Determination of tensile membrane stress and compressive layer t

Details Determination of tensile membrane stress and compressive layer t Determination of tensile membrane stress and compressive layer t

1994-05-26

1996-06-11

Czaja, Donald E.

Glass manufacturing

Processes

With measuring, sensing, inspecting, indicating, or testing

73760, C03B 3200

Patent

active

055251382

ABSTRACT:
A determination of the temper quality of a tempered glass sheet is made which includes determining the percentages of the thickness of a tempered glass sheet which are in compression as well as the sheet's tensile membrane stress. The process uses a CO.sub.2 laser beam, either on a painted or unpainted glass sheet, to shatter the glass sheet and then comparing the number of pulses required for the glass sheet to shatter to a correspondence, e.g., a graph, of tensile membrane stress v. compression layer thickness as a % of the total thickness of the glass sheet.

REFERENCES:
patent: 3543979 (1970-12-01), Grove et al.
patent: 3808439 (1974-04-01), Remois
patent: 3811775 (1974-05-01), Abu-Saud
patent: 4655589 (1987-04-01), Cestaro et al.
patent: 4697082 (1987-09-01), Bartelsen
patent: 5254149 (1993-10-01), Hashemi et al.

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