Paint spray booths are commonly used in a wide range of industries, most notably in aerospace, large equipment and industrial manufacturing. Spray paint booths allow parts to be evenly painted, hugely reducing labour costs. However, the booth itself needs a filtration system, or a way for excess paint particles to be removed. There are two main choices for this: dry or water wash filtration.
Water Wash Filtration
In a spray booth with a water wash filtration, the overspray is collected and then trapped in a water curtain. It is then deposited in a collection tank, which fills with a kind of paint sludge that needs to be emptied, and the tank must be cleaned. The advantages are that filters do not need to be changed regularly, but on the flip side, the waste needs to be emptied frequently and correctly. The water is ionized so it bonds with the paint, which either rises to the top or sinks to the bottom as sludge. This makes it easier to remove the paint particles, which have to be deposited as hazardous waster. Many water wash filtration units have a built-in waste removal process. Water wash filtration systems can be easily customized and can deal with high usage, making them ideal for large production plants. The cost of chemicals and the labour involved in sludge removal also need considering.
Dry Spray Booth Filtration
Dry filtration systems use layers of filters to remove paint particles from the air. The maintenance of such a system is often lower, although the filters need replacing frequently. The cost and installation are less than a water wash filtration system, but dry filtration units are simply not able to deal with the large volumes that water wash filtration systems can. Dry systems cannot deal with every type of paint compound, either.
Filtration for paint spray booths is a really important part of the manufacturing process as paint particles can be harmful to both people and the environment. The decision to go for a water wash or dry filter is based on many factors. Click here to find out more about choosing the right spray booth filters.
Both water wash and dry filtration offer benefits, and the scale of your operation is often a determining factor. You also need to think about price, maintenance, and space.