Process Flow Chart of Super White Wash

Super White Wash 

BATCHING
↓
LOADING
↓
DESIZING (IF NECESSARY)
↓
FIRST/ WHITE WASH
↓
REFINING WASH
↓
NEUTRALIZATION
↓
BRIHTENING TREATMENT
↓
FINISHING/SOFTENING
↓
DRYING

Working procedure of super whitewashing process: Super white washing is a washing process that is carried out mainly for increasing the whiteness effects of white fabric. Super white wash is done especially on the garments made from cotton grey fabric. The garments after washing look extremely white. In this washing, the mainly used chemical is an optical brightening or whitening agent.

Super whitewashing process for 100 kg garments–

 1. De-sizing: 

• Batch size: 100 kg cotton grey fabrics.
• Water and Liquor –  L:R: 1:8
• Machine running
• Temperature up to 90°C
• Add detergent – 2%
• Cold caustic soda – 8%
• Add Soda ash – 5%
• Hydrogen per oxide – 12%
• Stabilizer – 5%
• Time: 70 minutes
• Drop the liquor

2. Bleaching:

•   Add detergent – 1%
•  Add Caustic soda – 3- 4%
•  Hydrogen per oxide – 6-8%
•  Stabilizer – 2%
•  Time: 45 – 60 minutes
•  Temperature: 90°C

3. Hot Wash:

• Temperature: 50°C-80°C
• Time: 5-10 minutes
•  Drop the liquor

4. Neutralization:

• Add Acetic acid – 1%
• Time: 5 – 10 minutes
• Cold wash

5. Brightening:

• Add optical brightener agent – 0.5 – 0.6%
• Time: 5-10 minutes

6. Softening/ finishing:

• Add softener – 0.5 – 1%
• Time: 5 – 10 minutes

7. Hydro extraction:

Extracted extra water (up to 70%) from the garments.

8. Drying:

• Load 60kg garments to gas dryer
• Machine running
• Temperature: 75°C-85°C
• Time: 40 minutes in a hot dryer
• After than run 10 minutes in a cold dryer.

9. Delivery:

After a final inspection of the quality control department garments are ready for delivery.

Author of this Article:
Noor Ahmed Raaz
 B.Sc. in Apparel Manufacturing 
 Asst. Merchandiser at A.M.C.S Textile Ltd 
 Email: raju.uttara72@yahoo.com