Powder coating the interior of pipe

Details Powder coating the interior of pipe Powder coating the interior of pipe

1981-02-23

1983-12-13

Beck, Shrive P.

Coating processes

Solid particles or fibers applied

Interior or hollow article coating

427181, 118308, 118DIG10, 222 80, 222 82, 222325, B05D 106, B05D 722

Patent

active

044205082

ABSTRACT:
Method and apparatus by which the interior of a pipe is coated with a uniform thickness of plastic. A source of heat-meltable plastic material in particular form is connected at a location upstream of the inlet end of the pipe, while the opposed end of the pipe is made attachable to a reduced pressure. A source of compressible fluid is also connected at a location upstream of the inlet end of the pipe. The pipe is preheated and then rotated axially while a charge of powdered plastic is forced through the pipe by the compressible fluid. The powdered plastic which flows through the pipe is a finite pocket of the finely divided plastic, which is smaller in volume respective to the volume of the pipe being coated.

REFERENCES:
patent: 3199923 (1965-08-01), Brooks
patent: 3207618 (1965-09-01), De Hart
patent: 3814616 (1974-06-01), Kondo et al.
patent: 3974939 (1976-08-01), Melton et al.
patent: 4089998 (1978-05-01), Gibson
patent: 4165022 (1979-08-01), Bentley et al.
patent: 4243699 (1981-01-01), Gibson
patent: 4256241 (1981-03-01), Mesic

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