US 9,700,929 B2 · Method for expanding the diameter of a metal container

Abstract

A method of forming a metal container comprises: curling outward a top edge of the metal container to form a curl and expanding a diameter of a first section of the metal container to form a first expanded section; wherein at least part of the first expanded section is below the curl. In some embodiments, the steps of curling outward a top edge of the metal container to form a curl and expanding a diameter of a first section of the metal container to form a first expanded section are performed in a single stroke of a single die. In some embodiments, the step of expanding a diameter of a first section of the metal container to form an expanded section is performed after the step of curling outward a top edge of the metal container to form a curl.

Claims20

Dependent claims

A method of forming a metal container comprising:

providing a one-piece metal container with a top edge defining an opening and a closed bottom;
curling outward the top edge of the metal container to form a curl;
after curling, inserting an expansion die into the opening of the metal container, thereby expanding an original diameter of a first section to and thereafter expanding the expansion die thereby forming a first expanded section of the metal container onto the metal container;
and
wherein the original diameter of the metal container is expanded by at least 5% in a single stroke of a single expansion die without prior narrowing of the metal container;
wherein at least part of the first expanded section is below the curl.

3 more elements

Dependencies are inferred from the claim text.

Method for expanding the diameter of a metal container

Life of this patent

Method for expanding the diameter of a metal container

Life of this patent

Abstract

Claims20