Coating processes – Interior of hollow article coating – Removing excess coating material
Patent
1976-11-12
1978-02-14
Kaplan, Morris
Coating processes
Interior of hollow article coating
Removing excess coating material
118 56, 118 63, 118 73, 118426, 118603, 118DIG12, 214 1P, 427230, 427239, 427318, 427327, 427345, 427346, 427348, 427388C, 427435, B05D 118, B05D 138, B05D 312
Patent
active
040739783
ABSTRACT:
A method of and apparatus for the immersion treatment of discrete lengths of galvanized conduit to inhibit the formation of "white rust" on the conduit surfaces are disclosed. The conduit is continually conveyed successively through three treatment zones comprising a cleaning bath containing a cleaning agent which removes lubricating oils, greases, dirt and the like from the conduit interior and exterior surfaces, a rinse bath and a coating bath containing a coating agent including chromate ions and a polymeric coating composition. A rotary star wheel-type conveyor is arranged in each treatment zone for transporting the conduits in spaced, substantially parallel relation to each other about an arcuate path through each bath and for inclining the conduit above the bath for a time effective to drain excess liquid from the interior and exterior conduit surfaces. Effective draining of excess liquid prior to entry to another zone minimizes contamination of the various baths and yields a high quality product.
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patent: 3376152 (1968-04-01), Okamoto et al.
patent: 3563416 (1971-02-01), Dobrink
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patent: 3978816 (1976-09-01), Saloom
Headrick John C.
Martin Ronald R.
Starnes, Jr. Ralph E.
Womack William B. M.
Hanegan Herbert M.
Kaplan Morris
Linne Robert S.
Southwire Company
Tate Stanley L.
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