| 摘要 |
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 DEG F.
|
