4.6. Disadvantages:

1. High pressure and high temperature are observed during the process.
2. The system requires a lot of money.

Conclusion:

It seems apparent from the literatures that ultrasound holds promise in dyeing of variety of substrates. The ultrasonic cavitation accelerates the rate of dyeing and increases the dye uptake on fabric. The typical dyeing process involved the use of chemicals and thermal energy, which can be reduced, by using ultrasound energy. Among the wet processes, application to dyeing seems to be most advantageous, followed by finishing and preparation processes. There may be a possibility of reducing the pollution load on effluent water.

Electrochemical dyeing, in which chemical reducing agents are replaced by electrons from the electric current and effluent contaminating substances can be dispensed with altogether.

The plasma technology is considered to be very interesting future oriented process owing to its environmental acceptability and wide range of applications. Since recently, however, the plasma Technology is being introduced in textile industry as well. The processes do not produce waste waters or chemical effluents, so the methods are economical and reduce the environmental impacts caused by the chemical textile industry.

Dyeing with super critical CO₂ is still at its infancy. It has been proved time and again that its successful at laboratory scale. Large amount of research input is needed for system integration. Dyeing with this system has been found successful with synthetic as well as natural fibers. With evolution of time Supercritical CO2 dyeing would be the order of the DAY!!!

References

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