Fiber web machine sleeve roll belt

Patent metadata

Field	Value
Publication number	US-11725344-B2
Application number	US-202117325019-A
Country	US
Kind code	B2
Filing date	May 19, 2021
Priority date	May 20, 2020
Publication date	Aug 15, 2023
Grant date	Aug 15, 2023

Abstract

A belt ( 10 ) for a sleeve roll forms a closed loop and has an inner surface ( 11 ), an outer surface ( 12 ), an elastic body ( 15 ), and a reinforcing structure ( 30 ). The reinforcing structure has first yarns ( 31 a ) arranged to a first direction (D 1 ) of the belt, and second yarns ( 32 a ) arranged to a second direction (D 2 ) of the belt which is parallel or substantially parallel to a travel direction of the belt, and/or perpendicular or substantially perpendicular to the first direction (D 1 ). The belt ( 10 ) is configured to stretch elastically more in the second direction (D 2 ) than in the first direction (D 1 ) so that it will return to its original length after forces stretching the belt have been removed. This invention further relates to an arrangement including a belt and a sleeve roll. This invention further relates to a use of a belt.

First claim

I claim:

1. A sleeve roll belt in a forming section of a paper, board, pulp or tissue machine, the belt forming a closed loop and the closed loop being arranged to rotate and travel in a machine direction, the belt comprising:
an elastic body forming the closed loop and defining an inner surface within the closed loop, and an outer surface outside the closed loop, wherein the elastic body is between the inner surface and the outer surface;
a reinforcing structure arranged within the elastic body and comprised of first yams extending in a first direction which is at least substantially in a cross machine direction, wherein the cross machine direction is transverse to a machine direction in which the belt is arranged to rotate, and second yams extending in a second direction which is at least substantially in the machine direction;
wherein the belt is configured to stretch elastically more in the second direction than in the first direction so that it will return to its original length after forces stretching the belt have been removed;
wherein a number of the second yams per meter in the first direction is greater than a number of the first yams per meter in the second direction and wherein the number of the second yarns per meter is at least 1.25 times the number of the first yarns per meter.

2. The sleeve roll belt of claim 1 wherein the number of the second yams is in a range between 490 yarns/m and 630 yarns/m.

3. The sleeve roll belt of claim 2 wherein the number of the first yams is in a range between 230 yarns/m and 390 yarns/m.

4. The sleeve roll belt of claim 1 wherein the number of the first yams is in a range between 230 yarns/m and 390 yarns/m.

5. The sleeve roll belt of claim 1 wherein a diameter of the second yarns is smaller than a diameter of the first yarns.

6. The sleeve roll belt of claim 5 wherein a diameter of the first yarns is in a range between 0.5 mm and 2.0 mm.

7. The sleeve roll belt of claim 6 wherein a diameter of the second yarns is in a range between 0.5 mm and 1.5 mm.

8. The sleeve roll belt of claim 1 wherein a diameter of the second yarns is in a range between 0.5 mm and 1.5 mm.

9. The sleeve roll belt of claim 1 wherein the first yarns form an innermost yarn layer, which is closer to the inner surface of the belt than the second yarns.

10. The sleeve roll belt of claim 9 wherein the second yarns form an outermost yarn layer which is closer to the outer surface of the belt than the first yarns.

11. The sleeve roll belt of claim 1 wherein the second yarns form an outermost yarn layer, which is close to the outer surface of the belt than the first yarns.

12. The sleeve roll belt belt of claim 1 wherein the belt is configured to stretch elastically at least 1.5% in the second direction.

13. The sleeve roll belt of claim 12 wherein the belt is configured to stretch elastically in a range between 1.8% and 3.0% in the second direction so that the belt will return to its original length after forces stretching the belt are removed.

14. The sleeve roll belt of claim 1 wherein a load at specific elongation of 2% in the second direction of the belt is equal to or greater than 28 kN/m and equal to or less than 50 kN/m.

15. The sleeve roll belt of claim 1 wherein a load at specific elongation of 4% in the second direction of the belt is equal to or more than 49 kN/m and equal to or less than 70 kN/m.

16. The sleeve roll belt of claim 1 wherein the belt is configured to stretch elastically at least 4% more in the second direction of the belt than in the first direction of the belt.

17. The sleeve roll belt of claim 1 wherein the belt is configured to stretch elastically at least 8% more in the second direction of the belt than in the first direction of the belt.

18. The sleeve roll belt of claim 1 wherein the belt is configured to return to its original length after a load of 25 kN/m to 30 kN/m stretches the belt in the travel direction of the belt and the load is removed.

19. The sleeve roll belt of claim 1 wherein the belt has a tensile elongation at break of 20% to 25%, measured at a temperature of 20° C. in the travel direction of the belt.

20. The sleeve roll belt of claim 1 wherein the belt has a breaking strength in a range between 130 kN/m and 230 kN/m in the machine direction.

21. The sleeve roll belt of claim 1 wherein the first yarns are composed of a fiber selected from the group consisting of: polyamide, polyethylene, aromatic polyamide, polyester, polyethylene terephthalate, carbon fibers, and a carbon fiber thermoplastic composite; and
wherein the second yarns are composed of a fiber selected from the group consisting of: polyester, polyethylene terephthalate, polyamide, polyethylene, aromatic polyamide, carbon fibers, and a carbon fiber thermoplastic composite.

22. The sleeve roll belt of claim 1 wherein the elastic body of the belt has portions comprising a plurality of dewatering grooves in the outer surface and arranged in the machine direction of the sleeve roll belt, the dewatering grooves being separated by lands, each of the dewatering grooves having a depth below the outer surface of from 0.3 to 1.5 mm.

23. The sleeve roll belt of claim 1 wherein the second yams extending in a second direction which is at least substantially in the machine direction comprise adjacent second yams, and groove-forming portions of each of the adjacent second yams extend above the outer surface of the sleeve roll belt, said groove-forming portions of said adjacent second yarns defining parallel grooves therebetween.

24. An arrangement comprising
a sleeve roll; and
a belt having an elastic body forming a closed loop about the sleeve roll and defining an inner surface within the closed loop, and an outer surface outside the closed loop, wherein the elastic body is between the inner surface and the outer surface;
a reinforcing structure arranged within the elastic body and comprised of first yarns extending in a first direction which is at least substantially in a cross machine direction, wherein the cross machine direction is transverse to a machine direction in which the belt is arranged to rotate, and second yarns extending in a second direction which is at least substantially in the machine direction;
wherein the belt is configured to stretch elastically more in the second direction than in the first direction so that it will return to its original length after forces stretching the belt have been removed;
wherein a number of the second yarns per meter in the first direction is in a range between 490 yarns/m and 630 yarns/m and a number of the first yarns per meter in the second direction is in a range between 230 yarns/m and 390 yarns/m wherein the number of the second yarns per meter is at least 1.25 times the number of the first yarns per meter.

25. A method of using a belt on a sleeve roll in a fiber web machine, comprising:
dewatering a fiber web in a fiber web machine with a sleeve roll supporting a belt having an elastic body forming a closed loop about the sleeve roll and defining an inner surface within the closed loop, and an outer surface outside the closed loop, wherein the elastic body is between the inner surface and the outer surface;
wherein a reinforcing structure is arranged within the elastic body, the reinforcing structure being comprised of first yarns extending in a first direction which is at least substantially in a cross machine direction, wherein

Assignees

• Valmet Technologies Oy

Inventors

• Hagfors Satu
• Riihioja Vesa-Matti

Classifications

• D21F3/0227 Primary

  Belts or sleeves therefor · CPC title

• D21F1/40 Primary

  Rolls · CPC title

• D21F1/0036 Primary

  Multi-layer screen-cloths · CPC title

• D21F3/0236

  manufacturing methods · CPC title

• B29D29/00

  Producing belts or bands · CPC title