Fluid sprinkling – spraying – and diffusing – Processes – Including electrostatic charging
Patent
1998-10-02
2000-04-04
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Processes
Including electrostatic charging
239700, 239704, 239708, 239436, 239696, B05B 500
Patent
active
060450533
ABSTRACT:
Apparatus for powder spray coating comprises means for electrostatically-charging powder entrained in air, a conduit for transporting the electrostatically charged powder from the charging means to a spray head adapted to discharge the powder in a hollow conical spray pattern, wherein the spray head comprises means for diverting at least a portion of the flow of charged powder towards a spray device mounted to the spray head and adapted to discharge powder in a substantially uniform conical spray pattern, the spray head, spray device and the hollow conical and conical spray patterns being substantially symmetrical about a common longitudinal axis. The apparatus is particularly suitable for coating a large surface area. Preferably multiple tribo-electric charging means are used and a pump is used to supply powder to the multiple charging means through a common distributor. After passing through the multiple charging means the powder flows are then recombined and sprayed through a common spray apparatus. The apparatus may include multiple powder sources and means to change rapidly the powder being sprayed from one powder source to another.
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Evans Robin O.
Kashnikow Andres
Nordson Corporation
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