Method and apparatus for bending a glass sheet

Details Method and apparatus for bending a glass sheet Method and apparatus for bending a glass sheet

2006-12-14

2011-10-11

Daniels, Matthew (Department: 1741)

Glass manufacturing

Processes

Reshaping or surface deformation of glass preform

C065S291000

Reexamination Certificate

active

08033138

ABSTRACT:
It is an object of the present invention to provide a method for bending a glass sheet which can appropriately prevent cloth mark due to suctioning.The present invention is characterized by a method for bending a glass sheet comprising a heating step for heating a glass sheet to soften the glass sheet, and a bending step for bending the heated and softened glass sheet to have a predetermined shape, wherein the bending step comprises a step of pressing the heated and softened glass sheet, whose edges are supported by a supporting frame, against a forming surface of a bending mold opposed to the supporting frame, and a vacuum forming step for providing a negative pressure through a plurality of suction holes formed on the forming surface so that the shape of the pressed glass sheet is bent along the forming surface of the mold, and wherein in the vacuum forming step, the plurality of suction holes are grouped into at least two groups, and the raised negative pressures for the respective groups are lowered at different timings.

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