Forming fabric

Patent metadata

Field	Value
Publication number	US-9556560-B2
Application number	US-201414522634-A
Country	US
Kind code	B2
Filing date	Oct 24, 2014
Priority date	Apr 27, 2012
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

A woven-fabric web, such as a forming fabric or forming wire, for a machine for producing and/or processing a fibrous web, has a first woven-fabric layer with first longitudinal threads and first transverse threads interwoven with the first longitudinal threads and a second woven-fabric layer with second longitudinal threads and second transverse threads interwoven with the second longitudinal threads. The weaving pattern of the fabric is repeated in pattern repeats. The first and second longitudinal threads are arranged in a plurality of groups in each pattern repeat, with a first group and a second group and at least one further of the first and/or second group. Each first group is formed from a first longitudinal thread and a second longitudinal thread arranged below the first longitudinal thread and the first and second longitudinal threads in each group are arranged at no offset or only a slight offset in plan view.

First claim

The invention claimed is:

1. A fabric tape for a machine for manufacturing and/or processing a fibrous web, the fabric tape comprising:
a first fabric layer having first longitudinal threads and first cross threads interwoven with said first longitudinal threads;
a second fabric layer having second longitudinal threads and second cross threads interwoven with said second longitudinal threads;
said first and second fabric layers being disposed on top of one another and having a weaving pattern repeated in repeats;
said first longitudinal threads and said second longitudinal threads in each repeat being disposed in a plurality of groups, having one first group and one second group and at least one further of said first and/or second group;
each said first group being formed by one first longitudinal thread and one second longitudinal thread disposed below said one first longitudinal thread;
each said second group being formed by two first longitudinal threads and one second longitudinal thread disposed below said two first longitudinal threads;
said first and second longitudinal threads in each group, viewed in a projection perpendicularly onto said fabric layers, being disposed so as not to be offset or only slightly offset in relation to one another, with a maximum offset defining a free space of half a diameter of a first longitudinal thread therebetween; and
wherein a number of first groups of longitudinal threads is different from a number of second groups of longitudinal threads.

2. The fabric tape according to claim 1 , wherein:
said first and second groups in the repeat are disposed in a plurality of superordinate groups of longitudinal threads;
each superordinate group of longitudinal threads comprises a first group, a second group, and at least one further group being a first or second group;
the repeat is formed by an integral number of superordinate groups of longitudinal threads disposed next to one another in a cross-thread direction.

3. The fabric tape according to claim 1 , wherein the same of the first or second group of longitudinal threads is disposed directly next to one another at maximum four times.

4. The fabric tape according to claim 1 , configured as a forming wire for processing fibrous material, with said first fabric layer having an outer side facing away from said second fabric layer and which, on use of the forming wire, provides a paper side to be brought into contact with the fibrous material.

5. The fabric tape according to claim 1 , configured as a forming wire, with said second fabric layer having an outer side facing away from said first fabric layer and which, on use of the fabric tape, provides a machine side to be brought into contact with the machine.

6. The fabric tape according to claim 1 , wherein the fabric tape has only said first and second groups of longitudinal threads.

7. The fabric tape according to claim 1 , which comprises binder threads disposed in pairs and connecting said first and second fabric layers to one another.

8. The fabric tape according to claim 7 , wherein said binder threads extend in a cross-thread direction.

9. The fabric tape according to claim 7 , wherein each pair of binder threads has two binder threads respectively interwoven in a mutually interchanging manner with first and second longitudinal threads and intersecting at intersection points upon changing from being interwoven with the first longitudinal threads to being interwoven with the second longitudinal threads and vice-versa.

10. The fabric tape according to claim 9 , wherein each respective pair of binder threads in the repeat provides for two intersection points.

11. The fabric tape according to claim 7 , wherein said binder threads of each pair of binder threads, between immediately successive intersection points, form in each case first binder segments by interweaving with said first longitudinal threads, and at least one of said first binder segments of each pair of binder threads is formed in the repeat in that the respective said binder thread, running on an outer side of said first fabric layer, intersects at least four, not immediately successive first longitudinal threads.

12. The fabric tape according to claim 11 , wherein said binder threads of each pair of binder threads in the repeat together form two first binder segments, wherein the one first binder segment is formed in that the one binder thread of the pair, when being interwoven with the first longitudinal threads, runs alternatingly on the outer side of the first fabric layer and between the first and second fabric layers and, running on the outer side of the first fabric layer, intersects at least two first longitudinal threads, and wherein the other first binder segment is formed in that the other binder thread of the pair, when being interwoven with the first longitudinal threads, runs alternatingly on the outer side of the first fabric layer and between the first and second fabric layers and, running on the outer side of the first fabric layer, intersects the same number of first longitudinal threads as the one binder thread.

13. The fabric tape according to claim 11 , wherein said binder threads of each pair of binder threads in the repeat together form two first binder segments, wherein the one first binder segment is formed in that the one binder thread of the pair, when being interwoven with the first longitudinal threads, runs alternatingly on the outer side of the first fabric layer and between the first and second fabric layers and, running on the outer side of the first fabric layer, intersects at least two first longitudinal threads, and wherein the other first binder segment is formed in that the other binder thread of the pair, when being interwoven with the first longitudinal threads, runs alternatingly on the outer side of the first fabric layer and between the first and second fabric layers and, running on the outer side of the first fabric layer, intersects a number of first longitudinal threads that is greater or smaller by up to four first longitudinal threads than the one binder thread.

14. The fabric tape according to claim 13 , wherein the other binder thread intersects up to two fewer or more first longitudinal threads than the one binder thread.

15. The fabric tape according to claim 7 , wherein said first fabric layer is formed by interweaving said first longitudinal threads with said first cross threads and said binder threads, and said second fabric layer is formed by interweaving said second longitudinal threads with said second cross threads.

16. The fabric tape according to claim 1 , wherein a ratio of first warp threads to second warp threads is greater than 1.5.

17. The fabric tape according to claim 16 , wherein the ratio of the first warp threads to the second warp threads is smaller than 2.

18. The fabric tape according to claim 1 , wherein said first fabric layer forms a plain weave.

19. The fabric tape according to claim 1 , wherein said first and second fabric layers are configured as a forming wire for a papermaking machine.

20. A fabric tape for a machine for manufacturing and/or processing a fibrous web, the fabric tape comprising:
a first fabric layer having first longitudinal threads and first cross threads interwoven with said first longitudinal threads;
a second fabric layer having second longitudinal threads and second cross threads interwoven with said second longitudinal threads;
said first and second fabric layers being disposed on top of one another and having a wea

Assignees

• Voith Patent Gmbh

Inventors

• Boeck Johann

Classifications

• D21F1/0045 Primary

  Triple layer fabrics · CPC title

• D03D13/004

  with weave pattern being non-standard or providing special effects · CPC title

• D03D11/00

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

• D03D3/04

  Endless fabrics · CPC title