Importance

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Abstract

A system for electrostatic application of conductive coating liquid has a grounded primary supply of conductive coating liquid, an electrostatic spray device and a system for delivering coating liquid from the primary supply to the spray device while maintaining a high voltage at the spray device electrically isolated from the primary supply. The delivery system includes one or more electrical insulation devices, each of which has a cylinder comprising an insulative conduit having a liquid inlet and a liquid outlet. The cylinders of the electrical insulation devices are connected via their inlets and outlets between the primary supply and the spray device to deliver coating liquid from the primary supply to the spray device. Each electrical insulation device has within its cylinder a piston that is movable between the inlet to and the outlet from the cylinder to move coating liquid out of the cylinder while scraping the inside wall of the cylinder free of coating liquid, so that the cylinder becomes substantially electrically insulating between its inlet and outlet.

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First Claim