Vacuum holder with anti-bulging means used to shape glass...

Details Vacuum holder with anti-bulging means used to shape glass... Vacuum holder with anti-bulging means used to shape glass...

C - Chemistry, Metallurgy

03

B

269/1, 294/2, 49

C03B 23/035 (2006.01)

Patent

CA 1203383

Abstract A vacuum holder for holding sheets of heat-softenable material such as glass thereagainst by vacuum during their fabrication into shaped sheets comprising a lower sheet wall that has flanking portions slit longitudinally to provide strips extending longitudinally from a central portion, the width of the strips being limited to limit transverse bulging as the holder becomes hot during a sheet shaping campaign. Longitudinal slots of increasing length from a selected transverse line, preferably one traversing the geometric center of the sheet, control longitudinal bulging of the holder.

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