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Method and apparatus for powder spraying

  • US 5,839,669 A
  • Filed: 10/07/1996
  • Issued: 11/24/1998
  • Est. Priority Date: 10/05/1995
  • Status: Expired due to Term
First Claim
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1. A method for spraying a fluidized powder, which comprises:

  • a) introducing compressed air into a first chamber of a two-chamber fluidizing container, the container being closed except for a nozzle, an air inlet and an air outlet;

    b) introducing powder through a closable powder feed orifice into a second chamber;

    c) feeding the compressed air from the first chamber through a frit into the second chamber of the two-chamber fluidizing container forming a fluidized powder bed having a given air pressure;

    d) maintaining suitable pressure conditions of the given air pressure in the second chamber by regulating valves in the air inlet and outlet;

    e) extracting the fluidized powder from the vicinity of the fluidized bed and feeding the fluidized powder to the nozzle, controlling the extracting step by regulating the given air pressure; and

    f) electrically charging the fluidized powder emerging from the two-chamber container through the nozzle.

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