Spray apparatus for applying a sharp-edged pattern of coating

Abstract

A spray apparatus is disclosed which is capable of producing a sharp-edged layer of coating in overlap over the surfaces coated in a different color so as to provide a distinctly divided two-tone pattern of wide dimensions without using masking tape. The spray apparatus comprises a first spray means and at least one second spray means different in nozzle design from the first spray means. In the first spray means, a film of coating is produced by an airless type paint discharge nozzle discharging a spray of atomized paint under pressure in an otherwise conical shape which is to be altered in spray formation by a jet of pressurized air whose axis is offset from the axis of the spray of paint and this film is thick enough along one edge and in the center while decreasing in coating toward the opposite edge. In the second spray means, the spray of atomized paint is shaped into a symmetrical cone by a controlled jet of pressurized air, with the resultant film of coating being thick enough in the center and decreasing in thickness toward both edges. The first and second spray means are spaced apart from operation such that the entire coated area will come as a layer of uniform coating, with the opposing edges of the films overlapping to provide a coating as thick as in their center portions.