WO2023046990A2

WO2023046990A2 - Plant and method for manufacturing material boards

Info

Publication number: WO2023046990A2
Application number: PCT/EP2022/076841
Authority: WO
Inventors: Jan Kasten; Felix Hofmann; Jochen KAMM
Original assignee: Dieffenbacher GmbH Maschinen- und Anlagenbau
Priority date: 2021-09-27
Filing date: 2022-09-27
Publication date: 2023-03-30
Also published as: WO2023046990A3; DE102021004876A1

Abstract

The invention relates to a method and to a plant for manufacturing material boards, said plant comprising: a storage facility (2) for waste wood as a feedstock (1); optionally a comminuting device (3) for the feedstock (1) to create an input material (4) for the plant; a classifying device (5) for dividing the feedstock (1) and/or the input material (4) into differentiated fractions; a purification device (10) for separating foreign material (13) from at least one of the fractions; a processing unit (20, 21) for producing and transferring scatterable particles in a scattering device (22, 23); a forming conveyor (24) for receiving the scattered particles; and a pressing machine (25) for pressing the scattered particles to produce a material board (27), wherein a sorting device (12) for dividing the purified fraction into solid wood (18) and wood materials (16) is connected downstream of the at least one purification device (10) in the plant, and the sorting device (12) is operatively connected directly or indirectly to the processing unit (20, 21) in order to transfer the purified fraction (1630).

Description

PLANT AND PROCESS FOR THE MANUFACTURE OF MATERIAL PANELS

The invention relates to a plant for the production of material panels according to the preamble of patent claim 1 . The invention further relates to a method for producing material panels according to patent claim 11 .

The production of material panels from crushed vegetable particles has been known for decades. Here, as a rule, woody plants such as trees and shrubs, but also annual plants, are comminuted into fibers or particles, dried, glued and pressed in a press to form a material panel. In the course of climate change, however, these raw materials are also used as climate-neutral fuels, so that it is desirable to significantly increase the proportion of recycling in the production of material boards or, if possible, to do without fresh wood.

Waste wood, which is classified into different waste classes, is usually collected centrally, but in particular pre-sorted by non-professionals. As a rule, these are instructed to the extent that they can roughly differentiate between the waste classes; further sorting is not planned. In a large number of countries with a recycling structure that has not yet developed, such pre-sorting does not even take place. As a rule, impregnated or tarred wood is disposed of directly because it can usually be easily recognized by a layperson, and all other wood (solid wood mixed with wood-based materials) is sent for recycling in containers. For recycling, the collected and non-uniform starting material is subjected to an initial crushing, as is usual in recycling. Foreign matter is then removed from the shredded starting material until reusable waste wood can be recycled with the highest possible degree of purity.

The invention distinguishes between two different types within the waste wood:

- once the natural wood, which was machined into a suitable form ready for use, possibly coated or painted (window frames, beams, timber, solid wood furniture) and

- on the other hand "man-made materials" which are based on crushed and glued natural wood. This was glued during production and pressed into specified shapes (usually boards) and the binder cured accordingly, for example MDF, HDF, chipboard, OSB, LVL and the like.

The main difference between these two types is that after crushing, the natural wood (solid wood) can provide good quality and larger chips/shavings of wood, whereas the already artificially produced wood materials, already consisting of relatively small chipped wood particles, only produce smaller ones , Partially containing binder particles can be obtained.

Waste wood suppliers can indeed comply with certain specifications, but purely usable waste wood of the natural variety is usually not offered or is very expensive. The system and the process are therefore preferably used for an A1/A2 mixed fraction.

The present invention now has the task of creating a system and a method in which collected and reusable waste wood can be processed and recycled in the course of the manufacture of material panels.

In an extension of the task, it should be possible, based on the need to clean and sort the waste wood delivered, to be able to use the existing resources in such a way that either OSB boards, MDF, and/or chipboard of high or lower quality can be used with the existing material are producible.

The solution to the task for a plant for the production of material panels includes a store for delivered waste wood as starting material, optionally a shredding device for the starting material into input material for the plant, a classifying device for dividing the starting material and/or the input material into differentiated fractions and a Cleaning device for separating foreign material from at least one of the fractions, processing for producing and transferring scatterable particles in a scattering device, a forming belt for receiving the scattered particles and a press for pressing the scattered particles into a material panel, with the at least one cleaning device having a sorting device downstream for dividing the cleaned fraction into solid wood and wood-based materials and the sorting device is directly or indirectly operatively connected to the processing for transferring the cleaned fraction.

Another store for receiving delivered wood chips from the recycling circuit can be operatively connected to the cleaning device and/or the sorting device. Alternatively or cumulatively, means for creating at least three fractions, preferably fines, oversizes and a usable fraction, can be arranged in the classification device. Further means for dividing the usable fraction into a micro-fraction and a macro-fraction are particularly preferably arranged in the classifying device.

Alternatively or cumulatively, an X-ray device for detecting and ejecting foreign matter and/or an NIR device or a camera system for distinguishing between solid wood and wood-based material in the sorting device as well as correspondingly controllable separating means or separating means can be arranged in the cleaning device.

Alternatively or cumulatively, in the case of an indirect connection between the sorting device and processing, at least one storage bunker can be arranged for the various classified and/or cleaned material flows.

Alternatively or cumulatively, to support the necessary throughput of the starting material from waste wood, a store for starting material from fresh wood, a shredding device, an optional classifying device, an optional storage bunker can be arranged in operative connection with the processing.

Alternatively or cumulatively, means for comminuting the starting material to a size of less than 100 mm, preferably less than 90 mm, particularly preferably less than 80 mm and very particularly preferably less than 70 mm can be arranged in the comminution device. A drum chipper or a shredder would be advantageous as a shredding device.

Alternatively or cumulatively in the classifier - Means for separating oversizes 9 with a size of greater than 100 mm, preferably greater than 90 mm, particularly preferably greater than 80 mm and very particularly preferably greater than 70 mm and/or

- Means for separating fines with a size of less than 5 mm, preferably less than 3 mm, particularly preferably less than 2 mm and very particularly preferably less than 1 mm and / or

- Means for separating a macro-fraction with a size of greater than 10 mm, preferably greater than 12 mm, particularly preferably greater than 15 mm and very particularly preferably from coarse wood chips up to a size of oversize and / or

Means for separating a micro-fraction with a size of greater than 1 mm, preferably greater than 3 mm, particularly preferably greater than 5 mm and up to a size of the macro-fraction.

Alternatively or cumulatively, a control device or regulating device for controlling the material flows can be arranged, which is operatively connected at least to the storage bunkers of the solid wood, the wood-based materials, the microfraction and/or the macrofraction and is preferably suitable for gravimetric or volumetric volume control of the material flows.

Alternatively or cumulatively, the storage bins can be arranged so that they can be connected to various processing or mixing devices in order to adjust the ratios of the material flows and/or to adjust the material panel to be produced.

The task is for a method for the production of material panels in a

System solved with the following process steps:

- storage of waste wood as starting material, - comminution of the starting material to an input material, preferably to a predetermined grain size distribution, by means of a comminution device,

- Classify the input material into differentiated fractions, clean at least one of these fractions using a cleaning device, prepare this fraction in a treatment to scatterable particles in a scattering device,

- Scattering the particles on a forming belt and

- Pressing the particles into a material plate in a press,

After the fraction has been cleaned in a cleaning device, a sorting device can preferably sort the cleaned fraction into solid wood and wood-based materials and, depending on the requirements, can be handed over to processing

Alternatively or cumulatively, delivered, preferably already cleaned waste wood can also be stored in the form of wood chips and fed to the cleaning device and/or the sorting device.

Alternatively or cumulatively, at least three fractions, fines, oversizes and a usable fraction for the cleaning device can be provided in the classification device and the usable fraction is particularly preferably classified into at least one micro-fraction and one macro-fraction.

Alternatively or cumulatively, an X-ray device can be used in the cleaning device to detect and eject foreign matter and/or an NIR device or a camera system can be used in the sorting device to differentiate between solid wood and wood-based material, as well as correspondingly controllable separating means. Alternatively or cumulatively, the various classified and/or cleaned fractions can be stored after the cleaning device and/or the sorting device in at least one storage bunker.

Alternatively or cumulatively, to support the necessary throughput in the production of panels, fresh wood can be stored in a separate store as the starting material, crushed in a shredding device and classified in an optional classifying device and, if necessary, stored in a storage bunker before processing.

Alternatively or cumulatively, the starting material can be comminuted in the comminution device to a size of less than 100 mm, preferably less than 90 mm, particularly preferably less than 80 mm and very particularly preferably less than 70 mm. A drum chopper or a shredder can preferably be used as the comminution device.

Alternatively or cumulatively, it is provided that in the classification device

- Means for separating oversizes with a size of greater than 100 mm, preferably greater than 90 mm, particularly preferably greater than 80 mm and very particularly preferably greater than 70 mm and/or

- Means for separating a micro fraction with a size of greater than 1 mm, preferably greater than 3 mm, particularly preferably greater than 5 mm and up to a size of the macro fraction are used. Alternatively or cumulatively, a control device or a regulating device can distribute the individual material flows in the plant and in the course of this control at least the storage bins for the solid wood, the wood-based materials, the micro-fraction and/or the macro-fraction as well as their discharge devices and preferably the control based on gravimetric or volumetric measurement results of the material flows.

Alternatively or cumulatively, the storage bunkers in the plant can be connected to various processing or mixing devices to adjust the ratios of the material flows and/or to adjust the material panel to be produced.

The advantage of the invention is that after a first pre-crushing and a cleaning process, roughly two different types of materials are present, namely solid wood and “manufactured” wood-based materials with binders. After pre-shredding, these usually differ in their length/width ratio, since the solid wood is longer than wide from pre-shredding, while artificial wood materials (crushed material with binding agent) are more square, i.e. more the same in length and width.

This goes hand in hand with the realization that it is possible to sort out solid wood from mixed waste wood (solid wood and manufactured wood materials) after appropriate cleaning in order to obtain high-quality material for the production of material panels. In particular, it should be possible with the method and the device to process waste wood in such a way that a portion of it can be used as an equivalent substitute for OSB, MDF or chipboard production. In an extension of the task, the proportion of cleaned and sorted solid wood from the waste wood can be fed to production or the fresh wood material flow as required, preferably depending on the quality and quantity of the fresh wood delivery. It is preferably fed either to the flaker for the production of chips for the middle layer or to a knife ring flaker for the production of top layer material.

Advantageously, the invention enables waste wood to be processed and used, among other things, in the production of material panels (including MDF, chipboard, chipboard - OSB). For this purpose, the material, preferably prepared and particularly preferably in predetermined mixing ratios with other materials or fresh wood, can be scattered and pressed to form a material panel. In addition to a single-layer material board, such as MDF, multi-layer material boards, such as chipboard, can also be produced. Steam presses, cycle presses or a continuous press are suitable as presses.

As already explained above, when carrying out waste wood recycling, there is a more or less high proportion of (high-quality) solid wood. It is therefore primarily proposed to separate the solid wood from the old wood before or after the comminution and then to comminute the old wood. In order to reliably meet the highest demands, foreign substances such as metals, non-metals, plastics, sand and stones are first separated from the wood. Careful sorting ensures that only uncontaminated old wood is recycled. The invention has found, among other things, that after a first pre-crushing and a cleaning process, there are roughly two different types of materials, namely solid wood and “manufactured” wood-based materials with binders. After pre-shredding, these usually differ in their length/width ratio, since the Solid wood longer than wide results from pre-crushing, while artificial wood materials (crushed material with binding agent) are more square, i.e. they are more or less the same in length and width. This goes hand in hand with the realization that it is possible to sort out solid wood from mixed waste wood (solid wood and manufactured wood materials) after appropriate cleaning in order to obtain high-quality material for the production of material panels. In particular, it should be possible with the method and the device to process waste wood in such a way that a portion of it can be used as an equivalent substitute for MDF, OSB or chipboard production. With MDF, the material will probably need to be further defibrated.

In an extension, the proportion of cleaned from sorted solid wood from the old wood, depending on the quality and quantity of the fresh wood delivery, can be fed either to the chipper for the production of chips for the middle layer or to a knife ring chipper for the production of top layer material.

The invention makes it possible to obtain large-volume (chip) chips from recycled solid wood or glued laminated wood when recycling waste wood, which chips can be regarded as equivalent to fresh wood (logs).

In terms of process technology, a solution for the individual areas in a particular exemplary embodiment can appear as follows. The individual areas are independently divided into areas A, B, C and D and can be combined as desired:

A) Material entry a1 ) Mixed starting material (waste wood with solid wood parts) is crushed to a size that is as uniform as possible of 60, 70, 80, 90 or 100mm and smaller available. => as input material (a1) for processing b) a2) fresh wood is crushed and supplied to the needs-based production of particles c).

B) Processing (chip cleaning) b) Based on the findings, the input material (a1) is now subjected to screening and preferably divided into four fractions b1) fines for thermal utilization (b11) and/or for top layers of material boards after optional cleaning (b12) (less than 5, preferably less than 3 mm, in particular less than 1 mm). Alternatively, after appropriate classification, this group can be used as fillers in other areas, for example in WPC (Wood Plastic Compounds). b2) Microfraction

(greater than 1, 3, 5 mm down to less than 10 mm, 12, 15 mm) b3) macro fraction

(10, 12, 15 mm or larger, coarse wood chips) b4) Oversized back to shredding (to a1)

C) cleaning

In a cleaning process, the microfraction (b2) and the macrofraction (b3) are cleaned, preferably with a non-contact X-ray sorting device, unusable materials (preferably all non-wood) are sorted out. What remains in the cleaned micro-fraction (c2) is directly usable material of small size and in the cleaned macro-fraction (c3) usable material of larger size. D) sorting:

It is precisely this larger usable material that is suitable for further sorting, since it is either solid wood or artificial wood-based materials. This stream of larger usable material is thus subjected to a sorting that distinguishes between these two types

In summary, the waste wood should be sorted into solid wood and artificial wood after an initial cleaning of foreign matter (metals, non-metals, plastics).

The separated solid wood, provided it is in chip size, can be used in the production of high-quality panels due to its properties being the same as wood chips from fresh wood. It should be noted that the proportions are variable. Buffer options should be provided so that the ratios between solid wood (from recycling), wood materials (from recycling) and fresh wood remain approximately the same for the production of a batch of material boards in order to avoid quality differences in a batch. For this purpose, the system must be designed accordingly and appropriate regulation or control devices must also be created.

Alternatively, the solid wood can also be processed for use in top layers of material panels.

Alternatively, the solid wood can be incorporated into the middle layer to produce an MDF board if this is produced as a three-layer board.

In principle, it is preferred to add the recycled solid wood, comparable to fresh wood quality, to a normal proportion of fresh wood. The system is suitable for carrying out the process, but can also be operated independently.

In the single FIGURE, the process sequence and a corresponding system are explained schematically using a schematic system structure according to a possible exemplary embodiment.

Waste wood is collected as starting material 1 and fed to at least one warehouse 2 . Starting material 1 is fed from storage 2 to a comminution, which preferably comminutes starting material 1 to a maximum size of 100 mm, preferably 80 mm, and subjects it to further processing as input material 4 . For this purpose, the input material 4 is fed to a classification device 5, which preferably divides the input material 4 into four classifications. The smallest fraction as fines 6 is fed to thermal utilization in an energy plant 28 . Before that, however, the fines can be classified again in order to obtain cover layer material 29 for material panels from the fines 6 .

Alternatively, the fines can be used proportionately in other technical areas as fillers, for example in WPC (Wood Plastic Compounds).

The classifying device 5 for the starting material 1, waste wood, generally also gives back a fraction of oversizes 9. The oversizes 9 have not been optimally comminuted and are fed back to the comminuting device 3 for further comminution. The useful fraction lying within these two extreme fractions is divided here according to the preferred embodiment into a micro fraction 7 and a macro fraction 8 . The micro-fraction 7 preferably has particle sizes larger than 1, 3, 5 mm down to smaller than 10 mm, 12, 15 mm, whereas in the macro-fraction 8 preferably particle sizes of larger than 10, 12, 15 mm up to coarse wood chips can be found. The upper limit results from the extracted oversizes 9.

The preferred division into two different usable fractions has the advantage that these two fractions can be fed to cleaning devices 10 that are specially calibrated and adjusted for these sizes. An X-ray measurement is preferably carried out in the cleaning device, on the basis of which foreign material 13 (non-metals, metals, . . . ) is recognized and separated from the material flow. This results in two material flows, on the one hand a cleaned micro-fraction 14 and a cleaned macro-fraction 11 .

The cleaned macro-fraction 11 is preferably subjected to sorting in a sorting device 12, in which solid wood 18 and wood-based materials 16 (glue/binder present) are separated from the macro-fraction 11, for example detected on the basis of NIR spectrography, an equivalent function or using camera systems. This material flow advantageously results in a particularly effective and high sorting quality. Large solid wood particles in this fraction are also suitable for subsequent processing like conventional fresh wood.

The microfraction 14 can also be subjected to an equivalent sorting (not shown). As shown, the cleaned micro-fraction 14 can be stored in a storage bunker 15, the solid wood 18 in a storage bunker 19 and the wood-based materials 16 in a storage bunker 17 until they can be used appropriately.

In the exemplary embodiment, the material flows of solid wood 18, wood-based material 16 and microfraction 14 are now conducted in a plant for the production of material panels or are part of it and are made up again Material plates 27 produced. To this end, the material streams are fed to a preparation stage or, as shown, to two different preparation stages 20 and 21 . In the preparations 20, 21, the various materials are crushed to their required size according to the intended use, optionally dried and glued. According to the exemplary embodiment, preparation 21 is suitable for producing spreadable material for the middle layer of a material board, preferably an OSB, from solid wood material 18 and feeding it to a spreading device 23 .

Nevertheless, the solid wood 18 can also be used for MDF production, the production of chipboard or lightweight panels with fillers. The preparation 20 would accordingly be suitable for drying the cleaned microfraction 14 and/or the sorted wooden materials 16, applying glue and feeding them to a scattering device 22, here for top layers. The technological difference is that the solid wood 18 in the middle layer of a material board 27, in particular OSB, is suitable for raising the quality of the material board 27 to the required level.

If there are problems with replenishing old wood or if fresh wood can be obtained from the surrounding area, fresh wood can also be processed in the plant as an option. For this purpose, a store 32 for the starting material 31 (tree trunks are shown here as fresh wood by way of example) would be necessary and preferably a suitable shredding device

33 for crushing the starting material 31 into the input material 34 for the system. Optionally, only one comminuting device 3 could alternately comminute the starting material 31 and 1 and accordingly further distribute it. Advantageously, however, the material flows should not be mixed. The input material is analogous to the processing on the waste wood side

34 classified in a downstream classification device 35 and preferably also in a micro-fraction 37 and a macro-fraction 38 and fines 36 and Oversize 39 sorted. The oversizes are preferably fed back to the comminution device 33 and the fine material is used either for further classification or directly thermally in the energy system 28 . The microfraction 37 is particularly preferably stored temporarily in a storage bunker 30 and the macrofraction 38 in a storage bunker 40 for optimal control of the material flows. It is thus also possible in an advantageous manner to feed the different material flows from the storage bunkers 15, 17, 19, 30 and 40 as required and in a uniform ratio to one or more preparations 20, 21.

Dashed arrows for material flows show the possibility of alternatively diverting the material flows from different storage bunkers as required, so that, for example, the microfraction 14 from the storage bunker 15 does not get into the processing 20 for the top layer but into the processing 21 for the middle layer of a material panel 27.

A control device 43 is particularly advantageously arranged for the control and regulation of the material flows, the connections (measurement information, control specifications, control circuits) of which to the system are shown purely schematically and only by means of small entry and exit arrows 1630 for a better overview.

Reference List P1630

1 starting material (waste wood) 23 spreader (middle layer)

2 bearing 24 forming tape

3 crushing device 25 press

4 input material 26 feed direction of 24

5 classification device 27 material plate

6 fines 28 energy plant

7 microfraction 29 top layer material

8 Macrofaction 30 Storage Bunker for 37

9 oversizes 31 starting material (fresh wood)

10 cleaning device 32 bearings

11 macro fraction (cleaned) 33 crushing device

12 sorting device 34 input material

13 foreign material 35 classification device

14 Microfraction (cleaned) 36 Fines

15 storage bunker for 14 37 micro fraction

16 wood-based materials (from 11 ) 38 macro fraction

17 storage bins for 16 39 oversizes

18 Solid Wood (from 11) 40 Storage Bunker for 38

19 storage bunker for 18 41 wood chips (waste wood)

20 preparation (top layer) 42 storage for 41

21 preparation (middle layer) 43 control device

22 spreading device (top layer)

Claims

Plant for the production of material panels, comprising a store (2) for waste wood delivered as starting material (1), optionally a crushing device (3) for the starting material (1) into an input material (4) for the plant, a classifying device (5) for Division of the starting material (1) and/or the input material (4) into differentiated fractions and a cleaning device (10) for separating foreign material (13) from at least one of the fractions, a treatment (20, 21) for the production and transfer of scatterable particles in a scattering device (22, 23), a forming belt (24) for receiving the scattered particles and a press (25) for pressing the scattered particles into a material panel (27), the at least one cleaning device (10) having a sorting device (12) for dividing the cleaned fraction into solid wood (18) and wood-based materials (16) and the sorting device (12) directly or ind is operatively connected directly to the transfer of the cleaned fraction with the processing (20, 21). Plant according to Claim 1, characterized in that a further bearing (42) for receiving delivered wood chips (41) from the recycling circuit is operatively connected to the cleaning device (10) and/or the sorting device (12). Plant according to Claim 1 or 2, characterized in that in the classification device (5) there are means for producing at least three fractions, preferably fines (6), oversizes (9) and a usable fraction, and that particularly preferably in the classification device (5 ) further means for dividing the usable fraction into a micro-fraction (7) and a macro-fraction (8) are arranged. Plant according to one or more of the preceding claims, characterized in that in the cleaning device (10) an X-ray device for the detection and removal of foreign substances and/or in the sorting device (12) an NIR device or a camera system for distinguishing between solid wood (18) and wooden material (16) as well as correspondingly controllable separating means or separating means are arranged. Plant according to one or more of the preceding claims, characterized in that with an indirect connection between the sorting device (12) and processing (20, 21) at least one storage bunker (15, 17, 19) for the various classified and / or cleaned material flows are arranged . Plant according to one or more of the preceding claims, characterized in that to support the necessary throughput of the starting material (1) from waste wood, a store (32) for starting material 31) from fresh wood, a shredding device (33), an optional classifying device (35), an optional storage bunker in operative connection with the treatment (20, 21) are arranged. Plant according to one or more of the preceding claims, characterized in that in the crushing device (3, 33) means for crushing the starting material (1) to a size of less than 100 mm, preferably less than 90 mm, particularly preferably less than 80 mm and very particularly preferably less than 70 mm and in particular a drum chopper is arranged as the crushing device (3). Plant according to one or more of the preceding claims, characterized in that in the classification device (5)

Means for separating oversizes (9) with a size of more than 100 mm, preferably more than 90 mm, more preferably more than 80 mm and most preferably more than 70 mm and/or means for separating fines (9) with a size of smaller 5 mm, preferably less than 3 mm, particularly preferably less than 2 mm and very particularly preferably less than 1 mm and/or

Means for separating a macrofraction (8) with a size of greater than 10 mm, preferably greater than 12 mm, particularly preferably greater than 15 mm and very particularly preferably from coarse wood chips up to a size of the oversize (9) are arranged and / or

Means for separating a micro-fraction (7) with a size of greater than 1 mm, preferably greater than 3 mm, particularly preferably greater than 5 mm and up to a size of the macro-fraction (8) are arranged. Plant according to one or more of the preceding claims, characterized in that a control device (43) or regulating device for controlling the material flows is arranged, which is connected at least to the storage bunkers (15, 17, 19, 30, 40) of the solid wood (18), the Wood-based materials (16), the micro-fraction (7, 37) and/or the macro-fraction (38) and is preferably suitable for gravimetric or volumetric volume control of the material flows. 21 Plant according to one or more of the preceding claims, characterized in that the storage bins (15, 17, 19) are arranged so that they can be connected to various preparations (20, 21) or mixing devices in order to adjust the ratios of the material flows and/or to adjust the material panel to be produced . Process for the production of material panels in a plant with the following process steps: storing waste wood as the starting material (1), comminuting the starting material (1) into an input material (4), preferably to a predetermined grain size distribution, by means of a comminuting device (3), classifying the Input material into differentiated fractions, cleaning at least one of these fractions using a cleaning device (10), processing this fraction in a processing unit (20, 21) into scatterable particles in a scattering device (22, 23), scattering the particles on a forming belt and compressing the particles to a material panel (27) in a press (25), wherein after the fraction has been cleaned in a cleaning device (10), a sorting device (12) sorts the cleaned fraction into solid wood (18) and wood-based materials (16) and, as required, undergoes processing (20 , 21 ) are passed. Method according to claim 11, characterized in that also delivered, preferably already cleaned old wood is stored in the form of wood chips and the cleaning device (10) and/or the sorting device (12) are supplied. Method according to Claim 11 or 12, characterized in that in the classification device (5) at least three fractions, fines (6), 22

Oversizes (9) and a usable fraction for the cleaning device (10) are provided and that particularly preferably the usable fraction is classified into at least one micro-fraction (7) and one macro-fraction (8). Method according to one or more of the preceding method claims, characterized in that in the cleaning device (10) an X-ray device for the detection and ejection of foreign substances and/or in the sorting device (12) an NIR device or a camera system for distinguishing between solid wood (18) and wooden material (16) as well as correspondingly controllable release agents are used. Method according to one or more of the preceding method claims, characterized in that at least one storage bunker (15, 17, 19) for the various classified and/or cleaned fractions is arranged downstream of the cleaning device (10) and/or the sorting device (12). Method according to one or more of the preceding method claims, characterized in that in order to support the necessary throughput in the production of material panels, fresh wood is stored in a separate warehouse (32) as starting material (31), crushed in a crushing device (33), and in an optional Classification device (35) classified and, if necessary, stored in a storage bunker (30, 40) before processing. Plant according to one or more of the preceding claims, characterized in that in the crushing device (3, 33) the starting material (1) to a size of less than 100 mm, preferably less than 90 mm, particularly preferably less than 80 mm and very particularly 23 is preferably comminuted from less than 70 mm and, in particular, a drum chopper is used as the comminuting device (3). Method according to one or more of the preceding method claims, characterized in that in the classification device (5)

Means for separating oversizes (9) with a size of greater than 100 mm, preferably greater than 90 mm, particularly preferably greater than 80 mm and very particularly preferably greater than 70 mm and/or

Means for separating fines (9) with a size of less than 5 mm, preferably less than 3 mm, particularly preferably less than 2 mm and very particularly preferably less than 1 mm and/or

Means for separating a micro-fraction (7) with a size of greater than 1 mm, preferably greater than 3 mm, particularly preferably greater than 5 mm and up to a size of the macro-fraction (8) can be used. Method according to one or more of the preceding method claims, characterized in that a control device (43) or regulating device distributes the individual material flows in the plant and in the course of this at least the storage bins (15, 17, 19, 30, 40) of the solid wood (18) , which controls the wood-based materials (16), the micro-fraction (7, 37) and/or the macro-fraction (38) and their discharge devices and preferably carries out the control based on gravimetric or volumetric measurement results of the material flows. 24 Method according to one or more of the preceding method claims, characterized in that the storage bunkers (15, 17, 19) in the system are equipped with various preparations (20, 21) or mixing devices to adjust the ratios of the material flows and/or to adjust the material panel to be produced get connected.