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US 6,032,871 AGranted
Electrostatic coating process
AssigneeABB Research Ltd.
InventorsGunter Borner, Hans Christoph Nienburg, Jorg Sopka
Life of this patent
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Abstract
Workpieces are electrostatically coated with powder materials. It is possible to attain a relatively large coating thickness in a single operation by simultaneously or alternately coating with powder particles that have a different electrical charge. The process can be used in applying single-component or multi-component coating materials.
Claims7
A process for electrostatically coating a workpiece with coating materials, which comprises:
- electrically charging powder particles of a coating material with a different electrical charge by means of two electrostatic application devices of opposite polarity;
- coating a workpiece with the differently charged powder particles by simultaneously operating the at least two electrostatic application devices, wherein one of the electrostatic application devices is a corona spray gun and the other electrostatic application devices is a triboelectric spray gun.
Dependencies are inferred from the claim text.