Improvement Of Colour Uniformity During Dyeing Operation The Case Of Dress Gloving Leather

In leather industry, the tanner produces a production lot with large number of leather samples tornmatch a colour provided by a client. However, even when the leathers are dyed with the samerncolorants under well monitored conditions may show some colour non-uniformity. This is highlyrnchallenging today for leather manufacturers, especially glove producers to sort colour of leathersrnconsistently. The present study is focused on identifying the factors of colour variation duringrndyeing operation and reducing colour non-uniformity by managing the factors with welldesignedrndyeingrnrecipe.rnDyeing properties of the dyestuffs was investigated, by choosing two commercially available dyernstuffs. Factors of colour non-uniformity are identified by conducting dye trials on possible causesrnof colour non-uniformity with four different well-designed dyeing recipes. When concentrationrnof dyestuff, substance of skin or length of dyeing float are varied individually keeping othersrnfactors the same, a perceivable total colour difference (∆E*≥0.5) is observed. rnrnControlling and monitoring of colour non-uniformity is analyzed by conducting dye trials usingrnfour different well-designed dyeing recipes viz. reverse dyeing recipe, regular dyeing recipe, thernmultiple stage dyeing recipe and regular dyeing recipe with dye levelling agent. The total colourrndifference (∆E*) values obtained using multiple stage dyeing recipe was smallest as compared tornthe other three recipes by varying all possible factors of colour non-uniformity individually.rnFrom these observations, multiple stage dyeing recipe was the best alternative way to managerncolour non-uniformity.

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