Fabric belt for producing web material, in particular for producing spunbonded fabric

Patent metadata

Field	Value
Publication number	US-10435828-B2
Application number	US-201515500177-A
Country	US
Kind code	B2
Filing date	Jul 29, 2015
Priority date	Aug 7, 2014
Publication date	Oct 8, 2019
Grant date	Oct 8, 2019

Abstract

A woven-fabric belt for producing web material, in particular for producing spunbonded fabric, with a plurality of longitudinal threads, running substantially in a longitudinal belt direction, and a plurality of transverse threads, running substantially in a transverse belt direction. The longitudinal threads bind with the transverse threads at binder points, and crown regions of the longitudinal threads are formed on a web-material contacting side. On the web-material contacting side a multiplicity of deposits are provided at least on the longitudinal threads. The deposits do not extend into crown regions and/or deposits which do extend into crown regions in the longitudinal belt direction are asymmetrical in relation to a respective crown region.

First claim

The invention claimed is:

1. A woven-fabric belt for producing web material, the belt comprising:
a plurality of longitudinal threads running substantially in a longitudinal belt direction;
a plurality of transverse threads running substantially in a transverse belt direction;
said longitudinal threads binding with said transverse threads at binder points;
crown regions of said longitudinal threads being formed on a web-material contacting side; and
a multiplicity of deposits on the web-material contacting side on said longitudinal threads, and wherein the following is true:
a plurality of said deposits do not extend into said crown regions;
said deposits which do extend into said crown regions are asymmetrical in the longitudinal belt direction in relation to a respective said crown region; and
substantially all said deposits have a contour that is substantially elongated in the longitudinal belt direction.

2. The woven-fabric belt according to claim 1 , which comprises deposits that contact at least two said longitudinal threads that lie next to one another.

3. The woven-fabric belt according to claim 1 , wherein at least 70% by volume of a deposit volume in the longitudinal belt direction of at least a part of said deposits that are asymmetrical relative to a respective said crown region is disposed on one side relative to the respective said crown center.

4. The woven-fabric belt according to claim 3 , wherein at least 80% by volume of at least a part of said deposits is disposed on one side relative to the respective said crown center.

5. The woven-fabric belt according to claim 1 , where said deposits are provided with an area density in a range from 5 to 500 deposits/cm 2 .

6. The woven-fabric belt according to claim 5 , where said area density lies in a range from 50 to 200 deposits/cm 2 .

7. The woven-fabric belt according to claim 1 , wherein at least 80% of said deposits have a length in the longitudinal belt direction in a range from 250 to 2500 μm.

8. The woven-fabric belt according to claim 7 , wherein the length of at least 80% of said deposits lies in a range from 1000 to 1500 μm.

9. The woven-fabric belt according to claim 1 , wherein at least 80% of said deposits have a maximum protrusion height beyond a respectively supporting thread in a range from 50 to 500 μm.

10. The woven-fabric belt according to claim 9 , wherein the maximum protrusion height lies in a range from 100 to 250 μm.

11. The woven-fabric belt according to claim 1 , where at least one of the following is true:
at least part of said longitudinal threads and/or transverse threads are constructed using polyethylene terephthalate (PET) material;
all of said longitudinal threads and/or transverse threads are constructed using PET material;
at least part of said deposits are constructed using silicone material or polyurethane (PU) material.

12. The woven-fabric belt according to claim 1 , wherein said longitudinal threads are warp threads and said transverse threads are weft threads.

13. A method for producing spunbonded fabric, the method comprising:
providing a woven-fabric belt according to claim 1 ;
applying spunbonded threads onto the web-material contacting side of the woven-fabric belt, moving in a belt-movement direction in at least one spunbonded-thread application region.

14. The method according to claim 13 , wherein the at least one spunbonded-thread application region comprises a multiplicity of spunbonded-thread extrusion nozzles, sequential in the transverse belt direction, for dispensing spunbonded threads onto the web-material contacting side of the woven-fabric belt.

15. The method according to claim 13 , which comprises moving the woven-fabric belt through a plurality of spunbonded-thread application regions which are sequential in the belt-movement direction.

16. The method according to claim 15 , wherein each of said plurality of spunbonded-thread application regions comprises a multiplicity of spunbonded-thread extrusion nozzles, sequential in the transverse belt direction, for dispensing spunbonded threads onto the web-material contacting side of the woven-fabric belt.

17. The method according to claim 13 , which comprises applying spunbonded threads that are configured with PP material on at least one thread surface, and moving the woven-fabric belt at a speed of at least 600 m/min in the belt-movement direction, and applying in an upstream first spunbonded-thread application region spunbonded threads having an area weight of no more than 4 g/m 2 onto the web-material contacting side of the woven-fabric belt.

18. The method according to claim 13 , which comprises applying spunbonded threads that are configured with PE material on at least one thread surface, and moving the woven-fabric belt at a speed of at least 300 m/min in the belt-movement direction, and applying in an upstream first spunbonded-thread application region spunbonded threads having an area weight of no more than 8 g/m 2 onto the web-material contacting side of the woven-fabric belt.

19. A method for producing spunbonded fabric, the method comprising:
providing a woven-fabric belt with longitudinal threads running substantially in a longitudinal belt direction and plurality of transverse threads running substantially in a transverse belt direction engaging one another at a plurality binder points, and wherein the longitudinal threads form crown regions on a web-material contacting side of the woven belt;
depositing a multiplicity of deposits on the web-material contacting side on the longitudinal threads, with substantially all the deposits having a contour that is substantially elongated in the longitudinal belt direction, with a plurality of deposits that do not extend into the crown regions and/or with a plurality of deposits that do extend into the crown regions being asymmetrical in the longitudinal belt direction relative to the crown region;
moving the woven belt in a belt-movement direction through at least one spunbonded-thread application region and applying spunbonded threads onto the web-material contacting side of the woven-fabric belt while moving in the at least one spunbonded-thread application region.

20. The method according to claim 19 , wherein the at least one spunbonded-thread application region comprises a multiplicity of spunbonded-thread extrusion nozzles, sequential in the transverse belt direction, for dispensing spunbonded threads onto the web-material contacting side of the woven-fabric belt.

Assignees

• Voith Patent Gmbh

Inventors

• Koeckritz Uwe
• Abraham Juergen
• Morton Antony

Classifications

• D04H3/02 Primary

  characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments · CPC title

• D03D3/04

  Endless fabrics · CPC title