Press felt

Patent metadata

Field	Value
Publication number	US-12454794-B2
Application number	US-202118042316-A
Country	US
Kind code	B2
Filing date	Jun 30, 2021
Priority date	Aug 18, 2020
Publication date	Oct 28, 2025
Grant date	Oct 28, 2025

Abstract

A press felt for a machine for producing a fibrous material web has a woven base structure and a nonwoven support fixed thereon. The base structure includes a first fabric layer and a second fabric layer, wherein at least the first fabric layer has longitudinal threads and transverse threads which intersect at intersecting points. The longitudinal threads and the transverse threads of the first fabric layer are integrally bonded to each other, in particular welded to each other, at at least 5% of the intersecting points, in particular at at least 10% of the intersecting points.

First claim

The invention claimed is:

1 . A press felt for a machine for producing a fibrous material web, comprising:
a nonwoven overlay; and a woven base structure with said nonwoven overlay fixed thereon, said woven base structure having a first woven fabric ply and a second woven fabric ply;
wherein at least said first fabric ply has longitudinal threads and transverse threads which intersect at intersections, wherein said longitudinal threads and said transverse threads of said first fabric ply are connected to one another in an integrally bonded manner at at least 5% of said intersections;
wherein said longitudinal threads and said transverse threads of said first fabric ply are welded to one another at less than 60% of said intersections; and

wherein points of said intersections being integrally bonded are not situated exclusively in a seam region but are uniformly distributed over an entire area of the press felt.

2 . The press felt according to claim 1 , wherein said second fabric ply has longitudinal threads and transverse threads which intersect at intersections, wherein said longitudinal threads and said transverse threads of said second fabric ply are connected to one another in an integrally bonded manner.

3 . The press felt according to claim 1 , wherein said woven base structure has a further ply.

4 . The press felt according to claim 1 , wherein at least some of said longitudinal threads and/or of said transverse threads of said first fabric ply are absorbent threads which absorb laser light of a wavelength which lies in a range between 780 nm and 1100 nm entirely or to a significant extent.

5 . The press felt according to claim 4 , wherein at least every tenth transverse thread of said transverse threads is an absorbent thread.

6 . The press felt according to claim 4 , wherein at least every tenth longitudinal thread of said longitudinal threads is an absorbent thread.

7 . The press felt according to claim 2 , wherein for each of said intersections at which said longitudinal threads and said transverse threads are connected to one another in said integrally bonded manner in said first fabric ply and/or said second fabric ply, there is no integral bond at adjacent intersections of said intersections.

8 . The press felt according to claim 1 , wherein said points of said intersections being integrally bonded are not situated exclusively in a partial region of the press felt but are distributed over an entire area of the press felt.

9 . The press felt according to claim 1 , wherein said longitudinal threads and said transverse threads of said first fabric ply are connected to one another in said integrally bonded manner at at least 10% of said intersections.

10 . The press felt according to claim 1 , wherein said longitudinal threads and said transverse threads of said first fabric ply are welded to one another at less than 5% of said intersections.

11 . The press felt according to claim 2 , wherein said longitudinal threads and said transverse threads of said second fabric ply are welded to one another at at least 5% of said intersections.

12 . The press felt according to claim 2 , wherein said longitudinal threads and said transverse threads of said second fabric ply are welded to one another at at least 10% of said intersections.

13 . The press felt according to claim 3 , wherein said further ply is a further fabric ply.

14 . The press felt according to claim 5 , wherein at least every fourth transverse thread of said transverse threads is an absorbent thread.

15 . The press felt according to claim 5 , wherein at least every second transverse thread of said transverse threads is an absorbent thread.

16 . The press felt according to claim 4 , wherein at least every fourth longitudinal thread of said longitudinal threads is an absorbent thread.

17 . The press felt according to claim 4 , wherein at least every second longitudinal thread of said longitudinal threads is an absorbent thread.

Assignees

• Voith Patent Gmbh

Inventors

• Eberhardt Robert

Classifications

• D21F7/083 Primary

  Multi-layer felts · CPC title