EP 0276608 B1 19910327 - PROCESS FOR TREATING A PAPER SLURRY WITH OZONE
Title (en)
PROCESS FOR TREATING A PAPER SLURRY WITH OZONE
Publication
Application
Priority
FR 8618447 A 19861231
Abstract (en)
[origin: WO8805095A1] Method for treating with ozone a high yield finished pulp, that is to say a previously refined and purified pulp up to a refining degree required for its final utilization. The treatment is carried out in a reactor (1) consisting of a dual-screw machine, known per se, comprising inside a sleeve (7), two screws (3, 5) with parallel axes which are intermeshed and driven in the same rotational direction, and of which the helical threads present successive zones (10, 20, 30, 40) with different pitches. The pulp is introduced into the reactor at a high dryness level, preferably between 40 and 45 %. The ozone ratio may be from 2 % to 8 %. It is possible to continuously and simply obtain by implementing this method a high yield pulp having improved mechanical resistance properties.
IPC 1-7
IPC 8 full level
D21B 1/16 (2006.01); D21B 1/30 (2006.01); D21C 9/153 (2006.01)
CPC (source: EP)
B30B 11/243 (2013.01); B30B 11/246 (2013.01); D21B 1/16 (2013.01); D21B 1/30 (2013.01); D21C 9/153 (2013.01)
Designated contracting state (EPC)
BE CH DE ES FR GB IT LI LU NL SE
DOCDB simple family (publication)
FR 2609067 A1 19880701; FR 2609067 B1 19900615; CA 1326942 C 19940215; DE 3768936 D1 19910502; EP 0276608 A1 19880803; EP 0276608 B1 19910327; ES 2021083 B3 19911016; JP 2547246 B2 19961023; JP H01501805 A 19890622; NO 883795 D0 19880825; NO 883795 L 19880825; PT 86482 A 19880101; PT 86482 B 19901120; WO 8805095 A1 19880714
DOCDB simple family (application)
FR 8618447 A 19861231; CA 554413 A 19871215; DE 3768936 T 19871222; EP 87402949 A 19871222; ES 87402949 T 19871222; FR 8700510 W 19871223; JP 50083888 A 19871223; NO 883795 A 19880825; PT 8648287 A 19871230