Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1976-02-05
1978-04-11
Smith, Ronald N.
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
118627, 118638, 118DIG5, 361226, 427 21, 427 27, B05D 106, B05B 502
Patent
active
040840190
ABSTRACT:
A power grid for a fluidized bed for electrostatically depositing a powdered plastic coating material from the bed onto an elongated metal substrate moving in a path of travel above the upper surface of the bed on a substantially horizontal pass line. The power grid includes two co-planar wire mesh elements positioned beneath the surface of the bed, the elements having opposed edges in parallel spaced relationship and defining a gap therebetween beneath the pass line. The edges are upturned to form a plurality of electrode segments, the tips of the electrode segments being substantially coincident with the upper surface of the bed when energized. In operation the electrode segments form a row of localized corona discharges to either side of the passing substrate to effect electrostatic deposition of a thin uniform film coating of the powdered material thereon.
REFERENCES:
patent: 2421787 (1947-06-01), Helmuth
patent: 2503224 (1950-04-01), Trump et al.
patent: 2625590 (1953-01-01), Peeps
patent: 2758535 (1956-08-01), Roberts
patent: 2889805 (1959-06-01), Freeder
patent: 3248253 (1966-04-01), Barford et al.
patent: 3336903 (1967-08-01), Point
patent: 3566833 (1971-03-01), Beebe et al.
patent: 3672927 (1972-06-01), Spiller et al.
Christ Christy
Graff Hart F.
Armco Steel Corporation
Frenkel Stuart D.
Smith Ronald N.
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