Method of making a can having a recessed base

Details Method of making a can having a recessed base Method of making a can having a recessed base

B - Operations, Transporting

21

D

B21D 51/26 (2006.01) B21D 22/30 (2006.01)

Patent

CA 2426788

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.

La présente invention concerne un procédé de fabrication d'une boîte-boisson à base renfoncée et, en particulier, un procédé de formation d'une base renfoncée dans les corps des boîtes-boisson du type dont la paroi latérale comporte des cannelures ou des rainures. Une première étape de formage sert à créer une avant-forme dont la paroi latérale comporte au moins une nervure venant axialement et dont la base vient dans l'extension de la paroi latérale, coupant la paroi latérale au niveau d'une bordure. Cette première étape de formage s'exécute de façon qu'une partie au moins de la base soit renfoncée d'une profondeur définie par rapport à la bordure. Le procédé comporte ensuite une seconde étape comportant une autre opération de repoussage permettant de former un corps de boîte-boisson dont la base est renfoncée. Il est important que la profondeur définie soit suffisante pour éviter que l'une au moins des nervures venant axialement ne soit repoussée dans la base renfoncée.

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