Method for making container closures

Details Method for making container closures Method for making container closures

B - Operations, Transporting

21

D

113/27

B21D 51/26 (2006.01) B21D 51/38 (2006.01)

Patent

CA 1053081

Abstract of the Disclosure Our United States Patent 3.881,437 and corresponding Canadian Patent 1,016,416 discloses successive steps for providing in sheet metal a fractured but integral section whereby a disruptable container closure is at least partly defomed. In contradistinction thereto the present method of creating a tear line in metal, of particular advantage when such a weakening line is to be uniformly reproduced in tougher-sheet metal, involves combining the initial steps of (a) bending the largely unrestrained sheet material to form the closure periphery with tension inherent therein, and (b) concurrently coining longitudinally that portion of the periphery which is in tension thus to induce exactly to the required degree the fracture at the desired weakening line. Final steps of swaging and coating with sealant may then follow as hitherto taught to provide lids with easy-open closures capable of retaining fluid pressure.

250710

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