Method of bending glass plate

Details Method of bending glass plate Method of bending glass plate

1990-03-23

1991-04-23

Woodard, Joye L.

Glass manufacturing

Processes

Reshaping or surface deformation of glass preform

65107, 65273, C03B 23023

Patent

active

050096915

ABSTRACT:
The invention provides an improved method of heating a glass plate for bending the glass plate into a predetermined shape having a radius of curvature not greater than 3000 mm, and not greater than 2000 mm if the glass plate is thinner than 6 mm. The glass plate is heated in its entirety in a usual manner, and during the heating at least one end region of the glass plate is additionally heated by forced convection such that the heat transfer coefficient on at least one major surface of the glass plate in the end regions(s) becomes greater than in the remaining region by 5-50 kcal/m.sup.2 .multidot.h.multidot..degree.C. in bending a glass plate thinner than 6 mm and by 10-65 kcal/m.sup.2 .multidot.h.multidot..degree.C. in bending a thicker glass plate. The additional heating has the effect of preventing optical distortion of the bent glass plate in end regions by diminishing local and irregular concavities.

REFERENCES:
patent: 3340037 (1967-09-01), Stevenson
patent: 4726832 (1988-02-01), Kajii et al.

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