Bending thin glass

Abstract

The invention relates to a device for manufacturing curved glass, said glass comprising a glass sheet or a stack of glass sheets, called the glass, comprising a bending station, said bending station comprising a solid concave bending upper mold and a lower countermold that is complementary to the upper mold, the bending upper mold being placed above the lower countermold, a means for conveying theglass to a final holder placed under the bending upper mold, the final holder being circumscribed, seen from above, by the lower countermold, the final holder forming a surface for receiving the glass, the glass being in an optimal bending position when on this surface, the lower countermold being of the frame type and being able to move vertically in order to pass below or above the surface forreceiving the glass, the bending upper mold and the lower countermold being able to move with a relative vertical movement that allows them to be brought together, in order to clamp therebetween the periphery of the glass, and to move apart from each other, the bending upper mold being equipped with orifices in its face that makes contact with the glass and a means for applying suction in order tocurve the glass against its contact face via suction applied through said orifices. The invention also relates to the process for bending glass with the device according to the invention. The invention more particularly relates to the glass of at most 1.3 mm thickness, or even of at most 1 mm thickness.

Description

technical field [0001] The present invention relates to a device and a process for bending glass sheets, in particular sheets of small thickness, in particular of less than or equal to 1.3 mm, and even of less than or equal to 1 mm. Background technique [0002] Laminated glazing, which has been the subject of much work over the past few years, has one pane of glass that is thinner than the others, and in particular has a thickness of less than or equal to 1.3 mm. Thin sheets especially have the advantage of being light and cold-formable, their integration into laminated glazing resulting in high-quality glazing. Specifically, peripheral blistering or delamination at the glass / PVB interface is minimized when thin glass sheets are incorporated into laminated glazing. The smaller the thickness of the glass used, the less severe these negative effects will be. [0003] The bending device settings depend inter alia on the plate thickness and it is difficult to bend plates with...

AI Technical Summary

Problems solved by technology

This process has the disadvantage of implementing gravity pre-bending, and thus has the disadvantage of requiring multiple skeletal molds (i.e., the series of brackets), and of requiring a vacuum upper mold half

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