Coating apparatus – With vacuum or fluid pressure chamber
Patent
1973-11-20
1976-07-20
McIntosh, John P.
Coating apparatus
With vacuum or fluid pressure chamber
118312, 118323, 118603, 118634, 425 92, 425223, 425224, B05C 500
Patent
active
039700356
ABSTRACT:
Apparatus and method for electrostatically depositing a layer of particulate material on a substrate surface from a gaseous suspension of particulate, thermoplastic material. Classifying means removes oversized particles from a supply of particulate, thermoplastic material and feeds properly-sized particulate material to a metering feed device. A pressure responsive sensing means is associated with the metering feed device, and energizes a control circuit associated with the classifying means to direct properly-sized particulate material from the classifying means into the metering feed device to maintain a substantially constant, predetermined amount of properly-sized particulate material in the metering feed device. The metering feed device feeds the properly-sized particulate material at a controlled volumetric rate into a gaseous medium to form a gaseous suspension of properly-sized particulate, thermoplastic material which is directed through a plurality of electrically charged spray means onto a substrate surface. The metering feed device includes a housing having a hopper section for receiving particulate material from the classifying means, and an elongate trough section in communication with the hopper section through a gate means. The trough section is divided into separate elongate channels by elongate, transversely spaced partition means which extend for substantially the entire elongate extent of the trough section. Each spray means includes a spray nozzle having an elongate passage terminating at a downstream end in an exit orifice, and a deflector fan positioned downstream of, and in overlying relationship with the exit orifice. Each spray nozzle has an inlet port in a side wall, and an elongate, tapered baffle overlies the inlet port for mixing a gaseous suspension of particulate material entering the spray nozzles through a conduit which is in communication with the inlet port of the spray nozzle and one channel of the metering feed device. Each spray nozzle further includes a discharge outlet chamber downstream of the baffle to confine the flow pattern of the gaseous suspension of particulate material as the gaseous suspension travels through the discharge outlet chamber and out of the exit orifice. The deflector fan associated with each spray nozzle deflects the gaseous suspension of particulate material onto the substrate surface in an elliptical pattern having its major axis disposed substantially transverse to the direction of elongation of the elongate passage. The spray nozzles are mounted on a belt which is movable along a path defining a closed loop having spaced, linear runs which traverse past the substrate surface upon which a layer of particulate material is to be formed. The metering feed device is supported on a rotatable platform, and drive means rotates the belt supporting the metering feed device at a synchronized speed to prevent twisting of delivery conduits which are in communication with the metering feed device and the spray nozzles.
REFERENCES:
patent: 2003778 (1935-06-01), Willis
patent: 2770212 (1956-11-01), Marantz
patent: 3073070 (1963-01-01), Mead
patent: 3139044 (1964-06-01), Cole
patent: 3149650 (1964-09-01), Horst
patent: 3362109 (1968-01-01), Wallace
patent: 3724416 (1973-04-01), Diamond et al.
McIntosh John P.
Vitek Research Corporation
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