EP2873535A1 - Workpieces with structured decorative surface - Google Patents

Abstract

The invention relates to workpieces with a surface-structured decorative surface in which a graphic decor is printed on a support. Furthermore, the invention relates to an apparatus and a method for producing such workpieces. A workpiece (1) with a surface-structured decorative surface comprises a carrier (5) on which a graphic decoration is printed in at least one printed layer (21/31) which is at least partially covered by at least one lacquer layer (22/32, 23/33, 24 / 34) is covered, wherein a structuring of the decorative surface is formed by a multiple or irregularly executed digital printing and a top decorative layer (26/36) is formed as a full-surface lacquer view.

Description

The invention relates to workpieces with a surface-structured decorative surface, in particular those in which a graphic decor is printed on a support. Furthermore, the invention relates to an apparatus and a method for producing such workpieces.

It is known from the prior art to produce workpieces which are used, for example, as floor coverings, furniture surface parts or for other everyday objects which have a decorative layer which represents, for example, a reproduction of a natural product. In addition to the desire to obtain an identical as possible graphic adjustment with respect to the color, a pattern, etc., there is also the desire to replicate the surface in haptic terms as well as possible. Reproduced or reproduced products and workpieces gain in authenticity for a user and viewer when, in addition to the most perfect graphical representation, a surface structure is as similar as possible to the structure that is found in a "natural product" made of naturally occurring materials ,

For the production of workpieces having a surface representing a reproduction of a natural product, there is a difficulty in that a variety of different manufacturing steps is usually necessary to create the surface decoration until the decorative layer forming the surface of the workpiece is completed is. On the one hand process steps are necessary, which are directed to the graphic appearance of the workpiece, on the other hand process steps are necessary, which provide a surface seal, so that the workpiece and manufactured product and in particular the graphic decor in use protected against damage and wear and other wear is.

In addition, a further difficulty is that workpieces with a natural product replica decorative layer are usually made of different material layers, which have good adhesion to each other and a carrier and / or have to make a connection with each other and with the carrier.

The existing difficulties will be explained here by way of example using the example of the production of panels for a laminate floor.

A starting product for their production is a decorative paper on which a graphic decor is printed in a printing process. Preferably, for example, a wood decor is printed on the decor paper with a gravure printing process. Usually, water-based inks are used. The application of the printing ink leads to a swelling of the decor paper. This causes a change in length and width of the decorative paper. By subsequent drying, the swelling and changes in length and width can ideally be reversed. Subsequently, the printed decor paper is impregnated with an aqueous resin, in particular a melamine-formaldehyde resin and then dried again. Also in the case of re-occurring swelling and re-drying of the decorative paper again occur dimensional changes that lead to measurable changes in the length and width of the paper.

Decisive here is that the dimensional changes occurring of different parameters, such as the composition of the decorative paper used, i. its weight, cellulose content, as well as a pigment content of the printing inks used, an amount of the applied ink, etc. is dependent. In addition, the dimensional changes that occur are also dependent on other parameters during printing and impregnation, for example, an amount of resin application, a drying temperature, a web tension of the decorative paper, etc. The resinated decorative paper, which is referred to as impregnate and usually as a large-scale sheet with dimensions is present, for example, 5,600 mm x 2,100 mm, is then pressed in a short-cycle press using pressure and heat on a wood-based material carrier. In this process step, a surface structure can be embossed into the decorative surface by means of a chromed steel sheet. In the best case, the structure of the chromed steel sheet is derived from the pressure rollers used in the gravure printing process, so that the embossed surface structures are adapted to the graphical representation.

Due to the mentioned dimensional changes and variations of these dimensional changes occurring in the manufacturing process, an exact superimposition of the embossed structure is adapted to the printed graphic structure even with great effort almost impossible. In addition, with the embossing plates of the short-cycle press only for a single graphic decor a decorative identical structuring can be achieved. For all other graphic decors no structurally identical structuring can be achieved by means of this structured steel sheet. Since the production of embossing plates is complicated and expensive, embossing plates are therefore used as a rule, which bring a structuring, which are not adapted to the graphic design of the decor.

A similar problem arises when a surface structuring in painting lines of workpieces is to be brought about. There, it is possible to structure the paint on a structured calender after the order by this is pressed in the paint. Another possibility is to apply with the help of structured paint rollers the paint only at defined locations and to create a structure over it.

Using a textured calender results in the same problems as in press technology because textured calenders can not be made for any décor and typically can not be precisely aligned to a décor, even if the calender adheres to the graphic decor in terms of its texture is adjusted.

When using structured paint rollers, only relatively coarse structures can be produced, which moreover only occur as elevations with respect to a mean decorative layer thickness. In addition, the problem that the paint roller must be adapted to the pressure roller play, in order to achieve a decorative identical structuring, is maintained.

From the DE 10 2009 044 802 For example, a method and an apparatus for producing a three-dimensional surface structure on a workpiece are known. It is provided that a processing station is supplied with a printed image with a decorative image workpiece is sprayed through a plurality of nozzle openings on the surface of the workpiece transparent, radiation-curable paint in the form of paint droplets, wherein the number of paint droplets per unit area and / or Volume of paint droplets is computer controlled according to a digital template. Subsequently, the transparent lacquer is cured by means of radiation. In order to achieve a good adhesion of the paint to the printing ink, it is in many cases necessary to pretreat the surface before applying the paint, for example by applying a primer. This makes the manufacturing process more complicated and expensive.

From the EP 2 218 420 A2 For example, a method and an apparatus for producing a structured surface on a plate-shaped workpiece made of wood-based material are known. On the surface of the workpiece, a wood decor is printed and applied thereto an at least partially optically transparent first coating of paint. With the aid of a digital application device, an at least partially optically transparent second coating of lacquer with a spatially varying distribution of the application quantity is applied to the first coating in such a way that the second coating forms a negative surface structure in the surface structures of the wood decoration which are actually to be reproduced as depressions are formed.

From the EP 1 645 339 A1 is a method for producing structured surfaces on plate-shaped workpieces made of wood-based materials for use as a floor covering or furniture part is known in which on the surface of the workpiece a wood decor is printed and subsequently a first optically transparent lacquer layer is applied as a first coating and by means of a digital application device the first coating is applied a second coating of optically transparent lacquer with a spatially varying distribution of the order quantity. The topmost coating is not fully formed.

The technical object of the invention is to provide an improved method for the production of workpieces, an improved device for producing such workpieces, and also improved workpieces which have a more faithful reproduction of a surface, in particular with regard to their surface relief structure or haptics. have a high durability and are inexpensive and accurate to produce.

The invention is based on the idea of creating workpieces with a structured decorative surface in which structuring is applied by means of a multiple application or uneven application of printing layers with the aid of a digital printing device or a digital printing method. Here is the Surface structuring performed with the same printing device, which also applies the graphically perceptible decor on a support of the workpiece. As the outermost or uppermost layer is additionally applied as a protective layer a full-surface running, locally each forming an approximately equal layer thickness paint layer.

definitions

As digital printing, a printing is designated, in which for each position of a printable surface, the applied printing ink can be determined workpiece individually. This means that different printed images can be produced on positions of the workpieces which correspond to one another in a direct sequence of time, the change in the printed image being able to be brought about without an increased outlay. This distinguishes digital printing methods from other classical printing methods, for example printing methods, in which a correspondingly adapted roller play has to be produced for each printed image. The printed image is described in the form of a digital data record.

As printing ink that material is referred to, which is applied during the printing process on a printed workpiece or a support of the workpiece. Another term for printing ink is printing preparation. Paints, which are applied by means of other application methods on a support of a workpiece, are also referred to here for the sake of standardization as printing inks.

Preferred embodiments

According to a preferred embodiment, a workpiece is provided with a surface-structured decorative surface, which comprises a carrier on which a graphic decor is printed in at least one printed layer which is at least partially covered by at least one lacquer layer, wherein a structuring of the decorative surface formed by a digital printing performed multiple times is and a topmost decorative layer is formed as a paint view over the entire surface. Such a workpiece is preferably manufactured by a method of forming a workpiece having a surface-structured decorative surface, comprising the steps of: providing a carrier; Detecting decor data comprising a graphic decor pattern and relief information; Printing the support to form the graphic Decor pattern with at least one print layer and at least partial application of at least one lacquer layer on the printed with the graphic decor pattern carrier, wherein the graphic decor pattern is performed by a digital print and the carrier by means of digital printing one or more times printed to the graphic decor pattern and the relief structure form on the support, so that the one or more print layers at different positions have different overall thicknesses, of which at least one is laterally structured, so that a total thickness of the printed layers printed varies to set the surface structure of the decorative surface and wherein a top decorative layer formed as a paint view over the entire surface becomes.

The invention is based on the finding that relief printing is also possible by multiple printing or non-uniform application of one or more printing inks on a workpiece surface in addition to graphic decoration. This relief structure is maintained when the printed image thus produced is covered with a uniformly applied lacquer layer.

The surface relief is thus created by a laterally structured printing of the workpiece surface by means of a digital printing process. Similar to a decomposition into different color separations, the relief information provided with the decoration information is used to achieve the three-dimensional structuring of the printed image, which is created by a different digital printing of different locations of the carrier surface. By performing the multiple printing steps with a digital printing device, it is ensured that an exact positioning of the different printing layers is achieved. As a result, an optimal match of graphic decor and three-dimensional structure of the printed image is achieved.

The three-dimensional design can be carried out with printing inks, each comprising pigments. In this case, the graphic print or graphic decor patterns are affected by all applied print layers.

In other embodiments, it is provided that first a printing covering the entire surface with a graphic décor takes place and then laterally structured with transparent or nearly transparent printing inks Printing layers are applied, which cause a height profiling of the entire print image or the decorative surface. Regardless of whether the inks contain pigments or not, a three-dimensional profiling is created in register with the graphic structures, so that an optimal match between 3D relief and optically detectable decor is achieved.

In particular, lacquers can be printed as transparent printing inks. These can be designed so that they convey a high-gloss impression of the finished decorative surface.

In some embodiments, it is provided that a partial or full-surface covering transparent lacquer layer is first printed on the colored printing layers, which are provided essentially for forming the optically detectable decoration. Only then are those applied by means of transparent printing inks, for example also in the form of paints, those three-dimensional profiling pressure layers applied. One advantage is that the printing layers effecting the profiling are arranged closer to a finished surface of the workpiece.

A further particular advantage of the method according to the invention and the device according to the invention is that the relief heights can be formed locally differently and can be determined individually for each workpiece. In some places, a profiling can have larger relief heights by applying more layers of print one above the other. At other positions, a relief structure may have lower relief heights and be made with fewer print layers.

However, a height of the relief structures is not exclusively dependent on the number of printed layers applied, but also decisively on the composition of the applied printing ink and the state of the underlying printing layers or carrier surface.

Furthermore, the local layer thickness of the applied print layer can be influenced by the total amount of printing ink delivered. Depending on the flow behavior of the printed printing ink, this can be an area that is coherent over the entire surface is simply printed, different relief heights are already realized in a single printing. By a multiple printing of individual positions and / or areas as well as the local variation of the delivered ink quantity, a significant height profiling can be formed with only a few print layers.

In order to prevent flow of the printing inks, it can be provided that between the application of successive printing layers drying of the previously applied printing layer is carried out and / or a partial curing, for example via an irradiation of electrons, UV light or the like is effected. However, a complete curing of the ink layer or ink layer applied as a printing ink is not advantageous, since otherwise the pressure layer applied above generally forms a poor bond with the underlying printing layer.

A particular advantage of this method is therefore also that a good connection between the different print layers can be formed by, without the underlying pressure layer has already moved to a state in which an optimal connection training is no longer possible because, for example, one strong drying of the print layer has taken place. This problem occurs in prior art methods.

In particular, according to one embodiment of the method proposed here, it is provided to form a relief structure applied in several layers, which is formed homogeneously in itself, at least with regard to the material structure. This means that in the finished decorative layer, the individual printed layers, which are formed by means of multiple application and / or different thickness application of printing inks, are no longer recognizable in the finished product in a cross-section grinding as layers separated by interfaces. It is understood, however, that the layers may nevertheless be optically distinguishable due to optical properties, for example different admixtures of pigments. With regard to a forming material layer, however, such a distinction is no longer possible with optimally designed decorative layers, as far as the printing inks are all made, for example, on the basis of the same plastic material. One or more full-surface protective layers may, in some embodiments, be different Material be made as the graphic decor and the relief structure forming print layers.

A further advantage of the invention is that workpieces can be produced that comprise a decorative surface with so-called positive relief structures in which there are recessed surface portions in a contiguous surface area that have a decorative layer thickness below the average decorative layer thickness in the surface area, and increased area proportions exist, which have a decorative layer thickness above the average decorative layer thickness in the surface area, wherein the recessed surface portions cover a smaller area portion of the area area than the increased area portions and the recessed area portions form the positive relief structure, for example a wooden pore in a wood decor. However, it is equally possible to produce decorative surfaces which comprise a negative relief structure and thus form a wooden pore with a local raised relief structure in which further recessed surface portions exist in a contiguous further surface areas, which have a decorative layer thickness below an average decorative layer thickness in the further surface area and further increased surface portions exist which have a decorative layer thickness above an average decorative layer thickness in the further surface area, wherein the further recessed surface portions cover a higher area proportion of the further surface area than the further increased surface portions and the further increased surface portions form the negative relief structure, for example a wooden pore. It is understood that the surface area and / or the further surface area must each be chosen or must be chosen such that their area size is at least twice as large as the area of the recessed relief structure or raised relief structure.

There are thus any surface relief structures, as they occur even with natural materials, imitable.

In one embodiment, it is provided to use a printing ink which comprises so-called effect pigments which, for example, have a different optical effect depending on a viewing angle or cause a glittering effect. With the aid of printing inks which have effect pigments, three-dimensional effects, for example of simulated wood pores, can be clearly promoted and / or emphasized.

According to the invention, the workpiece is provided with an uppermost lacquer layer formed over its entire surface, which is or is formed in such a way that the relief structure formed by the plurality of laterally structured printed layers is only covered but not flattened. In this way, a high surface durability can be achieved and, for example, a glossy lacquer surface can be created which nevertheless optimally contains the structuring of the graphic decoration formed as a relief structure.

Such a workpiece is preferably produced with a digital printer, which is particularly preferably designed as a so-called inkjet printer. This comprises for different printing inks in each case at least one print head, which is laterally positionable relative to the workpiece or the carrier on which the decorative surface is applied. In general, the print heads are designed so that they have arranged in a matrix output openings over which at the same time individually a printing ink of the same kind can be delivered. Thus, at the same time a plurality of positions arranged in a grid relative to one another can be acted upon with printing ink of one kind. However, the quantities delivered at the same time may differ from position to position.

Particularly preferably, a plurality of print heads for different printing inks are arranged adjacent to one another and mechanically coupled to one another, so that they are movable together relative to the carrier to be printed. Thus, different inks can be dispensed at different positions by the different printheads at the same time.

The printing apparatus is preferably designed such that the print heads are moved in a meandering manner over the carrier, for example, in order to provide it with a print graphic over the entire area. However, in order to print on the relief structures, it may also be advantageous to move the print heads only selectively to specific positions in order to form the 3D structure.

Particularly advantageously, the printing device is designed so that the printheads can be moved relative to the carrier so that it over any position of the can be positioned as often desired with the decor to be provided surface of the carrier.

In one embodiment of a printing device according to the invention, a plurality of printhead assemblies movable separately relative to the support are provided, each comprising at least one printhead for one or more printheads for different printing inks. As a result, a printing of the carrier can be accelerated. With this device as well, it is ensured that one of the print head arrangements can be positioned as often as desired over each position of the surface of the carrier in order to be able to print any number of print layers on top of one another in order to be able to form the three-dimensional relief structure.

In one embodiment, it is provided that the formation of the plurality of printed layers takes place in such a way that the surface of the carrier is not simultaneously printed with the same printing layer at a time. This means that in a partial region of the surface of the carrier already a plurality of printing layers are applied or may be, before starting at another point of the surface of the carrier with the imprint of the first printing layer.

Especially with large workpiece surfaces, such a procedure can be advantageously used by the carrier is controlled and controlled continuously or incrementally moved relative to the entire printing device. This movement must be controlled with a precision commensurate with the precision with which the digital printing device can reprint the same position at a time when the support is at rest.

If a plurality of printheads or printhead arrangements controlled relative to one another are used, then for example the one or more print layers which completely or mainly define the graphic design of the decorative layer can be printed with a printhead or printhead arrangement. The remaining print heads then preferably print in those areas where the graphic design is completely or mainly finished, printing inks, which form the relief structure essentially and / or cover covering paint layers. As a result, a decorative layer structure can be formed over a large area, which ensures an optimal connection between the individual printed layers, one Accelerated completion and at the same time ensures a high quality in terms of the conformity of the position of the relief structures relative to the graphic decor design.

Particularly preferably, the print heads are each designed such that they can vary the amount of print ink delivered at a position during printing in a controlled manner. As a result, different relief heights can also be generated in a printing layer as a function of the desired relief to be produced.

The fact that the printing device is designed so that any surface position of the carrier can be "driven" by a print head multiple times, a repositioning of the carrier in the printing device is not necessary. This ensures that the different printing layers can each be applied in register with each other, thereby ensuring that the graphically perceptible decoration with the three-dimensional relief structure optimally coincides with respect to the lateral positioning.

Since an immediate printing of the carrier, which may be pretreated with a primer, preferably takes place, no undesired shrinkage processes occur, which are different for the graphic decorating material delivering material from the relief-forming material.

Fig. 1

eine schematische Darstellung einer Vorrichtung zum Herstellen erfindungsgemäßer Werkstücke mit einer Dekorschicht mit Oberflächenrelief;

Fig. 2

eine Draufsicht auf ein Werkstück; und

Fig. 3

eine Schnittansicht durch das Werkstück nach Fig. 2.

The invention will be explained in more detail with reference to a drawing. Hereby show:

Fig. 1

a schematic representation of an apparatus for producing inventive workpieces with a decorative layer with surface relief;

Fig. 2

a plan view of a workpiece; and

Fig. 3

a sectional view through the workpiece after Fig. 2 ,

In Fig. 1 1 schematically shows a device 100 for producing a workpiece 1 with a decorative layer 2 which has a surface 4 structured with a relief 3 having. The device 100 comprises a control device 110 and a digital printing device 130. The control device 110 comprises a processor device 112 and a memory device 113. The memory device 113 stores a program code 114 which can be executed on the processor device 112 and effects a functional control of the device 100 , The control device 110 further comprises an interface 115, via which the printing device receives digital decor data 116, which describe both the graphic design of the decorative layer 2 and the relief structure 3 for the workpiece 1. A copy 116 'of the decor data is buffered in the storage device 113.

The control device 110 is embodied such that the decorative data 116 is evaluated by means of the program code 114 and the digital printing device 130 is activated such that the decorative layer 2 is formed on a carrier 5.

The carrier can be, for example, an organic material, for example an MDF or HDF board, a composite material such as WPC (wood-plastic composite) or else cement fiber or gypsum fiber boards. The abbreviations MDF and HDF stand for medium density (wood) fibreboard and high density (wood) fibreboard. Also, the use of a film or a prepreg is possible. As a rule, only higher-priced workpieces with a surface relief adapted to a graphic decor design are formed, so that preferably MDF, HDF or WPC boards are used. These have a smooth support surface 6, which is prepared for printing, for example coated with a primer.

The digital printing device 130 in the illustrated embodiment includes a plurality of printheads 141-145, each coupled to a reservoir 151-155, each containing a corresponding ink 161-165. The printing inks are designed differently in terms of their properties. Some of the inks include pigments so that the inks, when imprinted on the support surface 6 of the support 5, produce a perceptible color impression in a human observer. In order to be able to print a full-color graphic décor, for example, at least three different printing inks are necessary, which, for example, produce a cyan, a yellow and a magenta color impression when they are printed on the support surface 6 of the carrier 5. Is the gamut, ie color space needed to one limited to printing certain graphic decor, so less or other inks can be used. The number of inks added with pigments can vary and may well be greater than three in order to be able to print the best possible visually perceptible graphic decor pattern adapted to a desired graphic decor. One or more inks may also include effect pigments. With these z. For example, images of wood pores or other structures may be better highlighted. In addition, preferably one or more of the printing inks 161-165 are formed so that they are transparent in the printed state. These inks may consist of the binders of printing inks or varnishes.

In the illustrated embodiment, the printheads 141-145 and the corresponding reservoirs 151-155 are combined to form a printhead assembly 140 which is driven by a first drive means 135 along a cross member 136 movable. The cross member defines a first direction 137, which is referred to as an X direction, for example. The cross member 136 is mounted on supports 138 which are movable by means of a second drive means 139 along a second direction 134 which is oriented transversely, preferably perpendicular, to the first direction 137, the X direction. The second direction 134 is also referred to as the Y direction. The arrangement of the supports 138, the cross member 136 and the first and second drive means 135 and 139 is selected so that the print heads 141-145 are respectively positioned controlled at each position of the support surface 6 of the carrier 5.

Via control outputs 117, the first drive device 135, the second drive device 139 and the printheads 141-145 are connected to the control device 110, so that this positioning of the printheads 141-145 above the surface 6 of the carrier 5 and a discharge of the printing inks 161-165 the reservoirs 151-155 on the printheads 141-145 can effect and controlled.

This will, as in Fig. 3 illustrated, both a graphic decorative layer 31 created, which is preferably formed over the entire surface and is formed by means of different printing inks 161-165 to emboss a graphically perceptible image of the decor. In addition, further decorative layers 32-35 are preferably arranged, which are formed from different printed layers. These further printing layers or Decorative layers are laterally structured, which does not generally form the entire surface over the entire surface 6 of the carrier 5 and / or not formed with the same layer thickness. This results in the surface relief structure of the decorative layer 2.

In all embodiments, the outermost or topmost decorative layer 36 is formed integrally, but without it leveling the relief structure formed by the different number of printing layers 31-35 formed therebelow. The uppermost decorative layer can also be created by means of one of the printing inks 161-165. In other embodiments, after leaving the digital printing device 130, the workpiece is provided at one further processing station (not shown) with one or more top coats, but all of which are applied such that the differently frequent and / or uneven printing An advantage of the device is that the printing layers forming the relief structure are applied to the carrier 5 with the same digital printing device in order to form the workpiece 1 with the decorative layer 2. It can thereby be achieved that the relief structures are in register However, the at least one outer or uppermost decorative layer, which is formed over the entire surface, e Ine closed and well protected against abrasion and other burdens layer created that significantly increases the durability of the created workpieces 1 compared to the known from the prior art workpieces. Also, a tendency to "pick up" or "hold" soiling and other buildup is significantly reduced. This results in easier-to-clean workpieces, which in particular are easier to clean.

In Fig. 2 is a schematic representation of a workpiece 1 shown in plan view. The view is directed to the surface 4 of the workpiece 1 provided with the decorative layer 2. Evident is a graphically printed decorative pattern, which has schematically indicated and differently colored regions or regions of pressure 11-13, which have a different hatch density and / or hatching to indicate this Tatsche. At the transitions between the longitudinally extending differently colored printing areas 11, 12, 13 there is in each case a relief structure formed on the surface and facing the observer. In addition, a circular Holzpore16 is shown, with A depression in the surface is associated. To support the optical three-dimensional effect of the wooden pore 16 and / or to highlight it, it is also possible to use a printing ink with effect pigments.

In Fig. 3 is a sectional view taken along the line AA Fig. 2 shown. Good to see that on the surface 6 of the carrier 5, the decorative layer 31 is applied, which is formed substantially over the entire surface and has a nearly uniform layer thickness. Even if the individual pressure areas appear here as large-area areas, it is understood by the person skilled in the art that the visually perceptible graphic impression is formed by a multiplicity of applied ink droplets of different printing inks, which each produce a different color impression, so that according to the laws of optics a color subtraction is respectively locally a corresponding desired color impression in a human observer caused. For reasons of simplification, it is assumed that the graphic print image is essentially formed by three printing areas 11, 12, 13 each producing a uniform color impression. At the boundaries between the large-scale pressure areas 11-13 color-contrasting further pressure areas 14, 15 are formed. These correspond to raised structures 74, 75. In the printing area 12, a wooden pore 16 is also graphically reproduced. This corresponds to a recess 77th

Above the decorative layer 31, which is formed by means of a graphic printing layer 21 and forms the graphically perceptible décor, further printed layers 22-26 are applied, which are of transparent design. A second decorative layer 32 directly adjoining the decorative layer 31 is designed to be transparent and completely covers the graphic decorative layer 31 in the illustrated example. The printing layers 23-24, which are likewise arranged in a transparent manner, are laterally structured in order to form the recess 77 for the wood pore 16, which has different diameters 81, 82, depending on a distance from the surface 6 of the carrier 5. The print layer 25 is patterned to form the raised structures 74, 75 corresponding to the print areas 14, 15. A last decorative layer 26 is again formed over the entire surface, conforming to the relief, which is formed by the laterally structured printed layers 23-24, so that a structured surface is produced. In the area of the wooden pore 16, a surface 50 exists, with the first surface portions 51, which coincide with the depression, a smaller one Decorative layer thickness than the remaining surface portions 52 of the first surface 50 have. As a result, a positive structure of a wooden pore is formed. Likewise, in the region of the elevation there is a second surface 60, in which further first surface portions 61 in the region of the elevation have a higher decorative layer thickness than the other further surface portions 62, so that an elevation 74 is thereby formed.

In all embodiments, the outermost decorative layer is or is formed as a full-surface lacquer layer. Especially corundum paints are used to achieve a high durability. These are preferably not applied by means of a digital printhead, since the corundum coatings quickly wear such printheads. Since a uniform areal non-planarizing job is desired, use of a digital printhead, though possible, is generally undesirable. For example, the ink forming the uppermost decorative layer is sprayed or applied in a similar manner. By a suitable choice of the viscosity of this lacquer layer form printing ink, which is referred to here as printing ink regardless of the application, and suitably selected measures for curing and / or drying the lacquer layer, a leveling of the previously formed relief structures can be avoided. For example, a time between application and heating of the lacquer layer and / or irradiation of the lacquer layer can each be selected short for the purpose of drying or curing.

It is understood that only exemplary embodiments for forming such a workpiece, an exemplary workpiece and an exemplary apparatus for forming such a workpiece are described here. In particular, a device can have a plurality of print head arrangements formed separately from one another, which are driven separately and can be positioned relative to a carrier to be printed.

LIST OF REFERENCE NUMBERS

1

workpiece

2

decorative layer

3

Relief (structure)

4

(Decorative) surface

5

carrier

6

support surface

11-15

Areas of the graphically perceptible decor pattern

21

graphic print layer (forms the graphically perceivable decor pattern)

22-26

printed layers

31

graphic decorative layer (forms the graphically perceptible decorative pattern)

32-36

decorative layers

50

area

51

first area fraction

52

remaining area shares

60

additional area

61

further first area shares

62

other remaining area shares

74, 75

sublime structures

77

deepening

81, 82

diameter

100

contraption

110

control device

112

Processor device (CPU)

113

memory device

114

program code

115

interface

116

Decor data

116 '

Copy of decor data

117

control outputs

134

second direction (Y direction)

135

(first) drive device

136

crossbeam

137

first direction (X direction)

138

Support

139

second drive device

140

Printhead assembly

141-145

printheads

151-155

reservoirs

161-165

printing inks

Claims (15)

Workpiece (1) with a surface-structured decorative surface, comprising a support, on which a graphic decor is printed in at least one printed layer, which is at least partially covered by at least one lacquer layer, characterized in that a structuring of the decorative surface formed by a multiple or irregularly executed digital printing is and a topmost decorative layer is formed as a paint view over the entire surface. Workpiece (1) according to claim 1, characterized in that a plurality of laterally structured printed layers are formed by the multiple digital printing performed. Workpiece (1) according to claim 1 or 2, characterized in that the lacquer view over the entire surface formed topmost decorative layer locally each having an approximately equal layer thickness. Workpiece (1) according to one of the preceding claims, characterized in that the uppermost decorative layer is designed as a glossy lacquer layer. Workpiece (1) according to one of the preceding claims, characterized in that the pressure layers applied in the multiply executed digital printing each comprise color pigments. Workpiece (1) according to one of the preceding claims, characterized in that at least one pressure layer applied by means of the multiply executed digital printing is made transparent in addition to the decorative layer formed as a lacquer layer. Workpiece (1) according to one of the preceding claims, characterized in that at least one decorative layer which forms a lacquer layer is printed as a printing layer. Workpiece (1) according to one of the preceding claims, characterized in that the relief structures resulting from the multiply executed digital printing are formed in the register with graphically detectable decorative patterns. Workpiece (1) according to one of the preceding claims, characterized in that the decorative surface comprises positive relief structures in which in a contiguous area area recessed surface portions exist that have a decorative layer thickness below a mean decorative layer thickness in the surface area, and increased surface portions exist that a decorative layer thickness above a mean decorative layer thickness in the surface area, wherein the recessed surface portions cover a smaller area proportion of the area area than the increased area proportions and the recessed area proportions form the positive relief structure. Workpiece (1) according to one of the preceding claims, characterized in that the decorative surface comprises negative relief structures in which further recessed surface portions exist in a contiguous further surface area having a decorative layer thickness below a mean decorative layer thickness in the wider surface area, and further increased area shares exist which have a decorative layer thickness above an average decorative layer thickness in the further surface area, the further recessed surface portions covering a higher area portion of the further area area than the further increased area portions and the further increased area portions forming the negative relief structure. Apparatus (100) for forming a workpiece (1) having a surface-structured decorative surface, comprising a control device (110) and a digital printing device (130) coupled thereto,
Providing a carrier (5);
wherein the control means (100) is adapted to detect decor data (116) comprising a graphic decor pattern and relief information;
and to control the digital printing device (130) in accordance with the decor data (116), that the carrier (5) is printed by the digital printing device (130) at least with a laterally structured printing layer to provide a surface relief of the To effect formed decorative layer of the workpiece and form a topmost decorative layer as a paint view over the entire surface. Apparatus according to claim 11, characterized in that the digital printing device (130) is an ink jet printing device. Apparatus according to claim 11 or 12, characterized in that the inkjet printing device (130) comprises a plurality of print heads (141-145), each of which can be selectively arranged as often as desired over a position of the carrier (5) to locally multiple print layers (21-26 ) to print on each other, which provide for a formation of the surface relief of the decorative layer (2). Apparatus (100) according to any one of claims 11 to 13, characterized in that the digital printing device (130) comprises a plurality of printheads (141-145) each coupled to a reservoir (151-155), the number of printheads (141-145) and associated reservoirs (151-155) is so large that in addition to the reservoirs (151-155) needed to hold pigmented inks, the graphic decor pattern can be imprinted onto the substrate utilizing color subtraction or color addition is at least one of the printheads (141-145) is provided, whose associated reservoir is provided for receiving a transparent printing ink and is designed for a printing of the transparent printing ink. Method for producing a workpiece (1) with a surface-structured decorative surface, comprising the steps: Providing a carrier; Detecting decor data comprising a graphic decor pattern and relief information; Printing the support for forming the graphic decor pattern with at least one print layer and at least partial application of at least one paint layer on the support printed with the graphic decor pattern, wherein the graphic decor pattern is executed by digital printing and the support is digitally printed one or more times by digital printing to form the graphic decor pattern and the relief pattern on the support such that the one or more print layers are at different positions have different overall thicknesses, of which at least one is laterally structured, so that a total thickness of the printed layers printed varies to set the surface texture of the decorative surface and wherein a top decorative layer is formed over the entire surface as a paint view.

Images