Process for the manufacture of rings for lids for cans

Details Process for the manufacture of rings for lids for cans Process for the manufacture of rings for lids for cans

1980-11-06

1982-12-14

Gilden, Leon

Sheet metal container making

Method

Forming or treating metallic closure

72 47, 220456, 413 18, 428418, 428457, B21D 5100

Patent

active

043635822

ABSTRACT:
The process of the present invention allows for the manufacture of lacquered aluminum or tin-plate rings which have the inner edge thereof bent over outwards so that they are suitable for the closures on cans for foodstuffs. A ring blank made of lacquered sheet is pre-shaped by deep drawing to form the curvature needed for bending over the inner cut edge. The final shaping of the pre-shaped blank into a ring for a can lid takes place, after stamping out the opening, by stretching and bending over the cut edge. When a tear-back membrane is sealed on to the bent-over edge, the ring is suitable as an easily opened closure for cans for foodstuffs.

REFERENCES:
patent: 3274964 (1966-09-01), Griese, Jr.
patent: 3287156 (1966-11-01), Griffith
patent: 3547305 (1970-12-01), Khoury
patent: 3747797 (1973-07-01), Gayner
patent: 3934527 (1976-01-01), Saunders
patent: 3951190 (1976-04-01), Suter
patent: 4090004 (1978-05-01), Gebritt et al.
patent: 4173290 (1979-11-01), Kobayashi et al.
patent: 4210259 (1980-07-01), Schrecker

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