| US 7,481,884 B2 | ||
| Powder coating apparatus and method of powder coating using an electromagnetic brush | ||
| Eric C. Stelter, Pittsford, N.Y. (US); Patrick M. Lambert, Rochester, N.Y. (US); Joseph E. Guth, Holley, N.Y. (US); Laverne N. Lincoln, Jr., Macedon, N.Y. (US); Michael W. Frauens, Webster, N.Y. (US); and Kenneth P. Friedrich, Honeoye, N.J. (US) | ||
| Assigned to Eastman Kodak Company, Rochester, N.Y. (US) | ||
| Filed on Mar. 09, 2005, as Appl. No. 11/75,784. | ||
| Claims priority of provisional application 60/551464, filed on Mar. 09, 2004. | ||
| Prior Publication US 2005/0202164 A1, Sep. 15, 2005 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. B05C 1/08 (2006.01) | ||
| U.S. Cl. 118—247 [118/248; 118/249] | 18 Claims |
| 1. An apparatus for applying powder coatings to a substrate comprising:
a reservoir of charged powder particles in the presence of hard carrier particles as a supply of powder coating material;
and
a magnetic brush having a rotatable shell coated with an insulative coating having more than a dielectric strength of 2100
vpm (volts per mil) surrounding a rotatable magnetic core, the a rotatable shell biased with a DC voltage greater then 1000
volts such that the maximum bias voltage for deposition is determined by the voltage drop across the insulative coating wherein
that drop is a portion of a total drop from the shell to the receiver; and
an electric field, having an AC and DC component, between the magnetic brush and a movable receiver for applying the powder
coating material from the reservoir to the substrate.
|