Abstract: An injection molding apparatus produces a one-piece molded end closure has a pull ring spaced from a main panel, which has an annular flange extending therefrom and may have score lines. The pull ring is connected to the main panel by a tenon. The apparatus includes a slidable member disposed in a first passage in a core having a cavity surrouding a portion of the first passage. The core and the slidable member have end surfaces spaced from an end surface of a cavity insert to form a recess therebetween into which molten plastic is injected to form the main panel. The core has a second passage communicating the recess with the cavity in the core so that the molten plastic flows into the cavity to form the pull ring with the tenon being formed in the second passage in the core.

Abstract: A one-piece molded end closure has a pull ring spaced from a main panel having an annular flange extending therefrom. When the end closure is frangible through having score lines formed in the main panel, the pull ring is connected by a tenon adjacent a score point, which is the junction of two score lines and inside of the inner diameter of the pull ring, so that pulling on the pull ring, which is substantially parallel to the main panel, starts rupturing of the two score lines. The end closure also may be a plug type having a friction fit within a container whereby there are no score lines; the pull ring is still used to remove the end closure from the open end of the container. The method and apparatus for molding enable production of the end closure as one piece without any tearing of the pull ring or rupturing of the score lines when the end closure is removed from the molding apparatus.

Abstract: A one-piece molded end closure has a pull ring spaced from a main panel having an annular flange extending therefrom. When the end closure is frangible through having score lines formed in the main panel, the pull ring is connected by a tenon adjacent a score point, which is the junction of two score lines and inside of the inner diameter of the pull ring, so that pulling on the pull ring, which is substantially parallel to the main panel, starts rupturing of the two score lines. The end closure also may be a plug type having a friction fit within a container whereby there are no score lines; the pull ring is still used to remove the end closure from the open end of the container. The method and apparatus for molding enable production of the end closure as one piece without any tearing of the pull ring or rupturing of the score lines when the end closure is removed from the molding apparatus.