Paint overspray can account for 20 – 70% of the total paint sprayed.
If this overspray is not properly detackified:
To prevent clogging of the sump drain and sewer system the accumulated paint must be periodically removed from the sump. This is generally accomplished by shoveling the paint out of the equipment, which is costly and time consuming.
It is preferable to detackify the paint because:
Even if paint is properly detackified but is not removed from the paint booth system, serious problems can still occur. Paint provides an excellent growth source for pathogenic and odor producing bacteria. Additionally, paint solids can cause serious foaming, which can cut off the flow of air from the booth.
Different kinds of booths can mean different challenges for paint detackification. There are two types of spray booths discussed in this guide, the Downdraft and the Sidedraft. Different booths mean different air velocities and paths of air flow. This also means there are different places within the booth where detackification and scrubbing occurs, often leading to different methods of recirculating water back into the system.
Air is pumped in through the ceiling and flows down past where the painting is taking place. The paint-laden air flows across a flooded floor pan and down through center slots or tubs (rectangular or circular). As the paint-laden air passes down through this area, the paint is being scrubbed from the air to the water. The air/paint/water mixture is then directed into an impact pond to absorb some of the energy of the mixing, slowing it down and minimizing misting. The scrubbed air is directed through a series of baffles that help to demist the air. This prevents water from leaving the under-booth area. The water from this booth overflows the impact pond, enters a trough and flows to a pit or sump. Paint is normally separated from the water in this area. The paint solids free water is recirculated back to the booth flood pan.
Commonly used for painting automobile parts, equipment, and other painted materials. In side draft booths, air enters from one
side of the booth and exits the opposite side. After painting, the overspray laden air is pulled through a curtain of water, which scrubs the paint from the air to the water. The relatively clean air is exhausts through the stack. The water from the curtain falls into a pan and is recirculated back to the top of the water curtain. Water in these booths is laden with paint and need to be cleaned out often. Due to a minimum amount of scrubbing action and limited water flow, this type of booth can be difficult to treat.
Paint overspray that has been detackified will do one of three things: float, sink, or remain dispersed in the paint booth water system. Sludge systems have been designed with each of these concepts in mind. In North America, it is more common to float than disperse the paint. The separation of the paint from the booth water can be floated in a pit and/or again in a consolidation unit. In a booth system that contains a pit, water from the booth enters the pit, at one side, and flows to the far end. At the far end, clean water is pumped from the bottom of the pit and recirculated back to the paint spray booth. The floating paint travels over a weir and is removed from the water in the consolidation unit.
Over the years, as paint formulas have changed, so have the chemical Detackification treatments. Various procedures and techniques have been tried to detackify paint.
The most difficult paint to treat is paint without pigment or filters. Since there are no solids to provide a base for the detackifying agents to act. Solids-free coating materials are used widely on automobiles because of the increased protection it provides to the finish of the automobile.
The most versatile product for detackifying paint is an organic coagulant combined with a flocculant, since it treats multiple types of paint.
Treating paint over spray with GreenFloc Natural Coagulants will allow:
GreenFloc, a Dober company, can help you maximize the treatment of paint over spray while minimizing your treatment costs.