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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.
[citation needed] Many different mixtures of coating powders and D-gun settings can be used during detonation gun spraying of a material, all of which influence the final surface characteristics of the sprayed coating. Common powder materials used include but are not limited to: alumina-titania, alumina, tungsten carbide-tungsten-chromium ...
Heat-sensitive carbon fiber tubes coated with a UV curable powder coating. 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.
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.
Spray guns are aligned above the material and the guns are in motion to hit all the grooves of the material. The guns can be moved in a cycle, circle, or can be moved back and forth to apply the paint evenly across the material. Flatline systems are typically large and can paint doors, kitchen cabinets, and other plastic or wooden products.
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.
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]
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. [3]