Glass manufacturing – Processes – Reshaping or surface deformation of glass preform
Patent
1994-10-14
1997-09-23
Czaja, Donald E.
Glass manufacturing
Processes
Reshaping or surface deformation of glass preform
65289, 65287, C03B 2302
Patent
active
056699522
ABSTRACT:
The present invention discloses a method for shaping glass sheets to deeply sagged configurations using a lower outline mold and an upper shaping mold while minimizing marking of the sheets by shaping molds. The outline mold includes a support rail which generally corresponding to the desired curvature of a peripheral portion of the sheets to be shaped and supports the glass sheets as they are heated and sagged by gravity to a preliminary shape. The outline mold and the upper mold are then moved relative to each other to position the molds either in close proximity to each other or to press the upper mold against the glass sheets. Pressurized gas is then directed from the mold to at least the unsupported central portions of the preliminarily shaped sheets, to urge these unsupported portions downward and shape the sheets to a desired configuration.
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Claassen George R.
Karlo Rudolph A.
Marietti Jeffrey L.
McLaughlin John L.
Rayburn David B.
Czaja Donald E.
Padgett Calvin
PPG Industries Inc.
Siminerio Andrew C.
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