LOW-TEMPERATURE ULTRASONIC DYEING OF SILK

Silk was dyed with cationic, acid and metal-complex dyes at low temper atures in the presence of ultrasonic energy for relatively short durat ions. The results in terms of dye uptake were compared with those obta ined by conventional processes run at higher temperatures and for long er dyeing times. It was found that the ultrasonic energy helps in obta ining good fast dyeings, simultaneously conserving energy and reducing the time required for the dyeing process. In some cases the dye uptak e was even higher than that obtained by the conventional dyeing proced ures.