Method of thermal toughening of glass in a fluidized bed
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United States of America Patent
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Aug 23, 1983
Issued Date -
N/A
app pub date -
Oct 19, 1979
filing date -
Aug 17, 1978
priority date (Note) -
Expired
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Abstract
Glass is heated to a temperature above its strain point and is thermally toughened by chilling with a quiescent gas-filuidized particulate material which has gas-generating properties and a mean particle size in the range 30 .mu.m to 120 .mu.m, a particle size distribution in the range 1.15 to 2.78, a flowability in the range 69.5 to 92, and a thermal capacity per unit volume at minimum fluidization in the range 0.7 to 1.59 MJ/m.sup.3 K. The invention is particularly suitable for thermally toughening glass sheets for vehicle windscreens.
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