Patent ID: 6214167
Filing Date: 2001-04-10
Classification: D21F

Abstract:
A twin-wire former for producing a fibrous material web from a fibrous suspension, comprising:a twin-wire zone composed of a lower wire and an upper wire;a plurality of rolls comprising an inlet roll and an outlet roll;the upper wire being guidable over the plurality of rolls, wherein the inlet roll is adapted to guide the upper wire to the twin-wire zone and the outlet roll is adapted to guide the upper wire toward the inlet roll;a wedge-shaped inlet zone to the twin-wire zone being formed between the upper wire and the lower wire and having an adjustable inlet wedge angle;an upper wire subassembly including a drainage box adapted to receive suspension water that flows upwardly through the upper wire, and further including a pivotable common support device, to which the drainage box and the inlet roll are mounted;a stroke device coupled to the pivotable common support device to lift the pivotable common support device around a first horizontal axle, whereby the inlet wedge angle is varied during former operation, wherein, after a maximal inlet wedge angle is formed, continued lifting of the pivotable common support device by the stroke device causes the upper wire subassembly to lift up from the lower wire, thereby separating the upper wire from the lower wire; anda second horizontal pivot axle associated with the upper wire subassembly and located in a region of the outlet roll, wherein the separating of the upper and lower wires occurs around the second horizontal pivot axle.