Method and device for controlling a wire in a forming gap of a w

Details Method and device for controlling a wire in a forming gap of a w Method and device for controlling a wire in a forming gap of a w

1993-12-08

1996-01-02

Hastings, Karen M.

Paper making and fiber liberation

Processes and products

Running or indefinite length work forming and/or treating...

162256, 162273, 162301, D21F 100

Patent

active

054805139

ABSTRACT:
Method and device for controlling a wire in the forming gap of a twin-wire web former of a paper machine, which gap is defined between two opposite forming wires. A pulp suspension jet is fed out of the discharge opening of the headbox of the paper machine into the forming gap. The jet has a free flight distance before it meets the forming wires. In the area of the forming gap, a variable-crown or adjustable-crown breast roll is employed as the breast roll of at least one of the wires. The deflection of the mantle of this breast roll is regulated actively from inside the mantle of the breast roll. In this manner, the transverse tightness profile of the wire guided by the breast roll and/or possible instabilities of the wire is/are controlled in particular in the area of the forming gap.

REFERENCES:
patent: 3440136 (1969-04-01), Nelson et al.
patent: 4925531 (1990-05-01), Koski
patent: 5084138 (1992-01-01), Ewald
patent: 5252186 (1993-10-01), Sollinger et al.

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