Pulsed power application system
AssigneeThe Continental Group, Inc.
InventorsPeter N. Y. Pan, Rafael J. Hernandez
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Abstract
A pulsed powder application system for electrostatically powder-coating a substrate comprises an applicator bed means, a fluidizing means, and a pulsing means. The pulsing means is actuable during a coating time to effect ionization of electrostatic powder particles so as to cause the establishment of an electric field attracting the particles to the substrate, and actuable during non-coating times to cause the establishment of a reverse electric field attracting the ionized particles away from the substrate. A feeder bed means and an associated fluidizing means are provided for holding the electrostatic powder prior to usage for coating by the applicator bed means.
Claims15
A method of electrostatically powder-coating a substrate occupying a coating position adjacent thereto, comprising the steps of:
- a. providing electrostatic powder particles in the vicinity of said coating position;
- b. fluidizing said electrostatic powder to endow it with fluid-like characteristics;
- c. pulsing said fluidized electrostatic powder by a high voltage pulse connected across a pair of electrodes disposed in the bed of the fluidized powder for a predetermined coating time so as to effect ionization of said electrostatic powder particles whereby to cause the establishment of an electric field attracting said electrostatic powder particles to said substrate;
- and
- d. subsequently applying to said pair of electrodes a reverse electrical field attracting the excess of said ionized electrostatic powder particles away from said substrate.
Dependencies are inferred from the claim text.