Coating glass sheets on both surfaces

Details Coating glass sheets on both surfaces Coating glass sheets on both surfaces

1974-02-13

1976-06-01

Gwinnell, Harry J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

427209, 427210, 427374, 427376, 427380, 428428, B32B 900, B32B 1706

Patent

active

039611205

ABSTRACT:
Coating a ceramic substrate on a second major surface while avoiding damage to a coating comprising a matured enamel frit previously applied to the first major surface. After coating one major surface with an enamel frit composition and maturing its frit component thereon, the substrate is oriented with its matured enamel frit coating facing downward and coated on its second major surface with one or more frit compositions that must be heated to an elevated temperature at which the previously matured frit coating would be prone to damage on contacting a solid member. This invention avoids such damage by supporting said matured frit on a gas bed in spaced relation to any solid member capable of demaging the enamel frit component during the portion of the heating and cooling cycle needed to mature the frit coating on the second major surface when the temperature of the substrate is elevated to a minimum temperature approaching that at which the previously matured frit would be prone to such damage. Each major surface is provided with one or more matured frit coatings which may be either superimposed on one another or in the form of discrete patterns or a combination of both.

REFERENCES:
patent: 2220862 (1940-11-01), Blodgett
patent: 2559969 (1951-07-01), Kennedy
patent: 3107177 (1963-10-01), Saunders et al.
patent: 3223549 (1965-12-01), Fredley et al.
patent: 3411934 (1968-11-01), Englehart et al.
patent: 3418156 (1968-12-01), Medert et al.
patent: 3558346 (1971-01-01), Plumley
patent: 3619240 (1971-11-01), Toussaint
patent: R25767 (1965-04-01), Auffenorde et al.

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