Method for molding a one-piece molded end closure

Details Method for molding a one-piece molded end closure Method for molding a one-piece molded end closure

1989-05-01

1991-01-08

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

249 63, 264318, 264334, 425428, 425DIG58, 425556, B29C 4544

Patent

active

049833464

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. The main panel may be formed with a single continuous score line and the pull ring not at the center of the main panel. The end closure also may be formed integral with a cylindrical side wall of the container rather than having the end closure molded separately and then being sealed to an open end of a container.

REFERENCES:
patent: 3402713 (1968-09-01), Senkowski et al.
patent: 4019711 (1977-04-01), Altenhof et al.
patent: 4210620 (1980-07-01), von Holdt
patent: 4709757 (1987-12-01), Bly

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