Method and apparatus for controlling the temperature of glass sh

Details Method and apparatus for controlling the temperature of glass sh Method and apparatus for controlling the temperature of glass sh

1992-01-08

1994-01-18

Woodard, Joye L.

Glass manufacturing

Processes

Reshaping or surface deformation of glass preform

65104, 65106, C03B 2303

Patent

active

052796353

ABSTRACT:
A method of and apparatus for establishing a predetermined thermal profile in a glass sheet immediately prior to press bending outside the heating furnace. The press bending members are provided with arrays of heating elements that are individually or zone regulated to assist in establishing an optimum temperature profile in the glass sheet conducive to proper bending. The temperature profile established in the heated sheet by the arrays of heating elements is coordinated with that established in the furnace and subsequently, modified by heat dissipation as the glass sheet advances to the bending station to achieve the proper bending temperature. The heating elements can also be utilized to create a temperature profile in the glass sheet generally higher than that originally established in the furnace. The sheet can be held in contact with one or both of the heated press members for a brief period of time after bending to slow the cooling rate of the sheet and increase the edge strength of the marginal edge area thereof.

REFERENCES:
patent: 3421875 (1969-01-01), Kirkman
patent: 3753673 (1973-08-01), Pickard et al.
patent: 3854920 (1974-12-01), Kay et al.

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