Process Flow Chart of Acid Wash

By | August 22, 2015

Process Flow Chart of Acid Wash

Mayedul Islam
Merchandiser at Fashion Xpress Buying House.
Badda, Dhaka, Bangladesh.
Email: [email protected]


Acid Wash:

Acid washing process was created in Italy and patented in 1986. Garments made from heavy jeans and denim fabrics, course canvas, sweater and thick twill etc. are washed by applying acid wash technique. By applying acid wash technique, irregular pattern fading effect is produced in the garments, where the effects more pronounce than stone wash. Acid wash is a very dirty process due to widely use of pumice stone.

You may follow Technical Audit Checklist in Textile and Apparel Industry

Acid washed jeans

Acid washed jeans

Process Flow Chart of Acid Wash:

Garments loading in machine


Extracting the garments


Soaking of pumice stone

Damp pumice stone

Neutralization the garments


Extracting the garments


All the above processes are discussed in the following:

1. Garments loading in machine:
It is the first process of acid wash. Required amount of garments are loaded in the machine here for de-sizing the garments.

2. De-size:
The garments are de-sized here by using detergent and de-sizing agent. Required amount of de-sizing agent should be applied here by following M: L ratio. Here, sometimes needed 50-60° C temperature depends on the shade. De-size should be done at least 15-20minutes.

3. Extracting the garments:
After completing de-sizing process, the garments are squeezed here by using hydro-extractor machine and send to the drying section.

4. Drying:
Here the extracted garments are dried by using gas dryer or steam dryer depending on the sahde. It should be noted here that, gas dryer is used for reddish shade and steam dryer is used for bluish shade.

5. Soaking of pumice stone:
The fresh pumice stones are soaked here at room temperature for 10minutes by shuffling using Potassium permanganate (KMnO4) and Phosphoric acid (H3PO4) containing the liquor ratio 1:2. Pumice stones are naturally perforated and should pick up the solution very quickly.

6. Damp pumice stone:
After the required soaking of pumice stone, the completely dried de-sized garments are treated in the machine with damp pumice stones at room temperature for 15 minutes (depending on the shade). After completing this process, garments are unloaded from the machine and loaded in another washing machine for neutralized the garments.

7. Neutralization the garments:
After completing damp pumice stone process, the garments must be neutralized here by using Sodium meta-bisulphite (Na2S2O3) containing the liquor ratio (M: L) for 5minutes (depending on the shade).

8. Softening:
Here the garments are producing too soft effect by using softening chemical containing liquor ratio (M: L). After completing this process, garments are unloaded from the machine.

9. Extracting the garments:
Here the acid washed garments are extracted and send to the drying section.

10. Drying:
Finally the garments are drying here by using gas dryer or steam dryer depending on the shade.

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