Cashmere skein dyeing with reactive dyes

There exist some problems during cashmere skein dyeing,such as considerable damage of yarn,significant strength loss,low dye uptake and dull luster.Thus,this study used reactive dyes to dye the cashmere skein instead of mordant dyes while taking into consideration the actual cashmere production of Erdos Group.The dyeing process conditions of liquor ratio,pH value,temperature and time were studied and the optimum process was determined.The results indicated that Lanasol CE dyes and clausol dyes can be used to replace mordant dyes to perform deep-dyeing of cashmere skein.Strict control of the process parameters was critical to improve the quality of dyed product.The reasonable process parameters were as follows: pH = 4.5,liquor ratio 1∶30,dyeing rate 1.5 ℃/ min,dyeing temperature 90 ℃,and holding time 90 min.