Voith Sulzer Papiertechnik Patent Gmbh

Voith Paper Patent Gmbh

Franz Stelzhammer

G&uuml;nter Halmschlager

Alfred Bubik

Alexander Wassermann

Jürgen Prössl

Volker Schmidt-Rohr

Werner Leitenberger

Joachim Henssler

Christoph Haase

Thomas Elenz

R&uuml;diger Keinberger

Peter Haider

J&uuml;rgen Banning

Erich Brunnauer

Helmut Tausel

G&uuml;nther Prinz

Joachim Hennssler

James Ronning

Rudolf Simmel

Johann Leitner

Twin-wire former for producing a fibrous web. The former includes two endless wire belts arranged to form a twin-wire zone, a dewatering element, and a headbox positioned at an angle relative to an imaginary first horizontal plane. The twin-wire zone includes a first section in which the two wire belts are arranged to run over the dewatering element. The two wire belts are further positioned to form a wedge-like inlet gap that is structured and arranged to receive a fibrous stock suspension directly from the headbox. Additional dewatering elements are utilized. The twin-wire zone includes a second section in which the two wire belts along with the fibrous web formed between the two wire belts are arranged to run downward over the additional dewatering elements. This Abstract is not intended to define the invention disclosed in the specification, nor intended to limit the scope of the invention in any way.

Twin wire former

The invention relates to a twin wire former () for producing a fibrous web (), in particular a paper, cardboard or tissue web, from a fibrous suspension according to the generic terms of claim 1. The twin wire former () is characterized in that, the two wire belts () run upwards after a passing a first deviation device (), forming an angle (&#x3b2;) relative to an imaginary second horizontal plane (H), in such a way that the upper vertex (.SO) of the second deviation device () lies above the lower vertex (.SU) of the first deviation device (), and that the angle (&#x3b4;) relative to the imaginary first plane (H) runs downwards.

The arrangement is for use within a machine for at least one of making and processing at least one of paper, cardboard and tissue. The arrangement includes a first unit, a support piece and at least one clamping device. A first unit has a shaped part together with a wear part, the shaped part having a part underside. The part underside has an underside length, the shaped part displaying a part contour upon the part underside along substantially all of the underside length. A support piece interlocks with the shaped part, the support piece having a support piece top and a corresponding top length. The support piece has a piece contour upon the support piece top along substantially all of the top length, the piece contour being substantially complimentary to the part contour. At least one clamping device is operatively positioned relative to both the part contour and the piece contour.

Method and arrangement for attaching at least one shaped part together with a wear part onto a support piece

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

Suction device and process for at least one of conditioning and drainage of an endless felt. The device includes a housing having at least one vacuum chamber, and a plurality of suction slits located on a suction surface of the housing that is adapted to face the endless felt. The plurality of suction slits are oriented to extend at least one of in and obliquely to a travel direction of the endless felt. The process includes guiding the endless belt over a suction surface of a vacuum chamber, and suctioning a surface of the endless belt with a plurality of suction slits located in the suction surface of the vacuum chamber. The plurality of suction slits extend in a direction that is at least one of in and oblique to a belt travel direction.

Suction device and process for conditioning and/or drainage of an endless felt

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

Growing community of inventors

Böheimkirchen, Austria

Franz Stelzhammer