C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
269/1, 294/2, 49
C03B 23/035 (2006.01)
Patent
CA 1199794
ABSTRACT When sheets of glass or other deformable material are shaped by a method that comprises the use of a vacuum holder having a lower sheet wall provided with an array of apertures through which air is drawn by vacuum to engage a sheet to be shaped by vacuum, the array must be larger than each dimension of the sheet to be shaped so that when the sheet arrives at a shaping station in proper alignment for engagement by the vacuum holder, there is a continuous line of apertures beyond each side of the sheet to be engaged by suction. Otherwise, when the sheet is engaged by suction, it is displaced an uncontrolled amount transversely and/or longitudinally en route to engagement by the apertured lower wall. Since the amount of displacement cannot be controlled under such circumstances, the sheet becomes misaligned relative to its desired position of engagement against the vacuum holder. By providing apertures at approximately equal distances around the periphery of the sheet, this tendency for displacement is minimized.
429893
Kellar John D.
Pereman Gordon F.
Gowling Lafleur Henderson Llp
Ppg Industries Ohio Inc.
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