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Ozone Fading Of Denim: Waterless Denim Finishing

Ozone Fading Of Denim: Waterless Denim Finishing

Ozone Fading Of Denim: Waterless Denim Finishing

Ozone Fading on Denim:
Using this technique, the garment tin strength out live bleached. Bleaching of denim garment is done inwards a washing machine alongside ozone dissolved inwards water. Denim garments tin strength out besides live bleached or faded yesteryear using ozone gas inwards a unopen chamber. The advantages associated alongside this procedure are that:
  • Colour removal is possible without losing strength.
  • This method is uncomplicated together with environmentally friendly because, subsequently laundering, ozonized H2O tin strength out easily live deozonized yesteryear UV radiation.
Ozone typically acts equally a mild bleaching agent equally good equally a sterilizing agent. In this technique of denim washing, the garment is bleached alongside ozone dissolved inwards H2O inwards a washing machine. However, this technique tin strength out besides live carried out inwards a unopen sleeping room yesteryear using ozone gas.

Advantages of ozone finishing for denim:
The advantages of this method are:
  • A minimum loss of strength
  • It is a uncomplicated method that is environmentally friendly.
  • Low unloose energy costs for processing
  • Short handling fourth dimension
Ozone fading techniques for denim finishing:
The ozonised H2O subsequently laundering tin strength out easily live deozonised yesteryear ultraviolet radiation. Nowadays, ozone fading tin strength out besides live achieved yesteryear plasma equipment. Under the influence of plasma treatment, high unloose energy electrons are formed. Some of the high unloose energy electrons react alongside wet inwards air together with a mixture of radicals is generated.

After laundering the ozonized H2O tin strength out easily live deozonized yesteryear UV radiation. Ozone fading tin strength out besides live achieved yesteryear plasma equipment. Under plasma treatment, high-energy electrons are formed. Some of the high-energy electrons react alongside wet inwards air together with a mixture of radicals is generated. During the generation of ozone plasma, a combination of charged particles, gratis radicals together with UV lite is generated. The UV light, which is the by-product of the plasma handling process, besides contributes to production of the %OH radical. The hydroxyl radical %OH is the virtually oxidative radical amidst radicals generated inwards the plasma procedure together with is the original radical responsible for degradation of indigo dye inwards textile materials. The %OH tin strength out oxidize indigo dye molecules (RH), producing organic radicals, R%, which are highly reactive together with tin strength out live farther oxidized. As a result, the color fading trial of the indigo-dyed textile is achieved.

 is done inwards a washing machine alongside ozone dissolved inwards H2O Ozone Fading of Denim: Waterless Denim Finishing
Fig: Ozone faded denim
The K/S (in which K is the absorption coefficient at a specific wavelength together with south is the scattering coefficient) values of dissimilar treated denim fabrics are shown inwards Table. From the results, it is noted that the differently treated denim fabrics receive got lower K/S values than the untreated denim fabric. The K/S value is linearly related to concentration of the colourant inwards the medium together with it tin strength out live concluded that a paler shade is obtained subsequently dissimilar treatments. Without the cellulase treatment, the plasma induced ozone treated denim stuff has a paler shade than the enzyme desized denim stuff because during the plasma induced ozone treatment, ozone oxidises indigo dyes on the denim stuff surface leading to a color fading effect.

Table: Colour properties of dissimilar denim fabrics

Fabric sample
K/S value
Untreated
430.58
Plasma induced ozone treated
382.18
Enzyme desized
425.46
Plasma induced ozone treated followed yesteryear cellulase treatment
365.32
Enzyme desized followed yesteryear cellulase treatment
378.90

However, inwards the illustration of enzyme desizing, the enzyme alone reacts alongside the sizing stuff at the fibre surface together with no breakdown of indigo dyes molecules occurs. Therefore, no pregnant shade alter takes place. In the illustration of cellulase treatment, cellulase inwards the aqueous medium tin strength out penetrate effectively into the denim fabric. The enzymatic hydrolysis induced yesteryear cellulase inwards the plasma induced ozone treated denim stuff is to a greater extent than severe than the enzyme desized denim fabric. As a result, the cellulase handling for plasma induced ozone treated denim stuff gives a paler shade than the enzyme desized denim fabric.


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  7. Denim Whiskering Process
  8. Tinting Process inwards Denim Garments
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References:
  1. Denim : Manufacture, Finishing together with Applications. Edited yesteryear Roshan Paul
  2. Sustainability inwards Denim. Editors: Subramanian Muthu 
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