasonic method also increased by 20% time saving.

In this paper, three disperse dyes were selected to study the kinetic dyeing model of PLA fabric. Based on the dyeing results and the SEM spectrum of PLA fabric before/after dyeing, the kinetic dyeing model was established. Besides, the half-dyeing time and the diffusion coefficient of the disperse dyeing process were also tested. These research results will be very helpful to the development of the application of PLA fabric and also set a theoretical base for the dyeing of such environmentally friendly fabric.