Process and apparatus for forming rearably detachable portion on

Details Process and apparatus for forming rearably detachable portion on Process and apparatus for forming rearably detachable portion on

1975-02-21

1976-11-23

DiPalma, Victor A.

72326, 113 15R, 113 15A, B21D 5138

Patent

active

039930106

ABSTRACT:
The periphery of a tearably detachable portion of a sheet such as the lid of a pop-top can is weakened by forming a continuous thin wall at the periphery of the detachable portion. The thin wall is then folded to further weaken the periphery of the detachable portion.

REFERENCES:
patent: 1272890 (1918-07-01), Bates
patent: 3705563 (1972-12-01), Elser
patent: 3741142 (1973-06-01), Stuard
patent: 3765352 (1973-10-01), Schubert et al.
patent: 3768295 (1975-10-01), Cudzik
patent: 3848557 (1974-11-01), Holk
patent: 3868919 (1975-03-01), Schrecker et al.
patent: 3871314 (1975-03-01), Stargell
patent: 3878704 (1975-04-01), Shea

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