Fluid sprinkling – spraying – and diffusing – Processes – Including electrostatic charging
Patent
1974-10-24
1976-06-01
Ward, Jr., Robert S.
Fluid sprinkling, spraying, and diffusing
Processes
Including electrostatic charging
239 15, B05B 502
Patent
active
039603237
ABSTRACT:
A coating apparatus with a powder supply system for use in a device for electrostatically spraying powder material onto the surface of an article or substrate to be coated. The system includes a powder reclaiming and recycling system which pneumatically retrieves the unused powder from the spray booths and filters the powder from the air. The filter system includes plural modules, each capable of accommodating a given number of spray guns. An automatic filter shaking system releases the powder from the filters upon command by sequentially shutting down the filter modules, one at a time, while the system is in operation. An additional filter module is provided so that adequate filtering capability is maintained while the filter shaking operation proceeds. The powder released from the filters is blown from the filters to a feeder section through a sieve which mixes new powder with the reclaimed powder under automatic control which replenishes the powder supply to the feeder. The feeder employs a fluidizing bed from which (a plurality of) plural module feeders are fed. The feeders are positioned beneath the bed and draw powder through elongated standpipes for improved powder flow control. This configuration shows complete drainage of the bed and prevents "puffing" associated with conventional fluidized bed feeders. The feeders are quickly and easily detachable from the system and can be quickly and easily replaced or disassembled for cleaning when material or color change is desired.
REFERENCES:
patent: 2659841 (1953-11-01), Hampe
patent: 3269446 (1966-08-01), Luther
patent: 3351285 (1967-11-01), Tholome
patent: 3471089 (1969-10-01), Kock
patent: 3473735 (1969-10-01), Drum
patent: 3680779 (1972-08-01), Reilly
patent: 3843054 (1974-10-01), Kendall et al.
Ducan Lane S.
Riedy Charles H.
Tamny Simon Z.
Nordson Corporation
Ward, Jr. Robert S.
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