(19)

(11)

EP 0 932 461 A1

(12)

(43) Date of publication: 04.08.1999 Bulletin 1999/31 (21) Application number: 97945004.0 (22) Date of filing: 13.10.1997

(51) International Patent Classification (IPC):  B21D 51/ 26( . ) (86) International application number: PCT/GB1997/002812 (87) International publication number: WO 1998/017416 (30.04.1998 Gazette 1998/17)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI NL PT SE (30) Priority: 19.10.1996 GB 19960021831 (71) Applicants: CARNAUDMETALBOX PLC Wantage, Oxfordshire OX12 9BP (GB) CARNAUDMETALBOX SA 93400 Saint Ouen (FR)	(72) Inventor: CHEERS, Christopher, Francis Wiltshire SN2 2BX (GB) (74) Representative: Ratliff, Ismay Hilary, et al  CarnaudMetalbox plc, Downsview Road Wantage, Oxfordshire OX12 9BP Wantage, Oxfordshire OX12 9BP (GB)