Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1987-03-31
1988-08-02
Beck, Shrive P.
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
118629, 118630, 118631, B05D 104
Patent
active
047612991
ABSTRACT:
Method and apparatus are provided for electrostatically spray coating an article in a coating zone with a liquid coating material, such as paint, wherein air is supplied to the spray head of an air spray gun at an atomizing air flow rate in excess of 5 CFM and at a delivery pressure of less than 15 psi to atomize the liquid coating material. At this combination of relatively low pressure and relatively high volume of air the transfer efficiency is substantially higher than for conventional air spray guns. A turbine unit filters and heats the air so that the air has a temperature in excess of 70.degree. F. at the spray head. An elongated conductive rod is reciprocably supported within a nozzle of the spray head to create an electrical charge differential between the atomized liquid coating material and the article in the coating zone when charged by a high voltage source. Preferably, the rod is positioned within a liquid discharge orifice of the nozzle to alternatively open and close the nozzle. Also, preferably, the air flow rate at the spray head is in the range of 5-35 CFM, and the air delivery pressure at the spray head is in the range of three to nine psi over atmospheric pressure.
REFERENCES:
patent: 2302185 (1942-11-01), Campbell
patent: 2766064 (1956-10-01), Schweitzer
patent: 3382091 (1968-05-01), Drum
patent: 3463121 (1969-08-01), Walberg
patent: 4077354 (1978-03-01), Walberg
patent: 4313968 (1982-02-01), Sickles et al.
Hufstetler Patrick A.
Hynds James E.
Beck Shrive P.
Hynds James E.
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