Method of powder coating the interior of tubular goods

Details Method of powder coating the interior of tubular goods Method of powder coating the interior of tubular goods

1976-07-13

1978-05-16

Smith, Ronald H.

Coating processes

Solid particles or fibers applied

Interior or hollow article coating

118317, 118318, 118DIG10, 427181, 427183, 427195, 427232, 427238, 427239, B05D 722, B05D 302

Patent

active

040899985

ABSTRACT:
The interior of a pipe is coated with a uniform thickness of plastic. A fluidized bed of heat-meltable plastic material in particular form is connected to the inlet end of the pipe, while the opposed end of the pipe is made attachable to a source of reduced pressure. A source of compressible fluid is also connected to the inlet end of the pipe. The pipe is preheated and then rotated axially while the compressible fluid flows therethrough. The compressible fluid flowing to the inlet is suddenly terminated while a flow from the fluidized bed is immediately established so that the vacuum at the outlet end of the pipe causes uninterrupted mass flow and pulls a finite pocket of the finely divided plastic into the pipe. The flow of particular plastic material is terminated, while the flow of compressed gas is immediately re-established, thereby pushing the pocket of plastic material into and through the pipe.

REFERENCES:
patent: 1716384 (1929-06-01), Pettee
patent: 1791624 (1931-02-01), Jessup
patent: 1997761 (1935-04-01), Bailey et al.
patent: 2758546 (1956-08-01), Gillette
patent: 2919160 (1959-12-01), Blackburn
patent: 3207618 (1965-09-01), De Hart
patent: 3208869 (1965-09-01), Starr et al.
patent: 3532531 (1970-10-01), Stallard
patent: 3946125 (1976-03-01), Scheiber
patent: 3974306 (1976-08-01), Inamura et al.
patent: 3982050 (1976-09-01), Kato et al.

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