Coating Terms

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Solvent free coatings which use resins with glass transition temperatures higher than room temperature. Powder coatings are comminuted to 20-100 microns. Powders clung to the surface forms a thin film after high temperature baking.
Through these applications, powder coating fluidized by mixing with air is sprayed using a powder gun with an orifice. A high voltage of 40-100 kV connected to a negative electrode at the orifice ionizes air molecules. This cloud of ions is called “corona”. Powder particles pick-up anions when passing through the corona and become negatively charged. Since the object to be coated has become anode because of grounding it attracts particles to its surface. Particles are neutralized when they reach the surface. Loose powder coating film, turns to a tough, durable, continuous, film with good adhesion after baking.