| 摘要 |
An apparatus for applying powder coating material to a substrate is disclosed. The apparatus comprises: (A) an electrostatic spray gun for dispensing a mixture of electrostatically charged powder coating particles and a gas (e.g., air) inert to said particles; (B) a shroud which is attached to said gun; (C) a mixing chamber disposed in the rearward section of said shroud and into which said gun dispenses said mixture; (D) a forward section of said shroud having an opening adapted to be disposed in a position relative to the substrate such that powder coating particles issuing from the opening are attracted to said substrate; (E) at least two slotted openings formed by pairs of baffle plates connecting the mixing chamber with the forward section such that the pressurized mixture from said mixing chamber may pass through said slotted openings, into said forward section and through the opening therein toward the substrate to be coated; (F) field electrodes in electrical connection with said gun and being disposed in the vicinity of said slotted openings so as to create an electrostatic field in the vicinity of the opening of said forward section; and (G) a vacuum intake port disposed in the vicinity of the opening of said forward section between the slotted openings and being adapted such that eddies of said pressurized mixture flowing from the slotted openings in the direction of said port are created and such that said powder not attracted to said substrate is collected at said port.
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