Study on Determination of Color Depth in Dependence on Concentration for Reactive Dyed Knitted Cotton Materials and Analysis Their K/S, Wash and Rubbing Fastness

Abstract

In this study dyeing is done for 100% cotton knitted cotton fabric with reactive dye at various shade percentage. Used shade percentages are 2%, 3%, 5%,6%,7%. The method of dyeing is Exhaust dyeing for 100% cotton knitted fabrics. The main focus of this study is to determine the saturation level of reactive dyes for dyeing cotton materials. Scouring and bleaching is done in a single bath at 98°C and dyeing is done at 60°C. After the dyeing process, we measured the K/S value by using spectrophotometer for determination of the color strength for 2%, 3%, 5%, 6% & 7%. We have got almost similar K/S value for 6% & 7% shade. Also find out the fastness properties like color fastness to washing and color fastness to rubbing for 2%, 3%, 5%, 6% & 7% shades of the reactive dye from this experiment. The rating of the color fastness to washing is same for 2%, 3%, 5%, 6% shade. But in 7% shade, it is found that rating of the color fastness to washing is better if we compare with 2%, 3%, 5% & 6%. In addition, the rating of the color fastness to rubbing for 5%, 6% & 7% is very low and higher rating for 2%, 3%. So from this study, we can say that with the increasing shade % rating of the wash fastness is high and rubbing fastness rating become low.