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Gema Switzerland, based in Gossau SG, is an international supplier of electrostatic powder coating equipment. The products range from manual coating to fully automated powder coating. [1] Since 2012, Gema has been a part of the Graco Group, a worldwide supplier of liquid conveyance systems and components. [2]
Electrostatic coating is a manufacturing process that employs charged particles to more efficiently paint a workpiece. Paint, in the form of either powdered particles or atomized liquid, is initially projected towards a conductive workpiece using normal spraying methods, and is then accelerated toward the work piece by a powerful electrostatic charge.
The most common way of applying the powder coating to metal objects is to spray the powder using an electrostatic gun, or corona gun. The gun imparts a negative charge to the powder, which is then sprayed towards the grounded object by mechanical or compressed air spraying and then accelerated toward the workpiece by the powerful electrostatic ...
The electrostatic system is visible only on an external (or indirect) charge applicator, where it appears as a series of 4-8 forward-facing electrodes in a circular array around the bell. It is typically called a 'candelabra' for its resemblance to one. The bell is also used in powder coating. Although the bell looks different from a topcoat bell.
The origins of the cold spray process go back to the beginning of the 20th century, when it was developed and patented by Thurston. [3] The process was further investigated by in the 1950s by Rocheville [4] [3] and was re-discovered in the 1980s at the Institute of Theoretical and Applied Mechanics of the Russian Academy of Science [5] and developed as a coating technology.
Powder coating on glass requires specialized equipment. The biggest challenge is getting the powder to adhere to the glass surface since there is no natural electrostatic attraction like there is with different metals. A clean glass subsurface that will not interfere with the process is essential before beginning the powder coating procedure. [2]
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