Enzyme washing of indigo and sulphur dyed denim

A K Patra,Neeraj Bala,Amit Madhu

doi:10.1186/s40691-017-0126-9

Abstract

A wide ranging finish effects have been given to denim fabrics in industrial scale to make it more fashionable and functional. Among the numerous wet and dry treatments given, worn out looks of various kinds have received the maximum attention. In this context, herein, two denim fabrics, one dyed with vat indigo and the other with sulphur black were enzyme washed. The enzymes used were acid cellulase and neutral cellulase and the treatments were done at varying concentrations, time and mechanical agitation. The trials so taken were based on design of experiments, and the effect was analysed in terms of decrease in colour depth and weight loss. Back staining of fabric during the wash was also checked and acid enzyme despite higher colour removal, caused significant staining in sulphur dyed quality. Attempt was made to contain this back staining by suitable treatment. The application conditions of cellulases on the denim qualities were also optimized for fading effect.

Highlights

Denim as a fabric, has received the widest acceptance among all textile products
L was studied on the K/S value of dark blue indigo and sulphur black dyed denim fabric using Box-Behnken design
The fading effect achieved was shown by the change in colour strength while the removal of surface fibres was clear from the loss in weight of the denim qualities

Summary

Introduction

Denim as a fabric, has received the widest acceptance among all textile products It has had an incredible influence on consumers both socially and culturally (Paul 2015). This twill cotton fabric usually has warp threads indigo dyed while weft remains plain white. The pumice stone, scraps off the dye particles from the yarn surface in the denim fabric. Due to the ring dyeing of denim fabric and heavy abrasion during stone washing process, the faded effect is achieved. The enzymes used are cellulase enzymes, acting on the cellulose part, mainly on the surface of the fabric.

Methods

Results

Conclusion