EP 0669999 A1 19950906 - METHOD OF BLEACHING PULP.
Title (en)
METHOD OF BLEACHING PULP.
Title (de)
VERFAHREN ZUM BLEICHEN VON ZELLSTOFF.
Title (fr)
PROCEDE DE BLANCHIMENT DE PATE DE CELLULOSE.
Publication
Application
Priority
- FI 9300362 W 19930914
- FI 925159 A 19921113
Abstract (en)
[origin: WO9411568A1] The present invention relates to a method for bleaching pulp and especially to novel types of pro-environmental bleaching processes used in the wood-processing industry, in which methods the chlorine chemicals have been replaced by other bleaching chemicals involving discharges less harmful to the environment. It is a characteristic feature of the invention that bleaching comprises at least two peroxide stages between which stages the fibers are subjected to an activating treatment, for example, acidation or hot alkali extraction.
IPC 1-7
IPC 8 full level
D21C 9/10 (2006.01); D21C 9/153 (2006.01); D21C 9/16 (2006.01)
CPC (source: EP)
D21C 9/1057 (2013.01); D21C 9/153 (2013.01); D21C 9/163 (2013.01)
Citation (search report)
See references of WO 9411568A1
Designated contracting state (EPC)
SE
DOCDB simple family (publication)
WO 9411568 A1 19940526; BR 9307443 A 19990601; CA 2149332 A1 19940526; EP 0669999 A1 19950906; FI 925159 A0 19921113; JP H08503267 A 19960409
DOCDB simple family (application)
FI 9300362 W 19930914; BR 9307443 A 19930914; CA 2149332 A 19930914; EP 93919365 A 19930914; FI 925159 A 19921113; JP 51173494 A 19930914