Machine and method for producing a fibrous web
AssigneeVoith Patent GmbH
InventorAdemar Lippi Alves Fernandes
Life of this patent
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Abstract
A machine for producing a fibrous web, such as a tissue web, has pressing device with a pressing element and a counter-element with a closed surface for forming a pressure nip. A water-absorbing belt with a web side and an opposite pressing element side is guided together with the fibrous web through the pressure nip and the fibrous web is separated at the end of the pressure nip from the web side of the water-absorbing belt and runs further with the counter-element. The water-absorbing belt has at least a first ply and a second ply, and, as viewed in the thickness direction of the water-absorbing belt, a layer in or on the belt half which faces the pressing element, which layer has a higher specific throughflow resistance than the first ply and/or the second ply.
Claims20
A machine for producing a fibrous web, the machine comprising:
- at least one pressing device having a press nip formed by a pressing element and an opposing element being a drying cylinder with a closed surface;
- a water-absorbing belt having a web side and an opposite pressing element side;
- wherein, during an operation of the machine, said water-absorbing belt is guided together with the fibrous web through said press nip and the fibrous web is separated from said web side of said water-absorbing belt upon issuing from said press nip, and the fibrous web runs further on the closed surface of said drying cylinder;
- said water-absorbing belt having at least a first ply and a second ply, and, viewed in a thickness direction of said water-absorbing belt, a layer on a half of said water-absorbing belt that faces said pressing element;
- said layer having a specific throughflow resistance that is higher than a specific throughflow resistance of at least one of said first ply or said second ply.
A water-absorbing belt for use in a machine for producing a fibrous web, the machine having a pressing device with a press nip formed by a pressing element and an opposing drying cylinder with a closed surface, the water-absorbing belt comprising:
- at least a first ply and a second ply, and, as viewed in a thickness direction of the water-absorbing belt, a layer on a half of the water-absorbing belt which faces the pressing element;
- said layer having a specific throughflow resistance that is higher than a specific throughflow resistance of at least one of said first ply or said second ply.
A method for producing a fibrous web, the method comprising:
- providing at least one pressing device with a press nip formed between a pressing element and an opposing drying cylinder having a closed surface;
- providing a water-absorbing belt with at least a first ply, a second ply, and, as viewed in a thickness direction of the water-absorbing belt, a layer on a half of the water-absorbing belt which faces toward the pressing element, and wherein the layer has a higher specific throughflow resistance than a specific throughflow resistance of the first ply and/or the second ply;
- and
- guiding the water-absorbing belt together with the fibrous web through the press nip such that the fibrous web is separated from a web side of the water-absorbing belt at the end of the press nip and runs further on the closed surface of the drying cylinder.
Dependencies are inferred from the claim text.