C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
49/7
C03B 23/025 (2006.01) C03B 23/033 (2006.01) C03B 27/044 (2006.01)
Patent
CA 1191688
Abstract of the Disclosure This invention relates to shaping glass sheets by roll forming to either simple or complex curvatures about a single axis of bending or to compound curvatures comprising components of curvature about mutually per- pendicular axes of bending by a controlled, repeatable program of roll forming without causing the glass sheets to stop their forward movement during their shaping. The apparatus used to perform this process has a minimum of moving parts, thus minimizing maintenance problems and reducing downtime for maintenance and repair. One embodiment of this invention represents a further improvement over the inventions described and claimed in U.S. Patents Nos. 4,123,246 and 4,l39,359 to Johnson and Wolfe. In these patents, a series of hot, flat glass sheets transfer from alternate conveyor rolls of cylindrical shape onto alternate forming rolls of transverse elevational curvature. The latter rolls increase the transverse curved lines of support for the moving glass sheets along the path of travel. The present invention incor- porates additional rolls arranged in spaced pairs of gradually decreasing separation along the path of travel to roll press the glass sheets into more precise compliance with the desired shape than previously experienced after each glass sheet in turn has been sagged to approximately the shape of a shaped forming roll. Optionally, the roll pressed glass sheets may be altered to a final desired shape by cooling the opposite major surfaces of each roll pressed glass sheet at different rates of cooling before it reaches a temperature at which the major surface portions become set in a permanent configuration.
416606
Schultz Stephen J.
Wolfe Terry L.
Gowling Lafleur Henderson Llp
Ppg Industries Ohio Inc.
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