Method for producing a stabilized veneer, and stabilized veneer

Abstract

The invention relates to a method for producing a stabilized veneer without a support panel, to a stabilized veneer, and to a veneered panel. The aim of the invention is to provide a method for producing a veneer and a veneer, wherein the veneer is particularly stable and has a particularly high degree of mechanical stability with respect to pressure loads in particular, can be easily and reliably processed as an intermediate product, has a particularly small veneer thickness and is thus particularly inexpensive to produce, and still has a good real wood appearance and haptics. This is achieved in that the method for producing a stabilized and / or rollable veneer without a support panel has, as steps, first the step of providing a stabilization layer, followed by the step of coating one face, in particular the upper face, of the stabilization layer with a condensation resin, and then a step of pressing the stabilization layer and the veneer layer in order to form a stabilization ply by means of the condensation resin, wherein the condensation resin is at least partly pressed out of the stabilization layer and into the veneer layer during the pressing process, leading to a solidification or mechanical stabilization of the veneer therein.

Description

[0001] Description

[0002] METHOD FOR PRODUCING A STABILIZED VENEER

[0003] AS WELL AS STABILIZED VENEER

[0004] The invention relates to a method for producing a stabilized veneer without a carrier plate, a stabilized veneer without a carrier plate and a veneered plate.

[0005] When manufacturing products for a wide variety of applications in interior design, furniture, and flooring, real wood surfaces are considered the highest quality option. However, the use of solid wood leads to high product costs and complex production. Furthermore, the availability of the required quantities of wood, including wood in the required format, is often limited.

[0006] To provide customers with products with a real wood surface, veneers have long been used. However, veneers have the problem that they tend to break during processing at thicknesses of less than one millimeter, making them difficult to process. This often leads to material loss and associated additional costs. Another problem is that such veneers are also very susceptible to mechanical damage due to their thinness.

[0007] These problems become more serious the larger the veneers are. This is also due to the fact that large-format veneers are composed of smaller veneer sections. These veneer sections are typically glued together at the narrow edges before use and sometimes stabilized by a glue thread on the back of the veneer sheet.

[0008] A known prior art solution for improving the processability of a large-format veneer sheet is to adhere a stabilizing layer to the back, as described, for example, in EP 1911580 Ai. However, this still does not improve the veneer's resistance to localized compressive stresses during processing or later use, as the adhesive does not penetrate the veneer layer. Furthermore, the fundamental problem still exists that thin, large-format veneer sheets are difficult to handle without causing damage. Such damage, for example, during production and processing, can only be avoided with expensive technical solutions, and even then, there is a high scrap rate, which significantly increases production costs and ultimately the product price.

[0009] Another state-of-the-art solution for improving stability and, in particular, resistance to mechanical stress is the application of a thick layer of varnish to the veneer surface. However, customers require surfaces whose wood appearance is as unaltered as possible, so the veneer can only be surface-treated with small amounts of varnish or oil. While this provides protection against soiling and fading, it does not protect against compressive stress. However, this is a major problem, especially for floors and other surfaces subject to high mechanical stress, and can currently only be solved by using thicker veneers.

[0010] The invention is therefore based on the technical object of providing a method for producing a veneer and a veneer, wherein the veneer is particularly stable without a carrier plate and in particular has a particularly high mechanical stability against compressive loads, can be easily and safely processed as an intermediate product, has a particularly low veneer thickness and is therefore particularly inexpensive to produce and still has a good real wood look and feel.

[0011] The object is achieved according to the invention by a method for producing a stabilized veneer according to claim 1, a stabilized veneer according to claim 13, and a veneered panel according to claim 14. Advantageous developments of the invention are specified in the dependent claims.

[0012] The method according to the invention for producing a stabilized and / or rollable veneer without a carrier plate and / or as an independent product comprises the following method steps: firstly providing a stabilizing layer, followed by coating one side, in particular a top side, of the stabilizing layer with a condensation resin, and then pressing the stabilizing layer and the veneer layer to form a stabilizing layer by means of the condensation resin, wherein the condensation resin is pressed at least partially from the stabilizing layer into the veneer layer during pressing and leads there to a solidification or mechanical stabilization of the veneer.

[0013] Furthermore, the invention relates to a stabilized veneer without a carrier plate and / or as a stand-alone product, in particular produced according to the method according to the invention, which has a stabilizing layer pressed onto a back side of the veneer layer and a stabilizing layer extending continuously from the stabilizing layer into the back side of the veneer layer and made of a condensation resin pressed from the stabilizing layer into the veneer layer.

[0014] Finally, the invention relates to a veneered panel comprising a carrier plate and a stabilized veneer according to the invention arranged above the carrier plate.

[0015] The inventors have recognized that by incorporating a condensation resin into the back of the veneer layer by means of a stabilizing layer, mechanical stabilization of the veneer can be achieved, particularly against compressive stresses. Furthermore, by using a stabilizing layer in combination with the targeted introduction of the condensation resin, a stabilizing layer extending over the stabilizing layer into the veneer layer can be formed, which leads to a significant improvement in the mechanical properties and processability of the insulated veneer. This makes it possible to use a particularly thin veneer layer and thus keep the production and product costs of the stabilized veneer low.Finally, the front side and thus the wood surface of the stabilized veneer remains unchanged and natural due to the condensation resin being pressed into the veneer layer from the back, thus achieving an unchanged wood surface appearance and feel. Furthermore, the inventive solution increases the variability of processing, since the stabilized veneer is typically rollable and can therefore be stored, used, and further processed as a roll.

[0016] The stabilized veneer according to the invention is accordingly a laminated material or a composite material formed from at least two layers, the veneer layer and the stabilizing layer. These two layers are preferably inseparably bonded to one another in the finished veneer. Furthermore, the veneer according to the invention is produced without a carrier board and / or as a standalone product and / or independently of subsequent attachment to any surface.

[0017] According to the invention, the stabilized veneer does not have a carrier plate. A carrier plate is understood to be the solid surface or a component with a solid surface that is to be modified by the application of the veneer. In particular, a stabilized veneer without a carrier plate is not a veneered furniture panel, a veneered floor panel, a veneered wall panel, or a veneered ceiling panel. Furthermore, the stabilized veneer preferably comprises exclusively the veneer layer and a stabilizing layer as layers or material layers. In principle, however, further layers or plies, in particular transparent layers, such as a lacquer coating, can be provided on the veneer layer.

[0018] The stabilized veneer according to the invention is still a veneer for applying and finishing a material surface and not a surface of another object already provided with a veneer. Accordingly, the stabilized veneer is a standalone product that is manufactured individually and can be stored and handled independently of a carrier or carrier plate and, in particular, does not need to be directly stabilized by a carrier plate. This represents a significant advantage of the invention, since previously corresponding veneers bonded to a stabilizing layer were always simultaneously bonded to a carrier plate, thus making the veneer unavailable as a standalone product for further applications. Thus, the stabilized veneer is designed to be arranged on a surface and bonded thereto in order to modify the surface.The stabilizing layer preferably extends over the entire surface of the stabilized veneer and / or has a substantially uniform thickness over the entire surface. Furthermore, the stabilizing layer preferably has a uniform composition and / or the same mechanical properties over the entire surface. Likewise preferably, the stabilizing layer is bendable, rollable and / or flexible. Furthermore, the stabilizing layer is preferably not formed from wood and / or a wood-based material. Particularly preferably, the stabilizing layer is provided exclusively for stabilizing the veneer and, in particular, does not form a structure of a piece of furniture, a furniture board, another board material or a panel, in particular for arrangement on the ceiling, a wall and / or the floor.

[0019] The stabilizing layer is designed for single-sided coating with a condensation resin, wherein the stabilizing layer is preferably formed such that the condensation resin applied to the surface of the stabilizing layer can at least partially penetrate into the stabilizing layer. Single-sided coating can be performed in any manner. The condensation resin can be applied immediately before further use, or it can be applied and subsequently saturated into the stabilizing layer. The coating can be performed using a liquid condensation resin or by any method of applying a solid.

[0020] Alternatively, however, the stabilizing layer can also be formed in such a way that hardly any or no condensation resin can penetrate, so that the coating preferably involves an exclusively superficial application of the condensation resin and, particularly preferably, the condensation resin cannot subsequently penetrate and / or soak into the stabilizing layer. Although any appropriately liquid-resistant or liquid-impermeable stabilizing layer can be used for this purpose, the use of parchment paper is particularly preferred for this purpose. A likewise particularly preferred embodiment further provides for the use of a biocomposite material based on cellulose, and in particular vulcanized fiber or Vulkament, as the stabilizing layer. This advantageously results in a biocomposite material with a veneer layer, in particular with a real wood veneer surface.Preferably, however, the coating is carried out as a liquid coating, in particular directly onto the surface of the stabilizing layer. Furthermore, it is preferred that the rear side of the stabilizing layer, i.e. the surface of the stabilizing layer facing away from the veneer layer, does not have a coating of condensation resin and / or no external layer formed exclusively from condensation resin during the production of the stabilized veneer and / or in the stabilized veneer. Accordingly, a preferred embodiment of the method according to the invention provides that a side of the stabilizing layer opposite the coated side is free of a coating of the condensation resin. Likewise, the underside of the stabilizing layer is preferably not provided with any synthetic resin and / or with any adhesive, at least before and / or during pressing.

[0021] According to the invention, the stabilizing layer is arranged on the back of a veneer layer and pressed therewith. The back of a veneer layer is preferably the side of the veneer layer that lies opposite the surface of the finished, stabilized veneer. Accordingly, the front of the veneer layer is intended to form the surface of the stabilized veneer and / or to remain visible. The veneer layer is preferably a layer of real wood, which can in principle initially have any desired thickness, although thicknesses between 0.5 mm and 10 mm are generally common for veneers. However, due to the stabilization with the condensation resin, significantly thinner layer thicknesses are possible. The veneer can be produced in one piece from a log by slicing or peeling. However, it can also be assembled from individual pieces that are connected to one another, for example, by binding agents or so-called glue threads.The veneer preferably has essentially the dimensions of the stabilizing layer.

[0022] According to the invention, the stabilizing layer and the veneer layer are joined to produce the stabilized veneer by pressing, whereby the pressing can in principle be carried out statically or dynamically. In any case, according to the invention, the pressing results in at least a portion of the condensation resin being pressed from the stabilizing layer or from the surface of the stabilizing layer into the veneer layer. This is preferably achieved by liquefying the synthetic resin in the press under the influence of elevated temperature and elevated pressure, and subsequently chemically curing it and / or solidifying upon cooling. The pressing time is typically between 20 seconds and 60 seconds. The veneer layer preferably has cavities, in particular cracks or gaps caused by production and / or cavities typical of wood, e.g. due to cut vessels. The condensation resin then preferably penetrates into at least some of these cavities during pressing.

[0023] According to the invention, the condensation resin penetrating into the veneer layer leads to the formation of a stabilizing layer which extends through the stabilizing layer into the veneer layer and in doing so both connects the stabilizing layer to the veneer layer and also forms a composite material, in particular a penetration composite material, with the material of the veneer layer, which has improved material properties compared to pure wood, for example increased elasticity or flexibility and / or increased mechanical strength and in particular increased compressive strength.

[0024] Finally, to form a veneered board, the invention provides for arranging a stabilized veneer according to the invention on a carrier board and preferably gluing it thereto or bonding it using an adhesive or synthetic resin. In principle, any board that is flat on at least one side and forms a firm bond with an adhesive or synthetic resin can be used as the carrier board. Wood-based panels are preferably used, e.g., medium-density or high-density fiberboard (MDF, HDF), particleboard, OSB (Oriented Strand Board), solid wood panels, plywood, and block or strip boards. Cement-bonded particleboard or fiberboard, including fiberboard with a high binder content, as well as biocomposite panels and waterproof panels are also suitable. Waterproof panels are panels, including wood-based panels, that hardly deform or do not swell under the influence of water, and in particular, that hardly swell or do not swell.The carrier plate has a top side, on which the veneer is preferably applied, and a bottom side.

[0025] In principle, it is conceivable that at least two surfaces, and particularly preferably two opposing surfaces, and especially preferably the top and bottom sides of the board, have a stabilized veneer arranged thereon. It is further preferred that the veneered board has a counter-layer on the bottom side and / or opposite a veneer, wherein this counter-layer can also be formed by a veneer or a veneer layer and in particular by a stabilized veneer according to the invention. The counter-layer is intended to compensate for the tensile forces triggered by the shrinkage of the synthetic resin during the curing of the adhesive or the synthetic resin on the top side of the carrier board. The counter-layer can be, for example, a synthetic resin-impregnated paper or a synthetic resin-impregnated cardboard.

[0026] The condensation resin can in principle be any synthetic resin and is used as a binder. The condensation resin is preferably a thermosetting resin, in particular an aminoplastic or phenol-based resin. Typically, melamine resin, phenolic resin, urea resin, or mixtures of these resins are used. Particular preference is given to using a melamine-formaldehyde, a urea-formaldehyde, and / or a phenol-formaldehyde resin, or mixtures of several of these resins, as the condensation resin. The condensation resin is preferably used as an aqueous solution with a solids content of 50% to 60% by weight, with the solids content particularly preferably being equal to the content of synthetic resin or condensation resin. Likewise preferably, the condensation resin or synthetic resin is used in an amount that ensures that the synthetic resin penetrates the veneer at least in sections.Also preferably, the resin application takes place in one step or as an application of exactly one condensation resin or a resin mixture.

[0027] In a preferred embodiment of the method according to the invention, the condensation resin is a postforming resin and / or is made flexible by means of at least one elasticizing agent such that the stabilized veneer can be rolled up into a roll after pressing. Flexibilizing agents that can be used include diols, caprolactam, guanidine derivatives, and sugar. Depending on the required degree of flexibilization, they are added to the condensation resins, preferably in amounts of 2% to 15%, and particularly preferably in amounts of 5% to 10%, based on the mass of the condensation resin. The flexibilizing agent can be added during the production of the condensation resin or subsequently to the finished condensation resin. Furthermore, the finished veneer is preferably rolled up after pressing or after the production of the stabilized veneer to form a roll and / or for further processing as a roll product.

[0028] It is further preferred that the condensation resin comprises at least one additive, in particular from the group consisting of hardener, wetting agent, dye, pigment, effect pigment, flame retardant, ink, UV stabilizer, infrared absorber, conductivity-enhancing agent, antibacterial agent, hydrophobic agent, bleaching agent, and / or mordant. Particular preference is given to using a mixture of two or more additives. At least one additive, some of the additives, or all of the additives can be applied to the stabilizing layer and / or incorporated into the veneer together with the condensation resin. It is also conceivable, however, to apply at least one additive, some of the additives, or all of the additives separately to the condensation resin, to the surface of the stabilizing layer, and / or to the back of the veneer layer, in particular prior to pressing.

[0029] Each additive can be applied as a particulate solid or in liquid form and / or added to the condensation resin. The additive can also be in the form of granules. Alternatively, a liquid or pasty additive can be used. Furthermore, each additive can be completely soluble in the condensation resin, although it is preferred that at least one additive is not soluble in the binder or is not homogeneously soluble in the binder. In particular, it is advantageous to arrange an insoluble additive on the surface of the coated stabilizing layer and / or between the stabilizing layer and the veneer layer so that it is carried or pressed through the veneer layer at least in sections during the pressing process, thereby specifically distributing the additive throughout the veneer. This enables particularly economical use of the additive.On the other hand, a higher concentration of the additive is specifically delivered into the veneer or onto the veneer surface, so that the effect of the respective additive is better guaranteed.

[0030] A significant advantage of the method according to the invention is that a veneer layer with a particularly thin material thickness can be used and then stabilized in such a way that the mechanical properties are at least comparable to those of a veneer layer with a significantly greater material thickness. Accordingly, a preferred embodiment of the method according to the invention provides that the veneer layer has a thickness of less than or equal to 1 mm, preferably between 0.01 mm and 1 mm, more preferably between 0.1 mm and 1 mm, most preferably between 0.2 mm and 0.5 mm, and in particular less than 0.3 mm.

[0031] In general, veneer layers and veneers with such a low thickness are very sensitive to mechanical damage and are also very difficult to handle. In particular, it is not possible to roll such veneers or use them in rolls. However, the stabilizing layer created makes a veneer layer of such a low thickness sufficiently mechanically stable, making it suitable for applications with higher demands on mechanical properties. Finally, suitable stabilization enables the produced veneer to be rolled up despite the low material thickness and / or enables particularly flawless and easy further processing.

[0032] According to a particularly preferred embodiment of the method according to the invention, the pressing is carried out by means of a double-belt press or by means of a CPL press, which on the one hand makes it possible to easily produce a structure of the stabilized veneer with several layers and on the other hand enables continuous production of stabilized veneer. In particular, the use of a double-belt press or generally dynamic pressing makes it possible to produce the stabilized veneer as a roll and / or to roll up long sections of the produced veneer after its production. In particular, this makes it possible to produce a continuous material that can also be used in industries in which the processing of rolls is common. Alternatively, however, the pressing can also be carried out by means of a static press, in particular a short-cycle and / or multi-opening press.

[0033] In order to enable the pressing of condensation resin into the veneer layer, pressing preferably takes place at an elevated temperature and under pressure. An advantageous development of the method according to the invention provides that pressing takes place at a pressure between 10 bar and 100 bar, preferably between 10 bar and 70 bar, particularly preferably between 15 bar and 50 bar and especially preferably between 20 bar and 30 bar and / or at a temperature between 120°C and 250°C, preferably between 150°C and 220°C, particularly preferably between 160°C and 200°C and especially preferably between 170°C and 190°C. Particularly preferably, pressing takes place at 180°C and at a pressure of 25 bar, if necessary.each with a maximum deviation of 10%, since on the one hand a sufficiently deep penetration of the condensation resin into the veneer layer is achieved and on the other hand a complete penetration of the condensation resin through the veneer layer can be prevented, which would lead to an undesirable surface appearance and / or feel of the stabilized veneer.

[0034] Although the stabilizing layer can be made of any material and have any thickness, it is preferred that a parchment, a paper, a nonwoven, a vulcanized or another fiber layer is used as the stabilizing layer and / or that the grammage of the stabilizing layer is between 15 g / m 2 and 500 g / m 2 , preferably between 25 g / m 2 and 300 g / m 2 , particularly preferably between 50 g / m 2 and 250 g / m 2 and most preferably between 50 g / m 2 and 150 g / m 2, especially when using parchment paper as a stabilizing layer.

[0035] In order to better control the penetration of the condensation resin into the veneer layer, a condensation resin with a defined viscosity can be used. In addition, a defined water content is very advantageous, with the use of a condensation resin with a water mass content between 4% and 7% being preferred and between 5% and 6% being particularly preferred. Additionally or alternatively, however, it is also conceivable to dry the coating of the stabilizing layer with the condensation resin to a residual moisture content of less than 10%, preferably less than 8%, particularly preferably less than 7.5%, and most preferably less than 6% before arranging the stabilizing layer on the back of the veneer layer in order to obtain a predefined state before pressing and thus achieve a particularly repeatable and controllable penetration of the condensation resin into the veneer layer using the process. The residual moisture content is particularly preferably at least 5%.Unless otherwise stated, all percentages refer to the mass.

[0036] Of course, it is also possible to impregnate a stabilizing layer with a resin on both sides and then apply a veneer to both sides. The symmetrical structure produces warp-free products. These can be used with or without surface finishing, e.g. as thin, double-sided decorative items. The high mechanical stability is again beneficial here. A further optical and / or haptic design of the resulting stabilized veneer can be achieved in an advantageous development of the method according to the invention by arranging a decorative film, a high-gloss decorative film and / or a texturer, in particular for creating different degrees of gloss, and / or a transfer paper for transferring prints to the veneer on the veneer layer and in particular on the front side or surface of the veneer layer during pressing.

[0037] Finally, a preferred embodiment of the veneered panel provides that the bonding of the stabilized veneer and the carrier plate takes place using an adhesive or resin other than the condensation resin used to produce the stabilized veneer, in particular a PU adhesive or a PU hot-melt adhesive, and / or in a separate bonding and / or pressing process. Particularly preferably, the bonding of the stabilized veneer and the carrier plate takes place by laminating the veneer.

[0038] Several embodiments of a method according to the invention for producing a stabilized veneer are described in more detail below:

[0039] Example 1:

[0040] In a first embodiment of a process for producing a stabilized veneer, a parchment with a grammage of 50 g / m 2coated on one side with a melamine resin in an impregnation channel. The application rate is 100 g resin / m 2 fl.

[0041] The melamine resin has a solids content of 55% by weight. Furthermore, the melamine resin is a so-called postforming resin, meaning a resin that has been made particularly flexible with the help of an elasticizing agent, allowing the stabilized veneer to be bent and, in particular, rolled. Common additives such as hardeners, wetting agents, etc., are also added to the resin; however, these are not essential for the basic properties required for the process.

[0042] The resin applied to the parchment is optionally then dried in the impregnation channel to a residual moisture content of approximately 6% by weight. At the end of the impregnation channel, the parchment is rolled up. The roll containing the parchment is then clamped onto a CPL press or a double-belt press with the resin-coated side facing up and unwound. An oak veneer with a material thickness of 0.6 mm is then carefully placed onto the parchment from another roll to avoid damaging the veneer layer. The unwinding speed is 10 m / min. The CPL press is operated at a temperature of 180 °C and a pressure of 25 bar. Behind the press, the pressed structure of the stabilized veneer is wound up into a veneer roll, which is easy to handle without damaging the veneer. Alternatively, the stabilized veneer can also be cut to any size.

[0043] In contrast to a veneer sheet without stabilization by a backing coating, this one can be handled without damage even in particularly large dimensions, for example 5600 x 2070 mm.

[0044] To test the mechanical stability and, in particular, the compressive strength of the stabilized veneer, the back-coated veneer is then laminated to 8 mm thick HDF using a laminating press. A PU hotmelt adhesive with an adhesive load of 100 g / m² is used as the adhesive. 2For comparison purposes, an oak veneer without a backing was also laminated to HDF. A ball drop test (DIN EN 13329: 2016-08, large ball) was then conducted on both panels. For the panel with the veneer without a backing, a drop height of 750 mm was determined. For the panel with the stabilized veneer with the backing, however, a significantly higher value of 1600 mm was achieved, which impressively documents the mechanical stabilization of the veneer.

[0045] Example 2:

[0046] In a second embodiment of a method for producing a stabilized veneer, an overlay with a grammage of 25 g / m 2 impregnated with a melamine resin in an impregnation channel. The application rate is 180 g / m 2and the solids content is 55 wt%. The melamine resin is again a postforming resin, meaning a resin that has been made particularly flexible with the help of an elasticizing agent, so that the stabilized veneer is bendable and, in particular, rollable. Common additives such as hardeners, wetting agents, etc., are also added to the resin; however, these are not essential for the basic properties required for the process.

[0047] The overlay is dried in the impregnation tunnel to a residual moisture content of approximately 6% by weight. At the end of the tunnel, the overlay is rolled up. The roll containing the overlay is then clamped onto a CPL press and unwound. A 0.6 mm thick oak veneer is then applied to the overlay from another roll. This time, a release paper is applied to the underside of the overlay. The unwinding speed is 10 m / min. The CPL press is operated at a temperature of 180 °C and a pressure of 25 bar.

[0048] By varying the pressing parameters, the rise of the melamine resin could be controlled using temperature and pressure to achieve the best possible impregnation of the veneer without the resin becoming visible on the surface of the veneer. After the press, the pressed structure of the stabilized veneer is either rolled up or cut to size.

[0049] A ball drop test was performed again, which showed a significant improvement in the mechanical properties of the stabilized veneer.

[0050] Example 3:

[0051] In a third embodiment of the method according to the invention, to produce a particularly thin stabilized veneer, a glass fleece with a grammage of 30 g / m 2 impregnated in an impregnation channel with a mixture of urea and melamine resin. The application rate is 60 g / m 2 fl. at a solids content of 55 wt%.

[0052] The melamine resin is again a postforming resin that has been made particularly flexible with the help of an elasticizing agent. The glass mat is then dried in the impregnation channel to a residual moisture content of approximately 6% by weight. At the end of the channel, the impregnated mat is rolled up.

[0053] The roll containing the fleece is then clamped onto a CPL press and unwound. A 0.3 mm thick oak veneer is then deposited onto the fleece from another roll. A release paper runs along the underside of the fleece. The unwinding speed is again 10 m / min. The CPL press is operated at a temperature of 180 °C and a pressure of 25 bar. By varying the pressing parameters, the rise of the melamine resin could be controlled to achieve the best possible impregnation of the veneer without the resin being visible on the upper side of the veneer. Behind the press, the pressed structure of the stabilized veneer is either rolled up or cut to size. Here, too, an improvement in the mechanical properties was demonstrated by a ball drop test.

[0054] Example 4:

[0055] A fourth embodiment of the method according to the invention for producing a particularly thin stabilized veneer differs from the previous embodiment only in that a stabilizing layer made of vulcanized fiber, known as Vulkament, is used to obtain a biocomposite material with a surface made of a real wood veneer, in particular an oak veneer. In this case, too, a ball drop test shows a significant improvement in the mechanical properties.

Claims

Claims for a method for producing a stabilized veneer without a substrate, comprising the following steps: Providing a stabilizing layer, coating one side of the stabilizing layer with a condensation resin, Arranging the stabilizing layer with the coating on the back of a veneer layer, Pressing the stabilizing layer and the veneer layer to form a stabilizing layer, wherein the condensation resin is at least partially forced from the stabilizing layer into the veneer layer during pressing, resulting in mechanical stabilization of the veneer. A method according to claim 1, characterized in that one side of the stabilizing layer opposite the coated side is free of a coating of the condensation resin. A method according to claim 1 or 2, characterized in that a melamine-formaldehyde, a urea-formaldehyde, and / or a phenol-formaldehyde resin, or mixtures of several of these resins, is used as the condensation resin.A method according to at least one of the preceding claims, characterized in that the condensation resin is a postforming resin and / or is made flexible by means of at least one strengthening agent such that the stabilized veneer can be rolled into a roll after pressing. A method according to at least one of the preceding claims, characterized in that characterized in that the condensation resin comprises at least one additive from the group consisting of hardeners, wetting agents, dyes, pigments, effect pigments, flame retardants, inks, UV stabilizers, infrared absorbers, conductivity enhancers, antibacterial agents, water repellents, bleaching agents, and / or mordants. A method according to at least one of the preceding claims, characterized in that the veneer layer has a thickness between 0.1 mm and 1 mm. A method according to at least one of the preceding claims, characterized in that pressing is carried out using a double-belt press. A method according to at least one of the preceding claims, characterized in that pressing is carried out at a pressure between 10 bar and 70 bar and / or at a temperature between 150°C and 220°C.Method according to at least one of the preceding claims, characterized in that a parchment, paper, nonwoven, vulcanized or other fiber layer is used as the stabilizing layer and / or the basis weight of the stabilizing layer is between 50 g / m². 2 and 300 g / m² 2 A method according to at least one of the preceding claims, characterized in that vulcanized fiber is used as a stabilizing layer to obtain a biocomposite material. A method according to at least one of the preceding claims, characterized in that the coating of the stabilizing layer with the condensation resin is dried to a residual moisture content of less than 7.5% before the stabilizing layer is applied to the back of the veneer layer. A method according to at least one of the preceding claims, characterized in that a structuring agent, in particular for generating, is used during pressing. Different gloss levels, and / or a transfer paper for transferring prints onto the veneer are arranged on the surface of the veneer layer.

13. Stabilized veneer without a substrate, with a stabilizing layer pressed onto the back of the veneer layer and a stabilizing layer extending continuously from the stabilizing layer into the back of the veneer layer, made of a condensation resin pressed from the stabilizing layer into the veneer layer.

14. Veneered panel comprising a substrate and a stabilized veneer arranged above the substrate according to at least one of the preceding claims.

15. Veneered panel according to claim 14, characterized in that the bonding of the stabilized veneer and the substrate is carried out by means of an adhesive other than the condensation resin used to produce the stabilized veneer and / or in a separate bonding and / or pressing process.