Foil Company Improves Wet Scrubbing Performance While Reducing Effluent Flows - Case Study
A major supplier of copper foil operates several plants in the U.S. The production process includes plating a thin strip of copper onto a steel roller, coiling the foil and shipping it to the end user. The copper foil line utilizes large steel rollers which are regularly hard chrome plated for wear resistance and texture. Roll plating is done in-house, in three large hard chrome plating tanks at 10,000-plus amperes per tank. Each roll is plated with about 1/3 submersion and rotated during plating, similar to the method used for (much smaller) roto-gravure rolls. Gravure plating applications have proven to emit a smaller and more difficult chrome mist to control, but Mapco guaranteed compliance with .015 mg/dscm regardless, based on success at a different, similar facility. The exhaust system design includes tank covers that allow the large (68' X 132') plating tanks to be exhausted with less than 2,000 CFM per tank.