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Dyeing Printing & Finishing

G. Tosi, Tanatex Develop Low-Temp Bleaching Process

G. Tosi S.p.A., Italy, and Tanatex Chemicals B.V., the Netherlands, have developed the Be Green low-temperature bleaching process for mercerized cotton. The process, which allows bleaching at 75°C, is based on a low-temperature peroxide activator and uses specially selected dispersants and surfactants as well as the bleaching activator. The activator controls the peroxide decomposition to help shorten the process for achieving the required whiteness. Tosi reports the system simplifies mercerized yarn process cycles. Benefits include reduced total time and water consumption, a 50-percent reduction in carbon dioxide emissions, and a 25-percent reduction in chemical oxygen demand levels in the effluent. Be Green is suitable for whites to be dyed as well as for full white bleaching including optical bleaching agents.

November/December 2010