Nike launches its second garment product dyed using the CO2 waterless dyeing technology first developed by the Dutch DyeCoo technology company. Nike’s ColorDry tennis polo shirt uses a waterless dyeing method, which also avoids adding chemical additives during the fabric dyeing process. In addition, the polo shirt is made of 96% recycled polyester, which is also proof of Nike’s support for sustainable development. One polo shirt is equivalent to using approximately 11 PET bottles.
Nike told the media: “As an innovative company, Nike not only emphasizes innovation in product design, but also innovates how to manufacture products. The new ColorDry tennis polo shirt is an example of Nike’s pursuit of sustainable materials and innovative manufacturing technologies. Reduce the impact on the environment while also delivering the superior performance of the tennis shirt to athletes. At present, waterless dyeing technology is still in its early stages of development, but it is still part of Nike’s commitment to reduce dependence on limited resources such as water.”
Carbon dioxide dyeing system heats carbon dioxide to above 31°C and pressurizes it to above 74 bar (atmospheric pressure), at which point it reaches a supercritical state. Supercritical fluid is a substance whose temperature and pressure are higher than its critical point. Above this point, no obvious liquid and gas phenomena will occur. Therefore, CO 2 has the characteristics of both liquid and gas.
DyeCoo’s dyeing machine uses a stainless steel dye vat in which the supercritical fluid CO2 can be used to dye textile materials without water. Supercritical fluid CO2 can improve the efficiency of waterless dyeing of man-made fibers. This process can ease the diffusion of disperse dyes within the fiber. In the same dye vat, fabric drying and excess dye removal are also performed. During the process, excess recycled dye will not be wasted and can be recovered and recycled. DyCoo claims that CO2 waterless dyeing only uses half the energy of traditional dyeing processes.
Various estimates show that dyeing a T-shirt using traditional methods requires approximately 30 liters of water.
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