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Powder coating is a type of coating that is applied as a free-flowing, dry powder. Unlike conventional liquid paint, which is delivered via an evaporating solvent, powder coating is typically applied electrostatically and then cured under heat or with ultraviolet light.
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]
The coating acts as a sacrificial layer when it comes in contact with another surface so that the base material underneath is protected and remains unharmed. [ 2 ] [ 3 ] Abradable Powder Coatings safely reduce operating clearances and friction to improve the efficiency of compressors, pumps, engines, blowers, etc.
A powder feed stock is injected into the gas stream, which accelerates the powder up to 800 m/s. The stream of hot gas and powder is directed towards the surface to be coated. The powder partially melts in the stream, and deposits upon the substrate. The resulting coating has low porosity and high bond strength. [1]
This makes it suitable for coating temperature-sensitive substrates, such as plastics and certain metals, without causing damage or deformation. [9] PVD technologies can be scaled from small laboratory setups to large industrial systems, offering flexibility for different production volumes and sizes.
The molten powder ‘flows’ into the profile and bonds with the steel. The molten powder will become a solid coating, when the ‘gel time’ is over, which usually occurs within few seconds after coating application. The resin part of coating will undergo cross-linking, which is known as “curing” under the hot condition.
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