Method for preventing contamination of an inner surface of a hollow glass body by alkali compounds and glass container, especially for medicinal purposes
US7980096B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 23, 2003 |
| Grant date | Jul 19, 2011 |
| Priority date | — |
| Expiry date | Apr 27, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01L3/56
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.