(19)
(11) EP 0 233 064 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
12.07.1989 Bulletin 1989/28

(43) Date of publication A2:
19.08.1987 Bulletin 1987/34

(21) Application number: 87301028.4

(22) Date of filing: 05.02.1987
(51) International Patent Classification (IPC)4: B21C 23/00, B21C 25/02
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI LU NL SE

(30) Priority: 06.02.1986 GB 8602985

(71) Applicant: ALFORM ALLOYS LIMITED
Holton Heath Poole DorsetBH16 6LF (GB)

(72) Inventor:
  • Maddock, Brian
    Broadstone Dorset (GB)

(74) Representative: Shindler, Nigel et al
BATCHELLOR, KIRK & CO. 2 Pear Tree Court Farringdon Road
London EC1R 0DS
London EC1R 0DS (GB)


(56) References cited: : 
   
       


    (54) Extrusion apparatus


    (57) An extrusion apparatus is described in which a removeable die 12 is located in a die chamber 7 within a body 6 of the apparatus. A passageway 26 leads from an inlet 25 for extrusion material to the die chamber 7. A general squared-section sealing ring 30 is positioned in the passageway adjacent to the die 12. The sealing member 30 has the corner next to the face of the die 12 and passageway wall 26 chamfered. so that extrusion material pressing against the sealing ring forces that ring into sealing engagement with the die face and passageway wall in order to present undesirable flow of extrusion material about the die into the die chamber.







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