Patent ID: 6942761
Filing Date: 2005-09-13
Classification: D21F,D21G

Abstract:
1. A press device for treating a fibrous material web comprising: a shoe press unit, said shoe press unit comprising a flexible press belt that revolves around a non-rotating carrier; a counter roll, said counter roll comprising a deflection compensation roll with a roll jacket revolving around a second non-rotating carrier; a third roll; a roll nip, said roll nip formed between said counter roll and said third roll; a press nip, said press nip elongated in a web travel direction, and formed between said shoe press unit and said counter roll; at least one first support element being pressure fluid-actuated, the flexible press belt supported on the non-rotating carrier by said at least one first support element in the region of the elongated press nip; at least one second support element being pressure fluid-actuated, the roll jacket supported on the second non-rotating carrier by said at least one second support element in the region of the elongated press nip, a pressure fluid line arranged to generate internal pressures by the at least one first support element on the flexible press belt of the shoe press unit and by the at least one second support element on the roll jacket of the counter roll; an adjustment device arranged to change a pressure differential between the internal pressures generated by the at least one first support element acting on the flexible press belt of the shoe press unit, and the at least one second support element acting on the roll jacket of the counter roll, said adjustment device being structured and arranged to adjust the pressure differential as at least one of a function of a line force in the roll nip by predeterminable characteristic curves, and a function of line force correction procedures for the roll nip; and an electronic control coupled to the adjustment device, whereby the electronic control and the adjustment device adjust the pressure differential, wherein the line force correction procedures are at least one of input by way of the electronic control and produced by way of corresponding signals of a process guidance system, and wherein adjustment of the pressure differential provides cross-section corrections in the roll nip.