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Waterless Dyeing Technique(DYECOO)

Date post: 29-Oct-2015
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A brief presentation on DyeCoo textile systems, which literally meant dyeing with CO 2.
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WATERLESS DYEING TECHNIQUE DYECOO
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Page 1: Waterless Dyeing Technique(DYECOO)

WATERLESS DYEING TECHNIQUE

DYECOO

Page 2: Waterless Dyeing Technique(DYECOO)

The textile industry is believed to be one of the biggest consumers of water. In conventional textile dyeing, large amounts of water are used both in terms of intake of fresh water and disposal of wastewater. On average, an estimated 100-150 litres of water is needed to process 1 kg of textile material, and with some 28 billion kg's of textiles being dyed annually, it requires no great minds to figure out how much water can be saved annually which otherwise will be consumed by the industry. Hence, the elimination of process water and chemicals would be a real breakthrough for the textile dyeing industry. We are discussing in detail the new waterless dyeing equipment and process developed by a Netherland-based pioneer DyeCoo.

Page 3: Waterless Dyeing Technique(DYECOO)

INTRODUCTION

The concept of 'Waterless‘ dyeing was invented 25 years ago in Germany, but to develop a commercially viable machine was a daunting task. This was overcome by DyeCoo textile systems, which literally meant dyeing with CO 2.

The 'Waterless' dyeing machines from the company, uses supercritical carbon instead of water.

Page 4: Waterless Dyeing Technique(DYECOO)

When carbon dioxide is heated above 31°C and pressurised above 74 bar, it becomes supercritical, a state of matter that can be seen as an expanded liquid, or a heavily compressed gas.

In short, above the critical point, carbon dioxide has properties of both, a liquid and a gas. In this way supercritical CO 2, has liquid-like densities and gas-like low viscosities and diffusion properties, which not only leads to shorter dyeing times compared to water-based dyeing, but is also advantageous for dissolving disperse dyes.

Page 5: Waterless Dyeing Technique(DYECOO)

LIMITATION

As of now, only polyester dyeing is possible with supercritical fluid CO 2 with the help of modified disperse dyes.

It causes the polymer fibre to swell, allowing the disperse dye to diffuse and penetrate the pore and capillary structure of the fibres. This deep penetration also provides effective colouration of polymers.

Page 6: Waterless Dyeing Technique(DYECOO)

PROCESS The dyeing takes place in the main body vessel of the

machine. During the dyeing process, the CO 2 is circulated

through a heat exchanger, a vessel where the dye is dissolved and through a vessel where the dye is delivered to the textile on a beam.

When the desired colouration is attained, dye is still left in the CO2, which is removed by passing the CO2 through a pressure reducing valve into a separator vessel.

In the separator, the CO 2 is gasified, so that the dye precipitates and the clean CO 2 can be recycled by pumping it back to the dyeing vessel.

Page 7: Waterless Dyeing Technique(DYECOO)

The advantages of using CO2 are manifold.The CO, can be recycled easily, up to 90% after precipitation of the extracted matter in a separator.

Currently, the process is limited to dyeing of scoured polyester fabric only, in batches of 100 to 150 kg, although DyeCoo and its partners are also developing reactive dyes for cellulosic fabrics to be available for use in this process.

Page 8: Waterless Dyeing Technique(DYECOO)

The technology behind the process was unveiled to the world only last year. Nike had earlier in 2012 adopted the waterless dyeing technique from the company

"Waterlessdyeing is a significant step in our journey to serve both the athlete and the planet, and this partnership reinforcesNike's long-term strategyand deep commitment toinnovation and sustainability"

"We believethis technology has thepotential to revolutionizetextile manufacturing.”

Nike’s Vice President Eric Spunk says

Page 9: Waterless Dyeing Technique(DYECOO)

CONCLUSION

There is no water consumption, no use of chemicals, no drying and it is twice as fast.This also makes it attractive in terms of energy. It is consequently not surprising that people from around the world have shown interest in this new machine.

Page 10: Waterless Dyeing Technique(DYECOO)

BY:AVINASHABHISHEK

THANK YOU


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