WO2003040463A1 - An air permeable belt - Google Patents

An air permeable belt Download PDF

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Publication number
WO2003040463A1
WO2003040463A1 PCT/EP2002/012435 EP0212435W WO03040463A1 WO 2003040463 A1 WO2003040463 A1 WO 2003040463A1 EP 0212435 W EP0212435 W EP 0212435W WO 03040463 A1 WO03040463 A1 WO 03040463A1
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WO
WIPO (PCT)
Prior art keywords
air permeable
accordance
belt
permeable belt
flow barriers
Prior art date
Application number
PCT/EP2002/012435
Other languages
French (fr)
Inventor
Karl Steiner
Original Assignee
Voith Paper Patent Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Paper Patent Gmbh filed Critical Voith Paper Patent Gmbh
Publication of WO2003040463A1 publication Critical patent/WO2003040463A1/en

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0027—Screen-cloths

Definitions

  • the invention relates to an air permeable belt to support a fiber web, in particular a paper web or a board web, in a paper making machine in which this air permeable belt is at least regionally exposed to suction on its side remote from the fiber web. It further relates to a machine for the manufacture of a fiber web, in particular of a paper web or of a board web, comprising at least one such air permeable belt supporting the fiber web and to a method of manufacturing such an air permeable belt.
  • the fiber web is supported at least regionally on air permeable belts which can, for example, be screening belts, felt belts or porous conveyor belts.
  • Fig. 1 shows in a schematic part representation a conventional machine 10 for the manufacture of a fiber web, in particular of a paper web or of a board web, with a screening belt 12 first being guided over suction points 14 and subsequently over a suction lead roll 16 which are respectively arranged on the side of the screening belt 12 remote from the fiber web to be formed.
  • a first pick-up roll 18 the fiber web is taken over from the screening belt 12 by an upper felt 20 of a double felted press 22.
  • the lower felt 24 is again separated from the upper felt 20 in the region of a suction lead roll 26, with the fiber web remaining stuck to the lower felt 24.
  • the fiber web is removed from the lower felt 24, for example, by a porous conveyor belt 28, a screening belt or the like in the region of a further suction lead roll 30. It is therefore achieved by the relevant suction points 14, 16, 18, 26 and 30 that the fiber web is pulled onto the relevant air permeable belt 12, 20, 24 and 28.
  • the differential pressure ⁇ p of the surface of the air permeable belt, such as the screening belt 12, contacted by the web is lower at the edge 32 of the fiber web 34 (cf. also Figures 2 and 3) than in the centre region 36 which is generally defined by the relevant suction point; here, for example, the suction point 14 (cf. also Figs. 2 and 3).
  • the suction point 14 cf. also Figs. 2 and 3
  • dewatering is thereby less strong, which results in a stronger edge stretching at the first pick-up roll 18.
  • the tension on the fiber web 34 thereby becomes larger at the edge 32.
  • the flow barriers are preferably installed in the air permeable belt, whereby the effect of a transverse flow in the air permeable belt is correspondingly countered.
  • the flow barriers prefferably extend at least partly in the belt running direction.
  • a plurality of flow barriers can be provided in the region of a respective web edge, with a plurality of flow barriers arranged successively to one another transversely to the belt running direction preferably being provided in the region of a respect belt edge.
  • Compressible or elastic flow barriers can be provided at least in part.
  • the flow barriers can consist at least in part of polyurethane foam.
  • the flow barriers are introduced into the backing fabric of the air permeable belt from the side remote from the fiber web, with the flow barriers being able to be at least partly blown into, sucked into, woven into or needled into the backing fabric of the air permeable belt.
  • the flow barriers can also be needled into the backing fabric of the air permeable belt at least partly as nap.
  • the flow barriers provided in the region of a respective belt edge can have a mutual spacing of approximately 3 to approximately 50 mm and preferably from approximately 5 to approximately 10 mm.
  • These flow barriers preferably have a width, at least in part, from approximately 0.2 to approximately 3 mm and preferably a width of approximately ON mm.
  • the flow barriers prefferably be formed at least in part by polyfilaments woven into a monofilament.
  • the flow barriers can also be applied at least in part as a plastic material.
  • a maximum of three, in particular a maximum of two, and preferably only one flow barrier, are advantageously provided in the region of a respective web edge.
  • a flow barrier is provided in the region of a respective web edge in the region of the edge of the fiber web offset with respect to the web edge.
  • the air permeable belt can be formed, for example, by a screening belt, a felt belt, a porous conveyor belt or the like. In specific cases, it is of advantage for the flow barriers to be applied or installed at least substantially over the whole belt width.
  • Flow barriers can generally also be installed in the longitudinal direction.
  • the flow barriers are arranged obliquely, e.g. cross-wise.
  • the machine in accordance with the invention for the manufacture of a fiber web is characterized in that it includes at least one air permeable belt in accordance with the invention which supports the fiber web.
  • At least one suction point which is operated with an increased vacuum performance in the region of the flow barriers in comparison with the remaining suction region, is provided arranged on the side of the air permeable belt remote from the fiber web.
  • the air permeable belt supporting the fiber web can in particular be used in the wet section, the press section or the drying section.
  • the flow barriers are introduced into the backing fabric of the air permeable belt prior to the application of nap in particular from the side remote from the fiber web or facing the fiber web.
  • the flow barriers can at least be partly blown into, sucked into, woven into, or needled into the backing fabric of the air permeable belt.
  • the flow barriers are at least partly needled into the backing fabric of the air permeable belt as nap.
  • the flow barriers prefferably be formed at least in part by polyfilaments woven into a monofilament.
  • the flow barriers are preferably only applied in the manufacturing machine or the paper making machine.
  • the flow barriers can also be applied at least in part as a plastic material.
  • Fig. 1 a schematic part representation of a conventional machine for manufacturing a fiber web
  • Fig. 2 a schematic partly sectional representation of a suction region of the conventional machine, sectioned along the line I-I of Fig. 1;
  • Fig. 3 a schematic representation of the differential pressure in the region of the web edge and of the central region of the suction region represented in Fig. 2;
  • Fig. 4 a schematic partly sectioned representation of an air permeable belt in accordance with the invention running through a suction region with a fiber web supported thereon;
  • Fig. 5 a detailed representation of the air permeable belt in accordance with the invention shown in Fig. 4 with a fiber web supported thereon;
  • Fig. 6 a schematic partly sectioned representation of an embodiment of the air permeable belt in accordance with the invention in which the flow barriers have been needled into the backing fabric as nap;
  • Fig. 7 a schematic partly sectioned representation of an embodiment of the air permeable belt in accordance with the invention in which additional nap is introduced from the cover side or a stronger needling is provided;
  • Fig. 8 a schematic partly sectioned representation of an embodiment of the air permeable belt in accordance with the invention in which additional nap is introduced form the rear side;
  • Fig. 9 a schematic plan view of an embodiment of the air permeable belt in accordance with the invention in which a plurality of flow barriers extending in the belt running direction and arranged successively in the transverse direction are provided in the region of a respective belt edge.
  • Figs. 4 to 9 show exemplary embodiments, in a respective schematic representation, of an air permeable belt 38 in accordance with the invention by which a fiber web 40, in particular a paper web or a board web, is supported.
  • the air permeable belt 38 can in particular be a screening belt, a felt belt or a porous conveyor belt which can be used in a manufacturing machine or in a paper making machine and which is at least regionally exposed to suction on its side remote from the fiber web 40 in the relevant manufacturing machine or paper making machine.
  • suction points can, for example, be provided - among others - as are represented in Fig. 1.
  • Flow barriers 44 are provided in the region of the belt edges and counter the effect of an air flow extending transversely to the belt running direction L. The pressures at the edge are thereby correspondingly increased.
  • a vacuum is generated in a central region defined by a suction point or a suction device 46.
  • a transverse flow in the region of the belt edge 42 is now prevented by the flow barriers 44, whereby the pressure at the edge is correspondingly increased (cf. also Fig. 5).
  • the flow barriers 44 can be installed in the air permeable belt 38.
  • the flow barriers 44 can extend at least partly in the belt running direction L (cf . in particular Fig. 9) .
  • a plurality of such flow barriers 44 can be provided in the region of a respec- tive belt edge 42.
  • these flow barriers 44 are arranged successively transversely to the belt running direction L.
  • Compressible or elastic flow barriers 44 can be provided at least in part.
  • the flow barriers 44 can, for example, consist at least in part of polyurethane foam.
  • the flow barriers can be introduced - before the nap application - into the backing fabric of the permeable belt 38 e.g. from the side remote from the fiber web 40, with the flow barriers 44, for example, being blown into, sucked into, woven into or needled into the backing fabric of the air permeable belt 38.
  • the flow barriers 44 can be needled into the backing fabric of the air permeable belt 38 at least partly as nap.
  • additional nap can be introduced, for example from the cover side, or a stronger needling can be provided to, for example, a width of approximately 1 to approximately 2 mm.
  • additional nap can also be introduced, for example, from the rear side to form the flow barriers 44.
  • the flow barriers 44 provided in the region of a respective belt edge 42 can have a mutual spacing from, for example, approximately 3 to approximately 50 mm, and preferably from approximately 5 to approximately 10 mm (cf., for example, Fig. 9).
  • the flow barriers 44 can at least partly have a width b from, for example, approximately 0.2 to approximately 3 mm, and preferably a width from approximately 0.7 mm (cf. in particular Fig. 9 again).
  • the flow barriers 44 can in particular also be formed at least in part by polyfilaments woven into a monofilament.
  • the flow barriers 44 prefferably be applied only in the manufacturing machine or the paper making machine.
  • the flow barriers 44 can be expedient in certain cases for the flow barriers 44 to be applied at least in part as a plastic material.
  • edge barrier 44 Only a few or only one edge barrier 44 is preferably provided. For instance, in the region of a respected belt edge 44, a maximum of three, in particular a maximum of two, and preferably only one flow barrier 44, are advantageously provided.
  • a flow barrier 44 can be provided in the region of a respective belt edge 42 in the region of the edge 48 of the fiber web 40 offset with respect to the belt edge 42.
  • the width of the fiber web 40 (cf., for example, Fig. 4) is specified as "B".
  • the air permeable belt 38 can, for example, be a screening belt, a felt belt or a porous conveyor belt.
  • the relevant suction point 46 (cf., e.g. Fig. 4) can be exposed to an increased vacuum in the region of the flow barriers 44 in comparison with the remaining suction region.
  • the air permeable belt 38 supporting the fiber web 40 can be used in particular in the wet part, in the pressing part or in the drying part of the relevant manufacturing machine or paper making machine.
  • suction device 46 suction point, suction device

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  • Paper (AREA)

Abstract

An air permeable belt (38) serves for the support of a fiber web (40) , in particular of a paper web or of a board web, in a paper making machine in which it is exposed to suction at least regionally on its side remote from the fiber web. Flow barriers (44) are provided in the region of the belt edges (42) which counter the effect of an air flow extending transversely to the belt running direction.

Description

An air permeable belt
The invention relates to an air permeable belt to support a fiber web, in particular a paper web or a board web, in a paper making machine in which this air permeable belt is at least regionally exposed to suction on its side remote from the fiber web. It further relates to a machine for the manufacture of a fiber web, in particular of a paper web or of a board web, comprising at least one such air permeable belt supporting the fiber web and to a method of manufacturing such an air permeable belt.
In a machine for the manufacture of a fiber web, in particular a paper web or a board web, the fiber web is supported at least regionally on air permeable belts which can, for example, be screening belts, felt belts or porous conveyor belts.
Fig. 1 shows in a schematic part representation a conventional machine 10 for the manufacture of a fiber web, in particular of a paper web or of a board web, with a screening belt 12 first being guided over suction points 14 and subsequently over a suction lead roll 16 which are respectively arranged on the side of the screening belt 12 remote from the fiber web to be formed. In the region of a first pick-up roll 18, the fiber web is taken over from the screening belt 12 by an upper felt 20 of a double felted press 22. Subsequent to the press 22, the lower felt 24 is again separated from the upper felt 20 in the region of a suction lead roll 26, with the fiber web remaining stuck to the lower felt 24. Subsequent to this, the fiber web is removed from the lower felt 24, for example, by a porous conveyor belt 28, a screening belt or the like in the region of a further suction lead roll 30. It is therefore achieved by the relevant suction points 14, 16, 18, 26 and 30 that the fiber web is pulled onto the relevant air permeable belt 12, 20, 24 and 28.
Since, in the relevant air permeable belt, air also flow transversely to the respective belt running direction L, the differential pressure Δp of the surface of the air permeable belt, such as the screening belt 12, contacted by the web is lower at the edge 32 of the fiber web 34 (cf. also Figures 2 and 3) than in the centre region 36 which is generally defined by the relevant suction point; here, for example, the suction point 14 (cf. also Figs. 2 and 3). In the screen section of the web edge 32, dewatering is thereby less strong, which results in a stronger edge stretching at the first pick-up roll 18. The tension on the fiber web 34 thereby becomes larger at the edge 32. Less good a transfer takes place at suction felt rollers (cf., for example, the suction rolls 18 and 26 in Fig. 1) due to the lower edge pressure of the web edge. In the drying section, the web edge is held less well at the edge by the drying screen suction roll, which has the result of increased tension and of an over- stretching of the edge.
It is known to protect drying screens against mechanical damage at the edge with PU (polyurethane) .
It is the aim of the invention to further develop the air permeable belt, the machine and the method of the kind initially named to eliminate the previously recited disadvantages. In this connection, in particular an improved adhesion of the web edges to the respective support belt should also be achieved in the region of the suction points. With respect to the air permeable belt, this object is satisfied in that flow barriers are provided in the region of the web edges which counter the effect of an air flow running transversely to the belt running direction.
It is in particular achieved on the basis of this design that the pressures are increased in the region of the web edges, whereby the adhesion of the web edges to the respective air permeable belt is increased accordingly.
The flow barriers are preferably installed in the air permeable belt, whereby the effect of a transverse flow in the air permeable belt is correspondingly countered.
It is also of advantage for the flow barriers to extend at least partly in the belt running direction.
A plurality of flow barriers can be provided in the region of a respective web edge, with a plurality of flow barriers arranged successively to one another transversely to the belt running direction preferably being provided in the region of a respect belt edge.
Compressible or elastic flow barriers can be provided at least in part.
The flow barriers can consist at least in part of polyurethane foam.
In a preferred practical embodiment of the air permeable belt in accordance with the invention, the flow barriers are introduced into the backing fabric of the air permeable belt from the side remote from the fiber web, with the flow barriers being able to be at least partly blown into, sucked into, woven into or needled into the backing fabric of the air permeable belt. The flow barriers can also be needled into the backing fabric of the air permeable belt at least partly as nap.
The flow barriers provided in the region of a respective belt edge can have a mutual spacing of approximately 3 to approximately 50 mm and preferably from approximately 5 to approximately 10 mm.
These flow barriers preferably have a width, at least in part, from approximately 0.2 to approximately 3 mm and preferably a width of approximately ON mm.
It is also of advantage for the flow barriers to be formed at least in part by polyfilaments woven into a monofilament.
The flow barriers can also be applied at least in part as a plastic material.
A maximum of three, in particular a maximum of two, and preferably only one flow barrier, are advantageously provided in the region of a respective web edge.
In a preferred practical embodiment of the air permeable belt in accordance with the invention, a flow barrier is provided in the region of a respective web edge in the region of the edge of the fiber web offset with respect to the web edge.
The air permeable belt can be formed, for example, by a screening belt, a felt belt, a porous conveyor belt or the like. In specific cases, it is of advantage for the flow barriers to be applied or installed at least substantially over the whole belt width.
Flow barriers can generally also be installed in the longitudinal direction.
In an expedient practical embodiment of the air permeable belt in accordance with the invention, the flow barriers are arranged obliquely, e.g. cross-wise.
The machine in accordance with the invention for the manufacture of a fiber web, in particular of a paper web or of a board web, is characterized in that it includes at least one air permeable belt in accordance with the invention which supports the fiber web.
In accordance with a preferred practical embodiment of the machine in accordance with the invention, at least one suction point, which is operated with an increased vacuum performance in the region of the flow barriers in comparison with the remaining suction region, is provided arranged on the side of the air permeable belt remote from the fiber web.
The air permeable belt supporting the fiber web can in particular be used in the wet section, the press section or the drying section.
In a preferred method of manufacturing the air permeable belt in accordance with the invention, the flow barriers are introduced into the backing fabric of the air permeable belt prior to the application of nap in particular from the side remote from the fiber web or facing the fiber web. In this connection, the flow barriers can at least be partly blown into, sucked into, woven into, or needled into the backing fabric of the air permeable belt. In accordance with an advantageous embodiment of the method in accordance with the invention, the flow barriers are at least partly needled into the backing fabric of the air permeable belt as nap.
It is also of advantage for the flow barriers to be formed at least in part by polyfilaments woven into a monofilament.
The flow barriers are preferably only applied in the manufacturing machine or the paper making machine.
In accordance with a further expedient embodiment of the method, the flow barriers can also be applied at least in part as a plastic material.
Further advantageous embodiments of the method in accordance with the invention are recited in the dependent claims.
The invention will be described in more detail with reference to embodiments and to the drawing, in which are shown:
Fig. 1 a schematic part representation of a conventional machine for manufacturing a fiber web;
Fig. 2 a schematic partly sectional representation of a suction region of the conventional machine, sectioned along the line I-I of Fig. 1;
Fig. 3 a schematic representation of the differential pressure in the region of the web edge and of the central region of the suction region represented in Fig. 2; Fig. 4 a schematic partly sectioned representation of an air permeable belt in accordance with the invention running through a suction region with a fiber web supported thereon;
Fig. 5 a detailed representation of the air permeable belt in accordance with the invention shown in Fig. 4 with a fiber web supported thereon;
Fig. 6 a schematic partly sectioned representation of an embodiment of the air permeable belt in accordance with the invention in which the flow barriers have been needled into the backing fabric as nap;
Fig. 7 a schematic partly sectioned representation of an embodiment of the air permeable belt in accordance with the invention in which additional nap is introduced from the cover side or a stronger needling is provided;
Fig. 8 a schematic partly sectioned representation of an embodiment of the air permeable belt in accordance with the invention in which additional nap is introduced form the rear side; and
Fig. 9 a schematic plan view of an embodiment of the air permeable belt in accordance with the invention in which a plurality of flow barriers extending in the belt running direction and arranged successively in the transverse direction are provided in the region of a respective belt edge. Figs. 4 to 9 show exemplary embodiments, in a respective schematic representation, of an air permeable belt 38 in accordance with the invention by which a fiber web 40, in particular a paper web or a board web, is supported. The air permeable belt 38 can in particular be a screening belt, a felt belt or a porous conveyor belt which can be used in a manufacturing machine or in a paper making machine and which is at least regionally exposed to suction on its side remote from the fiber web 40 in the relevant manufacturing machine or paper making machine. In this connection, such suction points can, for example, be provided - among others - as are represented in Fig. 1.
Flow barriers 44 are provided in the region of the belt edges and counter the effect of an air flow extending transversely to the belt running direction L. The pressures at the edge are thereby correspondingly increased.
As can be recognized, for example, with reference to Fig. 4, a vacuum is generated in a central region defined by a suction point or a suction device 46. A transverse flow in the region of the belt edge 42 is now prevented by the flow barriers 44, whereby the pressure at the edge is correspondingly increased (cf. also Fig. 5).
As can in particular be recognized with reference to Figs. 4 and 5, the flow barriers 44 can be installed in the air permeable belt 38.
The flow barriers 44 can extend at least partly in the belt running direction L (cf . in particular Fig. 9) .
As can be recognized in particular with reference to Figs. 4, 5 and 9, a plurality of such flow barriers 44 can be provided in the region of a respec- tive belt edge 42. In accordance with Figs. 4, 5 and 9, these flow barriers 44 are arranged successively transversely to the belt running direction L.
Compressible or elastic flow barriers 44 can be provided at least in part.
The flow barriers 44 can, for example, consist at least in part of polyurethane foam.
As can be recognized, for example, with reference to Fig. 8, the flow barriers can be introduced - before the nap application - into the backing fabric of the permeable belt 38 e.g. from the side remote from the fiber web 40, with the flow barriers 44, for example, being blown into, sucked into, woven into or needled into the backing fabric of the air permeable belt 38.
In accordance with Figs. 6 to 8, the flow barriers 44 can be needled into the backing fabric of the air permeable belt 38 at least partly as nap.
In accordance with Fig. 7, to form the flow barriers 44, additional nap can be introduced, for example from the cover side, or a stronger needling can be provided to, for example, a width of approximately 1 to approximately 2 mm. As can be recognized, for example, with reference to Fig. 8, additional nap can also be introduced, for example, from the rear side to form the flow barriers 44.
The flow barriers 44 provided in the region of a respective belt edge 42 can have a mutual spacing from, for example, approximately 3 to approximately 50 mm, and preferably from approximately 5 to approximately 10 mm (cf., for example, Fig. 9). The flow barriers 44 can at least partly have a width b from, for example, approximately 0.2 to approximately 3 mm, and preferably a width from approximately 0.7 mm (cf. in particular Fig. 9 again).
The flow barriers 44 can in particular also be formed at least in part by polyfilaments woven into a monofilament.
It is in particular also possible for the flow barriers 44 to be applied only in the manufacturing machine or the paper making machine.
It can be expedient in certain cases for the flow barriers 44 to be applied at least in part as a plastic material.
Only a few or only one edge barrier 44 is preferably provided. For instance, in the region of a respected belt edge 44, a maximum of three, in particular a maximum of two, and preferably only one flow barrier 44, are advantageously provided.
As results in particular from Fig. 9, a flow barrier 44 can be provided in the region of a respective belt edge 42 in the region of the edge 48 of the fiber web 40 offset with respect to the belt edge 42. In Fig. 9, the width of the fiber web 40 (cf., for example, Fig. 4) is specified as "B".
As already mentioned, the air permeable belt 38 can, for example, be a screening belt, a felt belt or a porous conveyor belt.
The relevant suction point 46 (cf., e.g. Fig. 4) can be exposed to an increased vacuum in the region of the flow barriers 44 in comparison with the remaining suction region. The air permeable belt 38 supporting the fiber web 40 can be used in particular in the wet part, in the pressing part or in the drying part of the relevant manufacturing machine or paper making machine.
Reference numeral list
10 manufacturing machine or paper making machine
12 screening belt
14 suction point
16 suction lead roll
18 pick-up roll
20 upper felt
22 press
24 lower felt
26 suction lead roll
28 porous conveyor belt
30 suction lead roll
32 web edge
34 fiber web
36 central region
38 air permeable belt Band
40 fiber web
42 belt edge
44 flow barrier
46 suction point, suction device
48 edge of the fiber web
B width of the fiber web
L belt running direction b barrier width d barrier spacing

Claims

Claims
1. An air permeable belt (38) for the support of a fiber web (40), in particular of a paper web or of a board web, in a paper making machine, in which this air permeable belt (38) is at least regionally exposed to suction on its side remote from the fiber web (40), characterized in that flow barriers (44) are provided in the region of the web edges (42) which counter the effect of an air flow extending transversely to the belt running direction (L) .
2. An air permeable belt in accordance with claim 1, characterized in that the flow barriers (44) are installed in the air permeable belt (38).
3. An air permeable belt in accordance with claim 1 or claim 2, characterized in that the flow barriers (44) extend at least partly in the belt running direction (L) .
4. An air permeable belt in accordance with any one of the preceding claims, characterized in that a plurality of flow barriers (44) are provided in the region of a respective belt edge (42).
5. An air permeable belt in accordance with claim 4, characterized in that a plurality of flow barriers (44) arranged successively transversely to the belt running direction (L) are provided in the region of a respective belt edge (42).
6. An air permeable belt in accordance with any one of the preceding claims, characterized in that at least partly compressible or elastic flow barriers (44) are provided.
7. An air permeable belt in accordance with any one of the preceding claims, characterized in that the flow barriers (44) consist at least in part of polyurethane foam.
8. An air permeable belt in accordance with any one of the preceding claims, characterized in that the flow barriers (44) are introduced into the backing fabric of the air permeable belt (38) from the side remote from the fiber web (40) .
9. An air permeable belt in accordance with claim 8, characterized in that the flow barriers (44) are at least partly blown into, sucked into, woven into or needled into the backing fabric of the air permeable belt (38).
10. An air permeable belt in accordance with any one of the preceding claims, characterized in that the flow barriers (44) are at least partly needled into the backing fabric of the air permeable belt (38) as nap.
11. An air permeable belt in accordance with any one of the preceding claims, characterized in that the flow barriers (44) provided in the region of a respective belt edge (42) have a mutual spacing (d) from approximately 3 to approximately 50 mm and preferably from approximately 5 to approximately 10 mm.
12. An air permeable belt in accordance with any one of the preceding claims, characterized in that the flow barriers (44) at least partly have a width (b) from approximately 0.2 to approximately 3 mm and preferably a width of approximately 0.7 mm.
13. An air permeable belt in accordance with any one of the preceding claims, characterized in that the flow barriers (44) are at least partly formed by polyfilaments woven into a monofilament.
14. An air permeable belt in accordance with any one of the preceding claims, characterized in that the flow barriers (44) are at least partly applied as a plastic material.
15. An air permeable belt in accordance with any one of the preceding claims, characterized in that a maximum of three, in particular a maximum of two, and preferably only one flow barrier (44) is provided in the region of a respective belt edge.
16. An air permeable belt in accordance with any one of the preceding claims, characterized in that, in the region of a respective belt edge (42), a flow barrier (44) is provided in the region of the edge (48) of the fiber web (40) offset with respect to the belt edge (42).
17. An air permeable belt in accordance with any one of the preceding claims, characterized in that it is formed by a screening belt.
18. An air permeable belt in accordance with any one of claims 1 to 16, characterized in that it is formed by a felt belt.
19. An air permeable belt in accordance with any one of the preceding claims, characterized in that it is formed by a porous conveyor belt.
20. An air permeable belt in accordance with any one of the preceding claims, characterized in that the flow barriers (44) are applied or introduced at least substantially over the whole belt width.
21. An air permeable belt in accordance with any one of the preceding claims, characterized in that flow barriers are also installed in the longitudinal direction.
22. An air permeable belt in accordance with any one of the preceding claims, characterized in that the flow barriers (44) are arranged obliquely, e.g. cross-wise.
23. A machine for the manufacture of a fiber web (40), in particular of a paper web or of a board web, comprising at least one air permeable belt (38) in accordance with any one of the preceding claims supporting the fiber web (40) .
24. A machine in accordance with claim 23, characterized in that at least one suction point (46) arranged on the side of the air permeable belt remote from the fiber web (40) is provided and is operated in the region of the flow barriers (44) with a vacuum performance increased in comparison with the remaining suction region.
25. A machine in accordance with claim 23 or claim 24, characterized in that the air permeable belt (38) supporting the fiber web (40) is used in the wet section.
26. A machine in accordance with claim 23 or claim 24, characterized in that the air permeable belt (38) supporting the fiber web (40) is used in the pressing section.
27. A machine in accordance with claim 23 or claim 24, characterized in that the air permeable belt (38) supporting the fiber web (40) is used in the drying section. .
28. A method of manufacturing an air permeable belt in accordance with any one of claims 1 to 22, characterized in that the flow barriers (44) are introduced, before the application of nap, into the backing fabric of the air permeable belt (38) in particular from the side remote from the fiber web (40) or facing the fiber web (40).
29. A method in accordance with claim 28, characterized in that the flow barriers (44) are at least partly blown into, sucked into, woven into or needled into the backing fabric of the air permeable belt (38) .
30. A method in accordance with claim 28 or claim 29, characterized in that the flow barriers (44) are at least partly needled into the backing fabric of the air permeable belt (38) as nap.
31. A method in accordance with any one of the preceding claims, characterized in that the flow barriers (44) are formed at least in part by polyfilaments woven into a monofilament.
32. A method in accordance with any one of the preceding claims, characterized in that the flow barriers (44) are only applied in the manufacturing machine or in the paper making machine.
33. A method in accordance with any one of the preceding claims, characterized in that the flow barriers (44) are applied at least in part as a plastic material.
34. A method in accordance with any one of the preceding claims, characterized in that the flow barriers (44) are applied or introduced at least substantially over the whole belt width.
35. A method in accordance with any one of the preceding claims, characterized in that flow barriers are also installed in the longitudinal direction.
36. A method in accordance with any one of the preceding claims, characterized in that the flow barriers (44) are arranged obliquely, e.g. cross-wise.
PCT/EP2002/012435 2001-11-09 2002-11-07 An air permeable belt WO2003040463A1 (en)

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DE2001155046 DE10155046A1 (en) 2001-11-09 2001-11-09 Breathable tape

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Citations (2)

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US5422166A (en) * 1993-02-12 1995-06-06 Wangner Systems Corporation Abrasion resisting edge for a forming fabric
US5731059A (en) * 1993-04-07 1998-03-24 Wangner Systems Corporation Dryer fabric having an abrasion resistant edge

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Publication number Priority date Publication date Assignee Title
AT358913B (en) * 1978-05-30 1980-10-10 Hutter & Schrantz Ag SCREEN FOR PAPER MACHINES
DE3141474A1 (en) * 1981-10-20 1983-05-05 GKD Gebr. Kufferath GmbH & Co KG, 5160 Düren Wire-fabric tape
DE3909534A1 (en) * 1989-03-22 1990-09-27 Oberdorfer Fa F FORMING SCREEN FOR THE WET SECTION OF A PAPER MACHINE
DE19704145A1 (en) * 1997-02-04 1998-08-06 Voith Sulzer Papiermasch Gmbh Paper-making machine blanket
DE19941334A1 (en) * 1999-08-31 2001-03-01 Voith Paper Patent Gmbh Machine for the production and / or treatment of a material web

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Publication number Priority date Publication date Assignee Title
US5422166A (en) * 1993-02-12 1995-06-06 Wangner Systems Corporation Abrasion resisting edge for a forming fabric
US5731059A (en) * 1993-04-07 1998-03-24 Wangner Systems Corporation Dryer fabric having an abrasion resistant edge

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