Coating apparatus – With vacuum or fluid pressure chamber
Patent
1978-07-31
1981-02-10
McIntosh, John P.
Coating apparatus
With vacuum or fluid pressure chamber
118108, 118415, B05C 504, B05C 1104
Patent
active
042494770
ABSTRACT:
A device for applying mastic material to the weld bead area of longitudinally welded pipe is the subject of this application. An extruder is mounted on a framework and receives mastic material in rope form from a bulk spool positioned above the extruder. The extruder incorporates heating elements to raise the temperature of the mastic. The extruder is provided with dual orifices for depositing a layer of the mastic material on either side of the weld bead of the pipe. A doctor blade is mounted to move along the pipe extending from the weld bead to a point on the pipe surface to smooth the mastic material which has been deposited. The doctor blade smooths the material evenly and causes it to form a bridge between the apex of the weld bead and a point on the pipe surface adjacent the base of the weld bead.
REFERENCES:
patent: 2014378 (1935-09-01), Gardiner et al.
patent: 2340325 (1944-02-01), Horrigan
patent: 2903739 (1959-09-01), Hann
patent: 2982992 (1961-05-01), Brown et al.
patent: 3271800 (1966-09-01), Allard
Christie Howard W.
Hodge Walter D.
H. C. Price Co.
McIntosh John P.
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