Evacuated glazing consists of two sheets of glass separated by a small gap, hermetically sealed around the edges, and containing a thermally insulating vacuum. This article describes techniques to determine the time necessary to evacuate such a device through a small pump out tube. The time constant for pressure reduction is determined by numerical modeling. An approximate analytic method is also developed which gives results in good agreement with the numerical data. The numerical results are validated by experimental measurements. It is shown that samples of area about 1 m2 and internal gap ∼0.2 mm can be evacuated in a few minutes through a small pump out tube. It is therefore likely that the evacuation time in the production process of evacuated glazing will be dominated by the heating and cooling cycles associated with outgassing of the internal surfaces, rather than by the pumping process itself.
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January 1994
Research Article|
January 01 1994
Pump down of evacuated glazing
D. A. Clugston;
D. A. Clugston
School of Physics, University of Sydney, Sydney NSW 2006, Australia
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R. E. Collins
R. E. Collins
School of Physics, University of Sydney, Sydney NSW 2006, Australia
Search for other works by this author on:
D. A. Clugston
R. E. Collins
School of Physics, University of Sydney, Sydney NSW 2006, Australia
J. Vac. Sci. Technol. A 12, 241–247 (1994)
Article history
Received:
July 12 1992
Accepted:
October 09 1993
Citation
D. A. Clugston, R. E. Collins; Pump down of evacuated glazing. J. Vac. Sci. Technol. A 1 January 1994; 12 (1): 241–247. https://doi.org/10.1116/1.578891
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