Title (en)

Method and device for dewatering of a paper web by pressing.

Title (de)

Verfahren und Vorrichtung zur Entwässerung einer Papierbahn durch Pressen.

Title (fr)

Procédure et disposition pour drainage d'une bande de papier par pressage.

Publication

EP 0487483 A1 19920527 (EN)

Application

EP 91850291 A 19911122

Priority

FI 905798 A 19901123

Abstract (en)

Method and device in the manufacture of paper or board for dewatering of the paper web (W) that is being manufactured. The paper web (W) is transferred from the forming wire (10) onto the wire (80) in the drying section while constantly on support of a fabric that receives water, a transfer fabric, or of any other, corresponding transfer surface (105 min ) as a closed draw, at a particularly high speed, which is, as a rule, higher than about 25...30 m/s. Dewatering of the paper web (W) is carried out by means of at least two subsequent press nips (N,NP), of which nips at least one press nip is a so-called extended-nip zone, whose length (z) in the machine direction is larger than z > about 100 mm. The extended-nip zone (NP) is formed in connection with a mobile flexible press-band loop (201; 301). The distribution of the compression pressure employed within said extended-nip press zone (NP) is regulated and/or selected both in the transverse direction of the web (W) and in the machine direction so as to set or to control the different profiles of properties of the web. <IMAGE>

IPC 1-7

D21F 3/04

IPC 8 full level

D21F 3/02 (2006.01); D21F 3/04 (2006.01)

CPC (source: EP)

D21F 3/0218 (2013.01); D21F 3/04 (2013.01); D21F 3/045 (2013.01)

Citation (search report)

• [XD] WO 8500841 A1 19850228 - VOITH GMBH J M [DE]
• [XD] US 4483745 A 19841120 - WICKS LAURIE D [US], et al
• [X] WO 8808051 A1 19881020 - VOITH GMBH J M [DE]
• [X] GB 2218122 A 19891108 - VOITH GMBH J M [DE]
• [XP] WO 9108339 A1 19910613 - BELOIT CORP [US]
• [AD] DE 3604522 A1 19860904 - VALMET OY [FI]
• [AD] DE 3515575 A1 19851128 - VALMET OY [FI]
• [AD] DE 3742848 A1 19890629 - ESCHER WYSS GMBH [DE]
• [AD] US 4561939 A 19851231 - JUSTUS EDGAR J [US]
• [AD] DE 3515576 A1 19851128 - VALMET OY [FI]
• [AD] US 4526655 A 19850702 - KARVINEN MIKKO [FI], et al
• [AD] FI 66932 B 19840831 - VALMET OY [FI]
• [AD] US 4584059 A 19860422 - SCHIEL CHRISTIAN [DE], et al
• [AD] EP 0389458 A2 19900926 - VALMET PAPER MACHINERY INC [FI]
• [AD] EP 0345500 A1 19891213 - VALMET PAPER MACHINERY INC [FI]
• [AD] EP 0345501 B1 19921119

Designated contracting state (EPC)

AT DE FR GB IT SE

DOCDB simple family (publication)

EP 0487483 A1 19920527; EP 0487483 B1 19980715; AT E168423 T1 19980815; AT E218648 T1 20020615; CA 2055927 A1 19920524; CA 2055927 C 19990202; DE 69129788 D1 19980820; DE 69129788 T2 19981119; DE 69133030 D1 20020711; DE 69133030 T2 20021121; EP 0770727 A1 19970502; EP 0770727 B1 20020605; FI 905798 A0 19901123; FI 905798 A 19920524; FI 96789 B 19960515; FI 96789 C 19960826

DOCDB simple family (application)

EP 91850291 A 19911122; AT 91850291 T 19911122; AT 96120948 T 19911122; CA 2055927 A 19911120; DE 69129788 T 19911122; DE 69133030 T 19911122; EP 96120948 A 19911122; FI 905798 A 19901123