Importance

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Abstract

Spraying unit for spray coating articles with powdered or liquid material contains a spray head fastened to a front end of a tubular inner and axially extending support and an outer protective tube disposed concentrically about the inner support. The inner support and the outer protective tube are electrically insulative. One or more high-voltage generators are spacedly disposed about the inner support, axially rearward of the spray head, and within an elevated pressure chamber defined between the protective tube and the inner support. The arrangement is such that it produces a constant outwardly bound flow of gas from the elevated pressure chamber which flow prevents soilage of the internal parts by coating material. Structurally, the spraying unit is compact and slim and its parts are so interconnected that electrically conductive coating material cannot form conductive bridges that may bridge the high voltage at the electrostatically charging spray head or the high-voltage generators to ground or other lower potential regions.

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First Claim