WO2014029887A1 - Method for printing on a wall or floor panel - Google Patents

Description

 Method of printing a wall or floor panel

The present invention relates to a method of making a decorated wall or floor panel, and to a panel made according to such a method.

Such decorated panels are known per se, whereby the term wall panel is also to be understood as panels which are suitable for ceiling clothing. They usually consist of a support or core of a solid material, e.g. a wood material, which is provided on at least one side with a decorative layer and a cover layer and optionally with other layers, for example a arranged between the decorative and top layer wear layer. The decorative layer is usually a printed paper impregnated with an aminoplast resin. The cover layer and the remaining layers are usually made of aminoplast resin.

In certain applications, however, the use of conventional laminate panels based on fiber materials is difficult, for example in areas which are exposed to constant humidity or weathering. This is the case for example in outdoor areas, in damp areas or in special fields of application such as shipbuilding. Here, the influence of moisture can lead to a source of fiber material, both the fiber-based substrate, as well as the decor papers used. Therefore, it is necessary for the application in these areas to provide appropriate moisture and weather resistant panels, for example made of plastic. However, known plastic pannels show an unsatisfactory decoration, especially if the imitation of a natural material such as wood or natural stone is desired.

It is therefore the object of the present invention to provide an improved method for the production of decorated wall or floor panels.

This object is achieved by a method according to claim 1. With regard to the wall or Bodenpaneels the object is achieved by a panel according to claim 14.

The invention thus proposes a method for producing a decorated wall or floor panel, comprising the method steps:

a) providing a plate-shaped carrier,

b) applying a primer to at least one surface of the plate-shaped carrier to be printed,

c) applying a decoration by printing on at least a part of the surface treated with the primer, which is characterized in that a liquid radiation-curable mixture based on a urethane acrylate is used as the primer.

Surprisingly, it has been found that when using a primer based on a urethane acrylate, the disadvantages known from the prior art with regard to the adhesive strength of the applied decorative layer can be overcome.

The urethane acrylate may be present in the form of reactive oligomers or prepolymers in the primer composition. In the context of the invention, the term "reactive oligomer" or "prepolymer" is to be understood as meaning a compound having urethane acrylate units which can be radiation-induced, if appropriate reacting with urethane acrylate polymer with the addition of a reactive binder or a reactive diluent. Urethane acrylates in the context of the invention are compounds which are essentially composed of one or more aliphatic structural elements and urethane groups. Aliphatic structural elements include both alkylene groups, preferably having 4 to 10 C atoms, and cycloalkylene groups having preferably 6 to 20 C atoms. Both the alkylene and the cycloalkylene groups can be mono- or polysubstituted with C ₁ -C 4 -alkyl, in particular with methyl, and contain one or more nonadjacent oxygen atoms. The aliphatic structural elements are optionally connected to one another via quaternary or tertiary carbon atoms, via urea groups, biuret, urethdione, allophanate, cyanurate, urethane, ester or amide groups or via ether oxygen or amine nitrogen. Furthermore, urethane acrylates within the meaning of the invention may also have ethylenically unsaturated structural elements. These are preferably vinyl or allyl groups which may also be substituted by C 1 -C ₄ -alkyl, in particular methyl, and which are derived in particular from, β-ethylenically unsaturated carboxylic acids or their amides. Particularly preferred ethylenically unsaturated structural units are acryloyl and methacryloyl groups such as acrylamido and methacrylamido and in particular acryloxy and methaciyloxy.

Radiation-curable in the sense of the invention means that the primer composition is induced by electromagnetic radiation of suitable wavelength, e.g. UV radiation, or electron radiation can be at least partially polymerized.

In addition, the radiation-curable primer used according to the invention can have a photoinitiator. The photoinitiator serves to initiate a radical polymerization of the urethane acrylate or the urethane acrylate oligomers or prepolymers to the corresponding polymer. Suitable photoinitiators are, for example, benzophenone and benzophenone derivatives, such as 4-phenylbenzophenone and 4-chlorobenzo-phenone, 4,4'-bis (dimethylamino) benzophenone, anthrone, acetophenone derivatives, such as 1-benzoylcyclohexan-1-ol, 2-hydroxy-2,2 -dimethylacetophenone and 2,2-dimethoxy-2-phenylacetophenone, benzoin and benzoin ethers, such as methyl, ethyl and butyl benzoin ethers, benzo ketals, such as benzil dimethyl ketal, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propane-1-one,

Anthraquinone and its derivatives such as b-methylanthraquinone and tert-butylanthraquinone, acylphosphine oxides such as 2,4,6-trimethylbenzoyldiphenylphosphine oxide, ethyl 2,4,6-trimethylbenzoylphenylphosphinate and bisacylphosphine oxides. The photoinitiator may preferably be present in a concentration of between> 0% by weight and <15% by weight, more preferably between> 1% by weight and <10% by weight in the primer composition.

Furthermore, the primer composition which can be used according to the invention, as already mentioned above, can have a reactive diluent. Suitable reactive diluents are, for example, monofunctional or polyfunctional acrylates such as, for example, 2-hydroxyethylmethylacrylate (HEMA), hydroxypropylmethylacrylate (HEPA), hydroxyethylacrylate (HEA), hydroxypropylacrylate (HPA), tripropylene glycol diacrylate (TPGDA), 1,6-hexanediol diacrylate (HDDA), propoxylated glycerol triacrylate ( G3POTA), or pentaerythritol triacrylate (PETIA), trimethylolpropane triacylate (TMPTA), pentaerythritol tetraacrylate (PETA). The reactive diluent in the primer composition may preferably be present in a concentration of between> 1% by weight and <40% by weight, more preferably between> 10% by weight and <30% by weight. In addition, the primer composition which can be used according to the invention may contain further constituents, for example UV stabilizers, rheology agents such as thickeners, free-radical scavengers, leveling agents, antifoams or preservatives. Examples of UV stabilizers are oxanilides, triazines, benzophenones or benzotriazole, which also in combination with radical scavengers such as sterically hindered amines, such as 2,2,6,6-tetramethylpiperidine, 2,6-di-tert-butylpiperidine or their Derivatives, e.g. Bis (2,2,6,6-tetramethyl-4-piperidyl) sebacinate. It may also be provided in one embodiment of the invention that is used as primer, a composition having pigments or dyes. However, preference may be given to using a primer which is free of dyes or pigments or which is colorless. This can prevent that due to unevenness of the carrier, a locally limited additional application of the primer leads to spots that could adversely affect the printed image.

In a preferred embodiment of the method according to the invention, a primer composition is used which is substantially free of non-polymerizable solvents. This avoids that any degassing solvent to an impairment of the subsequent auszubringenden decor, for example, by a bleeding of color points lead. Due to the extensive freedom of non-polymerizable solvents emission of solvent is significantly reduced both during the manufacturing process, as well as from the finished wall or floor panel.

The use of radiation-curable primers based on urethane acrylates allows, in one embodiment and not restricting, a subsequent application of a decoration, for example by means of digital printing technology, immediately following the application and the radiation-induced curing of the primer layer. The primer layer ensures good adhesion of the applied decoration on the carrier surface coated with the primer. In this case, urethane acrylates have the advantage of good adhesion both to the support material and to the decorative layer, ie the decorative color or ink. This is due inter alia to the polymerization reactions occurring in this type of polymers, in which on the one hand a radiation-induced radical polymerization of the OH groups occurs, on the other hand, a post-curing of the polymer via the NCO groups. As a result, after the radiation-induced curing, a tack-free and workable surface is immediately obtained, while the final ones Properties of the primer layer can also be influenced by the NCO group-based post-curing and ensure a secure bond to the substrate. In addition, the postcuring that occurs ensures that sufficient layer stability is achieved even in less or unexposed areas of the support. In this way, in particular, pre-structured carriers, ie carriers whose surface already has a three-dimensional structuring, can be provided with a primer layer with the method according to the invention, which ensures that the subsequently applied decoration is adhesively bonded to the carrier. The primer can be applied in the inventive method preferably by means of rubber rollers on the support plate. Alternatively, an order can be made by means of a casting machine. It may also be provided that the primer is sprayed onto the carrier plate. Depending on the application technique, the viscosity of the primer composition can be adjusted by varying the reactive diluent content in the composition. Particularly preferably, the primer can be applied to the carrier, in particular using a spatula. This application allows a particularly uniform surface and, consequently, a particularly good print image, since any existing unevenness of the carrier can be optimally compensated.

The primer is preferably used in an amount between> 1 g / m ² and <100 g / m ² , preferably between> 10 g / m ² and <50 g / m ² , in particular between> 20 g / m ² and <40 g / m ² applied. Following the application of the primer to the carrier surface, irradiation is carried out with a radiation source of suitable wavelength.

According to a preferred embodiment of the method, the radiation-induced curing of the primer takes place by means of irradiation with a wavelength between 100 nm to 380 nm, preferably between 250 nm and 380 nm, for example by means of a Hg, Ga, or Fe. Metal halide lamp. Depending on the production speed and the exposure time resulting therefrom, the radiation power is in a range between> 50 mW / cm ² and <30 W / cm ² , preferably between> 0.5 W / cm ² and <15 W / cm ² . As an alternative to metal halide lamps, it is also possible to use LED UV radiators having a suitable emission wavelength in the method according to the invention. The exposure time may be in a range between 0.1 s and 180 s, preferably between 0.5 s and 60 s, depending on the radiant power.

In one embodiment of the method according to the invention, the decoration is applied directly to the radiation-induced at least partially cured primer layer by means of the Dmck technique. It can be provided that the print by means of high-pressure method, such as flexographic printing, offset printing, gravure printing or through printing, such as screen printing is applied to the primer layer. In particular, it may be provided that the printing of the decor by means of digital printing method, such as inkjet method, is applied. It is preferred regardless of the printing method used that the decor is applied medium radiation-curable inks or inks.

In the context of the invention, the term radiation-curable ink is understood to mean a composition containing binder and / or filler and having color pigments which can be at least partially polymerized by electromagnetic radiation of suitable wavelength, such as UV radiation or electron radiation. The term radiation-curable ink is to be understood in the context of the invention, a substantially filler free, color pigments having composition which induced by electromagnetic radiation of suitable wavelength, such as UV radiation, or electron beam can be at least partially polymerized. According to a further preferred refinement, the method may comprise the further method step before method step c) and in particular after method step b):

e) applying a resin composition which contains between> 5% by weight and <85% by weight, preferably between> 10% by weight and <80% by weight, of a solid having an average particle diameter ds ₀ between> 0.1 μm and <120 μιτι has.

Surprisingly, it has been found that the application of a printing substrate made of a resin composition having a corresponding solids content as defined above, for example after the application of a primer, is suitable for providing a surface which is excellently suitable for a subsequent direct printing, which furthermore has very good adhesion to a subsequent applied covering or wearing layer, so that a laminate produced using this embodiment has a high stability at the same time exquisite print image. This can apply in particular by a specific combination of the aforementioned primer layer with an aforementioned printing substrate. The stated solid part of the resin composition refers to the liquid resin composition. Thus, the application of a previously described printing substrate can in particular combine a particularly good printed image with a particularly good stability of the panel to be produced. In this case, a different composition can be used in particular in a repeated application of the printing substrate. For example, although a first layer may have the above-described fillers and be approximately free of dyes and pigments, a subsequent layer may have a printing substrate with dyes such as pigment paint and in particular the fillers. Furthermore, the layers may vary in the type and amount of the fillers or dyes and pigments used. In this way, an improved adaptability to the following applied decor, such as the decorative paint, possible. In the process, the application of the resin composition by means of application rollers, a spraying device, doctor blades, blade coating, air brushes, cast iron devices, slot dies, curtain or other suitable devices can be carried out. In particular, the above-described resin composition can be effected by means of roller application, wherein provision may be made for a multiple, in particular two times, roller application to take place. In this case, a resin composition can be applied to a non-specifically dried further layer of a resin composition, or preferably before the second application or in each case further applications, the respective lower layer already applied can be dried. As a result, a particularly good print image can be generated. The resin composition can be applied, for example, with a total application amount of between> 5 g / m ² and <50 g / m ² , preferably> 10 g / m ² and <40 g / m ² .

In this case, the printing underlay provided according to the invention is suitable both for flexographic printing, offset printing or screen printing methods and, in particular, for digital printing techniques, such as, for example, inkjet methods or laser printing. Thus, the provided with the printing substrate surface can be printed directly. In this regard, it should be noted that printing a surface may include direct printing, as well as indirect or indirect printing. Thus, printing on at least a part of the surface treated with the primer, for example, direct direct printing or indirect printing may mean printing on, for example, a further layer applied to this surface. In other words, printing on at least part of the surface treated with the primer should mean that the primer is printed directly to apply a decoration, or else a printing substrate optionally applied to the primer.

Furthermore, it may be provided in one embodiment of the method, that according to method step e) a resin composition is applied, which is a hardener wherein the hardener in the resin composition, for example, in a concentration between> 0.05 wt .-% and <3.0, preferably> 0.15 wt .-% and <2.0 wt .-, more preferably between > 0.5 wt .-% and <2.0 wt .-% is included. The provision of a hardener in the resin composition makes it possible to optimize the setting or hardening behavior of the resin composition. The hardener may be a solution of organic salts, for example. The hardener preferably has an acidic pH, preferably between> pH 0.5 and <pH 7, preferably> pH 0.5 and <pH 6. For example, a so-called latent hardener is used as a hardener. Deterent hardeners are distinguished by the fact that, after their addition to the resin, on the one hand a sufficient processing time at room temperature and on the other hand the shortest possible curing time at the subsequent processing temperatures is achieved. The effect of the latent hardeners is that they are ineffective at ordinary temperatures and only release an acid at elevated heat or due to a chemical reaction, which accelerates the curing process. Examples of latent hardeners include alkyl or alkanolamine salts of sulfurous acid, amidosulfonic acid, 3-chloro-l, 2-propanediol, p-toluenesulfonic acid, morpholine, ammonium sulfate, ammonium chloride, ammonium sulfite, ammonium nitrate, ethanolamine hydrochloride, dimethylethanolammonium sulfite, or diethanolammonium sulfamate.

In particular, the hardener may be an aqueous, preferably non-ionic, solution. An example of a suitable hardener is MH-180 B (Melatec AG, Switzerland). According to a further embodiment of the method, according to process step e), a resin composition can be applied which comprises as solid at least one compound selected from the group consisting of titanium dioxide, barium sulfate, barium oxide, barium chromate, zirconium (IV) oxide, silicon dioxide, aluminum hydroxide, aluminum oxide, iron oxide, Iron (III) hexacyanoferrate, chromium oxide, cadmium oxide, cadmium sulfide, cadmium selenite, cobalt oxide, cobalt phosphate, cobalt aluminate, vanadium oxide, bismuth vanadium oxide, tin oxide, copper oxide, copper sulfate, copper carbonate, lead antimonate, lead chromate, lead oxide, lead carbonate, calcium carbonate, calcium sulfate, calcium aluminate sulfate, zinc oxide, zinc sulfide, Arsenic sulphide, mercury sulphide, carbon black, graphite, or mixtures thereof. Through the use of such solids, it is possible in particular to provide a colored printing substrate whose coloration has a property which supports the decor pressure. Thus, for example, in a decorative design, which is to represent a dark wood, a printing substrate with a brown or brownish ground tone are applied, while in a decor design, which should represent a light wood or a light stone, a printing substrate with a yellow or white ground tone are applied.

According to a further embodiment of the method, in method step e) a resin composition can be applied which has as resin component at least one compound selected from the group consisting of melamine resin, formaldehyde resin, urea resin, phenolic resin, epoxy resin, unsaturated polyester resin, diallyl phthalate or mixtures thereof. It has surprisingly been found that the use of a corresponding resin component in combination with the solids content in the resin composition, a printing substrate can be provided, which allows a significantly improved adhesion of a final applied cover and / or wear layer, resulting in improved stability of the Laminates leads. The resin composition may, for example, a resin content of between> 15 wt .-% and <95 wt .-, preferably between> 20 wt .-% and <90 wt .-%, more preferably between> 25 wt .-% and <65 wt .- exhibit.

According to a preferred embodiment of the method, it can be provided in particular that, in process step e) a resin composition having a viscosity that a Outflow time between> 7 s and <60 s from a standard outlet cup, is applied. The viscosity is determined in accordance with DIN 53211 by means of an outlet cup with an outlet nozzle width of 4mm. After application of the resin composition in process step e), a drying step preferably follows, in which the subsequently to be printed surface is at least partially dried. For this purpose, it may be provided that on the surface to which the resin composition has been applied, in particular the surface of the primer layer, a surface temperature between> 75 ° C and <125 ° C, preferably between> 80 ° C and <1 10 ° C. , in particular between> 90 ° C and <100 ° C is generated. To produce a corresponding surface temperature, for example, IR emitters, NIR emitters, nozzle dryers or similar devices are suitable. The surface temperature mentioned is preferably set for a period between> 1 s and <600 s, preferably between> 5 s and <400 s, more preferably between> 10 s and <300 s.

The resin composition applied in the process step e) may further contain, in addition to the aforementioned ingredients, ingredients such as rheology agents for adjusting the viscosity, water, flow improvers, preservatives, surfactants, antifoaming agents or the like.

For drying the backing as well as for drying the primer, it may be advantageous that a plurality of radiators, such as in particular UV lamps is used. For example, four radiators can be used. This allows a particularly complete and uniform coverage of the surface to be dried and furthermore a particularly flexible and thus application-related drying realize. According to a further preferred embodiment of the invention, it may be provided that a wear and / or cover layer is applied to the decorative layer. It is particularly preferred that also a radiation-curable composition, such as a radiation-curable lacquer is applied to form the wear and / or cover layer. It can be provided that the wear layer hard materials such as titanium nitride, titanium carbide, silicon nitride, silicon carbide, boron carbide, tungsten carbide, tantalum carbide, alumina (corundum), zirconium oxide or mixtures thereof, to increase the wear resistance of the layer. It may be provided that the hard material is present in an amount of between 5% by weight and 40% by weight, preferably between 15% by weight and 25% by weight, in the wear layer composition. Preferably, the hard material in this case has a mean grain diameter between 10 μιη and 250 μπι, more preferably between ΙΟμπι and ΙΟΟμπι on. In this way, it is advantageously achieved that the wear layer composition forms a stable dispersion and segregation or settling of the hard material in the wear layer composition can be avoided.

To form a corresponding wear layer, it is provided in one embodiment of the invention that the hard material-containing and radiation-curable composition in a concentration between 10 g / m ² and 250 g / m ² , preferably between 25 g / m ² and 100g / m ² applied becomes. In this case, the application can be applied for example by means of rollers, such as rubber rollers or by means of pouring devices.

In a further embodiment of the method according to the invention, it may be provided that the hard material is not present in the composition at the time of application of the wear layer composition, but is scattered as particles onto the applied wear layer composition and this is subsequently cured in a radiation-induced manner. According to one embodiment of the method, the carrier plate consists of a plastic, in particular a thermoplastic, elastomeric or thermosetting plastic, paper or cardboard. Also plates of minerals such as natural and artificial stone slabs, concrete slabs, gypsum fiberboards, so-called WPC plates (from a mixture of plastic and wood), as well as plates of natural raw materials such as cork and wood can be used according to the invention as a carrier. Also plates of biomass such as straw, corn straw, bamboo, foliage, algae extracts, hemp, oil palm fibers, can be used according to the Invention. Furthermore, recycled materials from the materials mentioned can be used in the context of the method according to the invention.

The backing sheet material may be solid or have more or less large voids, depending on the desired physical properties of the finished sheet. be foamed or have cavities whose size is of the order of the plate dimensions. It is also possible to use layer structures of a plurality of the stated materials, for example plasterboard or wood-plastic laminated boards.

Preferred as sheet material are thermoplastics such as polyvinyl chloride, polyolefins (for example, polyethylene (PE), polypropylene (PP), polyamides (PA), polyurethanes (PU), polystyrene (PS), acrylonitrile-butadiene-styrene (ABS), polymethyl methacrylate (PMMA ), Polycarbonate (PC), polyethylene terephthalate (PET), polyetheretherketone (PEEK) or mixtures or co-polymers thereof The plastics can contain conventional fillers, for example calcium carbonate (chalk), aluminum oxide, silica gel, quartz flour, wood flour, gypsum In particular, it may be provided that the plate material has a flameproofing agent. In particular, thermoplastics also offer the advantage that the products made from them can be recycled very easily. It is also possible to use recycled materials from other sources. This results in a further possibility for reducing the production costs.

According to a preferred embodiment of the method, structured carrier plates are used. In this case, the support plates on at least one part surface to be decorated with a three-dimensional structuring, which, for example, the surface structure of a natural material, such as wood, is modeled. The structuring can already be introduced directly during the production of the carrier plate, in which the plate material is extruded, for example, directly structured or the carrier plates are in a subsequent step by suitable means, we structured rolls or stamp, structured, this structuring also immediately after can be made by extruding.

In particular, it is preferred that the application of the decoration takes place in accordance with the structuring of the carrier plate, in order to obtain as faithful a replica of a natural material as possible. It may be provided that the structuring of the carrier plate by means of suitable optical methods and an alignment of the pressure tool and the carrier plate to each other in dependence on the detected structuring. For aligning the compression tool and the carrier plate to one another, it may be provided that a relative movement between the pressure tool and the carrier plate necessary for alignment takes place relative to one another by a displacement of the carrier plate or by a displacement of the pressure tool.

According to a further embodiment of the method, it is provided that a structuring of the wall or floor plate after the application of the cover and / or wear layer takes place. For this purpose, it may preferably be provided that as cover and / or Wear layer, a radiation-curable composition is applied and irradiation with the curing process inducing radiation only to the extent that only a partial hardening of the cover and / or wear layer takes place. In the thus partially cured layer, a desired surface structure is impressed by means of suitable tools, such as a hard metal structural roll or a stamp. The embossing is preferably carried out in accordance with the decor applied to the primer layer. In order to ensure sufficient conformity of the structure to be introduced with the decor, provision may be made for the carrier plate and the embossing tool to be aligned with one another by corresponding relative movements. Following the introduction of the desired structure into the partially cured cover and / or wear layer, a further hardening of the now structured covering and / or wear layer takes place in particular by further irradiation of the layer with electromagnetic radiation or electron radiation. According to a further embodiment of the method, it can be provided that at least partial steps of the method are carried out under an inert gas atmosphere. In particular, it may be provided that the process step of bringing on the decor under an inert gas atmosphere is performed. Suitable inert gases are, for example, nitrogen, carbon dioxide, noble gases or mixtures of these.

Moreover, the invention relates to a wall or floor panel, comprising a plate-shaped support, a primer layer, optionally a printing substrate and a decorative layer, wherein the primer layer comprises a polyurethane acrylate. In one embodiment of a wall or floor panel according to the invention, the primer layer has a layer thickness between> 50μπι and <lmm, preferably between> 100μηι and> 800μπι on. According to a further embodiment of the inventive wall or floor panel, the decorative layer is formed essentially of a radiation-curable dye or ink layer. In this case, the decorative layer, for example, a layer thickness between> 50μπι and <lmm, preferably between> 100μηι and <800μιη have.

On the decorative layer, a cover or wear layer may be applied. It may be provided in particular that the cover or wear layer is formed of radiation-cured paint. The cover or wear layer may, for example, have a layer thickness between> 100 μm and <5 mm, preferably between> 0.5 mm and <2.5 μm.

The invention is explained below with reference to a figure and an embodiment. Fig. 1 shows schematically a structure of a fiction, contemporary wall or floor panel.

Fig. 1 shows a schematic structure of an embodiment of a wall or floor panel (100) according to the invention. The panel consists of a plate-shaped carrier (110). The carrier (110) consists of an extruded plastic material such as polyethylene (PE), polypropylene (PP), polyamides (PA), polyurethanes (PU), polystyrene (PS), acrylonitrile-butadiene-styrene (ABS), polymethyl methacrylate (PMMA ), Polycarbonate (PC), polyethylene terephthalate (PET), polyetheretherketone (PEEK) or mixtures or copolymers thereof. In the carrier (110) are introduced by means of suitable tools a natural wood material modeled surface structures (111). On the plate-shaped support (110), a primer layer (120) is applied, which has a radiation-cured polyurethane acrylate. Optionally, a print substrate (160) is applied to the primer layer (120) by applying a resin composition which is between> 5 wt% and <85 wt%, preferably between> 10 wt% and <80 Wt .-% of a solid having a mean grain diameter ds ₀ between> 0.1 μπι and <120 μηι, as shown in Figure 2. On the primer layer (120) or optionally on the printing substrate (160), a decorative layer (130) by means of suitable printing processes, such as digital printing, flexographic printing or offset printing applied. To increase the wear resistance, a cover layer (140) and / or hard-wearing wear layer (150) is applied to the decorative layer (130), wherein the cover and / or wear layer (140, 150) are formed in particular by a radiation-hardened lacquer layer.

example 1

A primer composition comprising an aliphatic urethane acrylate prepolymer in an amount of 20-35 g / m ^{2 is} applied to a plate-like surface-structured support made of a polyurethane material and irradiated with a mercury vapor lamp at a power of about 3 W / cm ² and an exposure time of approx 10s hardened. On the thus prepared primer layer, in accordance with the structure of the support plate, a decorative layer is applied by means of an inkjet method using a UV-curable ink. Immediately after the ink application of the UV-curable ink, the decorative layer is irradiated with a UV light source of suitable wavelength. After irradiation of the decorative layer and sufficient curing of the same to avoid bleeding or smearing of the applied decoration, there is a stacking of the plates before further processing. Subsequently, a cover and / or wear layer is applied to the decorated support plate, which is formed from a radiation hardened lacquer layer, in which corundum particles are introduced.

Claims

claims  1. A method for producing a decorated wall or floor panel, comprising the method steps  a) providing a plate-shaped carrier,  b) applying a primer at least to the surface of the plate-shaped carrier to be printed,  c) applying a decoration by means of printing on at least a part of the surface treated with the primer,  characterized in that a liquid radiation-curable mixture based on a urethane acrylate is used as the primer. 2. The method of claim 1, wherein the method prior to step c) and in particular after step b) the further method step e) applying a resin composition, which between> 5 wt .-% and <85 wt., Preferably between> 10 wt .-% and <80 wt .-% of a solid having a mean grain diameter ds ₀ between> 0.1 μιη and <120 μιη. 3. The method of claim 2, wherein according to method step e) a resin composition is applied, which comprises a hardener, wherein the hardener in the resin composition in a concentration between> 0.05 wt .-% and <2.0 wt .-%, preferably> 0.15 wt .-% and <1.0 wt .-% is contained. 4. The method according to any one of claims 2 or 3, wherein according to process step e) a resin composition is applied, which as solid at least one compound of the group consisting of titanium dioxide, barium sulfate, barium oxide, Barium chromate, zirconium (IV) oxide, silica, aluminum hydroxide, alumina, iron oxide, ferric hexacyanoferrate, chromium oxide, cadmium oxide, cadmium sulfide, cadmium selenite, cobalt oxide, cobalt phosphate, cobalt aluminate, Vanadium oxide, bismuth vanadium oxide, tin oxide, copper oxide, copper sulfate, copper carbonate, lead antimonate, lead chromate, lead oxide, lead carbonate, calcium carbonate, calcium sulfate, calcium aluminate sulfate, zinc oxide, zinc sulfide, arsenic sulfide, mercury sulfide, carbon black, graphite, or mixtures thereof. 5. The method according to any one of claims 2 to 4, wherein according to method step e) a resin composition is applied, which as a resin component at least one compound selected from the group consisting of melamine resin, formaldehyde resin, urea resin, phenolic resin, epoxy resin, unsaturated polyester resin, diallyl phthalate or mixtures this has. 6. The method according to any one of the preceding claims, comprising the method step  d) applying a wear and / or cover layer on the printed surface. 7. The method according to any one of the preceding claims, wherein the depression is effected by means of digital printing. 8. The method according to any one of the preceding claims, wherein the printing is effected by means of a radiation-curable ink and / or ink. 9. The method according to any one of claims 6 to 8, wherein a hardstoffhaltiger radiation and / or thermosetting paint is applied as a wear layer. 10. The method according to one of the preceding claims, wherein a support based on thermoplastic material or a wood-plastic composite material (WPC) is provided. 11. The method according to any one of the preceding claims, wherein as a carrier, a structured plate-shaped material is provided. 12. The method according to claim 11, wherein the printing is carried out in accordance with the structuring of the carrier material. 13. The method according to any one of the preceding Anspiüche, wherein the wear and / or cover layer is structured after application. 14. The method according to claim 13, wherein the wear and / or cover layer is partially cured before structuring. 15. wall or floor panel (100), comprising a plate-shaped support (110), a primer layer (120), optionally a printing substrate (160) and a decorative layer (130), characterized in that the primer layer (120) comprises a polyurethane acrylate.