Closure and container neck structure therefor

Abstract From the Canadian patent

This relates to a neck structure on a domed container end for receiving a thermoplastic material closure. It particularly relates to containers having very thin walls on the order of 6-9 mils and wherein the container is formed of a metal having a grain which generally defines a fold line. In order to avoid undue deformation of the lower part of the usual ring which receives the closure body, the domed end immediately adjacent an encircling ring is provided with an upstanding bead which is shock absorbent and functions resiliently to reinforce the lower part of the ring and to restore it to its original configuration after the body of the closure has been pressed through the ring. Further …