Coating processes – Solid particles or fibers applied – Uniting particles to form continuous coating with...
Patent
1986-03-14
1987-06-02
Beck, Shrive P.
Coating processes
Solid particles or fibers applied
Uniting particles to form continuous coating with...
118307, 118308, 427425, 427286, 427318, B05D 112
Patent
active
046703012
ABSTRACT:
A method and apparatus for coating the helical weld seam extending around a spirally welded pipe is disclosed. Following the application of the usual coating as by a sintered polyethylene coating process, the heated pipe is subjected to a further flow of the coating material from a hopper on a movable coating apparatus. The outlet chute of the hopper is aligned with the pipe and an operator drives a movable carriage carrying the hopper on a rail system extending parallel to the longitudinal axis of the pipe. The speed of movement of the carriage on the track is coordinated with the speed of rotation of the pipe on its longitudinal axis and with the pitch of the weld seam so that the outlet chute of the coating apparatus remains aligned with the weld seam of the pipe. The operator is provided with a lever which controls the material outlet so that a proper flow of coating material can be maintained. If powdered polyethylene is the coating material, the heat of the pipe melts the applied powder over the weld seam to result in an increased increment of coating thickness at this region.
REFERENCES:
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patent: 2373638 (1945-04-01), Perkins
patent: 2977928 (1961-04-01), Knutsen et al.
patent: 3687706 (1972-08-01), Stanley et al.
patent: 4099481 (1978-07-01), Lyons
patent: 4276333 (1981-06-01), Cobean
patent: 4343436 (1982-08-01), Lehmann
Jaremco Gary J.
Thompson David G.
Beck Shrive P.
Bredero Price, Inc.
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