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Preparation- cotton 2 (Scouring (Reaction (Saponification – sodium…
Preparation- cotton 2
Scouring
Natural or added oily/fatty impurities can be removed
Mian chemicals: Sodium hydroxide and detergent
Reaction
Saponification – sodium hydroxide (caustic soda)
Emulsification – detergent
Process
Effectiveness
Water absorbency
Bleanching
Agents
hydrogen peroxide
both batchwise and continuous process
Combined scouring and bleaching :10-11 and sodium hydroxide is used for adjusting this pH range
sodium chlorite
sodium hypochlorite
chlorine gas which is harmful to human x
open system
Effectiveness
Whiteness index
and
fluidity test
Pin-hole
reaction between hydrogen peroxide and copper/iron.
mercerization
The cross-sectional view of cotton will change from bean-shape to circular shape
Effectiveness
Cross-sectional view
and
dyeability
Fluorescent whitening
Fluorescent whitening agent
good colourfastness to washing and light
Not be removed by washing or light (GOOD)
no singeing and desizing processes for cotton knitted fabric