Method of powder coating the inside of pipes with a continuous f

Details Method of powder coating the inside of pipes with a continuous f Method of powder coating the inside of pipes with a continuous f

1985-10-11

1989-03-28

Beck, Shrive

Coating processes

Solid particles or fibers applied

Interior or hollow article coating

427233, 427234, 118312, 118DIG10, 118308, B05D 112, B05D 722

Patent

active

048162973

ABSTRACT:
A method of powder coating the inside of tubular goods, such as oilfield pipe and the like, by connecting one end of the pipe to a means for producing a flow of compressible gases therethrough. The other end of the pipe is open to atmospheric pressure. A valve means is connected for controlling the flow of air through the container which holds a single charge of plastic powder. The charge of powdered plastic is isolated upstream of the pipe inlet. The charge is of sufficient size to coat the entire inside peripheral wall surface of the pipe with a substantial uniform coating of plastic. The pipe is heated above the softening temperature of the plastic and axially rotated, so that when the valve is opened, air flows through the container, into the pipe, and establishes a pressure gradient across the entire length of the pipe. This action causes the captured charge of plastic to form a pocket of dispersed plastic particles which is forced to flow through the pipe by the air flow. The plastic particles are deposited and fused to the hot rotating inner surface of the pipe.

REFERENCES:
patent: 3207618 (1965-09-01), DeHart
patent: 3974306 (1976-08-01), Inamura
patent: 3982050 (1976-09-01), Kato et al.
patent: 4089998 (1978-05-01), Gibson

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