Pilkington Automotive Deutschland Gmbh

Peter Michels

Joachim Pilz

Dieter Funk

The glass sheets () of an asymmetric glass-sheet pair, which is intended for the production of laminated glass, are preheated in a preheating furnace () and then undergo a press-bending process in a press-bending station (). By means of a temperature measuring point () arranged at the exit of the press-bending station, it is ensured that the glass sheets exhibit a uniform bending behavior, in order to guarantee identical restoring forces during cooling. The temperature measuring point () is connected to a control device (), which causes an intermediate cooling of the glass sheet heating more rapidly by means of an intermediate cooling installation () in the pre-heating furnace and/or lengthens its dwell time in the press-bending station () by means of a timing control element ().

Process and plant for the treatment of the glass sheets of an asymmetric glass-sheet pair

The gas cushion serves to support a preheated glass sheet and is produced by a chamber, which is connected to a source () of compressed gas. The upper wall () 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 (), which comprise an entry bore () and, following thereupon, a progressively widening exit hole () with a nozzle exit area (). The upper wall () of the chamber has a greater degree of perforation (sum of the nozzle exit areas () in relation to the total area of the respective zone) in its edge zone () than in its central zone (). 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.

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Sprockhovel, Germany

Peter Michels