Method for producing flat or arcuate glass plates

Details Method for producing flat or arcuate glass plates Method for producing flat or arcuate glass plates

1996-02-23

1997-10-14

Czaja, Donald E.

Glass manufacturing

Processes

Glass preform treating

65 3014, 65104, 65114, C03C 1500, C03B 3100, C03B 3200, C03B 2700

Patent

active

056767226

ABSTRACT:
Glass plates are thermally or chemically tempered to increase flexural bending strength. The tempered plates are subsequently subjected to a heat treatment in order to lower the possibility of spontaneous breakage of the glass plates. According to the method according to the invention the glass plates are tempered at least twice and again heat-treated. At least the second heat treatment takes place at higher temperatures than were used previously. The treated glass plates have increased flexural bending strength and reduced tendency to spontaneous breakage.

REFERENCES:
patent: 3287200 (1966-11-01), Hess et al.
patent: 3356477 (1967-12-01), Chisholm et al.
patent: 3460927 (1969-08-01), Fischer et al.
patent: 3650719 (1972-03-01), Van Laethem
patent: 4172921 (1979-10-01), Kiefer
patent: 4416930 (1983-11-01), Kelly
patent: 4846868 (1989-07-01), Aratani

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