Unipolarity powder coating systems including improved tribocharging and corona guns
AssigneeNordson Corporation
InventorsWilliam R. Rehman, Harry J. Lader, James W. Messerly
Life of this patent
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Abstract
A plurality of unconventional negative tribo-charging materials are described for use as the powder contact surfaces in tribocharging and corona powder spray guns, gun components, and powder delivery system components. The invention also provides a short barrel tribo-charging powder spray gun having an interchangeable powder contact insert and nozzle, with turbulence inducing air jets. The invention further provides novel tribocharging and corona gun designs. Improved powder coating systems are made possible wherein, for example, negative tribo guns can be utilized with negative corona guns to coat different parts of the same workpiece in a powder coating system.
Claims14
A system for applying powder coating materials to articles, said system including at least one corona charging spraying apparatus and at least one tribocharging spraying apparatus, said corona charging spraying apparatus having an electrode for charging said powder coating material a first charging polarity, said tribocharging spraying apparatus having a powder flow path, wherein said powder flow path has a charging surface for triboelectrically charging powder coating material which comes in contact with said charging surface, said powder coating material being charged to said first polarity by said charging surface of said tribocharging spraying apparatus.
Dependencies are inferred from the claim text.