Fabric for a web-producing machine and such a machine with a corresponding fabric

Patent metadata

Field	Value
Publication number	US-11293141-B2
Application number	US-201917265006-A
Country	US
Kind code	B2
Filing date	Jun 13, 2019
Priority date	Aug 1, 2018
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

A fabric for a web-producing machine, such as a papermaker's machine for producing paper, tissue or board, contains a machine-side and a paper-side. The fabric further contains MD-yarns and CD-yarns interwoven with each other in a predetermined repeat pattern. The MD-yarns 12 have a non-circular cross-section, and a width-to-height aspect ratio of the MD-yarns 12 is greater than 10:1, preferably at least 11:1. Furthermore, a web-producing machine, such as a papermaker's machine for producing paper, tissue or board, contains a fabric of the above described type, where the fabric is preferably applied in a dryer section of the web-producing machine.

First claim

The invention claimed is:

1. A fabric for a web-producing machine, the fabric being a double-layer fabric comprising:
a machine-side;
a paper-side; and
an upper layer and a lower layer forming the double-layer fabric;
MD-yarns having a non-circular cross-section, wherein said MD-yarns, which have the non-circular cross-section, include upper layer MD-yarns in said upper layer and lower layer MD-yarns in said lower layer, wherein a width-to-height aspect ratio of said MD-yarns is greater than 10:1; and
CD-yarns interwoven with said MD-yarns in a predetermined repeat pattern resulting in the fabric being a dryer fabric of a papermaker's machine for producing paper, tissue or board;
said upper layer MD-yarns interlacing with said CD-yarns; and
said lower layer MD-yarns interlacing with said CD-yarns;
wherein said upper layer MD-yarns do not intersect with said lower layer MD-yarns; and
wherein the fabric includes at least two groups of said CD-yarns with differently dimensioned cross-sections.

2. The fabric according to claim 1 , wherein the width-to-height aspect ratio of said MD-yarns is not greater than 15:1.

3. The fabric according to claim 1 , wherein a width of said MD-yarns is between 2.0 mm and 2.4 mm.

4. The fabric according to claim 1 , wherein some of said CD yarns are disposed along their complete path between said upper layer MD-yarns and said lower layer MD-yarns, thus, not being visible from said paper-side and/or said machine-side of the fabric, whereas remaining said CD-yarns are at least partly visible from said paper-side and/or said machine-side of the fabric.

5. The fabric according to claim 1 , wherein said MD-yarns and/or said CD-yarns are made of monofilaments.

6. The fabric according to claim 1 , wherein said MD-yarns have a flattened shape with a flat upper surface side and a flat lower surface side, wherein said flat upper surface side and said flat lower surface side extend substantially parallel to each other.

7. The fabric according to claim 1 , wherein said MD-yarns have an octagonal cross-section.

8. The fabric according to claim 1 , wherein:
said CD-yarns have a circular cross-section; and
a diameter of said CD-yarns is not smaller than 0.5 mm and/or not larger than 1.0 mm.

9. The fabric according to claim 1 , wherein the fabric contains at least a first group of said CD-yarns with a circular cross-section of a first diameter and a second group of said CD-yarns with a circular cross-section of a second diameter, the second diameter being greater than the first diameter, wherein a ratio of the second diameter to the first diameter is between 2:1 and 1:1.

10. The fabric according to claim 1 , wherein the fabric is flat woven and contains a seam area for making the fabric endless, wherein said seam area has seam loops formed by said MD-yarns for implementing a pintle joint.

11. The fabric according to claim 1 , wherein the width-to-height aspect ratio of said MD-yarns is at least 11:1.

12. The fabric according to claim 2 , wherein the width-to-height aspect ratio of said MD-yarns is not greater than 12:1.

13. The fabric according to claim 3 , wherein the width of said MD-yarns is 2.2 mm, and/or the height of said MD-yarns is 0.2 mm.

14. The fabric according to claim 5 , wherein said monofilaments are selected from the group of a polymeric material, a PET, a PPS, a PCTA and a POK.

15. The fabric according to claim 9 , wherein the ratio of the second diameter to the first diameter is 3:2.

16. The fabric according to claim 1 , wherein a height of said MD-yarns is between 0.1 mm and 0.3 mm.

17. A web-producing machine, comprising:
a dryer section; and
a double layer fabric including:
a machine-side,
a paper-side, and
an upper layer and a lower layer forming the double-layer fabric,
MD-yarns having a non-circular cross-section, wherein said MD-yarns, which have the non-circular cross-section, include upper layer MD-yarns in said upper layer and lower layer MD-yarns in said lower layer, wherein a width-to-height aspect ratio of said MD-yarns is greater than 10:1, and
CD-yarns interwoven with said MD-yarns in a predetermined repeat pattern resulting in the fabric being a dryer fabric of a papermaker's machine for producing paper, tissue or board;
said upper layer MD-yarns interlacing with said CD-yarns, and
said lower layer MD-yarns interlacing with said CD-yarns,

wherein said upper layer MD-yarns do not intersect with said lower layer MD-yarns;
wherein the fabric includes at least two groups of said CD-yarns with differently dimensioned cross-sections; and
wherein the fabric is applied in said dryer section of the web-producing machine.

18. A fabric for a web-producing machine, the fabric comprising:
a machine-side;
a paper-side;
MD-yarns having a non-circular cross-section, wherein a width-to-height aspect ratio of said MD-yarns being greater than 10:1; and
CD-yarns interwoven with said MD-yarns in a predetermined repeat pattern resulting in the fabric being a dryer fabric of a papermaker's machine for producing paper, tissue or board;
wherein the fabric contains at least two groups of said CD-yarns with differently dimensioned cross-sections;
wherein the fabric contains at least a first group of said CD-yarns with a circular cross-section of a first diameter and a second group of said CD-yarns with a circular cross-section of a second diameter, the second diameter being greater than the first diameter, wherein a ratio of the second diameter to the first diameter is between 2:1 and 1:1; and
wherein said CD-yarns of said second group are not visible from said paper-side and/or said machine-side of the fabric, whereas said CD-yarns of said first group are at least partly visible from said paper-side and/or said machine-side of the fabric.

Assignees

• Voith Patent Gmbh

Inventors

• Alias Anas
• Koeckritz Uwe
• Karapayah Izharraj

Classifications

• D21F7/12 Primary

  Drying · CPC title

• D21F9/02

  of the Fourdrinier type · CPC title

• D21F1/0027 Primary

  Screen-cloths · CPC title

• D21F7/083

  Multi-layer felts · CPC title