METHOD AND SYSTEM FOR PRODUCING A THREE-DIMENSIONALLY DEFORMED PLATE

Description

[0001] The invention relates to a method for producing a three-dimensionally shaped board from a wood fiber material. Furthermore, the invention relates to a system for producing a three-dimensionally shaped board from a wood fiber material using the method.

[0002] Three-dimensionally formed panels made of a wood fiber material are known per se from the prior art. They serve, for example, as the core layer for a sandwich panel. Such a sandwich panel can be used, for example, as a furniture panel or a door panel. Such a sandwich panel consists of a core layer that is covered with a cover layer on at least one side, but typically on both sides. The core layer can be formed from a three-dimensionally formed panel, whereas the cover layers are usually flat panels.

[0003] A core layer in this sense is disclosed, for example, in EP 2 660 408 B1. This previously known core layer comprises zigzag-shaped wooden elements that are connected to one another, preferably glued together. A plurality of such wooden elements are used to form the core layer, each of which has plate-shaped regions arranged in a zigzag pattern, with a zigzag region of one wooden element forming a common edge with an adjacent zag region of the same wooden element. The adjacent wooden elements form intersection points between themselves, where adjacent wooden elements are connected to one another.

[0004] A core layer formed from wooden elements is also known from EP 3 066 272 B1. According to this prior art, the wooden elements are also zigzag-shaped, with a zigzag region adjoining a zag region with a common edge interposed between them. However, both the zigzag and zag regions, as well as the common edge, can be curved, resulting in a wave-like pattern.

[0005] CA2988159C discloses a method for producing a three-dimensionally deformed board from a wood fiber material and introducing a section of a starting board between two rollers of a forming station, wherein the rollers each have a profiling of the outer surface, so that the starting board is formed section by section into a three-dimensionally deformed board.

[0006] What the two aforementioned publications EP 2 660 408 B1 and EP 3 066 272 B1 have in common is that a plurality of wooden elements are used to form a core layer, which are to be arranged randomly and permanently bonded to one another. In contrast, EP 3 456 498 A1 discloses a method for producing a three-dimensionally formed panel from a wood fiber material, in which a prefabricated, flat MDF panel is used as the starting panel, which is then further formed into a corrugated panel in a forming station. The process is carried out continuously, and at the end of the forming process, a one-piece corrugated panel is produced, which can also be used as the core layer for a sandwich panel.

[0007] The prior art forming station according to EP 3 456 498 A1 for forming a flat MDF board into a corrugated board has a pair of two rollers, each with a wave-shaped profile on the outside. This wave-shaped profile of the rollers ensures that the flat board fed into the forming station is formed into a corrugated board. The resulting wave pattern is sinusoidal, meaning it produces identically shaped half-waves, with a positive half-wave followed by a negative half-wave, and so on.

[0008] The method known from EP 3 456 498 A1 is a generic method and has proven itself in everyday practical use. However, there is a need for improvement, as it has been found that the previously known wave-shaped design of the three-dimensionally formed plate is not equally suitable for all applications. Therefore, Task The invention aims to provide a method and a system for producing a three-dimensionally deformed plate, which enable a simple and cost-effective production of a three-dimensionally deformed plate, wherein different plate shapes are to be made possible in a simple manner depending on the later application.

[0009] To Solution To achieve this object, the invention proposes a method for producing a three-dimensionally shaped board from a wood fiber material, comprising the following steps Providing a prefabricated, flat wood fiber material board as a starting board, preheating the starting board in sections, wetting a preheated section of the starting board with an atomized liquid mixture of water and a release agent, introducing a section of the starting board that has been preheated and wetted with a liquid mixture of water and a release agent between two rollers of a forming station, wherein the rollers each provide a circumferentially undulating profiling of the outer surface, so that the starting board is formed in sections into a board with a undulating shape, wherein rollers are used whose respective profiling has half waves that follow one another in the circumferential direction and that at least partially have a different extension in the circumferential direction.

[0010] The starting point of the process according to the invention is a prefabricated, flat wood fiber board. This serves as the starting board. The wood fiber board can be a mat of glued, pre-compacted fibers or a pre-pressed fiberboard. Preferably, an MDF board is used as the wood fiber board. Especially with a pre-pressed fiberboard, different densities can be used depending on the subsequent use of the corrugated board produced according to the process according to the invention. The only essential aspect of the invention is that a flat board made of a wood fiber board is used as the starting board for carrying out the process.

[0011] "Wood fiber material" within the meaning of the invention generally means a material made of lignocellulose-containing fibers or chips, which preferably also comprises, i.e., contains, wood fibers or chips. Fibers or chips made of other materials may also be present and mixed or blended with the wood fibers or chips. Generally, lignocellulose-containing fibers or chips are present, either as a mat, as a scrim, or as a pre-pressed board. In the case of a scattered mat or scrim, the fibers or chips can be glued or unglued. In this respect, "board" within the meaning of the invention also includes a mat scattered from lignocellulose-containing fibers or chips, or a scrim made of such fibers or chips.The only decisive factor for the implementation of the process is that a mat scattered from lignocellulose-containing fibers or chips, a prepared scrim, or a tightly pressed board is available as a semi-finished product that is flat and serves as the starting point for the implementation of the process according to the invention. In this respect, the invention is not limited to a tightly pressed board made solely from wood fibers as the starting board.

[0012] The starting plate is first preheated. This occurs section by section, with the plate continuously moving forward past a heating device. The section of the worktop overlapping the heating device is consequently preheated. Infrared radiators, for example, can be used as heating devices, which irradiate the starting plate from both sides, thus heating the top and bottom of the starting plate. Alternatively, microwave devices, contact heat exchangers, and / or similar devices can also be used. It is crucial that the heating device can preheat the starting plate to a sufficient temperature level.

[0013] Preheating the starting plate serves to prepare for the next process step. Accordingly, the starting plate is wetted with an atomized liquid mixture of water and a release agent. The atomization creates an aerosol that deposits on the preheated section of the starting plate. Thus, the preheated section of the starting plate is wetted.

[0014] A mixture of water and release agent is used as the atomized liquid mixture. The water is used in the subsequent process to generate steam, which is required for the subsequent forming of the starting sheet. The purpose of the release agent is to ensure that the worktop being formed does not stick to the rollers of the forming station. The water to release agent mixing ratio can be, for example, in the range of 99:1 to 1:99, preferably in the range of 99:1 to 50:50, and even more preferably in the range of 99:1 to 90:10.

[0015] Preheating the starting platen serves primarily to ensure that the liquid mixture is distributed evenly across the respective surfaces of the starting platen. Furthermore, preheating ensures that the liquid mixture applied to the work platen reaches a certain preheating temperature, thus ensuring that the water evaporates safely in the subsequent forming station.

[0016] Depending on the heating equipment used, it may also be possible to preheat the starting board and wet it in sections in a single process step. It is crucial that the liquid mixture is evenly distributed over the starting board, so that, on the one hand, a homogeneous release agent distribution is achieved, and, on the other hand, that the applied water reaches a pre-temperature such that the subsequent evaporation of the water is reliably ensured. Furthermore, preheating ensures that the wood fiber composite board is thoroughly heated down to the middle layer of the material. This heating contributes to the softening of the fiber composite and supports the forming process.

[0017] The section of the starting plate, preheated according to the previous process steps and wetted with a liquid mixture of water and a release agent, is then guided between two rollers in a forming station. The rollers are spaced apart and form a gap between them whose gap size is smaller than the thickness of the starting plate. The starting plate is thus compressed between the two rollers and simultaneously formed. The rollers each provide a circumferentially undulating profile of the outer surface, so that the starting plate is formed into a plate with a corrugated shape. In this process, the section of the worktop that is currently located between the rollers of the forming station is always formed. Since the process is carried out continuously, this also results in a section-by-section continuous forming of the flat starting plate into a corrugated formed plate.

[0018] It is of key importance to the invention that rolls are used whose respective profiles have half-waves that follow one another in the circumferential direction and that at least partially have a different extent in the circumferential direction. The half-period duration provided for each half-wave therefore varies, with at least two different half-period durations being provided. Accordingly, it is therefore provided that the respective profile of the rolls provides half-waves that are of different lengths, i.e. that have a different extent in the circumferential direction. The result of this design is that the formed starting plate is wave-shaped, but that the individual wave crests and wave troughs have a different extent in the longitudinal direction of the plate. This results in a wave design that is different from the sinusoidal wave design.This offers the advantage of creating a waveform that is more optimally adapted to the forces that will occur during subsequent use. In particular, it is possible to achieve improved force introduction into the plate. Furthermore, the different extensions of the half-waves in the longitudinal direction of the plate allow any functional elements to be connected to the plate to be arranged more optimally on the plate, with a view to improved force introduction. Functional elements in this sense include, in particular, fastening elements such as screws, nuts, or the like, but also connecting elements, connection elements, holders, and / or the like.

[0019] The inventive design is particularly suitable for the subsequent use of the formed panel as the core layer of a sandwich panel, for example, a furniture panel or a door leaf. This is because the inventive design makes it possible to arrange the functional elements required for typical use of a door leaf and / or a furniture panel at the designated locations on the formed panel, or to create corresponding areas through the corrugated shape that are particularly suitable for the arrangement of such functional elements. This simplifies subsequent use and also opens up application possibilities for the corrugated panel that would otherwise not be possible in this form.

[0020] In addition, it is possible to maintain rollers of different designs, which are used in the forming station for each forming task. This allows for a variety of plate shapes, thus providing a broader range of applications.

[0021] According to a further feature of the invention, it is provided that rollers are used whose respective profiling has half-waves which are designed to be substantially flat at least in sections in order to form a substantially flat contact surface on the plate side.

[0022] According to this feature, at least some of the half-waves have a substantially flat design in sections. This creates a substantially flat contact surface, which, during subsequent use of the deformed plate, allows connecting elements or functional elements for force-optimized transmission to be arranged on the deformed plate with full-surface support. This is not possible with a purely sinusoidal wave design, as known from the prior art, for example, according to EP 3 456 498 A1.

[0023] The essentially flat design can be achieved, for example, by having a half-wave with a plateau. The half-wave can be designed as a positive half-wave, i.e., a wave crest, or as a negative half-wave, i.e., a wave trough. The plateau provided by the half-wave is preferably aligned essentially plane-parallel to the zero line, whereby the plateau leads to a contact surface on the plate side that runs essentially plane-parallel to the centerline of the plate. This allows for functional elements to be arranged on the plate aligned with the centerline.

[0024] In this context, according to a further feature of the invention, it is proposed that a strip body or the like can also be used as a functional element. Such a strip body is to be aligned transversely to the longitudinal direction of the panel and arranged within a corrugation trough. Such a strip body then extends within this corrugation trough, wherein a substantially flat design of the corrugation trough has the advantage that the strip body can be connected to the panel, forming full-surface contact with the panel. This allows the simple use of flat strip bodies, thus eliminating the need to use strip bodies that must be adapted to a specific profile of the panel in a separate work step.

[0025] Alternatively, according to a further feature of the invention, rollers are used whose respective profiles have half-waves which are essentially concave or convex, at least in sections, to form a substantially curved contact surface on the panel side. This enables a shape that differs from the plateau design and serves, in particular, to be able to accommodate correspondingly designed functional elements in an optimized position. In this way, fixing points with a wide variety of geometric arrangements can be created, which can serve to create an improved connection to the cover layers of a sandwich panel when the three-dimensionally formed panel is later used as the core layer of a sandwich panel.

[0026] With regard to the geometric design of the three-dimensionally deformed plate, a wide variety of shapes are conceivable. These can be represented mathematically, for example, by a correspondingly designed harmonic of a sine wave. The essential aspect of the invention is therefore that the invention proposes a design that deviates from a sinusoidal waveform in that at least two half-wave types are provided, which have a different extension in the circumferential direction of the roll, thus providing a different half-period duration. The invention is not limited to the design of just two different half-waves. Rather, a plurality of different half-waves can be provided, which can also be connected to one another in a different order as desired.The individual half-waves can provide essentially flat contact surfaces, essentially curved contact surfaces, or other contact surfaces. This advantageously makes it possible to provide a design that allows for optimized force distribution and / or absorption, both when used alone as a corrugated panel or when combined with cover layers as a sandwich panel.

[0027] According to a further feature of the invention, rolls are used whose respective profiles have exclusively negative or positive half-waves. Accordingly, the profile provides either only negative or only positive half-waves. These are arranged one after the other in the circumferential direction, with some of the half-waves having a different extension in the circumferential direction compared to the other half-waves.

[0028] Alternatively, according to a further feature of the invention, only rollers are used whose profile features positive and negative half-waves alternating in the circumferential direction. Accordingly, a wave profile is used that features wave crests and wave troughs that follow one another in the longitudinal direction of the plate, i.e., in the circumferential direction of the rollers. In accordance with the inventive design, at least some of these half-waves are elongated in the circumferential direction, so that corresponding contact surfaces on the plate can be formed for the arrangement of functional elements, in particular.

[0029] According to a further feature of the invention, it is provided that rollers are used whose respective profiling has two different half-wave designs, wherein three half-waves of a first half-wave design are followed by a half-wave of a second half-wave design.

[0030] According to this further development of the invention, at least two different half-wave designs are provided. Accordingly, a first half-wave type and a second half-wave type are provided. In this case, the second half-wave type can, for example, be one which, in contrast to the first half-wave type, has a longer extension in the circumferential direction of the rollers. As a result of this design, a design is created on the plate side in which a certain number of shorter half-waves, i.e., half-waves of the first embodiment, are followed by half-waves of the second embodiment, followed again by half-waves of the first embodiment, and so on. According to a special proposal of the invention, it is proposed in this context that three half-waves of a first embodiment are followed by a half-wave of a second embodiment. This therefore results in a pattern of three, one, three, one, etc., where the three half-waves always represent a half-wave of the first type and the enclosed half-wave is always one of the second type.

[0031] According to a further feature of the invention, it is provided that a wood fiber composite board with a surface weight of 1.0 kg / m 2 to 3.0 kg / m 2 is used. The use of such a wood fiber composite board has the advantage of providing sufficient stability while simultaneously reducing the overall weight, so that the forming of such a wood fiber composite board is particularly suitable for producing a deformed board that is suitable as a core layer for sandwich panels, particularly for furniture construction.

[0032] According to a further feature of the invention, a wood fiber composite board with a thickness of 1 mm to 3 mm, preferably 2 mm, is used. Carrying out the process according to the invention results in a densification of the starting board of at least 30%.

[0033] According to a further feature of the invention, it is provided that the deformation is carried out at a temperature in the range of 200 °C to 300 °C, preferably from 200 °C to 260 °C, even more preferably from 200 °C to 240 °C and most preferably from 220 °C.

[0034] The heat is introduced during forming to evaporate the previously applied liquid mixture of water and a release agent. The rollers, which are in contact with the top and bottom of the board during the forming process, prevent the steam generated by heating from escaping upwards or downwards. It is thus forced into the board material. This softens the material, which then makes it possible to form the prefabricated flat base board into a corrugated board in the manner described above. The steam in the material of the base board has two effects. Firstly, it activates the lignin contained in the wood fiber material, and secondly, it activates the residual binder that did not fully cure during the production of the prefabricated MDF board.During the final cooling of the deformed board, which occurs after it leaves the forming station, the lignin activated in the forming station and the activated residual binder harden, so that the deformed structure of the board is maintained permanently.

[0035] To achieve the desired effect, the temperature must be selected appropriately, which is why the temperature ranges suggested above should be used. Of course, care must be taken to ensure that excessive temperature does not lead to undesirable discoloration on the surface of the sheet being formed.

[0036] According to a further feature of the invention, the deformation is carried out at a linear load in the range of 100 N / mm to 300 N / mm, preferably 170 N / mm to 250 N / mm, most preferably 200 N / mm. The deformation takes place with simultaneous heat application, which then leads to a deformation of the originally flat starting plate in the manner already described.

[0037] To Solution In order to achieve the above object, the invention further proposes a system for producing a three-dimensionally shaped board made of wood fibre material according to the method described above, comprising a) a prefabricated, flat wood fiber material board as the starting board and b) a treatment plant with i) a preheating station, ii) a wetting device and iii) a forming station, wherein the forming station has a pair of rollers with rollers, each of which provides a circumferentially wave-shaped profiling of the outer surface, wherein the respective profiling has half-waves which follow one another in the circumferential direction and which at least partially have a different extension in the circumferential direction.

[0038] A system of the type according to the invention provides the advantages already listed above. Further developments of the system according to the invention are set out in the further subclaims.

[0039] The invention further proposes a sandwich panel which has a corrugated panel produced according to the method according to the invention, which is connected to a flat cover layer on at least one side, preferably on both sides.

[0040] Further features and advantages of the invention will become apparent from the following description with reference to the figures. Fig. 1 shows a schematic representation of a method implementation according to the invention; Fig. 2 shows a schematic side view of a pair of rollers of the type according to the invention; Fig. 3 shows a schematic representation of a roller design according to the invention and a corrugated plate designed according to the invention; Fig. 4 shows a schematic representation of a roller design according to the invention and a corrugated plate designed according to the invention according to a second embodiment; Fig. 5 shows a schematic sectional representation of a sandwich plate with a corrugated plate according to Figure 3and Fig. 6 in schematic sectional view a sandwich panel with a corrugated plate according to Figure 4 .

[0041] Figure 1 shows a schematic representation of a method implementation according to the invention or a system according to the invention.

[0042] A treatment plant 1 is shown. This plant has a preheating station 2, a wetting device 3, and a forming station 4.

[0043] The forming station 4, in turn, has a roller pair 9. This consists of two rollers 10 and 11, which are arranged at a distance from each other, forming a gap. Each roller has an outer surface 23 equipped with a profile described in more detail below.

[0044] The wetting device 3 provides a spray device 12. In the intended use, a liquid mixture of water and a release agent is sprayed via the spray device 12, resulting in a spray cone 13 shown as an example. Figure 1 In the embodiment shown, only one spray device 12 is used. It goes without saying that a plurality of such spray devices could be used, including those arranged beneath a plate passing through the treatment system 1.

[0045] The preheating station 2 has two heating devices 14 and 15. These heating devices can, in particular, be infrared radiators. However, other heating devices such as microwave radiators or the like are also conceivable. It is crucial that, during the process according to the invention, a plate is preheated, which further ensures the homogeneous distribution of a liquid mixture of water and a release agent applied to the plate.

[0046] The treatment plant 1 described above allows the process to be carried out as follows.

[0047] A wood fiber composite board is fed into the processing system 1 as the starting board, as indicated by arrow 7. The wood fiber composite board is flat and prefabricated. In the illustrated example, the prefabricated wood fiber composite board is an MDF board 5.

[0048] The MDF board 5 passes through the treatment plant 1 in the direction of arrow 7, wherein first a preheating takes place in sections, then a wetting of the preheated section and then a deformation of the board 5 takes place in the forming station 4, so that the result is a corrugated board 6, i.e. a three-dimensionally deformed board 6, which leaves the treatment plant 1 in the direction of arrow 8.

[0049] Figure 2shows a schematic side view of the rollers 10 and 11 of the roller pair 9 of the forming station 4. As can be seen from this illustration, the rollers 10 and 11 each have a profile which has 22 successive half-waves in the circumferential direction. A half-wave is formed by a wave crest or a wave trough, with a wave crest representing a positive half-wave and a wave trough representing a negative half-wave. With reference to a line passing through the wave-shaped course as the zero line, a wave crest represents a half-wave above the zero line and a wave trough represents a half-wave below the zero line.

[0050] As the representation according to Figure 2As can be seen from the example of the upper roller 10, a first half-wave 16 is followed by a second half-wave 17, a third half-wave 16, a fourth half-wave 17, a fifth half-wave 18, etc. It is of essential importance to the invention that the half-waves at least partially have a different extension in the circumferential direction 22, wherein in the embodiment shown, the half-waves 16 and 17 each provide a first extension, whereas the half-waves 18 and 19 provide a second extension, which is greater in the circumferential direction 22 than the extension of the half-waves 16 and 17. According to the Figure 2In the wave patterns shown, three half-waves of a first type, i.e. a first half-wave design, are followed by one half-wave of a second type, i.e. a second half-wave design. In the exemplary embodiment shown, half-waves 16 and 17 belong to the first half-wave type, whereas half-waves 18 and 19 belong to the second half-wave type. The only difference between half-waves 16 and 17 of the first type is that half-waves 16 are positive half-waves, whereas half-waves 17 are negative half-waves. The same applies to the half-waves of the second type. Here, half-waves 18 are positive half-waves, whereas half-waves 19 are negative half-waves.

[0051] The half-waves 18 and 19, which have a longer extension in the circumferential direction 22, each provide a substantially flat plateau 20. This plateau formation provides a substantially flat contact surface 24 with respect to a finally formed plate 6, as can be seen from Figure 3 results.

[0052] How Figure 3As can be seen in an overview, a roller is shown with reference to the plane of the drawing on the left, with the profile resulting with regard to the plate 6 being shown to the right of the roller. As can be seen from this illustration, the profile of the deformed plate 6 is wave-shaped, with the half-waves in the longitudinal direction of the deformed plate 6 partly having a different longitudinal extent. Half-waves 16 and 17 which are shorter in the longitudinal direction alternate with half-waves 18 and 19 which are longer in the longitudinal direction. A total of two wave types are provided, namely a first half-wave type pair 16 and 17 and a second half-wave type pair 18 and 19. In this case, the half-waves 16 are positive and the half-waves 17 are negative. The same applies to half-wave type 2. Here, the half-waves 18 are positive and the half-waves 19 are negative.The distance X between two repeating waves is 303 mm in the illustrated embodiment. Other configurations are also conceivable, of course, whereby the distance X in the illustrated embodiment is between two negative half-waves of type 2, in this case half-wave 19.

[0053] The Figure 3 The roller shown still shows the "zero line" 21, around which the half-waves are guided, resulting in wave peaks, namely positive half-waves, and wave troughs, i.e. negative half-waves, in the manner already described.

[0054] Figure 4 allows an alternative design in a schematic representation Figure 3As can be seen from this illustration, the half-waves 18 and 19 according to this exemplary embodiment do not have a substantially flat plateau, but are convex and concave, respectively. This configuration results in a fully formed plate 6 which, corresponding to the configuration of the half-waves 18 and 19, has substantially curved contact surfaces 25.

[0055] The examples of implementation according to the Figures 3 and 4 are only illustrative and not restrictive. The method according to the invention allows not only a plate profiling as described in the Figures 3 and 4is shown by way of example. Rather, it is within the scope of the invention to select an appropriate profiling depending on the application. The only thing that is essential to the invention is that half-waves 16 and 17 on the one hand and half-waves 18 and 19 on the other hand are provided, which are of different lengths in the circumferential direction of the rollers and in the longitudinal direction of the later plates, i.e. have a different extension. The half period duration provided for each half-wave therefore differs. Depending on the later intended use, a large number of differently designed half-waves can be provided, as can the arrangement of these half-waves. For example, a recurring half-wave pattern can be provided for each roller circumference, although this is not mandatory. A design is also conceivable in which a recurring half-wave pattern only results from the rollers being rotated by more than 360°.

[0056] The Figures 5 and 6 Finally, two sandwich panels 26 are shown as examples. Each sandwich panel 26 has a deformed panel 6 as well as a first cover layer 27 and a second cover layer 28. The cover layers 27 and 28 are each arranged with reference to the plane of the drawing according to the Figures 5 and 6 arranged on the top and bottom of the deformed plate 6, thus holding the deformed plate 6 between them.

[0057] According to the embodiment according to Figure 5 a deformed plate 6 is used, which is similar to that according to Figure 3 The embodiment according to Figure 6 shows a deformed plate 6 corresponding to the embodiment according to Figure 4 .

[0058] Examples include the Figures 5 and 6 Functional elements 29 are shown, each of which is arranged on the deformed plate 6. According to the embodiment according to Figure 5As functional element 29, a strip with a substantially rectangular cross-section is used, which bears against a substantially flat contact surface 24 of the deformed plate 6.

[0059] In contrast, Figure 6 a functional element 29 which, on its side facing the deformed plate 6, provides a contour which corresponds to the associated curved contact surface 25 of the deformed plate 6. Reference symbol

[0060] 1 Treatment plant 2 Preheating station 3 Wetting device 4 Forming station 5 MDF board 6 Three-dimensionally formed board 7 Arrow 8 Arrow 9 Pair of rollers 10 First roller 11 Second roller 12 Spraying device 13 Spray cone 14 Heating device 15 Heating device 16 Half-wave type 1 17 Half-wave type 1 18 Half-wave type 2 19 Half-wave type 2 20 Plateau 21 Zero line 22 Circumferential direction 23 Outer surface 24 Flat contact surface 25 Curved contact surface 26 Sandwich panel 27 First cover layer 28 Second cover layer 29 Functional element

Claims

1. Method for producing a three-dimensionally deformed plate from a wood fiber material, the method comprising the following steps: - providing a prefabricated, flat wood fiber material plate as a starting plate, - preheating the starting plate in sections, - wetting a preheated section of the starting plate with an atomized liquid mixture of water and a separating agent, - inserting a preheated section of the starting plate, which has been wetted with a liquid mixture of water and a separating agent, between two rollers (10, 11) of a forming station (4), wherein the rollers (10, 11) each provide a wave-shaped profiling of the outer surface (23) in the circumferential direction (22), so that the starting plate is transformed in sections into a plate (6) with a wave shape, characterized in that rollers (10, 11) are used whose respective profiling has half-waves (16, 17, 18, 19) following one another in the circumferential direction (22), which have at least partially different extensions in the circumferential direction (22).

2. Method according to claim 1, wherein rollers (10, 11) are used the respective profiling of which has half-waves (16, 17, 18, 19) which are designed to be essentially flat, at least in sections, in order to form a plate-side, essentially flat contact surface (24).

3. Method according to claim 1, wherein rollers (10, 11) are used the respective profiling of which has half-waves (16, 17, 18, 19) which are designed to form a plate-side, essentially curved contact surface (25) which is essentially concave or convex at least in sections.

4. Method according to claims 1 to 3, wherein rollers (10, 11) are used the respective profiling of which has exclusively negative or positive half-waves (16, 17, 18, 19).

5. Method according to claims 1 to 3, wherein rolls (10, 11) are used the respective profiling of which has positive and negative half-waves (16, 17, 18, 19) successively alternating in the circumferential direction (22).

6. Method according to claim 5, wherein rollers (10, 11) are used the respective profiling of which has two different half-wave designs, wherein three half-waves (16, 17) of a first half-wave design are followed by one half-wave (18, 19) of a second half-wave design.

7. Method according to any of the preceding claims, characterized in that a wood fiber material plate with a surface weight of 1.0 kg / m2 to 3.0 kg / m2 is used.

8. Method according to any of the preceding claims, characterized in that a wood fiber material plate with a thickness of 1 mm to 3 mm, preferably 2 mm, is used.

9. Method according to any of the preceding claims, characterized in that the deformation is carried out at a temperature in the range of 200°C to 300°C, preferably 200°C to 260°C, more preferably 200°C to 240°C, and most preferably 220°C.

10. Method according to any of the preceding claims, characterized in that it is carried out continuously.

11. Method according to any of the preceding claims, characterized in that an MDF plate (5) is used as the flat wood fiber material plate.

12. System for producing a three-dimensionally deformed plate made of wood fiber material according to the method according to any of the preceding claims, the system comprising a) a prefabricated, flat wood fiber material plate as the base plate and b) a treatment plant (1) with i) a pre-heating station (2), ii) a wetting device (3) and iii) a forming station (4), wherein the forming station (4) comprises a pair of rollers (9) with rollers (10, 11) that each provide a profile of the outer surface that is wave-shaped in the circumferential direction (22), wherein the respective profile has half-waves (16, 17, 18, 19) which follow one another in the circumferential direction (22) and have at least partially different extensions in the circumferential direction (22).

13. System according to claim 12, characterized in that rollers (10, 11) are provided, the respective profiling of which has half-waves (16, 17, 18, 19) which are designed to be essentially flat, at least in sections, in order to form a plate-side contact surface (24).

14. System according to claim 12 or 13, characterized in that rollers (10, 11) are provided, the respective profiling of which has exclusively negative or positive half-waves (16, 17, 18, 19).

15. System according to claim 12 or 13, characterized in that rollers (10, 11) are provided, the respective profiling of which has positive and negative half-waves (16, 17, 18, 19) successively alternating in the circumferential direction (22).

16. System according to any of the preceding claims 12 to 15, characterized in that rollers (9, 10) are provided, the respective profiling of which has two different half-wave designs, wherein three half-waves of a first half-wave design are followed by one half-wave of a second half-wave design.