Thermal treatment of glass sheets

Details Thermal treatment of glass sheets Thermal treatment of glass sheets

1979-04-19

1980-09-09

Kellogg, Arthur D.

Glass manufacturing

Processes

Glass preform treating

65104, 65115, 65348, 165104F, C03B 2700

Patent

active

042215790

ABSTRACT:
A glass sheet is thermally treated, for example thermally toughened, by heating the glass sheet, and lowering the sheet into a gas-fluidized bed of particulate material which is at a glass-treatment temperature, for example quenching temperature. Extraction of gas from a localized upper region of the bed is commenced prior to the lowering of the hot glass sheet into the bed in order to produce gradually an unfluidized static packed condition of the material in that upper region of the bed. The glass sheet is lowered into the bed at a time after commencement of gas extraction which is such that the lower edge of the sheet passes through that upper region prior to full attainment of the static packed condition.

REFERENCES:
patent: 3423198 (1969-01-01), McMaster et al.
patent: 4066430 (1978-01-01), Franz

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