Now You Know Performance Analysis of Denim Garments by Bleach Wash (Part-6)

Performance Analysis of Denim Garments by Bleach Wash (Part-6)

Authors: Md. Anwarul Haque¹
Ariful Hassan²
Shantonu Paul Shuvra
Md. ShagorHossain
Textile Engineering College, Begumgonj, Noakhali.
Email: haquebd2014@gmail.com¹ , arifulhassan034@gmail.com²

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EXPERIMENTAL

Washing of the denim
Washing of the denim cause it to fade which result its unique look. There are at least three fundamental reason that indigo dyed denim washes down to produce lighter and more attractive shades during washing.

The outer more heavy dyed yarn surface loses dyed through abrasion by stones, enzymes and chemical effect.

Denim washing

Indigo dye has intrinsic chemical instability to strong oxidizing agent such as chlorine bleach.

Some of the un-dyed fiber in the interior of the yarn migrates to the yarn surface diluting the color of the yarn.

There are two process involved in denim washing:

DRY PROCESS
WET PROCESS

DRY PROCESS
It is called Dry Process because all the processes which are listed below is done in dry condition, in the other says we don’t use any chemical including water in this process.

Following process are carried out in DRY process. Which are listed below:
1. Brushing
2. Hand whisker
3. Grinding

Hand Grinding
Wheel Grinding

4. Tagging
5. Clipping

WET PROCESS
It is called wet process because in this way we use certain chemicals to obtain a desired result.

Following process are carried out in wet process. Which are listed below:

De-sizing
Bleaching
Neutralization
Softening
Hydro-extractor
Drying

Working Place

HAMS Washing and Dyeing
Bangladesh University Of Textile
Textile Engineering College, Noakhali

Raw Materials used for bleaching
The raw materials for making household bleach are chlorine, caustic soda, and water. The chlorine and caustic soda are produced by putting direct current electricity through a sodium chloride salt solution in a process called electrolysis. Sodium chloride, common table salt, comes from either mines or underground wells. The salt is dissolved in hot water to form a salt solution, which is then treated for impurities before it is reacted in the electrolytic cell.

Machine names which are used in washing plant