Method of making bump-up can bottom
AssigneeCrown Cork & Seal Technologies Corporation
InventorsWilliam A. Kirk, Benjamin Derr
Life of this patent
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Abstract
A method of making a can body of the type that has at least one axially extending rib formed therein includes a first forming step of creating a preform having a sidewall that has at least one axially extending rib formed therein and a bottom that is coextensive with the sidewall and intersects the sidewall at a rim. This first forming step is performed so that at least a portion of the bottom is recessed by a predetermined depth with respect to the rim. The method further includes a second step of performing a second drawing operation on the preform to form a can body having a bump-up bottom. It is important that the predetermined depth be sufficient to prevent the axially extending rib to be drawn into said bump-up bottom.
Claims13
A method of making a can body of the type that has at least one axially extending rib formed therein, comprising steps of:
- (a) performing a first drawing operation to create a cup having a sidewall that has at least one axially extending rib formed therein and a bottom that is coextensive with the sidewall and intersects the sidewall at a rim, step (a) being performed so that at least a portion of said bottom is recessed by a predetermined depth with respect to said rim;
- and
- (b) performing a second drawing operation on said cup to form a can body having a bump-up bottom, and wherein said predetermined depth is sufficient so as to prevent said axially extending rib to be drawn into said bump-up bottom.
A method of making a can body of the type that has at least one axially extending rib formed therein, comprising steps of:
- (a) providing a cup having a sidewall and a bottom that is coextensive with the sidewall and intersects the sidewall at a rim, step (a) being performed so that at least a portion of said bottom is recessed by a predetermined depth with respect to said rim;
- and
- (b) performing a forming operation on said cup to form a can body having at least one axial rib defined in its sidewall and having a bump-up bottom, and wherein said predetermined depth is sufficient so as to prevent said axially extending rib to be drawn into said bump-up bottom during the forming operation.
Dependencies are inferred from the claim text.