Coating processes – Solid particles or fibers applied – Fluidized bed utilized
Patent
1983-05-25
1984-08-21
Beck, Shrive P.
Coating processes
Solid particles or fibers applied
Fluidized bed utilized
427 97, 118421, 118429, B05D 122, B05C 1902
Patent
active
044669895
ABSTRACT:
Articles such as printed wiring board substrates (10) often having hundreds of tiny through-bores are coated with particles (76) in fluidization apparatus (55). Such apparatus (55) includes a base (56) having a frame (61) to receive reciprocation forces applied to an arm (65) and to transmit the same to a fluid bed assembly (68). Assembly (68) includes a plenum (71) for distributing gas, a holder (75) for a bed of particles made fluid-like by gas diffusing therethrough and columns (69) for supporting a work chamber (85). Connected to the bed assembly (68) is the chamber (85) having sidewalls (86-89) formed sufficiently strong to uniformly distribute horizontal vibratory forces thereover. Vibrators (91 and 92) are mounted to opposing sidewalls (88 and 89), respectively, to apply horizontal forces against such sidewalls and gases therebetween. Sidewalls (86-89) are advantageously isolated from assembly (68) sufficiently that the horizontal forces are substantially contained in and uniformly distributed over sidewalls (88 and 89) and gases therebetween. Horizontal mobility is thereby imparted to the gas-borne particles (76) to a degree dependent upon optional adjustment of the vibrators (91 and 92).
REFERENCES:
patent: 3196033 (1965-07-01), Brooks
patent: 3254625 (1966-06-01), Armstrong
patent: 3520711 (1970-07-01), Bish et al.
patent: 3593678 (1971-07-01), Miller
patent: 4224090 (1980-09-01), Garner
Haller Albert H.
Schutz Eckart F.
AT&T - Technologies, Inc.
Beck Shrive P.
Watson D. C.
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