Around 200 L of water is used to produce 1 kg of fabric.Īs cotton is consumers’ most favorite fiber with an always accretive demand, continuous researches are taking place to reduce the cost of dyeing cotton as well as the use of water and energy.Īn American company named Huntsman has developed a line of dyes for cotton called Avitera that bonds to the fiber directly and require ¼ to 1/3 less water and 1/3 less energy. To ensure the colorfastness, dyed fabric or yarn is washed over and over again in hot water, creating large amounts of wastewater. Even with an assist from salts and alkali added to the dye solution, cotton takes up only about 75% of the dye. As the surface of cotton fibers is negatively charged, it doesn’t react with negatively charged dye compounds easily. But dyeing cotton is a more water- and heat-intensive process. Generally cotton fabric and polyester fabric are colored using synthetic dyes. Farzana Alam Piya, Research Assistant, Textile Focus
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