High tension permeable belt for an ATMOS system and press section of paper machine using the permeable belt
A permeable belt, a belt press including a roll having an exterior surface and the permeable belt, and a method of drying or pressing a web with the permeable belt. The permeable belt has a paper web facing side and is guided over a support surface. The permeable belt can have a tension of between approximately 20 kN/m and approximately 100 KN/m, a permeability value of between approximately 100 cfm and approximately 1200 cfm, a surface contact area of the paper web side that being between approximately 0.5% and approximately 90% when not under tension, and an open area of between approximately 1.0% and approximately 85%. This Abstract is not intended to define the invention disclosed in the specification, nor intended to limit the scope of the invention in any way.
1. A belt press for a paper machine, the belt press comprising:
a permeable belt comprising a paper web facing side and being guided over a support surface;
said permeable belt comprising a tension of between approximately 20 kN/m and approximately 100 KN/m, a permeability value of between approximately 100 cfm and approximately 1200 cfm, a surface contact area of the paper web side that is between approximately 0.5% and approximately 90% when not under tension, and an open area of between approximately 1.0% and approximately 85%.
2. The belt press of claim 1 , wherein the belt press is arranged on an ATMOS system.
3. The belt press of claim 1 , wherein said permeable belt is capable of running at a tension of between approximately 30 kN/m and approximately 60 KN/m.
4. The belt press of claim 1 , wherein said permeable belt is resistant to at least one of hydrolysis and temperatures which exceed 100 degrees C.
5. The belt press of claim 1 , wherein the support surface is static.
6. The belt press of claim 1 , wherein the support surface is arranged on a roll.
7. The belt press of claim 6 , wherein the roll is a vacuum roll having a diameter of between approximately 1000 mm and approximately 2500 mm.
8. The belt press of claim 7 , wherein the vacuum roll has a diameter of between approximately 1400 mm and approximately 1700 mm.
9. The belt press of claim 1 , wherein the belt press forms an extended nip with the support surface.
10. The belt press of claim 9 , wherein the extended nip has an angle of wrap of between approximately 30 degrees and approximately 180 degrees.
11. The belt press of claim 10 , wherein the angle of wrap is at least one of:
between approximately 50 degrees and approximately 140 degrees; and
between approximately 50 degrees and approximately 130 degrees.
12. The belt press of claim 9 , wherein the extended nip has a nip length of between approximately 800 mm and approximately 2500 mm.
13. The belt press of claim 12 , wherein the nip length is between approximately 1200 mm and approximately 1500 mm.
14. The belt press of claim 1 , wherein the permeability value is between approximately 300 cfm and approximately 800 cfm.
15. The belt press of claim 1 , wherein said permeable belt is an endless belt that is at least one of pre-seamed and has its ends joined on a machine which utilizes the belt press.
16. The belt press of claim 1 , wherein the paper web facing side of said permeable belt comprises a warp count of between approximately 5 yarns/cm and approximately 60 yarns/cm.
17. The belt press of claim 16 , wherein the warp count is between approximately 8 yarns/cm and approximately 20 yarns/cm.
18. The belt press of claim 1 , wherein the paper web facing side of said permeable belt comprises a weft count of between approximately 5 yarns/cm and approximately 60 yarns/cm.
19. The belt press of claim 18 , wherein the weft count is between approximately 5 yarns/cm and approximately 20 yarns/cm.
20. The belt press of claim 1 , further comprising:
a first fabric and a second fabric traveling between said permeable belt and said support surface;
said first fabric having a first side and a second side;
said first side of said first fabric being in at least partial contact with said exterior surface of said support surface;
said second side of said first fabric being in at least partial contact with a first side of a fibrous web;
said second fabric having a first side and a second side;
said first side of said second fabric being in at least partial contact with said first side of said permeable belt; and
said second side of said second fabric being in at least partial contact with a second side of said fibrous web.
21. The belt press of claim 20 , wherein said first fabric comprises one of a permeable dewatering belt, a felt, a woven fabric, and a wire.
22. The belt press of claim 20 , wherein said second fabric comprises one of a structured fabric and a TAD fabric.
23. The belt press of claim 21 , wherein said fibrous web comprises a tissue web or hygiene web.
24. A fibrous material drying arrangement comprising:
an endlessly circulating permeable extended nip press (ENP) belt arranged on a belt press and being guided over a roll;
said ENP belt having a tension of between approximately 20 kN/m and approximately 100 KN/m, a permeability value of between approximately 100 cfm and approximately 1200 cfm, a surface contact area of the paper web side that being between approximately 0.5% and approximately 90% when not under tension, and an open area of between approximately 1.0% and approximately 85%.
25. A method of subjecting a fibrous web to pressing in a paper machine using a permeable extended nip press (ENP) belt arranged on a belt press and which is capable of being subjected to a tension of between approximately 20 kN/m and approximately 100 KN/m, wherein the ENP belt comprises a permeability value of between approximately 100 cfm and approximately 1200 cfm, a surface contact area of a paper web side that is between approximately 0.5% and approximately 90% when not under tension, and an open area of between approximately 1.0% and approximately 85%, the method comprising:
applying pressure against a contact area of the fibrous web utilizing the ENP belt of the belt press.