| 摘要 |
In a vessel, in particular in an ampoule having a prestress produced at a determined spot of the vessel and which permits an automatic opening of the vessel at this spot following scratching by means of a suitable tool, this prestress is produced exclusively by means of an earlier thermal treatment without the application of a tool; this prestress exhibits a stress profile in which an initially produced tensile stress ring, which runs around the perimeter of the glass vessel, is overlapped at a spot by a point-shaped compressive stress zone that is produced subsequently. |
