Process Flow Chart of Scouring and Bleaching

The following flowchart will be applicable for knit dyeing and especially for jet dyeing machines. Process Flow Chart of Scouring and Bleaching is as follows:

Process Flow Chart of Scouring and Bleaching

Process Flow Chart of Scouring and Bleaching:

Machine filling with water

Chemical Dozing at 50 ºC

Run time 10 min.

H2O2 Dozing

Heating at 60 0C

NaOH dozing

Heating at 110 ºC

Run time 20 min.

Cooling at 95 ºC

Rinse at 80 ºC

H2O2 – Killer Dozing

Run time 10 min

Run time 10min.

Cooling for 55 ºC

Acid wash 3 min → Drain


Scouring is the process of removing the impurities such as oil, fat, wax dust, and dirt from the textile material to make it hydrophilic. Bleaching is the chemical treatment for the removal of natural coloring matter from the fabric. The source of natural color is organic compounds with conjugated double bonds, by doing chemical bleaching the discoloration takes place by breaking chromophore. The material appears whiter after the bleaching.

Scouring is the process by which all-natural and adventitious impurities are removed to produce hydrophilic and clean textile material. It is one of the important processes of wet processing. It is done also for increasing absorbency of textile material.

Scouring objectives:

The principal aim of scouring is to remove textile material impurities. Some other objectives are;
  1. In order to make the material extremely hydrophilic.
  2. To considerably absorb textile products without suffering chemical or physical harm.
  3. A neat material is generated by adding alkaline.
  4. For cotton removal of non-cellulosic material.
  5. In order to make the textile material prepared for subsequent bleaching.


Bleaching is a chemical treatment employed for the removal of natural coloring matter from the substrate. The main purpose of bleaching is to ensure a pure and permanent basic white color fabric.

Objects Of Bleaching

There are many objects as follows –

  1. To remove the natural color.
  2. To-make the fabric permanent white and bright.
  3. Increase the absorbency power of the cloth.
  4. Increase dye affinity.
  5. Ensure level dyeing property.
  6. Make the fabric suitable for the next subsequent process.
Author of this Article:
Rana Sohel 
Executive Engineer 
Sunman Textile Mills Ltd. Chittagong 
Cell: +8801912-420118 
Email: [email protected]

Sharing is caring!

Leave a Comment