Method of and apparatus for selectively heating molten glass str

Details Method of and apparatus for selectively heating molten glass str Method of and apparatus for selectively heating molten glass str

1981-05-20

1982-11-30

Kellogg, Arthur D.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 993, 65135, 65136, 651824, C03B 1810

Patent

active

043614302

ABSTRACT:
Apparatus for selectively heating marginal edge portions of a stream of molten glass includes at least two independent heating elements presenting a substantially planar heating face toward the marginal edge of a stream of molten glass flowing in close proximity thereunder. A first set of the heating elements overlies a portion of the marginal edge adjacent a containing sidewall and the second set is positioned inboard of the first set relative to the central portion of the stream. Generated heat is directed primarily downward, e.g., greater than about fifty percent, and preferably greater than seventy-five percent toward first and second distinct areas of the marginal edge by a thermal insulating barrier positioned over the heating elements, to provide first and second localized zones of heating. The heating elements may be cantilevered through the sidewall in close proximity to the stream of molten glass.

REFERENCES:
patent: 2413037 (1946-12-01), DeVoe
patent: 2533773 (1970-10-01), Fujimoto et al.
patent: 3233995 (1966-02-01), Javaux
patent: 3445214 (1969-05-01), Ormesher
patent: 3450516 (1969-06-01), Emhiser et al.
patent: 3622299 (1971-11-01), Swillinger
patent: 3930827 (1976-01-01), Pollock
patent: 3973940 (1976-08-01), Edge et al.
patent: 3976460 (1976-08-01), Kompare et al.
patent: 4029488 (1977-06-01), Rhett
Marketing Brochure, Thermcraft, Inc., for High Temperature Electric Heaters, Winston-Salem, NC.

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