Apparatus method and valve for electrodepositing a coating on interior surfaces of container bodies

Abstract

Abstract An electrocoating system comprises an apparatus, method and valve for electrodepositing a coating on interior electricallyconductive surface areas of container bodies. Container bodies having an open end are timely fed onto circumferentially aligned rows of valves on the exterior of a rotating cylindrical drum containing an electrolytic fluid. Continuous anodic cables extend around the drum, exert axial pressure on the bottoms of the containers, render them anodic, sealingly engage their rims on the valves and thereby open the valves to gravity-feed the fluid into the bodies. With fluid therein, current passed through cathodic electrodes projecting from the valve exteriors into the bodies, electrodeposits a coating on the electrically-conductive surface areas of the container bodies. During continued drum rotation, fluid gravitydrains from the coated bodies back into the drum, and the empty, coated bodies are discharged from the system. The fluid valve has a fixed exterior and a moveable interior housing. A valve member connected to the exterior housing has an insulated conductive core to which a spring electrode is connected thereto exterior of the valve member. The interior housing is axially moveable against a spring bias to open a passageway in the valve. All parts of the valve are nonconductive in relation to the fluid.

Inventors

• 👤 H Kossmann

Bibliographic Details