DE102022213489B3 - Creating a decorative surface - Google Patents

Abstract

A method for producing a decorative surface on a workpiece (1) is disclosed with the following steps:- Step (S1): Providing a workpiece (1) with a workpiece surface (1a) on which there is a base decoration (2);- Step (S2): Detecting the base decor (2) on the workpiece surface (1a) with a detection device (20); - Step (S3): Measuring the detected base decor (2); - Step (S4): Providing a target additional decor template (200) for an additional decor (3), wherein the target additional decor template (200) is designed synchronously with a target base decor (150); - Step (S5): Adjusting the target additional decor template (200) based on the measured base decor, so that an adapted target additional decor template (200 ') is present , after which the additional decor can be applied at least partially synchronously with the base decor; - Step (S6): Applying the additional decor (3) to the workpiece (1) above the base decor (2) according to the adapted target additional decor template (200 ') with an application device ( 30).In addition, a device for carrying out the method is disclosed.

Description

The present invention relates to a method for producing a decorative surface on a workpiece and a device for carrying out the method.

In particular, the present invention relates to a method and a device for producing an optically and/or haptically structured surface on a workpiece. The workpiece provided with the decorative surface can be used to create a desired design. For example, the workpiece can be used as a floor panel, a furniture panel, or a panel for tables, cabinets, wall and/or ceiling paneling. Another possible application is a panel for the external cladding of facades, e.g. building exterior walls. It is typical that different decors have to be placed on top of each other on the workpiece in a precise manner, i.e. synchronously. The decors can be both two- and three-dimensional decors.

In particular, the invention deals with the problem of applying a second decoration (additional decoration) to a workpiece synchronously with a first decoration (basic decoration).

A typical application here is the creation of a synchronous structure with elevations and/or depressions in the range of usually less than a millimeter in height on a surface that has already been provided with a two-dimensional decor, such that the elevations and depressions are synchronous with the underlying decorative layer (base decor ) lay. An example of such a design is a panel printed with a wooden surface, in which a corresponding depression is created in the area of printed (replicated) knotholes. Another example is a tiled surface where the joints between the tiles are made slightly recessed using this process, while the individual tiles themselves are raised in comparison.

Processes are already known that involve the production of workpieces with decorative surfaces. Particularly worth mentioning here is the publication EP 3 109 056 A1 . A method is disclosed here which involves the creation of three-dimensional structures in combination with the creation of a decorative image. This means that a base decor and an additional decor are applied to a workpiece to form a decorative surface. The decorative image can be the basic decor, with the three-dimensional structure then functioning as an additional decor and placed above the basic decor on the workpiece. However, the opposite case is also conceivable, in which the three-dimensional structure functions as the base decor and the decorative image was placed above the structure as an additional decor.

What is problematic here is the application of the additional decor without taking the actual geometry of the base decor into account if synchronicity between the two decors has to be achieved. A typical application here is the production of a decorative surface that mimics a wooden surface that has a wood grain and knotholes as decorative elements. The structure of this decorative layer is usually such that a base decor, in this case a two-dimensional image of the wood surface, is present on the workpiece surface and an additional decor is applied above this base decor, which here represents the three-dimensional wood structure. It is desirable here that the additional decoration is applied in such a way that synchrony with the base decoration is ensured, even if the base decoration is distorted, twisted or displaced on the workpiece surface.

Synchronicity here is to be understood as minimizing any mismatch between the basic decor and additional decor. Both the basic decor and the additional decor are designed as related decors. This means that they are coordinated with one another in such a way that when they are placed one on top of the other on the workpiece, they create a harmonious decoration. A mismatch means that parts of the base decor and additional decor are not placed on top of each other as desired, resulting in a visual flaw in the decor created from the base decor and additional decor.

Since errors or inaccuracies can occur when applying the base decoration to the workpiece, a fitting error can occur if the additional decoration were to be applied without taking the errors into account. Defects in the base decoration can occur, for example, due to a stretching of a film, such as a PVC film, which has the base decoration, while the film is laminated onto the workpiece. If the base decoration is applied using a printing process (analog or digital), errors in the printing process or incorrect alignment of the workpiece can also introduce errors into the base decoration.

In general, such fit errors can always occur when there are measurable deviations between a target base decor (as it was designed analogously or digitally) and the actual actual base decor, as is measurably present on the workpiece after the base decor (i.e. the actual base decor) has been applied. For example, if a tile design as the base decor has a print length of 1,430 mm and a printed length of 1,433 mm is measured after the printing process on the carrier material (roll goods, sheets or similar), there is a corresponding printing error. If an additional decoration with a length of 1,430 mm is now applied to the base decoration, there will only be no registration error in the unrealistic case that exactly the same error occurs in the second printing process as in the first printing process. In all other (much more likely) cases there is a corresponding passport error. For example, if the base decor is laminated and the additional decor is applied using digital printing, two different processes are used, which increases the likelihood of a misfit.

The state of the art also includes: EP 3 615 341 B1 and the DE 10 2010 036 454 A1 to call. Both show possibilities for producing a textured coating on a base decor.

It is the object of the present invention to show a possibility that a synchronous application of the additional decoration to the basic decoration can be ensured, in particular even if when the basic decoration is applied there is already a deviation between the target basic decoration and the actually printed basic decoration, for example in length, width, elongation or Compression has resulted.

This task is solved by the subject matter of the independent claims. Advantageous further training is the subject of the subclaims.

• - Schritt S1: Bereitstellen eines Werkstücks mit einer Werkstückoberfläche auf der sich ein Basisdekor befindet;
• - Schritt S2: Erfassen des Basisdekors auf der Werkstückoberfläche mit einer Erfassungseinrichtung;
• - Schritt S3: Vermessen des erfassten Basisdekors;
• - Schritt S4: Bereitstellen einer Sollzusatzdekorvorlage für ein Zusatzdekor, wobei die Sollzusatzdekorvorlage synchron zu einem Sollbasisdekor ausgebildet ist;
• - Schritt S5: Anpassen der Sollzusatzdekorvorlage auf Basis des vermessenen Basisdekors, so dass eine angepasste Sollzusatzdekorvorlage vorliegt, nach der das Zusatzdekor zumindest teilweise synchron zum Basisdekor aufgebracht werden kann;
• - Schritt S6: Aufbringen des Zusatzdekors auf das Werkstück oberhalb des Basisdekors gemäß der angepassten Sollzusatzdekorvorlage mit einer Aufbringungsvorrichtung.

According to the invention, a method for producing a decorative surface on a workpiece is provided. The procedure has the following steps:

• - Step S1: Providing a workpiece with a workpiece surface on which there is a base decoration;
• - Step S2: Detecting the base decoration on the workpiece surface with a detection device;
• - Step S3: Measuring the recorded base decor;
• - Step S4: Providing a target additional decor template for an additional decor, the target additional decor template being formed synchronously with a target base decor;
• - Step S5: Adjusting the target additional decor template based on the measured base decor, so that an adapted target additional decor template is present, according to which the additional decor can be applied at least partially synchronously with the base decor;
• - Step S6: Applying the additional decoration to the workpiece above the base decoration according to the adapted target additional decoration template with an application device.

Preferably, at least one of steps S3, S4 and S5 is carried out by a data processing device. In this way, the process can be carried out automatically.

The method according to the invention is intended in particular to be carried out by a device that processes the workpiece continuously. This means that several workpieces can be processed one after the other in an industrial manner.

Essentially, the base decor that is already on the workpiece is analyzed by detecting and measuring in such a way that the additional decor can then be applied synchronously or with minimized fitting errors to the base decor using the target additional decor template adapted according to step S5. The result is an adaptation of the additional decor to the actual base decor (actual base decor). If the actual base decor is applied to the workpiece surface without errors, it corresponds to the target base decor.

The process described here can significantly reduce waste in production and improve the quality of production. For example, if there is a base decor on the workpiece surface, for which an exact alignment, proportion and/or position relative to the workpiece is not absolutely necessary, since for a viewer to recognize the base decor it simply does not matter where on the workpiece surface the base decor elements are of the basic decor, the application of the additional decor in accordance with the adjusted target additional decor template ensures that there is still synchronicity between the two decors (basic decor and additional decor) and that the workpiece is not sorted out as rejected goods despite the defects or errors in the actual basic decor. An example here is the imitation of a natural product, such as a wooden surface. Here, for example, a two-dimensional image of the wood decor or the wood surface is used as the base decor. This means that it is a representation of an irregular and natural decor, the decorative elements of which have different characteristics and can be designed in particular as knotholes, grooves, notches but also flat sections and color changes. Himself If such a base decoration is not applied to the workpiece surface as desired in accordance with a specific orientation, proportion and/or position, this is nevertheless irrelevant for a viewer, at least to a certain extent, which is defined by aesthetic evaluation standards, as the viewer will always recognize a wood decor because there are corresponding decorative elements that determine the overall impression of the wood decor. The actual orientation, proportion and/or position does not detract from the overall impression of a wood decor. In fact, one can possibly even assume that a viewer will not expect to see constantly repeating patterns in such a wood decor, which experience has also shown to be the case with real wood. If a corresponding additional decor is applied to this basic decor, which is a three-dimensional structure that actually replicates the decorative elements, the result is that the feel of the workpiece surface is changed from a flat surface to an actual, three-dimensional wooden structure. A decorative element of the basic decor (e.g. an image of a knothole) coincides with the corresponding decorative element of the additional decor (e.g. a three-dimensional knothole structure). This means that both decorative elements are now arranged synchronously with one another, since the target additional decorative template has been adapted to the basic decor on the workpiece.

Below, “proportion” can be understood to mean a description of an expansion and/or compression and/or twisting of the corresponding decoration, in particular in the x-direction and/or in the y-direction (i.e. transverse to the feed direction and/or in the feed direction). This can extend over the entire decor or just over a section of the corresponding decor.

An “alignment” concerns the corresponding decor as a whole and describes its orientation. That is, whether the decor is oriented in the desired direction or is twisted as a whole. If there are deviations between the target and actual alignment, then there is a deviation in the alignment.

Finally, the “position” describes the place where the corresponding decor is positioned. If there are deviations between the target and actual position, there is a deviation in the position.

In addition to wood decors, other decors are also conceivable here, which can be represented by a combination of basic decor and additional decor. In particular, tile decors, other natural decors such as stone floors and the like should be mentioned here.

The method is preferably carried out in such a way that the adapted target additional template is created directly for the application of the additional decoration by the application device. This means that if the method is carried out in a device that also provides the workpiece with the additional decoration after detecting and measuring the base decoration (for example when processing the workpiece in a continuous process), it is sufficient to provide the target additional decoration template or keep it in a memory. This is then individually adapted to the base decor actually present on the workpiece. For this purpose, it is preferably provided that the then adapted target additional decorative template is not stored permanently, but is only provided to the application device as a data record. For this purpose, a volatile data memory of the application device, such as the main memory, can be used. Of course, it is alternatively or additionally conceivable to permanently save the adjusted target additional decor template, for example in order to document production.

A synchronous application of base decoration and additional decoration preferably leads to a deviation of individual decorative elements that is less than +/- 3 millimeters, preferably less than +/- 1 millimeter, particularly preferably less than +/- 0.5 millimeters.

Essential to adapting the target additional decor template is the detection of the basic decor (actual basic decor) in step S2 on the workpiece surface. A detection means is preferably used for detection.

The detection is preferably carried out without contact, in particular optically.

One possibility for optical capture is to capture the base decoration with a camera that is part of the capture means. This means that the workpiece surface on which the base decoration is located is captured, for example, with a camera and the captured information is converted into an image file. A camera can be used that captures the basic decor as a whole or just a section of it. Furthermore, it is also conceivable that the base decoration is detected in the invisible light range.

Both a two-dimensional base decor and a three-dimensional base decor can be captured with a camera. While with a two-dimensional base decor it is conceivable that the color or the decorative elements formed from it, of the base decor, is recorded, when a three-dimensional base decor is captured, in addition to being captured by camera, it is also possible to detect reflections or shadows of the decor detect which were generated by a light source of the detection means and which is directed at the base decoration and emits light in the direction thereof. The image of reflections and/or shadows of the base decoration recorded by the camera can then be stored digitally as information about the base decoration. For this purpose, in particular, a light source can emit light or electromagnetic radiation at an angle of less than 90 degrees, preferably less than 60 degrees, to the surface of the workpiece, and the detection means can also be aligned at such an angle to the surface of the workpiece. In the case of a three-dimensional base decor, reflections and/or shadows can be used, in particular, to determine individual flanks of the three-dimensional structure or to determine the height. If the base decoration is detected with a camera of the detection means, a light source of the detection means can also be used, which emits invisible light (UV light or IR light), which then causes special reflections of the base decoration, which are detected by the camera can. Another possibility of generating reflections and/or shadows of the base decoration and recording them as information about the base decoration is through the use of a laser by the detection means, which is directed at the base decoration as a light source.

When detecting the base decoration without contact, in particular when detecting it optically, it is also conceivable to detect the base decoration with several detection means. These can capture the base decor from the same angle and/or from different angles. This makes sense, particularly in the case of a base decor that has a different appearance depending on the viewing angle, in order to collect a sufficient information or data basis for measuring the base decor according to step S3. Especially with a three-dimensional base decor that has elevations and/or depressions, it makes sense to capture the base decor from different angles.

Alternatively or additionally, there is the possibility of capacitively or inductively detecting the base decoration by using a detection means that has corresponding sensors. If the base decor is designed in such a way that it allows electric or magnetic fields to be changed in sections in such a sensor, the base decor can also be detected via these sensors.

In addition, other options or ways of recording the basic decor are alternatively or additionally possible. For example, the detection can also be carried out with a detection means that has a touch sensor, which, for example, detects a height profile of a three-dimensional base decoration or which can detect certain components of the base decoration by touch, for example electrically conductive or magnetic decorative elements.

In addition to the base decor or individual base decor elements, specially designed elements of the base decor can also be recorded, such as brands or edges of the base decor.

The result is particularly preferably the positions of the base decorative elements and/or the marks and/or the edges of the base decorative.

Preferably, the orientation and/or position of the workpiece itself, which has the base decoration, is determined or specified before recording or measuring. The capture can be done in the same way as the capture of the base decor. A specification of the orientation and position of the workpiece can be done mechanically, for example by guide devices that align the workpiece accordingly while it is being transported in a feed direction. An alignment of a fixing device that fixes the workpiece is also conceivable.

Preferably, detecting the base decoration in step S2 includes detecting marks of the base decoration. Alternatively or additionally, detecting the base decoration in step S2 includes detecting at least one edge of the base decoration. Alternatively or additionally, detecting the base decor in step S2 includes detecting at least one decorative element of the base decor. In particular, the detection of the base decoration in step S2 can consist exclusively of a detection of marks, at least one edge of the base decoration and/or at least one decorative element of the base decoration.

The marks or the edge are or were applied to the workpiece surface using the same process as the base decoration itself. This ensures that information about the alignment, proportion and/or position of the base decoration can be derived from the detection of the corresponding marks or the edge, because errors in the marks and/or the edge of the base decoration also allow conclusions to be drawn to errors in the entire basic decor.

Preferably, several of the brands and/or decorative elements are recorded and measured. Preferably at least two, particularly preferably four, in particular 16 brands and/or decorative elements are recorded and measured. If min If at least three marks and/or decorative elements are recorded and measured, it is advantageous if these do not lie on a straight line, so that the extent of the base decoration on the workpiece surface can be measured in two dimensions.

Marks can in particular be provided as invisible markings on the workpiece or on the base decoration. This means that they are not visible to the human eye and therefore do not disturb the overall aesthetic impression of the workpiece after it is finished. These can be marks that can be detected capacitively or inductively, or marks that emit or reflect light in the invisible wavelength range. A corresponding detection means can then detect these marks.

Preferably, in step S3, i.e. when measuring the base decoration, information about the orientation, proportion and/or position of the base decoration on the workpiece surface is determined. In this way, an actual basic decor property is determined, which then acts as the basis for adapting the additional decor template.

If a corresponding error was introduced into the base decoration when applying the base decoration, for example an elongation of the base decoration (this corresponds to a change in proportion), this can be recognized because the distance between two corresponding marks is now compared to a reference value or target value, as it is for example, specified by the target base decor, is enlarged. This means that the actually measured actual base decor on the workpiece surface no longer corresponds to the target base decor in all dimensions. When applying the base decoration, in addition to elongation, compression or elongation can occur in the x direction (transverse to the feed direction of the workpiece) as well as in the y direction (in the feed direction), as well as combinations of these errors. Actual basic decor properties such as alignment, proportion and/or position can therefore be determined by looking at individual elements such as marks, an edge or even individual decorative elements of the basic decor. To determine deviations, brands, an edge or even individual decorative elements of the base decor can then also be compared with a target base decor in order to determine deviations, as will be explained further below.

Marks can be positioned inside or outside the area that the base decoration occupies on the workpiece surface. If they are positioned within the base decor, they can act as a permanent part of the base decor, so that they later aesthetically fit into the base decor and function as base decor elements. However, they can also be removed in a later step.

The marks are preferably positioned in such a way that their detection contains or enables information about the orientation, proportion and/or position of the base decoration. For example, two marks can be used to determine whether the distance between these marks corresponds to an expected distance, which is given, for example, by a target base decor, or whether there is a compression (distance too small) or a stretch (distance too large) of the base decor in the Direction of extension exists between these marks.

If there are three marks that are not placed on a common straight line, for example a compression or stretching between each pair of marks can be determined. If there are four marks that together form the corner points of a square, preferably a rectangle or square, a two-dimensional base decor can be recorded relatively precisely in its length and width. However, it is also possible to use the recording of the marks to record a three-dimensional base decoration in its length and width. For example, a mark can be provided at a specific position that corresponds to a specific three-dimensional decorative element. Thus, by detecting this mark alone, it can be determined at which position the corresponding decorative element is positioned.

Several brands can also be individualized so that they can be distinguished from each other when measuring the basic decor recorded. For example, brands can be visually designed differently by having different shapes and/or colors. They can also be designed to be readable by the detection device or a data processing device used to carry out step S3, for example by having a barcode, a QR code and/or a label. It is also conceivable to make brands readable electronically, for example by allowing brands to send out information, as is possible with RFID chips. By designing the marks so that they are readable by the recording device or the data processing device or have readable information, it is possible to identify the marks during the measurement. It is also possible to provide brands with additional readable information. For example, a target base decor can be retrieved from a stock of target base decors using the readable information and assigned to the base decor actually present on the workpiece surface.

If the base decoration is provided with an edge, the edge or at least one edge of the base decoration can also be used to capture the base decoration and in particular to determine information about the orientation, proportion and / or position of the base decoration. The edge of the base decoration can be provided as a line that is visible or invisible to the human eye and can only be detected by the detection means. However, it can also be an edge in a three-dimensional base decor. It is also possible for the edge to be removed again in a later processing step, ie after capture. The 1a and 1b also show how various properties of the base decor can be determined by detecting the edge of a base decor. Please refer to the corresponding description below.

Finally, capturing decorative elements of the base decor itself corresponds to capturing brands. A decorative element here functions as a brand and can be used in particular in combination with other decorative elements or brands to determine the properties such as alignment, proportion and/or position of the base decor, as described above.

Advantageously, the basic decor is recorded, measured and at least one basic decorative property is determined from this. Thus, with the at least one base decor property, there is, for example, information about the orientation, proportion and/or position of the base decor on the surface of the workpiece. This is essential for the further implementation of the method, because the information about the basic decor now provides the basis for adapting a target additional decor template with regard to at least one additional decor property, such as alignment, proportion and / or position of the additional decor. This means that the target additional decor template is now adapted to the base decor (actual base decor) actually present on the workpiece surface in order to achieve a synchronous alignment of the base decor and additional decor. If, for example, the measurement shows that the base decoration is applied to the workpiece surface in a twisted manner, i.e. not in the correct orientation, the target additional decoration template is also adjusted accordingly, so that the additional decoration is applied in a correspondingly rotated manner, so that synchronicity between the two decorations is again established. If the measurement shows, for example, that the base decor is distorted, i.e. not in the correct proportion, applied to the workpiece surface, the corresponding target additional decor template is also adjusted so that the additional decor is applied in a correspondingly distorted manner, so that synchronicity between the two decors is again established . For example, if the measurement shows that the base decor is incorrectly positioned, i.e. is not applied to the workpiece surface in the correct position, the corresponding target additional decor template is also adjusted so that the additional decor is applied at the position of the base decor, so that synchronicity between both decors is again achieved is manufactured. It is understood that the base decor may also have errors in at least two of the properties alignment, proportion and position or in all three properties. The target additional decor template is then adjusted accordingly so that synchronicity between the two decors is restored.

Advantageously, information about the height of the base decoration or its height profile is also determined when measuring the base decoration. This is particularly advantageous for basic decors that have a three-dimensional structure. In this way, the base decoration actually present on the workpiece surface can be described not only in terms of its length and width and thus in particular in terms of alignment, proportion and position, but also in its height profile. This is particularly relevant if the height profile of a base decor to be printed is changed in such a way that the area on which the additional decor is to be applied is changed in extent compared to the expected area of a target base decor, that is, enlarged or reduced. For example, a basic decorative element is mentioned here that tapers upwards, i.e. away from the workpiece surface. This can be a cone or a pyramid or a truncated cone or a truncated pyramid. If an additional decoration is to be applied to such a base decorative element, it can be provided that material for the additional decoration is also applied to the side surfaces of the base decorative element, for example on the lateral surface of the cone or truncated cone or on the side surfaces of the pyramid or truncated pyramid. If the corresponding base decorative element is designed to be higher or lower than the target base decor, the side surface or the lateral surface is correspondingly larger or smaller. In any case, the amount of material required for the additional decor differs from that which would actually have to be used based on the unadapted target additional decor template. Based on the recorded height profile, information about the actual height of the base decorative element is available. Based on the actual height of the base decorative element, the actual size of the surface of the base decorative element and thus also the actual amount of material required for the additional decoration can be determined can be at least approximately determined using mathematical models. The required amount of material determined in this way can then be transferred to the adjusted target additional decor template when adapting the target additional decor template, after which the additional decor is then applied. In this way, irregularities in the height profile of the base decor can be addressed. Otherwise, there would be a risk that if the base decorative element is too high, for example, complete coverage of the base decorative element by the additional decor would not be possible, or that if the base decorative element is too low, too much material would be applied to the base decorative element, which would result in the contour of the base decorative element being changed would, as the material for the additional decor would more equalize the contour of the base decor element.

According to an advantageous embodiment of the invention, it is provided that the target additional decor template has adjustment elements whose position corresponds to corresponding synchronization elements of the base decor on the workpiece or which must maintain a certain distance from the corresponding elements of the base decor in order to apply the additional decor synchronously with the base decor. The synchronization elements are preferably detected when the base decoration is detected and then measured so that their position is known. The adjustment of the additional decorative template to the actual base decor is then carried out in such a way that the adaptation elements of the additional decorative template are moved so that the required distances from the synchronization elements are achieved. It is preferably provided that a synchronization element corresponds to a mark, an edge and/or a base decorative element.

Preferably, the base decoration is recorded on a pixel-based basis in step S2 and/or measured on a pixel-based basis in step S3. This is particularly advantageous if the additional decoration is applied pixel-based, for example with a digital printing medium, such as a digital print head or a digital print bar. Deviations of the base decor from a target state, in particular from a target base decor, can thus be described with pixel precision. It is particularly advantageous if the pixel-based detection and/or measurement of the base decoration is carried out with the same resolution as that of the target additional decoration template. In this way, a deviation of the base decor from the target state can be directly translated into corresponding pixel deviations. These pixel deviations, which can be present as shift vectors, then represent a deviation of individual pixels of the base decor from the target state. The same shift vectors can then be used in step S5 to shift and thus adapt the pixels of the target additional decor template. If the resolution with which the base decor is recorded in step S2 and/or measured in step S3 deviates from the resolution of the target additional decor template, an adjustment can be carried out. This can be carried out in such a way that the pixel resolution after step S2 or in or after step S3 is adapted to the resolution of the target additional decorative template. Alternatively, the determined displacement vectors can also be adjusted.

Instead of detecting each pixel of the base decoration separately in step S2 and/or measuring it in step S3, it can also be provided that the displacement vectors are determined from the options described above. This means that if information about individual brands, decorative elements and/or about an edge of the base decor is recorded, conclusions can also be drawn about, among other things, an orientation, proportion and/or position of further decorative elements of the base decor or the base decor as a whole. This can be at least approximately calculated, for example, using mathematical models. If, for example, two marks or decorative elements are detected whose distance has been increased by a certain proportion, then, for example, assuming that the change in distance has occurred uniformly, a uniform one can be achieved for pixels or decorative elements that lie on the straight line connecting these two marks or decorative elements and a continuously increasing displacement along the straight line can be assumed. This means that if the distance between both marks or decorative elements is increased by 20%, a pixel or decorative element that should be located on 25% of the connecting route is shifted by 5% along the connecting line. A pixel or decorative element that should be located on 50% of the connection path is moved by 10% along the connection line. A pixel or decorative element that should be located at 75% of the connection path is ultimately moved by 15% along the connection line. Of course, this is only an exemplary way of determining the shifts.

Alternatively or additionally, in order to adapt the target additional decor template, a pixel is read from the unadapted target additional decor template and moved to a new position. This means that the information (such as the amount of printing material, color, etc.) that was contained at this pixel position to carry out the application of the additional decoration is moved to a new position as part of the adjustment of the target additional decoration template. It can happen that information is exact be adopted, that is, the information is simply transferred to another pixel somewhere else. However, it can also be provided that information for a pixel of the adapted target additional decorative template is calculated from several originally existing pixels of the unadapted target additional decorative template, or that the information of a pixel of the unadapted target additional decorative template is now distributed over several pixels of the adapted target additional decorative template.

In step S3, information about the target base decor is provided and a deviation of the base decor from the target base decor is determined by comparing the detected base decor with the target base decor. This means that the measurement of the recorded basic decor leads to differences from a target basic decor being determined. This can be done in particular by comparing target positions with actual positions of brands, decorative elements and/or an edge of the base decor.

Providing the information about the target base decor can be done, for example, by providing a digital data record. This can in particular be a digital data set, based on which the base decoration was applied to the workpiece surface. For a two-dimensional base decor, this can be an image file. In the case of a three-dimensional base decor, such an image file or such a file that describes the target base decor in the plane can be enriched with further information that also describes the target base decor in the upward extension. This means it can have a height profile.

However, the information about the target base decor can also be available in a significantly reduced form. For example, this can be understood to mean the specification of target positions of one or more brands of the base decor, at least one edge of the base decor and/or of individual decorative elements of the base decor but also of the base decor as a whole. The base decor property that is now determined, i.e. in particular an orientation, proportion and/or position of the actual base decor on the workpiece surface, can now be determined by comparing the correspondingly detected marks of the base decor, the at least one edge of the base decor and/or decorative elements of the base decor on the workpiece surface. The entire base decor can also be compared with an entire target base decor.

In this case, the base decor property is not present as an absolute indication of, for example, the orientation, proportion and/or position of the actual base decor, but instead as an indication relative to a target base decor that is characterized by the at least one target base decor property.

Preferably, the information about the target base decor is provided as a digital data record.

For example, the target basic decor property can thus be read in by a control device.

For example, the data set provided in this way can only include data on the desired orientation, proportion and/or position of the brands or individual decorative elements of the base decor. However, there may also be other properties in this data set. In particular, if the base decoration has a two-dimensional decorative image, image information can be stored as an image file in the data record. With a three-dimensional design of the base decor, a height profile can be saved in addition to the extent in the plane.

Preferably, the result from the measurement according to step S3 and/or the target additional decor template is provided as a digital data record. These data sets can also be processed by a control device. The target additional decor template can be used to control a device to apply the additional decor. The target additional decor template is only changed in the information it contains by the adjustment according to step S5, but not structurally. I.e. the adjustment according to step S5 ultimately only results in the application of the additional decoration according to step S6 now being changed compared to the application according to a non-adapted target additional decoration template.

Preferably, step S5 includes adjusting at least the orientation, proportion and/or position of the target additional decorative template. In summary of the method described above, at least one additional decorative element is adapted based on the detected basic decorative property, so that there is again a synchronous alignment between this decorative element and the corresponding element of the basic decorative element.

Alternatively or additionally, step S5 may include that adjustment elements of the target additional decor template are shifted in accordance with the base decor in order to adapt the target additional decor template to the base decor. Adaptation elements can be special areas of the target additional decor template, for example decorative elements. However, it can also be provided that a specific area of the target additional decorative template is described. In particular, this can be certain pixels or be a specific pixel structure of the target additional decor template. After the target base decor and the target additional decor template have been coordinated with one another, a certain distance from corresponding elements of the base decor to the adaptation elements is also specified. Below, these elements of the base decor are referred to as synchronization elements. In particular, it can be provided that the synchronization elements must be congruent with the adaptation elements in order to establish synchronicity between the base decoration and the additional decoration. However, it can also be provided that a certain distance must be set between the synchronization element and the adaptation element. The synchronization elements of the base decor can be marks, a border and/or decorative elements of the base decor mentioned above.

After carrying out step S3, i.e. measuring the base decoration, the result can be the position of these synchronization elements on the workpiece surface. The adjustment of the target additional decor template according to step S5 can now be carried out in such a way that previously known distances between the synchronization elements and the adaptation elements are known, which must be set, through the coordination of the target base decor and the unadapted target additional decor template. These distances are preferably zero, i.e. a corresponding adaptation element should be placed synchronously with a corresponding synchronization element, i.e. congruent in this case. By shifting the adjustment elements towards the synchronization elements, a total shift of further elements of the additional decor can be derived. This is preferably done using mathematical models by determining displacement vectors for individual elements of the target additional decor template. If the target additional decor template is pixel-based, shift vectors can be determined in this way for all pixels of the target additional decor template.

By moving the adjustment elements and in particular by generating displacement vectors, the target additional decorative template is adjusted in alignment, proportion and/or position.

The base decoration preferably comprises a two-dimensional decorative image and/or a three-dimensional structure. According to a special embodiment, the base decoration consists of a two-dimensional decorative image and/or a three-dimensional structure. Alternatively or additionally, the additional decoration comprises a two-dimensional decorative image and/or a three-dimensional structure. According to a special embodiment, the additional decoration consists of a two-dimensional decorative image and/or a three-dimensional structure.

Preferably, step S6 includes applying the additional decoration using a digital application method, an analog application method or a hybrid application method. All of these application methods can be designed to apply the additional decoration as a two-dimensional decoration or as a three-dimensional structure. These application processes can be designed specifically as printing processes and/or structuring processes. A printing process involves the creation of a two-dimensional decoration, i.e. a decorative image, while a structuring process involves the creation of a three-dimensional structure.

A digital printing or structuring process is to be understood in particular as an application process in which a digital printer, i.e. an inkjet printer, is used.

An analog printing or structuring process is characterized by analog printing means, such as a roller that rolls on the workpiece surface.

A hybrid printing or structuring process is characterized by a combination of digital and analog printing or structuring processes. For example, a printing roller is used here that rolls on the workpiece surface, with a digital printer being used before and/or afterwards.

When creating a two-dimensional decor, material, preferably in different colors, such as ink, is applied to the workpiece. With a digital printing process, this usually happens drop by drop. In an analog printing process, this is done by using an analog printing medium, such as a roller, to transfer the material to the workpiece.

A three-dimensional structure can also be created in different ways.

If a positive construction of the structure is chosen, material is applied to the workpiece one above the other, with the material being applied locally with different thicknesses, so that a three-dimensional structure results. In a digital structuring process, structural material is applied to the workpiece drop by drop, with a different amount of material being applied at different positions. This creates a three-dimensional structure with elevations and depressions. This is an additive process. With an ana In order to create a positive structure, the structuring process involves applying at least two layers of material using applicator rollers or other coating processes, with the upper layer not completely covering the lower layer locally. This means that depressions can also be shown here.

If a negative structure is chosen, a three-dimensional structure can be formed by introducing depressions into a previously applied liquid or gelled base layer. In a digital structuring process, material is applied drop by drop to a previously applied and at least not yet completely hardened base layer. Different possibilities are conceivable for forming the depressions. For example, the base layer can be displaced by the impulse effect of the droplets. However, it can also be provided that the droplets merely penetrate into the base layer or come to rest on it and here influence a subsequent curing step in such a way that the base layer material does not harden completely and can then be removed while the surrounding base layer material has hardened and as three-dimensional structure remains on the workpiece. In an analogous structuring process, in order to represent a negative structure, depressions are embossed into a base layer using embossing means, such as embossing rollers or embossing plates, whereby the three-dimensional structure is formed. This means that structures can also be represented here.

Preferably, the adapted target additional decor template is used to control the application method used.

If the application process is a digital process, the target additional decorative template is contained in a digital data set that can be used to control the release of droplets. This means that the droplet release is now controlled in such a way that the additional decoration is present synchronously with the basic decoration underneath. This applies to both two-dimensional and three-dimensional additional decor. In particular, the adapted target additional decor template enables pixel-precise droplet delivery.

If the application process is an analogue process, the flexibility that the digital process offers and which is due to the relatively free placement of the droplets is not available. An analog pressure medium, such as a pressure roller, but also an embossing medium, such as an embossing roller or an embossing plate, are designed to roll on the workpiece surface, i.e. the relative speed between the surface of the pressure medium or the embossing medium on the one hand and the workpiece on the other hand is zero. Here, however, by changing the control of the pressure medium or the embossing means or also a transport device that transports the workpiece past the printing or embossing means, it can be achieved that sliding occurs between the pressure medium or embossing means on the one hand and the workpiece on the other hand. In this way, the position and proportion in the longitudinal direction, i.e. in the rolling direction of the roller or conveying direction of the workpiece, can be changed and the additional decoration can be applied in a manner adapted to the basic decoration.

A corresponding target additional decor template or a correspondingly adapted target additional decor template does not necessarily have pixel-precise information. Instead, information can be contained here that describes the control of the corresponding printing or embossing means and/or a transport device that transports the workpiece. The target additional decorative template here can contain information about the target rotational speed of the printing or embossing means and/or a target contact pressure of the printing or embossing means and/or about a target transport speed of the transport device in order to set a desired relative movement between the printing or embossing means and the workpiece surface.

Preferably, step S5 includes creating at least one control parameter that is used to control the application method used. The target additional decor template adapted in step S5 is either used directly to control the application device, in that the information contained there can be processed directly by the application device. The adapted target additional decor template therefore already contains at least one control parameter. However, it can also be provided that a further step is provided in which control parameters that are readable for the application device are created from the adapted target additional decorative template. In particular with analog application methods, this can be the case by converting the adapted target additional decorative template, for example, into the above-mentioned control parameters target rotational speed of the printing or embossing means and/or target contact pressure of the printing or embossing means and/or target transport speed of the transport device.

Preferably, step S1 includes applying the base decoration to the workpiece surface. Here are similar or identical application processes as for the additional decoration described were conceivable. Therefore, reference is made to the description above.

The method preferably includes a further step in which the workpiece is reworked. Post-processing can in particular include hardening of the materials applied to the workpiece, in particular the base decoration and the additional decoration. In particular, radiation curing, such as UV radiation curing or electron beam curing, can be provided. In addition, further steps can be taken, such as coating with a sealing layer in order to increase the resistance of the decorative surface produced.

The method preferably includes a further step in which the workpiece is subjected to a further processing step before step S6. Here, for example, an intermediate coating can be carried out in order to create better adhesion conditions for the additional decoration. It can also be provided that marks, edges and also decorative elements of the base decor are removed before the additional decor is applied, as these should not be visible on the final product.

In addition to the method according to the invention, a device for carrying out the method described above is provided. It is clear to the person skilled in the art that device elements mentioned above in the description of the method can also be part of the device described below.

• - eine Erfassungseinrichtung, die dazu ausgebildet ist, ein Basisdekor auf einer Werkstückoberfläche zu erfassen;
• - eine Aufbringungsvorrichtung, die dazu ausgebildet ist, ein Zusatzdekor auf das Werksstück oberhalb des Basisdekors aufzubringen; und
• - eine Steuervorrichtung, die dazu ausgebildet ist, die Vorrichtung sowie deren Elemente entsprechend des oben beschriebenen Verfahrens zu steuern.

According to the invention, a device is provided for carrying out the method described above. The device has the following elements:

• - a detection device which is designed to detect a base decoration on a workpiece surface;
• - an application device which is designed to apply an additional decoration to the workpiece above the base decoration; and
• - a control device which is designed to control the device and its elements in accordance with the method described above.

Preferably, the detection device has a detection means to detect the base decoration on the workpiece surface. As described above, the detection means can work without contact, as is the case with a camera or an inductive or capacitive detection means. However, it is also possible for the detection means to detect the base decoration by touching it, as described above.

Preferably, the detection device has a detection means to detect the base decoration on the workpiece surface. As described above, the detection means can work without contact, as is the case with a camera or an inductive or capacitive detection means. However, it is also possible for the detection means to detect the base decoration by touching it, as described above.

The at least one control device can in particular have a control means which is designed as an electronic data processing unit. The control means can in particular be designed as a computer or control device. It can also be provided that several control devices are provided which control individual elements of the device. For example, a control device can be designed to control the detection of the base decoration and in particular to control the detection device, while a further control device can be designed to control the application device.

The device preferably has, as a further element, an application device which is designed to apply the base decoration to the workpiece surface. The application device is located upstream of the detection device so that the base decoration can be applied to the workpiece and the detection is then carried out. As mentioned above when describing the process, the application of the base decoration can be done in a digital, analog or hybrid way. The application device can therefore be designed accordingly. Furthermore, as described above, it can be designed to apply the base decoration as a two-dimensional decorative image and/or as a three-dimensional structure.

The device preferably has a transport device as a further element, which is designed to transport the workpiece to the individual elements of the device. In this way it is possible to position all elements in a specific sequence along the transport direction of the transport device. In particular, a device can be provided that can process the workpiece in a continuous process.

Preferably, the device has a further element, a post-processing station, which is designed to rework or finalize the workpiece after applying the additional decoration. Post-processing can in particular include curing of the materials applied to the workpiece, in particular the base decoration and the additional decoration. For this purpose, the post-processing station can in particular have a radiation source, such as a UV radiation source or an electron beam source. In addition, the post-processing station can have further post-processing means, such as a coating agent that is designed to coat the workpiece with a sealing layer in order to increase the resistance of the decorative surface produced. Alternatively or additionally, the post-processing station can have cleaning agents and/or material removal agents. Cleaning agents are designed to clean the workpiece. Material removal means are designed to remove material from the workpiece, in particular material from the base decoration and/or the additional decoration. This can in particular include a suction device which is designed to suck off the workpiece for cleaning or which is designed to suck up material of the workpiece, in particular material of the base decoration and/or the additional decoration. A material removal means may include a brush or other mechanical means capable of removing material from the workpiece. Furthermore, it is possible for the cleaning agent and/or the material removal agent to comprise a blower which is designed to direct a fluid stream, in particular an air stream, onto the workpiece in order to carry out the cleaning and/or material removal.

Preferably, the device has an intermediate processing station as a further element, which is designed to subject the workpiece to at least one further processing step before applying the additional decoration. For this purpose, the intermediate processing station can, for example, have an intermediate coating agent in order, for example, to create better adhesion conditions for the additional decoration. It can also be provided that components of the workpiece are removed using the intermediate processing station. This can particularly affect brands, edges but also decorative elements of the basic decor before the additional decor is applied, as these should not be visible on the final product. The workpiece can also be cleaned by the intermediate processing station. The intermediate processing station can have cleaning agents and/or material removal agents as described above in the context of the post-processing station. The intermediate processing station can also be designed to carry out curing, hardening or intermediate drying of the workpiece or components of the workpiece. For this purpose, the intermediate processing station can in particular have a radiation source, such as a UV radiation source or an electron beam source.

The invention is described in more detail below with reference to the accompanying drawings.

• 1a: Vermessungsgrößen, die bei der Erfassung des Basisdekors erfasst werden können,
• 1b: Abweichungen des Basisdekors,
• 2: eine Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens
• 3a, 3b: zeigen beispielhaft Zustände eines Werkstücks 1 bei der Durchführung des erfindungsgemäßen Verfahrens,
• 4: einen beispielhaften Ablauf des erfindungsgemäßen Verfahrens,
• 5a, 5b: eine Anpassung der Sollzusatzdekorvorlage.

Show it:

• 1a : measurement variables that can be recorded when recording the basic decor,
• 1b : deviations from the basic decor,
• 2 : a device for carrying out the method according to the invention
• 3a , 3b : show exemplary states of a workpiece 1 when carrying out the method according to the invention,
• 4 : an exemplary sequence of the method according to the invention,
• 5a , 5b : an adjustment of the target additional decor template.

1a shows measurement variables that can be recorded when recording the basic decor. This is not to be read as limiting the invention. Instead, this is a possibility of carrying out the invention, more precisely, the measurement of the base decoration, in particular if the base decoration is rectangular.

Shown is an example of a rectangularly framed target base decor, which describes a target state for a base decor, or more precisely, its flat extension on a workpiece surface. It has opposite sides a and b and c and d. Further routes a ₁ and a ₂ are drawn parallel to sides a and b. These are located between pages a and b and can, for example, be arranged between the pages in such a way that pages c and d are each divided into three equidistant sections.

The actual sides a, b, c, d as well as the other actually existing sections a ₁ and a ₂ that are present in the base decor actually present on the workpiece are now measured after the base decor present on the workpiece has been recorded of the basic decor recorded. If the base decor is surrounded by an edge, the sides a, b, c, d and the distances a ₁ and a ₂ can be determined by measuring the recorded edge. If there is no edge, marks or decorative elements that are present and recorded on the base decoration can also be used for the measurement, as was explained by way of example above in the general description of the invention. Esp Specially, the four corners of the rectangle and the intersections of the lines a ₁ and a ₂ with the sides c and d can be defined by marks and/or decorative elements of the base decor. In the case shown here, it would be necessary to record the position of eight brands or decorative elements of the actual basic decor.

If the actual base decoration on the workpiece is identical to the corresponding target base decoration, ie if there is no distortion, no incorrect positioning and no twisting of the base decoration on the workpiece, then the sides a, b, c, d and the distances a ₁ and a correspond ₂ of the base decor actually on the workpiece compared to the target base decor. An additional decor can then be applied using the target additional decor template, which has not undergone any adjustment. If there is no identity between the actual base decor on the workpiece and the corresponding target base decor, there will be deviations from those of the target base decor on the sides a, b, c, d and on the sections a ₁ and a ₂ of the actual base decor on the workpiece . An adjustment of the target additional decor template is then necessary in order to achieve a synchronous application of the additional decor to the base decor.

The routes a ₁ and a ₂ can serve in particular to identify distortions of the actual basic decoration. The length and width of the actual basic decor does not necessarily have to be uniform. Instead, it may happen that the base decoration has been distorted in such a way that side b has been elongated compared to side a. With a uniform or linear distortion of the base decoration, the sections a ₁ and a ₂ would increase in width according to their position between the sides a and b. If the distances a ₁ and a ₂ do not correspond to this linear increase, a different, ie non-linear, distortion of the base decor can be assumed.

Corresponding deviations are exemplified in 1b shown.

The dashed line in views 1.1. to 1.4 an actual base decor is shown, which deviates from a target base decor, which is shown by solid lines. The target base decor is rectangular. For reasons of clarity, routes a ₁ and a ₂ are not shown here.

View 1.1 shows a case in which side b is shortened compared to the corresponding length of the target base decoration. Sides c and d, on the other hand, have become longer and converge towards side b. They are therefore not parallel as with the target base decor. The routes a ₁ and a ₂ (not shown) are shortened accordingly. These can, for example, be set equidistant between sides a and b, as described above.

View 1.2 shows another case. Here the length c is shorter and the length d is longer compared to the target base decor, and therefore the side b is no longer parallel to a. The routes a ₁ and a ₂ (not shown) are set here, for example, in such a way that they each divide the sides c and d equidistantly. Accordingly, changes in the length of sections a ₁ and a ₂ may be determined here.

According to the case shown in view 1.3, both sides c and d are extended compared to the target base decor. On the other hand, sides a and b and thus also the routes a ₁ and a ₂ (not shown) have not been changed. This is a case in which an analog application process can also be adapted accordingly by adjusting the target additional decor template. If the additional decor is applied parallel to the sides c and d between the sides a and b, then with the present distortion of the base decor, which has set itself evenly along the courses of the sides c and d and essentially only an elongation of the base decor corresponds to the distortion by changing the control of the analog printing or embossing means. Instead of a rolling movement (ie the relative speed between the printing or embossing medium and the workpiece surface is zero), a sliding movement (ie the relative speed between the printing or embossing medium and the workpiece surface is not zero) can now be set, with which the additional decoration has a distortion in the direction when applied undergoes elongation, so that there is again synchronicity between the basic decor and additional decor.

Finally, view 1.4 shows a widening of side b, while side a has not undergone any change in length. Sides c and d now diverge and are therefore no longer parallel.

The cases shown here can occur in particular if the base decoration is on a stretchable material, such as a plastic film or a PVC film, which has been laminated or glued to the surface of the workpiece. The lamination process or the bonding process can cause a corresponding stretching and/or compression or general distortion of the film and thus of the base decoration. In addition to the cases shown here, other cases are conceivable.

In addition, other methods for applying the base decoration are also conceivable, in particular printing and structuring processes as described above. In the 1b The cases shown and others can also occur through other application methods for applying the base decoration. For example, a two-dimensional decorative image that is applied using analog printing media can have a corresponding error due to a corresponding misalignment of a printing roller used or the workpiece. Correct errors can also occur when using digital printing media, for example when printing material is applied in the wrong place. This applies to both two- and three-dimensional base decors.

2 shows a device for carrying out the method according to the invention.

A device 10 is shown which has a transport device 60 for providing S1 a workpiece 1, on which a workpiece 1 can be transported to the individual elements of the device 10. The workpiece 1 has a workpiece surface 1a on which there is a base decoration.

The workpiece surface 1a is fed with the transport device 60 to a detection device 20, which represents an element of the device 10. With the detection device 20, which has a detection means, the base decoration on the workpiece surface 1a is detected according to step S2. The information from the capture, for example in the form of image data, is forwarded to a control device 40, which is designed here as a data processing means, for example as a computer.

In addition to controlling the individual elements of the device 10, the control device 40 is also designed to measure S3 of the base decoration based on the information from the detection by the detection device 20.

The detection device 20 here has a camera with which it can detect the workpiece surface 1a with the base decoration located thereon. Other embodiments of the detection device 20 can be designed, for example, as described above.

To the right of the detection device 20 is an application device 30, which is enclosed here with a dashed frame. This is designed to apply an additional decoration above the base decoration to the workpiece 1 according to step S6. In the case shown here, the application device 30 is divided from left to right into a coating station 31, a hardening station 32, a structuring station 33 and a further hardening station 34. The application device 30 shown here serves to apply a three-dimensional additional decoration to the workpiece 1. The additional decoration is applied here using a negative structuring process, in which depressions are introduced into a previously applied base layer 1b.

For this purpose, the coating station 31 applies a base layer 1b to the workpiece 1 using applicator rollers. This is placed above the workpiece surface 1a on which the base decoration is located. The curing station 32 is designed to harden the base layer 1b, so that the base layer 1b is in a gelled consistency, i.e. that its flowability has reduced compared to the state immediately after application by the coating station 31. Depressions that are now made into the base layer 1b do not immediately melt again, but last at least until further hardening can take place in order to fix the additional decoration in its shape.

The workpiece 1 with the gelled base layer 1b is fed to the structuring station 33 after the hardening station 32. This is designed to introduce depressions into the base layer by means of a structuring agent that is released onto the base layer in the form of droplets, in that these droplets displace the base layer 1b, for example by mechanical impulse action, whereby a corresponding depression is formed. The structuring station 33 has a digital printing medium for droplet delivery, such as a digital print head or a digital print bar.

The base layer 1b structured in this way is finally fixed in the hardening station 34.

Both curing stations 32, 34 can be designed as UV radiation sources that emit UV light onto the base layer 1b in order to harden it.

The control device 40 is designed to control the application device 30 or at least the structuring station 33 in order to apply the additional decoration to the workpiece 1.

To apply the additional decoration, which is coordinated with the basic decoration, the control device 40 controls the application device 30 on the basis of an adapted target additional decoration template 200 ', which is provided as a digital data record. To generate the adjusted target additional de Cor template 200 ', the control device 40 uses the information about the actual basic decor or actual basic decor that was obtained by the detection device 20. The control device 40 compares this information here with a target base decoration 150, which is also provided as a digital data record.

The target base decor 150 contains information about what the base decor should look like on the workpiece 1. As in the case shown here, this may be actual decor information. In the case shown here, the target base decoration 150 is a digital data set according to which the base decoration was applied to the workpiece surface 1a. However, simplified information about individual basic decor elements can also be included. It can also be provided that the target base decoration 150 contains information about brands and/or an edge of the base decoration as described above, or only has this information.

The control device 40 is designed to determine deviations of the base decor actually present on the workpiece surface 1a from the target base decor 150 and to determine a necessary adjustment from the deviations in order to adapt a target additional decor template assigned to the target base decor 150 so that it is used as an adapted target additional decor template 200 ' Template for the application of the additional decoration provides, after which the additional decoration can be applied at least partially synchronously with the base decoration located on the workpiece 1. One way in which a target additional decor template can be adapted is by means of the 5a and 5b explained further below.

Providing S4 and adjusting S5 of the target additional decorative template can be done by the control device 40.

The adapted target additional decoration template 200 'contains the information, for example as a digital data set, which must be processed by the application device 30, but in particular by the structuring station 33, in order to apply the additional decoration to the workpiece 1. By adapting the target additional decor template to the adapted target additional decor template 200', it is now achieved that feedback about the actual conditions of the base decor (actual base decor) is available on the workpiece surface 1a and so the target additional decor template can be adapted accordingly to the adapted target additional decor template 200'. So if the base decor is not present on the workpiece surface 1a, particularly in terms of alignment, proportion and/or position, the target additional decor template can also be adapted so that it corresponds to what is actually on the workpiece surface, particularly in terms of alignment, proportion and/or position 1a present basic decor is adapted. In this way, it is achieved that a target additional decor template 200′ that is as synchronous as possible is used to apply the additional decor, which is not based on a target base decor, but rather on the base decor that is actually present on the workpiece 1. The application of the additional decoration in accordance with the thus adapted target additional decoration template 200' is then carried out by the control device 40 in that it controls the application device 30 in accordance with the adapted target additional decoration template 200'.

A post-processing station 70 is optionally provided downstream of the application device 30. This can include cleaning agents that have a contact-based or contactless effect. For example, the post-processing station 70 has a brush or another mechanical contact element to remove material from the workpiece 1. It can also be provided that cleaning or post-processing is carried out using a fluid flow. It is also possible that the post-processing station 70 is designed to apply a final coating to the workpiece in order to protect the applied decoration, including the base decoration and the additional decoration.

In a further embodiment, the application device 30 can also be configured to work according to an analog or a hybrid structuring method. You can also apply a two-dimensional additional decoration instead of a three-dimensional structure. This happens, for example, when producing high-quality brochures or posters, where a color printed photo (basic decor) is to be given a different level of gloss in selected areas with a high-gloss varnish (additional decor).

In the above example, the base decoration can be in the form of a two-dimensional decoration, as is the case with a decorative image, for example. In particular, a wooden surface can be represented by the base decor. The additional decoration can then be a three-dimensional decoration that is applied above the base decoration and is coordinated with the base decoration actually present on the workpiece 1 in such a way that it is applied at least partially synchronously therewith. The additional decor is designed in such a way that the basic decor can be recognized through the additional decor. It can therefore be designed to be partially or completely transparent.

In addition to this design of basic decor and additional decor, other designs of both decors are also possible. Both decors can be designed two-dimensionally or three-dimensionally. If both decors are designed two-dimensionally, this involves, for example, the application of a decorative image, the additional decor, above a decorative image that is already present on the workpiece, the basic decor. If both decors are three-dimensional, the application of the additional decor, i.e. a three-dimensional structure, above the base decor corresponds, for example, to a supplement to the base decor with the additional decor. Furthermore, it is possible for the base decor to be designed in three dimensions and for the additional decor to be applied as a two-dimensional decor, for example as a coloring of the base decor, above the base decor.

In the example shown here, the application device 30 is designed to apply a negative structuring to the workpiece 1 as an additional decoration. However, this is not to be understood as limiting. Rather, other application devices are also conceivable, which can be provided in combination with or instead of the application device 30 shown here. The prerequisite for this is that the corresponding application device 30 is designed to process the information of the target additional decoration template so that a corresponding additional decoration can be applied.

The 3a and 3b show exemplary states of a workpiece 1 when carrying out the method according to the invention.

3a shows workpiece 1 before the additional decoration was applied. The workpiece 1 has a base body 1c, which is designed, for example, as a plate or panel. The top of the base body 1c is provided with a primer or adhesion promoter 1d in order to create adhesion between the base body 1c and a PVC film 1e provided above it. The PVC film 1e is printed on its top with a base decoration 2 and coated with a transparent PVC film 1f, through which the base decoration 2 is visible from above. The surface of the PVC film 1e now forms the workpiece surface 1a on which the base decoration 2 is located.

3b now shows the application of an additional decoration 3 as a three-dimensional structure above the base decoration 2. For this purpose, a base layer 1b was applied to the PVC film 1f. This base layer 1b is now applied using droplets 4 from an application device 30, as shown in 2 is shown, structured by the droplets making 4 depressions in the base layer. Due to the adapted target additional decor template, which is adapted to the base decor 2 on the workpiece surface 1a, the additional decor 3 is now created in such a way that a fitting error between the base decor 2 and additional decor 3 is minimized.

4 shows an exemplary sequence of the method according to the invention. Steps S1 to S6 are carried out one after the other in chronological order.

According to step S1, a workpiece is provided that has a surface on which a base decoration is located. The base decor can, as described above, be designed two-dimensionally as a decorative image or three-dimensionally as a structure.

The base decoration located on the workpiece is now detected with a detection device in step S2. This can have a camera in particular for optically detecting the base decoration. Other configurations of the detection device are also possible, as described above. In particular, it can be provided that the detection includes a detection of brands, decorative elements and/or an edge of the base decoration as described above or exclusively concerns the detection of brands, decorative elements and/or an edge of the base decoration.

The base decor is measured after capture in step S3 based on the captured data or information about the base decor. This means that information about the orientation, proportion and/or position of the base decor is determined. As described above, this can be done, for example, via the detected brands, decorative elements and/or an edge of the base decor. However, it can also be provided that the basic decor is measured as a whole. In this way, the base decoration actually present on the workpiece is described in such a way that an adaptation of a target additional decoration template can be determined, which is provided in step S4.

The target additional decor template describes the additional decor that should be applied above the base decor if the base decor does not deviate from a target base decor to which the additional decor is coordinated. The target additional decor template can be designed differently. In particular, it can be present as a digital data record, after which a digital application device can apply the additional decoration.

Based on the detected base decoration, which is already on the workpiece surface, the target is now adjusted according to step S5 additional decor template is carried out in order to adapt the target additional decor template to the base decor actually present on the workpiece surface. This means that the original target additional decoration template is not used to apply the additional decoration according to step S6. Instead, an adapted target additional decor template continues to be used, which has now been adapted to the base decor actually present on the workpiece.

In this way it is achieved that a fitting error between the base decoration and additional decoration on the workpiece is minimized. The adjustment itself can be carried out as explained above in the previous description.

It is clear to a person skilled in the art that steps S1 to S6 do not necessarily have to be carried out in this order. Instead, it can be provided, for example, that steps S2 and S3 are carried out simultaneously or are carried out by the same device, namely the detection device. The target additional decor template can also be provided before steps S1 to S3 or between individual of these steps. Steps S5 and S6 can also take place simultaneously, so that the target additional decorative template is adapted so that the information of the target additional decorative template that is required to carry out the application according to S6 is adapted. In particular, it can be provided that steps S4 to S6 are carried out simultaneously. This means that information necessary for applying the additional decoration is provided from the target additional decoration template according to step S4, this is then adapted according to step S5 and the additional decoration is then applied according to this adapted target additional decoration template. For example, for steps S5 and S6 or S4, S5 and S6, this can be done in such a way that a pixel-based target additional decorative template is provided, with one or more pixel lines being provided in step S4 transversely to the feed direction of the workpiece, which are then adjusted according to step S5 and then the application takes place according to step S6 according to the adapted pixel rows. This process is repeated until the additional decor has been applied in accordance with the entire adjusted target additional decor template.

5a and 5b show how a target additional decor template can be adapted.

View 5.1 shows a workpiece 1 in a top view. The workpiece 1 is rectangular. View 5.2 shows a target additional decor template 200 that has not been further adjusted. The target additional decor template 200 is visualized as an additional decor, here a wood decor. The target additional decor template 200 is designed corresponding to a target base decor (not shown) or to a base decor (not shown) that was applied to the workpiece 1 without deviation from the target base decor. An additional decor that would be applied to a workpiece 1 in accordance with the target additional decor template 200 would then be synchronous with such a base decor on the workpiece 1, which corresponds to the target base decor and has no deviations from the target base decor.

However, a base decoration 2 actually present on the workpiece 1 deviates from the target base decoration, as can be seen in view 5.3. An actual actual base decor 2 is shown here. The causes of such deviations arise from errors or inaccuracies in the application process of the base decoration 2, as already explained above. If the base decoration 2 is applied to the workpiece 1 using an analogous method, an error can, for example, be introduced into the base decoration 2 by a sliding application roller. If the base decoration 2 is laminated using film, an error can be introduced into the base decoration 2 due to stretching, compression or similar distortion of the film. In the present example, the proportion of the base decor 2 is changed in particular in such a way that the right edge of the base decor 2 is set at an angle. View 5.4 shows the actual position of the base decoration 2 on the workpiece 1 and another error that occurred when the base decoration 2 was applied to the workpiece 1. Here the base decor 2 is twisted to the right. I.e. the orientation of the base decor 2 differs from that of the target base decor.

View 5.5 now makes it clear that applying the additional decoration 2 according to the additional decoration template 200 without adapting it leads to a fitting error. The structures of basic decor 2 and additional decor 3 do not match. It is therefore necessary to adapt the target additional decor template 200 to the actual basic decor 2.

It shows how such an adjustment can be made 5b .

View 5.6 shows the workpiece 1 from view 5.4 in which the base decoration 2 is distorted and twisted on the surface. Distinctive points of the base decor 2 are marked with black markings. The striking points can be decorative elements of the basic decor 2. However, other striking points can also be considered, such as marks specially applied for this purpose or the edge of the base decor 2. These prominent points act as synchronization elements 2a and lead to a simplified description of the base decor 2. That is, based on the position of the synchronization elements 2a on the workpiece 1 and based on the synchronization elements 2a to one another, information about the alignment, proportion and/or position of the base decoration 2 on the workpiece 1 can be obtained. In the present example, the synchronization elements 2a should actually be arranged in a regular 4x4 matrix, in which adjacent synchronization elements 2a are arranged equidistantly and aligned with one another in a vertical or horizontal direction in the drawing plane. This is clearly not the case here. Instead, the 4x4 matrix is displayed distorted due to errors in the application of the base decor 2. The synchronization elements 2a are no longer aligned and are no longer arranged equidistant from one another.

View 5.7 now shows the visualized additional decor template 200 before its adjustment. The additional decor template 200 has adjustment elements 200a, which are marked here with circles, which would be positioned synchronously with the synchronization elements 2a of the base decor 2 if there were no errors in the base decor 2. View 5.8 shows the corresponding deviation between the adjustment elements 200a (circles) of the unadjusted target additional decor template 200 and the synchronization elements 2a of the base decor 2 (black markings).

The target additional decor template 200 must now be adapted to the deviations from the basic decor 2. For this purpose, displacement vectors are calculated that result for each individual pair of adaptation element 200a and synchronization element 2a. A displacement vector here represents the positional deviation of a synchronization element 2a from the corresponding adaptation element 200a.

Based on the displacement vectors, the additional decor template 200 is distorted, rotated and adjusted in position using a mathematical model and then fed as a digital data set to an application device which is designed to apply the additional decor. In particular, a vector field can be determined from the displacement vectors, according to which sections of the additional decorative template 200 can also be adapted that do not correspond to one of the adaptation elements 200a. The entire additional decor template 200 is thus adapted so that the additional decor template 200 is adapted to the actual base decor 2. The transfer of the positions of the synchronization elements 2a to the adaptation elements 200a is shown in view 5.9. The result is then an adapted target additional decor template.

The invention is explained below using concrete exemplary embodiments. This will open 2 Referenced. It is clear to a person skilled in the art that individual features can be taken separately and combined with other features mentioned above.

Example 1:

A workpiece 1 filled with a calcium binder in the form of a PVC plate with a thickness of 5.5 mm is thermally laminated with a PVC film printed with a base decoration using a solvent-based gravure printing process (not shown). To do this, the PVC panel is heated to approx. 170 °C using a heated calender and laminated with the printed PVC film. In an alternative exemplary embodiment, a transparent, unprinted PVC film is placed over the above-mentioned printed PVC film and both PVC films are thermally laminated onto the PVC plate in a heated calendar. The printed PVC film has a thickness of 0.2 to 1.5 mm, in an alternative embodiment a thickness of 0.3 to 0.6 mm. The transparent, unprinted PVC film has a thickness of 0.2 to 1.2 mm, in an alternative embodiment a thickness of 0.3 to 0.6 mm. The workpiece 1 produced in this way is fed to the detection device 20 via a transport device 60. After the optical and/or non-optical detection and measurement, the workpiece 1 is fed to an application device 30 using the transport device 60. Here, a first lacquer layer of a UV-curing acrylate lacquer is applied once or several times as a base layer 1b using a coating station 31. In a subsequent curing station 32, this acrylate varnish is hardened with a corresponding dose of UV radiation, the wavelengths of radiation used having a maximum at 395 nm. Hardening is not complete (the double bonds formed when an acrylate varnish hardens and polymerizes are not 100% converted). In a subsequent structuring station 33, a UV-absorbing agent is applied in droplet form to the base layer 1b via digital print heads, so that the base layer 1b is shielded from UV radiation by the agent at the points where the agent was applied. The workpiece 1 treated in this way is then fed to a hardening station 34, which completely hardens the base layer 1b at all points that are not shielded from the agent using correspondingly higher UV powers than the hardening station 32. Furthermore, the workpiece 1 treated in this way is fed to a post-processing station 70. Here, the parts of the base layer 1b that were covered by the agent and are therefore not yet completely hardened even after the hardening station 34 are removed. For example, a brush can be used for this. In the example described here the application of the droplets from the structuring station 33 is digitally controlled. For this purpose, an adapted structure file, the adapted target additional decor template 200 ', is used, which was generated by electronically carrying out the adaptation in the control device 40 from the information from the detection device 20 and the previously existing target base decor 150, which describes a target state of the base decor. The target base decor 150 can, for example, contain information about the target base decor as a whole, or about brands, edges and / or individual decorative elements, which are then used to adapt the target additional decor template to an adapted target additional decor template 200 '.

According to one aspect of the invention, the base decoration is previously applied to the workpiece surface using digital, analog or hybrid application methods. The target base decor can serve as a template for this.

According to one aspect of the invention, at least two decorative elements or marks in the base decor are recognized by the measurement and used to adapt the target additional decor template.

According to a further aspect of the invention, the measurement is carried out without including the target base decoration. In particular, it can be provided that a target base decor does not exist. The adapted target additional decor template 200' is then generated exclusively from the data or information from the measurement and the target additional decor template. This can be done, for example, by adjusting adaptation elements and synchronization elements as described above.

Example 2:

A titanium dioxide-filled decorative paper with a weight of 55 to 80 g/m ² is printed using a gravure printing process with an aqueous ink with a base decor, for example an oak decor. The printing machine receives its printing cylinders in accordance with the specification of a target base decoration 150. During the printing and subsequent drying process, the dimension of the paper changes, for example in the longitudinal and/or transverse direction. The paper is then glued to a 6 mm thick HDF board using a 2-component urea resin/hardener adhesive. Subsequently, the glued and printed paper is coated with a melamine resin mixture in one or more steps, dried back in one or more drying processes to a residual moisture content of less than 30%, preferably less than 15%, and in a hot press under 35 bar pressure and 210 ° C pressed. The workpiece 1 thus obtained is fed to the detection device 20 in order to then be coated with the additional decoration in the application device 30. For this purpose, a UV-curing acrylate varnish is applied to the surface via the coating station 31, which is then passed through the structuring station 33 without any further intermediate steps with the help of digital droplets, which move at a speed of 3-8 m/s. are introduced into the still liquid lacquer layer, structured (in particular negative structuring). The lacquer layer is then cured in station 34. The structuring station 33 is controlled here, just as described in exemplary embodiment 1, via a control device 40, which generates an adapted target additional decor template 200 'from the results of the detection device 20 and stored data for the target base decor 150 in order to control the structuring station 33. The result is a melamine-coated furniture or floor panel that has a lacquered structure (additional decor) on its surface to match the printed oak decor.

Reference symbol list

1

workpiece

1a

workpiece surface

1b

base layer

1c

Basic body

1d

Primer or adhesion promoter

1e

PVC film

2

Basic decor or actual basic decor

2a

Synchronization element

3

Additional decor

3c

Decor element

4

droplet

10

contraption

20

Detection device

30

Application device

31

Coating station

32

Hardening station

33

Structuring station

34

Hardening station

40

Control device

60

Transport device

70

Post-processing station

150

Target base decor

200

Target additional decor template

200'

adapted target additional decor template

200a

Customization element

a

Page

a1

Route

a2

Route

b

Page

c

Page

d

Page

Claims (15)

Method for producing a decorative surface on a workpiece (1) with the following steps: - Step (S1): Providing a workpiece (1) with a workpiece surface (1a) on which there is a base decoration (2); - Step (S2): Detecting the base decoration (2) on the workpiece surface (1a) with a detection device (20); - Step (S3): Measuring the recorded base decor (2); - Step (S4): Providing a target additional decor template (200) for an additional decor (3), the target additional decor template (200) being designed synchronously with a target base decor (150); - Step (S5): Adjusting the target additional decor template (200) based on the measured base decor (2), so that an adapted target additional decor template (200') is present, according to which the additional decor (3) can be applied at least partially synchronously with the base decor (2). ; - Step (S6): Applying the additional decoration (3) to the workpiece (1) above the base decoration (2) according to the adapted target additional decoration template (200 ') with an application device (30), where in step (S3) information about the target base decor (150) is provided and a deviation of the base decor (2) from the target base decor (150) is determined by comparing the detected base decor (2) with the target base decor (150). Procedure according to Claim 1 , wherein the detection of the base decoration (2) in step (S2) takes place contactlessly, optically, capacitively, inductively, and / or in another way. Method according to one of the preceding claims, wherein in step (S2) the detection of the base decoration (2) includes detection of marks of the base decoration (2), and/or wherein in step (S2) the detection of the base decoration (2) comprises detection of at least one edge of the base decoration, and/or wherein in step (S2) the detection of the base decoration (2) includes detection of at least one decorative element of the base decoration (2). Method according to one of the preceding claims, wherein in step (S3) information about the orientation, proportion and / or position of the base decoration (2) on the workpiece surface (1a) is determined. Method according to one of the preceding claims, wherein the information about the target base decoration (150) is provided as a digital data record. Method according to one of the preceding claims, wherein the result from the measurement according to step (S3) and/or the target additional decorative template (200) is provided as a digital data record. Method according to one of the preceding claims, wherein step (S5) comprises that at least the orientation, proportion and/or position of the target additional decor template (200) is adjusted, and/or that adjustment elements (200a) of the target additional decor template (200) corresponding to the base decor (2) can be moved in order to adapt the target additional decor template (200) to the base decor (2). Method according to one of the preceding claims, wherein the base decor (2) comprises a two-dimensional decorative image and/or a three-dimensional structure, or wherein the base decor (2) consists of a two-dimensional decorative image and/or a three-dimensional structure, and/or wherein the additional decor (3) comprises a two-dimensional decorative image and/or a three-dimensional structure, or wherein the additional decor (3) consists of a two-dimensional decorative image and/or a three-dimensional structure. Method according to one of the preceding claims, wherein step (S6) comprises that the additional decoration (3) is applied using a digital application method, an analog application method or a hybrid application method. Procedure according to Claim 9 , wherein the adapted target additional decor template (200 ') is used to control the application method used. Procedure according to Claim 10 , whereby the adapted target additional decor template (200') is available as a digital data set. Procedure according to one of the Claims 8 until 11 , wherein step (S5) includes creating at least one control parameter that is used for control of the application method used. Method according to one of the preceding claims, wherein Step (S1) includes applying the base decoration (2) to the workpiece surface (1a), and/or wherein the method comprises a further step (S7), in which the workpiece (1) is reworked, and/or wherein the method comprises a further step in which the workpiece (1) is subjected to a further processing step before step (S6). Device (10) for carrying out the method according to one of the preceding claims, comprising the following elements: - a detection device (20) which is designed to detect a base decoration (2) on a workpiece surface (1a); - an application device (30) which is designed to apply an additional decoration (3) to the workpiece (1) above the base decoration (2); and - A control device (40) which is designed to control the device (10) and its elements in accordance with the method according to one of the preceding claims. Device (10) after Claim 14 , further comprising the following elements: - an application device which is designed to apply the base decoration (2) to the workpiece surface (1a); and/or - a transport device (60) which is designed to transport the workpiece (1) to the individual elements of the device (10); and/or - a post-processing station (70) which is designed to re-process or finalize the workpiece (1) after applying the additional decoration (3); and/or - an intermediate processing station which is designed to subject the workpiece (1) to at least one further processing step before applying the additional decoration (3).

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