Isopipe sag control using improved end support conditions
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United States of America Patent
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Sep 1, 2015
Grant Date -
Oct 20, 2011
app pub date -
Jun 29, 2011
filing date -
May 11, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
The invention is directed to a method of preventing isopipe sag when using the overflow drawdown fusion process for making flat glass sheets. The method applies a vertical restraint on at least one end of an isopipe resting on a support to thereby reduce sage and/or the rate of sag during use of the isopipe. Using the vertical restraint block in accordance with the invention, the sag and/or rate of sag has been found to be reduced by at least 40 percent relative to an isopipe that does not use the vertical restraints of the invention or a compressive force along the sides of the isopipe.
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