Faults of Bleaching: The faults
of bleaching are given below,
- Harsh Feeling: As stabilizer if we use sodium silicate then this silicate is precipitate on the fabric and that’s why fabric become harsh.
- Chloramines Reaction: Chloramine reaction will occur in hypochlorite bleaching. So antichlor treatment is done. For that the permanency of whiteness is damaged and fabric becomes yellowish.
- Uneven Bleaching:
- For all types of machine faults.
- Faults in bleaching agent.
- In efficient dosing.
- Inadequate raw materials.
- Alkalinity may remain: To destroy alkalinity we used acetic acid. Dye hydrolysis and dye wastage causes of alkalinity and also reduced the fastness.
- Residual peroxide causes uneven dyeing. Dye wastage and shade variation.
- Iron stain.
Damages of Bleaching: A number of
varieties of product easily oxidized by cellulose which is known as
oxy-cellulose. Now a days scouring and bleaching is a combination process. Loss
of strength is the causes of formation of oxy-cellulose. There are three point
at which oxidizing agent can attack the glucose molecule.
Estimation of Damage:
Share more information on chemical test
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Copper number test.
Methylene blue test.