8/12/2019 _Textile Processing - Textile Fabric Scouring and Bleaching _ Peroxide Bleac

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ile Processing - Textile fabric Scouring and Bleaching | Peroxide bleaching of fabric | Cotton fabric bleaching | Bleaching of cellulose|

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Cotton - Scouring and Bleaching -Pretreatment

ydrogen Peroxide Bleaching

eaching is an operation to remove the coloured impurities from

xtile fibers. Cotton in its natural form contains so many minerals,

axes, proteins and colouring matters, etc. In order to attain a

ght substrate for dyeing, bleaching or printing and to make the

bric uniformly water absorbant, a pretreatment is essential. So

e first and foremost textile processing operation is called

etreatment, that remove remove the unwanted matters, such as

lor, minerals, waxes and oils and stains from the greige material.

he pretreament operation untilizes a lot of water and the quality

water plays a vital role in the cleansing of textile materials.

etter the quality of water, better will be the processed goods.

s water and its quality play a very important role in wet

ocessing, let us have a brief look into the quality of water

quired for wet processing, with an emphasis on reactive dyeing.

e get water from various sources, like river, ponds, shallow wells

d deep bore wells. According to the source of water, it contains

any dissolved and suspended impurities. The water from a running river, contains many dissolved salts (solids) like Sulph

hlorides, silicates, Carbonates and Bicarbonates of heavy earth metals like Calcium, Magnesium, Iron, Aluminums, Sodium etc

tio of these salts varies according to the source of water. The general requirements of the water used in textile processin

ven below:

he water should be colorless, clear and free from suspended impurities.

hould not be hard and have the tendency to deposit, scale on fabric or on water supply structures.

should be non-corrosive.should be free from metals such as iron, manganese, aluminums and copper

should neither be too alkaline or acidic.

olor is normally an indication of the presence of suspended and dissolved salts that may affect the fiber/yarn/fabric. So it has

moved from water prior use in processing, by a suitable de-coloration technique.

urbidity or Suspended solids are due to a fine suspension of inorganic salts like (clay. silica, calcium carbonate) or organic

vided vegetable matter like algae, micro-organism etc. This should also be removed using a suitable filtration technique.

ssolved solids - in water treatment and analysis this term is called Total Dissolved Solids (TDS). The TDSreflects the presen

wanted elements in dissolved form, which has to be removed using a suitable method. Good quality watershould not have aore than 150 ppm.

H value Water with a pH valueof more than 7 is alkaline and one below 7 is acidic. Most of the textile processing treatment

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8/12/2019 _Textile Processing - Textile Fabric Scouring and Bleaching _ Peroxide Bleac

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ile Processing - Textile fabric Scouring and Bleaching | Peroxide bleaching of fabric | Cotton fabric bleaching | Bleaching of cellulose|

//www.thesmarttime.com/processing/pretreatment.html[2/18/2010 5:01:36 PM]

ependent on pH values.

ardness (Calcium and Magnesium) the presence of Calcium and Magnesium salts in water is called hardness of water.

emporary Hardness: The presence of bicarbonates of Calcium and Magnesium in water is called temporary hardness. Whe

ater containing these salts are heated to boil, the soluble bicarbonate salts will become insoluble carbonates and precipitate anardness disappears.

ermanent Hardness: The presence of carbonates, sulphates and chlorides of Calcium and Magnesium are called perm

ardness, as this hardness cannot be removed by simple heating.elated topics of your i nterest:

Basic Requirements for Hydrogen Peroxide BleachingWater Hardness - How does it affects Textile Processing?

Determination of Water Hardness - How to Test details?Industrial Water Softening Treatment - A detailed Ion Exchange MethodA simple pretreatment of cotton - Useful tips and recipes of Peroxide BleachingBio-scouring - technique, tips and benefits

Assessment of Bleached GoodsUseful Links on Water

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