Powder coating booths limit powder dispersion and capture overspray in industrial plants. The powder coating process involves dipping an object in coating powder and spraying it with a powder sprayer, then firing it in a kiln. Powder coating booths collect overspray and dust, making them more cost-effective than protective equipment. They can be equipped with filters or dust-collecting technology to capture excess powder.
Powder coating booths are containers dedicated to the powder coating process, generally found in industrial plants. They are primarily used for two related purposes: to limit the dispersion of the powder used in the process and to contain and capture overspray, which is any powder that does not adhere to the object. If dust is released into the general environment of the facility, it can pose a health risk, especially to those who inhale it. Additionally, any oversprayed powder can be collected and reused, an economy not available in wet painting and difficult to achieve in electroplating.
The powder coating process works in two ways: first, an object is dipped into a bath of coating powder, and second, the powder is sprayed onto the object with a powder sprayer. An electrostatic charge, imparted both to the object and to the powder itself, ensures that the powder adheres to the object. After application, the object is fired in a special kiln, during which the powder melts and flows into a hard, smooth surface. In both cases, some of the dust can escape into the surrounding environment, posing a potential hazard to unprotected workers. Powder coating booths are a more cost-effective solution than providing protective equipment for everyone in a facility and establishing protocols to ensure they are actually wearing such equipment.
Powder coating booths are generally not sealed in operation because many applications require an operator to spray powder onto the object, although robotic technology has made it possible to build and operate fully enclosed powder coating booths. The electric charge which adheres the powder to the object is sometimes imparted to the object by a current which passes through the paper clips which suspend it in the air; in other cases, the powder itself is charged as it exits the sprayer nozzle.
Some powder booths are equipped with a variety of filters to capture sprayed powder before it can escape from the booth; others, especially the larger models, use dust-collecting technology to ventilate the cab and collect any excess dust from the exhaust. This is an important consideration for facilities that do a large amount of powder coating, because one of the characteristics that makes powder coating an economical alternative to wet painting or electroplating is that very little powder is lost as waste: many booths coating systems promise to collect more than 90% of oversprayed powder, which can then be reused.
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