Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Reexamination Certificate
1999-08-20
2001-02-20
Parker, Fred J. (Department: 1762)
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
C428S168000, C428S172000, C123S090380
Reexamination Certificate
active
06190745
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field
This invention relates to the field of powder coating selected portions of a substrate, and more particularly concerns powder coating cast aluminum valve covers for diesel engines without the necessity of masking the non-selected portions of the valve covers to prevent overspray.
2. Background of the Prior Art
Conventionally, cast aluminum valve covers are either spray painted or powder coated so that the entire cover is coated including the raised lettering or designs. Then the raised portion is sanded back to the bare aluminum to provide a contrast between the lettering and the colored background of the cover.
BRIEF SUMMARY OF THE INVENTION
The present invention is designed to overcome the problems of the prior art, and to provide a process for color coating the raised lettering of aluminum valve covers, and other substrates, but not require the laborious masking of the non-selected portions of the valve covers in order to prevent overspray.
The present invention provides a process for powder coating selected portions of a substrate, such as cast aluminum valve covers, and comprises the steps of electrostatically applying a controlled thickness of a powder to the surface of a transfer member to form a powdered coating thereon, heating a substrate to a temperature above the gel point of the powder (the gel point is the temperature at which the powder turns into a gel), pressing the heated substrate against the powder coating of the transfer member, melting the powder coating on the transfer member and causing the melted powder to stick to the substrate and coat selected portions of the substrate, and polymerizing and curing the coated portions of the substrate to fix the powder coating to the substrate.
The controlled thickness of powder is preferably a uniform thickness of approximately 4-6 mils (0.04-0.006 inches) with a uniformity of + or − 1 mil.
REFERENCES:
patent: 3765330 (1973-10-01), Gundlach
patent: 4304179 (1981-12-01), Katou et al.
patent: 4328275 (1982-05-01), Vargo
patent: 5246757 (1993-09-01), Condon et al.
Earley John F. A.
Earley III John F. A.
Harding Earley Follmer & Frailey
Parker Fred J.
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