Denim Wet Process | Bleach Wash | Acid Wash
Zahirul Islam BUTEX
Latest posts by Zahirul Islam BUTEX (see all)
- Denim Wet Process | Bleach Wash | Acid Wash - June 14, 2020
- Acid Wash / Random Wash - May 8, 2020
- Denim Wet Process | Enzyme Wash - April 15, 2020
Denim Wet Process | Bleach Wash | Acid Wash
Denim Wet Process
After coming from the dry process section , Wet process like rinse , enzyme , bleach etc washes are applied on the raw garment to get the desired outlook. In this process the garment goes through several chemical process to remove impurites in different manufacturing process, bring new outlook , make it soft and make ready for the buyer.
Bleach Wash :
The wash which is done to cut more color and bring light shade on denim garments is called bleach wash.This wash is followed by enzyme wash first. For bleaching , hydrogen peroxide ( H2O2 ), Chlorine based and non chlorine based bleaches are used. Sometimes bleach activator is used to activate the bleach. High power bleach called japani bleach ( Synclore ) and low power bleach KCI is used in R R washing for indigo dyed denim according to the design. For sulphur dyed denim fabric , Semi bleach is done by mixing hydrogen peroxide ( 2 g/L ) and caustic soda ( 1 g/L ). The exposure time changes the shade of the garment .Long time exposer brings light shade.
The process sequence of bleach is given below :
Process Sequence of Bleach Wash
Step 01: Desizing
Water is added ( Let, M:L = 1:60 )
↓
Loading garments
↓
Machine started running
↓
Caustic Soda added ( let, 20 g/L )
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Antibackstainer added ( .5 g/L )
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Pumice Stone added if needed ( Let , 5 Kg)
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Steam to raise temp 60°C
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Process time 10 minutes
↓
Drop liquor
↓
Rinse 2X
Step 02: Enzyme Wash
Water is added ( Let, M:L = 1:60 )
↓
Machine started running
↓
Neutral Enzyme added ( let, 3 g/L )
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Antibackstainer added ( .5 g/L )
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Pumice Stone added ( Let , 10 Kg)
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Steam to raise temp 50°C
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Process time 40 minutes
↓
Drop liquor
Step 03: Bleaching
Water is added ( Let, M:L = 1:60 )
↓
Machine started running
↓
Bleach ( Cl based – liquid ) ( let , 15 ml/L )
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Soda Ash added ( let , 1 g/L )
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raise temp 60°C
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Process time 10 minutes
↓
Drop liquor
Step 04: Neutral Wash
Water is added ( Let, M:L = 1:60 )
↓
Machine started running
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Sodium meta bysulphate ( 1 g/L )
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Steam to raise temp 45°C
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Process time 10 minutes
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Drop liquor
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Remove pumice Stone
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Rinse 2X
↓
Softening
↓
Hydroextraction
↓
Drying
Acid wash / Random wash
At present times, the most popular denim garments are random washed among the fashionable people. When solid washed the fading, effects are even and uniform in the garments but when random washed effects are uneven.
Process Sequence of Acid/Random Wash :
Step 01: Desizing
Water is added ( Let, M:L = 1:60 )
↓
Loading garments
↓
Machine started running
↓
Desizing chemicals added ( let, 2 g/L )
↓
Antibackstainer added ( .5 g/L )
↓
Pumice Stone added if needed ( Let , 5 Kg)
↓
Steam to raise temp 60°C
↓
Process time 10 minutes
↓
Drop liquor
↓
Rinse 2X
Step 02: Enzyme Wash
Water is added ( Let, M:L = 1:60 )
↓
Machine started running
↓
Neutral Enzyme added ( let, 3 g/L )
↓
Antibackstainer added ( .5 g/L )
↓
Pumice Stone added ( Let , 10 Kg)
↓
Steam to raise temp 50°C
↓
Process time 40 minutes
↓
Drop liquor
↓
Hydro-extraction ( 3 mins ) not dry
Step 03: Acid / Random Wash
Hydro-extracted garments loading
↓
Spread out treated stones in the machine
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Dry tumble for 4-5 mins
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Check effect ( if ok )
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Neutralization
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Overall bleach if needed ( 4 min , 50oc )
↓
Neutralization
↓
Softening
↓
Hydro extraction
↓
Drying
↓
Quality Check & Delivery
Dip Wash or Dip dyeing :
In garments dyeing, dip dyeing is becoming more popular day by day as the fashion trend and customer demand. Due to cheap and easy process it is as popular to the manufacturers. It is also as called gradient dyeing. It is the process, the fully-fashioned garments are arranged to dip into a dye bath (vessel, bucket, bowl etc.) accordingly a predetermined area or height. This process runs again and again. According to demand, garments are to be soaked into dye bath up to a certain limit for enough time. To dye up the garment as deeper shade to light shade from bottom to top the gradient time will be maintained for certain area of the garment.
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Zahirul Islam BUTEX
Latest posts by Zahirul Islam BUTEX (see all)
- Denim Wet Process | Bleach Wash | Acid Wash - June 14, 2020
- Acid Wash / Random Wash - May 8, 2020
- Denim Wet Process | Enzyme Wash - April 15, 2020
