CN107443536B

CN107443536B - Device and method for producing material boards

Info

Publication number: CN107443536B
Application number: CN201710389114.3A
Authority: CN
Inventors: G·冯哈斯
Original assignee: Dieffenbacher GmbH Maschinen und Anlagenbau
Current assignee: Dieffenbacher GmbH Maschinen und Anlagenbau
Priority date: 2016-05-31
Filing date: 2017-05-27
Publication date: 2022-11-01
Anticipated expiration: 2037-05-27
Also published as: CN107443536A; DE102016110070A1; WO2017207448A1; CN207480834U

Abstract

The invention relates to a device for producing material boards, preferably at least partially oriented material boards, comprising at least one grinding line for processing cellulose-containing material, a drying device, a screening device for dividing the dried material into at least two fractions, and a spreading device with at least one spreading head for at least partially oriented spreading of the fractions on an endless circulating forming belt into a spread mat, and a press for pressing the spread mat into material boards, wherein different first and second grinding lines are arranged for the component-specific preparation of the aforementioned material, and a device for adjusting a predetermined ratio of the amounts of material from the respective grinding lines is arranged upstream of the drying device. The invention also relates to a method for producing a material sheet according to the following method steps. By means of the above apparatus and method, an improved and coatable material sheet consisting of coarse chips can be produced.

Description

Device and method for producing material boards

Technical Field

The invention relates to a device for producing material plates.

The invention further relates to a method for producing a material sheet.

Background

In the production of material boards from a spreadable material, the mixture of particulate or fibrous matter and binder is spread to a mat of spread material on a forming or conveying belt, wherein the mat of spread material 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. Common material boards produced here are generally MDF boards made of medium-density fibers, chip boards made of relatively small chips or OSB boards made of directionally dispersed coarse chips or, better expressed as coarse or large-area chips. The spreading is carried out in one or more layers, as required, wherein multiple layers are generally required in the production of thicker or multilayer panels. However, even in the case of sheet production, in particular when special differentiation requirements should be present between the intermediate layer and the cover layer, different layers may be desirable. Two different possibilities of distribution are distinguished in the distribution station: direct spreading after the dosing bin, in which the spread is guided directly onto the forming belt by means of a guide plate, or indirect spreading via a so-called spreading roller system. In indirect scattering, the scattered material discharged from the dosing bin falls onto so-called scattering rollers, which separate the scattered material and, if necessary, also sort the scattered material. Various spreading arrangements for this application are well described in the patent literature, in which the scatter is either fed onto the scatter roller in the middle or at the end of the scatter roller. In this case, a part of the chips is conveyed further and another part falls through the dispersion roller onto the forming belt until only unsuitable dispersion material remains and has to be removed from the production process. Both principles have proven to be effective in production and have been put into use successfully.

Corresponding publications can be found in: DE 10 2007 049 947 A1, DE 102 06 595 A1 and EP2598298 B1.

Each scattering of a certain fine-component scattering material (here chips or shreds) with scattering material is associated with problems in the production of a high-precision weight distribution per unit area. In particular, the high throughputs of the dispersion and the production of dispersion pockets or other inaccuracies in the weight per unit area in the dispersed dispersion mat during directional dispersion can deteriorate the subsequent quality of the material web.

Different variants of spreading heads for spreading machines are known from the prior art. In chip spreading, for example for chip boards, the spread material is sorted according to size and/or density by means of a separating device, possibly a roller spreading head or an air screen, and laid down successively on a forming belt. In this case, usually a fine dispersion is first laid on a forming belt, and then a coarser dispersion is dispersed on the fine material. A scatter mat comprising a fine covering layer and a second, coarser layer is thus obtained. Depending on the method or the arrangement and embodiment of the spreading machine, coarse layers may also be spread and/or fine layers may also be spread. This results in an intermediate layer of the same relatively coarse dispersion and two cover layers of fine dispersion. In contrast, the devices for producing directionally scattering chip boards (OSB) are usually arranged exactly opposite one another, since here the longer chips are preferably laid down as a covering layer in a longitudinally oriented manner on the forming belt, while the shorter and broken chips are scattered in a transversely oriented manner in the intermediate layer. A corresponding device and method are known from EP2598298B1, in which coarse chips are first separated after their entry in a combined scattering head and are fed to different scattering types after their sorting. In this case, it can be provided that coarse material is fed to the outer layer and finer material is fed to the intermediate/inner layer. The application of which has proven effective in principle, but provides room for improvement.

OSB boards or chipboards produced according to this prior art are popular for their appearance because they produce an arbitrary surface pattern with unevenness, which is used, for example, as a partition or partition for construction sites. These panels are also used as wall enclosures in warehouses or similar buildings because of their strength.

However, the coarse debris plate can also be used for expensive decorative or sandwich panels. In particular, it is also desirable that the coarse chip boards should be coatable so that the boards can be tempered in a known decorative process.

In order to be competitive in international comparisons, the plant operator producing the sheet of material must provide a large number of producible products. In addition to material selection, material mixing and material processing, the necessary variants of the production method and a high degree of flexibility in particular with regard to the layer structure of the dispersion mat from which the material board is subsequently pressed are required.

Disclosure of Invention

Starting from this, the object of the invention is to provide an apparatus which is improved compared to the prior art and is significantly more flexible, and a corresponding production method. It is also intended to provide an improved and in particular coatable material sheet made of coarse chips.

The invention is based on a device for producing an at least partially oriented strand of material for producing a web of material, which comprises at least one grinding line for processing a material containing cellulose, a drying device, a screening device for separating the dried material into at least two fractions, a spreading device with at least one spreading head for at least partially oriented spreading of the fractions on an endless circulating forming belt to form a spread mat, and a press for pressing the spread mat into a web of material.

The solution of this task is that different first and second grinding lines are arranged for the preparation of the aforementioned materials by composition, and that means for adjusting a pre-given ratio of the amount of material from each grinding line is arranged before the drying means.

Preferably, at least one drum chipper and a subsequent cutter head cutting device with a fixed axis of rotation are arranged in the first grinding line.

Preferably, at least one cutter head with a displaceable shaft is arranged in the second grinding line, wherein preferably the cutter head is guided in rotation past a stationary wood or log to produce coarse chips.

Alternatively or additionally, the screening device is adapted to divide the dried material into two portions according to its length and/or its width.

Alternatively or additionally, the magazine for storing the coarse fraction is arranged in operative connection with the spreading head for spreading the middle layer of the spreading mat, and the magazine for storing the fine fraction is arranged in operative connection with the spreading head for the outer layers.

Alternatively, the silo for storing the coarser fraction is arranged in operative connection with the scattering head for scattering the layer of the scattering mat situated on the outside, while the silo for storing the finer fraction is arranged in operative connection with the scattering head for the intermediate layer.

In particular, provision can be made in the installation for the two aforementioned operating modes to be selectively switchable between them in order to be able to produce different layer structures of the scattering mat in the installation.

In particular, it can be provided that a sorting spreading head is arranged for sorted spreading of the first and second fractions.

Alternatively or additionally, it can be provided that the screening device for the dried material is adapted to separate a third fraction, preferably a third fraction having a smaller particle size than the first or second fraction, and that the screening device is preferably operatively connected to a further grinding line, preferably an impact mill.

Alternatively or additionally, it can be provided that the magazine of the third part is operatively connected to a spreading head for producing a covering layer of a spread mat.

Alternatively or additionally, it can be provided that, for separating a fourth, preferably finest fraction from the dried material and/or from the third fraction, a screen is arranged, in particular before and after the grinding line, wherein it is particularly preferred that the silo of the fourth fraction is in operative connection with the heat utilization device.

It is particularly preferred that the control means in the apparatus is arranged in operative connection with means for adjusting the proportion of material fed from the grinding line to the drying means.

The method for producing at least partially oriented material boards according to the invention operates according to the method steps in which the cellulose-containing material is ground in at least one grinding line, dried in a drying device to form a dried material, subsequently divided into at least two parts by means of a screening device, and at least one of the parts is deposited in a spreading device by means of at least one spreading head on an endless circulating forming belt to form a spread mat, and the spread mat is finally pressed in a press to form the material board.

The solution to the task of the method essentially consists in that the materials are prepared differently in the first and second grinding lines by composition, and the materials from the at least two grinding lines are fed to the drying device for drying in a ratio which is predetermined in relation to one another.

It is particularly preferred that the material is pre-ground in the first grinding line by means of at least one drum chipper and is fed to a subsequent cutterhead cutting device for further grinding with a fixed axis of rotation.

It is particularly preferred that, in addition, the material is ground in the second grinding line by means of at least one cutter head with a displaceable shaft, wherein the cutter head is guided in rotation past the stationary wood or log to produce coarse chips.

Alternatively or additionally, the material is pre-sorted according to its properties and fed to each grinding line differently from each other.

Alternatively or additionally, the dried material is divided into two portions according to its length and/or its width.

Alternatively or additionally, the thicker part serves to spread the middle layer of the spreading mat, while the thinner part serves to spread the layer located on the outside.

Alternatively or additionally, the thinner part serves to spread the middle layer of the spreading mat, while the thicker part serves to spread the layer lying on the outside.

Alternatively or additionally, the portions are sorted in at least one scattering head.

Alternatively or additionally, a third fraction with fine material is separated from the dried material, wherein preferably the fraction of the third fraction is adjusted depending on the desired throughput of fine material.

Alternatively or additionally, the third fraction is fed to another grinding line, preferably an impact mill.

Alternatively or additionally, the third section is used to produce a covering layer for the scattering mat, wherein the covering layer usually has a finer material than the first two sections.

Alternatively or additionally, the finest components from the fractions or from the dried material, in particular from the third fraction, are separated as a fourth fraction (preferably dust) before and after the grinding line by means of sieves and fed to the heat utilization device. This is especially true when there is no need for sufficient material in the region of the third section or for producing a pad of scattering material at all.

Preferably, the means for adjusting the mixing ratio of the materials sent from the grinding line to the drying means are controlled by means of control means, preferably according to pre-given parameters or tables, most preferably in the case of containing measurements from various parts of the apparatus, which parts of the apparatus are operatively connected to the control means for transmitting the measurements.

It is not mandatory according to the invention that different grinding processes have to be carried out by means of technically distinct grinding devices. Within the meaning of the present invention it is sufficient when the grinding line with the impeller cutting device with a cutter width of 500 mm grinds the material and the impeller cutting device with an alternative cutter width (for example 750 mm, 1000 mm or 250 mm) in the second grinding line grinds the material. It is decisive in the sense of the invention that two material flows with distinctly different particle size distributions are present after each grinding line, which are subsequently mixed in the plant according to the production requirements before entering the dryer. The change in proportions is particularly necessary when one or more silos no longer have sufficient material or production is to be adjusted.

It is particularly preferred that the plant has a control device, in particular a digitally controlled control device, which controls the material flow in the plant according to the operator's specification and here the mixing ratio from the grinding line according to the production conditions, the amount of material in the silo. In this case, the wear in the grinding line can be controlled relatively, for example, when, for example, the composition of the coarse chips in the first portion becomes smaller due to deteriorated cutting power or only defective material is used for a certain period of time, which material does not provide a sufficient yield for the first portion. In this case, it is particularly preferably provided that the control device receives feedback from the silo, the grinding line, the dryer, the screening device, the spreading device or the shaping line (shaping belt with spreading mat) and the press, and can correspondingly adapt the plant components to changing conditions.

The following table reproduces typical parameters for the finest Fraction (FK), the fine fraction (GK, KS, LS) and/or the coarse fraction (KB, LB) of a scattering material orientable for OSB production, but the exemplary proportions of finest fraction, fine fraction, coarse fraction (5. In particular, the transition from FK to GK is smooth and depends on the screening device adjusted or used.

Drawings

Next, other advantages of the present invention will be described according to the embodiments and with reference to the accompanying drawings.

Shown schematically in the drawings:

figure 1 shows an apparatus for producing a material sheet from storage of raw material up to a press according to a first embodiment,

figure 2 shows an exemplary spreading device according to figure 1 in larger dimensions,

figure 3 shows an exemplary material flow from the comminution line up to the manufacture of the scattering mat,

figure 4 shows a first embodiment of a multilayered material sheet or scattering mat,

fig. 5 shows a second embodiment of a multilayered material sheet; and

fig. 6 shows a third embodiment of a multilayered material sheet with a covering layer consisting of fine components.

In the following description of the preferred embodiments of the invention, like reference numerals designate identical or comparable parts.

Detailed Description

Fig. 1 schematically shows the production process and the material flow from the storage position of the material M up to the spread mat 4 pressed in the press 5 and the material sheet 6 cut to length. It is pointed out here that the proposed procedure is shortened and not shown in all details that would otherwise be necessary. However, the present invention is explained fully and easily from the schematic drawings.

The material M, after being taken out of the storage location, is fed to a preparation device, which basically comprises a crushing device and, if possible, a cleaning device. The material is in some cases pre-sorted here or already stored in correspondence with the use for the grinding line Z1 or Z2. In this exemplary embodiment, the material M is pre-ground in the first grinding line Z1 by means of a drum milling device 8 and subsequently ground in an impeller cutting device 9 with a predetermined particle size distribution. In this grinding line Z1, the cutter head 10 has a fixed axis 13 about which the cutter head 10 and/or the corresponding counter-knife rotate.

In the second grinding line 7, a so-called longwood chipper (english: longlog-Flaker) is arranged. The main differences from the aforementioned cutter head cutting device 9 are: the shaft 12 of the cutterhead 11 is displaceable relative to the material M being clamped and to be cut. A particular advantage is that, by means of the strand flaker, long and wide coarse chips can be produced, which are suitable for the high-quality production of coarse-chip boards (OSB).

After the grinding lines Z1, the material M to be ground is fed to a device 25 for adjusting a pre-given ratio between the amounts of material coming from the two grinding lines Z1, Z2, and from this device 25 the material is fed in a corresponding ratio to the dryer 14 of the drying device T. The device 25 can for example also consist of two conveyors whose transport capacity is divided and/or adjustable, which connect the grinding lines Z1, Z2 to the dryer 14. Alternatively, it may also be expedient to provide one or more silos (not shown, but belonging to the grinding lines) between the grinding lines Z1, Z2 and the drying device T, from which silos the material can be taken out in a predetermined ratio.

After the drying device T, the dried material Mt arrives in a screening device S, which is adapted to separate the dried material Mt into various fractions. Illustratively, the material is preferably divided into four portions F1, F2, F3 and F4 in this embodiment. The four fractions are now sent to the silo 21 for fraction F1, the silo 22 for fraction F2, the silo 23 for fraction F3 and, if possible, a fourth fraction into the silo 24 depending on the equipment of the screening device S. These

silos

21, 22, 23, 24 can be embodied as so-called dosing silos and have corresponding dosing devices (not shown) for the metered discharge.

The portion F1 is preferably a coarse material, the portion F3 is preferably a fine material, and the portion F2 is a material having a particle size distribution disposed between the portions F1 and F3 corresponding to this embodiment.

In the preferred embodiment, the portions F1 and F2 are orientable materials suitable for spreading in a transverse and/or longitudinal orientation, in order to produce a coarse scrap/material sheet 6 with an oriented layer and an external fine layer.

In the production of a three-layer coarse chip board, for the production of such a chip board, the parts F1 and F2 are sufficient, wherein the parts F1 and F2 are fed in accordance with the provisions of the spreading device 1, so that a spreading mat 4 with at least one directionally spreading layer can be produced on the forming belt 3. Here, in the method schematic, three intermediate scattering heads 2 for each section are used. The scatter mat 4 thus produced can then be pressed in a press 5 into a material sheet 6. For a possible layer structure of the scattering material mat, a detailed description is given with reference to the drawing of fig. 2.

If sufficient suitable material for fraction F3 (silo 23) has been obtained from the screening device S, this material is directly used for producing the fine cover layer along the dashed arrow. However, as a rule, the fraction F3 is also subjected to a regrinding, here the grinding line Z3, and is reground by means of the impact mill 18. In this case, the fraction F3 is fed directly after the grinding line Z3 to the silo 23 or is further sieved in the sieve 19 and the other fraction F4 is separated. The fraction F4 is preferably dust or other fines which are preferably suitable for the heat utilization device V by means of a dust burner or a particle burner and are stored for this purpose in the silo 24. Furthermore, fines may already be separated in the screening device S after the dryer 14, when this is needed or desired.

According to the invention, the ratio between the grinding lines Z1 and Z2 can be adjusted according to the production requirements or preferably distributed by means of a distribution device 20. The spreading device 20 is preferably operatively connected to material level sensors (not shown) of the

bins

21, 22, 23, 24 and supplies the material M to the grinding lines Z1 and Z2 as required and subdivides the ground material in the device 25 according to the desired percentage%. Corresponding connection arrows indicate effective connection with the various device components and are not an exact listing. It is particularly preferred that the distribution device 20 can utilize a table or recipe for producing the material sheet in a digitized form and that the production parameters of the apparatus can be controlled in accordance with the table.

The scattering device 1 is shown in fig. 2 in an enlarged scale. Five spreader heads 2 may be used to make a five-layer spreader pad 4 in a continuous application. Alternatively, different layer structures can also be realized with the various dispensing heads 2 closed.

In the scattering head, from left to right, a roller scattering device, a longitudinal orientation device, a transverse orientation device, a longitudinal orientation device and again a roller scattering device are arranged by way of example.

If, for example, no odd number of spreading heads 2 are operated, only one layer of longitudinally oriented spreading mat 4 is made, preferably made of portions F1 and/or F2. The spreading mat can be provided with a covering layer 17, preferably made of the material of the portion F3, during operation of the two outer spreading heads 2.

In an alternative application, all three directional spreading heads 2 (second, third and fourth spreading heads) can be used and a three-layer directional spreading mat can be formed with a middle layer 15 of transversely oriented material and with two outer layers 16 of longitudinally oriented material. Depending on the difference in the feed of the fractions F1 or F2 to the scattering head 2, a classic coarse chip plate (OSB) is now produced, which has a fraction F1 with coarser coarse chips on the outside and a fraction F2 with smaller coarse chips on the inside. Alternatively, when the parts are switched, a coatable coarse chip plate can be produced in which a coarse portion F1 is arranged in the intermediate layer 15 and a finer portion F2 is arranged in the outer layer 16.

If all the spreading heads 2 are now supplied with material portions F1, F2 and F3 corresponding to the illustration, a so-called fine OSB panel is produced, which is also arranged with the finest material portion F3 as a cover layer 17 above the externally located alignment layer 16. The material sheet 6 thus produced has a coatable surface.

In a very particularly preferred embodiment, at least some of the portions F1, F2, F3 are distributed in a sorted manner in the distribution head 2 by suitable means.

Fig. 3 shows an alternative apparatus and method for producing a material sheet 6. After the screening device S, the fractions F1 to F3 are formed in such a way that the coarse fraction with wide coarse chips in the fraction F1 and the fine fraction with narrow coarse chips in the fraction F2 are separated. The finest fraction FK, which here belongs to fraction F3 as fines, is ground in an impact mill 18 and subsequently used in a spreading head for producing the coating. Preferably, the cover layer is distributed in a classified manner such that the fine component FK (an imaginary center line with respect to the structure of the spreading mat) is arranged outward and the coarse grain GK is arranged in the direction of the intermediate layer corresponding to the particle size distribution of one portion. Subsequently, the narrow portions F2 are likewise distributed in a sorted manner on the first cover layer, wherein the short, narrow coarse chips KS are first laid and then the long coarse chips LS are laid. For the intermediate layer, the wide coarse chips of the coarse composition from the portion F1 are preferably laid such that the short, wide coarse chips KB are laid on the outside and the long, wide coarse chips LG on the inside. The long and wide chips LB thus form a part of the intermediate layer which corresponds to the imaginary centre line of the scattering mat 4. Correspondingly, the fourth and fifth spreading heads 2 are used in mirror image to ensure a uniform layer structure.

Fig. 4 shows a three-layer material sheet 6 consisting of a pressed three-layer scattering mat/material sheet with two longitudinally oriented and sorted (short to long) outer layers consisting mainly of narrow coarse chips KS, LS and a transversely oriented middle layer (also sorted from short to long) consisting mainly of wide saw-broken strips KB, LB.

Fig. 5 shows a three-layer material plate/scattering mat constructed as an OSB with two outer layers of predominantly wide coarse chips KB, LB, oriented longitudinally and sorted on the outside, and a middle layer of predominantly narrow coarse chips KS, LS, oriented transversely. Here, again, the sorted arrangement in the individual layers is shown.

Fig. 6 finally shows a five-layer material sheet/dispersion mat, which is designed as fine surface-conditioned OSB and has an outer, non-oriented two-layer coating of fine chips FK and chips GK, which are preferably arranged in a sorted manner. Below the cover layer, two longitudinally oriented and sorted layers, which are composed mainly of narrow coarse chips KS, LS, and a transversely oriented intermediate layer, which is composed mainly of wide saw-chip strips KB, LB, are arranged.

In this case, it is also applicable in the sorted regions that narrow coarse chips are sorted according to short coarse chips KS and long coarse chips LS, or that wide coarse chips are sorted according to short coarse chips KB and long coarse chips LK.

List of reference numerals

1. Distribution device

2. Cloth spreading head

3. Molding belt

4. Spreading material pad

5. Press machine

6. Material sheet

7. Cutter head cutting device

8. Drum type chipping device

9. Cutter head cutting device

10 (9) cutter head

11 (7) cutter head

12 (7) displaceable shaft

13 (fixed) shafts

14. Drying machine

15 (4) intermediate layer

16 Layer (4)

17 (4) coating layer

18. Impact mill

19. Sieve

20. Dispensing device

21. Stock bin (F1)

22. Stock bin (F2)

23. Stock bin (F3)

24. Stock bin (F4)

25. Device for measuring the position of a moving object

% ratio

M material

Mt (dry) material

P production Direction

S screening device

T drying device

V (Heat) utilization device

Z1 crushing line

Z2 crushing line

Z3 crushing line

F1 In part

F2 In part

F3 In part

F4 Part (finest part).

Claims

1. An apparatus for producing a material board, the apparatus comprising different, at least a first grinding line (Z1) and a second grinding line (Z2) for processing a cellulose-containing material (M),

a drying device (T) for drying the fabric,

a screening device (S) for dividing the dried material (Mt) into at least two fractions, a first fraction (F1) and a second fraction (F2), and

a spreading device (1) with at least one spreading head (2) for at least partially directionally spreading the parts on an endless circulating forming belt (3) into a spread mat (4), and

-a press (5) for pressing the spread mat (4) into a material sheet (6), characterized in that,

an adjusting device (25) for adjusting a pre-given proportion (%) of the amount of material from each grinding line (Z1, Z2) is arranged before the drying device (T), wherein,

a control device (20) is arranged in operative connection with said adjusting device (25) for adjusting the ratio (%), said control device (20) being adapted to adjust said pre-given ratio (%) of the amount of material from each grinding line (Z1, Z2) in the presence of measured values from each part of the apparatus, wherein each part of the apparatus is in operative connection with said control device (20) for transferring said measured values.

2. The apparatus of claim 1, wherein the apparatus is configured to produce a sheet of material from at least partially directionally dispersed material.

3. A device according to claim 1, characterized in that the control means (20) are operatively connected to at least one of the following parts of the device for the purpose of obtaining feedback: a silo, the grinding line, a dryer, a screening device, a spreading device or a shaping line and press.

4. An apparatus according to any one of claims 1 to 3, characterized in that at least one drum chipper (8) and a subsequent first cutter disc cutting device (9) with a fixed axis of rotation are arranged in the first grinding line (Z1).

5. The apparatus according to any of the claims 1 to 3, characterized in that at least one second impeller cutting means (7) with a displaceable shaft (12) is arranged in the second grinding line (Z2).

6. The apparatus as claimed in claim 5, characterized in that the cutterhead (11) is guided rotationally past stationary timber or logs to produce coarse chips.

7. An apparatus according to any one of claims 1 to 3, characterized in that the screening device (S) is adapted to divide the dried material (Mt) into a first portion (F1) and a second portion (F2) according to its length and/or its width.

8. The apparatus according to claim 1, characterized in that a first silo (21) for storing the coarser fraction (F1) is arranged in operative connection with the spreading head (2) for spreading the intermediate layer (15) of the spreading pad (4), while a second silo (22) for storing the finer second fraction (F2) is arranged in operative connection with the spreading head (2) for the layer (16) lying outside.

9. The apparatus according to claim 1, characterized in that a first magazine (21) for storing a first, relatively coarse fraction (F1) is arranged in operative connection with the spreading head (2) for spreading the outer layer (16) of the spread pad (4), and a second magazine (22) for storing a second, relatively fine fraction (F2) is arranged in operative connection with the spreading head (2) for the intermediate layer (15).

10. The apparatus according to claim 8 or 9, characterized in that a sorting scattering head (2) is arranged for sorting scattering of the first fraction (F1) and/or the second fraction (F2).

11. An apparatus according to any one of claims 1 to 3, characterized in that the screening means (S) for the dried material (Mt) are adapted to separate a third fraction (F3) having a smaller particle size than the first fraction (F1) or the second fraction (F2).

12. The apparatus according to claim 11, characterized in that said screening means are operatively connected to a third grinding line (Z3).

13. The apparatus according to claim 12, characterized in that said third grinding line (Z3) is an impact mill (18).

14. The apparatus according to claim 11, characterized in that the third silo (23) of the third portion (F3) is operatively connected to a scattering head (2) for producing the covering layer (17) of the scattered pad (4).

15. An apparatus according to claim 11, characterized in that for separating a fourth fraction (F4), which is the finest component, from the dried material (Mt) and/or from the third fraction (F3), a screen is arranged.

16. An apparatus according to claim 15, characterized in that the screens are arranged before and after the third grinding line (Z3).

17. The plant according to claim 15, characterized in that the fourth silo (24) of the fourth portion (F4) is operatively connected to a heat utilization device (V).

18. A method for producing material boards, according to which method steps are carried out in which a cellulose-containing material (M) is ground differently in at least a first grinding line (Z1) and a second grinding line (Z2),

dried in a drying device (T) to a dried material (Mt),

subsequently divided into at least two parts, a first part (F1) and a second part (F2), by means of a screening device (S), and

at least one of the parts is laid in a spreading device (1) by means of at least one spreading head (2) on an endless circulating forming belt (3) to form a spread mat (4), and

the dispersion mat (4) is finally pressed in a press (5) to form a material sheet (6), characterized in that,

the material from these grinding lines (Z1, Z2) is fed in a predetermined ratio (%) relative to each other to the drying device (T) for drying, and

-controlling, by means of a control device (20), an adjusting device (25) for adjusting the mixing ratio of the amounts of material from the grinding lines (Z1, Z2) to be fed to the drying device (T) in the presence of measured values from parts of the apparatus which are operatively connected to the control device (20) for the purpose of delivering the measured values.

19. A method according to claim 18, wherein the method is used for producing a sheet of material from at least partially directionally dispersed material.

20. Method according to claim 18, characterized in that the control device (20) is operatively connected to at least one of the following parts of the apparatus for obtaining feedback: a silo, the grinding line, a dryer, the screening device, a spreading device or a shaping line and press.

21. The method as claimed in any one of claims 18 to 20, characterized in that the first grinding line (Z1) is formed from at least one drum chipper (8) and a subsequent first cutter disc cutting device (9) with a fixed axis of rotation, as seen in transport technology.

22. The method as claimed in any of claims 18 to 20, characterized in that the second grinding line (Z2) is formed from, from a transport technology point of view, at least one second cutterhead cutting device (7) with a displaceable shaft (12), wherein the cutterhead (11) is guided in rotation through stationary timber or logs to produce coarse chips.

23. The method according to any one of claims 18 to 20, characterized in that the material (M) is pre-sorted according to its characteristics and fed to each grinding line (Z1, Z2) differently from each other.

24. The method according to any one of claims 18 to 20, characterized in that the dried material (Mt) is divided into a first portion (F1) and a second portion (F2) according to its length and/or its width.

25. A method as claimed in claim 18, characterised in that a first, coarser fraction (F1) is used for spreading the intermediate layer (15) of the spread pad (4) and a second, finer fraction (F2) is used for spreading the layer (16) located on the outside.

26. A method as claimed in claim 18, characterised in that the thinner second portion (F2) is used for spreading the intermediate layer (15) of the spreading mat (4) and the thicker first portion (F1) is used for spreading the layer (16) located on the outside.

27. The method according to claim 25 or 26, characterized in that the first portion (F1) and/or the second portion (F2) are sorted for distribution within at least one distribution head (2).

28. A method as claimed in any one of claims 18 to 20, characterized by separating the third fraction (F3) with fine material from the dried material (Mt).

29. The method of claim 28, wherein the fraction of the third portion is adjusted based on a desired throughput of fine material.

30. The method according to claim 28, characterized in that the third fraction is fed to a third grinding line (Z3).

31. The method according to claim 30, characterized in that the third grinding line (Z3) is an impact mill (18).

32. The method according to claim 28, characterized in that said third portion (F3) is used for producing a covering layer (17) of said scattering mat (4).

33. A method as claimed in claim 30, characterised in that the finest components from the first fraction (F1) and the second fraction (F2) or from the dried material (Mt) are separated as a fourth fraction (F4) before and after the third grinding line (Z3) by means of screens (19) and fed to a heat utilization device (V).

34. The method according to claim 33, characterized in that the finest component from the third fraction (F3) is taken as the fourth fraction (F4).

35. The method of claim 34, wherein the fourth portion is dust.

36. Method according to any of claims 18 to 20, characterized in that the adjusting device (25) is controlled by the control device (20) according to pre-given parameters or tables.