Acid Wash:
During Acid wash, pumic
stones are used. By the action of pumic stones, irregular fading affect is
developed on the heavy garments like denims, thick canvas/twill, and sweater.
The pumic stones act a brushing action on the garment fabric surface. The area
where more brushing action takes place there more dicolour or fadding affect is
developed and the area where less brushing action takes place less brushing
action and takes place less fadding affect will be developed. The multi-layer
fabric areas like –collar, calf, pocket, placket, side seam etc area will be
brushed more than the single layer areas. As a result irregular fadding affect
will be developed on the garments fabric surface. Thus in this way fading
affect may be developed on the garment by acid wash technique.
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.
Acid Wash Process:
A processor Acid wash of 60 kg batch of Denim Trouser as mentioned below:-
First Step: Pretreatment/Desizing.
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.
Acid Wash Process:
A processor Acid wash of 60 kg batch of Denim Trouser as mentioned below:-
First Step: Pretreatment/Desizing.
- Add water @ L : R = 1 : 10 .............. 600 litres.
- Start Machine.
- Add desizing agent @ 1 gm/litre .................600
Gms.
- Add detergent @ 1 gm/litre ........................ 600
Gms.
- Temperature............................. 60°c.
- Time........................... 20 mts.
- Drop the liquor.
- Rinse one for 3 minutes (cold).
Second Step:Hot wash
- Add water @ L: R = 1: 10.............. 600 litres.
- Temperature............................. 60°c.
- Time........................... 5 mts.
- Drop the liquor.
- Here hot wash is used to remove the adhering materials
from the garment surface.
- Unload the garments from the washing m/c in the
trolley.
- Load the pre treated garments in the dryer m/c.
- Dry the garment completely & unload the garments.
- The pumic stones used for acid wash need to pre-treat
in the following chemical solution:
- Water ..................... 100 L
- Potassium per manganate.............. 1000 Gms.
- Phosphoric Acid............................... 250 Gms.
- Stire the solution in a stainless steel tub with dry
pumic stone.
- Soak the stones with the chemical solution ......... 10
–15 minutes.
- The stones will pick up the solution. Then the soaked
stones are dried in the open air for.............. 2 to 3 hrs.
- Then pre-treated garment 30 –40 kg per batch load in
the dry washing machine.
- Load the per-treated stones (about 50 kg) in washing
machine.
- Start machine running for each batch
........................ 7 to 10 mts.
- Stop machine running.
- Unload the treated garment separately. Pumic stones
with P.P. solution hit on garment surface as a result fadding will be
developed.
- Then load the stones treated garment in another washing
machine.
Third Step:Wash for
Cleaning
- Batch wt................................ 70 kg.
- Add water @ L: R = 1: 8.............. 560 litres.
- Add detergent @ 1 gm/litre .............560 Gms.
- Temperature............................. 40°c -50°c.
- Time ..................................10 mts.
- Drop the liquor.
- Here detergent is used to remove the breaking stone
dust and chemicals from the garment surface.
Fourth
Step:Whitening/Neutralization
- Add water @ L: R = 1: 8.............. 560 litres.
- Machine running.
- Add Metabisulphite @ 5 gm/litre..... 2800 Gms.
- Cold temperature.
- Time 5 mts.
- Drop the liquor.
Fifth Step: Soft Wash
- Add water @ L: R = 1: 7.............. 490 litres.
- Machine running.
- Add Acetic acid @ 0.6 gm/litre .....................
294 Gms.
- Add Softner @ 1 gm/litre ........................ 490
Gms.
- 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 delivery.
Precaution:
- Maintain the stock solution properly constant when
comes socking the stone.
- No water licks age in to the machine when treated pumic
stone & garments in to the machine.
- Not excess load the garments in the Acid wash
processing.
- Add some new stone after finishing on batch to maintain
the volume for 2nd batch. It is a mater of experience.
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