Abstract:
A closure that includes a top panel and a skirt extending downwardly from a peripheral edge of the top panel is provided. The skirt terminates in a plurality of spaced thread engagement flanges for engaging the thread of the neck of a container. The closure includes a polymer-filled channel which connects the top panel to the skirt. When engaged with the threaded neck of a container, the neck is forced into the channel and engaged by the polymer so that the channel and polymer provide lateral rigidity to the neck. This rigidity prevents the neck from deflecting from the forces resulting between the threads and thread engagement lugs when the forces therebetween are increased to the level required to adequately seal the closure to the container.
Abstract:
A collar (1) for use in closing a can so as to enable the can (10) to be closed by a screw or twist-off style of closure (20). The collar (1) has channels (7) on its inner wall which extend from one end of the collar (1) to the other to provide continuous venting, and castellations (9) around one edge. When fitted to a necked can (10), the collar (1) is retained by an outward curl (11) at the free edge of the neck of the can (10). This curl (11) is typically about 0.5 mm in radius and is fully closed up. When high internal pressures are imposed in a closed container, for example by a carbonated beverage, the castellations (9) embed in the tight curl (11), preventing both opening of the curl (11) and spinning of the collar (1).