Electrospray coating process and apparatus.

摘要

An electrostatic coating system for applying very thin coating to a substrate in air at atmospheric pressure comprises a plurality of spaced capillary needles (11) positioned in at least two rows and fed with coating liquid via a reservoir (15). The needles (11) are disposed concentric within holes (13) in an extractor plate (14), a potential is developed between the capillary needles (11) and the extractor plate (14) affording a reduction of the liquid to a mist of highly charged droplets drawn to the substrate by a second electrical field. Insulative layers (64, 66) on the extractor plate provide increased droplet control.