Research on Plant Indigo Dyeing the Silk Fabrics

In this paper，dyeing process of plant indigo dye was studied, determining the optimum conditions of dyeing the silk with plant indigo. Based on the characteristics of ultrasonic, dyeing with the aid of ultrasonic was discussed. The results showed that higher K/S value can be achieved at lower temperatures so as to reduce the dyeing temperature, save energy and enhance the dye uptake.