How to impart better wash and rub fastness properties to reactive dyed goods?
A. In reactive dyeing at fixation stage, when alkali is used, it acts as catalyst for formation of covalent between dye and fibre reactive sites. At the same time during alkaline conditions hydrolyzed dyes are formed, which acts as direct dye. This hydrolyzed dye results in poor wash and rub fastness property. To overcome this problem better washing-off action is needed, such that all hydrolyzed dye gets removed. Few reactive dyes results in bleeding during home laundering. To overcome this problem dye-fixing action need to be carried out. Brief information about textile processes: Sizing During sizing, chemicals are applied to the yam before the production of a woven fabric. Substances such as starch, polyvinyl alcohol (PVA), polyvinyl acetate, carboxymethyl cellulose (CMC) and gums enhance the tensile strength of the warp yarn so it can withstand the mechanical forces during weaving. The commonly used sizing materials for cotton are starch, polyvinyl alcohol (PVA), and carboxymethyl
