EP 1266074 B1 20061025 - METHOD FOR BLEACHING MECHANICAL AND CHEMITHERMOMECHANICAL PULP
Title (en)
METHOD FOR BLEACHING MECHANICAL AND CHEMITHERMOMECHANICAL PULP
Title (de)
VERFAHREN ZUM BLEICHEN VON HOLZSTOFF UND CHEMOTHERMOMECHANISCHER PULPE
Title (fr)
PROCEDE DE BLANCHIMENT DE PATES CELLULOSIQUES PAR VOIES MECANIQUES ET THERMOMECANOCHIMIQUES
Publication
Application
Priority
- SE 0100260 W 20010208
- SE 0000431 A 20000211
Abstract (en)
[origin: WO0159205A1] The present invention relates to a method for bleaching mechanical and chemithermomechanical pulp including that an advancing pulp suspension obtained after that the fibres are laid free is prebleached by adding reductive bleaching agent to the pulp suspension in a location just after the fibres are laid free and that the bleaching is carried out under given conditions in the form of high temperature and minimized oxygen access in respect of said adding location and immediately downstream of said location, characterized in, that the in the described manner prebleached pulp is subjected to at least one further bleaching treatment including that the pulp is bleached with an oxidizing bleaching agent, preferably peroxide bleaching agent, reinforced with borohydride.
IPC 8 full level
D21C 9/10 (2006.01); D21C 9/16 (2006.01); D21H 11/08 (2006.01)
CPC (source: EP US)
D21C 9/163 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
WO 0159205 A1 20010816; AT E343674 T1 20061115; CA 2395824 A1 20010816; DE 60124081 D1 20061207; DE 60124081 T2 20070606; EP 1266074 A1 20021218; EP 1266074 B1 20061025; ES 2269348 T3 20070401; JP 2003522846 A 20030729; SE 0000431 D0 20000211; SE 0000431 L 20010812; SE 515708 C2 20011001; US 2003121625 A1 20030703
DOCDB simple family (application)
SE 0100260 W 20010208; AT 01906451 T 20010208; CA 2395824 A 20010208; DE 60124081 T 20010208; EP 01906451 A 20010208; ES 01906451 T 20010208; JP 2001558530 A 20010208; SE 0000431 A 20000211; US 20320202 A 20021118