ACID WASH

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 Objects of Acid Wash:
1. To produce irregular fading effects or old looking effect.
2. For soft feeling to wear the garments i.e. to improve softness.
3. To achieve the buyer washing standard.
4. To increase rubbing fastness. more pronounce than stone wash. Acid wash is a very dirty process due to widely use of pumice stone.   Acid Wash Process:
A processor Acid wash of 60 kg batch of Denim Trouser as mentioned below:-

First Step: Pretreatment/Desizing.

1. Add water @ L : R = 1 : 10 .............. 600 litres.
2. Start Machine.
3. Add desizing agent @ 1 gm/litre .................600 Gms.
4. Add detergent @ 1 gm/litre ........................ 600 Gms.
5. Temperature............................. 60°c.
6. Time........................... 20 mts.
7. Drop the liquor.
8. Rinse one for 3 minutes (cold).

Second Step:Hot wash

1. Add water @ L: R = 1: 10.............. 600 litres.
2. Temperature............................. 60°c.
3. Time........................... 5 mts.
4. Drop the liquor.
5. Here hot wash is used to remove the adhering materials from the garment surface.
6. Unload the garments from the washing m/c in the trolley.
7. Load the pre treated garments in the dryer m/c.
8. Dry the garment completely & unload the garments.
9. The pumic stones used for acid wash need to pre-treat in the following chemical solution:
   
10. Water ..................... 100 L
11. Potassium per manganate.............. 1000 Gms.
12. Phosphoric Acid............................... 250 Gms.
    
13. Stire the solution in a stainless steel tub with dry pumic stone.
14. Soak the stones with the chemical solution ......... 10 –15 minutes.
15. The stones will pick up the solution. Then the soaked stones are dried in the open air for.............. 2 to 3 hrs.
16. Then pre-treated garment 30 –40 kg per batch load in the dry washing machine.
17. Load the per-treated stones (about 50 kg) in washing machine.
18. Start machine running for each batch ........................ 7 to 10 mts.
19. Stop machine running.
20. Unload the treated garment separately. Pumic stones with P.P. solution hit on garment surface as a result fadding will be developed.
21. Then load the stones treated garment in another washing machine.

Third Step:Wash for Cleaning

1. Batch wt................................ 70 kg.
2. Add water @ L: R = 1: 8.............. 560 litres.
3. Add detergent @ 1 gm/litre .............560 Gms.
4. Temperature............................. 40°c -50°c.
5. Time ..................................10 mts.
6. Drop the liquor.
7. Here detergent is used to remove the breaking stone dust and chemicals from the garment surface.

Fourth Step:Whitening/Neutralization

1. Add water @ L: R = 1: 8.............. 560 litres.
2. Machine running.
3. Add Metabisulphite @ 5 gm/litre..... 2800 Gms.
4. Cold temperature.
5. Time 5 mts.
6. Drop the liquor.

Fifth Step: Soft Wash

1. Add water @ L: R = 1: 7.............. 490 litres.
2. Machine running.
3. Add Acetic acid @ 0.6 gm/litre ..................... 294 Gms.
4. Add Softner @ 1 gm/litre ........................ 490 Gms.
5. Then unload the garments.

Sixth Step:Hydro Extractor Machine

• Hydro extractor machine to remove excess water from the garments.

Seventh Step:Dryer Machine.

• After hydro extraction the garments are sent to drying m/c for complete drying.

Eighth Step:Quality & Delivery.

• After drying the garments go to quality checking & rectify washing fault and then good one deliver.