DE102011004717A1 - Wood-plastic combinations, methods of manufacture and use - Google Patents

Abstract

Wood-plastic combination comprising a WPC substrate (wood plastics composite substrate) in connection with a layer and / or filling of particulate and / or fibrous, woven material. The preferably porous particles are preferably applied as an outer layer on the WPC substrate, which is preferably in the form of a plate, and fixed to the surface or, in the case of substrates in the form of hollow chamber plates, the filling according to the invention can be loosely or fixedly contained in the cavity of the plate be. At least one outer belt of the hollow chamber plate, which limits the filling to the outside, is then preferably additionally used as noise protection components and cladding in the construction sector.

Description

The invention is directed to wood-plastic combinations, processes for their preparation and the use of the thus obtained wood-plastic combinations.

More particularly, the invention relates to an improved wood-plastic combination comprising a WPC substrate (wood plastic composites substrate) for use as a noise control component in the construction and construction industries.

The topic "WPC" has attracted increasing attention in recent years. Good overviews of the status of current developments can be found in " Stadlbauer, Sehnal, Weiermayer, Wood Plastic Composites, Reports from Energy and Environmental Research 68/2006, Federal Ministry of Transport, Innovation and Technology (bmvit), Radetzkystraße 2, 1030 Vienna, Austria "Or even at" AA Klyosov, Wood-Plastic Composites, Wiley & Sons, 1st edition 2007 ".

Historically, solid wood and traditional wood-based materials are typically used as building and furniture materials. The WPC materials have expanded the classic application areas by substantial new application possibilities due to improved molding processes. WPC comes from a combination of wood fibers or particles with a plastic matrix (usually made of thermoplastic materials) and is mainly produced by extrusion or injection molding.

In the original development of WPCs in North America, wood was primarily used as a cheap filler. The cost of wood chips is about one-tenth of the alternative used for plastics, making the share of wood cheaper the material costs in the product. Compared to the plastics used (polyolefins are used more frequently), wood has a higher modulus of elasticity, so that an optimized combination of wood and plastic results in better mechanical properties compared to pure plastic. In addition to a process engineering optimization, the current development of the WPC is very much focused on the optimization of product properties or tailored to specific applications properties.

Due to ever-increasing traffic density, ever-larger regions are being confronted with ever-increasing traffic noise levels. This increasingly requires the use of noise barriers or noise barriers and noise-reducing wall and facade cladding. Especially on bridges noise protection solutions are required that reduce noise efficiently, are stable, have a high resistance to deflection under wind load and at the same time have a low basis weight, in order not to burden the statics of the bridge too much. Very often components of absorbing aluminum cassettes or transparent windows of mineral glass or acrylic glass are used for such noise protection walls. However, there are areas where transparent materials can not be used for acoustic reasons. On the other hand, non-transparent materials may also be disadvantageous. For example, aluminum panels have to be produced with high energy expenditure, which entails environmental and / or cost disadvantages.

The known WPC materials can not be used effectively in noise protection. Due to the materials used, WPC materials are generally subject to outdoor changes as a result of weathering unless they are protected by a surface finish. In addition, the noise protection properties of known WPC materials are not sufficient.

In addition to the WPC materials also exist composites of wood shavings or snippets, which are glued together by special concrete or cement types to be used as a porous, structured surface layer on a cast concrete slab as a sound-absorbing layer. The disadvantage of such elements is their considerable weight due to the concrete used.

In view of the prior art mentioned and discussed herein, it was therefore an object of the invention, in times of scarce energy and raw material resources, to use products with high weather resistance with low energy consumption with the highest possible proportion of renewable raw materials or recycled raw materials as the noise barrier systems. At the same time, the materials used should themselves be as recyclable as possible. It is also intended to provide a method of making such products, as well as the use of these products.

The solution of this problem and other non-specified tasks that can be readily derived or derived from the introductory discussion of the prior art, succeeds with a wood-plastic combination, which has all the features of claim 1. Preferred embodiments of the wood-plastic combination according to the invention are the subject of the dependent claims on the independent product claim.

With regard to the process for producing such wood-plastic combinations, the subject-matter of the independent method claim provides a solution to the claims underlying the invention with respect to the process. Advantageous method modifications are the subject of the dependent method claims.

The use of the products according to the invention as well as the products produced by the process of the invention finds their expression in the claims of the corresponding category.

By virtue of the fact that a wood-plastic combination comprises a WPC substrate (wood plastic composites substrate) in conjunction with a layer and / or filling of particulate and / or fibrous, interwoven material, it is possible to provide a material which is not readily foreseeable which solves the previously defined tasks in an excellent manner.

In particular, the wood-plastic combination according to the invention has a simple structure, is inexpensive, can be made of recycled material and is itself recyclable. The inventive wood-plastic combination can be used outstandingly for sound insulation. Depending on the embodiment, this is achieved by a combination of sound-absorbing and sound-reflecting properties of the combination. The wood-plastic combination according to the invention can be designed in such a way that values for the absorption of sound are achieved which meet all applicable standards. The wood-plastic combination according to the invention is versatile and variable adaptable to all requirements, in particular, it has a low weight and is particularly weather-resistant. The method for producing the inventive wood-plastic combinations is easy durchfuhrbar and feasible only at relatively low cost. The process is based on existing machines and can thus be implemented quickly and inexpensively at the factories.

The wood-plastic combination according to the invention comprise a WPC substrate (wood plastic composites substrate) in conjunction with a layer and / or filling of particulate and / or fibrous, interwoven material. It follows that the inventive wood-plastic combination has at least two components. On the one hand a WPC substrate, on the other hand a particulate or particulate and / or faserformig, interwoven material. These two components are within the meaning of the invention in a certain relationship to one another and connection with each other. In this context, the term "communicating with one another" means in the sense according to the invention that the two components form a combination with one another. This can be realized by a firm and permanent connection, for example in layer form, but it is just as possible that the component of the particulate and / or fibrous, interwoven material of the WPC substrate comprises, is encased, so to speak. The connection of the two components can be solid and durable, but the connection can also be formed loosely and loosely.

WPC substrates according to the invention are known per se to the person skilled in the art. It is a combination of an organic biomaterial with a matrix binder.

Successful materials for the organic biomaterial portion of the WPC substrate include, but are not limited to, shredded or ground wood, wood shavings, wood pellets or wood waste such as sawdust, but also other wood-like biomaterials such as nutshell flour, pulp, chitin, flour of kernels of various fruits, fibrous, pulverizable or ground in any way biomass.

Of the biomaterials, wood is particularly preferred. Wood is used in all possible forms, ranging from wood flour (easily dosed, but hardly reinforcing properties) on wood fibers with different geometries to the pellets (easy to feed and dose, but they are due to the non-constant Kompaktierungsgrades in the extruder different degrees of "open-minded", ie they can lead to a fluctuating quality of the final product).

The proportion of biomaterial in the WPC substrate can vary over a wide range. Generally, the amount of biomaterial in the WPC ranges from 0.01 to 99.99 weight percent, based on the total weight of the WPC substrate comprising biomaterial and binder. Expediently the highest possible proportion of biomaterial is sought to make the cost of the substrate low. Preferred ranges are 10 to 90 weight percent, even more preferred are proportions in the range of 35 to 85 weight percent.

The nature and size, as well as the distribution of biomaterials in the WPC substrate can thereby influence the strength and elasticity of the WPC substrate. The biomass used may be powdered, irregularly broken, fibrous or platelet-shaped. It is preferably fibrous and / or pulverulent. The person skilled in the art can adapt the type, structure, size and distribution of the biomaterial in the WPC substrate to the desired target values of stability and elasticity without undue burden using standard routine tests. Valuable information on this as well he receives further references from the monographs mentioned above. Thus, it is known for wood materials that, for example, a direct connection between wood species and strength properties is to be expected. Furthermore, it is foreseeable that the geometry of the chip (ratio of length / width) influences the strength properties more decisively than the absolute chip size.

The biomaterial, preferably fiber and / or powder material, of the WPC substrate is held together by a matrix of binder. As matrix materials, basically all plastics suitable for processing by means of extrusion and injection molding techniques are suitable. Thermoplastic plastics are preferably used as binders. Among the binders that can be used with particular success include polymethyl (meth) acrylates (PMMA), polycarbonates (PC), polyesters, preferably polyethylene terephthalates (PET) and (PETG), polyvinyl chlorides (PVC), polyolefins, preferably polypropylenes (PP) or polyethylenes (PE), polystyrenes (PS), styrene-acrylonitriles (SAN) and acrylonitrile-butadiene-styrenes (ABS). The thermoplastics are used as binders for the WPC matrix either alone or in a mixture of two or more grades. For the purposes of the invention, binders based on PMMA, PC, and in particular based on polyolefins (PE) and (PP), polyvinyl chloride (PVC), and polystyrene (PS) have been preserved. Of particular interest for the invention is the use of a binder based on polymethyl (meth) acrylate (PMMA).

Here as well as in the description, the parenthetical component (meth) of a polymer stands for the use of the methacrylate and / or acrylate.

Of the binders, those which have a relatively low melting range are also particularly preferred, so that the thermal damage to the biomass during the production process can be avoided as far as possible.

In addition to the biomass and the binder, the WPC substrate can optionally have all additives known in plastics processing in amounts of from 0 up to 300 parts by weight, based on 100 parts by weight of biomass + binder. Preference is given to amounts in the range from 1 to 150 parts by weight, more expediently from 2 to 50 parts by weight. As additives - depending on the application - all known additives in the plastics industry are needed, such as UV stabilizers, antioxidants, lubricants, impact modifiers, heat stabilizers and the like. A special case is the so-called "coupling agents", which are intended to improve the biomass (preferably wood fiber) - plastic matrix - adhesion. These usually consist of a polar group and of a long, nonpolar chain radical (eg maleic anhydride grafted onto PP).

WPC materials which are particularly preferred according to the invention consist of a cellulose-containing material, in particular wood, and a plastic comprising PMMA. Most preferably, these are WPC materials according to the DE 10 2010 030 927 or the DE 10 2010 030 926 , To avoid pure repetition of the text, the subject matter of these patent applications is hereby incorporated explicitly and fully into the content of the present invention.

The shape or external shape of the WPC substrate as well as its appearance can be easily adapted to all requirements of the desired field of application. In principle, all forms are accessible, which can be obtained by way of extrusion or injection molding. So all profiles but also irregular or complex shapes that are not accessible to the continuous casting process but possibly only after the injection molding process, can be produced. A preferred embodiment of the inventive wood-plastic combination provides that the WPC substrate is flat. Preferably, it is plate-shaped. The flat WPC substrates can be massive. The WPC substrate may preferably also be hollow. In the latter case one speaks of a so-called hollow chamber plate.

Hollow panels basically consist of two or more belt plates with intermediate vertical and / or diagonal webs. This structure gives the panels a high stiffness with low weight and good heat-insulating properties. Because of these properties find hollow panels, preferably made of the plastics polymethyl methacrylate, polycarbonate or polyvinyl chloride, usually used in the commercial sector, eg. For example, for greenhouses, industrial and sports halls, and in the private sector, eg. B. for pergolas, terrace roofs and conservatories.

Panoplates based on polyolefins have hitherto been used as packaging material.

Hollow panels are produced by extrusion by means of a tool corresponding to the cross section by simultaneous formation of the outer and middle layers (outer and middle straps) and the webs.

The most common embodiment are the double web plate and the web triple plate, in which the webs at regular intervals run perpendicular to the plane of the plate, so that in cross-section the image of contiguous rectangular chambers arises.

In the context of the invention, basically all known hollow-chamber plate geometries can be used as WPC substrates. Thus, panels with two, three or four straps with vertical bars or inclined bars or combinations thereof can be used.

The thickness of the straps is generally not critical. However, the thickness should be sufficiently large in order to ensure a sufficient overall stability of the hollow chamber plate, and on the other hand, a flatness of the entire plate can be achieved. If the thickness of the straps is too small, fluctuations in the thickness may result from the manufacturing process of the hollow chamber plate, in particular in the areas of the webs, which should be avoided as far as possible.

Due to the simplicity of manufacture and the low price, hollow panel panels having vertical lands are sufficient and particularly preferred for use as a WPC substrate in accordance with the invention. Furthermore, the use of a hollow chamber plate is particularly preferred, which is executed in the form of a Schrägstegdoppelplatte or a so-called truss plate.

In addition to the WPC substrate, the wood-plastic combination according to the invention has as an essential constituent so-called particulate and / or fibrous, interwoven material. Particulate or particulate or particulate material in the context of the invention means particles or equivalent particles. The particles associated with the WPC substrate may be of any shape. They can be regular or irregular. Preferably, the particles are regularly shaped in the invention, particularly expediently, the particles are spherically shaped. The term spherical in the context of the present invention means that the particles preferably have a spherical shape, it being obvious to the person skilled in the art that particles of a different shape may also be present due to the production methods, or that the shape of the particles may deviate from the ideal spherical shape , The size of the particles can vary over a wide range. Thus, the particles may have a narrow size distribution, but they may also be less uniform, that is, have a relatively wide or "wide" size distribution. Preferred for the invention are narrow size distributions, i. H. Particles with the largest possible uniform distribution of the particle size and homogeneity.

The particles themselves can be massive or porous. For the purposes of the invention, particulate particles are most preferred. Basically, porosity of particles in the context of the invention is understood as a measure of the density of a substance or mixture of substances with cavities. It is the relative density in comparison to the massive substance. The porosity is given as a dimensionless number and is composed of the sum of the voids of the particulate material, which are related to each other and to the environment (open porosity) and the unconnected cavities (closed porosity). The porosity of the porous particulate material which can be used with great success for the purposes of the invention is preferably in the range of from 0.2 to 0.7, more preferably in the range of from 0.25 to 0.65 and even more preferably in between 0.3 and 0.6.

To successfully connect with the WPC substrate, d. H. In combination, particles include particles of inorganic material as well as particles whose material has organic origin. Mixtures of particles of inorganic and organic material are possible as well as mixed particles on an inorganic and organic basis.

Among the particles of inorganic material, for example, those based on silica are useful. Sandables, quartz sand, ground recycled glass and the like are among the particles which can be used in this way.

Particles of organic origin preferably comprise molding compound particles based on thermoplastic molding material. These include, but are not limited to, PMMA molding compound particles or WPC molding compound particles. Under molding composition in this context is a melt-processable, d. H. understood by continuous casting and / or injection molding on the thermoplastic state moldable mass. Such molding compound particles and ways for their preparation are known in the art. A frequently used method for producing plastics in particle form is, for example, suspension or bead polymerization. Also known is the process of emulsion polymerization. In bead polymerization, the monomers to be polymerized (for example, MMA or styrene) and a crosslinker (for example, divinylbenzene) are added together with small amounts of a radical initiator (eg, azobisisobutyronitrile) to a liquid with which they do not mix. Strong stirring produces liquid beads from the mixture to be polymerized. The size of these beads depends u. a. from the stirring speed. By increasing the temperature, the polymerization in these Flussigkeitsperlen and it receives the known bead polymer.

Particularly preferred examples of fibrous, interwoven materials in the context of the present invention are glass wool, rock wool or other weather-resistant, fibrous, interwoven materials of artificial or natural origin.

The particulate and / or fibrous, interwoven material can now be combined with the WPC substrate in various ways within the scope of the invention. In any case, care should be taken that the combination of particulate and / or fibrous interwoven material with the WPC substrate achieves sound absorption.

On the one hand, this can be done by equipping the side of a WPC substrate facing a possible sound source with particulate material. Thus, a preferred embodiment of the wood-plastic combination according to the invention characterized in that the particulate material is applied in the form of a layer on a surface of the WPC substrate. The particulate material serves in this case as a sound absorption material, and it is particularly expedient if the particulate material is porous. The sound is destroyed the better, the more porous the material and the larger the surface of the material. In a further preferred modification of the wood-plastic combination according to the invention, this effect can be assisted by structuring the layer of the particulate material to enlarge the surface itself. This means that the layer itself is wave-shaped, comprises ribs and / or nubs, is present in the form of egg-box structures and the like.

In addition to the attachment of the sound-absorbing layer of particulate material on the outside of a WPC substrate, it is preferred in yet a modification of the wood-plastic combination according to the invention that the layer of particulate and / or faserformigem, interwoven material as filling inside a hollow panel, as WPC substrate acts, is arranged. The filling can preferably be present as a bed in the hollow interior of a plate. The debris can fill the internal cavity completely or only partially. Even with a partial filling of the inner cavity of the chambers of a hollow plates, a noticeable sound absorption effect can be achieved. It is preferred in this case if the particles arranged to destroy the sound waves in the interior of the hollow chamber plate have as large a surface as possible. Therefore, a particle density as high as possible from particles with the largest possible porosity is preferred here as well.

In a particularly favorable embodiment, the wood-plastic combination of the invention is characterized in that the WPC substrate is a hollow chamber plate, wherein the hollow chamber plate has at least two straps, wherein a layer of porous material outwardly limiting belt is perforated. Characterized in that the outer belt has holes, the access of the sound waves to the present as a filling in the interior of the hollow chamber plate particle layer or layer of fibrous, interwoven material allows and the absorption and destruction of the sound is clearly required.

A particularly expedient and effective embodiment of a wood-plastic combination is achieved in accordance with the invention by providing both the side of the WPC substrate facing a potential sound source with a layer of particles and / or fibrous, interwoven and at the same time as WPC substrate. Substrate uses a hollow chamber plate, the inner chambers are filled with a filling according to the invention, wherein the sound source facing belt of the hollow chamber plate has perforations, which enter the sound in the chambers provided with the filling, but which are also designed so that a "leakage" the filling in the case of a particle bed is excluded as a filling. This can preferably take place in that the openings are designed to be tapering towards the interior of the plate - that is to say conically - and / or that the debris is not fixed loosely but by means of a suitable adhesive in the interior of the chambers.

For the sake of clarification, it should be emphasized once again that the suitability of the materials according to the invention for use in the field of sound insulation does not have to be based or must be based solely on their sound-absorbing properties. In application areas in which the most complete possible sound absorption is necessary, the materials according to the invention can be equipped accordingly as described above. However, there are also areas of application in which it is mainly about sound insulation or the propagation of the sound must be prevented according to one direction as possible. In addition to the above-described sound absorption properties of the materials according to the invention, the sound-reflecting properties of WPC materials can also be exploited in these fields of application. By suitable combination of z. B. sound swallowing inventive filling and sound-reflecting surface of WPC materials or by partially according to the invention sound swallowing designed surface and partially sound reflective surface left the materials of the invention can be adapted to the corresponding requirement profile of the planned application.

• a) ein Substrat aus einer Holz-Kunststoff-Kombination (WPC-Substrat) formt; und
• b) das geformte Substrat mit partikularem und/oder faserförmigen, verwobenen Material versieht.

The invention also provides a process for producing wood-plastic combinations comprising a WPC substrate (wood plastic composites substrate) in conjunction with a layer of particulate material, in which method

• a) forms a substrate from a wood-plastic combination (WPC substrate); and
• b) providing the shaped substrate with particulate and / or fibrous interwoven material.

According to the method of the invention, WPC substrates of any shape can be produced. For example, it is also possible to produce difficult geometries with (undercuts or with different thicknesses in different areas of the WPC substrate by injection molding.) However, it is expedient to modify the method, which is characterized by the fact that flat substrates are formed in step a).

Of particular interest are process variants, which are characterized in that one forms a massive plate in step a).

Also particularly useful are methods in which one forms a hollow chamber plate in step a).

Both the solid plates and any hollow panels are preferably formed by extrusion.

Extrusion is a continuous process for producing profiles (hollow or solid profiles) or granules. Basically, a distinction is made between direct extrusion (single-stage process in which the mixing of the components and the profile production takes place in one process step in the extruder) and the extrusion of premixes (in a first step, the granules are produced, which are then extruded into the profile in another extruder becomes). In the extruder, there are currently 3 types that are used for WPC extrusion, namely the conical twin-screw extruder, the parallel twin-screw extruder and the single-screw extruder. The conical twin-screw extruder is the preferred machine for WPC extrusion. The main advantage of the conical screws - large diameter in the intake area and continuous compression by the conical screws - favors this machine for highly filled systems, since it must accomplish very high material compaction in the extruder. The relatively short design guarantees a short residence time of the melt in the extruder and thus reduces the thermal load on the wood chips. Single-screw extruders are used where the finished granules are used as raw material, since the mixing effect is considerably worse compared to twin-screw extruders. The main advantage is the much lower price. The individual process steps are now possibly pre-drying of the wood fibers, compression and plasticization in the extruder, venting and degassing (either atmospheric or with the help of vacuum), further plasticizing and mixing, shaping in the tool, calibration, cooling, cutting to length and surface treatments such as brushing or foiling.

A preferred variant of the process of the invention provides that in step b) thermoplastic particles are applied to an outwardly facing surface of the plate and the particles applied are thermally fixed on the surface.

Another preferred method variant according to the invention comprises that in the case where a WPC substrate in the form of a hollow chamber plate in step a) is formed, in step b) a cavity or the entire cavity of the hollow chamber plate with a filling of particulate and / or fibrous Fills interwoven material and perforates the strap that limits the filling to the outside.

Yet another particularly expedient variant comprises the combination of the two methods described above, namely the coating of the outside of the WPC substrate, as well as the inventive filling of the interiors of the hollow chambers of the WPC substrate.

For the method of the invention, the particles can be fixed on the surface of the outside of the WPC substrate in any conceivable manner. So you can proceed in a variant such that one heats a previously prepared plate again to a temperature below the Vicat temperature of the WPC substrate, the particles, preferably plastic molding compound in particle form, before heating or during heating or after sprinkling and the plate together with the scattered molding material particles annealed, for example in a tempering furnace. During annealing, the at least partially flowable state results in sufficiently strong bond formation (based on physical bonding principles, as opposed to chemical bonds) between particles and WPC substrate.

In principle, one can also proceed by sprinkling the particles onto the still hot WPC extrusion strand so that the comparatively cold particles can partially sink into the not yet finally solidified surface of the WPC substrate and thus partly from the WPC substrate after it has solidified enclosed and fixed.

In yet another alternative, it is possible to apply the particles and / or the fibrous, entangled material to the extruded WPC sheet and effect the fixation of the particles with an adhesive, adhesive or reactive resin.

Yet another expedient variant involves sprinkling particles onto the WPC substrate and fixing the particles using microwave radiation.

Optionally, the bond between particles and WPC substrate can also be achieved by heat in conjunction with pressure.

Finally, the compound or combination between particles and WPC substrate can also be effected by coextrusion of a solid plate or web plate / hollow chamber plate (soundproof, non-porous carrier) and a porous Coex layer.

In a particular variant of the method according to the invention, cavities in the interior of the WPC substrate are brought into contact with particulate material. This is done suitably by introducing a particle bed in cavities of the substrate.

A particular variant of the inventive method is in this context characterized in that one uses as a particulate material plastic molding compound recycled broken or ground silicate glass and fibrous, interwoven material rock wool or glass wool or a combination of two or more varieties of the aforementioned materials.

It is also zweckmaßig so before, provides the traffic facing side of the WPC hollow chamber profiles with holes and filled the interior with molding material particles, rock wool, glass wool, a bed of recycled broken or ground silicate glass or other organic or inorganic porous materials.

The invention also includes the use of the described wood-plastic combinations and the use according to the inventive method obtainable wood-plastic combinations. This opens up universal application possibilities in all areas of noise protection. Due to the universal formability of the material, the application has virtually no limits. Added to this is the weather resistance of the WPC material.

Preferred is the use of a wood-plastic combination as described herein as sound-absorbing and / or sound-absorbing construction element.

Particular variants of the use relate to the use as acoustic panels, wall, ceiling or facade cladding, facing shell in front of concrete wall or tunnel walls, noise barrier wall element or sound-absorbing machine cladding.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102010030927 [0025]
• DE 102010030926 [0025]

Cited non-patent literature

• Stadlbauer, Sehnal, Weiermayer, Wood Plastic Composites, Reports from Energy and Environmental Research 68/2006, Federal Ministry of Transport, Innovation and Technology (bmvit), Radetzkystraße 2, 1030 Vienna, Austria [0003]
• AA Klyosov, Wood-Plastic Composites, Wiley & Sons, 1st Edition 2007 [0003]

Claims (13)

Wood-plastic combination comprising a WPC substrate in conjunction with a layer and / or filling of particulate and / or fibrous, interwoven material. Wood-plastic combination according to claim 1, characterized in that the particles of the particulate material are poros. Wood-plastic combination according to claim 1 or 2, characterized in that the WPC substrate is flat, in particular a solid plate or a hollow chamber plate. Wood-plastic combination according to one of claims 1 to 3, characterized in that a layer of particulate material is applied to a surface of the WPC substrate, wherein the layer is preferably structured to increase the surface area and or a filling of particulate material and / or fibrous, interwoven material is arranged in the interior of the hollow chamber plate. Wood-plastic combination according to claim 3 or 4, characterized in that the hollow chamber plate has at least two straps, wherein a layer of porous material outwardly limiting belt is perforated. A process for the production of wood-plastic combinations comprising a WPC substrate in conjunction with and / or filling of particulate and / or fibrous, interwoven material, which method a) forming a substrate from a WPC material; and b) providing the shaped substrate with particulate and / or fibrous interwoven material. A method according to claim 6, characterized in that in step a) a sheet-like substrate, preferably a solid plate or a hollow chamber plate is formed. A method according to claim 7, characterized in that the plate is formed by extrusion. Method according to one of claims 6 to 8, characterized in that applying in step b) on an outwardly facing surface of the plate thermoplastic particles and the applied particles thermally fixed on the surface. Method according to one of claims 6 to 8, characterized in that one fills a cavity or the entire cavity of the hollow panel with a filling, preferably debris of particulate material or of a fibrous, interwoven material, and that belt, which limits the bed to the outside , perforated. Method according to one of claims 6 to 10, characterized in that one uses as a particulate material plastic molding compound, recycled broken or ground silicate glass and fibrous, interwoven material rock wool or glass wool or a combination of two or more varieties of the aforementioned materials. Use of a wood-plastic combination according to claims 1 to 5 or obtainable by the method according to claims 6 to 11 as a construction element in the field of sound insulation, in particular as a sound-absorbing and / or reflective construction element. Use according to claim 12 as acoustic panels, wall, ceiling or facade cladding, facing shell in front of concrete retaining walls or tunnel walls, noise protection wall element or sound-absorbing machine cladding.