Global Patent Index - EP 0884415 B1

EP 0884415 B1 2002-11-20 - Method of washing pulp in connection with bleaching

Title (en)

Method of washing pulp in connection with bleaching

Title (de)

Verfahren zum Waschen von Zellstoff beim Bleichen

Title (fr)

Procédé pour le lavage de pâte à papier pendant le blanchiment

Publication

EP 0884415 B1 (EN)

Application

EP 98113684 A

Priority

  • EP 93910051 A
  • FI 930954 A

Abstract (en)

[origin: WO9420673A1] Kraft pulp is bleached to an acceptable brightness (e.g. 86 ISO or more) without using chlorinated organic compounds, yet the strength of the produced pulp remains commercially acceptable. In the manufacture of pulp, the pulp which is cooked and oxygen delignified to a kappa number of 14 or less, and then is bleached with ozone at a medium consistency. After the ozone treatment, heavy metals are removed from the pulp, and then the pulp is led to oxygen and/or peroxide treatment, which is followed by a second ozone bleaching stage. The sequence (ZT) (EOP) (ZP) is preferred.

IPC 1-7 (main, further and additional classification)

D21C 9/02; D21C 9/10

IPC 8 full level (invention and additional information)

D21C 9/02 (2006.01); D21C 9/10 (2006.01); D21C 9/147 (2006.01); D21C 9/153 (2006.01); D21C 9/16 (2006.01)

IPC 8 main group level (invention and additional information)

D21C (2006.01)

CPC (invention and additional information)

D21C 9/1026 (2013.01); D21C 9/02 (2013.01); D21C 9/1036 (2013.01); D21C 9/1042 (2013.01); D21C 9/1057 (2013.01); D21C 9/147 (2013.01); D21C 9/153 (2013.01); D21C 9/163 (2013.01)

Designated contracting state (EPC)

AT DE ES FR PT SE

EPO simple patent family

WO 9420673 A1 19940915; AT 176808 T 19990315; AT 228181 T 20021215; AU 5370594 A 19940926; BR 9307858 A 19960227; CA 2157109 A1 19940915; CA 2157109 C 20020903; DE 69323566 D1 19990325; DE 69323566 T2 19990715; DE 69332508 D1 20030102; DE 69332508 T2 20030703; EP 0687321 A1 19951220; EP 0687321 B1 19990217; EP 0884415 A1 19981216; EP 0884415 B1 20021120; ES 2130260 T3 19990701; ES 2186948 T3 20030516; FI 930954 A0 19930303; FI 930954 A 19940904; FI 93232 B 19941130; FI 93232 C 19950310; FI 934036 A0 19930915; FI 934036 A 19940904; FI 954093 A0 19950830; FI 954093 A 19951017; FI 98223 B 19970131; JP 3276083 B2 20020422; JP H08509781 A 19961015; NO 953444 A 19951019; NO 953444 D0 19950901; PT 884415 E 20030331; RU 2126471 C1 19990220

INPADOC legal status


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2003-03-21 [ET] FR: TRANSLATION FILED

2003-01-02 [REF] CORRESPONDS TO:

- Document: DE 69332508 20030102

2002-11-20 [AC] DIVISIONAL APPLICATION (ART. 76) OF:

- Document: EP 687321

2002-11-20 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: B1

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2002-11-20 [PG25 AT] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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2002-11-20 [REF] CORRESPONDS TO:

- Document: AT 228181 T 20021215

2002-05-02 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: ANDRITZ OY

2002-01-02 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: ANDRITZ-AHLSTROM OY

2001-06-13 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20010502

1999-01-27 [RIN1] INVENTOR (CORRECTION)

- Inventor name: HENRICSON, KAJ

1999-01-27 [RIN1] INVENTOR (CORRECTION)

- Inventor name: STROMBERG, BERTIL

1998-12-16 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19980722

1998-12-16 [AC] DIVISIONAL APPLICATION (ART. 76) OF:

- Document: EP 687321

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- Kind Code of Ref Document: A1

- Designated State(s): AT DE ES FR PT SE