One-Bath Process of Enzymatic Pretreatment and Trichromatic Reactive Dyeing of Viscose Fabric

The viability of reactive dyeing in the same bath without draining the liquor after enzymatic bio-treatment has been investigated. The comparative impact of applying the one-bath bio-treatment and dyeing method using two sets of commercially available polyfunctional and bifunctional trichromatic reactive dyes has been studied and the findings are compared with the two-bath conventional process. Three dyeing recipes in Maroon, Olive and Brown colour combinations of dyed fabrics are evaluated with respect to the colour strength, colourimetric data and fastness properties. The produced one-bath bio-treated and dyed samples show fairly high colour strength and satisfactory colour difference values as compared to the conventional method. The polyfunctional trichromatic reactive dye class is found more sensitive to the type of pretreatment and dyeing method used, imparting slightly higher colour difference values as compared to those of the bi-functional reactive dye class. The design and application of the one-bath Bio-method could provide a significant approach for demanding viscose fabric pretreatment and trichromatic reactive dyeing at reduced time, water and energy parameters.