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Denim garment was treated with cellulase enzyme by varying the process parameters, namely concentration of enzyme, washing temperature and time to develop novel design and fashion. The effect of process parameters on the physical and mechanical properties of cotton denim garment was investigated and denim fabric properties like tensile strength, elongation at break, weight loss, stiffness, water absorption, shrinkage, color fading and morphological values by SEM were discussed. To obtain the desired fashion effect in terms of color fading, comfort ability in terms of reducing the stiffness of denim and high wear performance in terms of longevity/minimum tensile strength losses of denim, indigo dyed denim garment (trousers, 100% cotton with twill weave 3/1 construction) had been chosen and processed with the enzyme concentration of 0.5% to 3.5%, treatment temperature from 40°C to 70°C and treatment time from 20 min to 60 min. The process parameters were optimized and the optimized washing condition for the best value is 2% enzyme concentration at 55°C for 40 min.

Chemical washing of fresh-assembled denim garment is a fundamental finishing process in textile and readymade garment industries and has the largest effect on the physico-mechanical properties on finished denim garment. In this study, modification of denim trousers by washing using pumice stone mixed with bleaching powder was investigated. The fresh-assembled denim trousers, twill 3/1 weave and composition 100% cotton, have been processed by stone-bleach treatment using parameters namely concentration of bleaching powder (5.0 to 15.0 g/L) (owl) with 30% pumice stone (owg) at washing temperature 40 o C and at pH 10.5 for treatment time 20 min in the fiber to liquor ratio of 1:10 in an industrial sample washing machine. In order to evaluate the influence of these washing parameters on the properties of denim trouser like tensile strength, fabric weight, color change, stiffness and water absorption, has been determined. Fabric surface was also examined by scanning electron microscope (SEM) and fluorescence microscope (FM). It can be concluded that the washing parameters had influenced on the physico-mechanical properties of finished denim garment. Especially stone-bleach treatment helped to get the specific color fading effect and softness of denim garment, which gave a new-look appearance and good wear performance to the fabric distinctly. The results indicate that for producing durable and sustainable denim garment the optimized washing condition for the best value is 10.0 g/L bleaching powder mixed with 30% pumice stone in the stone-bleach treatment.

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