What is claimed:
1. An apparatus for treating a fibrous web comprising:
at least one supporting surface arranged to support a surface of the fibrous web;
at least one sealing device positionable adjacent a surface of the web opposite the surface of the web supported by the at least one supporting surface;
said at least one sealing device comprising a sealing element and a holder structured and arranged to hold and to enable lateral sliding movement of said at least one sealing device cross-wise to a web travel direction.
2. The apparatus in accordance with claim 1, wherein the lateral sliding movement facilitates installation and removal of said at least one sealing device.
3. The apparatus in accordance with claim 1, wherein the fibrous web comprises at least one of a paper and board web.
4. The apparatus in accordance with claim 1, further comprising at least one supporting belt arranged to support and guide the fibrous web over said at least one support surface and past said at least one sealing device.
5. The apparatus in accordance with claim 4, wherein said at least one supporting belt comprises at least one of a dewatering belt, press belt, and mesh belt.
6. The apparatus in accordance with claim 4, wherein said sealing device is positioned adjacent a surface of said at least one supporting belt opposite the surface supporting the fibrous web.
7. The apparatus in accordance with claim 4, wherein said at least one supporting surface is structured and arranged to be one of a moving or stationary surface.
8. The apparatus in accordance with claim 1, wherein said sealing element is structured and arranged to form a non-contacting seal with the fibrous web.
9. The apparatus in accordance with claim 1, wherein said holder comprises a guide structured and arranged to laterally draw said sealing element out of said holder.
10. The apparatus in accordance with claim 1, further comprising an air-based device, and said sealing device is coupled to said air-based device.
11. The apparatus in accordance with claim 10, wherein said air-based device comprises at least one of a steam blower box, a suction box, a stabilizer, and ventilation fittings.
12. The apparatus in accordance with claim 10, wherein said air based device is positionable in one of a press section and a drying section.
13. The apparatus in accordance with claim 1, wherein said sealing element comprises a flexible sealing blade.
14. The apparatus in accordance with claim 13, further comprising a pressing element structured and arranged so that, when said sealing blade held in said holder, said pressing element is positionable to move said sealing blade from one of a maintenance or changing position to an operating position, and said pressing element is positionable to move said sealing blade from said operating position to the one of a maintenance or changing position.
15. The apparatus in accordance with claim 14, wherein said sealing blade comprises a sealing section, which, when the sealing blade is in the operating position, is located in vicinity of the surface of the fibrous web opposite the surface supported by said at least one supporting surface.
16. The apparatus in accordance with claim 13, wherein said sealing blade in said one of a maintenance or changing position is at least substantially flat.
17. The apparatus in accordance with claim 13, wherein said sealing blade in said operating position is curved.
18. The apparatus in accordance with claim 13, wherein a distance of said sealing section of said sealing blade from the fibrous web can be set via said pressing element.
19. The apparatus in accordance with claim 13, further comprising a supporting belt arranged to guide the fibrous web over said at least one supporting surface and past said at least one sealing device,
wherein a distance of said sealing section of said sealing blade from said supporting belt can be set via said pressing element.
20. The apparatus in accordance with claim 13, wherein said pressing element comprises a pressing blade.
21. The apparatus in accordance with claim 13, wherein said pressing blade has a greater stiffness than said sealing blade.
22. The apparatus in accordance with claim 13, wherein said pressing element is accommodated in a recess in a carrier.
23. The apparatus in accordance with claim 22, wherein said carrier comprises an air-based device.
24. The apparatus in accordance with claim 13, wherein said recess is at least partially covered by said pressing blade.
25. The apparatus in accordance with claim 13, wherein said pressing element is structured and arranged to be laterally guidable out of said holder.
26. The apparatus in accordance with claim 1, wherein said sealing element comprises a sealing strip.
27. The apparatus in accordance with claim 26, wherein said sealing strip is mounted fixedly.
28. The apparatus in accordance with claim 26, wherein said sealing strip is mounted in a compliant or sprung manner.
29. The apparatus in accordance with claim 26, wherein said sealing strip is held in said holder, which is coupled to a recess of a carrier via a spring.
30. The apparatus in accordance with claim 29, wherein the spring is coupled to a bottom of said recess and said carrier comprises an air-based device.
31. The apparatus in accordance with claim 26, wherein said sealing strip is held in said holder, which is pivotably mounted in an area of a recess in a carrier comprising an air-based device.
32. The apparatus in accordance with claim 1, further comprising an actuating element structured and arranged to pivotably adjust said holder.
33. The apparatus in accordance with claim 1, wherein said holder comprises a guide element that is pivotable relative to said sealing element to facilitate removal of said sealing element.
34. The apparatus in accordance with claim 1, further comprising an air-based device, and said sealing device is structured and arranged to separate two zones which are acted on with different vacuum pressures.
35. The apparatus in accordance with claim 1 in combination with an air-based device positioned within a drying section, said combination comprising:
said sealing device being positioned as an intermediate seal to separate an upper and a lower vacuum zone from each other.
36. The apparatus in accordance with claim 35, wherein said air-based device comprises a stabilizer box.
37. The apparatus in accordance with claim 35, wherein said two vacuum zones are couplable to separate vacuum sources.
38. The apparatus in accordance with claim 35, wherein said two vacuum zones are couplable to a common vacuum source.
39. The apparatus in accordance with claim 35, wherein said two vacuum zones are separately settable via flaps.
40. The apparatus in accordance with claim 35, wherein a second seal, located upstream, relative to the web travel direction, from said intermediate seal comprises one of a flexible, floating seal, a mechanical sealing strip and an air knife.
41. The apparatus in accordance with claim 35, further comprising a locking device structured and arranged to secure said sealing element from laterally slipping out of said holder.
42. The apparatus in accordance with claim 41, wherein said locking device comprises one of a cotter pin and a clamp.
43. The apparatus in accordance with claim 35, wherein said holder has a guide structured to receive said sealing element that is one of rigidly connected or in a compliant or sprung manner to said air-based device.
44. The apparatus in accordance with claim 35, wherein said sealing element comprises a camber.
45. The apparatus in accordance with claim 35, wherein said sealing element comprises at least one of plastic or metal.
46. The apparatus in accordance with claim 45, wherein the plastic comprises at least one of GRP, Teflon, CRP.
47. The apparatus in accordance with claim 35, wherein said two vacuum zones are laterally sealable via at least one of air knives and mechanical sealing plates which, in order to release said sealing element, are at least one of removable and adjustable.
48. The apparatus in accordance with claim 1, wherein said sealing element extends over an entire machine width.
49. The apparatus in accordance with claim 1, wherein said sealing element extends over only a part of a machine width or is subdivided over its width into at least two zones.
50. An apparatus for treating a fibrous web comprising:
at least one supporting surface arranged to support a surface of the fibrous web;
at least one supporting belt arranged to guide and support the fibrous web over said at least one supporting surface;
at least one sealing device positionable adjacent a surface of said at least one supporting belt opposite the surface supporting the fibrous web;
said at least one sealing device comprising a sealing element and a holder structured and arranged to hold and to enable lateral sliding movement of said at least one sealing device cross-wise to a web travel direction.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A computer implemented method for numerical calculation to analyze a fluid, comprising:
a setting step of setting conserved quantities for the fluid at time points n\u22121 and n;
a dividing step of dividing a flux of the fluid into a plurality of parts including an advection part and a pressure-dependent part, to calculate a conservative equation;
a first calculation step of calculating a value of the advection part at the time point n\u22121 using an upwind difference type leap-frog difference method based on flow velocity;
a second calculation step of calculating a value of the pressure-dependent part at the time point n using a central difference type leap-frog difference method;
a third calculation step of calculating the conserved quantity at time point n+1 based on the values of the advection part at the time point n\u22121 calculated using the upwind difference type leap-frog difference method and the pressure-dependent part at the time point n calculated using the central difference type leap-frog difference method; and
a display step of displaying a graph representing the result of the calculation in at least one of said first, second, and third calculation steps.
2. An apparatus for numerical calculation to analyze a fluid, comprising:
a setting means for setting conserved quantities for the fluid at time points n\u22121 and n;
dividing means for dividing a flux of the fluid into a plurality of parts including an advection part and a pressure-dependent part, to calculate a conservative equation,
calculation means for calculating a value of the advection part at the time point n\u22121 using an upwind difference type leap-frog difference method based on flow velocity, for calculating a value of the pressure-dependent part at the time point using n a central difference type leap-frog difference method; and calculating the conserved quantity at time point n+1 based on the values of the advection part at the time point n\u22121 calculated using the upwind difference type leap-frog difference method and the pressure-dependent part at the time point n calculated using the central difference type leap-frog method; and
a display means for displaying a graph representing the result of the calculation in at least one of said first, second, and third calculation steps.
3. A computer readable medium, storing program instructions modules that wherein executed by a computer, execute an analysis method for numerical calculation to analyze a fluid, wherein the method comprises:
setting conserved quantities for the fluid at time points n\u22121 and n;
dividing a flux of the fluid into a plurality of parts including an advection part and a pressure-dependent part, to calculate a conservative equation;
first calculating a value of the advection part at the time point n\u22121 using an upwind difference type leap-frog difference method based on flow velocity;
second calculating a value of the pressure-dependent part at the time point n using a central difference type leap-frog difference method;
third calculating the conserved quantity at time point at n+1 based on the values of the advection part at the time point n\u22121 calculated using the upwind difference type leap-frog difference method and the pressure-dependent part at the time point n calculated using the central difference type leap-frog difference method; and
displaying a graph representing the result of the calculation in at least one of said first, second, and third calculation steps.