Flow Chart of Stripping Process for Reactive Dye on Cotton Fabric

Stripping Process: 

Stripping becomes necessary when uneven dyeing occurs. By stripping azo group (–N=N–) from the dye is removed. It is a critical procedure and it is required to match the shade of the dyed fabric with the buyer’s requirement. Here, a flowchart of the Stripping Process for Reactive Dye on cotton fabric is given below.

Flow Chart of Stripping Process for Reactive Dye on Cotton Fabric Dyeing:

The stripping process for cotton fabric is given below:

Fabric received from the batching section
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The required amount of water was taken into the machine
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The fabric was loaded and run for 5-10 minutes at normal temperature
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The wetting agent, anti creasing agent were added at a time for 5 minutes
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Caustic was dosing at normal temperature for 5 minutes
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Run for 10 min.
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Temperature increases at 110 0C and continues for 40 min.
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Cooling at 80 0C
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Hydros injects for 5 min.
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The temperature increased to 110 0C for 10 min.
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Run for 30 min.
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Cooling at 80 0C
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Sample check
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Rinsing for 15 min.
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Hot wash
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Cold Wash
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Unload the Fabric

Stripping is one of the reproduction processes, used in textile finishing, removing dyes from the colored fabric. The process is either termed as ‘back stripping’ or ‘destructive stripping’. In back stripping only the depth of the shade is changed while in destructive stripping the dyes are chemically altered. such as dyes containing an azo group (−N=N-) can be chemically reduced to an almost colorless amine compound by using chemical reducing agents. Sometimes for the analysis of dyes or dyed fabrics, dyes may need to be stripped from the surface by either destructive or non-destructive methods. Non-destructive stripping is essential when the amount of dye on the fiber has to be estimated, or the dye has to be identified or analyzed by techniques such as chromatography. Laboratory methods for stripping dyes seldom mirror those used in bulk processing, since these are usually destructive methods based on strongly reductive or oxidative methods.