(19)
(11) EP 0 408 268 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
20.03.1991 Bulletin 1991/12

(43) Date of publication A2:
16.01.1991 Bulletin 1991/03

(21) Application number: 90307427.6

(22) Date of filing: 06.07.1990
(51) International Patent Classification (IPC)5: B65D 17/50, B21D 51/38
(84) Designated Contracting States:
AT BE CH DE DK ES FR GR IT LI LU NL SE

(30) Priority: 10.07.1989 GB 8915787

(71) Applicant: CarnaudMetalbox plc
Worcester WR5 1EQ (GB)

(72) Inventors:
  • Longstaff, Keith
    Worcester WR2 6BY (GB)
  • Simmons, John Stanley
    Wichenford, Worcester WR6 6YR (GB)
  • West, Keith
    Grove, Oxfordshire OX12 0AA (GB)

(74) Representative: Driver, Virginia Rozanne et al
Page White & Farrer 54 Doughty Street
London WC1N 2LS
London WC1N 2LS (GB)


(56) References cited: : 
   
       


    (54) Method and apparatus for manufacturing a ring for a container closure


    (57) A container closure has a diaphragm (3) supported by a ring (2). The diaphragm (3) has a pull tab (4) for peeling the diaphragm (3) from the supporting ring (2). The supporting ring (2) has a peripheral formation for securing the ring to a container body and extending radially inwardly therefrom an annular ledge having inner and outer parts (8), (9), axially spaced by a step portion (10). The inner part (9) extends into an annular curl (11) and then back on itself to overlie the inner annular part (9). In this way, the cut edge (112) of the annular blank from which the ring is formed is protected from the atmosphere and from the contents of the can. The invention provides a method and apparatus for manufacturing such a closure.







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