Metal Finishing Guide Book


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Fig. 9. Cartridge booth system. from this containment air stream depending upon if the system will reclaim this powder or employ a spray-to-waste strategy, the number of reclaimed powders, and the time available to perform the color change. Cyclone Booth System A cyclone powder booth system, as pictured in Fig. 8, is made up of a spray booth, cyclone(s), a cartridge collector, and possibly ductwork. The spray booth can be made of metal, plastic, or composite sandwich designs. Metal booths provides strength and durability but attract more powder that will prolong color change time. Plastic will allow more light into the booth and will attract less powder, reducing color change time. Composite sandwich designs offer strength and attract the least power, significantly improving color change time. All powder booths should provide a smooth interior to facilitate easy and thorough cleaning. Ductwork connection(s) can be at one of several locations. The preferred method is to locate the ductwork connection in the base of the booth as this provides a down-draft air flow inside the booth helping to keep it clean. The booth may have devices, such as baffles, to help control air flow within the booth, touch-up openings to provide access for manual spraying, and gun slots to provide access for automatic equipment. The cyclone is designed to separate most of the powder from the airflow before entering the filtration section. This has several benefits. First, air entering the filter is "precleaned," which will lower the loading on the filter media. This translates to longer filter life. Second, the powder collected in the cyclone can be easily recycled. Since the cyclone is a cleanable device, color change is attainable without additional equipment. Multiple cyclones are used when air flow is so high that one cyclone isn't practical for a given plant ceiling height. Twin cyclones are used in parallel before the filtration section. Cyclone efficiency can vary by manufacturer and design with some systems delivering in excess of 90% of the powder into the reclaim device. 217

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