(19)
(11) EP 1 278 910 A1

(12)

(43) Date of publication:
29.01.2003 Bulletin 2003/05

(21) Application number: 01931761.9

(22) Date of filing: 04.05.2001
(51) International Patent Classification (IPC)7: D21C 9/16
(86) International application number:
PCT/FI0100/429
(87) International publication number:
WO 0108/6059 (15.11.2001 Gazette 2001/46)
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 05.05.2000 FI 20001058
27.02.2001 FI 20010384

(71) Applicant: UPM-Kymmene Corporation
00130 Helsinki (FI)

(72) Inventors:
  • TIRRI, Tapio
    FIN-90800 Oulu (FI)
  • DAHL, Olli
    FIN-91500 Muhos (FI)
  • TIENVIERI, Taisto
    FIN-37600 Valkeakoski (FI)
  • LEHTO, Jouko, H.
    FIN-53850 Lappeenranta (FI)

(74) Representative: Klusmann, Peter, Dr. 
Hoffmann - EitlePatent- und RechtsanwälteArabellastrasse 4
81925 München
81925 München (DE)

   


(54) METHOD AND APPARATUS FOR REGULATING A PEROXIDE BLEACHING PROCESS