(19)
(11) EP 0 069 566 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
17.08.1983 Bulletin 1983/33

(43) Date of publication A2:
12.01.1983 Bulletin 1983/02

(21) Application number: 82303499

(22) Date of filing: 02.07.1982
(84) Designated Contracting States:
AT BE CH DE FR GB IT LI LU NL SE

(30) Priority: 02.07.1981 GB 8120513

(71) Applicant: JOHNSON MATTHEY PUBLIC LIMITED COMPANY
 ()

(72) Inventors:
  • Griffiths, Leonard Barry
     ()
  • O'Riordan, Brendan Peter
     ()
  • Pugh, Stuart
     ()
  • Ogunnubi-Johnson, Babatunde
     ()
  • Smith, Douglas Gordon
     ()

   


(54) Extrusion process and apparatus


(57) Formable material such as pigment filter cake is extruded in filamentary form for drying by means of a ram extruder which eradicates local zones of inhomogeneity. Pressure may be applied by the ram in two stages; a lower pressure to homogenise the material followed by a higher pressure to extrude it.
Apparatus for carrying out the process comprises a container transportable in cage between a loading/unloading station and an extrusion station.






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