Tooling arrangement for end closure scoring

Details Tooling arrangement for end closure scoring Tooling arrangement for end closure scoring

1975-04-25

1976-07-20

Larson, Lowell A.

113 15A, 113 80DA, B21D 5126, B21D 5146

Patent

active

039700232

ABSTRACT:
An improved tooling configuration enables production of an end panel opening score line without loss of the enamel protective coating on the reverse side of the end panel. Current scoring methods frequently result in enamel loss, and hence, necessitate coating repair before the end panel may be attached to the can body. By controlling the angular relationship of the score punch and anvil, while simultaneously confining the displaced metal, the enamel which was previously applied to the panel is retained substantially in place with only a slight reduction in thickness. Punch angles of 90.degree. - 100.degree. and anvil angles of 25.degree. - 35.degree. have been found to be effective, with a punch angle of 90.degree. and an anvil angle of 30.degree. being optimum. The metal may best be confined and controlled by the simultaneous formation of an anti-fracture score concentric with, and radially inward of the opening score line.

REFERENCES:
patent: 3338199 (1967-08-01), Taylor
patent: 3359773 (1967-12-01), Stuchbery
patent: 3688718 (1972-09-01), Schrecker
patent: 3868919 (1975-03-01), Schrecker et al.
patent: 3875884 (1975-04-01), Zundel

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