(19)
(11) EP 0 275 967 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.02.1989 Bulletin 1989/06

(43) Date of publication A2:
27.07.1988 Bulletin 1988/30

(21) Application number: 88100678.7

(22) Date of filing: 19.01.1988
(51) International Patent Classification (IPC)4: D21D 5/06
(84) Designated Contracting States:
AT DE FR GB IT SE

(30) Priority: 19.01.1987 FI 870190

(71) Applicant: A. AHLSTROM CORPORATION
29600 Noormarkku (FI)

(72) Inventors:
  • Henricson, Kaj
    SF-48100 Kotka (FI)
  • Repo, Erkki
    SF-53200 Lappeenranta (FI)
  • Rönkönharju, Hannu
    SF-48700 Kyminlinna (FI)

(74) Representative: Görg, Klaus, Dipl.-Ing. et al
Hoffmann, Eitle & Partner Patent- und Rechtsanwälte Postfach 81 04 20
81904 München
81904 München (DE)


(56) References cited: : 
   
       


    (54) Method and apparatus for separating knots


    (57) The invention relates to a method and apparatus for separating knots. In particular the method and the apparatus are meant to be used in separating knots from fibre suspensions of the wood processing industry. The knotter according to the invention uses a profiled screen cylinder (5) with which it has been found from performed tests to be most preferable to feed the pulp from the connections (2) in the direction of rotation of the screen cylinder and also to discharge the reject from the connections (4) and the accept from the connections (3) of the cylinder (5) in the direction of rotation. As a result, there is not only less wear of the screen surface, but also a significantly smaller consumption of power per pulp ton than in the apparatuses in accordance with the prior art.







    Search report