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Nano-Dye’s ‘Disruptive’ Dyeing Technology Scales Up in Bangladesh

How “disruptive” can cotton dyeing be? Pretty disruptive, according to Nano-Dye, a Florida-headquartered firm that claims to have set a new benchmark for the exhaust-dyeing industry by “radically improving” (and, yes, disrupting) the process’s sustainability.

March and May saw the company open its first two continuous, mass production systems in Bangladesh, which will scale up its patent-pending cationic technology for greige cotton and cotton-blend fabrics.

Its “drop-in” process, which requires no new equipment or processes beyond what already exists on the dyeing floor, changes the charge of the cotton molecule so it opposes that of the dye. Then, it “lets nature do all the work.”

Both raw cotton and dye stuff, when submerged in water, take on a negative charge, Nano-Dye explained. The like charges repel one from the other so dye and cotton molecules have trouble adhering.

“We change the negative charge of raw cotton when submerged in water to a positive charge,” the company said. “Now the positive cotton charge and negative dye-stuff charge attract each other, making bonding stronger and easier.”

Besides requiring no salt, the technique is said to use 90 percent less energy and 75 percent less water. It also creates 99 percent less exhaust because the technology fastens 97 percent of the dyes and auxiliary chemicals to the fabric, Nano-Dye said.

This “proactive” dye process, it noted, creates a cleaner effluent and is compliant with Zero Discharge of Hazardous Chemicals standards. What’s more, the resulting fabric is softer in hand, more color-fast and cheaper to produce because of lower dye costs.

With increasing water scarcity and climate change, the Nano-Dye process comes “to clean up a very dirty industry at a critical time,” said Loni Negrin, the company’s founder and CEO.

“Eliminating the possibility to pollute is the only true way to remove pollution,” he said. “Fresh water is our most valuable commodity. We must protect it.”

Between 17 percent to 20 percent of industrial water pollution stems from fabric dyes and treatments, according to the World Bank.