Apparatus for molding a one-piece molded end closure

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

1990-06-14

1991-08-06

Heitbrink, Timothy

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With product ejector

2643281, 425441, 4254501, 4254519, 425552, 425577, B29C 4538

Patent

active

050372904

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. The slidable member is removed from the first passage prior to moving the cavity insert away from the core to enable removal of the pull ring through the first passage in the core and the tenon from the second passage in the core without any tearing of the pull ring or rupturing of any score lines in the main panel when the end closure is removed from the core.

REFERENCES:
patent: 2558027 (1951-06-01), Wilson
patent: 3293693 (1966-12-01), Ohl et al.
patent: 3572424 (1971-03-01), Byrne
patent: 4496302 (1985-01-01), Brown
patent: 4618121 (1986-10-01), Conti

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