In case of bleach wash, garments are normally dyed with
direct or reactive dyes.
Flowchart of bleach wash is as follows:
Bleach Treatment
↓
Hot Wash
↓
Neutralization
↓
Softening Treatment
(Optional).
Sample recipe for bleach wash: If lot size is 100kg and
Material Liquor Ratio is 1:5.
1. For bleaching treatment,
Water =
500liter.
Caustic
Soda (NaOH) = 2% OWF.
Soda Ash =
2% OWF.
H2O2
= 5ml/liter.
Stabilizer
= 2.5m/liter.
Temp =
80ºC.
Time =
60-70minute.
pH = 10-11.
2. For hot wash,
Temp= 60ºC.
Time = 5minute.
Drop.
3. For neutralization,
Acetic acid
= 2ml/liter.
Temp = Room
temperature.
Time =
5minute.
4. For softening,
Softener =
0.1 to 0.5% OWG.
Time =
5-10minute.
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