Swivel screen belt device

Abstract

To provide a nonwoven fabric generating device that has at least two melt-blowing nozzle devices for generating melt-blown fibers and a screen belt device that enables a distance between an endlessly circulating screen belt and the melt-blowing nozzles to be easily changed.SOLUTION: A surface of at least one screen belt 6 facing a screen belt device 5 or melt-blowing nozzle devices 1, 2 is or can be oriented so as to be inclined with respect to a horizontal direction H in lateral view for changing a distance A1 and / or A2 between the screen belt 6 and the melt-blowing nozzles.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an apparatus for producing nonwoven fabrics, comprising at least two melt-blowing nozzle devices, in particular at least two melt-blowing nozzle beams, for the production of melt-blown fibers, In this case, a screen belt device or a screen belt table is provided having at least one screen belt which circulates endlessly, At this time, the meltblown fibers of the meltblown nozzle device can be deposited on at least one of the screen belts of the screen belt device; In this regard, the meltblowing nozzle device defines, in a side view, a vertical distance A1 or A2 between the respective nozzle tip and the surface of the at least one screen belt. [Background technology]

[0002] Nonwoven fabric production apparatuses of this type are basically known from practice. The important process parameters are then the distances A1 and A2, which are often different from one another and therefore need to be adjusted individually depending on the nonwoven fabric to be produced. In the known nonwoven fabric producing apparatus, the adjustment of the distance A1 or A2, respectively, is thereby effected by changing the height of the melt-blowing nozzle arrangement.

[0003] This is due to the fact that the screen belts for both melt-blowing nozzle devices form a common reference plane, so that a change in the height of the screen belt changes the spacing A1 or A2 equally, and individual adjustment of the spacings A1 and A2 is not possible by changing the height of the screen belt. Summary of the Invention [Problem to be solved by the invention]

[0004] However, changing the height of the melt-blowing nozzle device is very time-consuming. As a result, the object of the present invention is to reduce the time-consuming change of the distance A1 or A2. [Means for solving the problem]

[0005] The challenges mentioned at the beginning are A nonwoven fabric producing apparatus comprising at least two melt-blowing nozzle devices, in particular at least two melt-blowing nozzle beams, for producing melt-blown fibers, In this case, a screen belt device or a screen belt table is provided having at least one screen belt which circulates endlessly, At this time, the meltblown fibers of the meltblown nozzle device can be deposited on at least one of the screen belts of the screen belt device; In the above nonwoven fabric generating apparatus, the melt-blowing nozzle device defines a vertical distance A1 or A2 between each nozzle tip and at least one surface of the screen belt in a side view, The problem is solved by a nonwoven fabric generating apparatus characterized in that the screen belt device or at least one surface of the screen belt directed toward the melt-blowing nozzle device is aligned or can be aligned at an incline with respect to the horizontal direction H in a side view due to the change in the distances A1 and / or A2. Effect of the Invention

[0006] The basis of the present invention is, first of all, the recognition that nonwoven fabric producing devices will become even more flexible in the future. This increased demand for flexibility makes the change of the spacing A1 or A2 in the conventional constructions and manners by changing the height of the melt-blowing nozzle device seem less and less attractive. The invention is based on the realization that the tilt position of at least one screen belt provides an additional degree of freedom in adjusting the screen belt, thus allowing the individual change of the distance A1 or A2. Accordingly, the invention pursues a fundamentally new approach, which does not require the traditional, very laborious, change of the height of the melt-blowing nozzle device. As a result, the problem described at the beginning is solved. According to a very particularly advantageous embodiment, the screen belt device or the screen belt table is pivotable about at least one pivot axis, in particular only one pivot axis, for tilt alignment or for changing the distances A1 and / or A2. The term "swivelable" refers in particular to special devices or swivel devices provided for pivoting in the screen belt arrangement.

[0007] It is particularly advantageous if the screen belt arrangement has a pivoting device, which can in particular have one or more rollers or a pivot axis or a pivot shaft. The swivel device preferably comprises at least one actuator, more preferably at least two and particularly preferably at least four actuators, which may be, for example, pneumatic or hydraulic or electromechanical cylinders. Furthermore, certainly as well as completely different drives are also conceivable, within the scope of which, for example, an electric motor with a spindle drive is included. It is particularly advantageous if at least one actuator is provided on each side of the pivot axis. It is expedient if, in a view from above and in the machine direction, at least one actuator, and preferably two actuators in each case, are arranged in the screen belt device on both sides of the screen belt. It is particularly advantageous if two pairs of actuators are provided on each side of the pivot axis, with each pair of actuators preferably having one actuator on the left side of the screen belt and one actuator on the right side of the screen belt. It is possible for the pivoting device to have springs, for example coil springs, for supporting the actuators from below.

[0008] It is particularly advantageous that, due to the change in the distances A1 and / or A2, a lifting and / or a pivoting movement of the screen belt device can be performed.It is particularly advantageous that, due to the change in the distances A1 and A2, which are different in intensity and abrupt, a pivoting movement as well as a lifting and / or a pivoting movement of the screen belt device can be performed. In the presence of the possibility of carrying out lifting movements as well as swiveling movements, two simultaneous degrees of freedom exist, in which any suitable combination of the distances A1 and A2 is possible - especially within a given span in the possible changes of the height position.

[0009] It is particularly advantageous if the pivot axis is arranged perpendicular or essentially perpendicular in a top view to the machine direction (MD) or to the longitudinal extension of the screen belt device or at least one screen belt. It is expedient if the screen belt device has two side walls, which are expediently arranged on the left or right side of the screen belt device with respect to the machine direction. Advantageously, the screen belt device comprises at least two, more advantageously at least four or six or eight, screen belt rollers. Advantageously, the side walls carry these screen belt rollers. Advantageously, these screen belt rollers guide or drive at least one of the screen belts. The screen belt can have one joint for forming a circulation or can be woven in a completely even circulation. It is advantageous for the screen belt device to have a provision, by means of which the screen belt formed to be circulated can be accommodated. For this purpose, it is possible that a movable screen belt roller or a movable part of the side wall is provided.

[0010] It is particularly advantageous if at least two melt-blowing nozzle devices are provided with an associated suction area in each case, which are expediently located below the respective melt-blowing nozzle device. Advantageously, the screen belt device comprises for each meltblowing nozzle device at least one air passage for the intake of air in the respective deposition or suction area above the at least one screen belt. It is advantageous if at least two air channels are arranged between the upper part and the lower counter-running part of at least one screen belt. It is possible for the at least two air channels to be connected to a common air conveying unit or to different air conveying units. The air channels are designed in such a way that they draw air from above to below the screen belt or through the screen belts.

[0011] It is advantageous if the pivot axis is arranged in the middle third or quarter or fifth or sixth with respect to the longitudinal extension of the screen belt device, advantageously in the center or essentially in the center of the screen belt device. It is advantageous if the screen belt device is configured in a seesaw-like manner with respect to the pivot axis. It is basically possible for the pivot axis to be arranged in the right or left third in a side view of the screen belt device or at the left or right end of the screen belt device.

[0012] According to an advantageous embodiment, the attitude angle α between the surface of at least one screen belt directed towards the meltblowing nozzle device and the horizontal direction H is between -10° and 10°, in particular between -8° and 8°, and advantageously between -7° and 7°, and particularly advantageously between -6° and 6°. The invention is based on the recognition that the nonwoven fabric is not adversely affected at correspondingly small attitude angles.

[0013] It is advantageous for the vertical height difference Δh between the deposition area of ​​the surface of at least one screen belt for the meltblown fibers in the inclined orientation of the screen belt device and this deposition area in the horizontal orientation of the screen belt device to be from 100 to 500 mm, preferably from 120 to 400 mm, and particularly preferably from 140 to 350 mm. It has been found that a corresponding vertical height difference Δh is sufficient to vary the spacings A1 and / or A2 sufficiently, at least for the majority of heights occurring in practice.

[0014] According to one embodiment, the screen belt device has only one screen belt that circulates endlessly, and advantageously, the meltblown fibers from at least two meltblown nozzle devices are deposited into at least two layers of one meltblown fiber. Due to the deposition of the relatively hot fibers of the second melt-blowing nozzle device onto the fibers of the first melt-blowing nozzle device, a light bonding is already performed, which therefore does not necessarily require a subsequent solidification device for better fixing of both layers in contact with each other.

[0015] According to a highly advantageous embodiment, the screen belt device has at least two, possibly only two, endlessly circulating screen belts. It is possible for a transfer area to be located between both of these screen belts. It is advantageous if the surfaces of the two screen belts facing the melt-blowing nozzle device are located in line. It is advantageous if the two mutually assigned ends of the screen belt in the transfer area have a height difference of not more than 100 mm, or 70 mm, or 50 mm, or 30 mm, or 20 mm.

[0016] It is possible for at least two or even just two endlessly circulating screen belts to circulate in the same or opposite directions. It may be advantageous in some cases when the screen belts are operated at different speeds.

[0017] According to one embodiment, the nonwoven fabric generating device or screen belt device is configured such that at least one, in particular only one, meltblown nonwoven web is guided under the screen belt device over at least a portion of the transport path of the meltblown nonwoven web. It is possible that at least one of the meltblown nonwoven webs is guided downwards in the transfer area and then guided via screen belt rollers under the second screen belt or under the counter-running part of the second screen belt. It is basically possible that the nonwoven webs of two or more meltblown nozzle devices are guided downwards in the transfer area and then conveyed away via screen belt rollers under the first and / or second screen belt.

[0018] It is possible that at least two, in particular only two, meltblown nonwoven webs are discharged only on the upper side of the screen belt device, respectively. According to one embodiment, the at least two meltblown nonwoven webs are discharged in different directions and are advantageously wound up separately. It is possible that the fibers of the first melt-blown nozzle device first form a fiber web on the first screen belt, and then subsequently transfer it across the transfer area onto the second screen belt, on which the fibers of the second melt-blown nozzle device then form a second layer on the first nonwoven web or the first layer.

[0019] According to an advantageous embodiment, the nonwoven fabric generating apparatus is configured in such a way that the first and second meltblowing nozzle devices generate first and second nonwoven fabric webs, which are only gathered together after exiting the screen belt device.

[0020] It is within the scope of the invention to provide downstream of the screen belt device a consolidation device, in particular a combined device for consolidation or lamination of two or more layers. The consolidation device may in particular bring about chemical and / or mechanical and / or thermal consolidation of a nonwoven web or of several layers of a nonwoven web. By way of example, calendaring or needling with a liquid are mentioned.

[0021] The present invention relates to an apparatus for producing a nonwoven fabric having at least two spinning devices for the production of two fiber types. Apparatuses of this type are known from practice in order to make it possible to combine the properties of two fiber types with one another in one nonwoven fabric. For this purpose, the fibers of a first spinning unit are deposited on a screen belt unit with an endlessly rotating screen belt, and the fibers of a second spinning unit are deposited on top of the fibers of the first spinning unit, thus producing a nonwoven fabric with two layers and combining the properties of two different fiber types with each other in a nonwoven fabric.

[0022] However, the direct deposition of the fibers of the second spinning unit onto the fibers of the first spinning unit always leads to undesirable thermal lamination, since the fibers of the second spinning unit still have a corresponding heat during deposition. It may, for example, be desirable for both layers to be bonded to one another only by mechanical consolidation, for example by needling. Furthermore, it is possible that, for example, fibers from three spinning units are to be assembled into one nonwoven fabric, where the middle spinning unit of these spinning units should not produce the middle fiber layer of the three fiber layers produced, but rather one of the two outer fiber layers. The problem underlying the present invention is accordingly to eliminate the above-mentioned disadvantages.

[0023] This problem is solved by an apparatus for producing a nonwoven fabric, which comprises at least two spinning units for producing fibers, in particular at least two meltblowing nozzle units or at least two spunbond nozzle units or at least one meltblowing nozzle unit or at least one spunbond nozzle unit, in particular having one of the features of the apparatus for producing a nonwoven fabric according to the invention as described above, In this case, a screen belt device or a screen belt table is provided which has at least one of the features of the screen belt device according to the invention described above, In this case, the fibers of the spinning device can be deposited on the screen belt device, In this case, the screen belt device has at least two screen belts which circulate endlessly.

[0024] The invention is based on the realization that two endlessly rotating screen belts provide multiple possibilities for the treatment of the nonwoven web to be produced. For example, the first fibers of the first spinning device can be guided downwards in the transfer area between the screen belts and guided under the second screen belt, so that only after the exit of the screen belt device are both nonwoven webs gathered together. This can avoid high-temperature deposition of the second fibers on the first nonwoven web. In addition, the nonwoven webs of the spinning device can be discharged in different directions, thus allowing one nonwoven web to be turned over and the nonwoven layers to be assembled in another order. As a result, the above-mentioned problem is solved.

[0025] The invention will now be explained in more detail with the aid of several exemplary embodiments. [Brief description of the drawings]

[0026] [Figure 1] 1 is a side view of a first embodiment of a nonwoven fabric generating apparatus according to the present invention having a first screen belt device according to the present invention; FIG. [Diagram 2] FIG. 2 is a perspective view of a second screen belt apparatus according to the present invention. [Diagram 3] FIG. 2 is a schematic side elevational view of a second nonwoven fabric producing apparatus according to the present invention in a first operating method. [Figure 4] 4 is a diagram of the nonwoven producing apparatus of FIG. 3 in a second operating method. [Diagram 5] 4 is a diagram of the nonwoven producing apparatus of FIG. 3 in a third operating method. [Figure 6] FIG. 4 is a diagram of the nonwoven fabric producing apparatus of FIG. 3 in a fourth operating method. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] In FIG. 1, an apparatus for producing a nonwoven fabric according to the invention is illustrated which has two spinning devices, in particular two melt-blowing nozzle devices 1, 2 or two melt-blowing nozzle beams. Below the melt-blowing nozzle devices 1, 2 there is a screen belt device 5 which has only one endlessly circulating screen belt 6. The endlessly circulating screen belt 6 is guided in this embodiment via eight screen belt rollers 20. The screen belt 6 has upper parts which are directed towards the melt-blowing nozzle devices 1, 2 and extend in the transport direction. Below the screen belt device 5, a part of the screen belt 6 runs against this transport direction.

[0028] Between the upper and lower parts of the screen belt 6, a first air channel 18 and a second air channel 19 are located, the first air channel 18 being associated with the first melt-blowing nozzle arrangement and the second air channel 19 being associated with the second melt-blowing nozzle arrangement 2. It is possible for the air channels 18, 19 to be connected to one another via an air conveying unit or to be separated from one another via two different air conveying units. In these air channels 18, 19, air is transported downwards, so that air is sucked in from above the screen belt 6 and guided through perforations in the screen belt 6 into these air channels 18, 19. The air channels 18, 19 are expediently located directly below the respective deposition area or directly below the respective melt-blowing nozzle device 1, 2.

[0029] The first fibers 3 of the first meltblowing nozzle device 1 first of all form a proper first nonwoven web 15. As soon as this first nonwoven web 15 reaches the deposition area of ​​the second fibers 4, these second fibers 4 form a second layer 13 on this first nonwoven web 15 (=first layer 12). As soon as the second layer 13 is deposited on the first layer 12, we are talking about a nonwoven 14. After exiting the screen belt device 5, the nonwoven fabric 14 is further guided through a nonwoven fabric web roller 21 and then fed to a solidification device 17. The solidification device 17 in this embodiment can be a calender, whose rolls apply pressure and release heat, so that the nonwoven fabric 14 is a laminated nonwoven fabric after exiting the solidification device 17. Due to the direct deposition of the second fibers 4 on the first fibers 3, in this embodiment a high-temperature deposition is achieved, so that the first lamination is already carried out during this high-temperature deposition, so that a consolidation device 17, in particular a thermal consolidation device 17, is not required for all nonwoven products of this embodiment.

[0030] It can be seen in FIG. 1 that each meltblowing nozzle arrangement of the two meltblowing nozzle arrangements 1, 2 has a nozzle tip 8, 9 associated with it. The nozzle tip 8 defines a vertical distance A1 between itself and the surface of the screen belt 6. Similarly, the nozzle tip 9 defines a vertical distance A2 between itself and the surface of the screen belt 6. These distances A1 and A2 need to be adjustable individually and independently of each other.

[0031] For this reason, the screen belt device 5 according to Fig. 2 has a pivot axis 10 and in particular an actuator 27, by means of which the entire screen belt device 5 can be pivoted through an attitude angle α. By individual control of the actuators 27, not only this attitude angle α but also the vertical lifting stroke Δz can be adjusted. Both of these degrees of freedom, α and Δz, allow, within certain limits, suitable variations of the spacings A1 and A2, respectively.

[0032] The actuators 27 may be, for example, electromechanical or hydraulic cylinders. The actuators 27 are advantageously fixed with their respective upper ends to the side walls 24 of the screen belt device 5. The lower ends of the actuators 27 are advantageously arranged on the sliders 23, which may be supported on the rails 22. A slider 23 on the rail 22 allows quick maintenance of the meltblowing nozzle apparatus 1, 2 from below.

[0033] The pivot axis 10 in this exemplary embodiment can also be formed by rollers which connect the pivot guide 25 with the associated side wall 24. The opposite side of the device 5 which is not shown is expediently formed identically or symmetrically to the side shown in FIG. Both rollers of the pivot axis 10 support the screen belt arrangement 5 in such a way that movements in the machine direction as well as transverse to this machine direction in a view from above are prevented.

[0034] As can be seen at the pivot axis 10', which is indicated in the groove 26 of the pivot axis guide 25 and is arranged somewhat lower, both pivot axis guides 25 therefore only allow movement in the height direction. Moreover, the pivot guide 25 still allows a rotational movement, as this movement is expressed in the attitude angle α. It is self-evident that the actuators 27, not shown, are moved synchronously with respect to their respective shown counterparts. Both right actuators 27 are controllable independently of both left actuators 27. This independent controllability allows both degrees of freedom α and Δz.

[0035] In the embodiment according to Fig. 2, the screen belt device 5 comprises two endlessly circulating screen belts 6, 7. The screen belts 6, 7 are guided by four screen belt rollers 20, respectively, and form a transfer area 11 between the screen belts 6 and 7. It should be pointed out that both screen belts 6, 7 can be replaced by a single screen belt 6, thus resulting in a configuration according to FIG.

[0036] In Fig. 3, the screen belt device 5 of Fig. 2 is shown in a simplified manner and is used in a first operating method, as a result of which both screen belts 6, 7 are moved in opposite directions, so that a first nonwoven web 15 of first fibers 3 of the first melt-blowing nozzle device 1 is delivered to the right and a second nonwoven web 16 of second fibers 4 of the second melt-blowing nozzle device 2 is delivered to the left. It is not shown that both nonwoven webs 15, 16 are wound around each other separately. It is therefore possible, by the operating method shown in FIG. 3, to produce two nonwoven webs 14 which are completely independent of each other.

[0037] In figure 4 a second method of operation of the screen belt device 5 of figure 2 is shown, as a result of which the screen belts 6, 7 are operated in the counterclockwise direction. The first nonwoven web 15 of the first fibers 3 is redirected downwards in the transfer area. It is then received by a nonwoven web roller 21 and rubbed alongside the second screen belt 7 on the underside thereof. The nonwoven web roller 21 brings together both nonwoven webs 15, 16, thus producing a nonwoven fabric 14 with a first layer 12 and a second layer 13. The nonwoven fabric 14 is finally consolidated by a consolidation device 17. Through this configuration, a hot deposition of the second fibers 4 on the first fibers 3 or on the first nonwoven web 15 is avoided. Through a separate guidance of the first nonwoven web 15, it is additionally possible to feed this first nonwoven web 15, before the gathering of the nonwoven webs 15, 16, into a separate, not shown, processing device.

[0038] In Fig. 5, in contrast to Fig. 4, the direction of the first screen belt 6 is now aligned clockwise, whereby the first nonwoven web 15 is turned over relative to the second nonwoven web 16, which is particularly significant if the first nonwoven web 15 is already formed in a multi-layer by itself. In the case of Fig. 6 it is shown that it is in fact possible for the screen belts 6, 7 to assume an opposite direction of movement in comparison with Fig. 5 and thus in particular also possible to turn over the second nonwoven web 16. In this way Figs. 3 to 6 show the great flexibility that is given in the case of the use of two screen belts 6, 7. In addition, the present application relates to the invention described in the claims, but may also include the following as other aspects. 1. A nonwoven fabric producing apparatus comprising at least two melt-blowing nozzle devices (1, 2) - in particular at least two melt-blowing nozzle beams - for producing melt-blown fibers (3, 4), A screen belt device (5) or a screen belt table is provided having at least one endlessly circulating screen belt (6, 7), The meltblown fibers (3, 4) of the meltblown nozzle device (1, 2) can be deposited on at least one of the screen belts (6, 7) of the screen belt device (5); In the above nonwoven fabric producing apparatus, the melt-blowing nozzle devices (1, 2) define a vertical distance A1 or A2 between each nozzle tip (8, 9) and the surface of at least one of the screen belts (6, 7) in a side view, The nonwoven fabric generating apparatus is characterized in that the surface of the screen belt device (5) or at least one of the screen belts (6, 7) directed toward the melt-blowing nozzle devices (1, 2) is aligned or can be aligned at an incline with respect to the horizontal direction H in a side view due to the change in the intervals A1 and / or A2. 2. The nonwoven fabric generating apparatus described in claim 1, characterized in that the screen belt device (5) or the screen belt table is rotatable about at least one pivot axis (10), in particular about one pivot axis (10), for the inclination alignment or for the change of the spacing A1 and / or A2. 3. The nonwoven fabric generating apparatus according to claim 1 or 2, characterized in that the screen belt device (5) can be raised and lowered and / or rotated in order to change the intervals A1 and / or A2. 4. The nonwoven fabric generating apparatus according to claim 2 or 3, characterized in that the pivot axis (10) is arranged perpendicular or essentially perpendicular to the machine direction (MD) or to the longitudinal extension of the screen belt device when viewed from above. 5. The nonwoven fabric generating apparatus according to any one of claims 2 to 4, characterized in that the pivot axis (10) is located within the middle third of the screen belt device (5) with respect to the longitudinal extension thereof, advantageously in the center or essentially in the center of the screen belt device (5). 6. The attitude angle α between the surface of at least one of the screen belts (6, 7) directed towards the melt-blowing nozzle device (1, 2) and the horizontal direction H is: 6. An apparatus for producing nonwoven fabrics according to any one of claims 1 to 5, characterized in that the angle is between -10° and 10°, in particular between -8° and 8°, and advantageously between -7° and 7°. 7. The difference Δh in vertical height between the deposition area of ​​the surface of at least one of the screen belts (6, 7) for the meltblown fibers (3, 4) in the inclined orientation of the screen belt device (5) and this deposition area in the horizontal orientation of the screen belt device is 7. An apparatus for producing nonwoven fabrics according to any one of claims 1 to 6, characterized in that the thickness is between 100 and 500 mm, and preferably between 120 and 400 mm. 8. An apparatus for producing nonwoven fabric according to any one of claims 1 to 7, characterized in that the screen belt device (5) has at least two, in particular two, screen belts (6, 7) which circulate endlessly. 9. An apparatus for producing nonwoven fabric according to claim 8, characterized in that the at least two, in particular two, endlessly circulating screen belts (6, 7) circulate in the same direction or in opposite directions. 10. An apparatus for producing a nonwoven fabric according to claim 8 or 9, characterized in that at least one, in particular one, meltblown nonwoven web (15, 16) is guided under the screen belt device (5) over at least a part of the transport path of the meltblown nonwoven web. [Explanation of symbols]

[0039] 1. First melt blow nozzle device 2 Second melt blowing nozzle device 3. The first fiber: meltblown fiber 4. Secondary Fiber, Meltblown Fiber 5 Screen belt device 6. First Screen Belt 7 Second Screen Belt 8 Nozzle tip 9 Nozzle tip 10 Pivot axis 10´ Pivot axis 11 Delivery Area 12 First Layer 13 Second Layer 14 Nonwoven fabrics 15 First nonwoven web, meltblown nonwoven web 16 Second nonwoven web, meltblown nonwoven web 17 Solidification equipment 18 First air passage 19 Second air passage 20 Screen belt roller 21 Nonwoven web roller 22 Rail 23 Slider 24 Side wall 25 Swivel axis guide 26 Groove 27 Actuator A1 Vertical Spacing A2 spacing Δz Lifting stroke

Claims

1. A nonwoven fabric producing apparatus comprising at least two melt-blowing nozzle devices (1, 2) - in particular at least two melt-blowing nozzle beams - for producing melt-blown fibers (3, 4), A screen belt device (5) or a screen belt table is provided having at least one endlessly circulating screen belt (6, 7), The meltblown fibers (3, 4) of the meltblown nozzle device (1, 2) can be deposited on at least one of the screen belts (6, 7) of the screen belt device (5); In the above nonwoven fabric producing apparatus, the melt-blowing nozzle devices (1, 2) define, in a side view, a vertical distance A1 or A2 between each nozzle tip (8, 9) and the surface of at least one of the screen belts (6, 7), The screen belt device (5) or the surface of at least one of the screen belts (6, 7) directed toward the melt-blowing nozzle devices (1, 2) is aligned or can be aligned at an incline with respect to the horizontal direction H in a side view due to the change in the spacing A1 and / or A2.

2. 2. The nonwoven fabric generating apparatus according to claim 1, characterized in that the screen belt device (5) or the screen belt table is rotatable about at least one pivot axis (10), in particular about one pivot axis (10), for the inclination alignment or for the change of the distances A1 and / or A2.

3. 3. Apparatus for producing nonwoven fabric according to claim 1 or 2, characterized in that, for said change of said distances A1 and / or A2, a lifting and / or a swiveling movement of said screen belt device (5) is possible.

4. 3. The nonwoven fabric generating apparatus according to claim 2, characterized in that the pivot axis (10) is arranged perpendicular or essentially perpendicular to the machine direction (MD) or to the longitudinal extension of the screen belt device, when viewed from above.

5. 5. The nonwoven fabric generating apparatus according to claim 4, characterized in that the pivot axis (10) is arranged within the middle third of the length of the screen belt device (5) with respect to the longitudinal extension of the screen belt device (5), preferably in the center or essentially in the center of the screen belt device (5).

6. The orientation angle α between the surface of at least one of the screen belts (6, 7) directed towards the melt-blowing nozzle device (1, 2) and the horizontal direction H is:

6. Apparatus for producing nonwoven fabrics according to claim 1, characterized in that the angle is between -10° and 10°, in particular between -8° and 8°, and advantageously between -7° and 7°.

7. The difference in vertical height Δh between the deposition area of ​​the surface of at least one of the screen belts (6, 7) for the meltblown fibers (3, 4) in the inclined orientation of the screen belt device (5) and this deposition area in the horizontal orientation of the screen belt device is 7. Apparatus for producing nonwoven fabrics according to claim 1, characterized in that the thickness is between 100 and 500 mm, and preferably between 120 and 400 mm.

8. 8. Apparatus for producing nonwoven fabric according to any one of claims 1 to 7, characterized in that the screen belt device (5) has at least two, in particular two, screen belts (6, 7) which circulate endlessly.

9. 9. Apparatus for producing nonwoven fabric according to claim 8, characterized in that the at least two, in particular two, endlessly circulating screen belts (6, 7) circulate in the same or in opposite directions.

10. 10. Apparatus for producing nonwoven fabric according to claim 8 or 9, characterized in that at least one, in particular one meltblown nonwoven web (15, 16) is guided under the screen belt device (5) over at least a part of the transport path of the meltblown nonwoven web.

Images