CN210389562U

CN210389562U - Distribution device

Info

Publication number: CN210389562U
Application number: CN201790001063.6U
Authority: CN
Inventors: I·万格鲁维; K·普鲁托斯基; B·别尔费尔德特; G·冯哈斯
Original assignee: Dieffenbacher GmbH Maschinen und Anlagenbau
Current assignee: Dieffenbacher GmbH Maschinen und Anlagenbau
Priority date: 2016-07-14
Filing date: 2017-07-14
Publication date: 2020-04-24
Anticipated expiration: 2027-07-14
Also published as: DE102016113014A1; WO2018011430A1; DE102016113014B4

Abstract

The invention relates to a spreading apparatus (1) having at least one first spreading head (2) for spreading a material flow (11) quantitatively fed thereto onto a forming belt (70) arranged below the spreading head, the spreading head comprising an air spreading chamber (20) having at least partially gas-permeable walls (31) at lateral sides (3), which walls are in operative connection with a blower device (30) for introducing a gas flow (32) into the air spreading chamber (20), the spreading head having at least one distribution device (40) for distributing the material flow (11) onto the forming belt (70), the distribution device preferably being below the gas flow (32). The utility model is characterized in that: the distribution device (40) has an extension starting in the wind distribution chamber (20) and extending beyond the wall (31).

Description

Distribution device

Technical Field

The present invention relates to a spreading device, in particular for producing at least a part of a spread mat in the course of producing material boards.

Furthermore, the invention also relates to a method for producing a spread mat in a process for producing a material board.

Background

In the production of material boards, in particular particle boards, from a dispersible material, a mixture of particulate or fibrous material and a binder is dispersed on a forming belt or conveyor to form a dispersion mat, wherein the dispersion mat is subsequently fed, if possible, to a desired preconditioner and finally to a pressing machine. In this case, the pressing can be carried out continuously or discontinuously by means of pressure and/or heat.

The design of the spreading device for producing such material boards depends in most cases on the type of material used, in particular the type of chips or particles, and the most suitable method, in order to lay down or spread these chips on the forming belt as uniformly as possible with respect to the weight per unit area. The sorted (separierend) spreading of the chips or other free-flowing materials can be effected, for example, by means of at least one of the following machine types and equipment types:

-rolling element spreading heads with sorting (Separation, fractionation) by different gap widths between the rolling elements;

-a throwing head with sorting by pulses and accompanying braking in the air; and/or

Wind spreading (device) with sorting according to the principle of horizontal screen machines (horizontal screen machines), and is therefore sometimes also referred to in the art as "wind screening".

In this case, in particular rolling element scattering heads are more frequently used for scattering relatively coarse material, for example for scattering the material of the inner layers in a multilayered material sheet. In contrast, sorting and distribution by wind spreading is particularly suitable in the case of the production of the cover layer of a multilayered material sheet, since finer, well-distributed spreading materials by air flow are generally used here.

Such a spreading device, spreading head and spreading method are known from a number of publications, for example from DE 19846106 a 1.

Rolling element scattering heads for homogenizing the scattering in an air scattering chamber are known from publications EP 800902B 1 and EP 1480797B 1.

It is also known, in particular during the production of multilayered material sheets, to envisage a spreading device which is built up from a plurality of spreading heads arranged one behind the other, wherein a wind spreading head is provided for producing a covering layer from a fine fraction of the material to be spread and a rolling body spreading head, for example, is provided for producing an inner intermediate layer from a coarse fraction of the material to be spread.

Such known spreading devices generally require a separate device for feeding the spreading material for each spreading head; the material to be spread is prepared for spreading in such a spreading device, in an upstream method step as well, by a corresponding spreading head, and in particular is pre-sorted according to a screening of the particle size. This disadvantageously extends the duration of production and its consumption.

Furthermore, the floor space (space requirement) of these known spreading devices is relatively large due to the successive arrangement of a plurality of spreading heads, which likewise has a negative effect on the economy of the production process or on the production of the spread mat.

SUMMERY OF THE UTILITY MODEL

Starting from this, the object of the invention is to provide a spreading device for producing a spread mat which is improved over the prior art, as well as a method for producing such a spread mat. In particular, the material flow, which is composed at least of fine and/or coarse fractions, should be able to be equally homogeneously and sorted distributed into a multi-layered scattering mat by means of only one scattering head of the scattering device.

The invention relates to a spreading device of this type for producing at least one part of a spread mat at least partially by means of air spreading, having at least one first spreading head for spreading a material flow quantitatively fed thereto onto a forming belt arranged below the spreading head; wherein the spreading head comprises an air spreading chamber having at least partially gas-permeable walls at the lateral sides, which walls are operatively connected to blower means for introducing a gas flow into the air spreading chamber, wherein the spreading head has at least one distribution means for distributing the material flow onto the forming belt, which distribution means is preferably below the gas flow.

The solution to the task of a scattering device consists in: the distribution device in at least one of the distribution heads has an extension starting in the wind distribution chamber and extending beyond the wall.

Particularly preferably, the distribution device comprises a first section for distributing at least a part of the fine material fraction of the material flow onto the forming belt and a second section for distributing the coarse material fraction of the material flow onto the forming belt.

Preferably, at least one screen is arranged in the gas flow for separating at least the coarse fraction from the fine fraction in the material flow. This enables the thus separated portions to be fed to different sections of the distribution device. This advantageously allows a classified and homogeneous spreading of a two-layer spread mat with a first layer consisting of fine material fractions and a second layer consisting of coarse material fractions by means of only one spreading head of the spreading device according to the invention. In contrast to a spreading head with only sections for the fine fraction, with the second section for the coarse fraction, not only the original distribution device is expanded, but also a homogeneous spreading of the coarse fraction is ensured.

According to the invention, the distribution device is preferably formed by a rolling-element bed consisting of spreading rollers which are driven on the air-flow side in the direction of rotation opposite to the air-flow. The transport of the fine and coarse fractions of the material flow over the forming belt, preferably in the direction opposite to the direction of the gas flow, is ensured by the distribution device being formed by a rolling body bed consisting of spreading rollers.

In the design configuration associated therewith, it has proven effective here for the spreading roller to have a surface contour, preferably a V-shaped surface contour, which results in a uniform distribution of the fine and/or coarse fraction of the material flow onto the forming belt. A spreading roller with such a surface profile, in particular a V-shaped surface profile, advantageously ensures a controlled passage of a defined amount of material between two spreading rollers onto the forming belt. Furthermore, the fraction, in particular the coarse fraction of the material flow, which passes through the spreading rollers through the gaps of their surface profile, is crushed and this limits the granularity of the amount of material spread.

Alternatively, if necessary, additionally, in a further embodiment it is preferred for the second portion to have at least in part a smaller distance (to the forming belt) than the first portion, extending parallel or obliquely to the forming belt, or vice versa. By means of the different spacings to the forming belt, different falling heights of the material to be spread can advantageously be adjusted and thereby different falling speeds of the fine fraction and coarse fraction in the material flow can be balanced. The distribution of the fine fraction and coarse fraction in the material flow from the distribution device onto the forming belt is thus advantageously kept stable. Finally, the section of the distribution device extending obliquely to the forming belt has the advantage that it can follow the mat "growing" in the transport direction by spreading and the falling height of the material can thereby be kept constant.

Furthermore, in a design configuration it is preferred that at least the second section of the distribution device is at least 50%, 75%, 100% or 125% of the extension distance of the first section, or preferably that the distribution device comprises six, twelve or eighteen scattering rollers. Because the longer the extension distance of the second section, the better the coarse fraction is homogeneously and classically spread. Accordingly, the material flow quantitatively fed to the scattering head may comprise a higher proportion of coarse material. The material flow is particularly advantageous, as disclosed according to the invention, not only consisting of a finer covering material but also of a coarser intermediate layer material. Furthermore, by means of the extension of the distribution device, which extends from the wind distribution chamber and beyond the wall, in the space opposite the gas-permeable wall, below the blower device and/or its gas-conducting lines, this otherwise unused installation space can advantageously be used above the forming belt in a meaningful manner for the production process, and the production costs associated therewith are reduced. Finally, the construction of a more compact scattering device is made easier in particular.

In a preferred embodiment, it has furthermore proven effective to arrange means for "waste" discharge at the end of the distribution device extending beyond the wall. The term "scrap" here refers in particular to a conglomerate mass of material or material and/or material impurities with an excessively large grain size, which, when it arrives with the scattering mat in the belt press, may lead to damage of the belt press placed behind the scattering device in the transport direction of the scattering mat. By arranging the device for scrap discharge according to the invention at the end of the distribution device extending beyond the wall, possible scrap in the material flow can be removed and the belt press can thus advantageously be protected from damage.

According to the invention, in a further embodiment, it is preferred that a guide element for generating a substantially laminar air flow is arranged in front of and/or behind the wall. This has the advantage that a distribution which is as uniform as possible and which reaches over the depth of the wind dispersal chamber, in particular a distribution of the fines fraction in the material flow, can thereby be achieved by wind dispersal.

In addition, it has proven effective in a further embodiment of the invention for at least a second or further screen to be arranged behind the at least one screen in the direction of the gas flow, wherein in particular the size of the openings of the respective screen preferably decreases with increasing distance from the wall. In addition to the wind spreading, i.e. in addition to the separation (screening) according to the weight and/or density of the material to be spread, two or more sieves with reduced mesh size ensure the sorting of the fine fraction according to the size of the particle and this results in a finer classification of the fine fraction in the material flow. This has the advantage that the wind-screened particles first reach the forming belt, followed by other fractions (chips) of the fines fraction of the material flow.

Finally, the design configuration of the present spreading apparatus has proven effective in that a second spreading head is arranged behind the first spreading head, the second spreading head being configured as a mirror image (left-right reversed) of the configuration of the first spreading head. By the mirror image arrangement of the two spreading heads according to the invention, a three-layer plate consisting of a cover layer, an intermediate layer and a cover layer (DS-MS-DS) can be produced for the first time with the aid of only two spreading heads, while retaining the advantage of wind spreading.

Alternatively or additionally, at least the scattering rollers may have other contours outside the wind scattering chamber or behind the wall.

Alternatively or additionally, at least a part of the distribution device, preferably the entire distribution device, is arranged to be displaceable, preferably thereby adjusting the proportion of particles screened by the wind or spread by the distribution device.

A method of the type for producing at least a part of a scattering mat by means of a scattering device 1, at least partly by means of air scattering, which method uses at least one first scattering head for scattering a material flow, which is fed quantitatively to the at least one first scattering head, onto a forming belt arranged below the scattering head; wherein the material flow in the wind distribution chamber of the scattering head is accelerated with a gas flow, which is generated by means of a blower device and which is guided at the lateral sides into the wind distribution chamber through at least partially gas-permeable walls, and wherein the material flow in the wind distribution chamber of the scattering head, preferably below the gas flow, is distributed onto the forming belt by means of at least one distribution device.

The task solution mainly comprises the following steps: the distribution device for distributing the material flow has an extension starting in the wind distribution chamber and extending beyond the wall.

Additionally, at least a portion of the fine fraction of the material flow may pass through a first section of the distribution device and the coarse fraction of the material flow may be distributed onto the forming belt through a second section.

Alternatively or additionally, at least one screen can separate the coarse fraction from the fine fraction in the material flow after the wall in the air-dispersing chamber in the air flow (direction) and particularly preferably feed to only one section.

In particular, the fine fraction and/or coarse fraction of the material flow is preferably transported by means of a distribution device on the gas flow side opposite the gas flow.

Particularly preferably, the material flow should be distributed in the second section of the distribution device behind the wall by means of at least six, twelve or eighteen spreading rollers.

Particularly preferably, a method is used for producing a spread mat on a forming belt with at least two arranged spreading heads (2, 4) which are arranged in mirror image (upside down) to each other.

Finally, it has proven effective in one design configuration for the speed of the forming belt to be greater than 1000mm/s, preferably greater than 1500 mm/s. The achievable speed of the forming belt in combination with the determined plate thickness may advantageously define the plant capacity of the press plant: since, the faster the speed of the forming belt can be achieved with the same product quality, the faster the production speed is advantageously increased.

By means of the invention, at least a part of a double-layer scattering mat can be produced at least partly by wind scattering, with the aid of only one scattering head. In particular, the material flow, which is composed of at least a fine fraction and/or a coarse fraction, can be likewise homogenized and sorted into a double-layered scattering mat by means of the one scattering head of the scattering device. In contrast to the spreading devices known from the prior art, not only can a time-consuming preliminary separation of the spread material, for example by means of a multi-stage screen, be avoided when producing a multi-layered material sheet. Furthermore, the number of spreading heads arranged one behind the other within the spreading device can likewise be minimized by the invention. Advantageously, unlike the prior art, this allows the idea of a more compact spreading device for producing multilayered material sheets.

The installation space for distributing the material flow is now used in an advantageous manner, which results in an increased distribution compared to previous wind distribution chambers, which in the prior art only contributes to the generation of the air flow. By this, it is also possible to increase the proportion of coarse material in the material flow of the wind distribution chamber, since it can be optimally distributed by means of an extended distribution device with the same structural length of the wind distribution chamber.

The gas-permeable wall substantially defines the transition of the gas flow out of the blower device and its guide plates. In most cases, this transition is usually defined by a regulator that regulates the gas flow. Basically, the gas-permeable wall of the wind dispersal chamber should be at the end of the wind dispersal chamber, since the gas flow in the wind dispersal chamber comes into play there. The distribution device continues (guides/extends) under the blower device opposite to the air flow according to the invention.

The distribution device generally not only serves as a bulk material feeder and in most cases forms a material flow blanket on the distribution device, but also homogenizes the material flow, which is spread onto the forming belt and likewise along and transverse to the forming belt. The first and second sections of the distribution device may have different characteristics. Other sections with distinguishing characteristics may also be provided, so that a spread in a plurality of distinguishable layers is possible.

Preferably, the coarse fraction is spread outside the wind spreading chamber or behind the wall by means of another profile (pattern) of the spreading rollers.

Alternatively or additionally, at least a part of the distribution device, preferably the entire distribution device, is displaced in or against the production direction to adjust the proportion of particles that are dispersed by the wind sifting or by the distribution device.

Drawings

Other advantages and design configurations are described below in accordance with the preferred embodiments and in conjunction with the following figures.

In the drawings, there is shown schematically:

FIG. 1 shows a first design configuration of a scattering head, in which the individual segments of the distribution device have the same distance to the forming belt;

FIG. 2 shows a second design configuration of the scattering head, in which the second section has a smaller distance than the first section, which extends parallel to the forming belt;

FIG. 3 shows a third design configuration of the scattering head, in which the second section has a distance which extends obliquely to the forming belt; and

fig. 4 shows a design configuration of a spreading device in which a second spreading head is arranged behind the first spreading head, the second spreading head being configured as a mirror image of the configuration of the first spreading head.

Detailed Description

In the following description of the preferred embodiments of the invention, the same reference numerals indicate the same or comparable components.

Fig. 1 shows a first design configuration of a spreading head 2 for spreading a material flow 11, which is fed quantitatively thereto by means of a dosing device 10, onto a forming belt 70 arranged below the spreading head 2, the material flow 11 being composed of at least a fine material fraction 111 and/or a coarse material fraction 112, the spreading head comprising a wind spreading chamber 20 having an at least partially gas-permeable wall 31 at a lateral side 3, which wall 31 is operatively connected with a blower device 30 for introducing a gas flow 32 into the wind spreading chamber 20.

In the wind dispersal chamber 20, behind the wall 31, in the air flow 32 (in the direction of the air flow 32) there is arranged at least one screen 21, or as shown in a preferred design configuration, for example three

screens

21, 22 and 23, for separating at least the coarse fraction 112 from the fine fraction 111 in the material flow 11.

The spreading head 2 has at least one distribution device 40 for distributing the material flow 11 onto the forming belt 70 below one or

more screens

21, 22 and 23.

According to the invention, the distribution device 40 has an extension starting in the wind distribution chamber 20 and extending beyond the wall 31, which extension comprises a first section 401 for distributing at least a part of the fines fraction 111 in the material flow 11 and a second section 402 for distributing the coarse fraction 112 in the material flow 11.

In the wind distribution chamber, there is usually arranged a free section 400, in which the material flow 11 reaches directly onto the forming belt 70, the material flow 11 being classified by the gas flow 32 as now only involving dust in the material flow 11. The dust generally constitutes the surface of the cover layer DS on the forming belt 70.

Fig. 1 shows a first embodiment of the invention, in which the

sections

401 and 402 of the distributor 40 have the same distance to the forming belt 70. The extension of the second section 402 is for example 100% of the extension of the first section 401. In particular, the second section 402 can correspondingly comprise sixteen dispersion rollers 42 like the first section 401.

In order to transport the fine fraction 111 and the coarse fraction 112 in the material flow 11, preferably counter to the direction of the gas flow 32 and preferably above the forming belt 70, the distribution device 40 can be formed in a preferred design from a rolling body bed 41, in particular a rolling body bed consisting of distribution rollers 42, which are driven in the direction of rotation R opposite to the gas flow 32. It has proven effective here for the spreading roller 42 to have a surface profile, preferably a V-shaped surface profile, which can be used to uniformly distribute the fine fraction 111 and/or the coarse fraction 112 of the material flow 11 onto the forming belt 70.

As shown in fig. 1, according to the invention, preferably at the end of the distribution device 40 extending beyond the wall 31, a device 60 for discharging the waste material 113 is arranged, which advantageously makes it possible to remove possible waste material 113 and in this way protects a belt press (not shown) arranged behind the spreading apparatus 1 in the transport direction T of the spreading mat 80 from damage. Guide elements 33 can furthermore preferably be arranged before and/or after the wall 31 for generating a substantially laminar air flow 32.

Finally, it is shown that at least a second screen 22 or further screens, in particular a third screen 23 as can be seen here, can be arranged in the gas flow 32 (in the direction of the gas flow 32) behind the at least one screen 21, wherein the size of the openings of the

respective screens

21, 22 and 23 decreases with increasing distance from the wall 31. This ensures sorting of the fines fraction 111 according to particle size in addition to wind spreading, i.e. in addition to separation (sieving) according to the weight and/or density of the material to be spread, and this advantageously results in a finer classification of the fines fraction 111 in the material stream 11. This has the advantage that the wind-screened particles first arrive on the forming belt 70, followed by further fragments of the fines fraction 111 in the material flow 11.

Fig. 2 shows a second design configuration of the scattering head 2, in which the second section 402 has a smaller distance from the parallel extension of the forming belt (to the forming belt) than the first section 401.

By means of the different distances to the forming belt 70, different falling heights of the material 11 to be spread can advantageously be adjusted and thereby the different falling speeds of the fine fraction 111 and the coarse fraction 112 in the material flow 11 are balanced. The distribution of the fine fraction 111 and the coarse fraction 112 in the material flow 11 from the distribution device 40 onto the forming belt 70 is thus advantageously kept constant. In this design configuration, the extension of the second section 402 is, for example, 50% of the extension of the first section 401. In particular, as can be seen here, the second section 402 comprises eight spreading rollers 42, while the first section 401 comprises sixteen spreading rollers 42.

As shown in fig. 3, in a further advantageous embodiment, the second portion 402 may also have a distance which extends at an angle to the forming belt 70, at least in partial regions of the portion 402. This section 402 of the distribution device 40 can thereby follow completely or partially the material mat 80 "growing" in the transport direction T by spreading, whereby the falling height of the material can advantageously also be kept constant in this case. The preferred extension of the second portion 402 may in this case again be in particular 100% of the extension of the first portion 401.

Fig. 4 finally shows a preferred design configuration of a distribution device 1 according to the invention, wherein then a first distribution head 2 according to the invention is arranged with a second distribution head 4 according to the invention, which is preferably configured as a mirror image of the configuration of the first distribution head 2. Through the mirror image arrangement according to the utility model discloses a two

scattering heads

2 and 4, under the condition that the wind of keeping dispersed, can only produce the three-layer board of constituteing by overburden DS, intermediate level MS and overburden DS with the help of two scattering

heads

2 and 4 for the first time. In particular, it is now possible to introduce the material of the middle layer MS into the two spreading

heads

2, 4, which up to now have been used only for the production of the cover layer DS.

In particular, the production of such a three-layer panel in a scattering installation 1 comprising only two scattering

heads

2 and 4, with wind scattering being preserved, can be achieved by the likewise disclosed method for producing at least a part of a scattering mat 80 according to the invention. The method according to the invention is characterized in that the distribution device 40 has an extension starting in the wind distribution chamber 20 and extending beyond the wall 31, and at least a part of the fines fraction 111 in the material flow 11 is distributed through the first section 401 and the coarse fraction 112 in the material flow 11 is distributed through the second section 402, particularly preferably by means of transport of material opposite to the gas flow 32. A design configuration has proven effective here, in which the speed of the forming belt 70 can be greater than 1000mm/s, preferably greater than 1500mm/s, since the faster the speed of the forming belt 70 can be achieved, the faster the production speed, with the same product quality.

In general, the invention relates to a spreading apparatus 1 and a method for producing at least part of a spread mat 80 at least partly by air spreading, the spreading apparatus 1 having at least one first spreading head 2 for spreading a material flow 11 consisting of at least a fine fraction 111 and/or a coarse fraction 112, which is fed quantitatively thereto, onto a forming belt 70; wherein the spreading head 2 comprises a wind spreading chamber 20 with an at least partially gas-permeable wall 31 for introducing a gas flow 32, wherein behind the wall 31 in the gas flow 32 (in the gas flow direction) at least one

screen

21, 22, 23 is arranged for separating at least the coarse fraction 112 of the material flow 11 from the fine fraction 111, and below at least one distribution device 40 for the material flow 11 is arranged, which has an extension starting in the wind spreading chamber 20 and extending beyond the wall 31, which extension comprises a first section 401 for distributing at least a part of the fine fraction 111 and a second section 402 for distributing the coarse fraction 112.

By means of the invention, at least a part of the double-layered scattering mat 80 can be produced at least partly by wind scattering, with the aid of only one scattering head 2. In this case, in particular, the material flow 11, which consists of at least the fine fraction 111 and/or the coarse fraction 112, can likewise be distributed homogeneously and sorted into a double-layered scattering mat 80 by means of the one scattering head 2 of the scattering device 1. In contrast to the spreading devices known from the prior art, a time-consuming preliminary separation of the spread material 11, for example by means of a multi-stage sieve, can be avoided in the production of multilayered material plates. Furthermore, the number of spreading heads 2 arranged one behind the other within the spreading device 1 can likewise be minimized by the invention. Advantageously, unlike the prior art, a more compact spreading device 1 for producing multilayered material sheets can thus be envisaged.

List of reference numerals:

1 dispersing apparatus

2 (first) spreading head

3 lateral side

4 (second) dispensing head

10 dosing device

11 material flow

111 fine fraction

112 coarse fraction

113 scrap part

20 wind spreading chamber

21 first sieve

22 second sifter

23 third Screen

30 blower device

31 gas permeable wall

32 air flow

33 guide element

40 distribution device

400 section

401 section of a distribution device

402 segment of a distribution device

41 rolling body bed

42 spreading roller

60 device for waste discharge

70 profiled strip

80 spreading pad

R the direction of rotation of the dispersing roller 42

T Direction of transport of the scatter Mat 80

DS capping layer

And an MS middle layer.

Claims

1. A spreading apparatus (1) for producing at least a part of a spread mat (80) at least partly by air spreading, having at least one first spreading head (2) for spreading a material flow (11) quantitatively fed thereto onto a forming belt (70) arranged below the first spreading head (2);

wherein the first scattering head (2) comprises an air scattering chamber (20) having at least partially gas-permeable walls (31) at the lateral sides (3), which walls are operatively connected with a blower device (30) for introducing a gas flow (32) into the air scattering chamber (20),

wherein the first spreading head (2) has at least one distribution device (40) for distributing the material flow (11) onto the forming belt (70),

the distribution device (40) has an extension starting in the wind distribution chamber (20) and extending beyond the wall (31).

2. A scattering equipment (1) as claimed in claim 1, wherein said distribution device (40) comprises a first section (401) for distributing at least a part of the fine fraction (111) of the material flow (11) onto the forming belt (70) and a second section (402) for distributing the coarse fraction (112) of the material flow (11) onto the forming belt.

3. A scattering equipment (1) as claimed in claim 1, characterized in that at least one screen (21, 22, 23) is arranged in the wind scattering chamber (20) after the wall (31) along the gas flow (32) for at least partly separating the coarse fraction (112) from the fine fraction (111) in the material flow (11).

4. A scattering equipment (1) as claimed in claim 1, characterized in that the distribution device (40) is constituted by a rolling body blanket (41) consisting of scattering rollers (42) which are driven in the opposite rotational direction (R) to the air stream (32) on the air stream side.

5. A scattering arrangement (1) as claimed in claim 4, characterized in that the scattering roller (42) has a surface profile which is caused to distribute the fine fraction (111) and/or the coarse fraction (112) of the material flow (11) uniformly over the forming belt (70).

6. A scattering equipment (1) as claimed in any one of claims 1 to 3, characterized in that the second section (402) has at least partially a smaller distance than the first section (401) extending parallel or obliquely with respect to the forming belt (70).

7. A scattering equipment (1) as claimed in any one of claims 1-3, wherein at least the second section (402) of the distribution device (40) extends at least 50%, 75%, 100% or 125% of the distance of extension of the first section (401).

8. A scattering equipment (1) as claimed in any one of claims 1-3, characterized in that at the end of the distribution means (40) extending beyond the wall (31) there is arranged means (60) for the discharge of waste material (113).

9. A scattering equipment (1) as claimed in any one of claims 1-3, characterized in that a guiding element (33) is arranged before and/or after the wall (31) for generating a substantially laminar air flow (32).

10. A scattering equipment (1) as claimed in any one of claims 1-3, characterized in that at least one second screen (22) or third screen (23) is arranged along the gas flow (32) behind the at least one screen (21), wherein the size of the openings of the respective screen (21, 22, 23) decreases with increasing distance from the wall (31).

11. A scattering equipment (1) as claimed in any one of claims 1 to 3, characterized in that a second scattering head (4) is arranged behind the first scattering head (2), which second scattering head is constructed as a mirror image of the construction of the first scattering head (2).

12. A scattering equipment (1) as claimed in any one of claims 1-3, characterized in that at least the scattering roller has another profile outside the wind scattering chamber (20) or behind the wall (31).

13. A scattering equipment (1) as claimed in any one of claims 1-3, characterized in that at least a part of the distribution means (40) is arranged displaceable for the purpose of adjusting the proportion of the material flow (11) that is scattered by wind screening or by the distribution means.

14. The scattering device of claim 5, wherein said surface profile is a V-shaped surface profile.

15. A scattering equipment as claimed in claim 7, characterized in that said distribution means comprise six, twelve or eighteen scattering rollers (42).

16. A scattering equipment as claimed in claim 1, wherein said distribution means is below said air flow (32).