| 摘要 |
<p>A method of plastically forming an axially extended zone of the interior surface of a hollow glass tube comprising heating the zone to a forming temperature; bringing the hollow glass tube and a generally cylindrical embossing mandrel connected to a driving shaft together to obtain a predetermined starting position inside said glass tube, bringing the embossing mandrel and the interior surface of the glass into contact along said zone while keeping the longitudinal axes of the mandrel and the glass tube essentially parallel, providing a relative rolling off motion between the said mandrel and the said tube while plastically forming said zone of the glass tube and finally separating the formed glass tube and the embossing mandrel. Also disclosed are glass cartridges made with the method and embossing mandrels to be used in the method.</p> |
