Method for filling uneven sections in a veneer or derived timber board

Abstract

The invention relates to a method for filling an unevenness in the surface of a veneer or wood-based panel, comprising the steps of: - detecting the unevenness in the surface of the veneer or wood-based panel, - introducing material into the unevenness, which is recessed behind the surface. To simplify and make the filling of unevenness in the surface of veneer or wood-based panels more economical, it is provided that the material is introduced using a dot matrix printer. The invention further comprises a veneer or wood-based panel with a filled unevenness.

Description

[0001] The invention relates to a veneer or wood-based panel whose surface has unevenness.

[0002] Veneered or engineered wood panels have a surface with irregularities. In veneers, these irregularities are caused by cracks, knots, loose branches, or holes. In engineered wood panels, irregularities occur in the form of gaps or cracks between wood particles, irregularities due to disturbances in the distribution of fibers or chips, or, particularly in particleboard with large chips in the outer layer, such as OSB (Oriented Strand Board). Currently, these irregularities are filled by applying filler and then sanding, as described in DE 10 2020 049 638 A1, DE 10 2009 007114 A1, or EP 3 216 574 B1. Filling is predominantly done by hand, although attempts at automation are known. Manual filling and subsequent sanding are time-consuming and expensive.

[0003] The purpose of the invention is to simplify and make more economical the filling of unevenness in the surface of a veneer or wood-based material surface.

[0004] This problem is solved using a method according to claim 1 and a veneer or wood-based panel according to claim 9.

[0005] The inventive method for filling an unevenness in the surface of a veneer or wood-based panel comprises the following steps: Detecting the unevenness in the surface of the veneer or wood-based panel, and inserting material into the unevenness that is recessed behind the surface, whereby the insertion of material is carried out using a matrix printer.

[0006] The invention relates to veneer or wood-based panels. A veneer panel comprises a substrate and a veneer applied to a surface of the substrate. The veneer is usually wood veneer. A wood-based panel is a solid wood panel, a plywood panel, a particleboard, or a fiberboard.

[0007] Detecting surface irregularities on a veneer or wood-based panel (hereinafter also referred to collectively as a panel) is typically done using a scanner that captures the surface of the panel and its irregularities. Irregularities are areas that deviate from the plane of the surface of the veneer or wood-based panel, particularly in depth, meaning they are recessed behind the surface. The scanning process captures the length, width, and depth of each irregularity, with length and width lying within the plane of the surface of the veneer or wood-based panel. Scanning can be performed using any method; however, the use of a stripe-image scanner has proven particularly suitable. This scanner scans a panel section by section and transmits the captured signals related to the irregularities to a control unit, which stores these signals as a data set specific to the scanned panel.This captures the irregularities of a panel. The data set is preferably created for a specific panel. According to a further development of the invention, the panel is marked so that detectors on subsequent processing and finishing devices can recognize the panel and access the data set of the control unit. This allows, for example, the detection of irregularities even after they have been filled, whether in connection with the application of a coating, a decoration, or a structure, or in connection with dividing the panel into smaller units, e.g., panels. The control unit can be equipped with limit values ​​for filling irregularities, which define a minimum depth, a minimum length, and / or a minimum width that must be met for the irregularity to be filled. Preferably, the limit values ​​are freely selectable.

[0008] Optionally, the data set can also be used to control a preparation tool that prepares the unevenness for filling, e.g., a milling cutter that removes loose fibers from the edge of the unevenness, or a drill that eliminates undercuts so that no cavities without filler material are created, or that enlarges small unevennesses so that the dot matrix printer can fill them correctly.

[0009] According to the invention, material is introduced into the recess behind the surface of the plate by using a matrix printer, in particular a 3D printer. The matrix printer is controlled by the control unit. The control is such that the matrix printer introduces material into the recess until a predetermined level of material is reached, which is usually approximately flush with the surface of the plate. The matrix printer is able to precisely introduce and fill the recess. In particular, the matrix printer is able to introduce the material so precisely into the recess that a flat surface is created which no longer needs to be sanded. This eliminates the effort required for manual work and subsequent processing of the recess.At the same time, the simple and economical elimination of unevenness now makes it interesting to produce less valuable panels, especially wood-based panels with higher-quality, smooth surfaces, by filling in unevenness, thereby achieving higher added value.

[0010] In an advantageous embodiment of the method, material is applied layer by layer, with a first and at least one second layer. This allows the unevenness to be filled precisely and completely. The thickness of a layer of material within the unevenness can be 0.01 mm to 1 mm, advantageously 0.05 mm to 0.5 mm, and particularly 0.1 mm to 0.25 mm. The matrix printer particularly advantageously operates according to the stereolithography process, in which the applied material is cured immediately after application, at least partially, and preferably completely. This allows a decoration, a texture, and / or a sealant to be applied to the material filling the unevenness immediately afterward and without delay. The method according to the invention, which avoids or eliminates the need for filler, avoids manual labor and thus opens a way to quickly and mechanically fill unevenness.Additionally, because of the even application, especially when applying filler in layers, it is unnecessary to grind the filler applied to the uneven surface.

[0011] Further advantageous aspects of backfilling are described below.

[0012] According to a preferred embodiment of the invention, the introduction of material into a layer can also be carried out section by section. This can be used in particular when colored material, which differs in color from the underlying material, is applied section by section to the surface of the filled irregularity, especially in the visible area of ​​the surface of the filled irregularity, in order to create a decoration that corresponds to the decoration of the surrounding panel surface or to create a structure that rises above the surface of the filled irregularity to correspond to the structure of the surrounding panel surface.

[0013] Accordingly, another embodiment of the invention provides that a first and at least one second material, different from the first material, are introduced into the unevenness that is recessed behind the surface of the veneer or wood-based panel. The use of two or more materials makes it possible to produce a higher quality and more aesthetically pleasing filling of the unevenness. The term "material" in the context of this invention is understood to encompass all materials that are introduced into or applied to the unevenness or to the filling material. For example, according to a preferred embodiment, a primer is introduced into the unevenness as the first material to ensure optimal adhesion of a second material, e.g., a filler material, to or into the unevenness. Typical primers are, for example, compounds based on isocyanates.Advantageous embodiments of the invention provide for the use of various filler materials, e.g., uncolored filler material inside the infill within the irregularity, colored filler material on the surface of the infill within the irregularity, or alternatively, a top layer can be applied by the matrix printer, which is color-matched to the surrounding plate surface or which has special performance characteristics, e.g., special abrasion resistance. Further materials that are incorporated into the irregularity are explained in more detail below.

[0014] A further preferred embodiment of the invention provides for the use of two or more matrix printers for filling a void. In a simple embodiment of the method according to the invention, a single matrix printer can process different materials sequentially. However, particularly when two or more different materials are to be used to fill a void in a veneer or wood-based panel, it proves advantageous to use two matrix printers, or alternatively, one matrix printer for each material. The two or more matrix printers can, for example, be arranged sequentially. Since the control unit makes it possible to uniquely identify each void on each panel, it is straightforward to divide the filling of a void into individual steps and to use two or more matrix printers to fill a void sequentially.According to a preferred embodiment of the invention, the control unit detects for each unevenness how far a matrix printer has filled this unevenness, so that it can be determined for a subsequent matrix printer where this subsequent matrix printer continues to fill the already partially filled unevenness.

[0015] As previously explained, a dot matrix printer can deposit various materials into the uneven surface. According to a preferred embodiment of the invention, these various materials can, for example, each comprise at least a stain, a primer, a filler, a base coat, a decorative material, a sealant, a texture-forming material, an oil, and / or a varnish, each of which is deposited individually or in combination with one another in a first and at least one second layer into the uneven surface. As described above, the primer is used to improve the bond of, for example, the filler material to the veneer or the wood-based material of the respective panel. A primer can also be used to bond the aforementioned different layers or materials to one another. The filler material is intended to fill the volume of the uneven surface. Typical filler materials are listed below.A primer is typically applied over the filler material. The primer is usually tinted to match the surface of the veneer or engineered wood panel surrounding the unevenness. Apart from the color or pigmentation, it can be made of the same material as the filler. The decorative material is usually applied as a layer in sections and is a different color than the primer or filler. It is used to create a decorative finish that blends the unevenness with the surrounding surface of the veneer or engineered wood panel, making it indistinguishable from the surrounding surface. To protect the decorative material, primer, or filler from wear, a sealant, such as a lacquer or resin, can be applied. The sealant is not opaque.It is transparent, either completely transparent or tinted, but still transparent enough to allow an underlying filler, primer, or decorative material to remain visible. The sealant may contain additives, in particular hard particles for abrasion resistance or to increase scratch resistance. Furthermore, a texture-forming material, e.g., a varnish, especially a UV- or radiation-curing varnish, may be applied, either as a layer applied in sections to adapt the surface of the irregularity to the surrounding surface by means of raised structures, or as a layer into which structures are introduced by subsequent embossing, also to adapt to the surrounding surface. According to an alternative embodiment of the invention, a varnish may be applied to the filler, primer, decorative material, sealant, and / or texture-forming material, e.g.,to match the gloss level of the surface of the unevenness to the surrounding surface of the panel or to create deliberate differences. UV- or radiation-curing lacquers are preferably used here as well. As an alternative to lacquer, an oil can also be used to treat the surface of the filled unevenness, preferably an air-curing or radiation-curing oil. Where it is stated that the materials used are introduced into the unevenness, this term refers to any application or introduction of material in the area of ​​the unevenness, regardless of whether the unevenness is completely filled, i.e., up to the outer surface of the veneer or wood-based panel, or whether the surface of the filling remains below this surface or extends beyond it.

[0016] The volume of the unevenness to be filled is generally primarily filled with filler material. Any 3D-printable material can be used as filler. The bond between the chosen material and the veneer or wood-based material can be optimized, if necessary, by using a primer. Suitable filler materials include thermoplastic materials such as polyamide, TPU (thermoplastic polyurethane), PLA (polylactic acid), ABS (acrylonitrile butadiene styrene copolymer), PVAc (polyvinyl acetate), PETG (glycol-polymerized polyethylene terephthalate), HIPS (high-impact polystyrene), wood filament, etc.

[0017] Thermoplastic filler materials can also be used, which require drying or curing after being placed into the cavity. Examples include acrylate, epoxy, or vinyl ester compounds, particularly their monomers or oligomers. For filler materials that require drying or curing after filling the cavity, this can occur during or after the filling process. Layered application is advantageous here as well, because filler material applied in a single layer can be dried or cured quickly and completely without interrupting the production process. Drying or curing can be achieved by cooling or by cross-linking using UV radiation or electron beam curing.

[0018] According to a preferred embodiment of the invention, additives such as color pigments, metal pigments, reinforcing fibers, conductivity-enhancing particles, adhesion promoters, nanoparticles, glass beads, etc., can be mixed into the filler material, either individually or in combination. Adding additives to the filler material is particularly advantageous when no primer or similar is used, so that the filler material either remains completely visible or is still partially visible because, for example, decorative or structural material is applied to the filler material in sections. Additives to the filler material can also be used to detect filled irregularities during subsequent processing or finishing operations, even independently of the control unit. Sensors could, for example, detect metal pigments or conductivity-enhancing particles, but also particles added specifically for marking the irregularity, such as...Detect magnetic particles that are not visible in the vicinity of the filled irregularity.

[0019] If a material is used to fill the unevenness that is difficult or impossible to apply with a 3D printer, then, according to an advantageous further development of the invention, at least one additional tool is used to introduce the material into the unevenness. Typically, this is, for example, another matrix printer, in particular an inkjet printer, with which a primer or varnish, but also decorative or structural material or oil, can be applied. Alternatively, it can also be a spray or spreading device that introduces one or more of the aforementioned materials into the unevenness. It is further preferred if the matrix printer is equipped with means for drying and / or curing the applied material.These drying and / or curing devices need not be part of the dot matrix printer itself; however, they are arranged in such a way that they at least partially dry and / or cure one or more of the previously applied layers of material. The drying and / or curing devices, particularly of one of the aforementioned materials, can be, for example, UV lamps, IR lamps, or hot or cold air blowers.

[0020] In areas of unevenness, the surrounding surface of the veneer or wood-based panel is often discolored, or the surface of the panel exhibits a different decor or structure in the vicinity of the defect. It is particularly preferred if the top surface of the infill in the uneven area is matched to the surrounding surface of the veneer or wood-based panel. According to one embodiment of the invention, this can be achieved by color matching the surface of the panel surrounding the unevenness, dyeing, bleaching, or staining it. The application of dye, bleach, or stain can be carried out using methods known per se. Color matching preferably has a gradient from the top surface of the unevenness down to the surface of the panel, where the surface of the panel exhibits its usual color.According to a further advantageous embodiment of the invention, the surface of the veneer or wood-based panel surrounding the unevenness is provided with a decor and / or a structure that creates a transition from the decor or structure of the panel's surface to the decor or structure of the unevenness. In this way, the unevenness becomes virtually invisible. The decor or structure to be applied to the surface surrounding the unevenness can be calculated by the control unit, particularly after prior detection of the decor or structure of the panel's surface by sensors, especially optical sensors. The same applies to the dyeing, decolorizing, or staining of the surface of the veneer or wood-based panel surrounding the unevenness.

[0021] The invention further relates to a veneer or wood-based panel having an unevenness that is filled with a filler material, wherein the filler material is applied in layers. The thickness of a layer of filler material is 0.01 mm to 1 mm, advantageously 0.05 mm to 0.5 mm, advantageously 0.1 mm to 0.25 mm. The panel according to the invention thus differs from known veneer panels because the unevenness is not filled with filler. The filler is not applied to the unevenness in layers, or at least not in such thin layers.

[0022] In a preferred embodiment, the panel according to the invention has a cavity into which a first and at least one second material are filled. The various materials suitable for filling the cavity have already been explained above. A particular advantage of the panel according to the invention is that the cavity can be filled not only with a single, uniform filling material, but that the use of at least two materials makes it possible to produce, in just a few simple steps, a decorative and / or textured, and optionally sealed, surface of the filling that is optimally adapted to the surrounding surface.

[0023] In particular, applying a textured surface proves advantageous when adapting the top surface of the filler to the unevenness. Here, too, a significant advantage of the invention is that sanding the filler material or other materials introduced into the unevenness is unnecessary. Eliminating the sanding process speeds up the filling of the unevenness and allows for immediate not only filling but also finishing, e.g., applying a decorative finish, texture, or sealant.

[0024] Finally, a veneer or wood-based panel is the subject of one embodiment of the invention in which the surface surrounding the unevenness is color-matched to the unevenness as described above. A veneer or wood-based panel in which the decor or structure of the surface surrounding the unevenness is adapted to the structure of the panel's surface as described above is also the subject of an advantageous embodiment of the invention.

[0025] It is expressly noted that the embodiments of the invention described above can be combined with one another depending on the application.

[0026] Details of the invention are explained using exemplary embodiments. These show: Fig. 1 a perspective view of a filled unevenness in a veneer panel in schematic representation; Fig. 2 a schematic representation of a possible layer sequence of a filled unevenness.

[0027] Fig. 1Figure 1 shows a veneer panel 1 with a substrate panel 2 and a veneer 3 arranged on the substrate panel. The following explanations apply equally to wood-based panels, e.g., solid wood panels, plywood panels, particleboard, or fiberboard, which have an unevenness in their surface. The surface of the veneer panel 1 contains an unevenness 4, which extends in depth T to below the plane E in which the surface of the veneer panel lies. The unevenness 4 extends along the length L, width B, and depth T of the veneer panel 1, with length L and width B lying in plane E. The unevenness 4 is filled 5 with a filler material applied in layers 5a-5d. The top surface 6 of the filler material, or the filling 5, lies in plane E; thus, the filling 5 completely fills the unevenness 4 with filler material applied in layers.However, the top surface 6 of the filling 5 can also be located below or above level E.

[0028] Fig. 2Figure 1 shows a veneer panel 1 with an irregularity 4 in the veneer 3, which is filled with a filler 5. The filler 5 has three layers, with the bottom layer 5a resting on the substrate panel, and layers 5b and 5c applied to it. Layers 5a to 5c fill the length and width of the irregularity 4. However, they do not fill the irregularity 4 up to the level E. A primer 7, consisting of filler material colored to match the surface of the veneer 3 surrounding the irregularity 4, is applied to the filler layer 5c. A decorative layer 8, made of a material with a contrasting color to the primer 7, is applied to the primer 7 only in sections. A sealant 9 made of a transparent sealing material containing corundum particles to ensure good abrasion resistance is applied to the decorative layer 8.A structure is applied to the sealant 9, which, although applied in a raised manner, is intended to mimic the pore structure of the veneer 3. The filling 5, which here additionally has layers 7, 8, and 9, fills the unevenness 4 up to level E. The structure 10 protrudes a few µm beyond level E. Example 1:

[0029] An HDF board 2 (dimensions: 2800 x 2070 x 8 mm) is coated on both sides with a veneer 3 (0.5 mm thick, oak veneer on top, beech veneer on the bottom) in a short-cycle press. The veneer is bonded using a melamine-resin-coated overlay. The overlay had a paper weight of 25 g / m² and a final weight with melamine resin of 150 g / m² (VC value: approx. 6.0%). The pressing time was 45 seconds, the pressing temperature was 180°C, and the pressing pressure was 40 bar. Oak veneers 3, exhibiting approximately five defects per square meter, were used to cover the entire top surface of the veneer board 1. Following the application of the veneers 3, the veneer board 1 is passed continuously by a scanner with multiple measuring heads and scanned. All irregularities deeper than 0.1 mm, wider than 1.5 mm, and longer than 4 mm are recorded. All irregularities are saved as a data set using software.The data set is permanently assigned to veneer panel 1 and can be retrieved in all subsequent processing steps. Advantageously, veneer panel 1 has at least one mark that serves as a reference point for aligning tools such as a dot matrix printer or a spray nozzle.

[0030] The veneer sheet 1 is then conveyed to a spraying device, where a liquid primer is applied to the irregularities using a spray head (application rate: 10-15 g primer / m²). The veneer sheet 1 is then conveyed to a matrix printer, in this case a 3D printer. The 3D printer fills the indentations layer by layer with filler material 5. Each layer 5a-5d has a thickness of 0.1 mm. During the filling process, the 3D printer is controlled by a control unit, which ensures that the 3D printer is precisely aligned over the irregularity and that the printer fills the irregularity to the exact depth, width, and length down to level E, i.e., the surface of the veneer 3. A black-dyed polyamide 12 is used as the filler material, which provides the greatest possible color contrast to the surface of the oak veneer surrounding the unevenness.The 3D printer includes means for melting and cooling the polyamide, ensuring that each layer 5a-5d is firmly anchored in the irregularity. The 3D-printed filling process creates a fill 5 with a flat surface that is flush with the surface of the veneer in plane E. The fill seamlessly abuts the surrounding surface in both length and width. The fill aligns with the surface of the veneer 3 in plane E so perfectly that the veneer panel 1 can be further processed and finished immediately after filling, in particular coated or sealed, without the need for sanding the veneer panel 1 with the filled irregularities 5.

[0031] After all irregularities have been filled, the veneer panel 1, covered with oak veneer 3 and including the filled irregularities, is immediately lacquered, making it suitable for use as flooring. Individual planks are produced from the large-format veneer panel 1 in a flooring line and fitted with a continuous profile that allows for glue-free installation. If desired, the control unit, with its stored data on the irregularities, can influence the layout of the veneer panel 1 to ensure optimal distribution of the filled irregularities. Example 2:

[0032] A particleboard 2 (dimensions: 2800 x 2070 x 18 mm) is coated on both sides with a veneer 3 (0.5 mm thick, cherry veneer on the top and bottom) in a short-cycle press. The veneer is bonded using a melamine-impregnated or coated overlay. The overlay had a paper weight of 25 g / m² and a final weight with melamine resin of 150 g / m² (VC value: approx. 6.0%). The pressing time was 45 seconds, the pressing temperature was 180°C, and the pressing pressure was 40 bar. Veneers 3 with approximately 1-3 irregularities 5 per square meter were used on both sides. The irregularities 5 were in particular cracks that had arisen when the veneers 3 were joined together from individual strips or that had subsequently arisen during the manipulation of the assembled veneers 3 on the large-format chipboard 2.

[0033] Following the application of the veneers, the veneer panel 1 is scanned in a continuous process by a scanner with multiple measuring heads, as described in embodiment 1. All irregularities 5 are detected and stored in the control unit using the software. A liquid primer is then applied to the defects using a spray head (application rate: 10–15 g primer / m²). The depressions are then filled layer by layer using a 3D printer. A colored TPU (thermoplastic polyurethane) was used as the filler material. This filler material was color-matched to the oak veneer to minimize the color contrast between the repaired / filled areas and the oak veneer surface. After the various defects were repaired, the oak veneer was coated with a lacquer system that enabled its use as a front panel. Fixed-size front elements were produced from the large-format panel in a production line. Example 3

[0034] The surface of the veneer panel 1 produced according to embodiment 1 is scanned by a scanner and a data record containing all irregularities 4 of a veneer surface of the veneer panel 1 is stored in the control unit.

[0035] To fill a 0.5 mm deep depression, the control unit directs a first 3D printer, which deposits a first layer (5a), a second layer (5b), and a third layer (5c) of a filler material. Each layer (5a to 5c) is 0.1 mm thick. The control unit then directs a second 3D printer, which deposits a 0.1 mm thick layer of a topcoat material colored to match the surrounding veneer surface. The control unit then directs the section-by-section application of a decorative color using an inkjet printer in one or more colors that differ from the topcoat material. This process largely blends the surface of the filled depression with the surrounding veneer surface.

[0036] A 0.1 mm thick layer of UV-curing lacquer is applied to the colored decor using another inkjet printer. The unevenness is now filled to such an extent that the surface of the filled area lies in plane E of the veneer's top surface. The filling process is automated and controlled by the control unit. Manual work and sanding of the filler are eliminated.

[0037] In the above embodiments, a compound based on isocyanates is used as a primer.

[0038] In the preceding exemplary embodiments, the filler material used is a material from the group comprising polyamide, TPU (thermoplastic polyurethane), PLA (polylactic acid), ABS (acrylonitrile butadiene styrene copolymer), PVAc (polyvinyl acetate), PETG (glycol-polymerized polyethylene terephthalate), HIPS (high-impact polystyrene), wood filament, acrylate, epoxy, or vinyl ester compounds, in particular their monomers or oligomers, etc. If an acrylate, epoxy, or vinyl ester compound is used, the matrix printer preferably also includes means for drying or curing. If thermoplastic compounds are used that are processed at high temperatures but solidify at lower temperatures, the matrix printer preferably includes means for cooling.

[0039] Similarly, instead of a veneer panel 1, a wood-based panel can also be processed by scanning irregularities, processing them if necessary, and then filling them as described above in embodiments 1 to 3. Since wood-based panels are often provided with a surface coating on their entire surface (top and / or bottom), it is usually sufficient to introduce filler material into the irregularity. The advantage here is that the introduced filler material does not need to be sanded before applying a coating, because the flat surface of the filler is flush with the plane E of the surface of the wood-based panel.

Claims

1. Method for filling an unevenness (4) in the surface of a veneer or wood-based panel (1) comprising the steps of: - detecting the unevenness (4) in the surface of the veneer or wood-based panel (1), and - introducing material into the unevenness (4) which is recessed behind the surface, wherein the introduction of material is carried out by means of a matrix printer.

2. Method according to claim 1, wherein the material is introduced layer by layer with a first and at least one second layer (5a, 5b, 5c, 5d).

3. Method according to claim 1 or 2, wherein the insertion of material into a layer (5a, 5b, 5c, 5d) is carried out section by section.

4. Method according to any of the preceding claims, wherein a layer (5a, 5b, 5c, 5d) has a thickness of 0.001 mm to 1 mm.

5. Method according to one of the preceding claims, wherein a first material and at least a second material, which differs from the first material, is introduced into the unevenness (4) which is recessed behind the surface of the veneer or wood-based panel (1).

6. Method according to one of the preceding claims, wherein two or more matrix printers are used to insert material into a notch (4).

7. Method according to one of the preceding claims, wherein at least one mordant, one primer, one filler, one base coat, one decorative material, one sealing material, one structuring material, one oil and one varnish are used as materials, each of which is applied individually or in combination in a first and at least one second layer (5a, 5b, 5c, 5d).

8. Method according to one of the preceding claims, wherein the matrix printer is used to apply a structure (10).

9. Method according to one of the preceding claims, wherein means for leveling the wood surface surrounding the unevenness (4), means for introducing a primer and / or means for curing the material introduced into the unevenness (4) are used.

10. Method according to one of the preceding claims, wherein the surface is detected by scanning the surface of the veneer or wood-based panel (1), wherein at least one unevenness (4) is detected with respect to depth, length and width relative to the plane (E) and stored as a data record.

11. Method according to claim 10, characterized by the fact that the data set is used by a control unit to control at least one matrix printer to fill an unevenness (4).

12. Veneer or wood-based panel having an unevenness (4) which is filled with a material, wherein the material is applied in layers.

13. Veneer or wood-based panel (1) according to claim 12, characterized by the fact that a first material and at least a second material are entered into the unevenness (4).

14. Veneer or wood-based panel (1) according to claim 12 or 13, characterized by the fact that the unevenness (4) in the area of ​​the surface of the veneer or wood-based panel (1) has a structure (10).