Press section and permeable belt in a paper machine
AssigneeVoith Patent GmbH
InventorsThomas Thoröe Scherb, Hubert Walkenhaus, Jeffrey Herman, Luiz Carlos Silva
Life of this patent
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Abstract
A belt press for a paper machine, the belt press including a roll having an exterior surface and a permeable belt. The permeable belt has a first side and is guided over a portion of the exterior surface of the roll. The permeable belt has a tension of at least approximately 30 KN/m, the first side has an open area of at least approximately 25% and a contact area of at least approximately 10%.
Claims111
A belt press for a paper machine, the belt press comprising:
- a roll having an exterior surface;
- a permeable belt having a first side and being guided over a portion of said exterior surface of said roll, said permeable belt having a tension of at least approximately 30 KN/m, said first side having an open area of at least approximately 25% and a contact area of at least approximately 10%.
A fibrous material drying arrangement comprising:
- a roll;
- and
- an endlessly circulating permeable extended nip press (ENP) belt guided over said roll, said ENP belt being subjected to a tension of at least approximately 30 KN/m, said ENP belt having a side with an open area of at least approximately 25% and a contact area of at least approximately 10%.
A permeable extended nip press (ENP) belt which is capable of being subjected to a tension of at least approximately 30 KN/m, the permeable ENP belt comprising:
- at least one side having an open area of at least approximately 25% and a contact area of at least approximately 10%.
A method of subjecting a fibrous web to pressing in a paper machine, the method comprising the steps of:
- applying pressure against a contact area of the fibrous web with a portion of a permeable belt, wherein the contact area is at least approximately 10% of an area of said portion;
- and moving a fluid through an open area of said permeable belt and through the fibrous web, wherein said open area is at least approximately 25% of said portion, wherein, during the applying and the moving steps said permeable belt has a tension of at least approximately 30 KN/m.
A method of pressing a fibrous web in a paper machine, the method comprising the steps of:
- applying a first pressure against first portions of the fibrous web with a permeable belt and a second greater pressure against second portions of the fibrous web with a pressing portion of said permeable belt, wherein an area of said second portions is at least approximately 10% of an area of said first portions;
- and
- moving air through open portions of said permeable belt, said open portions being at least approximately 25% of the pressing portion of said permeable belt which applies said first and second pressures, during said applying and said moving steps said permeable belt has a tension of at least approximately 30 KN/m.
A method of drying a fibrous web in a belt press which includes a roll and a permeable belt having through openings, wherein an area of the through openings of a pressing portion of the permeable belt is at least approximately 25% of an area of the pressing portion, and wherein the permeable belt is tensioned to at least approximately 30 KN/m, the method comprising the steps of:
- guiding at least the pressing portion of the permeable belt over the roll;
- moving the fibrous web between the roll and the pressing portion of the permeable belt;
- subjecting at least approximately 10% of the fibrous web to a pressure produced by portions of the permeable belt which are adjacent to the through openings;
- and
- moving a fluid through the through openings of the permeable belt and the fibrous web.
A belt press for a paper machine, the belt press comprising:
- a vacuum roll having an exterior surface and at least one suction zone;
- a permeable belt having a first side and being guided over a portion of said exterior surface of said vacuum roll, said permeable belt having a tension of at least approximately 30 KN/m, said first side having an open area of at least approximately 25% and a contact area of at least approximately 10%.
Dependencies are inferred from the claim text.