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Electrostatic-fluidized bed coating of wire

  • US 4,188,413 A
  • Filed: 01/20/1978
  • Issued: 02/12/1980
  • Est. Priority Date: 10/18/1976
  • Status: Expired due to Term
First Claim
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1. A process for continuously applying a controlled thickness coating on an elongate electrical conductor, comprising the steps of(a) providing an upwardly extending hollow member having an upwardly facing port,(b) providing a bed of powder about said hollow member,(c) fluidizing said bed to an extent such that the upper surface of the bed is below the port,(d) electrically charging the fluidized bed with an electrical potential different from the electrical potential of the conductor by electrically charging electrode means disposed within said bed,(e) said conductor being a rectangular wire having an elongate cross-sectional shape including opposite narrow ends interconnected by a pair of elongate opposite sides,(f) disposing said electrode means in a angularly spaced apart, generally horizontal array with at least one charged electrode porjecting radially inwardly toward each elongate cross-section side of the rectangular wire and no electrode projecting inwardly toward either of said cross-sectional narrow sides,(g) advancing the conductor along a path through said hollow member and upwardly out of said port to effect coating of the powder onto the conductor,(h) adjusting the height of the port above the upper surface of the bed to control the thickness of the powder coating.

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