Device and method for producing a material web

Details Device and method for producing a material web Device and method for producing a material web

D - Textiles, Paper

21

F

D21F 3/02 (2006.01) D21F 11/00 (2006.01)

Patent

CA 2746488

The invention relates to a device (3) for drainage of a pulp web (10), particularly a tissue web, having a first pressing zone (15.1) having a pressing zone length of L1 through which the pulp web (10) is fed horizontally between a circulating, permeable band (8) and a circulating, permeable support band (9), wherein the first pressing zone (15.1) is designed such that a fluid can flow through the band (8), the pulp web (10) and the support band (9) at least on one part of the pressing zone length L1. In addition, the device has a subsequent second pressing zone (15.2) having a pressing zone length of L2. The invention is characterized in that the pulp web (10) is guided through the second pressing zone (15.2) between two bands (8, 9) having differing compressibility.

L'invention porte sur un dispositif (3) pour la déshydratation d'une bande de matière fibreuse (10), en particulier d'une bande de tissu mousseline, avec une première zone de compression (15.1), ayant une longueur L1 de zone de compression, à travers laquelle passe, en position horizontale, une bande de matière fibreuse (10) entre une bande perméable circulante (8) et une bande de soutien perméable circulante (9), la première zone de compression (15.1) étant configurée de façon que la bande (8), la bande (10) de matière fibreuse et la bande de soutien (9) puissent être mouillées par un fluide, au moins sur une partie de la longueur L1 de la zone de compression. En outre, le dispositif comprend une deuxième zone de compression (15.2), qui suit la première, et qui a une longueur L2 de zone de compression. L'invention se caractérise par le fait que la bande (10) de matière fibreuse passe à travers la deuxième zone de compression (15.2) entre deux bandes (8, 9) ayant des compressibilités différentes.

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