EP 3122931 A1 20170201 - METHOD FOR THE MANUFACTURE OF BLEACHED WOOD FIBRE
Title (en)
METHOD FOR THE MANUFACTURE OF BLEACHED WOOD FIBRE
Title (de)
VERFAHREN ZUR HERSTELLUNG VON GEBLEICHTEM HOLZFASERSTOFF
Title (fr)
PROCÉDÉ DE FABRICATION DE FIBRE DE BOIS BLANCHIE
Publication
Application
Priority
- EP 14161583 A 20140325
- EP 2015055275 W 20150313
Abstract (en)
[origin: CA2943663A1] The invention relates to a method for producing bleached wood fibre material, comprising the following steps: a) delaminating wood particles, that are large and optionally pre-treated with chemicals and/or water, into modified wood particles; b) grinding the modified wood particles produced in step a) in one or a number of refiners; c) and optionally treating the material produced in step b) with oxidative or reductive bleaching agents. The method is characterised in that step a) and/or step b) are carried out in the presence of a composition Z, said composition Z containing one or a number of the following components (Z1) to (Z3): a salt of dithionous acid H2S2O4 (Z1); a compound (Z2) that generates the dithionous acid or a derivate of the dithionous acid; a salt of sulphurous acid (sulphite) plus sodium tetrahydridoborate (Z3); and optionally additives (Z4).
IPC 8 full level
D21C 9/10 (2006.01); D21B 1/04 (2006.01); D21B 1/06 (2006.01); D21B 1/12 (2006.01)
CPC (source: CN EP KR RU US)
D21B 1/021 (2013.01 - US); D21B 1/14 (2013.01 - US); D21C 9/1005 (2013.01 - CN EP KR RU US); D21C 9/1057 (2013.01 - CN EP KR RU US); D21C 9/1063 (2013.01 - CN EP KR RU US); D21C 9/1089 (2013.01 - CN EP KR RU US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 2924166 A1 20150930; AU 2015238642 A1 20161006; AU 2015238642 B2 20180712; BR 112016021939 A2 20170815; BR 112016021939 A8 20210504; BR 112016021939 B1 20220104; CA 2943663 A1 20151001; CA 2943663 C 20221004; CL 2016002398 A1 20170120; CN 106103842 A 20161109; CN 115198551 A 20221018; EP 3122931 A1 20170201; EP 3122931 B1 20191030; ES 2768924 T3 20200624; JP 2017510725 A 20170413; JP 6707460 B2 20200610; KR 102426606 B1 20220728; KR 20160136424 A 20161129; MX 2016012461 A 20170106; PL 3122931 T3 20200518; RU 2016141601 A 20180425; RU 2016141601 A3 20181018; RU 2689568 C2 20190528; SI 3122931 T1 20200228; US 11015290 B2 20210525; US 11725338 B2 20230815; US 2018216292 A1 20180802; US 2021254280 A1 20210819; WO 2015144455 A1 20151001; ZA 201607131 B 20180830
DOCDB simple family (application)
EP 14161583 A 20140325; AU 2015238642 A 20150313; BR 112016021939 A 20150313; CA 2943663 A 20150313; CL 2016002398 A 20160923; CN 201580013319 A 20150313; CN 202210863517 A 20150313; EP 15711458 A 20150313; EP 2015055275 W 20150313; ES 15711458 T 20150313; JP 2016558601 A 20150313; KR 20167029555 A 20150313; MX 2016012461 A 20150313; PL 15711458 T 20150313; RU 2016141601 A 20150313; SI 201531045 T 20150313; US 201515128755 A 20150313; US 202117307060 A 20210504; ZA 201607131 A 20161017