Metal Finishing Guide Book


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loaded. Fiberglass filters are a little less efficient, showing good efficiency and a somewhat better,but still only fair, holding capacity. The front surface loads quickly, which is also disadvantageous. Combination Baffle/Strainers Any time you combine the best technologies from two different sources, the end product is one that's better than each component. So it only makes sense that the combination of the superior properties of baffle filters and strainer filters produces a filter with the highest effectiveness possible. These high-capacity filters can range as high as 99.5% efficiency, depending on paint formulation. Fig. 16. Vehicular downdraft spray booth. Water-Wash Booths Water-wash spray booths (see Fig. 13) use a type of air washing action to trap paint particles. They are designed to continually break up paint accumulating on the surface of the tanks into minute, easier to handle solid particles of paint or a skimming system. Overspray laden air is first drawn into the exhaust chamber. The heavier paint particles are separated from the air and forced into a water curtain at the chamber front. The air then enters a washer where it passes in front of a manifold containing numerous water-spray nozzles where it is washed a second time. In addition to passing these water nozzles, the air is forced to make numerous turns throughout its journey. Centrifugal force discards water and solid particles at each turn. The deposited water and solid particles to this point Fig. 17. Prep work stations. fall back into the water tank. Water-wash booths are ideally suited for heavier spray rates (over 20 gal/8-hr shift/10 ft of chamber width); all types of paints including primers, topcoats, enamels, epoxies, urethanes, and water reducibles; finishing operations that 783

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