What is Whitening Treatment? | Factors Influencing Whitening Process | Whitening Process for 100% Cotton | Whitening Process for Polyester-Cotton Blended Fabric

Whitening :
Whitening is a chemical treatment, which is applied on fabric to make the fabric white at a desired level by bleaching and OBA treatment.

Factors Influencing Whitening Process :
The factors influencing whitening process are as follows :

a) pH of the bath
b) Temperature of the bath, and
c) Time required for the process.
 
Process Requirements:

Equipment Used
Three types of Thies machines are used for whitening process. These are :
  1. Mini-soft
  2. Eco-soft
  3. Luft-roto
Accessories Used in Whittening
Key accessories used in whitening process are :
  • Mixing tank
  • Machine Tank
  • Bohme meter
  • pH meter
  • Eye protecting glass
  • Hand gloves
  • Sewing machine
  • Hand lifter for carrying the batch, and
  • Gum boot.
Materials / Chemicals Used
Following materials/chemicals are used in the whitening process :
  • Water
  • Steam
  • Compressed Air
  • Wetting agent
  • Detergent
  • Sequestering agent
  • Acid
  • Anti-creasing agent
  • Optical Brightener for Cotton & Polyester
  • Caustic Soda,
  • Hydrogen per Oxide, and
  • Stabilizer, etc.
Operation Procedure

Whitening Process for 100% Cotton
Steps of Whitening Process for 100% Cotton:

The sequence for whitening process for 100% cotton fabric is as follows :

1. Take water in bath at required level
2. Add Detergent, Sequestering Agent, Anti-creasing Agent, Stabilizer
3. Circulate the fabric for 5 minutes at 500C
4. Add Caustic Soda and circulate for 5 minutes at 500C
5. Add Hydrogen per Oxide and circulate for 5 minutes at 500C
6. Add Optical Brightener agent and raise the temperature at 1000C
7. Continue circulating the fabric for 50 minutes at constant temperature (1000C)
8. Circulate the fabric and decrease the temperature at 600C
9. Check the shade with approved shade
10. Rinse and Drain
11. Add Acetic acid and circulate for 10 minutes at 500C
12. Drain
13. Unload
 
Graphical Representation of Whitening Process of 100% Cotton
The whitening process for 100% Cotton can be graphically presented as below :


Whitening Process for Polyester-Cotton Blended Fabric
Steps of Whitening Process for Polyester-Cotton Blended Fabric:

The sequence of Whitening Process for Polyester-Cotton Blended fabric is as follows :

1. Take water in bath at required level
2. Add Detergent, Sequestering Agent, Anti-creasing Agent, Stabilizer
3. Circulate the fabric for 5 minutes at 500C
4. Add Caustic Soda and circulate for 5 minutes at 500C
5. Add Hydrogen per Oxide and circulate for 5 minutes at 500C
6. Add Optical Brightener agent and raise the temperature at 1100C
7. Continue circulating the fabric for 30 minutes at constant temperature (1100C)
8. Circulate the fabric and decrease the temperature at 600C
9. Check the shade with approved shade
10. Rinse and Drain
11. Circulate the fabric for 10 minutes at 800C
12. Drain
13. Add Acetic acid and circulate for 10 minutes at 500C
14. Drain
15. Unload 

Graphical Representation of Whitening Process for Polyester Cotton Blended Fabric
The whitening process for Polyester-Cotton blended fabric can be graphically presented as below :



 

1 comments:

Anonymous said...

Also add how many quantity in fabric
Like
200 kg cotton
Use --- % ditergent
Use----% caustic
Use---% per oxide
Etc

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