Coating apparatus – With vacuum or fluid pressure chamber
Patent
1977-03-16
1978-10-24
McIntosh, John P.
Coating apparatus
With vacuum or fluid pressure chamber
118 7, 118410, 118610, B05C 502, B05C 1110
Patent
active
041215354
ABSTRACT:
A method and apparatus for the handling of hot melt materials and the like for coating a web with the hot melt. Hot melt is fed from a source through a filter to a heated tank, and from the heated tank it is pumped to an extrusion head. Pumping of the hot melt from the tank to the extrusion head is accomplished solely by providing pressurized gas at slightly more than one atmosphere pressure over the hot melt in the tank. The source pressure of the hot melt is isolated from the supply pressure at the extrusion head, and the web to be coated is passed in operative relationship with the extrusion head. The hot melt is metered in a thin film flowing over heated surfaces in order to insure thermal uniformity without agitation. The level of hot melt in the tank is maintained at a predetermined level, and the extrusion head is provided at substantially the same predetermined level so that the extrusion will not overflow or drain when the pressurized gas from the tank is vented. The hot melt is fed into the tank and withdrawn from the tank in such a way that bubbles in the hot melt come to the surface and pop and/or form a foam on the top of the hot melt so that the withdrawn hot melt is substantially air free.
REFERENCES:
patent: 1929877 (1933-10-01), Bonamico
patent: 2357476 (1944-09-01), Kaulen
patent: 3282469 (1966-11-01), Skonberg
patent: 3522836 (1970-08-01), King
patent: 3793805 (1974-02-01), Hoffman
patent: 3938924 (1976-02-01), Abella et al.
patent: 4050411 (1977-09-01), Kimmich
Kesler George
Roberts, Jr. Arthur W.
Inta-Rota, Incorporated
McIntosh John P.
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