Study of Physical Changes in Denim Fabric After Enyme & Bleach Washing Processes

Abstract

Raw denim fabric obtained after finishing is mostly impossible to wear before wash because of the rigidity and stiffness of finished denim. Finished denim is also very dull looking before wash. So, it is usually a must for denim to go through different washing processes not only for changing the physical property but also for the change of aesthetic property of denim. This project is done for comparing the physical properties like EPI, PPI, weight and shrinkage% of denim fabric with different constructions after Enzyme and Bleach wash. This is a survey-based project as no experiment is done to complete this project. Different washing processes like Enzyme, Bleach, Stone washes were observed and the visual change is seen. The information about the change in physical properties like EPI, PPI, weight & shrinkage% were collected from the Details Sheet provided by the QC section of Shasha Denims Ltd. After compiling and comparing all the necessary data, it is seen that the increase in EPI averaging at 21.36% is more drastic than the change in PPI averaging at 3.15% after both Enzyme and Bleach wash. These two washes have similar impact on EPI, PPI, weight and shrinkage after wash. Among the three shrinkage types, width shrinkage averaging at 15.76% is the most extreme compared to length and skew shrinkage averaging at 2.66% and 0.86% respectively after Enzyme and Bleach washes. This extreme width shrinkage is also the reason behind the drastic increase of EPI after both Enzyme and Bleach Wash.