ES2545665T3 - Procedure to produce a structured surface and a plate with a structured surface - Google Patents

Abstract

Procedure for producing a structured surface in a workpiece in the form of a plate (2) of material derived from wood for use as a floor or piece of furniture, - in which on a surface of the workpiece (2) it prints by means of applicator rollers a decorative design of wood, presenting the decorative design of wood areas that have to be perceived as deepening, - in which after the decorative design of wood is applied on the surface of the workpiece (2) a first coating (22) of varnish at least in part optically transparent and - in which by means of an applicator roller (14) having a structured wrapping surface it is applied on the first coating (22) in direct printing process or in printing process indirectly a second coating (24) of varnish at least in part optically transparent with a locally varied distribution of the amount of application of such so that areas with a greater amount of application and areas with a smaller amount of application or no amount of application are provided, and that the second coating (24) forms a negative structured surface, so that the surface structures of the decorative wooden design that really have to reproduce as deepening are made as elevations (28).

Description

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DESCRIPTION

Procedure to produce a structured surface and a plate with a structured surface

The present invention relates to a method and a device for producing a structured surface in a work piece in the form of a plate of material derived from wood for use as a floor or piece of furniture and to a work piece in the form of a plate of material derived from wood for use as a floor or piece of furniture with a structured surface.

The invention finds application in work pieces in the form of a plate of wood-derived materials, especially manufactured from chip plates, medium density fiber plates (MDF plates), high density fiber plates (HDF plates) , hard fiber plates and oriented fiber plates (OSB plates, Oriented Strand Board).

15 The thickness of the workpiece in the form of a plate of wood-derived material is not a limiting feature. On the one hand, the workpiece in the form of a plate can be made as an MDF plate with a thickness of a few millimeters. On the other hand, the workpiece in the form of a plate of wood-derived material may have a thickness of several centimeters. The only condition is that a coating can be applied and the workpiece in the form of a plate is manageable.

20 Therefore, a structured varnish surface is applied to work pieces in the form of a plate of wood-derived material that are used in the field of flooring or pieces of furniture. To do this, in an economical way, after a corresponding pretreatment, a primer is applied on the surface to be varnished first, then a decorative wooden design is printed and finally it is provided with a

25 transparent sealing layer. The applied layers can be composed of several layers, depending on the existing requirements, for example to make a polychrome print or a particularly solid sealing layer. Preferably, the sealing layer is composed of a hardenable varnish, in this case, hereafter referred to as a sealing varnish.

Between the processing steps to apply the different layers, the workpiece in the form of a plate of wood-derived material generally passes through so-called drying tunnels in which at least partial cross-linking of the layers is carried out by the action of thermal energy and / or radiation energy. Hardening and, if necessary, drying are usually carried out by UV radiation or by electronic radiation. In addition, thermal radiation techniques are also known.

35 In order to give the surfaces manufactured in this way a more authentic appearance, the sealing layer is structured. These structures adapt to the decorative wooden design.

For this, two procedures are known in the state of the art:

40 The process known as "chemical pore" uses printing inks or separating agents which, due to their wetting characteristics, make the sealing layers applied to them tend to drain, so that a less thick sealing layer or no sealing layer is formed and In this way, in the hardened state of the coating a structure results. The separating agent can even cause a varnish displacement of

Sealing applied below that bursts during subsequent hardening, such that the desired pore structure is formed as cracks in the surface.

A "mechanical pore" is obtained if after applying the sealing layer, it is crosslinked only in part and then, before the final hardening of the layer, with the aid of a die-cutting cylinder or a pressing tape

The structured structure is printed by pressing the desired structure.

However, with the two procedures mentioned, only unsatisfactory structures in terms of optics and haptic are achieved on coated surfaces.

55 US5,178,928 discloses decorative materials intended as surface materials for furniture, household objects, wall materials and the like and which have three-dimensional drawings of wood grain, whose appearance closely resembles the wood grain of natural trees These decorative materials comprise respectively:

60 a support material with a printed decorative design, comprising a printed layer, whose color and contour resemble those of tracheas; a first transparent or semi-transparent printed layer that covers at least the trachea drawing; and a second printed layer made in a transparent or semi-transparent, but bright, covering the first layer with the exception of the trachea zones, so that above the tracheas represented

65 a deepening of the surface of the decorative material is performed respectively.

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The trachea sections are therefore made in a deepened manner, which corresponds to the appearance of authentic wooden floor boards, since in the authentic wooden floor boards, the veins deepening are formed by the tubes defined by the tracheas (that is, tubes cut in the form of pores and grooves). Therefore, the decorative material results in a positive surface structure. In all the

5 embodiments shown in US 5,178,928, the support material is made of tissue paper.

The present invention has the objective of providing a process with which an improved structure can be achieved economically on a surface covered with a work piece in the form of a plate derived from wood for use as a floor or piece of furniture . It also aims to provide a workpiece in the form of a plate of wood-derived material for use as a floor

or piece of furniture with a corresponding surface structure.

The objective described above is first achieved by a method with the features of claim 1.

According to the invention, it has been shown that the structure is not to be made in an existing layer, especially a layer that is at least partially hardened, but that the surface structure can be made by a selectively varied application of a second coating. By means of the varied application amount of the second coating, a surface structure is created that haptically and / or optically transmits to the observer the impression corresponding to a surface consistency to be imitated.

For this, the first coating and the second coating are at least partly optically transparent.

25 Locally varied application amount generally means that the application amount of the second coating is not evenly distributed over the surface to be coated, but that areas with a greater amount of application and areas with a smaller amount of application or no amount of application are provided application. Since the application of the procedure is not limited to two-dimensional surfaces, it is generally referred to as a spatial distribution, that is to say three-dimensional.

It is not necessary, but it is also preferable that the first coating be a whole surface coating that therefore also especially presents sealing properties for the surface, arranged below, of the workpiece support material.

Hereinafter, the description of the embodiments of the invention will refer respectively to a first coating and a second coating. It is noted that both the first coating and the second coating can be composed respectively of at least two layers or partial layers applied separately. In particular, a second coating can be composed of two or more partial layers, whose structures overlap and / or complement each other.

As a typical application of the process, for example, a wooden surface is imitated by a decorative design in color of a printed layer arranged under the first coating and the second coating and by a structuring adapted to the decorative wooden design.

For this, the varied distribution of the amount of application of the second coating preferably has a structural in the form of lines that is especially typical of the surface structure of a wooden surface.

There are two possibilities of performing the surface structure. On the one hand, the surface structure of the second coating can be made according to the invention as a negative surface structure. In this case, the surface structures that in principle have to be imitated as deepening, for example pores, are made as elevations. This structure, whose relief is for example less than 1mm, especially less than 0.5mm, cannot be differentiated by a human hand and / or visually from a structure with deepening. A negative surface structure is made especially by a line structure.

55 An advantage of the negative pore, that is to say high, is that the surface hygiene features are better compared to a deep pore. It is that in the high structures it is more difficult for impurities to deposit than is the case in the deepening. Especially because of the small size of the pores, the deepened pore structures, such as those also known as laminate floor panels, are very difficult or impossible to clean. Therefore, plates with high negative pores can be used very well in spaces with special hygiene requirements.

Preferably, the thickness of the structures of the second coating is less than 0.1mm. Depending on the amount of application, thicknesses within the range of less than 0.01mm or even 0.05mm are also possible. Even 65 these reduced thicknesses are recognized as a structured surface. The smaller the thickness of the structure, the smaller the amount of application can be adjusted. Not last for reasons

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economic, it is generally advantageous a thickness as small as possible.

On the other hand, the surface structure can be realized in a positive way, constituting the elevated parts of the surface really surface elevations to be imitated. In this case not claimed here, the surface structure 5 is made with a flat surface structure that leaves intermediate spaces free in the form of lines that later appear pores.

In addition, it is advantageous if the locally varied distribution of the amount of application is carried out in such a way that in the areas where a lift is to be performed a maximum coating amount is applied, while in the areas where it is not No lifting is required. No coating is applied. This type of application is especially suitable for a reproduction of a wooden surface.

To prevent the structure from running completely, preferably, the second coating hardens at least in part after application. In addition, it is preferable to minimize the time interval between the application of the

15 second coating and hardening. On the other hand, if the second coating is applied in the form of a preponderantly solid material, for example in the form of a dispersion, the work step of the hardening can be suppressed and for example with only one drying step can suffice.

According to the invention, the second coating is applied as a varnish. A varnish can also be used that is also used as a sealing varnish.

A preferable characteristic of varnish is that the varnish is more easily applied and also constitutes a layer forming material.

25 For this, a so-called high solids varnish is also preferably used. A high solids varnish has a high part of solid substances or solid bodies, the volume part being able to be between 75 and 100%. The solvent content for example is also in the range of 3 to 25%. In part, the denomination 100% high solids varnish is also used, although before the application it must contain a part, although small, of solvent. Because of the high part of solid bodies, after hardening, that is to say after evaporation of the solvent, a perceptible layer of these solid bodies is formed. Because of the low solvent, high solids varnishes are more viscous than other varnishes and can harden more quickly. Since only a small part evaporates, during hardening there is also a lower contraction of the applied structure, which benefits the exact definition of the structuring. In addition, the same varnish is preferably used as in the layer below, because of this

In the same way, due to the same application characteristics, a smooth application is possible. Precisely because of these characteristics it is advantageous to apply high solid varnishes to form the second coating.

Another advantage of the application of high solid varnishes is that during the application it is not possible to expect or expect only small problems due to solvent and that practically all the material applied remains in the workpiece and a notable part is not eliminated during drying . Another advantage of high solid varnishes is that the viscosity can be adjusted within wide ranges. Likewise, it is advantageous that during the hardening of the high solids varnishes a high degree of crosslinking occurs, that is, that the second coating is very stable. In short, the application of high solids varnishes allows to perform

45 a second coating that forms a durable and durable structured surface of the workpiece.

In particular, the varnish may be provided with nanoparticles to present a particularly good sealing characteristic. The abrasion resistance of the varnish layer resulting from the addition of the nanoparticles especially favors surfaces exposed to strong solicitations. This especially refers to pavement panels.

In addition, preferably, the first coating is applied as a sealing varnish. The sealing varnish of the first coating hardens at 65% to 95%, especially 85%, before applying the second coating.

55 This degree of hardening allows, on the one hand, that the second layer of varnish be well bonded to the first layer of sealing varnish. On the other hand, a good stability of the applied structure of the second coating is achieved, so that it is no longer run.

There are several possibilities to highlight the optical effect of the structure of the second coating. On the one hand, an adjustment of a degree of brightness other than the second coating can be chosen compared to the degree of brightness of the first coating. It has been shown that areas with a greater application of layer on the finished surface of the workpiece achieve a greater degree of brightness, while areas with a lower application of layer produce a reduced degree of brightness on the finished surface of the workpiece. Workpiece.

On the other hand, the color of the second coating can be chosen differently from the color of the first coating to accentuate the optical impression of the structured surface. That means that the coatings can be either

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transparent or partly opaque.

Especially, there is the possibility of applying the second coating as a UV-curable pigmented varnish to adjust the degree of brightness and / or the color of the second coating. For this, a source of UV 5 light is needed for proper hardening, but with this configuration of the process, particularly good effects are achieved.

For the performance of the process it has been found that it is advantageous to apply the second coating by means of a roller with a structured surface, especially die cut or made of burr. Therefore, techniques that have already been established in other applications can be used. Depending on the viscosity of the varnish used and the time between application and hardening, the applied varnish layer will not run or run only in part, so that areas with a smaller amount of application are deepened and areas with a higher application amount are high on the finished surface.

15 The surface of the workpiece under the two coatings described can be coated in multiple ways.

In another embodiment of the process, for example, one or more of the following surface coatings that especially determine the optical structure (decorative design) of the workpiece surface can be applied under the first coating:

-a layer of adhesive that has at least one layer, -a primer layer that has at least one layer, -a base layer applied to a roller, which has at least one layer,

25 -a printed layer that has at least one layer and that represents the decorative design, -a varnish layer that contains corundum and that has at least one layer and -a layer of polish varnish that has at least one layer.

As a result of the description of the foregoing procedure, it has been shown that by means of a coordinated quantity application of a second coating, especially of a sealing means with a subsequent hardening, it is possible to obtain a high quality structure of the coated surface.

By choosing different quantities applied in the sealing layer in coordination with the decorative wooden design, a structure that matches the decorative wooden design is achieved. In this way, for example,

35 can provide a surface that has a decorative wooden design with a coordinated porous structure. In this way, the material to be represented by the decorative design is better imitated. You can also talk about a so-called synchronous pore. According to the invention it is provided that the first coating and the second coating are at least partly transparent, so that the decorative design located below can continue to be distinguished through both coatings.

Preferably, for the varnish coating described above, varnishes that are cured using UV radiation are used. However, any other varnish can also be applied for the application of the process according to the invention, if they allow to meet the existing requirements regarding the finished surface of the workpiece, such as scratch resistance, abrasion resistance or adhesion.

45 To improve the properties of the coating substances used, they may be provided with various additives and fillers. For example, hard particles may be provided to improve scratch and abrasion resistance, or called UV absorbers that prevent premature yellowing of the surface.

The object mentioned above is achieved according to the invention in addition by a workpiece in the form of a plate with the features of claim 13. The workpiece in the form of a plate according to the invention for use as a floor or piece of furniture comprises a material of plate-shaped support of wood-derived material, a decorative wooden design printed on the support material, a first coating of varnish at least partly optically transparent, following the decorative wooden design, and a

The second coating is at least partly optically transparent, formed by varnish, which is applied with a locally varied distribution of the amount of application on the first coating with the aid of a direct printing process or an indirect printing process and forming a negative surface structure in which the surface structures of the decorative wooden design that in principle have to be reproduced as deepening are made as elevations.

More embodiments of the workpiece according to the invention are indicated in the dependent claims, respectively resulting in the same properties and advantages as described in relation to the procedure described above.

The object mentioned above is achieved according to the invention also by a device with the features of claim 22. The device according to the invention for producing a structured surface in

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A workpiece in the form of a plate of material derived from wood for use as a floor or piece of furniture comprises: -at least one treatment station (18,20), which has an applicator roller, for printing a

Decorative wooden design, 5-a treatment station (6), which features an applicator roller (10), to apply a first coating

(22) of varnish at least partly optically transparent, following the decorative wooden design, on the surface of the workpiece in the form of a plate (2) and

-a treatment station (8), which has an applicator roller (14) having a structured wrapping surface, for direct or indirect printing of a second coating (24) of varnish, at least in part optically transparent, in the first coating (22), and applying the second coating (24) with a locally varied distribution of the amount of application in the first coating (22), the structured wrapping surface of the applicator roller (14) defining a surface structure to create a structure negative surface in the plate-shaped workpiece (2), so that the second coating (24) forms a negative surface structure in which surface structures of the design

15 decorative wood that in principle have to be reproduced as deepening are made as elevations (28).

More embodiments of the device according to the invention are indicated in the dependent claims which are also described in detail in the following description of the preferable embodiments.

In the following, the invention is described in detail with the aid of exemplary embodiments with reference to the attached drawing. In the drawing they show

Figure 1 a schematic representation of a device for producing a structured surface in 25 work pieces in the form of a plate with an arrangement of applicator rollers, Figure 2 a schematic representation of an applicator roller for the direct application of a second coating, the Figure 3 a schematic representation of an applicator roller for indirect application of a second coating, Figure 4 a schematic representation of an applicator roller with a profiled scraper for direct application of a second coating in the form of lines, Figure 5 a representation schematic of a device for producing a structured surface in work pieces in the form of a plate with a digital application device, figures 6a, b a schematic representation of a structured surface, figures 7a-c a schematic representation of a form of embodiment according to the invention of an s a structured surface and figure 8 a schematic representation of another embodiment of a structured surface.

Figure 1 shows in a schematic form a device for producing a structured surface in a workpiece which in the present case is made as a plate 2.

Several plates 2 are arranged on a conveyor belt 4 that are supplied individually and successively to different treatment stations. The direction of transport is indicated by an arrow in Figure 1 and is from left to right. Instead of several individual plates 2, it is also possible to treat a piece of

45 large surface work or a workpiece manufactured endlessly which after the treatment described hereafter is divided into individual plates 2.

The treatment stations 6 and 8 shown in Figure 1 have in common that with them a coating is applied respectively. In the present embodiment, however, the two coatings are composed of the same varnish. However, the invention is not limited thereto, that is to say that different material coatings can also be applied by the treatment stations.

In the treatment station 6 a first coating of a varnish is applied substantially throughout the surface. For this, the treatment station has an applicator roller 10 that applies a uniform layer of

55 varnish on the surface of the plates 2. In the post-connected further treatment device 12, the applied coating is dried at least in part and hardens. The further treatment device 12 can cause drying and hardening, for example, by a stream of hot air or by electromagnetic radiation, especially UV radiation. For this, the further treatment device 12 has corresponding means for producing the hot air stream or the radiation.

In a treatment station 8, a coating of a varnish is directly applied by means of an applicator roller 14, the amount of application varying locally. In this way, an intentional structuring of the top varnish layer results. The local structuring of the varnish layer is especially produced by an engraving roller, on whose surface different sections with different height levels are made.

65 Usually, the surface of an engraving roller is machined by buril or by engraving to produce

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individual deepening, called cups, usually in the form of rhombus, with different depths During printing, an ink or a varnish is applied which is received in the deepening so that during the transmission to another medium it passes in part of the deepening to the surface of the medium.

5 In the post-connected further treatment device 16, the last applied coating is hardened at least in part to fix the locally distinct structure before it is leveled again by running. During this hardening step, a hardening, if not yet finished, of the coating provided below, applied in the first treatment station 6, can also occur.

10 It has proved to be advantageous if the two layers of varnish are composed of the same varnish, since in this way the joining of the two coatings is facilitated. However, on the contrary, different compositions of the two coatings can also be chosen, for example to highlight or increase the surface effects of the structuring. The differences may consist, for example, in the color of the two coatings or in the degree of brightness.

15 Figure 2 shows an applicator roller 14 which in a direct printing procedure applies the varnish on the surface of the plate 2. The arrow in turn indicates the direction of movement of the plate 2. The structured surface 15 of the applicator roller 14 (the structuring cannot be seen in detail) receives the varnish, adjusting the amount of varnish L through a scraper 17. By means of a rotation of the applicator roller 14 the structure is then structured

20 varnish, that is to say that it is transmitted directly, with a locally varied distribution, to the surface of the plate

2. Therefore, this procedure is also called direct printing procedure.

Figure 3 shows the same roller 14 that in this embodiment is not used as a direct applicator roller, but rather transmits the varnish adhered first to a separate applicator roller 19 which preferably

25 has an elastic roller surface, preferably glued. From the applicator roller 19, the varnish transmitted by the roller 14 is then transmitted to the surface of the plate 2. The rest of the varnish L is scratched with the help of another scraper 21 during the next rotation of the applicator roller 19, before it returns to be transmitted varnish by roller 14. This procedure is also called indirect printing procedure.

30 Figure 4 shows another embodiment of the applicator roller arrangement. In this case, in a roller applicator 14 with a smooth surface, a separate scraper 17 is applied by means of a scraper 17. After application on the surface of the plate 2 a line structure then results. The thickness of the varnish cords, their distances and their diameters can be freely chosen by adjusting the profiling. Furthermore, by means of a preferably oscillating movement of the scraper transversely with respect to the

35 direction of the plate 2 it is possible to produce a wave-shaped arrangement of the varnish cords on the surface of the plate.

Another embodiment of the arrangement of scrapers consists in that instead of a profiled scraper 17 two profiled scrapers are provided identically. If the two scrapers are oriented towards each other, the

40 varnish cords are applied on the surface of the roller. If the two scrapers are offset with respect to each other, the application of varnish cords is interrupted. By selective displacement relative to each other, interrupted structures can be produced in this way.

Figure 5 shows an embodiment of a device for producing a structured surface in a

Plate 2, in which a digital application device 30 for applying the second coating is provided instead of the applicator roller arrangement described above. In the present example a jet printing technique is used that is especially extended in so-called inkjet printers. In figure 5, below the application device is shown a short line indicating the series of droplet jets. It is assumed that the application device applies the varnish temporarily transversely with respect to the direction

50 of movement of the plate 2. Likewise, it is possible to load a surface respectively with droplets to increase the application speed.

In addition, a computer 31 as a means of producing a point distribution for controlling the digital application device is connected to the application device 30. The computer 31 processes digital information of

55 control and transmit it to the application device.

As in the other application devices, following the digital application device is a further treatment device 32 for drying and hardening at least in part the second previously applied coating.

60 In addition, an optical scanning device 34 for recording the surface pattern of the first coating is advantageously provided. During operation, the optical scanning device registers the surface and transfers the recorded data to the computer 31. The computer 31 then calculates from the measurement values of the optical scanning device 34 a distribution of points to be produced. This applies

65 then as a second coating with the digital application device 30.

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The optical scanning device can be made as a scanner, as a linear camera or as a surface camera. The objective is in any case that the optical scanning device records the surface with a resolution or evaluates the data captured with a resolution with which the digital application device must apply the second structured coating.

5 By a time delay that depends on the transport speed of the plate 2 and the distance between the optical scanning device 34 and the digital application device 30 it can also be achieved that the digital application device 30 applies the second coating structured on the surface so that the surface structure coincides at least in part with the optical drawing. In other words, a synchronous haptic and optical configuration of the surface of the plate 2 can be achieved in this way.

In Figure 1 it is further represented that, before the application of the two coatings described above by means of the treatment stations 6 and 8, the surface of the plates 2 is provided respectively with a coating by means of two additional treatment stations 18 and 20. They can be especially layers

15 varnish with which a bicolor surface is produced, a decorative design. Similar to what has been described above, the treatment stations 18, 20 have application devices and subsequent treatment devices without these being described in detail here.

Pre-varnishing is an especially preferable embodiment, since the surfaces produced in this way are completely varnished and can therefore be produced in an installation.

The two treatment stations 18 and 20 apply a varied drawing on the surface, specifically, a decorative wooden design. For this, the two applicator rollers of the treatment stations 18 and 20 are synchronized to apply chromatic drawings that match each other and complement each other. In addition, the

25 engraving roller 14 is provided with a surface engraving, the reproduction of which also coincides with the printing images applied by the treatment stations 18 and 20. In addition, the rotation of the engraving roller 14 is synchronized with the rotation of the applicator rollers of the treatment stations 18 and 20, such that the locally varied distribution of the second coating coincides with the printing image applied by the treatment stations 18 and 20. In this way, a varied distribution of the varnish layer can be achieved superior, synchronized with the printed drawing, namely a pore structure suitable for the decorative wooden design.

Of course, additional treatment stations can also be added to the treatment stations 18 and 20 described.

35 Figures 6a and 6b show an exemplary embodiment of a structured surface of a plate 2. A first coating 22 of a varnish has been applied over the entire surface of the plate 2. In addition, a second coating 24 having a locally varied distribution of the application amount has been applied to the first coating 22. The variation means in this case a pore structure intended to mimic a decorative wooden design. The pores are made as elongated cavities 26, as can be seen especially in the enlarged view in Figure 6b. The second coating 24 is therefore constituted by the areas that are not made as deepening.

In this schematic representation, the pores 26 are represented substantially rectangularly in

45 cross section with slightly rounded edges. However, in practice a distribution may be produced that differs more clearly from the rectangular shape, since the zones of the second coating 24 in the marginal areas of the cavities 26 are partly run before hardening. Therefore, in the case of real cavities 26 rounded corners are expected.

The local distribution, represented in Figure 6a, of the amount of application of the second coating leads to a pore structure in which the pores actually constitute deepening in the coating 24. This structure can also be called a positive surface structure.

Figures 7a to 7c show a similar surface structure of a second coating 24 in which the pores

55 are made as elevations 28. Therefore, such a surface structure can be called a negative surface structure. It is that the pores that in principle would be expected as deepening are made as elevations. As already mentioned above, the size of the structures is so small that by observing it normally a user cannot distinguish the negative surface structure from a positive surface structure.

Therefore, the second coating 24 is composed of areas that have been applied as elevations, that is, for example as negative pores. Therefore, the surface occupied by the second coating is significantly smaller than in the surface structure according to Figures 6a and 6b.

65 Especially Figure 7b shows in an enlarged view the cross-sectional shape of the negative pore. As already described with respect to the cross section of the positive pore according to Figures 6a and 6b, here, the shape of

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Pore cross section is represented with rounded edges. This form is expected when the applied varnish is partly run on the originated edges, before hardening. Figure 7b shows a continuous extension of the elevation or the negative pore 28. Figure 7c shows in contrast a substructure existing within the applied negative pore 28. This substructure is constituted by

5 individual elevations 29 separated from each other, produced by the application techniques described above.

On the one hand, said substructure can be produced in case of application by means of a roller with a structured wrapping surface made by die-cutting or buril, that is, if the surface has individual cups that respectively transmit the adhered varnish. Since the cups are separated from each other, also the droplets of

10 transmitted varnishes are separated from each other on the first coating 22 producing the substructure.

On the other hand, such a structure can be produced if a digital application device is used. Also in this case, the varnish is applied in the form of droplets on the first coating 22, so that, depending on the distance of the droplets on the surface of the first coating 22 a more or less substructure is formed

15 pronounced.

In Figure 7c, the individual elevations are represented in rectangular form. However, in this case, the aforementioned effect of partial shifting before hardening is also valid, so that it is necessary to start from the fact that the individual elevations merge at least partly between them. This effect is

20 produces so much more that the individual elevations are arranged much closer to each other than is the case in the total pore structure according to Figure 7b, described above.

Figure 8 shows by way of example a geometric drawing of the locally varied distribution of the amount of application of the second coating. The depicted drawing constitutes a diamond pattern that presents 25 deep and elevated diamonds. In this form of the local distribution one cannot distinguish between a negative structure or a positive structure, since there is the same number of elevated areas as in deepened areas.

Hereinafter a possible method of examination is indicated with which a surface structure of the type described above can be examined. The important thing is to be able to solve and detect up to structures of the order of 0.01mm.

30 The procedure is based on the principle of the known light section procedure with optical triangulation, based on a relative movement of the measuring cell and the measuring object. The mode of operation consists in illuminating the surface area to be measured in a linear way with a suitable light source (laser) and detecting with the help of a surface camera the strip of light projected on the object. The

35 normal surface lighting and camera are inclined relative to each other at a triangulation angle. The camera then sees the projection line as a height line that reproduces the contour of the test object and from whose coordinates and corresponding positions a three-dimensional profile can be calculated. The resolution of known techniques reaches an accuracy of less than 0.1 µm in the vertical direction.

With the help of such a procedure, the structured surface of the second coating can be examined and analyzed.

Likewise, an analysis of surface structures is possible with the help of microscopes. Four. Five

Claims (20)

1. Procedure for producing a structured surface in a workpiece in the form of a plate (2) of material derived from wood for use as a floor or piece of furniture, 5 -in which on a surface of the workpiece (2) a decorative wooden design is printed by means of applicator rollers, the decorative design of wood presenting areas to be perceived as deepening, -in which after the design Decorative wood is applied on the surface of the workpiece (2) a first coating (22) of varnish at least in part optically transparent and -in which by means of an applicator roller (14) having a structured wrapping surface is applied on the first coating (22) in direct printing process or in indirect printing process a second coating (24) of varnish at least in part optically transparent with a locally varied distribution of the amount of application such that areas with a 15 greater amount of application and areas with a smaller amount of application or no amount of application, and that the second coating (24) forms a negative structured surface, so that the surface structures of the decorative wooden design that are truly to be reproduced as deepening are performed as elevations (28).

2.

Method according to claim 1, wherein the elevations (28) of the negative surface structure are made in the form of lines.

3.

Method according to claims 1 or 2, wherein the second coating (24) is applied while

provided with nanoparticles. 25

Four.

Method according to one of claims 1 to 3, wherein the first coating (22) is applied as a sealing varnish provided with nanoparticles.

5.

Method according to one of claims 1 to 4, wherein the varnish is made as a high strength varnish.

6.

Process according to one of claims 1 to 5, wherein the varnish of the first coating (22) hardens at between 65% and 95%, especially 85%, before applying the second coating (24).

Method according to one of claims 1 to 6, wherein the degree of brightness of the second coating is performed differently than the degree of brightness of the first coating (22).

8.

Method according to one of claims 1 to 7, wherein the second coating (24) is applied as a pigmented sealing varnish, UV curable, to adjust the degree of brightness and / or the color of the second coating.

9.

Method according to one of claims 1 to 8, wherein the second coating (24) hardens after application.

Method according to one of claims 1 to 9, in which, before applying the first coating (22), one or more of the following coatings are applied on the surface: -a adhesion promoting layer that has at least one layer, -a primer layer that has at least one layer, -a base layer applied to a roller, which has at least one layer, -a printed layer that has at least one layer a layer and representing a decorative design, -a layer of varnish containing corundum and presenting at least one layer and -a layer of polishing varnish that has at least one layer. Method according to one of claims 1 to 10, wherein the amount of application for the second coating (24) is adjusted such that the thickness of the structures of the second coating is less than 0.1mm.

12.

Method according to one of claims 1 to 11, wherein the second coating (24) is applied with a distribution adapted to the decorative design of printed wood.

13.

Workpiece in the form of a wood-derived material plate for use as a floor or piece of furniture with a structured surface, specially manufactured according to a method according to one of claims 1 to 12,

65 -with a plate-shaped support material (2) of wood-derived material, 10 -with a decorative wooden design printed on the support material (2) and that has areas that have to be perceived as deepening, -with a first coating (22) of varnish at least in part optically transparent, applied after the design decorative wood and 5 -with a second coating (24) formed by varnish, at least in part optically transparent, which is applied with a locally variable distribution of the amount of application on the first coating (22) with the help of a direct printing procedure or an indirect printing procedure, such that areas with a greater amount of application and areas with a smaller or no amount of application are provided, and that forms a surface structure negative in such a way that surface structures of the 10 decorative wooden designs that are truly to be reproduced as deepening are made as elevations (28). 14. Workpiece according to claim 13, characterized in that the variable distribution of the quantity of application of the second coating (24) forms a structure (26, 28) in the form of lines. fifteen 15. Workpiece according to claims 13 or 14, characterized in that the elevations (28) of the second coating (24) have a substructure composed of individual elevations (29) separated from each other. 16. Workpiece according to one of claims 13 to 15, characterized in that the second coating 20 (24) has nanoparticles. 17. Workpiece according to one of claims 13 to 16, characterized in that the first coating (24) is composed of a sealing varnish with nanoparticles. 18. Workpiece according to one of claims 13 to 17, characterized in that the degree of brightness of the second coating (24) is performed differently than the degree of brightness of the first coating. 19. Workpiece according to one of claims 13 to 18, characterized in that one or more of the following surface coatings are provided under the first coating (22): 30 -a adhesion promoting layer that has at least one layer, -a primer layer that has at least one layer, -a printed layer that has at least one layer and represents a decorative design, -a applied base layer by roller, which has at least one layer, 35 -a layer of varnish containing corundum and presenting at least one layer and -a layer of polishing varnish having at least one layer. 20. Workpiece according to one of claims 13 to 19, characterized in that the thickness of the structures of the second coating (24) is less than 0.1mm. 40 21. Workpiece according to one of claims 13 to 20, characterized in that the second coating (24) is applied with a distribution adapted to the decorative design of printed wood. 22. Device for producing a structured surface in a workpiece in the form of a plate (2) of material 45 derived from wood for use as a floor or piece of furniture, -With at least one treatment station (18, 20), which has an applicator roller, for printing a decorative wooden design, which has areas that should be perceived as deepening, -with a treatment station (6) , which has an applicator roller (10) for applying a first 50 coating (22) of varnish at least in part optically transparent, following the decorative wooden design, on the surface of the workpiece in the form of a plate (2) and -with a treatment station (8) presenting a roller applicator (14) having a structured wrapping surface, for direct or indirect printing of a second coating (24) of varnish, at least in part optically transparent, on the first coating (22), and applying the second coating 55 (24) with a locally variable distribution of the amount of application in the first coating (22), so that areas with a greater amount of application and areas with a smaller or no amount of application are provided, defining the structured envelope surface of the applicator roller (14) a structured surface to create a negative surface structure in the plate-shaped workpiece (2), so that the second coating (24) forms a negative surface structure, such that structures 60 surface wooden decorative designs that are truly to be reproduced as deepening are made as elevations (28). 23. Device according to claim 22, characterized in that the treatment station (8) for application of the second coating (24) has a further treatment device (16) for drying and / or hardening of the second coating. eleven 24. Device according to claims 22 or 23, characterized in that the treatment station (6) for the application of the first coating has a further treatment device (12) for drying and / or hardening of the first coating (22). 12