Global Patent Index - EP 1015682 A1

EP 1015682 A1 2000-07-05 - A METHOD FOR THE CONTROL OF A GROUNDWOOD PULPING PROCESS

Title (en)

A METHOD FOR THE CONTROL OF A GROUNDWOOD PULPING PROCESS

Title (de)

VERFAHREN ZUR STEUERUNG EINES HOLZAUFSCHLUSSVERFAHREN

Title (fr)

PROCEDE DE COMMANDE D'UNE OPERATION DE REDUCTION DE BOIS EN PATE MECANIQUE

Publication

EP 1015682 A1 (EN)

Application

EP 97928285 A

Priority

  • FI 9700406 W
  • FI 962626 A

Abstract (en)

[origin: WO9749857A1] The invention relates to a method for the control of a groundwood pulping process. According to the invention the drainability (freeness, CF) of the pulp and another quantity Q characterising the pulp quality are measured, whereby the quantity Q preferably is the tearing resistance (tear index RI), and the measured values CFx and Qx are compared with the set points CF0 and Q0 of the corresponding quantities. The wood supply rate Vn or the wood supply pressure Fn, and the grinding stone's peripheral speed Vp are adjusted so that the sum (CFx - CF0)<2> + (Qx - Q0)<2> obtains its minimum value.

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

D21B 1/18

IPC 8 full level (invention and additional information)

D21B 1/18 (2006.01); D21D 1/00 (2006.01)

CPC (invention and additional information)

D21B 1/18 (2013.01); D21D 1/002 (2013.01)

Citation (search report)

See references of WO 9749857A1

Designated contracting state (EPC)

DE SE

EPO simple patent family

WO 9749857 A1 19971231; CA 2294424 A1 19971231; DE 69718683 D1 20030227; EP 1015682 A1 20000705; EP 1015682 B1 20030122; FI 102975 B1 19990331; FI 102975 B 19990331; FI 962626 A0 19960625; FI 962626 A 19971226

INPADOC legal status


2004-01-14 [26N] NO OPPOSITION FILED

- Effective date: 20031023

2003-04-23 [PG25 DE] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

- Ref Country Code: DE

- Free text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

- Effective date: 20030423

2003-04-22 [PG25 SE] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

- Ref Country Code: SE

- Free text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

- Effective date: 20030422

2003-02-27 [REF] CORRESPONDS TO:

- Document: DE 69718683 P 20030227

2003-01-22 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: B1

- Designated State(s): DE SE

2000-07-05 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19990115

2000-07-05 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE SE