There are two main functions of powder booths: to contain Over sprayed material and to recycle powder material for reuse. Efficient recovery of over sprayed material is an important aspect of an electrostatic powder-spray system. Not all booths recycle powder, however. Material recovery is not the only aspect of powder booths that must be considered. Powder booths are vital to contamination free coatings. These booths require specialized ventilation systems, hardware, and protective coverings for workers. Improperly designed or used powder booths often fail to meet safety standards. Air is pulsed from inside a filter in powder booths so that the powder is forced off the filter or cartridge and drops to a collection device. Generally, the powder drops onto a fluidized plate, runs through a sieve, and is transferred back to the feed hopper. Open-faced booths, also called batch booths, limit production and powder recycling. Coating in an open-faced booth normally is a manual-painting operation. Many companies manufacture conveyor spray booths designed for efficient, continuous spray powder application.
By Gary Conner
By George N Bullen FSME