Importance

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Abstract

A system for coupling a grounded color changer to an electrostatic coating material sprayer electrically isolates the color changer from a high voltage at the sprayer. The system has a fluid path extending from the color changer to the sprayer and a reservoir is coupled to the fluid path at a connection point intermediate the color changer and sprayer. To fill the system with coating material to be sprayed, the fluid path to the sprayer is first filled with coating material from the color changer, following which the remaining coating material to be sprayed during the coating operation is flowed from the connection point into the reservoir. At least a portion of the fluid path between the connection point and the color changer is then cleaned of coating material to electrically isolate the reservoir and the sprayer from the color changer. Coating material is then delivered from the reservoir to the sprayer for being subjected to a high voltage and emitted in an electrostatically charged atomized spray. At the end of spraying, the high voltage is removed from the sprayer, and the reservoir, fluid path and sprayer are cleaned of coating material of the color just sprayed and reloaded with the next color of coating material to be sprayed.

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First Claim