Extended nip press apparatus
AssigneeOccendo AB
InventorTomas Anderson
Life of this patent
Estimating the term…
Abstract
An extended nip press apparatus (1) for removing water from a web (20), comprising a rotatable backing roll (2), an elongated press device (3, 30) cooperating with the backing roll for defining between the elongated press device (3, 30) and the backing roll (2) an extended nip (4). The elongated press device is provided with a perforated belt (5, 50). A moveable, permeable carrying medium (6a) is arranged to be passed through the extended nip, and to support on a surface thereof a web 20. A mechanical pressure is created between the backing roll (2) and the elongated press device in the extended nip, and a vacuum is applied to the extended nip through the elongated press device, thereby both a mechanical pressure and a vacuum is applied to a web (20) being passed through the extended nip (4) on the carrying medium (6a).
Claims15
An extended nip press apparatus for removing water from a web, the apparatus comprising:
- a rotatable backing roll,
- an elongated press device cooperating with said backing roll for defining between the elongated press device and the backing roll an extended nip, wherein the elongated press device is provided with a belt provided with perforations,
- a moveable, permeable carrying medium arranged to be passed through said extended nip, the carrying medium being arranged to support on a surface thereof a web, such that the carrying medium is arranged between the web and the perforated belt of the elongated press device in the extended nip,
- an arrangement for creating a mechanical pressure between the backing roll and the elongated press device in the extended nip, and
- a device for applying a vacuum to the extended nip through the elongated press device, thereby applying both a mechanical pressure and a vacuum to a web being passed through the extended nip on the carrying medium.
A method for dewatering a web, comprising:
- arranging a rotatable backing roll and an elongated press device such that an extended nip is defined between the elongated press device and the backing roll,
- providing the elongated press device with a belt provided with perforations,
- arranging a moveable, permeable carrying medium for passage through the extended nip,
- arranging a web on a surface of said permeable carrying medium, such that that the permeable carrying medium is arranged between the web and the perforated belt of the elongated press device in the extended nip,
- moving the carrying medium and the web arranged on a surface thereon through the extended nip,
- applying a mechanical nip pressure to the web when passing through the extended nip,
- applying a vacuum to the extended nip through the elongated press device, thereby applying a vacuum to the web when passing through the extended nip.
Dependencies are inferred from the claim text.