(19)
(11) EP 0 423 092 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
25.03.1992 Bulletin 1992/13

(43) Date of publication A2:
17.04.1991 Bulletin 1991/16

(21) Application number: 90850322.0

(22) Date of filing: 01.10.1990
(51) International Patent Classification (IPC)5: D21D 1/20
(84) Designated Contracting States:
AT DE FR GB IT SE

(30) Priority: 05.10.1989 FI 894730

(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) Procedure for the refining of a pulp mixture or equivalent in a refiner


    (57) 1. Procedure for the refining of a pulp mixture or equivalent in a refiner comprising oppositely placed refiner blades (1, 2), of which the rotor blade (1) rotates and the stator blade (2) is stationary, a pulp refining zone being formed between the blades. In the refiners currently used, there is no adequate provision for ensuring that the refiner will refine that fraction which has not yet been refined or that the fractions already refined will not be over-refined. The procedure of the invention solves this problem in that, by making use of the forces generated by the rotation of the rotor blade (1), the pulp mixture is separated into fractions or part of the pulp mixture is directed away from the area of the refiner blades for fractionation.







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