Hardness problems faced in Textile Processing

 

 

In the following table you can see how the presence of Water Hardness affects the various  wet processing stages right from desizing to finishing.

Process

 

Problem

 

Desizing

 

 

Scouring 

 

 

Bleaching

 

Mercerizing 

 

 

 

 

Dyeing 

 

Finishing

 

Deactivate enzymes and makes it in-soluble some size materials  like starch and PVA.

 

Combine with soap, precipitate metal-organic acids. Produce yellowing of off-white shades, reduce cleaning efficiency and water absorption.

 

Decompose bleach baths.

 

Form insoluble metal oxides, reduce absorbency and luster Combine with dyes changing their shades, in-soubise dyes, cause tippy dyeing, reduce dye diffusion and hence results in poor washing and rubbing fastness.

 

Dusting and white patches appear if the hardness is very high.

Form insoluble metal oxides, reduce absorbency and luster. Combine with dyes changing their shades, make them in-soluble, cause tippy dyeing, reduce dye diffusion and hence results in poorwashing and rubbing fastness.

 

 

So the quality of water determines the quality of processing results one can get.

 

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