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Apparatus for electrostatic coating of objects
| Details |
Inventors: Behr, Hans; Vetter, Kurt; Schneider, Rolf; Luderer, Fred;
Assignee: Behr-Industrieanlagen GmbH & Co. (Ingersheim, DE)
Primary Examiner: Kashnikow; Andres
Assistant Examiner: Forman; Michael J.
Attorney, Agent or Firm: Reising, Ethington, Barnard, Perry & Milton
In an apparatus for the use of so-called water enamels or some other similarly conductive coating material, the electrical field for charging the sprayed particles is produced between the grounded spraying edge (6) of a bell-shaped atomizer (10) and a large number of external electrodes (10) inserted into an annular element (20) made of an insulating material. |
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DETAILED DESCRIPTION What is claimed is: 1.
An apparatus for electrostatic coating of objects with an electrically conductive coating material comprising: a rotary atomizer (1) including a spraying head (2); an external housing (7) connected to said spraying head (2); a line supplying coating material from a storage system to a spraying edge (6) on said spraying head, said line and the coating material being at ground potential to said spraying head; charging electrodes (10) distributed radially around said spraying head (2) on a circle concentric with the axis thereof and spaced at uniform angular distances, said electrodes (10) being connected to a high voltage source for the purpose of producing an electrical field for charging the coating material, the radial distance between the front ends of said electrodes (10) facing the object to be coated and said spraying head (2) being twice the diameter of said spraying head (2); an electrode mounting means (20) made of an insulating material in which said charging electrodes (10), except for their front ends, are enclosed, said mounting means (20) having at least one support (24) running radially from said external housing (7) of said spraying head (2) and containing a high voltage conductor (12) connected electrically to said charging electrodes (10), and characterized by said mounting means being an annular ring (20) surrounding said external housing (7) of said spraying head (2) at a distance therefrom and made of an insulating material, said charging electrodes (10) being inserted into said annular ring (20), an electrical conductor (12) disposed within said annular ring (20) connecting said charging electrodes (10) annularly to each other and is connected to the high voltage cable conductor (14), said mounting means having an end face (21) including depressions (22) disposed on the front of said end face (21) at the point where said electrodes (10) are exposed, said conductor (12) being electrically insulated from the end face (21), facing the object to be coated of the annular ring (20), whereby the distance between said charging electrodes (10) are such that, while the unit is in operation, there is no substantial deposit of coating material upon the end face (21) of said annular ring (20)
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Semiconductor manufacture 
