Device for transporting and / or deflecting a carpet of material

Abstract

The invention relates to a device for transporting and / or deflecting a carpet of material, preferably in the course of drying the carpet of material (7) in a housing (10) of a dryer (11), comprising at least two endless belts (1, 2, 3) guided over rollers (5), for transporting the carpet of material (7), wherein a transport region (6) for the carpet of material (7) is arranged at least partially along a circumference of a drum (4), wherein the drum (4) and / or at least one of the belts are arranged in the transport region (6) on the two faces (8) of the carpet of material (7) for guiding and / or sealing the carpet of material (7), and wherein guiding and / or sealing elements are arranged at least in the transport region (6) on the two long sides (9) of the carpet of material (7). The guiding and / or sealing elements 1645 can be implemented independently, operatively connected to the drum (4), or on the belts (2, 3).

Description

[0001] DEVICE FOR TRANSPORT AND / OR

[0002] DEFLECTION OF A MATERIAL CARPET

[0003] The invention relates to a device for transporting and / or deflecting a carpet of material, preferably during the drying of the carpet of material, according to the preamble of patent claim 1.

[0004] Such devices are used industrially to convey material or material carpets or to divert them in a controlled manner within a controlled environment, preferably by holding them at the surfaces. The material, or a material carpet formed from it, can be homogeneous or viscoelastic in structure. However, free-flowing materials, such as biomass in various forms, peat, wood chips, shavings, and pellets, are also conveyed with such devices.

[0005] Particularly well-known are devices for drying materials or a carpet of material, which form a carpet of material on a conveyor belt and guide it through a dryer housing. The material or carpet of material can also be guided and dried over several levels. Examples of drying devices operate with hot air, convection heaters, electromagnetic waves, or a combination of the above.

[0006] Examples of such belt dryers are known from the following publications: CH 381612 A, DE 684922A, DE1971991 U, DE2441787C2, DE 4301993A1 , DE 102016014642A1 or EP3467179A1 .

[0007] As a rule, the material or carpet of material is dropped from an overhead conveyor belt onto a conveyor belt below and thus guided in the dryer housing for an extended period of time. This design is space-saving and effective. However, it may also be desired that the material is guided and diverted in a controlled manner or transferred from one conveyor belt to another at different heights, for example from top to bottom or bottom to top. In this case, the material or carpet of material is usually clamped between two conveyor belts at their flat sides and diverted along a curve, for example a drum or roller. With larger drum radii, this requires gentle diversion for the material composite or even the overcoming of a significant height difference.

[0008] In the course of the production of material boards, chips, wood chips, fibers, other biomass, waste wood particles or the like are dried on a large industrial scale in such belt dryers before they are glued with a binder and pressed into material boards in a press and cured by means of pressure and / or heat.

[0009] The object of the present invention is to provide a device for transporting and / or deflecting material or material carpet lying on a conveyor belt, preferably during drying in a dryer, which device is to enable problem-free, gentle and contamination-free deflection of the material or material carpet.

[0010] In addition, in an extension of the task, the start-up and shut-down operation of the device is advantageously facilitated and / or the risk of contamination and fire in the device is reduced.

[0011] The solution to the problem lies in the device in the combination of the features according to claim 1. The device for transporting and / or deflecting a material carpet, preferably during the drying of the material carpet in a housing of a dryer, has at least two endless belts guided over rollers for transporting the material carpet, wherein a transport area for the material carpet is arranged at least partially along a circumference of a drum, wherein the drum and / or at least one of the belts is arranged in the transport area for guiding and / or sealing the material carpet on the two surface sides of the material carpet and wherein guiding and / or sealing elements are arranged at least in the transport area on the two longitudinal sides of the material carpet.

[0012] The invention distinguishes between the deflection and / or guidance of the belts for transporting the material between a drum and a roller. A drum or a roller are generally suitable for deflecting a belt at their partial circumference, with the material lying directly or indirectly (via a conveyor belt) against the drum / roller. The use of the semantics is intended to highlight the usually larger diameter of a drum compared to rollers, although identical diameters also seem suitable. A transport area for the material or the material carpet will form on the circumference, thus enabling gentle transport and / or overcoming significant height differences. The transport area comprises a predetermined volume or a cross-section to the running direction, which can be variable depending on the type of material or throughput, in which volume the material or the material carpet is guided and held.Friction-increasing elements, such as ribs or rough surfaces, can be arranged on the surface of the drum, a belt, or a moving guide or sealing element to prevent uncontrolled sliding of the material or material carpet, especially when free-flowing material is intended to form a material carpet. This advantageously optimizes start-up and shut-down operations. During start-up, blockages or backflow are avoided, and during shut-down, it is ensured that the material completely leaves the device.

[0013] The guiding or sealing elements can be implemented in various ways, either in combination or alternatively. In addition to circumferential or statically arranged walls on the longitudinal sides of the belt, lateral guiding or sealing elements can also be provided through structural modifications to the drum and / or the belts. Adjustable, adjustable, adaptable, or the like, within the meaning of the invention, generally also includes the necessary actuators to provide these movements, as well as corresponding control or regulation systems to ensure the belt path as well as the sealing or guiding effect of the corresponding machine elements.

[0014] In the preferred embodiment, a conveyor belt fixes or clamps the material carpet or material to the circumference of the drum, thus ensuring sufficient friction during the deflection along the transport area. In another embodiment of the device, the material carpet is guided between two belts around a deflection point. This deflection point is preferably designed in the form of a cylindrical drum around which a belt rotates. Depending on the embodiment, the cylindrical drum can also be realized by other elements supporting the belts.

[0015] The invention has the following advantages over the prior art:

[0016] - In addition to guiding the surface sides, the longitudinal sides of the material carpet or the material are guided and preferably guided essentially unchanged around the deflection or a height difference; - In the case of homogeneous surfaces, cracks, cavities, or breakouts at the edges of the material carpet are avoided;

[0017] - The degree of contamination of the device during a preferred 24 / 7 production is significantly reduced, in particular by avoiding material failure when redirecting the material;

[0018] - the start-up and shut-down operation is significantly simplified, backlogs or residues in the transport area are avoided, with advantages for the operational reliability of the device in continuous or alternating operation;

[0019] - this also simplifies production changes based on the material type;

[0020] - Through the targeted arrangement of the guide or sealing elements, possible areas for contamination in the housing can be localized or arranged in a targeted manner. This enables simplified maintenance or the arrangement of fewer or smaller devices for the disposal of contamination.

[0021] The following features or embodiments constitute further advantageous embodiments of the invention and can be combined as desired, provided that this is technically feasible.

[0022] Particularly preferably, walls are arranged as guide and / or sealing elements for or along the longitudinal sides of the material carpet and / or adjacent to the longitudinal sides of the belts at an angle to the circumference of the drum. The walls can be arranged statically or circumferentially and are preferably arranged so as to be movable and / or adjustable independently of the drum or belts.

[0023] In this context, it may be advantageous if the walls are arranged as discs on the drum, see Figure 6.

[0024] The walls can also be geometrically adapted, for example, curved or otherwise shaped as desired. Alternatively or additionally, a groove can also be provided on the drum in which the side walls are formed. The drum can then preferably also be suitable for guiding at least one or both belts. Advantageously, the belt adjacent to the drum is guided through the groove, while the outer belt covers the groove of the drum (see Fig. 5).

[0025] Alternatively, as shown in Figure 5, it is also conceivable for the adjacent belt to adapt to the groove or shape of the drum, protruding from the groove area at the longitudinal edges, and thus coming into contact with the other outer belt on the outside of the drum. In other words, the first belt adjacent to the drum forms the pocket or indentation, while the outer belt covers it and more or less retains the material in the pocket.

[0026] It may be useful to provide friction-enhancing means or conveying elements, preferably rough or irregular surfaces for the material carpet, on the surrounding walls or similar machine elements (the side walls of a groove) and / or on the flat sides of the belts. Such belts, walls, or drum surfaces, which form a static hollow space, can be particularly useful for transporting individual material or parts of the material carpet during start-up and shut-down operations.

[0027] Alternatively or additionally, the walls and / or the drum can be arranged to be axially displaceable along the drum axis. Preferably, the walls and / or the drum are pre-tensioned relative to the belts or the material carpet by actuators and / or a preferably predetermined spring force (see Fig. 2 and Fig. 3).

[0028] Alternatively, or with a cumulative effect, the walls can be guided in a groove on the circumference of the drum. The groove is preferably formed such that the base of the groove is radially offset from the plane of the belt path on the circumference of the drum or has a different radius from the drum axis.

[0029] In addition, it is also conceivable for a machine element to be arranged on the walls, aligned axially with the drum and undercutting at least one belt. Particularly preferably, it is provided that, when the belt rests against the drum, a predetermined area of ​​the belt is not supported on the belt's longitudinal sides due to the groove, and the machine element engages here, preferably in a sealing manner in operative connection with the lateral wall. Advantageously, the machine element can be designed to be displaceable along the drum's rotational axis together with the wall in order to compensate for the belt's path if necessary (see Figure 2).

[0030] It is particularly preferred that the wall is provided with two machine elements that undercut the various belts, wherein the machine elements guide or fix the belts on the outside and the lateral wall seals off and prevents material or parts of the material carpet from escaping from the transport area.

[0031] It can be provided that the side wall has a projection that engages between the bands or guides and / or seals the bands on the long sides of the band.

[0032] In an alternative embodiment, which can also be implemented in combination, at least one of the belts can be designed to be flexible or stretchable at least partially across the width of the material carpet in order to receive and / or envelop the material carpet. The two belts together then act similarly to a hose conveyor and advantageously adapt to different heights of the material or the material carpet. It can be provided that at least the longitudinal side of the belt or an outer region along the longitudinal side of the belt is designed to be comparatively stiff compared to the flexible or stretchable region. The stiffer outer region of the belt serves as a guide or sealing element and rests against the drum and / or walls and / or edge elements before or at the beginning of the transport area, while the material carpet deforms the outer belt quasi-elastically across the remaining width of the belt and holds or supports it.

[0033] Instead of the walls formed on the drum, edge elements can also be provided which are not part of the drum.

[0034] In a physical reversal and depending on the type of material or material carpet, at least a predetermined area of ​​the belt's longitudinal side can be flexible or stretchable, while the remaining area of ​​the belt can be comparatively stiff across the width compared to the belt's longitudinal side. Advantageously, the surface of the material carpet is supported comparatively better than in the previous variant, and the surface of the material carpet is guided more gently and statically more evenly, while the flexible lateral areas are applied to the other belt and serve as a guide or sealing element.

[0035] Advantageously, a cambered drum 4 and / or a circumferential groove can be arranged on the drum as a guide and / or sealing element for at least partially receiving a belt and / or the material carpet. In a particularly preferred embodiment, the inner belt guided in the groove can be omitted. The outer belt can either dip into the groove and press the material carpet into the groove of the drum or overlap the groove and serve as a cover, see Figure 5. In a particularly advantageous manner, flexible belts, in particular with different strengths and / or flexibility across the width of the belt, can be combined with this exemplary embodiment.

[0036] In the following features (A12-14) the guide and sealing elements are combined with the belts or attached to the belts.

[0037] For this purpose, it can be provided that a side wall protruding at an angle from the flat side and / or a raised portion for guiding or sealing the long side of the material carpet is arranged as a guiding and / or sealing element on a long side of the belt on at least one of the belts. These side walls or raised portions, which are connected to or integrated with the belts and depending on the belt design or type, have the advantage that they can exert a guiding or sealing effect on the long side of a material carpet along the entire belt run along the running direction when a material or material carpet is resting on them.

[0038] With this independent and sensible design of the belts, the entire transport area can be advantageously designed in such a way that no material or parts of the material carpet leave the belt due to the conveying effect. To achieve this, the raised section or side wall on the longitudinal side of the belt does not even have to represent the entire height of the material carpet; rather, a smaller height can achieve the inventive effect.

[0039] In this context, the side wall or the elevation can be designed with one or more tracks along the running direction and / or in one or more pieces and / or interrupted in sections, see Figs. 7 to 9.

[0040] Depending on the type of conveyor belt, which is subject to particular stresses, particularly during drying at high temperatures or possibly over longer travel distances and deflections, it may be necessary to limit the required height of the side wall as much as possible or to ensure appropriate geometric designs for the belt circulation in order to reduce, for example, the notch effect, stresses or torsions.

[0041] Alternatively, it may be advisable to offset the side walls across the width of two belts and / or axially to the drum, at least in the transport area, with undercuts and / or contact. By protruding walls / elevations from two opposing belts, lower heights can be achieved while simultaneously achieving optimal sealing or guiding properties.

[0042] It can be provided that a device for compressing the longitudinal sides of the material carpet or displacing them axially inward toward the drum is arranged in the inlet and / or outlet areas of the transport area around the drum. This advantageously ensures that the material or material carpet is located behind the guide or sealing elements in the transport area.

[0043] Alternatively or additionally, it can be provided that guide walls are arranged in the inlet and / or outlet areas for the long sides of the material carpet and / or on the belts, and these are preferably designed to be movable and / or aligned transversely to the direction of travel of the material carpet. These guide walls are intended to enable a gentle or targeted transition of the material carpet into or out of the transport area.

[0044] Alternatively or cumulatively, the spacing of the walls and / or guide walls in the inlet area, the outlet area, and / or the transport area can be different in and / or across the running direction. It is particularly preferred that these walls overlap in the running direction at the adjacent areas or have gentle transitions when these walls come into contact with the long sides of the material carpet.

[0045] Furthermore, it can be provided that collection or suction devices are arranged at significant points or positions or areas in the direction of travel of the material or belt, which collect or dispose of material falling out at transitions between the belts, walls, and guide walls. By limiting the potential contamination areas to a few locations, greater operational reliability can also be achieved. Maintenance openings for manual cleaning are preferably also provided in the housing at these areas.

[0046] Further advantageous measures and embodiments of the subject matter of the invention emerge from the subclaims and the following description with the schematic drawing.

[0047] Further advantageous measures and embodiments of the subject matter of the invention emerge from the subclaims and the following description with the drawing.

[0048] They show:

[0049] Figure 1 shows a schematic side view of a device for transporting and / or deflecting a material carpet in a transport area along a drum shown significantly enlarged during the exemplary drying of the material carpet in a housing of a dryer,

[0050] Figure 2 shows a schematic sectional view of the transport area with the running direction of the belts perpendicular to the plane of the drawing and depicting a first embodiment of independent guide and sealing elements, Figure 3 shows a similar schematic sectional view with a further embodiment of the guide and sealing elements in the transport area,

[0051] Figure 4 is a similar schematic sectional view with a further embodiment of the guide and sealing elements realized on the bands,

[0052] Figure 5 is a similar schematic sectional view with a further embodiment of the guide and sealing elements realized on the drum,

[0053] Figure 6 is a similar schematic sectional view with a further embodiment of the guide and sealing elements realized on the drum,

[0054] Figure 7 is a similar schematic sectional view with a further embodiment of the guide and sealing elements realized on the bands,

[0055] Figure 8 shows a more detailed embodiment of the guide and sealing elements realized on a belt in a schematic side view and

[0056] Figure 9 shows the embodiment according to Figure 8 in a schematic sectional view with the running direction of the belts perpendicular to the plane of the drawing.

[0057] The drawing according to Figure 1 shows, in a schematic side view, a device for transporting and / or deflecting a material carpet 7 in a transport area 6 along a drum 4 (shown on a significantly enlarged scale) during the exemplary drying of the material carpet 7 in a housing 10 of a dryer 11. The material or the material carpet is fed onto the first belt 1 in an area not shown in detail or outside the housing 10 and conveyed along the running direction from the left out of the section towards the drum 4. One surface side of the material carpet 7 lies on the first belt 1 and the other surface side 8 is optionally freely accessible from above.

[0058] Not shown are the devices that support or carry out the drying process, such as hot air supply or hot air ducts, or convective or electromagnetic heating devices. Typically, the conveyor belts are permeable to air flow, and the drying air is directed from bottom to top through the housing or fed into and removed from the corresponding conveyor belts in tiers.

[0059] As the conveyor continues, the material carpet reaches the inlet area 12 in front of the drum 4 and at the beginning of the transport area 6. There are a variety of possible arrangements for the belts. In this example, in the inlet area 12, a second belt 2 is laid down or fed from above onto the free surface side 8 of the material carpet 7, which wraps tightly around the drum 4. A third belt 3 takes over the material carpet on the lower surface side from the first belt 1 at a suitable transition point, shown purely schematically. Finally, in the running direction 13, the material carpet 7 is clamped between the second belt 2 and the third belt 3 and, in this clamped manner, is guided upwards around the drum 4 through the transport area 6.In the outlet area 14, the material carpet 7 finally rests on the second belt 2 after a 180° rotation, while the third belt 3 is lifted from the surface side by a roller 5 that deflects and guides the belt. Not described in detail are further necessary rollers 5, which suitably guide and deflect the various belts 1, 2, 3 in the housing 10.

[0060] The device for deflecting and guiding the material carpet can also be arranged multiple times one above the other, thus creating multiple levels or drying stages for the material carpet. For reasons of clarity, optional guide walls in the inlet and outlet areas are not shown. These guide the longitudinal sides 9 of the material carpet 7 before and / or after the transport area 6 and, if necessary, ensure a smooth transition into and / or out of the transport area 6.

[0061] Figure 2 shows a schematic sectional view of the cross section of the transport area 6 or the material carpet 7 with the running direction of the belts 2, 3 perpendicular to the plane of the drawing and depicting a first embodiment of independent guide and sealing elements in the form of movable side walls 15, which can be arranged so as to run circumferentially. In a preferred embodiment, external grooves 22 or steps are located on the drum 4. The longitudinal sides 19 of the belt 2 are correspondingly exposed and can optionally be guided and / or sealed by a machine element 16 that undercuts the belt 2. Double arrows above the walls 15 represent a conceivable mobility or flexibility of the walls 15. 18 represents a possible spring force 18 for adjusting the walls to the longitudinal side 19 of the belt.

[0062] Figure 3 shows a further embodiment, similar to Figure 2, in which the side walls 15 are arranged between the belts 2 and 3 and can be variably adjusted or adjusted parallel to the axis of the drum 4. The walls 15, which function as guide and sealing elements, can act directly on the longitudinal side 9 of the material carpet 7 or, at a distance from it, provide a sealing effect.

[0063] Figure 4 shows a further embodiment with guide or sealing elements, implemented on the third belt 3 itself. For this purpose, belt 3 has an inner region 20 across its width, which can be designed with different stiffnesses compared to the belt longitudinal sides 19. If, for example, the region 20 is stiffer than the belt longitudinal sides 19, this leads to uniform compaction or guidance of the surface side 8 of the material carpet 7 and a curved sealing of the belt longitudinal sides 19 and the longitudinal sides 9. If, for example, the region 20 is more flexible and the belt longitudinal sides 19 are designed to be very stiff, the sealing effect is also ensured, but the influence of the third belt 3 on the surface side 8 of the material carpet is significantly more flexible.

[0064] According to Figure 5, a groove 23 which deepens the circumference is arranged on the drum 4. The material carpet can be guided in this groove 23, whereby the walls 15 of the groove 23 can assume the guiding and sealing effect for the material carpet 7. In this example, the third belt 3 is wider than the second belt 2. Alternatively, the second belt can be the same width as the third belt 3 and rest against the walls 15 and increase the sealing effect. Alternatively, the third belt 3 can also have the same width as the second belt 2 according to the drawing and also dip into the groove 23. Belts with different flexibility across the width, as in the embodiment in Figure 4, can also be used advantageously in conjunction with the groove 23.

[0065] Figure 6 shows an optional embodiment in which only a third belt 3 deflects the material carpet 7 together with the drum 4. A second belt 2 has been omitted here, but can still be implemented. The guide and sealing elements 1645 are implemented here with a disc 24 on the drum, which guides the optional belt 2 and belt 3 and seals them if necessary.

[0066] Figure 7 shows one possible arrangement of the guiding and sealing elements on belts 2 and 3. The left-hand partial section shows multi-track side walls 21 at the top of belt 3 with a single-track opposite side wall 17 on belt 2. Preferably, one side wall 17 engages between the two upper side walls 21 at the bottom as the belt passes through the transport area 6, thereby creating a sealing and guiding effect. On the right-hand side, elevations or side walls 21 and 17 are shown opposite one another. The minimum distance is shown for clarity and should, but is not mandatory, be closed to achieve a sealing effect. For larger materials, however, an opening may be desired to allow pressure equalization laterally when the carpet of material is squeezed by the third belt 3.

[0067] According to Figures 8 and 9, an interrupted side wall 21 is shown, preferably with multiple tracks according to Figure 9. With larger distances or due to a high material carpet 7, a side wall 21 on the belt 3 may not allow an increased radius of the side wall height compared to the radius of the belt 3 deflected at a roller 5 or may not be permanently elastic under difficult conditions (dryer). For this purpose, a double side wall 21 can be designed with two tracks, as shown, but each is spaced apart and / or interrupted. The differences in the side wall 21 are shown schematically (1645) in the transport area 6 (closed) on the drum 4 and on the upper roller 5 (open).

[0068] Reference symbol list 1645:

[0069] 1 volume

[0070] 2 volumes

[0071] 3 volumes

[0072] 4 drums

[0073] 5 roller

[0074] 6 Transport area

[0075] 7 Material carpet

[0076] 8 surface side (of 7)

[0077] 9 long side (of 7)

[0078] 10 housings

[0079] 11 dryers

[0080] 12 Inlet area

[0081] 13 Running direction

[0082] 14 Run-off area

[0083] 15 Wall

[0084] 16 machine element

[0085] 17 Side wall (on 2)

[0086] 18 spring force

[0087] 19 Long side of the band

[0088] 20 area

[0089] 21 Side wall (on 3)

[0090] 22 groove (outside at 4)

[0091] 23 groove (inside at 4)

[0092] 24 slices

Claims

Patent claims 1. Device for transporting and / or deflecting a material carpet, preferably during the drying of the material carpet (7) in a housing (10) of a dryer (11), with at least two endless belts (1, 2, 3) guided over rollers (5) for transporting the material carpet (7), wherein a transport area (6) for the material carpet (7) is arranged at least partially along a circumference of a drum (4), wherein the drum (4) and / or at least one of the belts is arranged in the transport area (6) for guiding and / or sealing the material carpet (7) on the two surface sides (8) of the material carpet (7), and wherein guiding and / or sealing elements are arranged at least in the transport area (6) on the two longitudinal sides (9) of the material carpet (7).

2. Device according to claim 1, characterized in that in the transport area (6) on the opposite surface sides (8) of the material carpet (7) a belt (2, 3) is arranged.

3. Device according to claim 1 or 2, characterized in that walls (15) are arranged as guide and / or sealing elements for or along the longitudinal sides (9) of the material carpet (7) and / or adjacent to the longitudinal sides (19) of the belts (2, 3) at an angle to the circumference of the drum (4).

4. Device according to claim 3, characterized in that the walls (15) are arranged as discs (24) or a groove (23) on the drum (4).

5. Device according to claim 4, characterized in that means or conveying elements, preferably rough or irregular surfaces for the material carpet (7), which increase the static friction are arranged on the circumferential walls (15) and / or on the surface sides of the belts (2, 3).

6. Device according to at least one of the preceding claims 2 to 5, characterized in that the walls (15) and / or the drum (4) are arranged to be axially displaceable along the axis of the drum (4), and preferably the walls (15) and / or the drum (4) are arranged to be prestressed relative to the belts (2, 3) or the material carpet (7) by actuators and / or a preferably predetermined spring force (18).

7. Device according to at least one of claims 2 to 6, characterized in that the walls (15) are guided in a groove (22) on the circumference of the drum (4) and / or a machine element (16) is arranged on the walls (15) which is aligned axially with respect to the drum (4) and undercuts a belt (2, 3).

8. Device according to at least one of the preceding claims, characterized in that at least one of the bands (2, 3) is designed to be flexible or stretchable at least partially across the width of the material carpet (7) for receiving and / or enveloping the material carpet (7).

9. Device at least according to claim 8, characterized in that at least the longitudinal side (19) of the band or an outer region along the longitudinal side (19) of the band (2, 3) is designed to be comparatively stiff compared to the flexible or stretchable region (20).

10. Device at least according to claim 8, characterized in that at least a predetermined region of the longitudinal side (19) of the band (2, 3) is flexible or stretchable and the remaining region (20) of the band (2, 3) is designed to be comparatively stiff across the width compared to the longitudinal side (19) of the band.

11. Device according to at least one of the preceding claims, characterized in that a cambered drum (4) and / or a circumferential groove (23) is arranged as a guide and / or sealing element on the drum (4) for at least partially receiving a belt (2) and / or the material carpet (7).

12. Device according to claim 1 or at least according to one of the preceding claims 2 to 11, characterized in that a side wall (17, 21) projecting at an angle from the surface side and / or a raised portion for guiding or sealing the longitudinal side (9) of the material carpet (7) is arranged as a guide and / or sealing element on a longitudinal side (19) of at least one of the belts (2, 3).

13. Device according to claim 12, characterized in that the side wall (17, 21) is designed along the running direction (13) in one or more tracks and / or in one or more pieces and / or interrupted in sections.

14. Device according to claim 12 or 13, characterized in that the side walls (17, 21) are arranged offset from one another, undercutting and / or touching one another over the width of the belts (1, 2, 3) and / or axially to the drum (4) at least in the transport area (6).

15. Device according to at least one of the preceding claims, characterized in that in the inlet area (12) and / or in the outlet area (14) a device for the longitudinal sides (9) is arranged which compresses the longitudinal sides (9) of the material carpet (7) or displaces them axially inwards to the drum (4).

16. Device according to at least one of the preceding claims, characterized in that guide walls for the longitudinal sides (9) of the material carpet and / or on the belts (1, 2, 3) are arranged in the inlet area (12) and / or in the outlet area (14), and these are preferably designed to be displaceable and / or alignable transversely to the running direction (13) of the material carpet (7).

17. Device according to at least one of the preceding claims, characterized in that the distance between the walls (15) and / or the guide walls in the inlet area (12), in the outlet area (14) and / or in the transport area (6) are different in and / or transversely to the running direction (13) and these preferably overlap in the running direction (13) at the adjacent areas.

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