Caustic Wash | Flow Chart of Caustic Wash

Caustic Wash:
According to market demand & fashion garments industry does different types of wash. Caustic wash is one of them. Caustic wash is the new concept in the market trend. In order to have caustic wash effect, we must start from printing of fabrics. Normally before we do printing on cotton fabrics, we must treat the raw fabric in boiling water with”Caustic” which is a chemical with corrosive nature, or strong cleaning power especially for grease. During this process, all the dirt, grease, fine particles of cotton seeds and all foreign materials are cleaned up leaving only the pure cotton fiber in the fabric for printing. When printing is done on this well cleaned fabric, the printing will stay clearly and securely on the fabric.

However, when we want to do caustic wash on garments, we just do the opposite of the above; before printing we do not clean the raw fabric with caustic treatment. We just apply the printing on the raw fabric so that about 30% of the printing done on the surface may eventually go away.

Caustic washed jeans
Fig: Caustic washed jeans
Finally, when garments are made of this fabric and ready for wash, we will wash them with caustic and hot water. At this time about 30% of the printing will be washed away together with the foreign materials, leaving about 70% of the printing on the fabric making the design or stripe nice and soft. This is the look we call “caustic wash”.

For caustic wash, the printing must bbe pigment print with binder and baking treatment to an extent that the color will stay on the fabric only fairly securely to coincide with the caustic wash to be done later. In this article I will explain flow chart of caustic wash process step by step that are given below.

Flow Chart of Caustic Wash:

Step 01: Desizing

Water is added (400 Lt)

Garments are added

Machine started running

320 gm Detergent added

320gm Caustic soda added

Temperature raise to 60°C

Time 20-60 minutes

Drop the liquor

Add water and cold wash

Step 02: Neutral Wash

Add water 300 lit

Temperature cold

Acetic acid 150gm added

Time 5 minutes

Step 03: Softening

Water is added (400 Lt)

Garments are added

Machine started running

240 gm Softener added

200gm Acetic acid added

160gm silicon softener added

Temperature Cold

Time 15 minutes

Drop the liquor

Unlaod garments on trolley

Step 04: Hydro Extracting

Load the garments on m/c

R.P.M 700-900

Time 3-5 minutes

Unload the garments on trolley

Step 05: Dyeing

Load the garments on dryer m/c

Temp 60- 70°C

Time 40-50 minutes

Time 10-15 minutes for cold dry

Unload the garments

Quality checking

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Mazharul Islam Kiron is a textile consultant and researcher on online business promotion. He is working with one European textile machinery company as a country agent. He is also a contributor of Wikipedia.

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