Schott Ag

Franz Jaeger

Stephan Tratzky

Reiner Bartsch

Markus Riedl

Reinhard Maennl

Franz Voelkl

Karola Schneider

A method for producing glass vials, in particular pharmaceutical vials or pharmaceutical ampoules, from a glass tube is provided, the method including the following steps: (a) rotating the glass tube about a longitudinal axis thereof; (b) locally heating the glass tube from one side by means of at least one burner to at least the softening temperature of the glass; (c) reducing the diameter by pressing at least one forming body laterally against the heated region; and (d) separating the glass tube by means of a burner. A glass vial produced in such a way releases a reduced amount of alkali in accordance with ISO 4802 and has a decreased delamination tendency. Furthermore, in the hot-formed peripheral region, the alkali content is only slightly reduced when compared with the alkali content in the glass interior.

Method of producing glass vials

The glass tube assembly has an outer glass tube provided with a tapered section and an inner glass tube or rod, which is arranged inside of the outer glass tube and which has a spiral section. The tapered section is formed by one or more projections on the inner surface of the outer glass tube. Each projection extends in a longitudinal direction of the outer glass tube and does not extend around its entire circumference. The internal width of the tapered section is smaller than the outside diameter of the spiral section of the inner glass tube or rod, so that the inner glass tube or rod is reliably prevented from slipping or rotating out of the outer glass tube by its spiral section. A method of making the glass tube assembly is also described.

Method for fixing the position of a glass tube or glass rod spiral in a glass tube, glass tube assembly and the application of the same

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Tirschenreuth, Germany

Franz Jaeger