CN117999155A - Wind-spreading chamber and method for spreading and shaping a free-flowing material on a shaping belt - Google Patents

Abstract

The invention relates to a wind-spreading chamber and a method for spreading a free-flowing material on an endless forming belt (12) and forming it into one or more layers of material webs (11), preferably during the production of material sheets in a press, wherein openings (16) for feeding material (8), inlets (14) and outlets (15) for an air flow (13) and a fan (10) for generating the air flow (13) are arranged on the wind-spreading chamber (21). The object of the invention is to meet the demands made by the industry for high quality and minimum raw materials with a short and compact structural length by providing a device as an inlet (14) for an air flow (13) or at the inlet (14) a slot nozzle (1) is arranged which is variable in terms of size, direction and/or position in the wind distribution chamber (21).

Description

Wind-spreading chamber and method for spreading and shaping a free-flowing material on a shaping belt

The present invention relates to a wind-spreading chamber according to the preamble of claims 1 and 22 for spreading and shaping a free-flowing material on an endless loop of shaping belt.

Furthermore, the invention relates to a method according to the preamble of claim 23 for spreading and shaping a free-flowing material on an endless loop of shaping belt, preferably during the production of material sheets in a press.

In the production of material boards, natural materials such as annual plants, woody shrubs, trees or the like are chopped, dried, if necessary mixed with binders, spread into a material web (mat), and compacted in a press into material boards. It is also envisaged to use plastic or other material to obtain a dispensable (sortable/divisible) flat strip of material in a continuous production process. It is also conceivable to carry out a cyclic processing of the material web (mat), for example dispensing the material web (mat) before pressing. It is particularly preferred that nowadays in the production of fibreboard and chipboard natural materials are increasingly replaced by recycled materials to minimize the material requirements for virgin wood. It is common to combine wind-spreading chambers with other spreading means to achieve various layered structures.

For example, DE 198,35,319 a1 discloses a device and a method for wind screening. From the above disclosure, it is known to use various techniques to influence the air flow, in particular the air screen device and the suction device. Wind forming techniques emphasize a uniform but classified placement of material. Vortex flow in the gas flow and separation of the gas flow on the wall should be avoided, as these affect the accuracy of the weight per unit area.

In the prior art, fans or blowers for air flows are typically radial fans with rectangular discharge openings. The radial fan is arranged with its axis parallel to the width of the wind-spreading chamber and is embodied so as to be significantly narrower than the width of the wind-spreading chamber. Thus, the air flow exiting the relatively small exhaust openings must be "pulled up" or spread out in width and height until it enters the wind-spreading chamber.

A diffuser is arranged between the fan and the wind-spreading chamber, wherein one or more baffles are used. These baffles serve to amplify or disperse the air flow by counter pressure and to direct the air flow into the wind-spreading chamber through the openings or regulators of the baffles parallel to the forming belt.

In DE 10 1007 056 109 A1, a special improvement proposal is known for the above-mentioned prior art, which proposes to try to shorten the diffuser length by: the air flow is first directed to bypass the fan after leaving the fan and expand in width, and then expand in height over a relatively short distance. This can be used to reduce the installation space for the supply of the wind distribution chamber.

A wind distribution chamber is also known from DE 10 2020 103 233 A1, which introduces a large area of air flow into the wind distribution chamber in height and width. Here, the air flow also has a baffle before entering the wind-spreading chamber for controlled formation of the air flow through a plurality of different openings in height and width.

The current wind-spreading head consists of a (one) chamber into which air is blown through an adjustable regulator. The chamber itself is typically a rectangular body into which the screen is typically inserted in the forward region to break up the material flow and reject the oversized material. In addition, the wind-spreading head may be equipped with a roller screen to improve surface quality and spreading accuracy.

DE 10 2015 112 013 A1 discloses a wind-spreading chamber over which one or more fans (radial fans) are arranged and which are pulled from a circular shape through an arc section into angular shapes and are pulled in width. At the end of the arc, a complex resistance element is provided at the transition region of the wind-spreading chamber, where there are a large number of nozzles. The nozzle is circular at the outlet, forming an array of nozzle openings in cross-section and transverse to the cross-section, which can be adjusted differently. Here, a baffle or diffuser plate may also be provided to make the air flow more evenly distributed across the width and height after it expands. Because of the regulator and nozzle arrangement, a higher energy input is required.

The industry today requires both high accuracy in weight per unit area and an increasing reduction in the required natural raw materials, as well as partial or complete replacement of the raw materials with recycled materials. This is also sometimes a national mission in various countries all of which often results in the use of longer wind-spreading rooms. The energy required to operate the device, in particular the fan, is also considered a raw material, which must work against the flow barrier, thus unnecessarily consuming energy.

The object of the present invention is to provide a wind-spreading chamber and a method for spreading a free-flowing material on an endless forming belt and forming it into one or more webs of material (mats), which allow the requirements imposed by the industry for high quality and minimum raw materials to be met with a short and compact structural length.

The invention starts from a wind-spreading chamber for spreading and shaping a free-flowing material, in which chamber one or more layers of material webs (mats) are formed on an endless forming belt, preferably during the production of material sheets in a press, wherein openings for feeding material, inlets and outlets for air flows and fans for generating air flows are provided at the wind-spreading chamber.

The task of the wind-spreading chamber is on the one hand solved by providing the air flow at the inlet with at least one inlet and/or slot nozzle, which is variable in the size, direction and/or position of the air flow in the wind-spreading chamber.

In another independent design of the wind-spreading chamber, this problem is solved by arranging a cross-flow fan to generate the air flow.

With respect to such a method for dispersing and shaping a free-flowing material in a wind-dispersing chamber on an endless circulating shaping belt, preferably during the production of a material sheet in a press, the invention results therefrom that the material is introduced into the wind-dispersing chamber through an opening and is placed separately on the shaping belt by means of an air flow through the wind-dispersing chamber, wherein the air flow is generated by a fan and enters through an inlet and exits from the wind-dispersing chamber through an outlet.

The invention solves the following problems: the air flow is introduced into the air dispersion chamber through slot nozzles for applying material, wherein the slot nozzles and/or the inlet are adjustable with respect to their size, direction, position and/or distance from the forming belt.

The invention has the following advantages:

Better isolation is obtained by the described technical changes compared to the state of the art, whereby a finer surface can be obtained, the amount of abrasive added is reduced, and thus the raw material costs are saved. Furthermore, by means of an optimized flow guiding device, less material is expected to enter the optional suction device at the end of the wind-spreading chamber. Furthermore, the required air quantity can be reduced by optimizing the supply air, and the production cost (energy source) of the air quantity can be reduced by lower pressure loss. In addition to these advantages in the production being performed, manufacturing costs may be reduced by eliminating complex components of the regulator or diffuser.

The present invention overcomes the prejudice known to the person skilled in the art by using slot nozzles. It is acknowledged that the height or width of the wind dispersion chamber must be substantially covered when the air stream is fed.

In addition or as a separate invention, the invention also overcomes the prejudice that only radial fans are suitable for providing a sufficiently high pressure for the air flow of the wind-distribution chamber due to the structural form of the radial fans.

It has been shown, in particular, surprisingly that slit-like nozzle arrangements for introducing a relatively strong gas flow provide advantages in terms of separation (segregation) compared to introducing a gas flow over a large area.

Further features of the dependent claims are set out below, which may be used to further refine the invention independently or in any combination.

It is particularly preferred that the width of the slot nozzle corresponds substantially to the width of the wind-spreading chamber. When the slot nozzle is disposed within the wind-spreading chamber, the side walls of the wind-spreading chamber may form lateral boundaries of the slot nozzle. For alternative designs where the inlet and slot nozzle coincide, the slot nozzle will be located outside the wind dispersion chamber and must have separate side plates.

In this case, the distance between the inlet and the molding belt can be adjusted. Alternatively or additionally, for a slot nozzle starting at the inlet of the wind-spreading chamber, in other words the inlet of the wind-spreading chamber coincides with the inlet side of the slot nozzle, it can be provided that the inlet and the outlet of the slot nozzle have a distance from the forming belt and/or that their height can be variably adjusted.

Alternatively or additionally, at least one movable nozzle plate may be provided for adjusting the height of the slot nozzle and/or the inlet, and/or the height of the slot nozzle and/or the inlet may be adjustable between 10mm and 400mm, preferably between 80mm and 180 mm.

Alternatively or additionally, it may be provided that a substantially rectangular connection, a regulator and/or a permeable (passable) baffle or perforated plate is provided between the fan and the slot nozzle for influencing or homogenizing the air flow.

Alternatively or additionally, it may be provided that the adjustment of the plate, viewed from the central axis of the cross section of the connection piece or slot nozzle, may take place uniformly at an angle or unevenly.

Alternatively or additionally, in order to influence the air flow between the fan and the slot nozzle and/or the cross section of the connection for the air flow, a movable element, preferably a plurality of elements which can be moved (pushed) into the cross section and moved (pushed) out of the cross section in width, preferably an adjustable or adjustable element, is provided. The setup is preferably performed after the wind dispersion chamber is installed and several test runs are performed, with few modifications. However, the process can also be automated and incorporated into a control or control operation. The flow barriers introduced partly in width over the cross-section of the connection can influence the spreading distribution of the material, so that different adjustment options or flow stops are provided for different production types (if possible), preferably partly along the width or height of the cross-section.

In addition to the features of the invention, a dispersing roller and/or a guide plate can be provided between the opening and the slot nozzle, wherein preferably at least two guide plates are provided for multiple deflections of the material. Depending on the type of material, it may be advantageous in some cases to feed the material into the wind-spreading chamber in the form of a material blanket or curtain and to disintegrate (disperse/spread) and transport it by the air flow from the slot nozzle. In this case, multiple deflections can lead to loosening of the material, which has a positive effect on the dispersion (scattering).

Alternatively or additionally, the nozzle plate may be segmented over the width of the slot nozzle, in particular in order to improve the adjustability. This would (if possible) reduce the need for flow brakes in advance. Preferably, in case of segmentation along the width, the nozzle plate may be adjusted differently, preferably manually or automatically in the segmented embodiment, in order to be able to produce a plurality of different nozzle forms.

Alternatively or additionally, the nozzle plate may be convexly and/or concavely curved or bendable arranged along the width and/or its length parallel to the air flow.

Alternatively or additionally, for adjusting the elements of the nozzle plate, the guide plate and/or the regulator, an adjusting element is arranged and preferably a control or adjusting device for the adjusting element.

In order to avoid the occurrence of separating vortices at the transition of the slot nozzle to the wind-distribution chamber, a curved deflector (deflection device), preferably a bend (arc), a bend, a guide vane or the like, is arranged on the side remote from the air flow.

Particularly preferably, in the case of slot nozzles extending into the wind-spreading chamber, the region of the nozzle plate remote from the air flow may be provided with a cover, preferably a wall delimiting the wind-spreading chamber from the outlet of the air flow. This is advantageous in particular for protecting the adjusting element optionally arranged behind the nozzle plate. For example, when the rotation axis is adjusted, the cover is meaningful so that dust or material does not deposit behind it and interfere with operation or interrupt operation at some point due to condensation. In most cases, these (dust or material) can be caught by the screen, if necessary.

It can be provided that, for the formation of the slot nozzle, a plurality of slot nozzles are arranged at different distances from the molding belt along the width and/or a plurality of slot nozzles and/or inlets, preferably each with a respective fan.

Alternatively or additionally, a further guide plate may be provided between the forming belt and the slot nozzle, which discharges preferably thicker, less or unaffected material parts affected by the air flow or conveys them to the coarse screen.

In an additional embodiment, for lamination (laminar flow) of the air flow, means can be provided between the fan and the slot nozzle and/or the inlet on the inside of the cross section.

Alternatively or additionally, a deflector may be provided over or adjacent to the slot nozzle such that the falling material has a vector velocity component following or against the airflow as it enters the airflow. In some cases, this makes it possible to maintain a graded (classified) effect at the same or lower airflow rates.

Alternatively or additionally, a flow (flow) stop may be provided between the fan and the inlet, which covers no more than 50%, preferably no more than 45%, most preferably no more than 40% of the cross-section, which is advantageous in particular when using a cross-flow fan.

Preferably, one or two fans may be provided along the width for a4 foot wide wind distribution chamber, and two to four fans may be provided along the width for an 8 foot wide wind distribution chamber.

Alternatively or additionally, a cross-flow fan may be provided as the air flow generating fan, wherein the axial extension of the air flow generating rotary blades of the cross-flow fan is greater than preferably 50%, preferably greater than 75%, in particular greater than 90% of the width of the wind distribution chamber, wherein in particular in the case of a plurality of cross-flow fans the axial extensions of the blades add up along the width.

Alternatively or additionally, the suction opening of the cross-flow fan may have means along its axis of rotation for reducing or differentially regulating the air quantity in width, wherein preferably a perforated plate, a cover strip, a regulator or the like is provided. By reducing the possible suction surface in width, the cross-flow fan can be kept within its preferred operating range and overload can be avoided, which is particularly advantageous.

Alternatively or additionally, in case of a plurality of cross-flow fans, the fans are arranged at different heights and/or suction ports at different angles to each other. Since the cross flow fan generally has an axial side driver (driver looking at the side in the axial direction), it is easier to dispose them adjacent to each other. The formation of the fan shaft (ventilation shaft) can also be simplified to individual fans.

Particularly preferably, the weight separator and/or the filter may be arranged at or before the suction opening of the cross-flow fan, wherein preferably the suction opening has a cross-section substantially downward in the direction of the profiled strip.

Instead of or in addition to the regulator, a perforated plate or similar diffuser may be provided to homogenize the air flow.

It can be provided that the vertical position of the slot nozzle is adjusted independently of the position of the nozzle plate. The height of the nozzle plate or the rotational axis of the nozzle plate is adjustable, including the (part of the) inlet path of the fan. It is particularly preferred that the entire fan system with the nozzle plate, in particular for a cross-flow fan, is adjusted in height.

Furthermore, the features and advantages shown in connection with the wind-spreading chamber according to the invention and the method according to the invention and their respective advantageous embodiments correspondingly apply to each other and vice versa.

With regard to the control and regulation of the invention, it should be explained that in a known manner measuring means and/or rotary milling means can be arranged after the said or additional further dispersing heads for levelling parts of the press pad. The measurements or feedback from these devices are advantageously used to adjust the size, position and/or direction (orientation) of the slot nozzle. In addition, the number of revolutions of the fan and the amount of material entering the wind-spreading chamber, as well as the arrangement and position of the guide plate after the opening (feed opening) for delivering material, can be controlled or regulated.

The air flow generated by the fan is substantially completely introduced into the wind-spreading chamber such that the path from the fan to the wind-spreading chamber or nozzle is substantially sealed from the environment.

In particular, it is now advantageous that the air flow can no longer be introduced only on flat areas, but rather into the falling material blanket starting from the guide plate, and that the material is separated by a rather strong air flow compared to the prior art.

Finally, it is advantageous that the uncontrolled air quantity together with the material and thus through the inlet for feeding the material can no longer have a large influence on the air flow in the wind-spreading chamber by cascading pouring (accumulation) of the material on the one hand and/or can also be homogenized (homogenized) by the strong air flow ejected from the slot nozzle on the other hand. Both solutions can be seen independently of each other and have respective inventive aspects.

A further possible variant for improving the invention may be that along the extension of the connection, between the fan and the inlet at the wind-spreading chamber, the width is doubled, preferably with a constant height, and again reduced to the original width. By expanding, the air flow is positively distributed along the width when the stenosis increases again.

A duct or geometrically matched fan shaft (ventilation shaft) is arranged to supply air at the suction inlet of the fan, preferably with a large cross section, to exclude air turbulence from adjacent equipment parts.

In order to keep the cross-flow fan in the optimum operating range, it is expedient to provide the suction opening with an overpressure, i.e. with a driven air flow by another fan. The two-stage arrangement of the fans, in particular the first axial fan and the further cross-flow fan, is advantageous in that in this way the air flow can be further homogenized.

An overpressure is also understood to mean that in order to supply a sufficient amount of air to the fans of the wind-spreading chamber, if necessary through the previous filters, dehumidifiers and/or longer fan shafts (ventilation shafts), separate fans can be provided for this, which take care of the friction of the air in these areas so that there is sufficient air at the suction opening and by the fans, in particular cross-flow fans, so that the low pressure at the intake side (suction side) is as low as possible. Depending on the type of operation, the cross-flow fan acts as a flow brake and promotes uniform flow of air into the connection or wind-spreading chamber or creates a negative pressure at the suction inlet.

The individual features and advantages of the above individual segments can be interchanged or combined as desired, wherein further advantages over the sum of the individual effects can be brought about.

Further advantages, features and details of the invention are given by the following description, in which embodiments of the invention are further explained with reference to the drawings.

The features disclosed in connection with the drawings, the description and the claims are suitable for individual consideration and can be meaningfully summarized in other combinations for the person skilled in the art.

Further advantageous measures and design configurations of the subject matter of the invention are explained in the dependent claims and in the following description with the aid of the figures.

The drawings show:

figure 1 shows a schematic side view of a wind-spreading chamber according to the prior art,

Fig. 2 shows a wind-spreading chamber according to the invention, with an adjustable slot nozzle for applying an air flow to the material,

Figure 3 shows an enlarged view of the feed zone and slot nozzle according to figure 1,

Figure 4 shows a cross-section through the fan and the connection between the wind-spreading chamber transverse to the wind-spreading chamber in figure 3,

FIG. 5 shows another embodiment of a slot nozzle according to the present invention with an alternative fan design; and

Fig. 6 shows a top view of the suction port of a cross-flow fan with means for reducing the suction port cross-section.

The drawing is schematically shown in fig. 1 in a side view of a wind-spreading chamber 21 according to the prior art. Here, the material 8 enters the wind-spreading chamber from above via the opening 16, is decomposed by the dispersing rollers, and is distributed in the wind-spreading chamber 21 by the air flow 13 entering the wind-spreading chamber 21 via the inlet 14 opposite to the conveying direction of the molding belt 12. After the inlet, guide vanes may also be provided in the wind-spreading chamber 21, which may have a trapezoidal shape and be arranged substantially parallel to the air flow and vertically. Wherein the material 8 hits a screening grid 18, which decelerates portions of the material 8 and serves for its earlier deposition on the forming belt 12 to form a material web (mat) 11. The oversized material, which is only slightly affected by the air flow, falls onto the coarse screen 19 and is removed from the process by coarse discharge means. Instead of the coarse screen, a roller screen (roller screen) may also be provided.

In order to shorten the wind-spreading chamber, a wall 22 influencing the space height 17 may be provided on the ceiling 23 of the wind-spreading chamber 21. At the other end of the wind dispersion chamber 21, an outlet 15 for the air flow 13 is provided, which is optionally connected with a suction device 24. The wind-spreading chamber can also be arranged mirror-image when producing a multi-layer material web (mat).

In fig. 2, a slotted nozzle 1 is shown in operative connection with an inlet 14, which slotted nozzle can be designed to be moved by means of an adjusting element (not shown). For this purpose, the upper nozzle plate 2 and/or the lower nozzle plate 3 can be adjusted relative to each other or separately from each other by means of a suitable drive. The width b is generally used and named transversely to the direction of transport of the material web (pad) 11. It can be used for different device components,

In a separate exemplary embodiment, the material 8 is not guided and disintegrated beforehand via the dispersing rollers, but is guided or deflected as a material blanket via one or more guide plates 6 after the opening 16. Preferably, a cascade of deflector devices with at least two deflections of the material flow is implemented, by means of which a falling material blanket is produced, which is broken up (broken up) by the slot nozzle 1.

In order to be able to more clearly represent the reference numerals, the right-hand part of the wind dispersion chamber 21 is shown enlarged in fig. 3. The material 8 (not shown here) reaches the first guide plate 6 from above, where it is deflected to the second guide plate 6. By deflection of the cascade shape, the material 8 is mixed (homogenized) before being broken up (broken up) by the air flow 13 from the slot nozzle 1. Depending on the type of material or throughput, the guide plate 6 may be adjusted by a drive mechanism (not shown). Preferably, the guide plate is connected to the rotation shaft 5. Several axes of rotation are described below; these are shown by way of example only as a number of conceivable and possible adjustment mechanisms. In the preferred embodiment, the suction opening 27, which is here designed as a cross-flow fan, is directed downwards. The advantage of the above-described embodiment is that in the case of flange-connected air guides, the arc segments can be designed to be upward or the input device itself can be designed to be sideways. The arcuate segment or side input device may be used as a weight separator to prevent dust or foreign matter from entering the wind dispersion chamber. Alternatively or additionally, a filter may be provided.

The adjustable slot nozzle 1 consists of at least one movable nozzle plate 2, 3 at the top or bottom and is preferably hinged to the wall of the wind distribution chamber 21, preferably via a rotation shaft 5.

With the two movable nozzle plates 2,3, the height h of the slot nozzle 1, the size of the slot nozzle, its orientation and/or its position in the wind-spreading chamber can be adjusted.

The slot nozzle can in this case reduce or enlarge the cross section in relation to the wedge-shaped or funnel-shaped flow. The adjusting element may be arranged inside or outside the wind-spreading chamber 21 for this purpose. If they are arranged on the side of the nozzle plates 2,3 facing away from the air flow 13 in the wind-spreading chamber, it is advantageous if these areas are provided with a cover 4 so that the drive mechanism does not become unnecessarily dirty. But even without a drive mechanism, the cover 4 can be used to avoid deposits in the side recesses.

It can be further provided that the adjustment of the vertical position of the slot nozzle is independent of the position (attitude) of the nozzle plates 2, 3. The height of the nozzle plates 2, 3 or the rotation axis 5 of the nozzle plates 2, 3 is adjustable, including the (part of the) inlet path of the fan.

The air flow 13 is generated by the fan 10, preferably a cross-flow fan, and in this example is brought to the wind-spreading chamber 21 or input to the inlet 14 via a substantially rectangular connection 25.

The regulator 9 can be arranged in a connecting piece 25, according to fig. 4, the connecting piece 25 having a plurality of planar elements 26 along the width b, which planar elements 26 are designed to be independently movable or adjustable by means of a drive element (not shown). Due to their different influence on the cross section of the connection piece 25, the air flow 13 can be fine-tuned in the wind distribution chamber 21. For example, these may affect the spreading characteristics across the width of the wind-spreading chamber and at the edges. For example, an edge elevation, i.e. a stronger spreading, may be provided at the edge of the wind spreading chamber.

Fig. 5 shows an alternative but equivalent embodiment of the invention, in which the inlet 14 coincides with the nozzle opening of the slot nozzle 1, because the nozzle plates 2, 3 are not arranged in the wind-spreading chamber, but in front of the wind-spreading chamber along the air flow 13. Also provided at the nozzle plates 2, 3 are covers which are arranged parallel to and move along the outer wall 1625 of the wind distribution chamber 21.

In the combination of the features of fig. 3 and 5, it is conceivable that in the variant according to fig. 3 the rotation shaft 5 can also be designed as a joint, as well as being adjustable in height. This results in a significantly improved adjustability of the slot nozzle 1 on the inlet side of the slot nozzle 1 and on the outlet side relative to the wind distribution chamber. Alternatively, the fan 10 can be adjusted at a distance from the forming belt by means of the connection piece 25 and the slit nozzle.

Furthermore, two parallel effective cross-flow fans are shown, which are arranged one after the other in the view and thus next to each other in the width along the wind-spreading chamber. Preferably, the cross flow fan has two differently arranged air suction ports.

According to fig. 6, one or more devices 28 may be arranged before the suction port 27, which may reduce the open cross-section of the suction port 27. Preferably in an adjustable manner, for example with the aid of the regulator 9 according to fig. 4, for maintaining the cross-flow fan in the optimum operating range 1625. This also indirectly affects the air flow 13.

List of reference numerals 1625

1. Slit nozzle

2 Spray plate (Upper)

3 Spray plate (lower part)

4. Covering piece

5. And (3) rotating the shaft.

6. Guide plate

7. Flow direction

8. Material

9. Regulator

10. Fan with fan body

11 Material web (pad)

12. Forming belt

13. Air flow

14 13, Inlet of the valve

15 13 Outlet of the valve

16 Openings for material 8

17. Space height

18. Screening grille

19. Coarse screen

20 Coarse discharge device (coarse discharge port)

21. Wind distributing chamber

22. Wall with a wall body

23. Top plate

24. Suction device

25 Height of connecting piece h

26 Element b) width

27. Suction inlet

28. And (3) a device.

Claims (23)

1. A wind-spreading chamber for spreading and shaping a free-flowing material onto an endless shaping belt (12) into one or more layers of material webs (11), preferably during the production of material sheets in a press, at which wind-spreading chamber (21) openings (16) for feeding material (8), inlets (14) and outlets (15) for an air flow (13) and a fan (10) for generating an air flow (13) are arranged, characterized in that at least one slit nozzle (1) is arranged as an inlet (14) for an air flow (13) or at the inlet (14) that is variable in terms of size, direction and/or position in the wind-spreading chamber (21).

2. Wind-spreading chamber according to the preceding claim, characterized in that the width of the slot nozzle (1) essentially corresponds to the width (b) of the wind-spreading chamber (21) and/or that the distance of the inlet (14) from the profiled strip (12) is adjustable.

3. Wind-spreading chamber according to one or more of the preceding claims, characterized in that at least one movable nozzle plate (2, 3) is arranged to adjust the height (h) of the slot nozzle (1) and/or the inlet (14) or the height (h) of the slot nozzle (1) can be adjusted between 10mm and 400mm, preferably between 80mm and 180 mm.

4. Wind-spreading chamber according to one or more of the preceding claims, characterized in that between said fan (10) and said slit nozzle (1) there are arranged substantially rectangular connectors (25), regulators (9) and/or permeable baffles or perforated plates for influencing or homogenizing said air flow (13).

5. Wind-spreading chamber according to one or more of the preceding claims, characterized in that, in order to influence the cross-section of the air flow (13) and/or the connection piece (25) for the air flow (13), a movable element (26), preferably a plurality of elements which move into and out of the cross-section along the width (b), are arranged, preferably adjustably, between the fan (10) and the slot nozzle (1).

6. Wind-spreading chamber according to one or more of the preceding claims, characterized in that between the inlet (16) and the slot nozzle (1) there are arranged dispersion rollers and/or guide plates (6), wherein preferably at least two guide plates (6) are arranged for multiple deflection of the material (8).

7. Wind-spreading chamber according to one or more of the preceding claims, characterized in that the nozzle plates (2, 3) are differently adjusted along the width (b) of the slot nozzle (1) and/or over their height (h), preferably manually or automatically.

8. Wind dispersion chamber according to one or more of the preceding claims, characterised in that said nozzle plates (2, 3) are arranged convexly and/or concavely curved or bendable along their width (b) and/or their length parallel to the air flow (13).

9. Wind dispersion chamber according to one or more of the preceding claims, characterized in that for the adjustment of the nozzle plates (2, 3), the guide plates (6) and/or the elements (26) an adjustment element is arranged and preferably a controller or regulator for the adjustment element.

10. Wind-spreading chamber according to one or more of the preceding claims, characterized in that, in order to avoid separating vortices at the transition from the slot nozzle (1) to the wind-spreading chamber, a curved deflector, preferably a bend, a guide vane or the like, is arranged on the side remote from the air flow.

11. Wind-spreading chamber according to one or more of the preceding claims, characterized in that in the event that the slot nozzle (1) protrudes into the wind-spreading chamber (21), the region of the nozzle plate (2, 3) remote from the air flow (13) is provided with a cover (4), preferably a wall of the cover is provided from the outlet of the air flow (13) to the delimitation of the wind-spreading chamber (21), in particular in order to protect the adjusting elements arranged behind it for the nozzle plate (2, 3).

12. Wind-spreading chamber according to one or more of the preceding claims, characterized in that for forming the slot-nozzles (1) a plurality of slot-nozzles (1) are arranged in width and/or a plurality of slot-nozzles (1) and/or inlets (14) are arranged at different distances from the profiled strip (12), preferably each slot-nozzle is arranged with a respective fan (10).

13. Wind-spreading chamber according to one or more of the preceding claims, characterized in that a further guide plate (6) is arranged between the profiled strip (12) and the slot nozzle (1).

14. Wind dispersion chamber according to one or more of the preceding claims, characterised in that means for laminar flow of said air flow (13) are arranged between said fan (10) and said slot nozzle (1) and/or said inlet (14) on the inside of the cross section.

15. Wind-spreading chamber according to one or more of the preceding claims, characterized in that said deflector (6) is arranged adjacent to said slot nozzle (1) so that said material (8) has a vector velocity component following or against said air flow (13) when entering said air flow (13).

16. Wind-spreading chamber according to one or more of the preceding claims, characterized in that a flow brake is arranged between the fan (10) and the inlet (14), the coverage area of which is not more than 50%, preferably not more than 45%, most preferably not more than 40% of the cross-section.

17. Wind-spreading chamber according to one or more of the preceding claims, characterized in that for a 4 foot wide wind-spreading chamber one or two fans (10) are arranged along its width (b) and for an 8 foot wide wind-spreading chamber two to four fans (10) are arranged along the width (b).

18. Wind-spreading chamber according to one or more of the preceding claims, characterized in that a cross-flow fan is arranged as a fan for generating the air flow (13), wherein preferably the axial extension of the rotating blades of the cross-flow fan generating the air flow (13) is greater than 50%, preferably greater than 75%, particularly preferably greater than 90% of the width of the wind-spreading chamber (21), wherein in particular in the case of a plurality of cross-flow fans the axial extensions of the blades are additive along the width (b).

19. Wind-spreading chamber according to one or more of the preceding claims, characterized in that the suction opening (27) of the cross-flow fan has means (28) along its rotation axis for adjusting the air quantity adjustment in a reduced or differentiated manner in width, wherein preferably a perforated plate, a cover strip, a regulator (9) or the like is arranged.

20. Wind dispersion chamber according to one or more of the preceding claims, characterised in that in the case of a plurality of cross-flow fans, these fans are arranged at different heights and/or at different angles to each other at the suction opening (27).

21. Wind dispersion chamber according to one or more of the preceding claims, characterised in that a weight separator or filter is arranged at or before the suction opening (27) of a cross-flow fan, wherein preferably the suction opening (27) has a cross-section substantially downwards in the direction of the profiled strip (12).

22. Wind-spreading chamber for spreading and shaping a free-flowing material (8) into one or more layers of material web (11) on an endless shaping belt (12), preferably during the production of material sheets in a press, in which wind-spreading chamber (21) openings (16) for feeding the material (8), an inlet (14) for an air flow (13) and an outlet (15) are arranged, characterized in that as the fan (10) at least one cross-flow fan for generating the air flow (13) is arranged.

23. Method in a wind-spreading chamber for spreading free-flowing material over an endless forming belt (12) and forming it into one or more layers of material web (11), preferably during the production of a material sheet in a press, material (8) being introduced into the wind-spreading chamber (21) through openings (16) and being deposited separately on the forming belt (12) by means of an air flow (13) flowing through the wind-spreading chamber (21), wherein the air flow is generated by the fan (10), enters through the inlet (14) and exits from the wind-spreading chamber (21) through the outlet (15), characterized in that the air flow (13) is conveyed through a slit nozzle (1) to the wind-spreading chamber (21) for applying the material (8), wherein the slit nozzle (1) and/or the inlet (14) are adjusted with regard to its size, direction, position and/or distance from the forming belt (12).