Patent ID: 7942028

Claim:
A process for forming a curl in a neck of a closeable container comprising: providing an internal form plug having a pre-curl groove that substantially matches a desired shape for a pre-curl; providing an external forming device that has a form roller having a lip that engages said pre-curl groove of said internal form plug; placing said internal form plug into an opening in said neck of said closable container against an interior surface of said neck of said closable container at a position on said neck of said closable container where said pre-curl is to be formed; moving said external forming device so that said lip of said form roller engages an exterior surface of said neck of said closable container and is substantially aligned with said pre-curl groove of internal form plug; rotating said closable container and said form roller to form said pre-curl in said neck of said closable container; cutting said neck of said closable container along said pre-curl; inserting a second internal form plug in a longitudinal, inward direction in said neck of said closable container adjacent to said interior surface of said neck at a position that is displaced in said longitudinal, inward direction from said pre-curl; aligning an intermediate curl groove on an intermediate curl roller with said pre-curl; moving said intermediate curl roller in said longitudinal, inward direction so that said intermediate curl groove in said intermediate curl roller engages said pre-curl; causing rotation between said closable container and said intermediate curl roller so that said intermediate curl groove progressively engages said pre-curl to form an intermediate curl in said neck; aligning a final curl groove on a final curl roller with said intermediate curl; moving said final curl roller in a lateral, transverse direction so that said final curl groove engages said intermediate curl; causing rotation between said closable container and said final curl roller so that said final curl groove progressively engages said pre-curl to form a completed curl in said neck.