| 摘要 |
A method of making a can having a recessed base (12) and, in particular, to a method of forming a recessed base (12) in can bodies of the type which include a side wall (14) having flutes or grooves (16) defined therein. A first forming step creates a preform having a side wall with at least one axially extending rib formed therein and a base which is coextensive with the side wall and intersects the side wall at a rim. This first forming step is performed so that at least a portion of the base is recessed by a predetermined depth with respect to the rim. The method further includes a second step which comprises a further drawing operation to form a can body having a recessed base. It is important that the predetermined depth be sufficient to prevent any of the axially extending ribs from being drawn into the recessed base. |
