Press section and permeable belt in a paper machine
AssigneeVoith Patent GmbH
InventorsJeffrey Herman, Thomas Thoroee Scherb, Luiz Carlos Silva, Hubert Walkenhaus
Life of this patent
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Abstract
A permeable belt, a belt press including a roll having an exterior surface and the permeable belt, and a method of drying or pressing a web with the permeable belt. The permeable belt can be tensioned to at least 30 KN/m. A side of the permeable belt has an open area of at least approximately 25% and a contact area of at least approximately 25%. 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.
Claims114
A belt press for a paper machine, the belt press comprising:
- a roll comprising an exterior surface;
- a permeable belt comprising 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% a contact area of at least approximately 10%;
- and
- a pressing device pressing said permeable belt towards the roll.
A fibrous material drying arrangement comprising:
- an endlessly circulating permeable extended nip press (ENP) belt guided over a roll;
- said ENP belt being subjected to a tension of at least approximately 30 KN/m;
- said ENP belt comprising a side having an open area of at least approximately 25% and a contact area of at least approximately 10%;
- and
- a perforated pressing device pressing said ENP belt towards the roll.
A belt press in combination with a permeable extended nip press (ENP) belt which is capable of being subjected to a tension of at least approximately 30 KN/m, said permeable ENP belt comprising:
- at least one side comprising an open area of at least approximately 25% and a contact area of at least approximately 10%;
- and
- forming a nip with a moving permeable support surface,
- wherein an upper fabric, a lower fabric and a web arranged between the upper and lower fabrics passes through the nip, and
- wherein one of:
- the upper fabric has lower compressibility than the lower fabric;
- and
- air flow through the web is 150 cubic-meters per meter of machine width.
A method of subjecting a fibrous web to pressing in a paper machine, the method comprising:
- applying pressure against a contact area of the fibrous web using a pressing surface pressing against a portion of a permeable belt, wherein the contact area is at least approximately 25% 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, said permeable belt has a tension of at least approximately 30 KN/m, and
- wherein the pressing surface is one of:
- arranged on a roll;
- perforated;
- straight or planar;
- and
- inwardly curved.
A method of pressing a fibrous web in a paper machine, the method comprising:
- arranging a pressing device inside an endless permeable belt;
- applying a first pressure against first portions of the fibrous web with the permeable belt and a second greater pressure against second portions of the fibrous web with a pressing portion of the permeable belt, wherein an area of the second portions is at least approximately 25% of an area of the first portions;
- and
- moving air through open portions of said permeable belt, wherein an area of the open portions is at least approximately 25% of the pressing portion of the permeable belt which applies the first and second pressures,
- wherein, during the applying and the moving, 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 comprising 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:
- applying a pressing force against the permeable belt via a pressing surface;
- 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,
- wherein the pressing surface is one of:
- arranged on a roll;
- perforated;
- straight or planar;
- and
- inwardly curved.
A belt press for a paper machine, the belt press comprising:
- a vacuum roll comprising an exterior surface and at least one suction zone;
- a permeable belt comprising 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;
- and
- said first side having an open area of at least approximately 25% a contact area of at least approximately 10%;
- and
- a pressing device applying a pressing force against said permeable belt,
- wherein the pressing device one of:
- is a roll;
- and
- comprises a perforated pressing surface.
A belt press for a paper machine, the belt press comprising:
- a supporting structure comprising a flat or planar perforated support surface;
- at least one suction zone arranged on one side of the perforated support surface;
- a tensioned permeable belt comprising a first side and being guided over a portion of said perforated support surface;
- and
- a pressing surface pressing said permeable belt towards the perforated support surface,
- wherein the pressing surface is one of:
- arranged on a roll;
- perforated;
- straight or planar;
- and
- inwardly curved.
A belt press for a paper machine, the belt press comprising:
- a roll or cylinder comprising a perforated support surface having a diameter greater than approximately 1 meter;
- at least one suction zone arranged on one side of the perforated support surface;
- a tensioned permeable belt comprising a first side and being guided over a portion of said perforated support surface;
- and
- a pressing surface pressing said permeable belt towards the roll or cylinder,
- wherein the pressing surface is one of:
- arranged on a roll;
- perforated;
- straight or planar;
- and
- inwardly curved.
Dependencies are inferred from the claim text.