Method for producing at least one carrier material provided with a printed decoration

Abstract

The present invention relates to a method for producing at least one carrier material provided with a printed decoration, wherein the printed decoration is applied to at least one carrier material by means of digital printing, wherein the water-soluble CRYK ink for digital printing has: color portion C: at least one cyan pigment; color portion K: at least one black carbon pigment; color portion Y: at least one yellow pigment; or a mixture of at least two different yellow pigments or a mixture of at least one yellow pigment and at least one red pigment; color portion R: at least one red pigment, or a mixture of at least two different red pigments or a mixture of at least one red pigment and at least one yellow pigment.

Description

Technical Field

[0001] The invention relates to a method for producing a carrier material provided with a printed decoration, in particular a printed paper or a printed material sheet, using a water-soluble digital printing ink. Background Art

[0002] Carrier materials provided with decoration, for example wood-based panels are usually used as floor covering elements or for facing walls and ceilings. For this reason, wood-based panels used as carrier materials were usually covered with decorative papers in the past, wherein no restrictions were set to the diversity of different decorative papers decorated with patterns.

[0003] As an alternative to applying decorative papers to wood-based panels, direct printing of the wood-based panels as carrier material has been developed in the past, since printing of paper and subsequent gluing or direct lamination of the paper onto the wood-based panels is dispensed with.

[0004] The printing technologies mainly used in this context are gravure printing methods and digital printing methods. The gravure printing method is a printing technology in which the elements to be mapped are present as recesses in a printing plate, which is colored before printing. The print color is mainly located in the recesses and is transferred to the object to be printed, for example a carrier material, due to the pressure and adhesion of the printing plate. In digital printing, on the other hand, the print image is transferred directly from a computer to a printer, for example a laser printer or an inkjet printer. The use of a static printing plate is omitted here.

[0005] However, in the course of the technical development of printing technology for a wide variety of carrier materials, digital printing is increasingly being used. Digital printing methods are primarily used in the graphic arts industry, for example in advertising agencies, manufacturers of advertising material or printing companies, but in the meantime they are also becoming more common in other branches of industry. There are various reasons for this, but two main arguments can be seen. Thus, due to the higher resolution, digital printing allows the production of printed images with particularly high quality and also allows a wider range of applications with a high degree of flexibility.

[0006] Today, digital printing is almost exclusively performed using the CMYK color system. The CMYK color model is a subtractive color model, in which the abbreviation CMYK stands for three color components, namely cyan, magenta, yellow and black, namely the process color, as the color depth. With this color system, it is possible to describe color spaces (color gamuts) that meet a wide variety of requirements from a wide variety of fields.

[0007] Although the CMYK color space is a compromise, it has the effect that certain colors either cannot be produced at all or that additional colors must still be used for this purpose. This problem occurs in particular when reproducing wooden decorations in the furniture or laminate flooring industry, where different brown shades must be produced. Summary of the invention

[0008] The technical problem underlying the present invention is therefore to provide a method for producing decorative prints with the same or similar perceived quality on different carrier materials while avoiding metamerism, wherein good reproduction of the warm-appearing wood decoration is ensured on all carrier materials.

[0009] According to the invention, this object is achieved by a method having the features of claim 1 .

[0010] Accordingly, a method is provided for producing at least one carrier material provided with a printed decoration, wherein the printed decoration is applied to the at least one carrier material by means of digital printing, for example using an inkjet printing method.

[0011] According to the present invention, the ink used for digital printing is a water-soluble CRYK ink having the following ingredients:

[0012] - Color share C: at least one cyan pigment;

[0013] - Color component K: at least one black carbon pigment;

[0014] - Color component Y: at least one yellow pigment; or a mixture of at least two different yellow pigments or a mixture of at least one yellow pigment and at least one red pigment;

[0015] - Color component R: at least one red pigment, or a mixture of at least two different red pigments or a mixture of at least one red pigment and at least one yellow pigment;

[0016] CRYK inks which have only one yellow pigment as color component Y and only one red pigment as color component R are excluded.

[0017] Accordingly, the method uses digital printing inks in which, for example, only the color portion Y, only the color portion R, or only the two color portions Y and R are modified. In particular, the magenta color commonly used in inkjet inks is replaced by the color portion R in the form of a mixture of red and yellow pigments, and the color portion Y is replaced by a mixture of yellow and red pigments. The digital printing ink set always consists of only 4 colors, as this is determined by the digital printer. Nevertheless, it is still possible to adjust the digital printing colors in a targeted manner by mixing different color pigments and processing them in the digital printing ink. It should be noted that orange pigments, such as PO71, are not used and are therefore excluded.

[0018] With the aid of such an ink composition, it is now possible to provide decorations on different carrier materials which are shifted in the color space towards orange-red.

[0019] The method makes it possible to provide decorative papers for furniture, floor panels and high-pressure laminates and laminate panels with the same decoration and the same color effect, ie furniture, floors and edges whose decoration and color scheme match one another.

[0020] In EP 2 865 528 B1, CRYK inks are used to print paper substrates. In addition to cyan pigments and carbon black pigments, this CRYK ink also contains a red pigment PR254 and a yellow pigment PY151 as color components Y. However, no particular emphasis is placed on the use of mixtures as color components R and / or color components Y. However, the disadvantage of using PR254 and PY151 alone in the printed decoration of different carrier materials for use in the furniture and laminate flooring industries is the only insufficient color shift towards orange-red and the relatively high cost of these pigments. Therefore, with the inks described in EP 2 865 528 B1, only insufficient coverage of the orange-red color component is possible in digital printing. However, this color space is very important for providing warm tones for the furniture industry.

[0021] On the contrary, for the color portions R and Y in the printing ink, a mixture or combination of red and yellow pigments is used according to the invention to achieve the desired shift in the color space while increasing the orange-red color portion. This color space is adapted to the warmer wood decoration in analog printing or gravure printing. It should be noted that at least 5 primary colors are usually used in analog printing methods, while digital printing is limited to 4 primary colors. Therefore, it is possible to use this larger color space in analog printing and digital printing with the help of current inks, without changes that may lead to undesirable metamerism effects. Now, on the one hand, white-primed artificial boards and on the other hand, white-primed paper can be used as carrier materials. If the same decoration is printed on these two carrier materials with the help of a color set with the mentioned pigments, metamerism is largely avoided. At the same time, costs are reduced.

[0022] In one embodiment of the ink used in the present case, the color component Y is a mixture of two yellow pigments, or a mixture of a yellow pigment and a red pigment, or a mixture of two yellow pigments and a red pigment.

[0023] Currently, PY150, 151, 154, 175, 180 or 194 can be used as yellow pigment, of which PY150 and PY181 are preferred. PY181 and PY151 are benzimidazolone azo pigments, but PY181 has different substituents from PY151. Thus, PY181 contains an aminobenzene side chain as the R4 substituent, while PY151 has only one hydrogen at the same position. PY181 has good acid-base stability and solvent stability and is easy to disperse.

[0024] In a preferred embodiment, the color component Y is a mixture of a first yellow base pigment and up to 30% by weight, preferably up to 20% by weight, of a second yellow pigment, in particular a mixture of PY150 and 20% by weight of PY181 (the weight % are each based on the color component Y).

[0025] In another preferred embodiment, the color component Y is a mixture of a first yellow base pigment and up to 10% by weight, preferably up to 5% by weight, of a red pigment, in particular a red pigment selected from quinacridone pigments, in particular a mixture of PY150 and 5% by weight of PR207 (the weight % are each calculated based on the color component Y).

[0026] Red quinacridone pigments belong to a group of organic pigments derived from the basic structure of the quinacridone group. They have very good weather resistance, high color strength and high chemical resistance. The red pigment used is preferably selected from: 2,9-dimethylquinacridone (Pigment Red 122), 2,9-dichloroquinacridone (Pigment Red 202), mixed crystals composed of quinacridone and 4,11-dichloroquinacridone (Pigment Red 207) and 3,10-dichloroquinacridone (Pigment Red 209). It is particularly preferred to use the red pigment PR207 as a mixed crystal composed of quinacridone and 4,11-dichloroquinacridone. Mixed crystals should be understood as solid solutions that are different from pure physical mixtures of individual components. In a solid solution, for example, the molecules of one component are built into the crystal lattice of another component. PR207 is described as yellow-red.

[0027] In another preferred embodiment of the ink currently used, the color component Y is a mixture of a first yellow base pigment, up to 20% by weight, preferably up to 15% by weight, of a second yellow pigment and up to 10% by weight, preferably up to 5% by weight, of a red pigment, in particular a red pigment selected from quinacridone pigments, in particular a mixture of PY150, 15% by weight of PY181 and 5% by weight of PR207 (the weight % are each calculated based on the color component Y).

[0028] In another embodiment of the ink used in the present case, the color component R is a mixture of two red pigments, or a mixture of a red pigment and a yellow pigment, or a mixture of two red pigments and a yellow pigment.

[0029] Thus, in a variant it can be provided that the color fraction R is a mixture of a first red base pigment and up to 60% by weight, preferably up to 50% by weight, of a second red pigment, in particular a red pigment selected from quinacridone pigments, in particular a mixture of PR254 and 50% by weight of PR207 (the weight % are each calculated based on the color fraction R).

[0030] The red pigment PR254 belongs to the class of diketopyrrolopyrrole pigments and is described as yellow-red. PR254 is preferably used in automotive paints. However, other red pigments can also be used instead of PR254, for example PR266, 122, 202, 207.

[0031] In another embodiment variant of the digital printing ink currently used, the color fraction R is a mixture of red pigments, especially red pigments from quinacridone pigments, and yellow pigments, especially a mixture of PR207 and PY181. The amount of PY181 is 5% by weight to 15% by weight, preferably 6% by weight to 10% by weight (weight % in each case based on color fraction R).

[0032] In a further embodiment variant of the currently used digital printing ink, the color fraction R is a mixture of a first red base pigment, up to 60%, preferably up to 50%, of a second red pigment, in particular a red pigment from quinacridone pigments, and a yellow pigment, in particular a mixture of PR254, 50% by weight of PR207 and PY181. The amount of PR207 is about 50% by weight, the amount of PY181 is 3% to 10% by weight, preferably 3% to 5% by weight (the weight % are each calculated based on the color fraction R).

[0033] Current CRYK digital printing inks can be used in the following combinations of color components R and Y, wherein at least one cyan pigment is present as color component C and at least one black carbon pigment is present as color component R:

[0034] a) Color share Y: a mixture of two yellow pigments; Color share R: a red pigment;

[0035] b) color component Y: a mixture of a yellow pigment and a red pigment, in particular a red pigment selected from quinacridone pigments; color component R: a red pigment;

[0036] c) color component Y: a mixture of two yellow pigments and one red pigment, in particular a red pigment selected from quinacridone pigments; color component R: a red pigment;

[0037] d) color component Y: yellow pigment; color component R: a mixture of two red pigments, wherein one of the red pigments is preferably selected from quinacridone pigments;

[0038] e) Color component Y: a mixture of two yellow pigments; Color component R: a mixture of two red pigments, wherein one of the red pigments is preferably selected from quinacridone pigments;

[0039] f) color component Y: a mixture of a yellow pigment and a red pigment, in particular a red pigment selected from quinacridone pigments; color component R: a mixture of two red pigments, wherein one of the red pigments is preferably selected from quinacridone pigments;

[0040] g) color component Y: a mixture of two yellow pigments and one red pigment, in particular a red selected from quinacridone pigments; color component R: a mixture of two red pigments, wherein one of the red pigments is preferably selected from quinacridone pigments;

[0041] h) color component Y: yellow pigment; color component R: a mixture of two red pigments and one yellow pigment, wherein one of the red pigments is preferably selected from quinacridone pigments;

[0042] i) Color component Y: a mixture of two yellow pigments; Color component R: a mixture of two red pigments and one yellow pigment, wherein one of the red pigments is preferably selected from quinacridone pigments;

[0043] j) Color component Y: a mixture of a yellow pigment and a red pigment, in particular a red pigment selected from quinacridone pigments; Color component R: a mixture of two red pigments and a yellow pigment, wherein one of the red pigments is preferably selected from quinacridone pigments;

[0044] k) Color component Y: a mixture of two yellow pigments and one red pigment, in particular a red pigment selected from quinacridone pigments; Color component R: a mixture of two red pigments and one yellow pigment, wherein one of the red pigments is preferably selected from quinacridone pigments.

[0045] Particularly preferred embodiments are listed in Table 1:

[0046]

[0047]

[0048] Table 1

[0049] Other particularly preferred embodiments are listed in Table 2:

[0050]

[0051]

[0052] It should be noted that the different color pigments of the color portion R and the color portion Y are respectively combined or mixed before coating.

[0053] In one embodiment of the ink used in the method, the at least one cyan pigment is a copper phthalocyanine pigment, preferably CI Pigment Blue (PB) 15:3 or CI Pigment Blue 15:4, particularly preferably CI Pigment Blue 15:3.

[0054] In another embodiment of the ink used in the method, the black carbon pigment is a carbon black pigment, in particular selected from: Regal TM 400R、Mogul TM 、L、Elftex TM 320 or DEGUSSA's Special Black FW18, Special Black TM 250、Special Black TM350、Special Black TM 550. Printex TM 25. Printex TM 35. Printex TM 55. Printex TM 90. Printex TM 150T, MA8 and CI Pigment Black (PBL) 7 and CI Pigment Black 11 from MITSUBISHI CHEMICAL.

[0055] The total pigment concentration in the inks used currently is greater than 8% by weight, preferably between 6% and 15% by weight, particularly preferably between 4% and 10% by weight, based on the total weight of the ink. The total pigment concentration does not change much during mixing—only the proportions of the individual pigments change during mixing.

[0056] As already mentioned, the ink currently used is an aqueous ink. The water content in the ink is at least 50%, preferably more than 50%, and particularly preferably at least 55%. For example, it is 51%, 52% or 53%.

[0057] The inks currently used also have a solvent content. Thus, the ink contains at least one organic solvent, the content of which is less than 45%, preferably less than 43%, for example 41%, 42%.

[0058] Organic solvents maintain the processability consistency of the ink, especially when combined with other additives such as dispersing aids. Ethylene glycol or other alcohols such as ethanol can be used as the organic solvent.

[0059] In addition, the inks currently used can contain other additives such as biocides, wetting agents, acids / bases for setting the pH value, surfactants as surface-active substances. In particular, wetting agents can contain: 2-pyrrolidone, glycerol and 1,2-hexanediol in an amount of between 0.1% and 25% by weight, based on the total weight of the aqueous inkjet ink.

[0060] As already mentioned above, different carrier materials can be printed using the method.

[0061] Therefore, in one embodiment, at least one carrier material to be printed is at least one base paper. Base paper is understood here as paper that is neither subjected to gluing in the material nor to surface impregnation with resin or glue. Base paper is essentially composed of cellulose, pigments and fillers and common additives. Softwood pulp, hardwood pulp or a mixture of these two pulp types can be used to produce base paper, such as decorative paper. Inorganic color pigments, such as metal oxides, metal hydroxides and metal oxide hydrates, metal sulfides, metal sulfates, metal chromates and metal molybdates, as well as organic color pigments and / or dyes, such as carbonyl colorants, cyanine colorants, etc. can be used for coloring base paper.

[0062] In a preferred embodiment, the base paper to be printed is at least one paper web which is not impregnated with at least one ink-absorbing layer. The ink-absorbing layer is preferably a hydrophilic coating which contains a water-soluble or water-dispersible polymer or binder and an inorganic pigment.

[0063] For example, polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl acetate, starch, gelatin, carboxymethyl cellulose, ethylene / vinyl acetate, styrene / acrylate copolymers or mixtures thereof can be used as binders.

[0064] The ink absorbing layer may contain an inorganic white pigment such as silicate, kaolin, calcium carbonate, aluminum hydroxide, talc, titanium dioxide, or a color pigment such as iron oxide, carbon black as an inorganic pigment, or may contain an organic color pigment. In the ink absorbing layer, the ratio of the pigment to the binder is between 1:0.05 and 1:1 based on the solid content.

[0065] In a preferred embodiment, the ink absorbing layer contains silicate, aluminum oxide, aluminum hydroxide or aluminum silicate, and contains polyvinyl alcohol as a water-soluble polymer binder.

[0066] The weight of the ink absorbing layer can be 0.5g / m 2 and 20g / m 2 between.

[0067] In another embodiment, at least one carrier material to be printed is at least one pretreated impregnated paper. Pretreated paper (or cellulose ply) is understood here to be paper or paper web impregnated with a resin solution. The paper can be impregnated with a variety of resin solutions, for example melamine resins and urea resins, plastic-acrylate compounds or starch glues. It is also possible to impregnate the paper with resin powder. The use of resin powder will be described in detail below.

[0068] In a preferred embodiment variant, an impregnation paper is used which is provided by means of the following method steps (see also EP 2 980 313 A1): a) completely impregnating the cellulose ply with a hardenable resin, for example melamine-formaldehyde resin, b) removing excess resin formed on the surface (for example by peeling off or scraping off), c) drying the impregnated cellulose ply so that after evaporation of the water from the resin, the cellulose fibers are at least partially exposed on the surface from which the resin has been removed.

[0069] By peeling or scraping off, the resin left on the surface of the cellulose ply ends up at the fiber tips. During the drying process, the resin is pulled back into the fibers so that the fibers are impregnated with the resin but not surrounded by it. This surface is suitable for printing with water-based digital printing inks.

[0070] The special device for peeling off or scraping off works in a similar way to a doctor blade machine, in which one or more rollers run backwards on the paper and absorb the excess resin. The different speeds of the rollers enable the amount to be precisely controlled and reproducibility to be ensured.

[0071] In order to improve the printing result, the treated paper (base paper with or without ink-absorbing layer, impregnated paper) can additionally be provided with a primer material.

[0072] Water-based synthetic resins or acrylate resin dispersions which are completely miscible with water or partially soluble in water can be used as primer materials. The primer materials should have a low solvent content of less than 3%.

[0073] As described above, the printed decoration is applied to the carrier material in direct printing by means of a digital printing method using the above-mentioned CRYK ink. In digital printing, the print image is transferred directly from the computer to the printer, for example an inkjet printer. The decoration data are compiled into machine data by software (for example RIP software from the manufacturer Colorgate).

[0074] After printing, the printed paper (base paper or impregnated paper) can be provided with a resin layer as a protective layer. The protective layer can consist of a resin that has not yet completely hardened, preferably a formaldehyde-containing resin, particularly preferably a melamine-formaldehyde resin, a urea-formaldehyde resin and / or a melamine-urea-formaldehyde resin, or a radiation-hardenable acrylate, preferably a polyester acrylate, a polyether acrylate, a urethane acrylate, hexanediol diacrylate or a mixture thereof. The protective layer serves to protect the printed decoration and to enable temporary storage.

[0075] As mentioned, the applied protective layer has not yet completely hardened, which is controlled in particular by the drying process.

[0076] In particular, all impregnated papers must have a residual moisture content, regardless of the intended use. This allows for a product of uncompromising quality, regardless of the type of further processing (short-cycle press, continuous press or multi-day press). The residual moisture is an indicator of the degree of crosslinking of the synthetic resin used.

[0077] The resins used for impregnation of the paper plies (or for direct coating of other carrier sheets, see below) undergo different states of polymerization and crosslinking in these processes.

[0078] This is illustrated below on the basis of the melamine-formaldehyde resins frequently used in the production of wood-based panels.

[0079] Melamine and formaldehyde react firstly with formation of methylol groups on the amino groups of melamine to form water-soluble products (see Scheme I).

[0080]

[0081] Scheme I

[0082] After addition of a suitable catalyst, preferably an acid, these melamine-formaldehyde monomers undergo polycondensation, which results in bonding of the monomers via ether and methylene groups and in the formation of higher molecular weight precondensates and polycondensates (see Scheme II).

[0083]

[0084] Solution II

[0085] The difference between precondensates and polycondensates lies in their molar mass and their solubility. Thus, low molecular weight precondensates still have limited water solubility, while higher molecular weight polycondensates are insoluble. The limited water solubility of the precondensates is caused in particular by the still free methylol groups and the low degree of crosslinking of the mostly still linear oligomers. Precondensates are therefore polymeric intermediates.

[0086] When the polycondensate is fully cured, strong crosslinking occurs, cleaving off the methylol groups still present, with a densely crosslinked plastic being formed via the methylene groups (see variant III).

[0087]

[0088] Scheme III

[0089] Therefore, the following resin phases are distinguished among synthetic resins which harden via a condensation reaction:

[0090] -A state: easily soluble in solvents, meltable, and hardenable;

[0091] -B state: only partially soluble in solvent, meltable, hardenable;

[0092] -C state: insoluble, hardened.

[0093] When using impregnated paper plies to refine wood-based panels, for example, into high-quality floor panels, it is desirable that the impregnating resin has not yet completely hardened, but is preferably still in the partially crosslinked state B. This still allows flow / filming in conjunction with further crosslinking of the synthetic resin during further processing in the press. Accordingly, the now impregnated and printed paper is preferably dried to state B.

[0094] The printed and optionally coated or impregnated paper can then be pressed together with the material panel, at least one protective paper (covering layer) and optionally a balancing paper.

[0095] In another embodiment, at least one carrier material to be printed is at least one material board, in particular a wood-based board, such as MDF and HDF boards made of wood fibers, particle boards made of wood particles, OSB made of wood strips, wherein the wood fibers, wood particles and wood strips are mixed with a suitable binder and hot pressed, WPC boards, plastic boards, such as SPC (stone plastic composite) or cement fiber boards. For example, carrier materials such as wood materials, wood-plastic mixtures, WPC, plastics, or mixtures of different plastics such as PE, PP, PVC, PU are suitable for direct printing, all with fillers such as chalk, talc or fibers.

[0096] In an embodiment variant, the surface of the material sheet can be pretreated before printing to improve the adhesion of subsequent layers. This can be cleaning with a brush, grinding to remove surface unevenness, and / or plasma or corona treatment.

[0097] In one embodiment, unground wood-based panels, in particular MDF or HDF, which are also provided with a pressure skin (anti-corrosion layer) on the top side can also be used. A water-based melamine resin is applied to the top side in order to fill the pressure skin. The melamine resin is later melted in a short-cycle press and thus has a tempering effect in the region of this layer; that is, it resists delamination.

[0098] In a preferred embodiment, at least one primer is applied in a next step to increase the covering power.

[0099] The primer layer preferably comprises casein, corn starch or soy protein and can contain inorganic color pigments and thus serves as a primer layer for the decorative layer to be printed subsequently.

[0100] In turn, white pigments such as titanium dioxide TiO2 can be used as color pigments. Other color pigments can be calcium carbonate, barium sulfate or barium carbonate, but also iron oxide pigments (for brown primers). In addition to color pigments and casein, corn starch or soy protein, the primer can also contain water as a solvent.

[0101] The amount of liquid primer applied can be 10g / m 2 and 50g / m 2 Between, preferably between 15g / m 2 and 30g / m 2 Between, especially preferably between 20g / m 2 and 25g / m 2 between.

[0102] It is also conceivable that the primer consists of at least one, preferably at least two or more successively applied layers or coatings (for example up to five coatings), wherein the coating amounts between the layers or coatings are the same or different, that is, the coating amount of each individual layer may vary.

[0103] The primer can be applied to the material carrier sheet using a roller and then dried. It is also possible to apply the primer to the material sheet by means of digital printing. In this case, preferably water-based inks rich in white color pigments are used, which are suitable for the digital printing inks used later. Application by means of digital printing is advantageous because the printing equipment is significantly shorter than roller equipment, thus saving space, energy and costs.

[0104] In another embodiment variant of the method, a primer layer is applied to the primer layer, preferably as a one-time coating, and then dried. The amount of liquid primer applied is between 10 g / m 2 and 30g / m 2 Between, preferably between 15g / m 2 and 20g / m 2 Polyurethane-based compounds are preferably used as primers.

[0105] After the primed material sheet has been printed in digital printing with the above-described CRYK ink, the decorative layer can likewise be provided with a protective layer (as described above for paper).

[0106] The protective layer can contain a formaldehyde-containing resin (in state B, see above), in particular a melamine-formaldehyde resin, a urea-formaldehyde resin or a melamine-urea-formaldehyde resin and glass spheres (size 50 μm to 150 μm) as optional spacers for temporary storage of the board. The protective layer serves to temporarily protect the decorative layer for storage before further refining. The protective layer on the decorative layer has not yet completely hardened, but has a certain residual moisture of about 10%, preferably about 6%, and can still be further crosslinked. Therefore, in the case of temporary storage, the resin remains in state B (not yet completely hardened and crosslinked), in which the decoration is protected. The glass spheres can be added to the resin or sprinkled into the resin and serve as spacers. Such a protective layer is described, for example, in WO 2010 / 112125 A1 or EP 2 774 770 B1.

[0107] Alternatively, it is possible to proceed directly to the next processing step.

[0108] In a further embodiment variant, at least one anti-wear layer is applied to the printed material sheet (with or without a protective layer).

[0109] The wear protection layer can be composed of one or more plies, for example three, four, five or six plies.

[0110] In one embodiment, the anti-wear layer is applied by means of the following steps:

[0111] - applying at least one first resin layer onto the at least one decorative layer on the upper side of the material panel, wherein the solids content of the first resin layer is between 60% and 80% by weight, preferably between 65% and 70% by weight, particularly preferably between 65% and 67% by weight;

[0112] - spreading the wear resistant particles evenly onto the first resin layer on the upper side of the material sheet;

[0113] wherein the first resin layer provided with the wear-resistant particles on the upper side of the material sheet is optionally not dried after application,

[0114] - applying at least one second resin layer onto the first resin layer provided with wear-resistant particles and possibly moistened on the upper side of the material plate, wherein the solids content of the second resin layer is between 60% and 80% by weight, preferably between 65% and 70% by weight, particularly preferably between 65% and 67% by weight;

[0115] - subsequently drying the structure consisting of the first resin layer and the second resin layer in at least one drying device;

[0116] - applying at least one third resin layer, wherein the third resin layer has a solid content of between 60% and 80% by weight, preferably between 65% and 70% by weight, particularly preferably between 65% and 67% by weight, and contains glass spheres;

[0117] - subsequently drying the applied third resin layer in at least one further drying device;

[0118] - applying at least one fourth resin layer, wherein the fourth resin layer has a solids content of between 50% and 70% by weight, preferably between 55% and 65% by weight, particularly preferably between 58% and 62% by weight, and contains glass spheres;

[0119] - subsequently drying the applied fourth resin layer in at least one further drying device;

[0120] - applying at least one fifth resin layer, wherein the fifth resin layer has a solids content of between 50% and 70% by weight, preferably between 55% and 65% by weight, particularly preferably between 58% and 62% by weight, and contains glass spheres;

[0121] - subsequently drying the applied fifth resin layer in at least one further drying device;

[0122] - applying at least one sixth resin layer, wherein the sixth resin layer has a solids content of between 50% and 70% by weight, preferably between 55% and 65% by weight, particularly preferably between 58% and 62% by weight, and does not contain glass spheres;

[0123] - subsequently drying the applied sixth resin layer in at least one further drying device; and - pressing the layer structure in a short-cycle press.

[0124] The resin layer for the wear protection layer is preferably based on aqueous formaldehyde-containing resins, in particular melamine-formaldehyde resins, urea-formaldehyde resins or melamine-urea-formaldehyde resins.

[0125] The resins used preferably contain additives such as hardeners, wetting agents (surfactants or mixtures thereof), defoamers, separation media and / or other components. The wetting agents are used in an amount of 0.1% to 1% by weight in the resin layer. The separation media and smoothing agents are preferably added to the fifth and sixth resin layers in an amount between 0.5% and 1.5% by weight.

[0126] As hardeners, preferably latent hardeners are used, such as alkanolamine salts of acids, for example alkanolamine salts of sulfonic acids (see DeuroCure from the manufacturer Deurowood). The latent hardener is preferably added to the resin directly upstream of the coating device in order to avoid premature hardening of the resin and thus losses. Accordingly, preferably no central mixing of the hardener takes place, but rather only variable amounts of hardener are mixed in at the corresponding coating device. This has the advantage that in the event of a malfunction in the facility, the resin can remain in the pipeline longer without hardener. Only the system pot life of the coating device with the resin hardener must be set in a targeted manner. Losses caused by the resin hardener having to be pumped out in the event of a shutdown / malfunction can thus be significantly reduced.

[0127] The proportion of hardener in the individual resin layers varies and can be between 0.5% by weight and 1.5% by weight, preferably between 0.7% by weight and 1.3% by weight. It is particularly preferred that the proportion of hardener per resin application decreases in the production direction; that is, the proportion of hardener in the lower resin layer is greater than the proportion of hardener in the upper resin layer. By reducing the amount of hardener from the lower resin layer to the upper resin layer, the individual resin layers can be hardened uniformly in the KT press.

[0128] In a variant of the method, the 2 Up to 100g / m 2 , preferably 40g / m 2 Up to 80g / m 2 , particularly preferably 45g / m 2 Up to 60g / m 2 The first resin layer is coated in an amount between . The first resin layer is coated, for example, by means of a grooved coating roller in a first coating mechanism.

[0129] The first resin layer can contain cellulose fibers or wood fibers, preferably cellulose fibers. By adding cellulose fibers, the viscosity of the resin to be applied can be set and the application of the first cover layer to the wood-based panel can be improved. The amount of cellulose fibers applied with the first resin layer can be between 0.1% and 1% by weight, preferably between 0.5% and 0.8% by weight (based on the amount of resin to be applied) or between 0.1 g / m 2 Up to 0.5g / m 2 Between, preferably 0.2g / m 2 Up to 0.4g / m 2 The preferred range is 0.25 g / m 2 The cellulose fibers used with preference have a white color and are present in the form of a fine or granular, slightly hygroscopic powder.

[0130] In another embodiment of the method, particles consisting of corundum (aluminum oxide), boron carbide, silicon dioxide, silicon carbide are used as wear-resistant particles. Corundum particles are particularly preferred. In this case, white corundum (white) with high transparency is preferred, so that the visual effect of the decoration located below is not adversely affected as much as possible. Corundum has an inhomogeneous spatial shape.

[0131] The amount of wear-resistant particles spread is 10g / m 2 Up to 50g / m 2 , preferably 10g / m 2 Up to 30g / m 2 , especially preferably 15g / m 2 Up to 25g / m 2 The amount of wear-resistant particles to be spread depends on the wear level to be achieved and the particle size. Thus, when using particle size F200, in the case of wear level AC3, the amount of wear-resistant particles is between 10 g / m 2 Up to 15g / m 2 In the range between 15g / m 2 Up to 20g / m 2 and in the wear resistance grade AC5 it is between 20g / m 2 Up to 25g / m 2 In the present case, the produced plate preferably has a wear resistance class AC4.

[0132] Wear-resistant particles with particle sizes in the grades F180 to F240, preferably F200, are used. The particle sizes of the grade F180 include the range from 53 μm to 90 μm, the particle sizes of the grade F220 include the range from 45 μm to 75 μm, the particle sizes of the grade F230 include the range from 34 μm to 82 μm, and the particle sizes of the grade F240 include the range from 28 μm to 70 μm (FEPA standard). In a variant, white corundum white F180 to F240 with a preferred main particle range of 53 μm to 90 μm is used as wear-resistant particles. In a particularly preferred embodiment, corundum particles of the grade F200 are used, wherein F200 is a mixture between F180 and F220 and has a diameter between 53 μm and 75 μm.

[0133] The wear-resistant particles should not be too fine (risk of dust formation), but also not too coarse. Therefore, the size of the wear-resistant particles is a compromise.

[0134] In another embodiment, silanized corundum particles can be used. Typical silanizing agents are aminosilanes.

[0135] In another embodiment of the method, the second resin layer to be applied to the upper side of the material panel has a density of 10 g / m 2Up to 50g / m 2 Between, preferably 20g / m 2 Up to 30g / m 2 Between, especially preferably 20g / m 2 Up to 25g / m 2 In general, the amount of the second resin layer is less than that of the first resin layer. In a preferred embodiment, the second resin layer to be applied to the upper side of the material plate does not contain glass spheres.

[0136] The total amount of the first and second resin layers is 50 g / m 2 Up to 100g / m 2 Between, preferably 60g / m 2 Up to 80g / m 2 , especially preferably 70g / m 2 Therefore, in one variant, the amount of the first resin layer is 50 g / m 2 The amount of the second resin layer is 25g / m 2 .

[0137] Since the second coating mechanism entrains loose particles, the wear-resistant particles are enriched in the second resin layer. Therefore, the resin to be coated as the second resin layer can contain 5 to 15 weight %, preferably 10 weight %, of wear-resistant particles.

[0138] As explained above, additional resin layers, ie, the third, fourth, fifth and sixth resin layers are subsequently applied onto the second resin layer and dried after the coating, respectively.

[0139] The amount of the third resin layer applied to the upper side of the wood-based panel can be between 10 g / m 2 Up to 50g / m 2 Between, preferably 20g / m 2 Up to 30g / m 2 , especially preferably 25g / m 2 .

[0140] As described in detail above, the third resin layer contains glass spheres that serve as spacers. The glass spheres preferably used have a diameter of 90 μm to 150 μm. The glass spheres can be applied together with the third resin layer or sprinkled separately onto the third resin layer. The amount of glass spheres is 10 g / m 2 Up to 50g / m 2 , preferably 10g / m 2 Up to 30g / m 2 , especially preferably 15g / m 2 Up to 25g / m 2The formulation preferably consists of about 40 kg of liquid resin plus glass beads and additives. The glass beads can also be present in silanized form. Silanization of the glass beads improves the embedding of the glass beads into the resin matrix.

[0141] The amount of the fourth resin layer (which also contains glass spheres) applied to the upper side of the wood-based panel can be in the range of 10 g / m 2 Up to 40g / m 2 Between, preferably 15g / m 2 Up to 30g / m 2 , especially preferably 20g / m 2 .

[0142] As described in detail above, the solid content of the fourth resin layer (and the fifth and sixth resin layers) is lower than that of the first to third resin layers. The varying solid content of the resin layers to be coated achieves a higher total layer thickness due to the increased solid content in the first to third layers, and on the other hand, ensures that the drying and pressing time is sufficient for the entire structure due to the reduced solid content in the fourth to sixth resin layers.

[0143] The amount of the fifth resin layer applied to the upper side of the artificial board can be 10 g / m 2 Up to 40g / m 2 Between, preferably 15g / m 2 Up to 30g / m 2 As described in detail above, the fifth resin layer also contains glass beads. The glass beads can be applied together with the third resin layer or sprinkled separately on the third resin layer. The glass beads are applied in an amount of 8kg to 10kg per coating unit.

[0144] In contrast, the sixth resin layer to be applied onto the fifth resin layer after drying does not contain glass spheres. The omission of glass spheres in the sixth resin layer ensures that the dried resin layer underneath is not damaged and the surface of the resin structure is not subject to tearing.

[0145] The total layer thickness of the resin layer applied to the wood-based panel can be between 60 μm and 200 μm, preferably between 90 μm and 150 μm, particularly preferably between 100 μm and 120 μm, which is significantly higher than the previous methods that usually achieved layer thicknesses of up to 50 μm.

[0146] In another embodiment, a resin layer is applied to the underside of the material panel together with the second, third, fourth, fifth and sixth resin layers to be applied to the upper side of the material panel.

[0147] Therefore, in one embodiment, a resin layer is also applied to the lower side of the material plate in parallel with the second resin layer on the upper side of the material plate. The amount of the resin layer applied to the lower side of the material plate can be 50 g / m 2 Up to 100g / m 2 Between, preferably 60g / m 2 Up to 80g / m 2 , especially preferably 60g / m 2 The lower resin layer is preferably colored (e.g. brown) to simulate the balancing part. The second resin layer is preferably applied to the upper and lower sides of the material plate in parallel or simultaneously in at least one double coating device (roller coating unit). After the second resin layer is applied, the structure consisting of the first and second resin layers is dried (air-dried) in a first drying device.

[0148] In the same way, the third, fourth, fifth and sixth resin layers are each applied to the carrier plate in a double coating mechanism in parallel on the upper side and the lower side and are each dried after coating.

[0149] The resin layer(s) applied to the underside acts as a compensator. By applying the resin layers in approximately equal amounts to the upper and lower sides of the material plate, it is ensured that the tensile forces acting on the material plate during pressing due to the applied layers cancel each other out. The compensator applied to the underside corresponds approximately to the layer sequence applied to the upper side in terms of layer structure and corresponding layer thickness, but without the addition of glass spheres.

[0150] The resin layer is dried at a dryer temperature between 150° C. and 220° C., preferably between 180° C. and 210° C., in particular in a convection dryer. The temperature is adapted to the respective resin layer and can be varied in the individual convection dryers; for example, the temperature in the second, third and fourth convection dryers can be 205° C., while the temperature in the fifth and sixth convection dryers can each be 198° C. However, other dryers can also be used instead of convection dryers.

[0151] In a pressing step following the final drying step, the drying step is carried out under the influence of pressure and temperature in a short-cycle press at a temperature between 150° C. and 250° C., preferably between 180° C. and 230° C., particularly preferably at 200° C. and at a pressure of 30 kg / m 2 Up to 60kg / m 2 Between, especially preferably 40kg / m 2 Up to 50kg / m 2 The layer structure is pressed under a pressure of between 5 and 15 seconds, preferably between 7 and 10 seconds. In contrast, in the case of decorative paper, 50 kg / m 2 Up to 60kg / m 2 of pressure for 16 seconds.

[0152] Preferably, the coated material sheet is oriented in the short-cycle press according to the markings on the wood-based panel relative to the structured press plate located in the short-cycle press, so that a correspondence is established between the decoration on the wood-based panel and the structure of the press plate to be pressed in. This allows the production of a structure with synchronous decoration. During the pressing, the melamine resin layer is melted and the laminate is formed by a condensation reaction when containing the corundum / glass / fiber components.

[0153] In a further embodiment, the material sheet is processed by means of the following method steps:

[0154] a) applying at least one first layer of at least one powdered resin to at least one side of the wood-based panel and melting the applied at least one layer of powdered resin;

[0155] a1) optionally applying at least one primer layer, which can contain color pigments, in particular white pigments;

[0156] a2) optionally applying at least one primer layer;

[0157] b) applying at least one printed decoration or decorative layer by means of digital printing using the above-mentioned CRYK ink; and

[0158] c) applying at least one further (second) layer of at least one powdered resin onto the at least one printed decorative layer and melting the at least one layer of powdered resin spread onto the decorative layer.

[0159] In one embodiment of the method, the powdered resin is 10 g / m 2 Up to 50g / m 2 , preferably 15g / m 2 Up to 30g / m 2 , especially preferably 20g / m 2 Up to 25g / m 2 The amount of resin powder applied to the artificial board. The amount of resin powder applied is basically applicable to all resin powder layers to be applied, wherein the resin powder layers can be adjusted separately. The spreading density is selected here so that a covering layer is generated in each case.

[0160] The particle size of the powdered resin is between 20 μm and 100 μm, preferably between 40 μm and 89 μm.

[0161] In another embodiment of the method, the powdered resin to be applied is a formaldehyde resin, preferably a urea resin, a melamine resin or a phenolic resin, particularly preferably a melamine-formaldehyde resin. Preferably, a melamine resin or a urea-formaldehyde resin is used for the first resin layer. Preferably, only melamine resin is used in the upper layers.

[0162] In the context of the present application, "melting" or "gelling" means that the resin layer has not yet completely polymerized, but rather that the polymerization has stopped at an intermediate stage in which further crosslinking or polymerization is still possible at a later processing point in time. The meaning of "gelling" is therefore usually based on the fact that a further functional layer is applied to the applied protective layer at a later point in time or that the product is to be completed only in a further processing step.

[0163] Other substances can also be added to the melamine resin powder. It is particularly advantageous here that substances which are poorly compatible with the liquid melamine resin can also be used, for example, because they influence salting out, thickening, sedimentation, hardening effects, etc. Such substances can be salts for increasing the electrical conductivity, organic or inorganic flame retardants, cellulose derivatives, free radical scavengers, pigments, UV absorbers, etc.

[0164] Accordingly, the powdered resin used can contain additives such as pigments, conductive substances and cellulose.

[0165] When color pigments are added, the layer consisting of the melted resin powder can simultaneously serve as a white primer for the decorative layer to be printed subsequently. White pigments such as titanium dioxide (TiO2) can be used as color pigments. Other color pigments can be calcium carbonate, barium sulfate or barium carbonate. The proportion of color pigments can be up to 50% by weight of the total powder.

[0166] The addition of color pigments to the first layer of powdered resin can increase the covering power, so that the first layer can be used as the (only) base layer or primer for the subsequent decorative layer.

[0167] In a preferred embodiment, the resin powder is applied by means of electrostatic charging. It is also possible to apply by means of powder coating after a friction method. In this case, friction charging of the powder to be applied is achieved.

[0168] The applied layer of powdered resin can be melted by means of IR radiators or microwave systems etc. The use of IR radiators is particularly preferred.

[0169] The additional powder resin layer applied and fused in step c) of the method preferably comprises a powder based on formaldehyde resin, particularly preferably melamine-formaldehyde resin. The amount of the resin powder film applied in this step is between 10 g / m 2 and 50g / m2 Between, preferably between 20g / m 2 and 40g / m 2 between.

[0170] In another embodiment, the wear-resistant particles are evenly spread onto the decorative layer or onto the resin powder layer applied in step c) (step d).

[0171] In a further embodiment of the method, at least one third layer of at least one powdered resin is applied (step e), in particular onto the layer of wear-resistant particles, which serves as a separating layer for blocking the wear-resistant particles.

[0172] The powder resin layer applied and melted in step e) preferably comprises a powder based on formaldehyde resin, particularly preferably melamine-formaldehyde resin. The amount of resin powder applied in this step is between 10 g / m 2 and 50g / m 2 Between, preferably between 20g / m 2 and 40g / m 2 between.

[0173] In another embodiment of the method, glass spheres are sprinkled onto at least one molten third resin powder layer (step f). The glass spheres serve as spacers between the wear-resistant particles and the subsequent press plate. This can at least partially reduce plate wear.

[0174] In a further embodiment of the method, at least one fourth layer of at least one powdered resin is applied to the layer of glass spheres (step g). This layer serves to block the glass spheres and as a stopper layer.

[0175] The fourth powder resin layer applied and melted in step g) preferably comprises a powder based on formaldehyde resin, particularly preferably melamine-formaldehyde resin. The amount of resin powder applied in this step is between 10 g / m 2 and 50g / m 2 Between, preferably between 20g / m 2 and 40g / m 2 between.

[0176] In another embodiment of the method, the layer structure is pressed in a short-cycle press (KT press) (step h). The pressing step is carried out under the influence of pressure and temperature at a temperature between 180° C. and 250° C., preferably between 200° C. and 230° C., particularly preferably at 200° C. and at a pressure of 30 kg / cm 2 and 60kg / cm 2 between 40kg / cm 2 and 50kg / cm 2The pressing time is between 8 seconds and 30 seconds, preferably between 10 seconds and 25 seconds. DETAILED DESCRIPTION

[0177] The present invention is described in detail below based on embodiments.

[0178] Example 1a: Base paper printing

[0179] The base paper (paper weight: 80g / m 2 ).

[0180] The decorative layer was applied by a digital printing method using CRYK ink having the following composition:

[0181]

[0182] Ethylene glycol is preferably used as solvent.

[0183] Printing color is at 5g / m 2 and 10g / m 2 The amount between is applied.

[0184] After printing, the printed paper can be provided with a melamine-formaldehyde resin layer as a protective layer. This protective layer serves to protect the printed decoration and enables temporary storage.

[0185] The paper is subsequently dried in a convection dryer or by NIR (near infrared) to a moisture content of about 6% by weight, so that the resin layer is in the B state.

[0186] Example 1b: Printing of base paper with ink absorption layer

[0187] The base paper (paper weight: 80g / m 2 ). Subsequently, a pigmented (TiO2) ink-absorbing layer (synthetic silicate with polyvinyl alcohol as binder) was applied (layer thickness 40 μm; dry weight after drying at 125° C. 4 g / m 2 ) and a primer layer, and drying the layer structure.

[0188] After drying, a decorative layer was applied to the paper thus obtained (paper weight: 80 g / m 2 ) on the printed color. Printing color is at 5g / m 2 and 10g / m 2 The amount between is applied.

[0189] After printing, the printed paper can be provided with a melamine-formaldehyde resin layer as a protective layer. This protective layer serves to protect the printed decoration and enables temporary storage.

[0190] The paper is subsequently dried in a convection dryer or by NIR (near infrared) to a moisture content of about 6% by weight, so that the resin layer is in the B state.

[0191] Example 2a: Printing of a first impregnation with an ink-absorbing layer

[0192] The paper to be printed is impregnated with liquid melamine resin on the front and back in an impregnation device. Here, about 50 g of melamine resin with a solid content of about 50% is applied per square meter.

[0193] Subsequently, a pigmented (TiO2) ink-absorbing layer (synthetic silicate with polyvinyl alcohol as binder) was applied (layer thickness 40 μm; dry weight after drying at 125° C. 4 g / m 2 ) and a primer layer, and drying the layer structure.

[0194] After drying, a decorative layer was applied to the impregnation thus obtained (paper weight: 80 g / m 2 ) on the printed color. Printing color is at 5g / m 2 and 10g / m 2 The amount between is applied.

[0195] After printing, the printed paper can be provided with a melamine-formaldehyde resin layer as a protective layer.

[0196] The paper is subsequently dried in a convection dryer or by NIR (near infrared) to a moisture content of about 6% by weight, so that the resin layer is in the B state.

[0197] Example 2b: Printing of a second impregnation with an ink-absorbing layer

[0198] With the help of a friction gun, the paper to be printed is coated in a coating device at a dosage of 25 g / m 2 The melamine resin powder contains the usual additives, such as hardeners, separation media, etc. The powder is then melted by infrared radiation.

[0199] Then a pigmented (T1O2) ink-absorbing layer (synthetic silicate with polyvinyl alcohol as binder) (layer thickness 40 μm; dry weight after drying at 125° C. 4 g / m 2 ) and a primer layer, and drying the layer structure.

[0200] After drying, a decorative layer was applied to the impregnation thus obtained (paper weight: 80 g / m 2 ) on the printed color. Printing color is at 5g / m 2 and 10g / m 2The amount between is applied.

[0201] After printing, the printed paper can be provided with a melamine-formaldehyde resin layer as a protective layer.

[0202] The paper is subsequently dried in a convection dryer or by NIR (near infrared) to a moisture content of about 6% by weight, so that the resin layer is in the B state.

[0203] Example 2c: Printing the third dip

[0204] The paper to be printed is impregnated with melamine resin on the front and back in an impregnation device. Here, about 50 g of melamine resin with a solid content of about 50% is applied per square meter.

[0205] Upstream of the dryer, the resin is scraped off on the side of the impregnation to be printed by means of a special device (eg a doctor blade), so that the fibers are exposed to absorb the printer's ink.

[0206] After drying, a decorative layer was applied to the impregnation thus obtained (paper weight: 80 g / m 2 ). Printing pigment is located at 5g / m 2 and 10g / m 2 The amount between is applied.

[0207] No further drying of the printed dip is necessary, since the digitally printed ink introduces only very little moisture.

[0208] Example 3: Printing a plate with a liquid cover layer

[0209] The HDF boards (fiberboards with increased coarse density) are first pre-coated with an aqueous synthetic resin (melamine-formaldehyde resin). The application amount is 20 to 50 g of liquid resin per square meter (solids content: about 55%). The resin contains the usual auxiliaries such as wetting agents, hardeners, separation media and defoamers. The applied resin is then dried in a convection dryer or near-infrared drying oven to a moisture content of about 20%. A water-based, pigmented primer is then applied in multiple layers (5-8 times). After each application, the primer is dried using a convection dryer or near-infrared dryer.

[0210] Next, the primed board is printed with the subject matter using a digital printer. 2 Up to 8g / m 2 Water-based CRYK digital printing ink.

[0211] After the decorative layer has dried, about 70 g of liquid melamine resin (solids content: 55% by weight) containing conventional additives (hardeners, wetting agents, etc.) are applied to the printed plate surface in a first roller coating device. Melamine resin is also applied to the underside of the plate using the first roller coating device (application amount: 60 g of liquid resin per square meter, solids content: about 55% by weight).

[0212] 14 g of corundum (F200) per square meter were then spread onto the surface using a spreading device. Due to the distance of about 5 m from the dryer, the corundum was able to sink into the melamine resin. The board then passed through a circulating air dryer. Then 25 g / m 2 A melamine resin layer (solids content: 55% by weight) was applied in an amount of 50 g of liquid resin per square meter, solids content: about 55% by weight. The melamine resin layer also contained conventional auxiliaries. Melamine resin was also applied to the underside of the board using a roller coating device (application amount: 50 g of liquid resin per square meter, solids content: about 55% by weight). The board was dried again in a circulating air dryer.

[0213] The melamine resin, which additionally contains glass spheres, is then applied to the panel surface. The diameter of the glass spheres is 60 μm to 80 μm. The amount of resin applied is approximately 20 g of liquid melamine resin per square meter (solids content: 61.5% by weight). In addition to the hardener and wetting agent, the formulation also contains a separating agent. The amount of glass spheres applied is approximately 3 g / m 2 . Melamine resin is also applied to the underside of the board using a roller coating device (coating amount: 40 g of liquid resin per square meter, solid content: about 55% by weight). The board is dried again in a circulating air dryer and then coated again with a melamine resin containing glass balls. Cellulose (Vivapur 302) is contained as a further component. About 20 g of liquid melamine resin per square meter are applied again (solid content: 61.6% by weight). Here, about 3 g of glass balls and 0.25 g of cellulose are applied per square meter. In addition to hardeners and wetting agents, the formulation also contains a separating medium. Melamine resin is also applied to the underside of the board using a roller coating device (coating amount: 30 g of liquid resin per square meter, solid content: about 55% by weight). The resin is dried again in a circulating air dryer and then the board is heated at 200° C. and 400 N / cm 2 The molten steel was pressed in a short cycle press under a pressure of 1000 g. The pressing time was 10 seconds. A press plate with a wooden structure was used as a structure generator.

[0214] Example 4: Printing a plate with a powder cover

[0215] In the production line, 8 mm HDF is cut, freed from dust by means of brushes and then transported on via a roller conveyor.

[0216] In the coating equipment, the coating was then applied with a friction gun at 25 g / m 2 The HDF is coated with melamine resin powder in an amount of 1000 g / cm2. The melamine resin powder contains common auxiliary agents such as hardeners, separation media, etc. The powder is then melted by infrared radiation.

[0217] The primed panels are then coated with a color primer in several coats and subsequently dried temporarily (circulating air). The color primer is a mixture of casein and pigment (titanium dioxide). The application amount for each coat is about 5 g of liquid per square meter. The coating is repeated at least five times. The primer is then applied with circulating air drying (application amount: 10 to 20 g of liquid per square meter).

[0218] The plates are then printed with water-based CRYK ink using a digital printer. The ink is applied in quantities of 3 to 15 g of liquid per square meter. The ink is dried via infrared radiation or circulating air.

[0219] The corundum was spread onto the printed part using a spreading device (coating amount: 20 g of corundum per square meter, F180).

[0220] Then, melamine resin powder was applied again with the help of a friction gun (coating amount: 80 g / m 2 ). This melamine resin powder is gelled again with the aid of IR radiators. The melamine resin powder contains common additives such as hardeners, separation media, etc.

[0221] The plate was then pressed together with the equilibrium impregnation in a KT press. Pressing conditions were: T = 200 °C, p = 40 kg / cm 2 and t=25 seconds. The pressed panels were subsequently visually evaluated, showing no anomalies. A subsequent surface inspection according to DIN EN 15468 (August 2018) also showed no anomalies. All requirements of load stress level 32 were met.

Claims

1. A method for producing at least one carrier material provided with a printed decoration, wherein the printed decoration is applied to the at least one carrier material by means of digital printing, The water-soluble CRYK ink used for the digital printing has the following ingredients: - Color share C: at least one cyan pigment; - Color component K: at least one black carbon pigment; - a color share Y and a color share R in the form of one of the following combinations: a) Color share Y: a mixture of two different yellow pigments; Color share R: a red pigment; b) Color component Y: a mixture of a yellow pigment and a red pigment; Color component R: a red pigment; c) Color share Y: a mixture of two yellow pigments and one red pigment; Color share R: one red pigment; d) Color share Y: a yellow pigment; Color share R: a mixture of two red pigments; e) Color share Y: a mixture of two yellow pigments; Color share R: a mixture of two red pigments; f) Color share Y: a mixture of one yellow pigment and one red pigment; Color share R: a mixture of two red pigments; g) Color share Y: a mixture of two yellow pigments and one red pigment; Color share R: a mixture of two red pigments; h) Color share Y: a yellow pigment; Color share R: a mixture of two red pigments and a yellow pigment; i) Color share Y: a mixture of two yellow pigments; Color share R: a mixture of two red pigments and one yellow pigment; j) Color share Y: a mixture of one yellow pigment and one red pigment; Color share R: a mixture of two red pigments and one yellow pigment; and k) Color proportion Y: a mixture of two yellow pigments and one red pigment; Color proportion R: a mixture of two red pigments and one yellow pigment, The different colored pigments of the color portion R and the color portion Y are mixed before coating, And no orange pigment is used in it.

2. The method according to claim 1, characterized in that In combinations b), c), f), g), j) and k), the red pigment in the color share Y is selected from quinacridone pigments, and in combinations d), e), f), g), h), i), j) and k), one of the red pigments in the color share R is selected from quinacridone pigments.

3. The method according to claim 1, characterized in that PY150 and PY181 were used as yellow pigments.

4. The method according to any one of claims 1 to 3, characterized in that When a mixture of two yellow pigments is used as the color component Y, a mixture of PY150 and 20% of PY181 is used.

5. The method according to any one of claims 1 to 3, characterized in that When a mixture of a yellow pigment and a red pigment is used as the color component Y, a mixture of PY150 and 5% of PR207 is used.

6. The method according to any one of claims 1 to 3, characterized in that When a mixture of two yellow pigments and one red pigment is used as the color component Y, a mixture of PY150, 15% of PY181 and 5% of PR207 is used.

7. The method according to claim 1, characterized in that PR207 and PR254 were used as red pigments.

8. The method according to any one of claims 1 to 3, characterized in that When two red pigments are used as color component R, a mixture of PR254 and 50% PR207 is used.

9. The method according to any one of claims 1 to 3, characterized in that When two red pigments and one yellow pigment are used as the color component R, a mixture of PR254, 50% PR207 and PY181 is used.

10. The method according to claim 1, characterized in that The at least one cyan pigment is a copper phthalocyanine pigment.

11. The method according to claim 10, characterized in that The at least one cyan pigment is CI Pigment Blue 15:3 or CI Pigment Blue 15:

4.

12. The method according to claim 10, characterized in that The at least one cyan pigment is CI Pigment Blue 15:

3.

13. The method according to any one of claims 1 to 3, characterized in that The black carbon pigment is a carbon black pigment.

14. The method according to claim 13, characterized in that The carbon black pigment is selected from: Cabot's Regal TM 400R、Mogul TM 、L、Elftex TM 320 or DEGUSSA's Carbon Black FW18, SpecialBlack TM 250、SpecialBlack TM 350、Special Black TM 550. Printex TM 25. Printex TM 35. Printex TM 55. Printex TM 90. Printex TM 150T, MA8 and CI Pigment Black 7 and CI Pigment Black 11 from MITSUBISHI CHEMICAL.

15. The method according to any one of claims 1 to 3, characterized in that The water content in the ink is at least 50%.

16. The method according to claim 15, characterized in that The water content in the ink is at least 55%.

17. The method according to any one of claims 1 to 3, characterized in that The ink contains at least one organic solvent in a proportion of less than 45%.

18. The method according to claim 17, characterized in that The ink contains at least one organic solvent in a proportion of less than 43%.

19. The method according to any one of claims 1 to 3, characterized in that The at least one carrier material to be printed is at least one base paper, at least one pretreated impregnated paper or at least one material sheet.

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