Patent ID: 6986863

Claim:
A method of making a container to which entry is via an opening inset from adjacent container walling of said container, said opening being in a rim of said container, said method comprising the steps of: injection molding an embryo container in a heated condition from a material susceptible to deformation when heated, said embryo container comprising a rim portion and a container-walling-forming portion, said rim portion having an upwardly-open channel formed intermediate an upstanding inner rib and a upwardly-stepped extension, said embryo container being molded in an injection mold including an inner mold core, said inner mold core being extractable through said opening, and said mold defining exterior surfaces of said rim portion of said embryo container in substantially the final form thereof; transferring said embryo container at an elevated temperature to a blow mold, said blow mold defining the required final external shape of said container walling to be formed by said container-walling-forming portion; inserting a blow pin into said opening, said blow pin being shaped to snugly fit said upwardly-open channel in said rim portion, said rim portion being snugly engaged by said blow mold and said blow pin, thereby cooling said rim portion of said embryo container, with said container-walling-forming portion of said embryo container being spaced from walls of said blow mold; stretching and expanding said container-walling-forming portion of said embryo container with blow molding into contact with said walls of said blow mold; and allowing said container to cool to set and removing said container from said blow mold.