(19)
(11) EP 0 421 968 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
01.04.1992 Bulletin 1992/14

(43) Date of publication A2:
10.04.1991 Bulletin 1991/15

(21) Application number: 90850323.8

(22) Date of filing: 01.10.1990
(51) International Patent Classification (IPC)5D21D 1/22
(84) Designated Contracting States:
AT DE FR GB IT SE

(30) Priority: 05.10.1989 FI 894732

(71) Applicant: SUNDS DEFIBRATOR JYLHÄ OY
SF-37601 Valkeakoski (FI)

(72) Inventor:
  • Lumiainen, Jorma
    SF-37630 Valkeakoski (FI)

(74) Representative: Roth, Ernst Adolf Michael et al
GÖTEBORGS PATENTBYRA AB Box 5005
S-402 21 Göteborg
S-402 21 Göteborg (SE)


(56) References cited: : 
   
       


    (54) Conical refiner


    (57) A conical refiner for the refining of paper pulps or the like, comprising a stationary stator blade (2) and a rotating rotor blade (1), with a refining zone (6) formed between the blades so that one end of the refining zone opens to the pulp infeed side and the other end to the delivery side of the refiner. A drawback with currently used refiner constructions is that the pulp fed into the refiner is not refined uniformly, so that the pulp flowing out of the refiner contains both refined fibres and fines and unrefined fibres. In prior art, these have been screened only after the refining. In the present invention, the refiner is provided with a screening unit (4, 7) working on the principle of a pressure screen, the screen plate (4) of the screening unit being of an essentially cylindrical form and coaxial with the refiner blades (1, 2), said screening unit being fixedly connected to the stator blade and located at a desired point in the direction of the pulp flow. The rotor blade (1) has a cylindrical shape in the region of the pressure screen (4, 7) and is provided with a component (3) producing the driving power for the pressure screen.





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