DE102006028392B4 - Method, installation and scattering machine for scattering a multilayer pressed material mat in the course of the production of wood-based panels - Google Patents

Abstract

Scattering machine (1) for scattering a layer of a multilayer pressed material mat (9) from spreading material in the course of the production of wood-based panels, wherein the spreader (1) itself is arranged vertically adjustable and arranged from the grit entry to the scattering rollers (4) fixedly arranged spreading machine walls (2) are parallel to the conveying direction of the forming belt (10) arranged spreading machine walls (2) and the outer diameter (A) of the scattering rollers (4) substantially at the same height limit the lower end of the spreader (1) and parallel to the conveying direction per longitudinal side of the forming belt (10) below the core diameter (K) of the scattering rollers (4) is arranged independently of the spreading machine (1) vertically movable scattering wall (3).

Description

The invention relates to a spreader for scattering a multilayer pressed material mat from grit in the course of the production of wood-based panels according to claim 1. Further, a system for scattering a multilayer pressed material mat and a method for layered scattering is presented.

In principle, methods, systems and scattering machines for filling or scattering small particles or large chips or chips have already become known. The relevant technologies have become known for particles and / or small chips under the generic term MDF board production, where MDF stands for medium-density fibers. But also in the field of OSB production, OSB stands for oriented scattered plates, generic systems and methods were published.

The improvements made in recent years are generally related to improvements in spreading quality by various types of spreading machines or improvement in the treatment of the spread material to final pressing by means of batch or continuous press lines. Basically, in the foreground of the necessary mass production, a continuously equivalent product with different parameters has to be created. The size, type and density of the scattering particles used (input variables) play an important role, as do the parameters of the final product with regard to density, thickness and type (output variables) of the material plates to be produced. It is always in the background of the overall economic context to consider and by the client plants are preferred, which are able to produce a wide range of different large plate thicknesses. The areas of the chipboard thicknesses to be produced in a system range from 3 mm thick thin plates to 60 mm thick worktops. Nevertheless, up to 120 mm thick beam products are produced even on such systems. Converted to a spreading line for the preparation of pressed material mats to be pressed, this means that a spreading line should be capable of sprinkling pressed material mats of a height of 10 mm up to a height of 1200 mm with constant quality. In addition to the spreading height, it should be noted that the spreading machines used have to ensure a constant throughput of material in order to avoid density fluctuations in the pressed material mat and thus product quality fluctuations. In principle, the problem of producing differently high press material mats is achieved by arranging a plurality of scattering machines in succession and making them height-adjustable above the forming belt to which the pressed material mat is sprinkled. The problem here are the lateral seals of the pressed material mat in the conveying direction of the forming belt. It should be noted in principle that each spreader has various types of rollers to dissolve the grit, to classify and / or oriented to place on the forming belt. Typically, opening rollers are arranged at the top of the grit entry of the spreader and distribute the grit on the arranged below in the spreader spreader rollers.

Decisive for the scattering quality is now the distance of the scattering rollers to the forming belt or the already existing top layer of the pressed material mat. It is known that at a large distance from suitable for orientation scattering rollers to the spreading surface, the grit falls unoriented and at a small distance orientation is possible. Experience shows that at a distance of more than 20 cm from the spreading surface, a spreading roller suitable for orientation deposits the spreading material unoriented, since the drop height is sufficient for the spreading material to twist. This also makes it understandable why a small scattering height distance is necessary to produce an oriented scattered pressed material mat. The exact distances are of course dependent on the type of scattering rollers and the grit itself.

In addition to the height adjustment of the scattering rollers to the spreading surface but eie problem is equal to all spreaders: the sealing of the spreader to the forming belt to avoid escape of the grit at the longitudinal edges of the spreader. In addition to the resulting defective bulk in the edge region of course, the pollution of nearby stehnden plants and devices by dust or large chips or chips is an undesirable problem.

The patent literature already knows various proposals for solving this problem. So is with DE 22 54 064 A a fleece conveyor device has become known, which has set itself the task of achieving a seal between the forming belt and spreader, with as little material as possible to escape laterally and at the same time an optimal spreading of a nonwoven fabric can be made possible. In addition, this spreader should be able to operate with low wear. To achieve this is proposed to arrange flexible sealing members in the side walls, which rest with its lower edge on the conveyor base (forming belt) and thus lead to a seal. DE 22 54 064 A offers no solution, as in the case of several spreading machines an adjustment is given to form different fleece heights, but has only rigid side walls, which are provided with "sealing lips". In addition, the sealing Side wall has projections in the region of the longitudinal seal, which can lead to problems due to jammed grit or leaks, since the lateral side wall to guide the scattered material to be spread is not smooth but has gradations.

With DE 38 41 276 C1 a spreading machine for the spreading of wood chips has become known, which should allow a height adjustment of the scattering head in the production of different thickness Pressgutmatten while maintaining good longitudinal seal. For this purpose, a lateral boundary track is attached to the spreading head (scattering machine) and deflected in the region of the forming belt. The boundary track consists of a flexible material and is loaded by weights to tension them. Thus, although this device has a continuous smooth surface against the grit and also allows a proper seal, but requires on the one hand tribologically sensitive boundary paths that can be made by low material costs reasonably wear and tend to caking by glue residue and the grit. The proposed use of a continuous plastic, rubber or fabric web is particularly prone to caking or edging of vorbeifallendem or -schleifendem grit. By hanging weights in order to obtain sufficient tension in the boundary track for proper guidance of the material to be spread requires on the one hand a high-quality and sufficiently strong material, possibly with reinforcing fibers, and on the other prevents proper circulation around the deflection in the region of the forming belt. Another disadvantage is the use of large installation space, because the double deflection and the weights need a lot of space that can be useful for other system elements or must. The maintenance of the spreader is a problem, so the weights must be removed and stored when opening the lateral boundary track and then the de Begrenzungsbahn has to be laboriously threaded out or disassembled from the scattering head to get to the inside of the spreader.

Furthermore, the adjustment of the blind-like boundary track during operation is not unproblematic. On the one hand, the regular application of resin residues leads to a stiffening of the boundary track and so to problems in the first circulating roller in the vicinity of the forming belt, on the other caking, which are drawn through the gap between pulley and forming belt damage the forming belt itself or the boundary track and lead to problematic signs of wear. In the worst case, the caking is sheared off and carried as a glue lump in the pressed material mat. In systems with a lateral compression rail in front of the inlet of the continuously operating press in order to achieve an edge density increase of the material plate, these glue lumps can lead to damage to the press used.

The present invention has now taken on the task of providing a method, a system and a spreader for scattering a Pressgutmatte in the course of the production of material plates that does not have the disadvantages mentioned above and besides it allows before or during the scattering of new layers of Pressgutmatte already scattered Treat layers with regard to their parameters while improving operational safety and repair options.

The solution for the method is that after formation of a first layer of a pressed material on a forming belt in a first spreader in the following spreaders along the longitudinal edges only an upper region of the existing Pressgutmatte is sealed and guided by means of scattering walls.

The solution for a system for scattering of a multilayer pressed material mat is that at least the first spreader for forming the pressed material mat on the forming belt per longitudinal side has a fixed scattering wall and that at least the last spreader (below the core diameter of the spreader rollers) per longitudinal side regardless of the spreading machine has vertically movable scattering wall.

A spreader with features to a solution of the problem is that in the spreader parallel to the conveying direction of the forming belt arranged scattering walls and the outer diameter of the spreader roll substantially at the same height limit the lower end of the spreader and that parallel to the conveying direction per longitudinal side of the forming belt below the core diameter of the scattering rollers is arranged independently of the spreading machine vertically movable scattering wall.

In the system according to the invention, it is otherwise irrelevant whether only the spreader rollers are arranged to be adjustable in height even for different heights of Pressgutmatten or whether the entire spreader is designed to be height adjustable. Usually, the latter embodiment is used, since the distance between opening rollers and scattering rollers is usually predetermined or optimized. This is technically due to the fact that the core diameter of the dissolving or scattering rolls are normally carried out in openings in the lateral walls of the spreader. Within the spreader then have the Disassembling or spreading rollers, depending on the application, orientation discs, orientation compartments or spikes on which define the outer diameter of the dissolving and spreading rollers. A seal in rotationally symmetrical perforations of the lateral spreading machine walls is usually common and technical standard. In the execution problematic or expensive is the opening of the scattering walls in the passages for the core diameter of the rollers in the form of grooves or the like. Here, awkward and expensive blinds and scrapers must be introduced in the spreading machine walls, which complicate the structure and bring unpleasant side effects due to escaping grit in disturbances. In particular, the area of bearings and drive motors can be damaged in uncontrolled dust discharge. In addition, such breakthroughs in the side walls always entail the risk of caking of grit and, associated therewith, the demolition of lumpy and compacted material which can get into the pressed material mat.

The existing devices and systems according to the prior art have shown no way how to achieve with minimal technical effort a highly effective and simple side guide with sealing properties in the scattering plane while height adjustability of the spreaders on different spreading heights with continuous smooth as possible and spill-free spill walls ,

It has been shown in the scattering production of flat chips or chips that the scattered layers already has sufficient lateral strength due to their homogeneous scattering, that the edges of the layers of a pressed material mat do not crumble, if already some material is additionally accumulated. This applies especially to flat spreading material such as chips or shavings, but also particles with a corresponding glue application are quite able to have a certain lateral stability without being compacted. The usual applied edge density increase by obliquely towards Pressgutmittenlängsachse employed scattering walls results in a further solidification of the edge region, so that for example in two or three scattered layers, the lowest layer of support no longer needed. This is particularly the case with oriented scattered pressed material, since here the weight of the top scattered material ensures good stability of the edge region. Accordingly, it is provided in the context of the invention to dispense with a support of the lower already "covered" with further spreading material layers or areas and only in the upper part of a Pressgutmatte to guide laterally and support.

Expediently, a parameter check of individual or several layers can now take place in the exposed areas of the pressed material mat and these can additionally be treated or checked with the parameters of the press material mat adjusting fluids or, for example, high-frequency radiation. Thus, such pressed material mats are irradiated by X-rays to detect excessive density or glue lumps or they are subjected to steam, a vapor-air mixture or other fluids. It is also conceivable the introduction of components of a multi-component adhesive in the pressed material mat.

Advantageously, the features of the invention thereby help that in an exemplary product change from a 90 mm thick chipboard to a 9 mm thick chipboard and preferably at the same bulk density of the starting material for input material instead of a 1.2 m high Pressgutmatte only a 0.12 m high Pressgutmatte can be scattered without the distance from the outer edges of the scattering rollers is changed to the surface of the pressed product mat. This has the consequence that in a system with multiple scatter stations, the last spreading station has to overcome almost one meter of height difference to move from a spreading height of 1.0 to 1.20 m to 0.1 to 0.12 m. This example is able to show that fixed lateral scattering walls must have either vertical apertures with cumbersome groove seal for the core diameter of the scattering rolls, which are moved down or it must be arranged below the core diameter of the scattering rollers telescopically or louver-like movable the scattering walls. Such solutions are but cumbersome in use, maintenance and application by edges having and perforated scattering walls. Incidentally, the numerical examples or dimensions given are in no way limiting for the inventive idea, but represent an advantageous embodiment. Furthermore, the continuous guidance of the full height of the pressed material mat at a current maximum spreading height of 1.2 m quite disadvantageous. Does it lead to increased friction on the guide surfaces of the scatter wall panels. This is due to the fact that the lower layers undergo compression due to scattering of several layers lying on top of each other. However, especially in the outer region on the longitudinal edges of the pressed material mat, the already mentioned edge density increase usually takes place during the scattering, so that a stronger compression takes place here than in the longitudinal center region. This edge density increase becomes problematic from the second or third spreading machine, since the pressed material mat presses minimally outwards and thus rubs against guide plates or scattering walls. The carefully spread homogenous pressed material mat is here in the Randbereich unwanted shifts of the material to be spread or Schnitzel up to partial Aufkantungen of the material to be spread and associated undesirable side effects during hot pressing. This can lead to scattering of oversized chips at high density peaks to emergency shutdown of the plant, especially since the steel strips of a continuously operating press sensitive to density peaks.

The advantage is therefore a low coverage of the upper portion of the pressed material mat of about 5 to 30% by means of a lateral scattering wall, especially in oriented scattered chips for the production of oriented scattered OSB or plywood boards. As already described, the uncovered areas of the pressed material mat height can be used to attach measuring devices to or in the pressed material mat. Advantageously, penetrating measuring devices would be arranged along the forming belt in the press material mat, with no disturbing lateral guide walls being present in the lower regions of the press material mat. For this purpose, a steam-air mixture, pure steam or cooling air can be introduced into the lower layers of the pressed material mat for setting parameters with regard to the humidity or temperature. It would also be conceivable to inject fluids containing hardener into the pressed material mat in order to activate the chemical compound reactions, for example in the lower cover layers, depending on the choice of parameters. Of course, after scattering of the cover layers, for example after the first or second scattering machine, it is particularly advantageous to treat them specifically with steam or a vapor-air mixture before or during the scattering of the first middle layer. In specially oriented scattered different layers, this is even conceivable in later scattering machines, since usually smaller particles, chips or chips are used in the outer layers and the middle layers are scattered with large-area material. This results in a kind of sealing effect between the cover and middle layers, so that a targeted lateral passage of fluids purely in the outer layers directly above the forming belt is conceivable.

In a system consisting of several scattering machines, the number of spreaders and their configuration may vary depending on the end product, for example, the first and second spreaders may each scatter two top layer layers of low height but high density and the two center spreaders may apply two low density layer middle layers high altitude. Accordingly, it is possible to equip the first scattering machines purely with fixed side walls or spreader walls and to provide at least only the last spreader with an independently vertically movable spreader wall. But it is crucial that usually the movable spreading walls have only a maximum height which corresponds to little more than the distance from the core diameter to the outer diameter of the scattering rollers. For example, in one embodiment, the core diameter of a spreader roll would be 20 cm, and the spreader disks or spreader spreaders present in the spreader would have an outer diameter of 60 cm. Accordingly, in order to be able to lower the spreader to a few centimeters above the forming belt, the height of the vertically displaceable spreader wall should not exceed 25 cm. In a maximum retracted state so can lay the spreader with a minimum distance of the spreader rollers to the forming belt of 5 cm grit. This embodiment is also not to be understood as limiting the interpretation of the scope, it is only for better understanding in understanding the teachings of the invention and shows only a preferred option. However, such a spreader can with the lateral scattering wall seal a distance of 20 cm between the uppermost layer of a Pressgutmatte and still covers 5 cm of the already scattered Pressgutmatte. With a maximum utilization of this design it would be possible to create a 1.2 m high pressed material mat with 6 spreading machines, provided that each spreading machine uses the maximum spreading height of 20 cm with an overlap of 5 cm. Since the latter spreaders usually have the largest travel, it may be necessary to extend the vertical extent of the sliding scattering wall. This can be done in spreaders with extreme height adjustments, characterized in that the scattering wall consists of two parts, with a part over the longitudinal axis of the formbandseitigen edge is arranged hinged, and as needed at high Pressgutmatten the scattering wall would be extended to a maximum of twice. The flaps can be carried out with hydraulic or pneumatic actuators. Moreover, the scattering walls can still have an inlet extension, in the form of, for example, an inlet radius or an inlet slope around the incoming upper longitudinal areas of the pressed material mat, which may have slipped slightly by vibration of the forming belt between the travel of two scattering machines to the outside again slightly to push inwards , Again, it is sufficient to bring the upper layers of Pressgutmatte back into the right shape, since the lower layers of the pressed material mat do not tend to lose their shape.

In a further embodiment, the vertically movable scattering walls can be displaced in the direction of the longitudinal center axis of the pressed material mat in the direction of the strip side in order to promote a density increase during the scattering of a layer in the edge region.

With regard to maintenance, the most obvious advantage is that, in the meantime, or in the case of a blockage of the spreader, the lateral vertically movable walls are simply moved upwards into the area of the spreader and so the spreading area is made accessible with the simplest means. Just the replacement of spreader rollers is thus possible in a simplified manner without having to dismantle cumbersome side walls or blind boxes. Also, the necessary space is limited to drives for height adjustment which can be arranged at the end of the scattering machine and the reinforced scattering wall itself. Basically, it is of course possible to connect the drives for height adjustment of the height-adjustable spreader, this does not change the fact that the scattering wall yet is arranged independently movable independently of the spreader.

Further advantageous measures and embodiments of the subject matter of the invention will become apparent from the dependent claims and the following description with the drawing.

Show it:

1 a schematic section through the lower portion of a spreader on a forming belt with lowered spreader (left) and raised spreader (right),

2 a schematic side view of a plant for the production of wood-based panels consisting of several spreading machines and a press in the production of thin wood-based panels (above) and thick wood-based panels (bottom).

Since the introduction already makes extensive reference to the state of the art with reference to patent literature, it suffices only for the decisive area of a scattering machine 1 just above the band 10 in 1 display. Here, the grit entry is performed above the conventional opening rollers, not shown, and limited in the spreader by the all-round rigid spreader walls 2 , The direction of the fall 12 for the spreading material is directly on the spreading rollers 4 directed. As in 1 The left-hand illustration in the lowered position can be seen in the scattering machine 1 a thin existing pressed material mat 9 on the form band 10 , Here is the vertically movable scattering wall 3 in the direction of the core diameter K of the scattering rollers 4 moves and slides behind the fixed spreading machine walls arranged there 2 , The amplifications shown amplified 5 the spreading machine walls 2 serve as a seal and possibly also as a bearing of the scattering rollers 4 and their spreader drives 8th , In a spreader 1 Now you can use several spreading rollers 4 be arranged at the same distance to the forming belt or rising in the working direction. The left half shows in 1 while the use of scattered roofs 6 on the core diameter K of the scattering roller 4 , These serve as a rule for the transverse orientation of the material to be spread during the scattering. In the right embodiment find lenses 7 for longitudinal orientation of the material to be spread. Both applications have in common that by the orientation means on the core diameter K of the scattering rollers 4 an outer diameter A is formed. The area between the underlying outer diameter A and the surface of the forming belt or the already spread Pressgutmatte 9 is the spreading area, by means of the vertical drives 11 height-adjustable spreading walls 3 to be sealed. As already sufficiently stated, it is sufficient only the upper portion of the pressed material mat 9 in the further course of the spreading machines ( 1 . 1' . 1'' to 2 ) by means of a scattering wall 3 respectively. It is crucial that the scattering walls limiting the spreading area 3 have smooth and even surfaces to optimize the dispersion in the edge area. In an angular employment of the scattering walls 3 and / or the spreader walls 2 an edge density increase can be adjusted to the longitudinal center axis of the pressed material mat, this being preferred by the scattering machine walls set over the spreading rollers 2 happens. Accordingly, only the spreading machine walls 2 angled, since the scattering walls 3 as perpendicular as possible to the form band 10 should be arranged. An advantage of an embodiment of the scattering machine such that the fixed spreading machine walls 2 with their seals 5 not further in the direction of the forming belt from the spreader 1 protrude than the outer diameter A of the scattering rollers 4 , This ensures that the spreading area only by the vertically displaceable scattering wall 3 optimally guided and sealed.

As the vertical drives 11 for height adjustment of the scattering walls 3 in the inlet and outlet of the spreading machines 1 are arranged, advantageously enough space is available to between these devices 14 provide a treatment of the pressed material mat 9 allow with steam, a vapor-air mixture or other fluids. Also, the devices can 14 Means for checking or irradiating the pressed material mat 9 exhibit. Depending on the application, these devices 14 Of course, also come between the spreaders for use or there as a special unit even the pressed material mat 9 be arranged spanning.

In the not to scale 2 is a complete system for creating a pressed material mat 9 on a form band 10 shown, which example 6 scatterers 1 . 1' . 1'' , ... 1n with a form band running underneath 10 and a subsequent press 13 shows. To the problem of the different spreading heights of a pressed material mat 9 In the case of the upper plant, a minimal scattering height was shown, in the lower plant a maximum scattering height. The press shown here 13 is a continuous press with two rotating steel belts, but can also be designed as a floor or multi-daylight press. In this case, the Pressgutmatte would have 9 either scattered on screens (not shown) or split in front of the discontinuous press. Due to the graphic inaccuracy was based on a marking of the scattering walls 3 in 2 waived. In further embodiments, it would be conceivable that between in the first or second gap between the spreaders 1 . 1' and 1'' Device for the targeted treatment of the on the forming belt 10 lying cover layers are arranged with fluids or electromagnetic waves.

LIST OF REFERENCE NUMBERS

1

spreader

2

Spreaders wall

3

Scattering wall (movable)

4

spreading roller

5

execution

6

Spreading fan (transverse)

7

lenses

8th

Spreading roller drive

9

press material mat

10

forming belt

11

Vertical drive scattering wall

12

Fall direction spreading material

13

Press

14

contraption

K

core diameter

A

outer diameter

Claims (19)

Spreader ( 1 ) for scattering a layer of a multilayer pressed material mat ( 9 ) from grit in the course of the production of wood-based panels, wherein the spreader ( 1 ) is even height-adjustable and from the grit entry to the scattering rollers ( 4 ) fixedly arranged spreading machine walls ( 2 ) are arranged, wherein parallel to the conveying direction of the forming belt ( 10 ) arranged scattering machine walls ( 2 ) and the outer diameter (A) of the scattering rollers ( 4 ) substantially at the same height the lower end of the spreader ( 1 ) and parallel to the conveying direction per longitudinal side of the forming belt ( 10 ) below the core diameter (K) of the scattering rolls ( 4 ) one independently of the spreader ( 1 ) vertically movable scattering wall ( 3 ) is arranged. Scattering machine according to claim 1, characterized in that the maximum height of the vertically movable scattering wall ( 3 ) half of the outer diameter (A) of the scattering rollers ( 4 ) does not exceed. Scattering machine according to claims 1 or 2, characterized in that the scattering wall ( 3 ) and / or the spreading machine walls ( 2 ) are arranged to adjust an edge density increase at an angle of up to 5 ° to the vertical pivot. Spreading machine according to one or more of claims 1 to 3, characterized in that the scattering walls ( 3 ) opposite to the transport direction have an inlet extension in the form of an inlet radius or an inlet slope. Scattering machine according to one or more of claims 1 to 4, characterized in that the vertical drives ( 11 ) for height adjustment of the scattering walls ( 3 ) are arranged in the spreader inlet and / or - spreader outlet. Scattering machine according to one or more of claims 1 to 5, characterized in that as vertical drives ( 11 ) for height adjustment of the scattering walls ( 3 ) are arranged single or double-acting hydraulic or pneumatic cylinders. Scattering machine according to one or more of claims 1 to 5, characterized in that as vertical drives ( 11 ) for height adjustment of the scattering wall linear conveyors such as belt or ball drives are arranged. A method for scattering a multi-layer Pressgutmatte from chips or chips in the course of the production of Holzwerkstoffplattenmittels with a platen press or a continuously operating press with two circumferentially arranged endless steel belts, being scattered in the production direction in front of the respective press by means of spreading machines a multilayer pressed material mat on a forming belt, this Pressgutmatte then introduced into a press and there brought into a final shape using pressure and heat, characterized in that after the beginning of the dispersion of a pressed material on a forming belt in one or more scattering machines in the subsequent spreading machines along the longitudinal edges only an upper region of already spread pressed material mat is sealed and guided by means of scattering walls. A method according to claim 8, characterized in that the upper portion of the Pressgutmatte comprises 5% to 30% of the existing height of the pressed material mat. A method according to claim 8 or 9, characterized in that the chips or shavings are scattered oriented for the Pressgutmatte. Method according to one or more of claims 8 to 10, characterized in that 4 to 6 spreading machines are used to produce a 1.2 m high pressed material mat. Method according to one or more of claims 8 to 11, characterized in that after the first scattering machine, the exposed areas of the pressed material mat are controlled or treated with respect to their parameters between or in the scattering machines. Method according to one or more of claims 8 to 12, characterized in that to control the parameters of the pressed material mat in the scattering machines between the forming belt and the scattering wall measuring devices are introduced or introduced into the pressed material mat. Method according to one or more of claims 8 to 13, characterized in that the measuring devices are used either stationary or co-rotating to Pressgutmatte. Method according to one or more of claims 8 to 14, characterized in that for adjusting the parameters of the pressed material mat in the scattering machines below the scattering wall, a steam-air mixture or a steam mixture for heating or a cooling gas is supplied for cooling. Method according to one or more of claims 8 to 15, characterized in that the layers are flowed through with a hardener gas. Method according to one or more of claims 8 to 16, characterized in that only the scattered layers of Pressgutmatte be treated for the outer layers. Plant for scattering a multilayer pressed material mat from oriented scattered chips in the course of the production of oriented scattered wood-based panels (OSB), consisting of several scattering machines arranged in series ( 1 ), the spreading machines ( 1 ) opposite the forming belt ( 10 ) are arranged adjustable in height, characterized in that at least the first spreader ( 1 ) has a fixed scattering wall on the forming belt per longitudinal side to form the pressed material mat and that at least the last spreading machine ( 1 ) below the core diameter (K) of the scattering rolls ( 4 ) each longitudinal side one independent of the spreader ( 1 ) vertically movable scattering wall ( 3 ) having. Plant according to claim 18, characterized in that starting from the first spreader ( 1 ) the scattering walls ( 3 ) opposite to the transport direction have an inlet extension.

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