Method for preventing contamination of an inner surface of a...

Details Method for preventing contamination of an inner surface of a... Method for preventing contamination of an inner surface of a...

2011-07-19

2011-07-19

Dehghan, Queenie (Department: 1741)

Glass manufacturing

Processes

Reshaping or surface deformation of glass preform

C065S111000, C065S112000, C065S113000, C065S299000, C065S300000

Reexamination Certificate

active

07980096

ABSTRACT:
In order to avoid deposition of evaporating alkali compounds on an inner surface of a hollow glass body during thermal processing to form a glass container from the hollow glass body, an overpressure is provided in the hollow glass body during the thermal processing. Either rinsing the hollow glass body with a gas, such as air, or at least partially closing the glass body at one end so that sufficiently rapid pressure equilibration is avoided, can provide this overpressure. The glass containers made by these methods are especially suited for food or pharmaceuticals because they have a reduced alkali release from their inner surfaces, for example at most about 2.0 mg/l sodium oxide.

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patent: 100 47 850 (2002-04-01), None
Heinz G: Schott-Glaslexikon, Landsberg an Lech, MGV-Verlag, 1997.

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