Fashion

Waterless Dyeing of Textiles Using CO2

This technology uses CO2 for dyeing polyester fabrics, and has already been embraced by major brands such as IKEA and Nike. DyeCoo Textile Systems release liquid CO2 into the dye vessels of the machine, where heat and pressure transform the liquid CO2 into a supercritical fluid that is used to dye fabrics. The machine then lowers the heat and pressure, and the CO2 leaves the dye vessels as a gas. In the process, 95% of the CO2 is recovered and stored as liquid ready for reuse, which makes DyeCoo an almost closed-loop technology. The result is that no processing water or chemicals are required, with a 50% reduction in energy consumption for the process. Moreover, the process is substantially quicker than conventional textile dyeing methods.

Why you should care

Between 17 and 20% of industrial water pollution is generated by textile dyeing processes, and the industry continues to cause environmental stress on the water resources in developing countries. This CO2-based dyeing process offers a sustainable alternative to conventional water-based dyeing process, in which up to 700 liters of freshwater are typically required to finish just one kg of textiles. In addition, DyeCoo’s process lowers operational costs by up to 45% compared to conventional textile dying, according to the company.

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