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Method and apparatus for electrostatic coating of articles with powdered coating material

  • US 4,706,890 A
  • Filed: 04/15/1986
  • Issued: 11/17/1987
  • Est. Priority Date: 04/22/1985
  • Status: Expired due to Fees
First Claim
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1. An apparatus for electrostatic spraying of coating material on articles, the apparatus comprising:

  • a feed channel having a first end through which the coating material is introduced into the feed channel and a second end through which the coating material emerges, the feed channel having at least one charging surface therein made of electrically insulated material suitable for electrically charging the coating material by friction;

    at least one discharge electrode disposed at a location outside of the feed channel, the at least one discharge electrode including means for connection thereof to a predetermined electrical potential;

    a gas channel extending between the at least one discharge electrode and the feed channel, the gas channel being suitable for enabling an electrically conductive gas to flow and contact both the at least one discharge electrode and the at least one charging surface in the feed channel, whereby the gas is effective for preventing coating material from reaching the at least one discharge electrode and also for providing an electrically conductive path through which electrical charges collected on the at least one charging surfaces are conducted to the at least one discharge electrode.

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