Electrostatic powder deposition

摘要

Powder to be deposited electrostatically by spraying from a nozzle is charged tribo-electrically. The powder is admitted at a controlled rate to a housing through which an air stream is caused to flow and becomes charged by frictional impact with the surface of a rotor which intercepts the air stream. Charged powder suspended in the air stream passes through a conduit to the nozzle at which a baffle is located to cause the powder to be sprayed in a predetermined distribution.