DOPE DYEING Dope dyeing is a dyeing technique typical of recycled polyester fabric. It involves adding color pigment “upstream”, directly to the melted plastic solution before the fiber is made. Unlike traditional processes where yarns are produced and then dyed, with dope dyeing the pigments are trapped inside the plastic after it cools to a solid form, becoming part of the new, strong yarn. With this approach, dyeing can be done by hot transfer without immersion in water. 13%-20% less CO2 54%-67% less energy 99% less water 35%-64% less waste Material Energy (MJ) Water (l) Waste (kg) GHG (kg CO2) Virgin Polyester 138 60 0.14-0.57 15 Dope Dyeing Recy Polyester 45-63 0.44 0.20-0.26 12-13 Production impact per 1 kg Woven Polyester Fabric
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