Title:
METHOD OF MAKING A CAN HAVING A RECESSED BASE
Document Type and Number:
WIPO Patent Application WO2002036284
Kind Code:
A3
Abstract:
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.
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Inventors:
KIRK WILLIAM
Application Number:
PCT/EP2001/012581
Publication Date:
September 06, 2002
Filing Date:
October 25, 2001
Export Citation:
Assignee:
CROWN CORK & SEAL TECH CORP (US)
METAL BOX PLC (GB)
METAL BOX PLC (GB)
International Classes:
B21D22/30; (IPC1-7): B21D51/26; B65D23/14
Domestic Patent References:
| WO1983001916A1 | 1983-06-09 |
Foreign References:
| EP0547636A1 | 1993-06-23 | |||
| EP0425124A1 | 1991-05-02 | |||
| US5938389A | 1999-08-17 |
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