Method and apparatus for simultaneously electrocoating the inter

Details Method and apparatus for simultaneously electrocoating the inter Method and apparatus for simultaneously electrocoating the inter

1981-06-05

1983-08-23

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204181C, 204299EC, 204300EC, C25D 1304, C25D 1314

Patent

active

044002513

ABSTRACT:
A method and apparatus are provided for electrocoating the interior and exterior of a metal container using a dual flow system. The interior and exterior surfaces of the metal container may be coated with the same or different coating weights. An electrically conductive probe, including a nozzle, is inserted into a metal container and an electrically conductive housing is enclosed around the container to seal the container therein. Two separate passageways are provided such that one passageway supplies coating material about the container between the container exterior and the outer housing and a second passageway is formed by the hollow probe and the interior of the container. Electrocoating material is caused to flow into each of the passageways. As flowing electrocoating material floods the container interior and exterior in separate transient baths, an electrical potential is impressed between the container and the probe-nozzle to electrocoat the interior of the container, and between the container and the outer housing to electrocoat the exterior of the container. The interior and exterior of the container can be coated simultaneously.

REFERENCES:
patent: 3922213 (1975-11-01), Smith et al.
patent: 4094760 (1978-06-01), Smith et al.
patent: 4210507 (1980-07-01), Davidson et al.
patent: 4246088 (1981-01-01), Murphy et al.

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