Coating processes – Solid particles or fibers applied – Interior or hollow article coating
Patent
1977-11-30
1979-08-07
Beck, Shrive P.
Coating processes
Solid particles or fibers applied
Interior or hollow article coating
427 28, 427181, 427195, 427233, 427234, 427239, B05D 722
Patent
active
041638123
ABSTRACT:
A method for coating a slender, cylindrical container with a thin, resinous coating by spraying powdered resin is disclosed. The technique involves spraying of finely divided resin particles entrained in a gas stream at a substantially uniform rate at a velocity of from about 20 ft/min. to about 1000 ft/min. from a nozzle. The container may be sprayed by directing a continuous flow of resin particles at an accurate, predetermined rate into the container to deposit a substantially uniformly distributed coating. Alternatively, a pulse of a predetermined quantum of resin may be sprayed into a container. The resin particles are caused to adhere to the container by preheating the container, by inducing an electrostatic charge on the resin particles, or a combination of both. The coating may be matured by preheating the container to a high temperature or by postheating the coated container at temperatures in excess of about 300.degree. F.
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Beck Shrive P.
W. R. Grace & Co.
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