EP3124193B1 - Method for producing a material board comprising wood particles having reinforced board areas - Google Patents

Description

The invention relates to a method for producing a material board having wood particles with reinforced board areas according to the preamble of claim 1.

In the production of material panels from wood particles, the wood particles are glued, formed into a particle cake by means of a spreader on a corresponding molding unit, compressed and pressed into a panel material in a press. The panel material produced can then be cut into material panels of a size necessary for their intended use, if necessary coated beforehand and provided with appropriate profiles, e.g. locking profiles on the edges, receptacles for fittings and / or functional recesses, such as rows of holes for floor supports. In other words, the material panels produced can be further processed into panels, for example wall, ceiling or floor panels, furniture panels or building panels, among other things. A particularly thick surface coating is from the JP 2001170913 known, which proposes to form a surface coating from a translucent plastic with wood particles. On the other hand, beats JP H06297419 propose to create a decorative surface based on the degree of penetration of different materials. A particle cake is provided with recesses into which particles of a different type are sprinkled so that a subsequent coating can penetrate the respective sections to different depths.

From the document DE 20 2008 018 477 U1 a panel is known which has a particularly resistant surface coating. This is also generated from a separate pressed material mat with decorative particles, corresponding to the actual carrier plate. A similar surface coating is from the DE 10 2005 034 856 A1 known, in which decorative particles are scattered directly onto the surface of the press mat of the carrier plate.

In contrast, the US 2010/0311854 A1 a technical remuneration of panels, which already takes place during the production of the pressed material mat. In this case, replacement particles are scattered in the area of the later locking profiles, which meet the respective requirements such as mechanical reinforcement of the profiles better than the particles of the actual carrier plate.

The material panels are exposed to different levels of external loads depending on their area of application. In addition to various mechanical loads, they also have to withstand climatic fluctuations and direct moisture loads. However, the loads do not occur evenly distributed over the entire material plate, but usually in certain areas typical of the intended use. A wooden component that is particularly protected against biological degradation is, for example, from FR 3031693 known, which discloses the introduction of, for example, copper wire into the surface of wooden components.

Due to their basic structure made of dried wood particles glued together, the material panels are hygroscopic. In humid environments or when moisture is applied directly to the material plate, for example when cleaning the material plate, the material plate can thus swell. Edge areas of the material plate and areas that were subsequently processed are particularly at risk. In the case of coated material panels with profiled side edges, for example, the first swell Edge areas, as the profiling of the edges means that they are largely unprotected against moisture. In the case of furniture panels and building panels, the areas provided for the insertion of fittings or functional elements or the outer edge between the surface and the side edge of the material panel and recesses such as penetrations through the respective panel are particularly at risk from damage from moisture.

In the case of floor panels, it is known to introduce impregnating agents into the area with locking profiles in order to reduce the moisture absorption capacity. The impregnating agents can also improve the strength of the edges in order to make the area of the locking profiles particularly stable.

From the US 2010/0311854 A1 however, it is known to modify the particle cake and to introduce impregnating agents or plastic particles into the particle cake in the later sliced areas of the plate material, ie in the areas of the material plate on which the locking profiles will later be formed.

The invention is based on the object of providing a method for the particularly cost-effective production of a material panel to be used as a furniture panel or building panel which is particularly protected against damage by moisture.

The invention achieves the object by a method with the features of claim 1. Advantageous developments of the invention are specified in the dependent claims. All of the features described, individually or in any combination, are fundamentally the subject matter of the invention, regardless of how they are summarized in the claims or their reference.

The method according to the invention for producing a material panel having wood particles with reinforced panel areas has the following steps: providing a pressed material mat made from glued wood particles, generating recesses arranged in sections in the pressed material mat, with each recess being individually closed and not in direct contact with further recesses and the Recesses are not designed as sections extending continuously over the entire length or width of the material plate, sprinkling of grass particles and / or palm tree particles into the recesses, subsequent pressing of the pressed material mat a panel material, separating the pressed panel material into material panels, with the grass particles and / or palm tree particles being arranged in defined areas of the material panel that may be provided for later processing and positioned in the material panel in the area of ducts or in the area of fittings. The recesses are thus positioned in the pressed material mat with a view to the later use of the material panels produced from the pressed material mat. In this sense, a material plate is understood to be a section of a plate material.

The grass particles and / or palm vegetation particles to be introduced have, compared to the wood particles, not only improved strength properties, but also in particular a significantly lower moisture absorption capacity and swellability, so that due to the grass particles and / or palm vegetation particles, in addition to increased strength, a significant reduction in the swelling capacity of the material panel in the area of the grass particles and / or Palm plant particles is effected. Reinforced panel areas are thus understood to mean sections of a material panel that has a reduced swelling capacity compared to the basic substance (the wood particles) of the material panel.

The method offers the possibility of inexpensively producing material panels which contain wood particles and which, in accordance with their intended use, have particularly low swelling properties in the areas subject to the highest loads. In this way, locking profiles can be formed in panels which are and remain particularly precisely coupled to one another in the interconnected locked state. In addition to the reduced moisture absorption capacity due to the grass particles and / or palm tree particles, the penetration of moisture into the edge area of the individual panels is also made significantly more difficult and the moisture absorption in this area is further reduced.

In the case of furniture panels or building panels, on the other hand, the edge areas exposed to shock loads and the panel sections that receive fittings, for example, can be designed to be particularly stable and moisture-repellent. In addition, plate sections into which recesses and / or passages (holes) can be planned in advance can be better protected against moisture absorption and thus against swelling will.

When using the inventive material panel, for example for furniture or building boards, building boards or furniture components can thus be provided in accordance with the effects described above for panels, which are exactly in the areas (panel sections) in which the highest loads are during use, for example in the Fittings and / or recesses are introduced, have a particularly low moisture absorption capacity.

The material plate thus enables a significant extension of the service life of components made from the material plates, such as, for example, building panels, furniture or panels.

Grass particles and / or palm tree particles can also be introduced and pressed using the existing large-scale industrial processes and machines, so that they can be integrated into the manufacturing process for wood-based panels in a particularly simple and cost-effective manner compared to the known plastic particles. The material panels can also be further processed with conventional tools, in particular milling and / or drilling tools that are common for wood particles, without these having to be matched to the type of particle or an impregnating agent introduced. The grass particles and / or palm plant particles thus considerably extend the service life of the tools.

Grass particles or palm plant particles are understood to mean particles from the, in particular above-ground, stalk of grass plants or particles from the trunk, leaves and / or fruits of palm trees. Wood particles are understood to mean in particular particles from the trunks of perennial plants, i.e. trees. Wood particles in the context of the invention are not particles that are obtained from annual plants.

A pressed material mat is understood to mean a mat produced by means of conventional devices from glued wood particles stacked on top of one another, which are provided for pressing in a press. The wood particles are provided, for example, on a molding unit for conveying the mat of material to be pressed into the press. This can be a continuous press or an index press. The molding unit is adapted to the type of press. The press mat is provided in particular by scattering the wood particles using conventional scattering heads for chips, flakes, strands or fibers.

The recesses in the pressed material mat can be created directly when spreading. The corresponding spreading heads can be designed in such a way that both sections of recesses and / or sections of individual recesses are interspersed over the surface of the pressed material mat and / or recesses arranged in the production direction and / or transversely to the production direction in the pressed material mat. This can be done, for example, by means of anti-scatter devices which are arranged in such a way that no wood particles are scattered by the scattering heads in the areas of the pressed material mat in which the recess is to be created.

Preferably, however, the pressed material mat is produced in the usual way and with a complete surface and the recess is created by removing wood particles from the areas of the pressed material mat provided for the recesses. It can be removed using a suction device. Particularly preferably, the recess is milled out and / or drilled out in the pressed material mat. The recess can accordingly be produced by a drilling, milling or squeegee device which removes the wood particles from the pressed material mat. As a result, a particularly precise creation of the recess is possible both in its position on the press material mat and in its shape. In particular, the height and width of the recess can be produced exactly. The removal of the wood particles to create the recesses takes place, for example, by means of an automatically controlled, preferably by means of a CNC-controlled drilling or milling tool, in order to further increase the precision of the recess position and the recess shape.

A section-wise recess is to be understood as a recess which extends only over a section of the pressed material mat and not over the entire width or length of the pressed material mat. The recesses can be designed individually, that is to say separately, or they can adjoin one another or intersect or overlap. According to the invention, a section-by-section individual recess is thus to be understood as a recess that is separate and in no direct contact with other recesses. The section-wise arrangement as well as the section-wise individual arrangement encompassed by it enables a targeted improvement of sections of the material plate that is limited to a spatially very limited area. Accordingly According to the invention, with a section-by-section or section-by-section individual arrangement of the recesses, the grass particles and / or palm trees in the material plate are not designed as sections extending continuously over the entire length or the entire width of the material plate.

The recesses can, for example, be freely distributed, arranged next to one another, one behind the other and / or offset from one another. Accordingly, they can, for example, also be arranged next to one another or one behind the other along a longitudinal axis direction and / or transverse axis direction of the pressed material mat. The recesses can also have a different shape, size or depth (corresponds to the height of the pressed material mat). Both when producing the pressed material mat by means of wood particles and when introducing the grass particles and / or palm tree particles, the respective particles are glued with a binding agent.

The grass particles and / or palm tree particles are, for example, sprinkled into the recesses. For this purpose, special scattering heads can be arranged in a device which sprinkles the grass particles and / or palm trees in a defined position, in particular into the recesses and with a defined amount.

After the grass particles and / or palm tree particles have been introduced into the recess, the pressed material mat with the grass particles and / or palm tree particles strewn in is pressed to form a panel material. For example, after a normal storage phase for cooling the panel material, it is divided into a large number of sections (material panels), for example sawn. The panel material is separated in such a way that the areas with grass particles and / or palm tree particles are present in the areas of the material panel in which the loads are to be expected in accordance with the planned use of the material panel.

The material panels produced from the panel material correspond at least largely to the later size of the component, for example the size of the later panel, the furniture component or the building board. The creation of the recesses, the introduction of the grass particles and / or palm tree particles and the separation are thus carried out with due consideration the intended use of the material panel.

When using a conventional material board containing wood particles, for example in damp areas, such as outdoors, as a vanity unit or the like, the material board is exposed to increased stress, in this case increased ambient humidity. Even a coating of the main surfaces and side edges does not prevent the usual material panel from swelling in the long term in the edge area. The inventive material panel, on the other hand, can be used, for example, due to the grass particles and / or palm tree particles positioned in the edge area, in the area of recesses and / or passages or in the area of fittings, without further structural processing, i.e. without interfering with the inner structure of the material panel and the Significantly extend the service life of a component made from it.

The material plate can be structurally processed in the area of the grass particles and / or palm trees. That is, in the area of the grass particles and / or palm plant particles, profiling, functional recesses, bores, etc. are carried out in such a way that the grass particles and / or palm plant particles are also present after processing in the area of structural processing or adjacent to this area. Accordingly, the recesses are produced particularly precisely at a predefined position in the mat of material to be pressed. This means that the intended use of the material plate to be produced from the pressed material mat and the associated load areas of the material plate are determined in advance and the recesses in the pressed material mat are positioned on the basis of the predetermined load areas.

In the case of pressed material mats, from which components with reinforced side edges, for example panels with locking profiles, are to be produced, the recesses particularly preferably extend in the production direction and / or transversely to the production direction. The cutting of the panel material produced from the pressed material mats into individual material panels is carried out in the production of material panels for panels, preferably in the area of the grass particles and / or palm tree particles, each material panel containing grass particles and / or palm tree particles in the area of its longitudinal and / or transverse edges.

In the case of panels in particular, the profiling of the edge areas, i.e. the molding of the locking profiles in the area of the grass particles and / or palm trees, can be done particularly and precisely, as a result of which the edge areas have particularly low swelling properties on contact with moisture. In addition, it is ensured that the locking profiles produced have a particularly high strength and thus fit into one another particularly precisely, as a result of which moisture absorption is blocked when the panels are coupled. Panels made of inventive material panels are thus preferably profiled in the area of the longitudinal and / or transverse edges with locking profiles for adhesive-free connection of a plurality of panels.

According to a further development of the invention, the mat of material to be pressed is precompacted before the recesses are produced. For this purpose, the wood particles scattered to form the pressed material mat are pre-pressed, the pressed material mat being compressed from a scattering height to an intermediate height. Here, air escapes from the pressed material mat and, if necessary, the first adhesive connections are created between the glued wood particles. The pre-compression enables a much more precise removal of the wood particles to create the recesses. According to a further development of the invention, the recesses are produced in the area of an upper side and / or in the area of an underside of the pressed material mat. The underside is to be understood as the outside of the wood particle plane that rests on the mold unit. The upper side is the outer side of the pressed material mat opposite the lower side, that is to say the layer of particles scattered last in a scattered production of the pressed material mat. In principle, it is possible that the recesses completely penetrate the pressed material mat, ie the recesses protrude completely through the pressed material mat from the top to the bottom and the grass particles and / or palm tree particles completely fill the recesses. Due to the partial arrangement of the recesses (that is, the not completely penetrating arrangement) in the top and / or the bottom and the filling of the recesses with the grass particles and / or palm tree particles, particularly inexpensive material panels with reinforced areas on both sides, for example opposite one another, can be made having increased strength and low swelling properties. Starting from the surface of the top or bottom, the recesses protrude into the press mat, in particular up to 1/3 of the total height of the press mat

As an alternative to creating a recess on the underside and introducing the grass particles and / or palm vegetation particles into the underside recess, a further development of the invention provides that particle units made of grass particles and / or palm vegetation particles are arranged in defined areas on the forming unit before the press mat is provided . The units can be provided as independent (not in direct contact, i.e., individually arranged in sections or arranged in sections) particle nests and / or as particle strips extending in the production direction and / or transversely to the production direction. The pressed material mat made of wood particles is then arranged on top of the particle units. This means that before the mat of material to be pressed is sprinkled on, particle units comprising grass particles and / or palm tree particles are sprinkled onto the forming unit. The arrangement of the particle units of grass particles and / or palm tree particles is preferably carried out analogously to the recesses to be produced on the upper side, so that the particle units and the recesses in the upper side are, for example, opposite one another. The dimensions of the particle units produced on the underside can largely correspond, for example, to the alternatively produced recesses in the underside or the particle units in the upper side. By sprinkling the pressed material mat made of wood particles onto the particle units, the grass particles and / or palm tree particles are introduced into the underside of the pressed material mat in a particularly simple and inexpensive manner.

The recesses can be produced on the upper side, as already mentioned, for example by removing the wood particles from the finished pressed material mat. In particular, when the pressed material mat is scattered in layers, e.g. as a lower cover layer, middle layer, upper cover layer, it is also possible, for example, after the middle layer has been scattered on top of the middle layer, to sprinkle particle units made of grass particles and / or palm trees. These can, for example, correspond to the scattered particle units on the underside of the pressed material mat. The wood particles belonging to the upper cover layer of the pressed material mat can then be sprinkled onto the particle units scattered on the upper side of the middle layer. The wood particles forming the upper cover layer in particular do not cover the particle units scattered on the top of the middle layer, but are only scattered between or next to the particle units.

According to a further development of the invention, at least one covering layer is applied to an upper side and / or an underside of the panel material. The covering layer can consist of one or a plurality of individual layers and / or plies. For example, for furniture panels and panels with a visible surface, it is common to have a single or multilayer surface covering on the top of the panel material and, if necessary, a single or multilayer surface covering (e.g. a backing layer that is not visible during use or a surface covering that is also visible) on the Apply to the underside of the panel material. The formation of the covering layer is possible with all known and possible methods and types of layers. The covering layer can be designed as a decorative layer, for example as a decorative paper with or without an overlay, a lacquer or synthetic resin layer or as a film coating. In addition to decorative layers (colored decorative layers), the covering layer can also have wear layers against increased abrasion, which contain, for example, corundum or similar minerals and / or also have structural layers that produce a haptic surface. Thus, the covering layer can in particular comprise one or more colored decorative layers for forming a colored decoration, a wear layer against increased mechanical stress and at least one structural layer which has structures (e.g. synchronous pores) that are matched to the colored decoration.

The coating layer is applied in particular after the pressed material mat has been pressed to form a panel material and before the pressed panel material is separated. With the application of the covering layer, further work steps such as for example leveling the surface of the panel material or further steps for pretreating the surfaces of the panel material for applying the covering layer can be carried out. Alternatively, the covering layer can also be applied after the separation and, for example, before the profiling. In the case of furniture panels, for example, it is also possible to apply a corresponding surface covering to the surfaces of the side edges of the material panels after the panel material has been separated.

The particle shape can be designed differently. According to a further development of the invention it is provided that a pressed material mat made of wood fibers is provided. The wood fibers are intended in particular to produce an MDF or HDF board. The recesses are particularly special in the case of a pressed material mat with wood fibers simple and precise to manufacture; in addition, the introduction of the grass particles and / or palm trees into the pressed material mat made of wood fibers is particularly effective due to the increased moisture and swelling properties of wood fibers.

A particular advantage of the inventive method is that, due to the reinforcement of the areas that are most heavily loaded during use by grass particles and / or palm trees, it is possible to reduce the overall density of the pressed material mat or the panel material produced from it, which results in high material savings and thus also Cost saving is effected. In addition, the panel material produced can be made particularly light as a result, so that the transport, handling and use of the material panel, such as, for example, the laying of panels, is also particularly simple.

In order to obtain particularly high strengths and particularly low swelling capacities in the area with grass particles when using grass particles, a further development of the invention provides that bamboo particles are introduced as grass particles. Bamboo particles in particular improve the properties of the reinforced areas of the material board, in particular, for example, panel edges, again considerably and, from the area of grass particles, can also be integrated particularly easily into customary standardized manufacturing processes and processed with customary tools.

For a particularly high strength and a particularly low swellability, a development of the invention provides that grass fibers, palm fibers and / or a mixture of these in particular are introduced into the recess or applied as particle units. The formation of the grass particles and / or palm tree particles as fibers can take place in particular when the wood particles are formed as wood fibers in order to achieve a largely homogeneous structure of the panel material. When the wood particles are formed as shavings, in particular also as shavings for fine chipboard, strands, flakes, etc., the grass particles and / or palm tree particles are advantageously also formed as fibers, in particular bamboo fibers, since this allows the precise shaping of the wood particles despite the coarser structure of the wood particles Particularly precisely fitting profiling, for example locking devices, fitting recesses and / or feedthroughs is made possible. In addition, the training of the Grass particles and / or palm tree particles as fibers achieve a particularly good and secure connection of the introduced grass particles and / or palm tree particles to the pressed material mat made of wood particles. Especially to reduce the water absorption capacity and the swelling capacity, bamboo fibers are introduced as grass fibers, as these surprisingly bring about a considerable improvement.

The grass particles and / or palm trees can be scattered loosely. In order to further reduce the swelling capacity of the areas with grass particles and / or palm tree particles and to further increase the strength, a further development of the invention provides that the grass particles and / or palm tree particles are introduced with a greater density than the wood particles or are provided in particle units. This means that the grass particles and / or palm tree particles are, for example, scattered over, i.e. with a larger amount than the amount of wood particles removed. The scattered amount can either be drawn off by means of a roller or a sliding plate, but preferably compacted in the recess.

The introduced and / or provided grass particles and / or palm vegetation particles can thus have an increased density compared to the wood particles. Compared to the wood particles, the bulk density of the grass particles and / or palm tree particles can in particular also be increased and / or the particle size of the grass particles and / or palm tree particles is smaller.

After pressing, particularly high densities are created in the panel material in the area of the grass particles and / or palm tree particles, which enables the particularly precise and stable processing of profiles, functional recesses, holes, etc., for example the locking profiles, and also lowers the swelling properties in the reinforced areas is. In addition, the overall density of the panel material can be further reduced, since the areas of the material panels that are important for the load that occur are particularly strong and swell-proof. In contrast, the remaining area of the material panel (the wood particles) can have a particularly low density and can thus be designed to be particularly light.

To further increase the strength of the reinforced areas of the material panels and to According to a further development of the invention, a further reduction in the swelling capacity of these areas is provided for the grass particles and / or palm trees to be glued with an isocyanate. As already mentioned above, the grass particles and / or palm tree particles are wetted with an adhesive when they are introduced. When using isocyanate as an adhesive, in addition to the advantages mentioned, a particularly secure and stable connection of the grass particles and / or palm tree particles to the wood particles is guaranteed.

The invention further solves the problem by a material panel according to claim 14 produced according to the method described above. The inventive material panel is thus a panel material with pressed wood particles, in which there are sections with grass particles and / or palm tree particles and which are used in particular for the production of furniture components and / or construction panels is formed.

Ultimately, in addition to the production of material panels for furniture components and building panels, the method is also particularly suitable for producing a panel with reinforced edge areas at least comprising: a material panel containing wood particles, locking profiles on the transverse and / or longitudinal sides of the material panel for the adhesive-free locking of several panels to one another, whereby in the area of the transverse and / or longitudinal edges, grass particles and / or palm tree particles are arranged to form reinforced edge areas of the panel.

The formation of the transverse and / or longitudinal edges with grass particles and / or palm tree particles enables the panels to have high mechanical strength in the area of the side edges, the swelling ability of the side edges under the influence of moisture is particularly low and the accuracy of fit of the locking profiles is particularly precise, which means that Penetration of moisture is also prevented. In addition, the areas of the panel with wood particles can have a particularly low density compared to conventional panels, since the panel is sufficiently stable in the stressed areas due to the increased strength due to the grass particles and / or palm tree particles.

As already mentioned in connection with the method, the panel or the Material plate also have a covering coating according to the type described in connection with the method. The grass particles and / or palm tree particles or the wood particles can also be embodied in particular fiber-like and the grass particles are embodied in particular as bamboo particles, for example as bamboo fibers.

Although some aspects have been described in connection with or as a method step, it is understood that these aspects also correspond to a description of a corresponding block, detail or feature of the panel or the material plate. Analogously to this, all aspects that have been described in connection with the panel or the material plate also represent a description of the corresponding method or a corresponding method step or one which is to be understood as a feature of the method step.

Fig. 1

schematisch in einem perspektivischen Querschnitt einen Ausschnitt aus einer Pressgutmatte zum Herstellen eines Plattenwerkstoffes mit Ausnehmungen in der Unterseite und der Oberseite der Pressgutmatte;

Fig. 2

ein erfindungsgemäßes Paneel mit in die Oberseite und Unterseite eingebrachten Ausnehmungen und in die Ausnehmungen eingebrachten Graspartikeln;

Fig. 3

schematisch in einer perspektivischen Ansicht einen Ausschnitt aus einer vorverdichteten Pressgutmatte mit abschnittsweise und abschnittsweise einzeln angeordneten Ausnehmungen.

The invention is described in more detail below using an exemplary embodiment. It shows:

Fig. 1

schematically, in a perspective cross-section, a detail from a pressed material mat for producing a panel material with recesses in the underside and the top of the pressed material mat;

Fig. 2

a panel according to the invention with recesses made in the top and bottom and grass particles made in the recesses;

Fig. 3

schematically, in a perspective view, a section of a pre-compacted pressed material mat with recesses arranged individually in sections and sections.

Fig. 1 shows a pressed material mat 11 made of wood particles 9, here wood fibers (represented by dots). The press mat 11 rests with its lower layer 7 on a press belt 12 of a continuous press (not shown here). On its upper side 6, the pressed material mat 11 has two recesses 8 extending lengthwise next to one another in the direction of production and one recess 13 extending transversely to the direction of production. In the underside 7 opposite the upper side 6, exactly congruent and exactly opposite to the recesses 8, 13 particle units 10, here particle strips made of grass particles 5, here bamboo fibers (shown in dashed lines), are congruent, ie to the Recesses 8, 13 are arranged. The wood particles 9 were scattered onto the particle units 10. The height H _{1 of} the particle units 10 and the height H2 of the recesses 8, 13, starting from the upper side 6 and the lower side 7, are in each case ¼ of the total height H _{tot of} the pressed material mat 11. In particular, depending on the intended use, the particle units (10) and / or the recesses (8, 13) can alternatively also be arranged as partially arranged particle nests and / or recesses arranged in sections over the surface of the pressed material mat (11).

To produce a pressable mat of pressed material 11, grass particles 5, here likewise bamboo fibers (not shown), are then sprinkled into the recesses 8, 13. The grass particles 5 in the recesses 8, 13 or the particle units 10 are glued with a binding agent based on isocyanate in order to achieve a particularly good binding of the grass particles 5 to the wood particles 9. In addition, the scattered density of the grass particles 5 is approx. 20% higher than the scattered density of the wood particles 9, so that in the later pressed panel material the areas with grass particles 5 have a higher density than the areas of the wood fibers 9.

As an alternative to the grass particles 5, it is also possible, for example, to use palm tree particles or a mixture of grass particles 5 and palm tree particles.

Both the particle units 10 (particle strips) and recesses 8, 13 extending transversely as well as longitudinally to the production direction L are arranged largely precisely congruent to one another on the top and bottom 6, 7 of the pressed material mat 11.

After the recesses 8, 13, which extend in the production direction L and transversely to the production direction Q, have been filled with grass particles 5, the finished pressed material mat 11 is transferred to a press and there pressed to form a panel material. The panel material is later separated in the area of the recesses 8, 13 or particle units 10, so that each material panel 2 produced (see FIG Fig. 2 ) contains grass particles 5 in their outer edge areas (longitudinal and front sides).

Fig. 2 shows in cross section a panel 1 according to the invention with a material plate 2 made of wood particles 9 (not shown here), here made of wood fibers. Alternatively, for example Wood chips, wood flakes or wood strands can be used.

On the longitudinal edges 3a, 3b in the area of the top and bottom sides 6, 7 of the material plate 2, grass particles 5, here bamboo fibers, are arranged in each case in the area of the locking profiles 4a, 4b. During the production of the material plate 2, the grass particles 5 were scattered into the recesses 8, 13 in the pressed material mat 11 (upper side 6) or provided as particle units 10 (lower side 7) and pressed together with the pressed material mat 11 (see FIG Fig. 1 ). The grass particles 5 are formed in the material plate 2 up to a thickness D ₂ of one third of the total thickness D ₁ (shown by arrows), each starting from the upper side 6 and the lower side 7.

The density of the grass particles 5, here the bamboo fibers 5, is approximately 20% higher than the density of the wood particles 9 in the material panel 2.

Fig. 3 shows schematically in a perspective representation a section of an already pre-compressed mat of pressed material 11. The pressed material mat 11 is moved in the transport direction A (shown by an arrow). In the pre-compressed mat of pressed material 11, recesses 15 and individual recesses 14, 14a in sections were made. Then bamboo fibers 16 were scattered over into the recesses 14, 14a, 15 and compacted in the recesses 14, 14a, 15 by means of a roller. The pressed material mat 11 is designed to produce a three-layer chipboard. Alternatively, for example, a pressed material mat can also be used to produce a fiberboard.

The recesses 15, which are arranged in sections, and the recesses 14, 14 a, which are individually arranged in sections, are each made in regions of the pressed material mat 11 that have been defined in advance. After pressing the pressed material mat 11 and cutting it open to form a material plate, the recesses with the bamboo fibers in the respective material plate are in precisely defined sections.

The recesses 14, 14a, which are individually arranged in sections, were designed here as round bores or as oval recesses 14a. The recesses 15 arranged in sections are here cross-like as overlapping elongated recesses 15 arranged. The round bores were made by means of a drill and the oval and slot-like recesses 14a, 15 by means of a milling tool. The round bores penetrate the pressed material mat 11 completely, while the oval recesses 14a only pass through the pressed material mat 11 to 2/3 of its height H _before . The cross-like arranged recesses 15 are, however, only formed up to a press mat depth of 1/3 of the press mat height H _before .

As shown, the arrangement of the recesses 14, 14a, which are individually arranged in sections, and the recesses 15, which are arranged in sections, are repeated regularly.

List of reference symbols

1

Panel

2

Material plate

3a, 3b

Longitudinal edges

4a, 4b

Locking profiles

5

Grass particles

6th

Top

7th

bottom

8th

Longitudinal recesses

9

Wood particles

10

Particle units

11

Press mat

12

Press belt

13

Recesses across

14th

individual recesses in sections

15th

recesses in sections

D ₁

Thick panel

D2

Thick grass particles and / or palm trees

H _tot2

Height of press mat

H _before

Height of pre-compressed material mat

H ₁

Height of particle streaks

H2

Height recesses

L.

Longitudinal direction of production

Q

Direction of production across

Claims (13)

1. A method for producing a material board (2) comprising wood particles having reinforced areas, which has the steps of:

   - providing a pressed material mat (11) made of glued wood particles (9),

   - producing recesses (8, 13, 14, 15) arranged in sections in the pressed material mat (11), wherein each recess is individually and separately self-contained and is not in direct contact with further recesses and the recesses are not configured as portions extending continuously over the entire length or width of the material board, characterized by the steps of:

   - sprinkling grass particles (5) and/or palm species particles into the recesses (8, 13, 14, 15),

   - subsequently compacting the pressed material mat (11) into a board material,

   - separating the compacted board material into material boards (2), wherein the grass particles and/or palm species particles (5) are arranged in defined areas of the material board (2) and are positioned in the material board in the area of through holes or in the area of fittings.
2. The method according to claim 1, characterized in that the pressed material mat (11) is pre-compacted prior to the production of the recesses (8, 13, 14, 15).
3. The method according to one of the preceding claims, characterized in that the recesses (8, 13, 14, 15) arranged in sections are arranged distributed over the surface of the pressed material mat (11).
4. The method according to one of the preceding claims, characterized in that the recesses (8, 13, 14, 15) arranged in sections are produced in the area of an upper side (6) and/or in the area of an underside (7) of the pressed material mat (11).
5. The method according to one of the preceding claims, characterized in that prior to providing the pressed material mat (11) at least one particle unit (10) made of grass particles (5) and/or palm species particles (5) are provided and the pressed material mat (11) made of wood particles (9) is subsequently arranged above the particle unit (10).
6. The method according to one of the preceding claims, characterized in that the recesses (8, 13, 14, 15) are produced by removing wood particles (9) from the pressed material mat (11) in sections.
7. The method according to one of the preceding claims, characterized in that the recesses (8, 13,14,15) in the pressed material mat are milled out and/or drilled out.
8. The method according to one of the preceding claims, characterized in that a coating layer is applied to an upper side (6) and/or an underside (7) of the board material.
9. The method according to one of the preceding claims, characterized in that the pressed material mat (11) is provided of wood fibers.
10. The method according to one of the preceding claims, characterized in that bamboo particles, in particular bamboo fibers, are introduced as grass particles (5).
11. The method according to one of the preceding claims, characterized in that in particular grass fibers, palm species fibers or a mixture of these is/are introduced into the recesses (8, 13, 14, 15) or is/are provided as a particle unit (10).
12. The method according to one of the preceding claims, characterized in that the grass particles (5) and/or palm species particles having a greater density compared with the wood particles (9) are introduced or are provided as particle units (10).
13. The method according to one of the preceding claims, characterized in that the grass particles and/or palm species particles (5) are glued with an isocyanate.

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