Title:
EASY-OPEN METAL END FOR A CONTAINER, AND METHOD FOR MAKING SAME
Document Type and Number:
WIPO Patent Application WO/2013/090235
Kind Code:
A3
Abstract:
An easy-open metal end and a method for making same, in which a pre-score coining operation is performed, followed by an operation to form a score line. The coining step uses gentle-radius tooling designed not to crack or cut a protective coating on the metal end. Between the coining step and the score line-forming step, a paneling step is performed to pull out the loose metal generated in the coining step, such that end tension can be controlled more easily than in a conventional process. The coining operation thins the metal, so the score line can have less penetration than, and therefore can be narrower than, a conventional score line. Consequently, even if the score line does rust, it will be very small in width and thus relatively unnoticeable.
Inventors:
DUNN DAVID K (US)
MEEKS JOHN (US)
MEEKS JOHN (US)
Application Number:
PCT/US2012/068886
Publication Date:
September 12, 2013
Filing Date:
December 11, 2012
Export Citation:
Assignee:
SONOCO DEV INC (US)
International Classes:
B21D51/38
Foreign References:
| US3687099A | 1972-08-29 | |||
| US4122791A | 1978-10-31 | |||
| US3964633A | 1976-06-22 | |||
| US3990376A | 1976-11-09 |
Attorney, Agent or Firm:
HILL, Donald, M., Jr. et al. (Bank of America Plaza101 South Tryon Street, Suite 400, Charlotte North Carolina, US)
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