Glass vessel, in particular an ampoule, and a method for...

Details Glass vessel, in particular an ampoule, and a method for... Glass vessel, in particular an ampoule, and a method for...

C - Chemistry, Metallurgy

03

B

190/138, 49/77

C03B 32/00 (2006.01) A61J 1/06 (2006.01) B65D 17/28 (2006.01) C03B 27/012 (2006.01) C03B 33/095 (2006.01)

Patent

CA 1320344

ABSTRACT In a vessel, in particular in an ampoule having a prestress produced at a de- termined spot of the vessel and which permits an automatic opening of the ves- sel at this spot following scratching by means of a suitable tool, this pre- stress 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.

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