Furnace for heating glass sheets

Details Furnace for heating glass sheets Furnace for heating glass sheets

1991-02-15

1992-06-16

Woodard, Joye L.

Glass manufacturing

Control responsive to condition sensing means

Temperature or heater control

65273, 65350, 432122, C03B 2500, C03B 2700

Patent

active

051221802

ABSTRACT:
A furnace for heating glass sheets moving along the axis of the furnace has at least one differentiated heating cell, the heating elements of which disposed at the vault side are constituted of sets of electrical resistors controlled in temperature or in power and adjustable in height independently for each set. A portion of the electrical resistors are mounted parallel to the axis of the furnace, the other heating cells each constituting a longitudinal heating zone independent of the other longitudinal zones and having, at the vault side, heating elements composed of sets of electrical resistors subdivided into several independent transverse sub-zones, in which the electrical resistors are mounted perpendicularly to the axis of the furnace. The invention is applicable to the manufacture of curved and toughened panes.

REFERENCES:
patent: 3744985 (1973-07-01), Peternel
patent: 4601743 (1986-07-01), Canfield
patent: 4824464 (1989-04-01), Perin et al.
patent: 4952227 (1990-08-01), Henington et al.

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