초록 ▼

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

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.

대표청구항 ▼

1. 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

1. 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.