Paper machine clothing and use of such a clothing

Patent metadata

Field	Value
Publication number	US-12305330-B2
Application number	US-202218570214-A
Country	US
Kind code	B2
Filing date	Jun 3, 2022
Priority date	Jun 14, 2021
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

A clothing for a machine for producing or processing a material web has a first and a second woven layer. The clothing has more first longitudinal threads than second longitudinal threads, but the number of first longitudinal threads is at most twice as large as the number of second longitudinal threads. Transverse threads of the second woven layer form contact floats on the machine contact side. Longitudinal threads of the first and second woven layer in each weaving repeat are arranged a first group and a second group. In the first group the longitudinal threads of the first and second layers are arranged precisely one above the other in the thickness direction of the clothing, while in the second group neither of two longitudinal threads of the first layer is arranged precisely above a single longitudinal thread of the second woven layer in the thickness direction of the clothing.

First claim

The invention claimed is:

1. A clothing for a machine for producing or processing a material web, the clothing comprising:
a first woven-fabric layer forming a web material contact side, said first woven-fabric layer being formed by interwoven first longitudinal threads that run in a clothing longitudinal direction and first transverse threads that run in a clothing cross direction; and
a second woven-fabric layer forming a machine contact side, said second woven-fabric layer being formed by interwoven second longitudinal threads that run in the clothing longitudinal direction and second transverse threads that run in the clothing cross direction;
said first woven-fabric layer and said second woven-fabric layer being connected to one another via binder threads;
a number of first longitudinal threads in the clothing being greater than a number of second longitudinal threads, but being at most double the number of second longitudinal threads; and
a weaving pattern of the clothing recurring in repeats, and the second transverse threads in each repeat forming at least two contact floats on the machine contact side, with all contact floats of the second transverse threads having a length of at most two;
said first longitudinal threads and said second longitudinal threads in each repeat being disposed in a plurality of groups, with at least one first group and one second group, wherein the first group is formed of one first longitudinal thread and one second longitudinal thread that are disposed exactly on top of one another in a thickness direction of the clothing, while the second group is formed of two first longitudinal threads and one second longitudinal thread, and wherein none of the two first longitudinal threads of the second group is disposed exactly above the one second longitudinal thread of the second group in the thickness direction of the clothing.

2. The clothing according to claim 1 , wherein said first longitudinal threads and said second longitudinal threads are dimensioned and disposed relative to one another in such a manner that, when viewed in a projection in the thickness direction of the clothing, said threads within a repeat form at least one free longitudinal strip.

3. The clothing according to claim 2 , wherein the at least one free longitudinal strip is formed at all locations where different groups are disposed adjacent one another.

4. The clothing according to claim 1 , wherein a number of said first groups differs from a number of said second groups in the clothing.

5. The clothing according to claim 1 , wherein said second transverse threads form at most six contact floats on the machine contact side in each repeat.

6. The clothing according to claim 1 , wherein the binding threads always run in pairs beside one another in the clothing cross direction, and said binding threads continue a weaving pattern on the web material contact side.

7. The clothing according to claim 6 , wherein the binding threads continue the weaving pattern on the web material contact side in an alternating manner.

8. The clothing according to claim 1 , wherein said first woven-fabric layer has a plain weave.

9. The clothing according to claim 1 , wherein said first woven-fabric layer has a twill weave.

10. The clothing according to claim 9 , wherein the twill weave of said first woven-fabric layer is a 2/1 twill weave.

11. The clothing according to claim 9 , wherein the twill weave of said first woven-fabric layer is a 3/1 twill weave.

12. The clothing according to claim 9 , wherein the twill weave of said first woven-fabric layer is a broken twill weave.

13. The clothing according to claim 9 , wherein the twill weave of said first woven-fabric layer is a non-broken twill weave.

14. The clothing according to claim 1 , wherein said second woven-fabric layer has a non-broken twill weave.

15. The clothing according to claim 1 , wherein said second woven-fabric layer has a broken twill weave.

16. The clothing according to claim 1 , wherein two neighboring contact floats of the second transverse thread are separated from one another by at most two second longitudinal threads.

17. The clothing according to claim 15 , wherein two neighboring contact floats of the second transverse thread are in each case separated from one another by only one second longitudinal thread.

18. The clothing according to claim 1 , being a forming screen for processing a tissue web.

19. The clothing according to claim 1 configured for producing a tissue web having a specific area weight between 8 g/m 2 and 30 g/m 2 .

Assignees

• Voith Patent Gmbh

Inventors

• Böck Johann
• Gallik Jan

Classifications

• D03D11/00

  Double or multi-ply fabrics not otherwise provided for · CPC title

• D21F1/0036 Primary

  Multi-layer screen-cloths · CPC title

• D21F1/0045 Primary

  Triple layer fabrics · CPC title