Abstract: A process for forming a multilayer coating. The process enables coating of multiple layers by a continuous process in which mixing and diffusion between the layers is prevented. The process is particularly useful for producing, e.g., electrophotographic photoreceptors or photosensitive printing plate precursors comprising two or more coating layers.

Abstract: An apparatus and method including a droplet coating generator for generating a stream of electrically charged coating droplets within an evacuable chamber towards a substrate positioned within the evacuable chamber. A piezoelectric vibrator and orifice plate coupled thereto generate the stream of coating droplets. The coating droplets are urged to move in a sweeping motion across the substrate by at least one pair of opposing spaced apart electrodes powered by an electrical power supply. A uniform coating is thus produced while the evacuable chamber is maintained at subatmospheric pressure as required during typical semiconductor processing. Multiple applications of a photoresist coating may be applied by the coating apparatus without requiring that the evacuable chamber be repeatedly vented and pumped down to subatmospheric pressure.

Abstract: Disclosed herein is a method of paint application. This method has the following advantageous effects. More specifically, when different paint is used, desired paint is alternately supplied to a first paint feeder and a second paint feeder from a paint feed source thereby to enable efficient painting of a workpiece by a spray gun. On the other hand, when the same paint is used, the paint is supplied only to the first paint feeder without using the second paint feeder, thereby making it possible to reduce wastefully-discharged paint and to efficiently carry out any cleaning work.

Abstract: A spray painting booth for electrostatically painting objects includes encapsulated electrically charged panels which are adapted to repel electrically charged paint particles that are produced by an electrostatic spray painting device. The electrostatic spray painting device is charged to a potential of 60,000 to 135,000 volts DC negative with respect to ground so that the resulting spray of paint particles is negatively charged. An object or article to be painted is disposed in the booth by a conveyor mechanism and is maintained at ground potential. The encapsulated, electrically charged panels or walls of the booth are charged to a potential of 30,000 volts DC negative with respect to ground by a power supply such that the panels are charged to a potential between the negative DC potential with respect to ground to which the spray paint device is charged and the ground potential of the article to be painted.

Abstract: A method and apparatus for electrostatically spraying conductive coating material onto objects, primarily large extended objects, by charging with a relatively large charge the space behind the surface to be coated. With hollow objects, such as automobile bodies, the space within the body is charged. The space is charged by spraying an electrostatically charged atomized water mist into the space which evaporates charging the space and object surface. An electrostatic field is produced between the surface and the gun which, along with the supply of conductive material to which it is connected, is grounded. The gun discharges a film of coating which is atomized into droplets. The field inductively charges the film fringe and thus the droplets which are then attracted onto the large charged surface.