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Modelling of Colour Yield for Selected Reactive Dyes in Dyeing Cotton Cloth by Two Phase Pad-steam Method

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Mathematical Modelling can lead to a better understanding of the role of variables in real dyeing process. The aim of this study was to model colour yield in dyeing cotton cloth with selected reactive dyes via two phase pad-steam fixation method, as a function of steam temperature, steaming time and alkali concentration. Factorial design was employed and at first. polynomial regression models were produced for the selected monochlorotriazine, dichlorotriazine, trichloropyrimidine and vinylsulphone reactive dyes. As these models did not meet the necessary requirements, orthogonal polynomial regression was employed. This led to the acceptable models except in one case. The models for the selected dyes in each group of monochlorotriazine, dichlorotriazine, trichloropyrimidine showed similarity but not for vinylsulphone dyes. Response surfaces of the models can be used to find the optimum conditions that maximize the colour yield of each dye.

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