An electrostatic spray gun is one of the newest products on the market for painting jobs. These are fast, easy and convenient to use for any do it yourself home improvement project. They are becoming increasingly popular with contractors because of their effectiveness in both drying and spraying paint. An electrostatic discharge or EDM gun produces an electrostatic field that attracts and retains electrostatic charges from passing conductors. The gun application applies an electrostatic field to the paint. This causes the paint to have a temporary negative charge, which pulls the paint towards its metallic surface.
An electrostatic spray gun delivers a much less damaging treatment than traditional methods because it does not hit a grounded surface. Traditional sprays can create a “fog” that clogs up a grounded surface, causing the transfer of the charged particles into the room. Traditional spray guns also typically deliver much less spray coverage than the more powerful and versatile electric guns. Electrostatic spray guns can deliver much more coverage at a lower cost than traditional electric sprayers.
The EDM is used to reduce corrosion, shrink heat, and protect fabric, wood, metal and painted surfaces from premature paint wearing. This reduces heat build-up, reduces operating noise and provides a much safer environment for painting projects. One of the benefits of using an electrostatic spray gun is the reduction of paint particle buildup on a painted surface. The sprayer passes a very small amount of charged energy into the paint, which is captured by the coated surface. The small amount of charge that is passed through the material allows the paint to penetrate easily and evenly.
There are two types of electrostatic spraying: direct and indirect. A direct electrostatic spraying system uses a high pressured air or water jet that transfers static charge from the air or water container to the surface to be sprayed. This system produces little blisters as it works, but produces a larger surface area than its counterpart, the indirect electrostatic spraying system. Indirect electrostatic spraying systems use a pressure pot to aid airless transfer. This pot contains a mixture of inert gas (such as argon, krypton, or xenon), and a low level of static charge.
A positively-charged object (positively charged) will repel one another. A negatively-charged object (negatively charged) will attract one another. A negatively-charged surface will become positively-charged when the negatively-charged particles come into contact with the surface and then the attraction process causes the charge to be transferred to the product or material being painted.
Traditional painting applications usually involved hot air and/or water spray guns, and these are still used in some applications. However, the advancements in the technology of electrostatic spray guns have made these items much more user-friendly and less expensive. Spray guns can handle much larger surfaces and can produce a wider variety of colors, finishes, and designs.
When using electrostatic spray guns in electrostatic painting, you will need two of them. One should be placed on the top of the project, and one should be positioned underneath. The locations of these guns will depend upon the type of job and the type of surface that is being painted. For example, if you are applying a red tarp to a building, you would most likely need a gun on the top to assist airless transfer and the bottom one to assist airless drying.
Both types of these electrostatic spray guns have their advantages and disadvantages. For example, the hvlp spray gun operates at a higher forward velocity than the hvlp gun. This means that it can apply a more even coat, but the application process is a bit slower. You can use both types of these guns in conjunction with different types of coating, though the hvlp gun is more commonly used when working with a lower level of coating.