Spray device and method for powder coating material
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United States of America Patent
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Nov 11, 1997
Grant Date -
N/A
app pub date -
Jan 4, 1996
filing date -
Jan 27, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A spray device and method for the coating of objects with powder coating material. A high voltage electrode or several electrodes are located on only one side of the coating material stream in the vicinity of a spray orifice for electrostatically charging the coating material. A first flow of compressed air is directed over the electrodes to keep the coating material from accumulating on the electrode and to shape the envelope of the sprayed coating material. A second stream of compressed air is directed at the stream of coating material to counteract the deflection of the stream by the first flow and by the effects of the high voltage. Better coating efficiency (reduced loss of sprayed powder) is achieved than with electrodes arranged on both sides of the coating material stream.
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