(19)
(11) EP 1 242 678 A1

(12)

(43) Date of publication:
25.09.2002 Bulletin 2002/39

(21) Application number: 00956547.4

(22) Date of filing: 25.08.2000
(51) International Patent Classification (IPC)7D21C 9/14
(86) International application number:
PCT/FI0000/724
(87) International publication number:
WO 0101/4632 (01.03.2001 Gazette 2001/09)
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 26.08.1999 FI 991815
26.08.1999 FI 991816
26.08.1999 FI 991817

(71) Applicant: Andritz-Ahlstrom Oy
01800 Helsinki (FI)

(72) Inventors:
  • ALASTALO, Jaana
    FIN-02210 Espoo (FI)
  • PIKKA, Olavi
    FIN-48600 Karhula (FI)
  • VEHMAA, Janne
    FIN-49210 Huutjärvi (FI)

(74) Representative: HOFFMANN - EITLE 
Patent- und RechtsanwälteArabellastrasse 4
81925 München
81925 München (DE)

   


(54) METHOD FOR BLEACHING PULP WITH CHLORINE DIOXIDE