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Flow Chart of Pretreatment Process of Wet Processing

Flow Chart of Pretreatment Process of Wet Processing
Rana Sohel
Executive Engineer
Sunman Textile Mills Ltd. Chittagong
Cell: +8801912-420118
Email: rsohel07tex@gmail.com



Introduction:
Pre-treatment means any treatment, which is done before actual process. Pretreatment processes include desizing, scouring and bleaching which make subsequent dyeing and softening processes easy. Flowchart of pretreatment process of wet processing is given here.


Flow Chart of Pretreatment Process of Wet Processing

Level in (P.T to M.T) 60°C


Wetting agent .7g/l


Peroxide stabilizer .5g/l


Anti creasing agent.75g/l

Fabric load(10΄)


Caustic dosing (65 C*̊10́)

run 5́
H2O2 dosing 70ºC *10´

Temperature rise to 105 C̊

run 105 C*30̊΄PH=10.5˜11
Cooling to 78 C̊

Drain

Overflow rinse 10΄ Drain


Level in(P.T to M.T)

Acid 50ºC ˜60 C*̊10́

Peroxide killing injection 80 C*10̊΄ 
check the residual peroxide
Drain

Overflow rinse 5΄

Acid .7g/l to maintain PH 4.5 ̃5

Biopolishing agent 1.5g/l 55ºc*(45ʹ-60´)

Sequestering agent( A.T to M.T)

hot at 90 ̊C*10ʹ 
Overflow rinse 10ʹ 
 
Flow Diagram of Pretreatment