POWUER COATING APPARATUS U.S. Patent 6,068,702.
May 30, 2000 C. Bertellotti et al., assignors to Nordson Corp., Westlake, Ohio
A powder coating apparatus capable of converting between at least two different powder coating systems, the apparatus comprising an operating hood having sides generally surrounding a powder coating area, with at least one side having an opening to allow the introduction of a part to be coated within the powder coating area; an air circulation system connected to the operating hood for drawing air from the powder coating area as the part is coated with powder; and an adjustable air flow regulator operatively connected with the air circulation system for controlling the draw of
air and powder out of the powder coating area between a first draw amount and a second, higher draw amount, wherein the first draw amount allows use of the hood as one powder coating systems and the second, higher draw amount allows use of the hood as another powder coating system. ELECTROSTATIC
U.S. Patent 6,068,877.
May 30, 2000 K. Seitz et al., assignors to Wagner International AG, Alstatten, Switzerland
A method of detecting and coating workpieces in an electrostatic coating system comprising applying a high voltage to an electrode of at least one electrostatic coating device, in which a spray current containing electrical charges
for charging particles of a coating material to be sprayed is generated by the electrode; passing an electrically conductive workpiece to be coated by the at least one coating device; determining the spray current of the high voltage electrode; detecting whether the workpiece is in front of the at least one coating device depending on the magnitude of the determined spray current; starting a discharge of the coating material by the at least one coating device when the spray current exceeds a first threshold value of spray current; and stopping the discharge of coating material by the at least one coating device when the spray current falls below a second threshold value of spray current.
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