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US 2003/0192665 A1Published application
Method of making press felt, and press felt
AssigneeTamfelt Oyj Abp
InventorsBo Rokman, Kari Hyvonen, Tauno Virtanen
Life of this patent
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Abstract
A method of making a press felt, and a press felt. The press felt comprises a continuous base fabric in the lateral direction, and at least one batt fibre layer. The closed-loop base fabric is made of longitudinal and transverse yarns. The properties of the press felt, such as permeance, are arranged to be different in edge portions of the press felt from the midportion of the felt.
Claims11
A method of making a press felt, the method comprising
- forming at least one base fabric preform;
- making the at least one base fabric preform into a closed-loop base fabric having predetermined dimensions in the cross-machine direction and the machine direction of a paper machine, and a first and a second longitudinal outer edge;
- forming the base fabric of one or more base fabric preforms that are continuous in the cross-machine direction;
- and
- attaching at least one batt fibre layer onto the base fabric,
- providing both of the longitudinal edges of the press felt with longitudinal edge portions of a predetermined width from the longitudinal outer edge of the press felt and providing a midportion in the longitudinal direction of the press felt between the edge portions;
- and
- attaching different numbers of batt fibre layers onto the edge portions from the midportion of the press felt, whereby the structure of the press felt edge portions differ from the midportion.
5 more elements
A press felt, which comprises
- a closed-loop base fabric, the base fabric being continuous in the cross-machine direction of the press felt,
- at least one batt fibre layer attached onto the base fabric,
- longitudinal edge portions of a predetermined width in the cross-machine direction of the press felt and a midportion between said edge portions;
- and
- the number of batt fibre layers attached on the midportion of the press felt is different from the edge portions, whereby the structure of the edge portions is different from the midportion.
2 more elements
Dependencies are inferred from the claim text.