Method for reducing thermally induced fracture of cathode ray tu

Details Method for reducing thermally induced fracture of cathode ray tu Method for reducing thermally induced fracture of cathode ray tu

1975-04-17

1976-10-26

Bashore, S. Leon

Glass manufacturing

Processes

With destruction or delamination of transitory attached or...

65 27, 65 28, 65112, 65113, C03B 2300, C03B 1900

Patent

active

039881369

ABSTRACT:
Method for reducing the likelihood of cathode ray tube glass bulb and bulb component fracture caused by temperature cycling during tube salvage. The depicted salvage method includes heating and then cooling the exterior surfaces of a glass front panel and glass funnel to be separated, thus producing a temperature gradient between the front panel extreme border and more remote inner portions of the front panel extreme border. This temperature gradient causes circumferential tension at the front panel extreme border. The circumferential tension is reduced to thus lessen, the likelihood of front panel fracture by applying, prior to or during, said cooling, a thermal insulator over the front panel extreme border and vicinity so as to locally reduce the rate of glass surface cooling.

REFERENCES:
patent: 3350188 (1967-10-01), Barrett et al.
patent: 3390033 (1968-06-01), Brown
patent: 3929443 (1975-12-01), Leuehberger et al.

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