Voith Sulzer Papiertechnik Patent Gmbh

Voith Paper Patent Gmbh

Alexander Wassermann

G&uuml;nter Halmschlager

Franz Stelzhammer

Erich Brunnauer

Manfred Feichtiger

Volker Schmidt-Rohr

Werner Leitenberger

Udo Grossmann

Thomas Elenz

Guenter Halmschlager

J&uuml;rgen Banning

Thomas Nagler

Eduard Bachler

Helmut Tausel

G&uuml;nther Prinz

James Ronning

A fibrous web including a back liner having a higher fines side with a higher fines content, a top liner having a higher fines side with a higher fines content and at least one middle layer having a higher fines side with a higher fines content, and a lower fines side with a lower fines content, at least one middle layer and the top liner being couched together, the back liner having the higher fines side in contact with the lower fines side of at least one middle layer.

Multi-ply fibrous plasterboard web

A machine for the manufacture of a multi-layer fibrous web includes at least two fibrous web layers and at least two formers; the fibrous web layers each having a lower fines side with a lower fines content and a higher fines side with a higher fines content; and the formers include a first former and a second former, at least one of the two formers being a gap former, with the second former including a couch roll defining a couching zone whereat the lower fines side of the first fibrous web layer is brought into contact with the lower fines side of the second fibrous web layer.

Machine for the manufacture of a multi-layer fibrous web

Process for homogenizing the property cross direction profile of a continuous web made of paper or cardboard and a paper machine that is suitable for carrying out the above-mentioned process. The process is characterized in that the shrinkage cross direction profile of the material web is homogenized during its manufacturing process by controlling the local composition of the stock suspension sectionally across the width by changing the proportions of components that have different shrinkage behaviors. The paper machine includes an approach flow system having at least two regions that produce different stock suspensions with fiber mixtures that have different shrinkage behaviors. The stock suspension supplies from the approach flow system to the headbox have at least two branches for the at least two different stock suspensions. Near the headbox, a plurality of sectional mixing points are provided, which combine the stock suspensions that have different shrinkage behaviors. Paper is produced from the process and device.

Process for improving the shrinkage cross direction profile and paper having an improved cross

Twin wire former and method for manufacturing a fibrous material web from a fibrous suspension using same. The twin wire former comprises a movable bottom wire belt and a movable top wire belt converging at a twin wire zone. The twin wire zone has a first section, a second section and an end section. A rotating forming roller is disposed at the first section of the twin wire zone, and the to wire and the bottom wire form a wedge-shaped inlet gap at the first section of the twin wire zone. The inlet gap is adapted to receive the fibrous suspension from a headbox. The bottom wire belt and the top wire belt are adapted to form the fibrous web therebetween at the second section of the twin wire zone, and the second section of the twin wire zone has at least one drainage element. A separating device is disposed at the end of the twin wire zone and is adapted to separate one wire belt from another the wire belt. The twin wire zone has a section disposed in a steep downward direction downstream of the forming roller in relation to the movement of the wires. Also disclosed is a method for manufacturing a fibrous material web from a fibrous suspension using a twin wire former.

Twin wire former and method of manufacturing a fibrous material web from a fibrous suspension using same

Twin-wire former for producing a fibrous material web from a fibrous suspension and process for separating upper and lower wires of the twin-wire former. The twin-wire former includes a twin-wire zone composed of a lower wire and an upper wire and a plurality of rolls including an inlet roll and an outlet roll. The upper wire is guidable over the plurality of rolls, the inlet roll guides the upper wire to the twin-wire zone, and the outlet roll guides the upper wire toward the inlet roll. A wedge-shaped inlet zone is formed between the upper wire and the lower wire and has an adjustable inlet wedge angle. An upper wire subassembly includes a drainage box adapted to receive suspension water that flows upwardly through the upper wire, and further includes a pivotable common support device, to which the drainage box and the inlet roll are mounted. A stroke device is coupled to the pivotable common support device to lift the pivotable common support device around a first horizontal axle. In this manner, the inlet wedge angle is varied during former operation. 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. A second horizontal pivot axle associated with the upper wire subassembly and located in a region of the outlet roll is provided. The separating of the upper and lower wires occurs around the second horizontal pivot axle. The process includes lifting the common support device with the stroke device, such that the common support device is pivotably supported by the first horizontal axle and the inlet wedge angle is increased, and, upon maximally increasing the inlet wedge angle, further lifting the common support device with the stroke device, such that the common support device is pivotably supported by the second horizontal axle and is disengaged from the first horizontal axle. In this manner, the upper wire is lifted up from the lower wire.

Twin-wire former and process for separating upper and lower wires of HTE twin-wire former

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Vienna, Austria

Alexander Wassermann