Title: Electrostatic coating grid and method

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.

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Inventors: Christ, Christy (Trenton, OH, US)
Graff, Hart F. (Middletown, OH, US)

Application Number: 655460
Filing Date: 1976-02-05
Publication_date: 1978-04-11
Assignee: ARMCO Steel Corporation (Middletown, OH)
Primary Class(es): 427/460 118/627, 118/638, 118/DIG5, 361/226, 427/477
Other Classes:
US Patent Ref:

2421787	Jun, 1947	Helmuth	427/32.
2503224	Apr, 1950	Trump et al.	317/262.
2625590	Jan, 1953	Peeps	118/627.
2758535	Aug, 1956	Roberts	118/627.
2889805	Jun, 1959	Freeder	118/627.
3248253	Apr, 1966	Barford et al.	427/33.
3336903	Aug, 1967	Point	118/624.
3566833	Mar, 1971	Beebe et al.	118/634.
3672927	Jun, 1972	Spiller et al.	427/32.

Other Refs:
Primary Examiner: Smith, Ronald N.
Assistant Examiner: Frenkel, Stuart D.
Attorney: Melville, Strasser, Foster & Hoffman