Coating processes – Roller applicator utilized
Patent
1981-02-23
1983-07-05
Beck, Shrive P.
Coating processes
Roller applicator utilized
427201, 118308, 118311, 239 61, 239325, 406 12, 406 14, 406 28, 406 29, 406118, 406137, 406144, B05D 108, B05B 714, B05B 720
Patent
active
043918603
ABSTRACT:
The invention contemplates a powder-feeding system for gas-propelled delivery of a powder to be controllably supplied, as to a flame-spraying gas torch or to a transferred-arc plasma torch. A fluidizing chamber receives (a) fluidizing-gas flow from below a porous screen, and (b) a restricted gravitational flow of powder at a relatively small central discharge location above the porous screen. A gas conduit extends transversely through the chamber between the powder-discharge location and the porous screen; it has a carrier-gas supply connection at one end and a gas-propelled powder-delivery connection at its other end. The conduit also has an upwardly extending opening virtually beneath and facing the powder-discharge location, but a shed interposed between this opening and the powder-discharge location sufficiently overlaps the opening to assure that no powder will pass through the opening and into the conduit unless it has been gas-fluidized. The powder-discharge flow is blocked to gas flow when powder is being delivered by the carrier-gas flow, but the powder delivery is terminated promptly upon gas-venting the fluidizing chamber, via the powder-discharge flow or otherwise.
A multiple-unit combination of such a system is also described wherein the proportion of different gas-fluidized powders may be selectively varied and/or coordinated to achieve various different application objectives, as in the course of a single run of a flame-spraying torch served by such combination.
REFERENCES:
patent: 2571608 (1951-10-01), Plagge
patent: 2817310 (1957-12-01), Ponzini
patent: 2919160 (1959-12-01), Blackburn
patent: 2998322 (1961-08-01), Strate
patent: 3020182 (1962-02-01), Daniels
patent: 3163329 (1964-12-01), Mornas
patent: 3220778 (1965-11-01), Aller
patent: 3365242 (1968-01-01), Marchett
Lyons John E.
Romero Eduardo
Rotolico Anthony J.
Beck Shrive P.
Eutectic Corporation
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