Method and apparatus for producing hollow glass body products, and hollow glass body products and their use

Abstract

A method and apparatus is provided for producing a hollow glass body product including a hollow glass body having an outer surface with a first end portion and a second end portion, the first end portion being sealed by a first bottom and the second end portion being sealed by a second bottom. A plurality of spaced apart filamentary defects are provided in the outer surface and at least part of the filamentary defects form open passages connecting an interior of the hollow glass body to the outer surface thereof. Each individual passage has a diameter in the micrometer range between more than 0 micrometers and less than 50 micrometers. A plurality of the micrometer range-sized open passages provides a total cross-sectional area sufficiently large for venting and/or pressure equalization.

Dependencies are inferred from the claim text.