Method of thermal toughening of glass in a fluidized bed

Details Method of thermal toughening of glass in a fluidized bed Method of thermal toughening of glass in a fluidized bed

1979-10-19

1983-08-23

Kellogg, Arthur D.

Glass manufacturing

Processes

Glass preform treating

65104, 65116, C03B 2700

Patent

active

044001932

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.

REFERENCES:
patent: 3075580 (1963-01-01), Davis, Jr.
patent: 4066430 (1978-01-01), Franz
patent: 4113458 (1978-09-01), Cross
patent: 4120681 (1978-10-01), Cross et al.
patent: 4300936 (1981-11-01), Quillevere et al.
Annealing & Fluidized-Bed Quenching of Nimonic-Alloy Sheet, Sep. 62, "Sheet Metal Industries", by I. Astley & W. Merrett.
Advanced Inorganic Chemistry, M.I.T., Cambridge, Mass., p. 439, 2nd Revised Edition by F. A. Cotton & G. Wilkinson, 1966, Interscience Publishers.
Comprehensive Inorganic Chemistry, Pergamon Press, pp. 1032-1036 (after 1972).

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