Device for producing a gas cushion

C - Chemistry – Metallurgy – 03 – B

Patent

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Details

C03B 23/035 (2006.01) C03B 35/24 (2006.01)

Patent

CA 2520047

The gas cushion serves to support a preheated glass sheet and is produced by a chamber, which is connected to a source (21) of compressed gas. The upper wall (10) of the chamber is adapted to the shape of the glass sheet and has a plurality of apertures for the passage of gas in the form of nozzles (14), which comprise an entry bore (22) and, following thereupon, a progressively widening exit hole (16) with a nozzle exit area (15). The upper wall (10) of the chamber has a greater degree of perforation (sum of the nozzle exit areas (15) in relation to the total area of the respective zone) in its edge zone (12, 13) than in its central zone (11). The nozzles ensure that no jet marks can arise. The gas of the gas cushion can also flow out undisturbed at the side, so that no cooling edges are present and the occurrence of cooling shadows is accordingly avoided.

Le coussin de gaz de l'invention sert de support à une feuille de verre préchauffée. Il est produit par une chambre reliée à une source (21) de gaz comprimé. La paroi supérieure (10) de la chambre est adaptée à la forme de la feuille de verre et présente plusieurs ouvertures de passage du gaz sous forme de buses (14) comprenant un alésage d'entrée (22) prolongé d'un orifice de sortie (16) qui s'agrandit progressivement et présente une surface de sortie de la buse (15). La paroi supérieure (10) de la chambre comporte plus de perforations (somme des surfaces de sortie de la buse (15) par rapport à la surface totale de la zone respective) dans sa zone périphérique (12, 13) que dans sa zone centrale (11). Les buses empêchent l'occurrence de marques de pulvérisation. Le gaz présent dans le coussin de gaz peut aussi s'écouler vers l'extérieur sans obstacle sur le côté, ce qui évite la présence de bords de refroidissement et, par voie de conséquence, la survenue d'ombres de refroidissement.

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