Method and apparatus for bending a glass sheet
US8033138B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 2006 |
| Grant date | Oct 11, 2011 |
| Priority date | — |
| Expiry date | Feb 10, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B23/0305
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.