![]() ![]() Because salt is very hard and expensive to remove from the effluent, it is most often discharged along with 10–40 percent of the dye used in the process. Traditional cotton-dyeing processes use large amounts of water, energy, and salt to fix the dyes on the fibers. See also: Carbon dioxide Manufactured fiber Polyester resins Polymer Supercritical fluidĬolorZen's process has been specifically designed for cotton dyeing. ![]() In addition, the process does not work on cotton fabric, which accounts for about 35 percent of the global garment market. However, the investment cost of the machines-$2.5 to 4 million (U.S.)-is high. DyeCoo states that their process brings production costs down by 30–50 percent. Other than the dye, no additional chemicals are needed in the dyeing process, and the fabric comes out of the machines dry, which also saves energy by eliminating the need to dry wet fabric. ![]() The advantages of using DyeCoo's machines are that they use no water, produce zero wastewater (all the dye is used), reduce energy consumption by about 50 percent, and are 40 percent faster than traditional processes. DyeCoo has developed waterless dyeing machines that use supercritical carbon dioxide as the solvent to dye polyester fibers and fabric, which comprise about 60 percent of the global garment market. ![]()
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