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Flow Chart of Cotton Bleaching Process

Flow Chart of Cotton Bleaching Process
Md. Abu Sayed
Founder of Textile Apex
Pabna Textile engineering college, Pabna, Bangladesh
Email: sayed1952@facebook.com
Cell : +8801745214773



Introduction:
If cloth is to be finished white or is to be given surface ornamentation, all natural color must be removed by bleaching. This is also necessary if discoloration or stains have occurred during the previous manufacturing process. It can be done in yarn stage as well as in the constructed fabric. The kind of chemicals to be used depends upon the kind of textile fiber of which the fabric is composed. When cloth has been bleached for finishing, it is called bleached goods.
Cotton bleaching process
Cotton bleaching process
In case of cotton goods, 85% of these fabrics are bleached by continuous peroxide methods. In this system, bleaching is done as follows –

Bleaching Flowchart of Cotton Fabric:

Singed goods are put through a rapid de-size steamer

Washing

Impregnation is done with 3% mild solution of caustic sod

Pulled up into a J-box – Temperature is maintained at 1000 C

Fabric is hauled out of the J-box

Hot wash

Impregnation is done with 2% solution of hydrogen per oxide

Put in a second J-box for another hour

Washing

Fabric to the driers


Besides the above bleaching method, some fabrics are bleached by the older method. All the bleaching processes reduce the strength of the fibre. If durability is more important than appearance, the consumer should select grey goods rather than bleached materials. With continued laundering, grey goods will gradually whiten.