Mold apparatus and method for vacuum forming glass sheets

C - Chemistry – Metallurgy – 03 – B

Patent

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Details

C03B 11/06 (2006.01) C03B 23/035 (2006.01)

Patent

CA 2339227

Glass sheet forming apparatus (12) and a glass sheet forming method utilize a mold (20) having a curved forming face (22) with holes (26) in which a vacuum is drawn to form a glass sheet. A vacuum distributor (48) of the apparatus distributes a vacuum impulse of at least 0.1 atmospheres of vacuum from a valued vacuum reservoir (52) through a plurality of tubes (58) to a limited number of the holes (26) to provide additional forming of the glass sheet. The vacuum impulse distributor (48) is located within a vacuum chamber of the mold (20) that draws the vacuum by a gas jet pump in the holes (26) to which the vacuum impulse is not distributed.

Cette invention se rapporte à un appareil (12) et à un procédé de formage de feuilles de verre, qui utilisent un moule (20) présentant une face de formage courbe (22) pourvue de trous (26) par lesquels est créé un vide d'air destiné à former une feuille de verre. Un distributeur de vide d'air (48) faisant partie de l'appareil distribue une impulsion de vide d'air d'au moins 0,01 atmosphères à partir d'un réservoir de vide à valve (52) par l'intermédiaire de plusieurs tubes (58) jusqu'à un nombre limité de trous (26), pour permettre un formage additionnel de la feuille de verre. Ce distributeur d'impulsion de vide (48) est situé dans une chambre sous vide du moule (20) qui crée le vide d'air au moyen d'une pompe à jet de gaz par l'intermédiaire des trous (26) dans lesquels l'impulsion de vide n'est pas distribuée.

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