Device and method for drying fibrous material
AssigneeAndritz Inc.
InventorsFranz Petschauer, Stefan Hansen, Klaus Poeschl
Life of this patent
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Abstract
A method for dewatering a fibrous material web, wherein fibrous material is applied via a headbox on at least one wire and is subsequently dewatered in order to form a fibrous material web. Following the wire section, the resulting fibrous material web is dewatered by several presses, wherein the first press through which the fibrous material web is guided following the headbox is equipped with a double nip. The first press is formed by a wire roll and two couch rolls which are each pressed against the wire roll for forming a nip. Also disclosed is a corresponding device for carrying out the method.
Claims6
A method for dewatering a fibrous web, comprising:
- introducing a fibrous material for the formation of a fibrous web into a headbox between two wire conveyors and being dewatered, and, following the wire section,
- guiding the fibrous web through a plurality of presses and being dewatered, wherein the first press, through which the fibrous web is guided after the headbox, is equipped with a first and a second nip, the first press is formed by a wire roll and by two couch rolls which are in each case pressed against the wire roll in order to form the first and second nips, the wire roll being wrapped around by a wire conveyor and the couch rolls being wrapped around in each case by a common felt, and
- separating the common felt from the fibrous web in a region between the first and second nips, and
- dewatering the felt in the separated region between the first and second nips by way of a tubular suction device.
A device for dewatering a fibrous web, comprising:
- a headbox,
- a wire section comprising two wire conveyors,
- at least one first press, through which the fibrous web is guided, being arranged downstream of the wire section,
- wherein the first press comprises a first and a second nip, formed by a wire roll and by two couch rolls which are in each case pressed against the wire roll in order to form a nip, the wire roll being wrapped around by a wire conveyor, and the couch rolls being wrapped around in each case by a common felt, guide rolls supporting the common felt separated from the fibrous web in a region between the first and the second nip, and
- a tubular suction device arranged between the first and the second nip for sucking the felt to dryness while the felt is separated from the fibrous web.
Dependencies are inferred from the claim text.