Process and apparatus for forming tearably detachable portion on

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

1975-02-21

1976-12-14

Lanham, C.W.

113116QA, 113121C, B21D 5100

Patent

active

039968677

ABSTRACT:
The periphery of a tearably detachable portion of a sheet such as the lid of a pop-top can is weakened by cutting a groove around the periphery. The portion is then recessed by a die set, the periperhy of the portion being further weakened by plastic deformation.

REFERENCES:
patent: 3362569 (1968-01-01), Geiger
patent: 3563199 (1971-02-01), Wolfe
patent: 3741142 (1973-06-01), Stuard
patent: 3870001 (1975-03-01), Brown
patent: 3875884 (1975-04-01), Zundel
patent: 3881437 (1975-05-01), Lovell et al.

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