Global Patent Index - EP 0974799 A2

EP 0974799 A2 20000126 - Process for drying fibrous webs

Title (en)

Process for drying fibrous webs

Title (de)

Verfahren zur Trocknung von Faserstoffbahnen

Title (fr)

Procédé de séchage de bandes fibreuses


EP 0974799 A2 20000126 (DE)


EP 99105158 A 19990329


DE 19827843 A 19980623

Abstract (en)

To dry a wet fiber web (1), especially of paper or cardboard or tissue, it is heated, and the drying action is set across the web at least in sections at least during one phase of the heating process. The drying effect is varied at the center of the web (1), in relation to the edges, so that the blowing and/or heating is stronger at the center while the edges are moistened. The changing effects on the heating action are decreased towards the end of the drying process, across the web (1) width. The heating effect action is stronger and/or the strongest at the start of the heating program, and after the contained water has started to evaporate. The level of the heating effect is set by the difference between the shrinkage of the web (1) at the heating point and the shrinkage at the end of the drying process. An independent claim is included for an appts. where the web (1) is subjected to blowing and/or moistening and/or heating at a different intensity at least in sections, across the web (1) width.

Abstract (de)

Die Erfindung betrifft ein Verfahren zur Trocknung von Faserstoffbahnen, insbesondere Papier-, Karton- oder Tissuebahnen, bei dem die Faserstoffbahn aufgeheizt wird. Aufgabe der Erfindung ist es dabei ein Trocknungsverfahren zu schaffen, bei dem ein möglichst ebenes Querprofil des Flächengewichts selbst nach relativ kurzen Trocknungsvorgängen gewährleistet ist. Erreicht wird dies dadurch, daß zumindest während einer Phase des Trocknungsvorganges der Grad der Trocknung wenigstens abschnittsweise quer zur Faserstoffbahn (1) beeinflusst wird. <IMAGE>

IPC 1-7

F26B 13/00

IPC 8 full level

D21F 5/02 (2006.01); D21F 5/04 (2006.01); D21G 7/00 (2006.01); F26B 13/00 (2006.01)

CPC (source: EP)

D21F 5/021 (2013.01); D21F 5/042 (2013.01); D21G 7/00 (2013.01); F26B 13/008 (2013.01)

Designated contracting state (EPC)


DOCDB simple family (publication)

DE 19827843 A1 19991230; EP 0974799 A2 20000126; EP 0974799 A3 20011205

DOCDB simple family (application)

DE 19827843 A 19980623; EP 99105158 A 19990329