Hardening internal and/or external glass container surface - by electric field application of alkali ion exchanger material having larger atomic vol.

摘要

In chemically hardening the internal and/or external surfaces of a glass container by exchanging alkali ions having a smaller atomic vol., present in glass surface, for alkali ions having a larger atomic vol. originating from an alkali ion exchanger material applied to the glass surface above 100 deg.C, the novelty consists in applying the alkali ion exchanger material, (A), by means of one or more electric fields, pref. electrostatic fields. The equipment used is claimed. A dense, uniform deposit of (A) can be applied to the glass surface to be hardened.