(19)
(11) EP 0 475 669 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
20.01.1993 Bulletin 1993/03

(43) Date of publication A2:
18.03.1992 Bulletin 1992/12

(21) Application number: 91308097.4

(22) Date of filing: 04.09.1991
(51) International Patent Classification (IPC)5: D21C 9/00, D21D 5/28
(84) Designated Contracting States:
AT DE ES FR GB SE

(30) Priority: 05.09.1990 FI 904374

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

(72) Inventors:
  • Koso, Arto
    SF-48600 Karhula (FI)
  • Reponen, Voitto
    SF-48600 Karhula (FI)
  • Vesala, Reijo
    SF-48300 Kotka (FI)

(74) Representative: Gilmour, David Cedric Franklyn et al
POTTS, KERR & CO. 15 Hamilton Square
Birkenhead Merseyside L41 6BR
Birkenhead Merseyside L41 6BR (GB)


(56) References cited: : 
   
       


    (54) A mass tower and apparatus for the discharge thereof


    (57) The present invention relates to an apparatus for the discharge of a mass tower as used in the pulp and paper industry, which tower is, in use, filled with medium or high consistency pulp. The invention is characterized in that a separate pump (34) is attached to the tower (10) and communicates with the inside of the tower (10) via a suction duct (32, 42) extending to the zone of moving pulp.






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