EP 1813721 B1 20081203 - Method and equipment for forming of a paper or board web
Title (en)
Method and equipment for forming of a paper or board web
Title (de)
Verfahren und Vorrichtung zur Bildung einer Papier- oder Kartonbahn
Title (fr)
Procédé et équipement de formation d'une bande de papier ou de carton
Publication
Application
Priority
FI 20065056 A 20060127
Abstract (en)
[origin: EP1813721A1] Method and equipment for the forming of a paper or board web. The headbox (17) is sealed in relation to the wires (11, 12) so that the pulp suspension is transferred from the headbox (17) to the forming zone as a closed jet without free boundary surfaces. The forming zone comprises the first dewatering element (23), which is located inside the first wire loop (11), and the second dewatering element (24), which is located inside the second wire loop (12), so that between them, they provide the borders for the initial dewatering zone which narrows in the flow direction. In the initial dewatering zone, water is removed from the pulp suspension through the openings (26, 27) in the cover of the dewatering elements (23, 24). After the initial dewatering zone, the wires (11, 12) are led over the curved cover of the forming shoe (29) while at the same time pressure pulses are exerted on the pulp suspension located between the wires (11, 12) by means of dewatering blades (28) located on the cover of the forming shoe (29). The length (L 0 ) of the initial dewatering zone bordered by the dewatering elements (23, 24) is at the most 50 % of the length (L 1 ) of the forming shoe (29) following it.
IPC 8 full level
CPC (source: EP FI)
D21F 1/00 (2013.01 - FI); D21F 1/02 (2013.01 - EP); D21F 1/028 (2013.01 - EP); D21F 9/003 (2013.01 - EP)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 1813721 A1 20070801; EP 1813721 B1 20081203; AT E416274 T1 20081215; DE 602006003992 D1 20090115; FI 120457 B 20091030; FI 20065056 A0 20060127; FI 20065056 A 20070728
DOCDB simple family (application)
EP 06126500 A 20061219; AT 06126500 T 20061219; DE 602006003992 T 20061219; FI 20065056 A 20060127