WO2008061791A1 - Coated board of wood-based material - Google Patents

Coated board of wood-based material Download PDF

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Publication number
WO2008061791A1
WO2008061791A1 PCT/EP2007/010215 EP2007010215W WO2008061791A1 WO 2008061791 A1 WO2008061791 A1 WO 2008061791A1 EP 2007010215 W EP2007010215 W EP 2007010215W WO 2008061791 A1 WO2008061791 A1 WO 2008061791A1
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Prior art keywords
coating
hardness
absolute value
mm
depth
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PCT/EP2007/010215
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German (de)
French (fr)
Inventor
Dieter DÖHRING
Hans Schäfer
Udo Hanitzsch
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Kronoplus Technical Ag
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/06Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wood
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00Processes for applying liquids or other fluent materials
    • B05D1/40Distributing applied liquids or other fluent materials by members moving relatively to surface
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/06Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
    • B05D3/061Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
    • B05D3/065After-treatment
    • B05D3/067Curing or cross-linking the coating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/02Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a matt or rough surface

Abstract

The present application relates to a coated board of wood-based material and a method for coating a board of wood-based material, wherein the board of wood-based material is in particular a wall panel or floor panel or is intended for producing such a panel, comprising a front side and a rear side, wherein at least the surface of the front side is provided with a polymer coating and wherein the polymer coating has a hardness gradient, so that the hardness of the polymer layer decreases with increasing depth from the surface.

Description

Coated wood panel

1. Field of the Invention

The present invention relates to a coated wood particle board, in particular for producing a floor, ceiling or wall covering, and a method for coating a wood material board.

2. background

From the prior art, a plurality of covering plates on wooden base material is known. In the simplest case, such a plate of solid real wood. However, such plates made of solid wood are very expensive and can be laid as panels only by well-trained professionals. However, such so-called real wood floors provide a very attractive interface. To avoid the high cost of real wood floors while allowing the attractive surface of such floors, veneer covering panels were developed. In veneer comes to thin sheets, typically 0.3 to 0.8 mm, from a high quality wood which are glued to a carrier material. The support materials are usually made of expensive wood materials and are considerably thicker than the veneer layer. A disadvantage of such coatings is the relatively sensitive surface that can be easily damaged, for example, by moisture or by mechanical action.

Next laminate panels for floor or ceiling coverings are known from the prior art. Compared to the input pad plates called laminate panels are relatively inexpensive. Laminate panels are usually made of a 4 to 12 mm thick carrier plate of MDF or HDF material, so a relatively cheap wood material, on top of a printed with a decor paper is glued on. located on the underside of the support plate generally a so-called backing paper, which is intended to counteract warping of the support plate by the applied decorative layer. In order to improve the durability of the decorative layer, a so-called overlay paper is applied to this normally provided with a resin such as an amino resin is impregnated and in the very fine abrasion-resistant particles, such as Alumuniumoxidpartikel applied. By compression under heat and pressure, the various layers of the laminate panels are assembled and cured, the resins used. It thus creates a durable, abrasion-resistant decorative surface.

In order to improve the durability and thus the optical properties of wood-based panels, such as those used for example for wall, ceiling or floor panels, in the prior art, various coating methods and materials have been proposed. to such coatings to increase the durability of the surfaces of real wood and laminate panels listed above can be applied to any type of wood panel in principle, incl..

From WO 2007/042258 Al a method for coating a wood material board is known, for example, in which in a single coating step, a relatively thick protective layer is applied from plastic material to the surface of a plate. The plastic material used is a polymerizable acrylate that can cure by a polymerization. The polymerization is initiated by irradiation, so that the thickness of the deposited layer takes place complete conversion.

Starting from this prior art, has as its object a coated wood particle board, and a method for coating a board having particularly advantageous mechanical properties. These and other objects, which will be called upon reading the following description, or may be recognized by those of the art are attained with a coated wood particle board according to claim 1 and a method for coating according to claim. 9

By the present invention, in optically good transparency of the coating and also good brilliance of a lower or applied in the print image, abrasion values ​​of the highest abrasion class AC 5 obtained according to prEN 15,468th The surface is characterized by a high micro-scratch resistance (Mar-Resistance) and impact resistance according to class 33 (prEN 15468). The characteristic values ​​of chemical and water vapor resistance, chair castors and Möbelfußtest correspond secure the prEN 15,468th Further, the method allows a surface which, in addition to the pressure, a deep embossed decorative structure, for example a brushed wood structure or a stone structure, can be introduced. The invention is thus particularly suitable for providing floor panels.

3. Detailed Description of the Invention

The coated wood material board is in particular a floor, ceiling or wall panel, or a wood-based panel intended for further processing into a floor, ceiling or wall panel is provided and comprises a front and a back, wherein at least the surface of the front side is provided with a polymer coating , The term wood particle board is to be understood broadly and includes, for example both sheets of natural wood as well as sheets of MDF, HDF, particle board, composite panels, OSB boards, etc. The engineered wood board can continue with additional coatings, papers, veneers or the like on their surfaces of the front and be provided / or rear side. Thus, if a coating of the surface of the wood particle board is mentioned, this does not necessarily mean a direct coating of the wood material board, but the same can for example be provided with a decorative paper, wherein the coating then the - A -

Dekoφapier is applied. According to the invention, the polymer coating, after curing, a hardness gradient, so that the hardness of the polymer layer decreases with increasing depth viewed from the surface. That is, the polymer layer has on its outer surface preferably has the greatest hardness and in the vicinity of the interface between the coating and the surface of the wood material board, the lowest hardness, with a decreasing course between the two extremes.

So far, it has always been desired over the entire layer thickness to achieve the highest possible hardness. The coating according to the invention differs from this teaching, yet surprisingly leads to very good mechanical durability values. One explanation may be that no large jumps occur through uniform possible drop in hardness in the properties of the coating and it is therefore particularly durable.

The present invention also relates to a method for coating a wood material board, in particular a floor, ceiling or wall panel, or a wood based material which is further processed into flooring panels, wherein a first liquid coating composition is applied to a wood material board in a first step and to the still wet first coating means a second liquid coating composition is applied, where the liquid layers according to the physics of liquids penetrate each other. In this case, a gradient of the concentration of both liquids to each other is produced. While in the outer areas of the total layer (upper side or lower side of the total layer), the respective liquid to the original individual layers is dominant, there is to the center and to the respective other side of the layer a concentration gradient of the first liquid or the second liquid. Ideally, the respective concentration profile corresponds to a straight line. Since interference can occur to the ideal case with highly viscous liquids at short mixing times, it must be assumed that the actual concentration curves correspond only approximately straight and variations are possible. Are the liquids, for example, polymerizable acrylate systems, which differ in the double bond portion, it follows from the above, that similar to the concentration gradient of the two liquids with each other, a gradient in the number of double bonds originating from one side to the other side of the layer. If one sets a polymerization in such a layer, for example by UV excitation, in motion and it is believed that under inert conditions occurs virtually complete conversion of the double bonds, the result is a polymer layer having a gradient of cross-linking sites. While the side with high double bond concentration is accordingly highly crosslinked, the other side has to show the lower double bond content correspondingly lower networking. According to polymer physics, the hardness is an information for crosslinking density in such a system. For example, the micro hardness (Martens hardness DIN EN ISO 14577) within a correspondingly generated from two polymerizable liquid layer is measured, the result is analogous to the cross-linking density, a hardness gradient. The layer can be removed in stages, for example with a Taber Abraser test in accordance with EN 13,329th The curve of the hardness gradient corresponds in exactly the same way the above-described concentration gradient of the two liquids. Ideally, the mixing of the fluids lines occur. In practice, however, more variations will occur to the line. Mathematically, therefore, be expected that the function y = f (x) has a different from a straight line (where y is the Martens hardness and the excavation depth x in the layer).

The person skilled in the relationship shown is illustrated by the following example:

A HDF panel comprises a first layer of 45 g / m 2 is rolled over a roller applicator, wherein the coating agent of the first layer consists, for example to 35% of a 1, 6-hexanediol diacrylate and 65% of a polyester acrylate. On this layer a second layer having a weight of 40 g / m 2 is applied immediately thereafter, wherein the coating agent of the second layer consisting for example of a mixture of 70% polyurethane, acrylic acid ester and 30% dipropylene glycol. Both layers contain a photoinitiator present. The liquid total layer thus formed is exposed under a nitrogen atmosphere to UV radiation and polymerizing the total layer. The double bond sales lies at about 98%.

For the investigation of the resulting coating, the coating was then gradually removed with the Taber Abraser test in each case by 200 revolutions (described in EN 13329). When reaching an abrasion stage, the Martens hardness was measured. If one bears in a rectangular coordinate system on the y-axis the measured Martens hardness in N / mm 2 and on the x-axis the corresponding depth of wear in microns on, the result is approximately a straight line with the function y = 134.8-1 , 03 x. The coefficient of determination was found to be 87.8%, which shows for wood materials, a very high accuracy of the mathematical relationship.

If coatings of the invention are used for example for a durable flooring, the layers can also be provided with abrasion-resistant particles, such as fine corundum particles. This can, for example, before the coating process in one of the two or in both coating agents in a dispersion to be present or can be sprinkled onto the still wet but already applied coating agent in a separate process step.

The skilled artisan will recognize from the present description of the invention that, depending on application, coating agents may be used by other than the preferred concentrations specified in the example. Preferably, the concentration of 1, 6-hexanediol diacrylate between 10 and 60% can, particularly preferably between 20 and 40%, lie; the concentration of polyester between 40 and 90%, particularly preferably between 50 and 80%; the concentration of polyurethane acrylic ester 45-95%, particularly preferably between 55 and 75% and the concentration of dipropylene between 5 and 55%, particularly preferably between 15 and 35%. These substances are intended to illustrate the principle of a layer with hardness gradient based on a preferred embodiment. Of course, instead, be used a variety of other polymerizable or other substances. Polymerizable acrylates are particularly preferred materials for the coatings described herein.

The coating agent of the first, and both the second and further layers may consist of a single polymerizable substance or mixtures of substances. Particularly suitable substances are polymerizable acrylates in general and in particular the substances: 1, 6-hexanediol, polyester, polyurethane acrylate and dipropylene. Particularly suitable for the first layer is a mixture of 1, 6-hexanediol diacrylate, and polyester acrylate. For the second layer comprises a mixture of polyurethane acrylate and dipropylene glycol is particularly suitable.

m the coating compositions may be present other additives, such as flow auxiliaries, wetting aids, dyes, abrasion resistant particles etc .. It is essential that these further components allow the crosslinking or penetration described above and a polymerization is still possible.

In selecting the coating material for the individual layers, the substances listed are preferred, but the skilled artisan will appreciate that it is not explicitly depends on the use of the substances listed, but essentially on providing polymerizable coating compositions. 4. Detailed description of exemplary embodiments

In the following, a detailed description of exemplary embodiments will now be given with reference to the attached diagrams and drawings.

Fig. 1 is a schematic representation of a

Coating process;

Figs. 2A to 2C are schematic diagrams in which the flow of the second liquid mixing layers is shown;

Fig. 3 is a diagram showing the course of the hardness

represents a function of the depth of the coating;

Fig. 4 is a diagram illustrating the upper and lower limits of the hardness gradient according to a preferred embodiment of the invention;

Fig. 5 is a diagram illustrating the upper and lower boundaries of a more preferred embodiment of the invention; and

Fig. 6 is a diagram illustrating the upper and lower limits of the hardness gradient a still further preferred embodiment.

In Fig. 1, a coating system for coating of wood-based panels 10 is shown schematically. The wood-based panels 10, such as solid wood boards, HDF, MDF or particle board are guided over a roller conveyor 12 through the various stations of the coating installation. In a first coating station 14, a first liquid coating means 20 is applied in a continuous coating on the wood-based panels 10 by means of a rotating applicator roll roller 15th The application roller 15 is supplied via a supply means 16 with coating agent. In the second coating station 17, a second liquid coating means 21 is applied via a further rotating applicator roller 18 on the still wet first coating means 20th The applicator roll 18 is powered by a supply device 19 with the second liquid coating means. The job can of course also with any other suitable method of application, such as a sprayer or a doctor blade or the like. It is important only that takes place, the application of the second layer while the first layer is still wet enough so that there will be a partial mixing of the layers. In addition, 17 of course still further coating stations may be provided after the second coating station to apply, for example, a third liquid coating means onto the still wet second coating means 21, or additional stations to introduce abrasion resistant particles on or in the wet layers.

After leaving the coating station 17, the coated sheets are transported to a curing station 30 10, where the layers are cured by means of UV lamps 31st On their way from the coating station 17 to the cure station 30 there will be a partial mixing of the liquid coating means 20 and 21, which takes place at the interfaces of the two coating compositions in particular. The mixing is naturally greater, the closer one is located at the interface of the two layers. By the hardening of the layers in the curing station 30 of the mixing process is stopped and fixed once set, the mixing ratio and thus the mechanical properties of the coating produced. The extent of the mixing at the boundary surfaces - which takes place by itself and preferably without external mechanical impact - this depends on the amount of time that elapses between the application of the second coating agent 21 on the still wet first coating means 20 and the curing in the curing station 30 , In addition, the mixing of the two coating compositions is also influenced by the respective viscosity of the coating agent, wherein a rule of thumb, the viscosity is higher, the smaller the mixing per unit time.

The principle of mixing of the two applied coating agent is best seen from the schematic illustration of FIG. 2A to 2C. Fig. 2A shows the state of the two applied to a wood material board 10 coating means 20 and 21 immediately after application of the second coating agent 21. At this time, has practically not yet occurred mixing. The coating means 20 and 21 are in this case polymers, each having different numbers of CC carbon double bonds. As indicated schematically in Fig. 2A, thereby, the first coating agent 20 a smaller number of CC double bonds, as the second coating agent 21. Due to the larger number of CC double bonds in the coating agent 21, this having after curing a greater hardness than the coating agent 20, which is provided with fewer CC double bonds.

Since the two coating compositions are wet-on-wet applied 20 and 21, it comes from the interface 22 between the two layers to a mixture thereof, as is indicated in Fig. 2B. This means that in the border area to the boundary layer 22 by the mixing process in the underlying layer more double bonds are present, and accordingly in the border area of ​​the overlying layer slightly less double bonds, such as prior to mixing. Fig. 2C shows the two

Layers after the mixing is more advanced a little and has reached an appropriate degree of mixing. At this time, the curing of the coating means, for example by means of UV-radiation is carried out, this degree of mixing is defined as in the cured layers no more mixing can take place naturally. In the diagram of Fig. 3, the hardness profile of a coating (example with hardness gradient) according to the invention and a coating applied according to the prior art. The example of the invention consisted of a polished, and provided with a primer derived timber board, were applied wet-on-wet on the two different coating compositions. The first applied coating agent consisted of about 35% 1, 6- hexanediol diacrylate and about 65% polyester and was coated at 45 g / m. The second coating agent was applied onto the still moist first layer consisted of about 70% polyurethane acrylic acid ester and 30% dipropylene glycol and was coated at 40 g / m 2. After the application of the second layer 10 seconds were maintained to give the viscous liquid materials the opportunity to mix. Subsequently, the two layers were co-cured completely.

The example of the prior art consisted of a conventional coating, in which several thin layers of material were applied individually and in which the previously coated layer was cured between the respective order operations. The lower 3 layers consisted of a mixture of 70% polyester and 30% 1, 6- hexanediol diacrylate with an application thickness of each 12 g / m 2. The two upper layers consisted of 70% and 30% Polyurethanglycoldiacrylat Dipropylenacrylsäureester and the two upper layers contained 15% aluminum oxide with an average particle size of D 50 of 25 microns.

The test was carried out under the European standard for laminate flooring DIN EN 13329 with a Taber Abraser tester 5151 the company Taber Industries. In each case after 200 revolutions with S-41 abrasive paper, the hardness and the groove depth of the samples were determined. The determination of the Martens hardness (registering hardness test under Prüfkrafteinwirkung) was conducted in accordance with DIN EN ISO 14,577th As a tester, a "Fischer Scope H100" of Helmut Fischer GmbH was used following test parameters were used:. Maximal strength: 50/30 mN and measurement time: 20 seconds The determination of trace depth was carried out with a mechanical Tastschnittmessgerät a perthometer S3P was as a tester of the company.. Perthen used.

When measuring the samples has shown that it is likely to come to more or less large deviations in the hardness of a given layer depth due to the use relatively soft materials. It is therefore necessary to measure at several points to meaningful than an averaging, to obtain representative data. In the measurements taken, the hardness as well as the groove depth after 200 rotations of the abrasive paper were measured at four points. It has been shown that four measurement points in most cases provide sufficient accuracy. Of course, you can still get accurate measurement results when using more than four data points, such as eight.

In the table given below the individual readings for the inventive sample of Example are shown. The measurement was made at the final cured coating, ie, the state would also be used in such products as a real floor panels.

Figure imgf000015_0001

Table 1: Example with hardness gradient

In the above given table, the "rotation" column indicates the number of revolutions, the abraser with the Taber tester were conducted. The "depth track" column indicates how much microns material of the coating starting from the original surface at the four measurement points 1 were removed. 4 The "depth of hardness measurement" column indicates how much micrometers the test mandrel at the four measurement points 1-4, respectively penetrated the coating. Is then in the column "Martens hardness" in each case, the hardness in Newton per mm 2 for the four measurement points 1 -4 specified. Below the individual values ​​of the respective mean value of the four measurement points indicated. From the above given table can be well seen that the Martens hardness decreases, the deeper one penetrates into the cured, finished layer. It is also noted that at 800 and 1000 (total) turns a slight increase in Martens hardness is recorded. This is attributed to an irregular mixing of the two coating agents used, which is in practice difficult to completely avoid. from the graph of FIG. 3 Nonetheless, it can be seen clearly, the total is present in the example with a hardness gradient almost continuous drop in hardness without great leaps. The comparative example of the prior art does not show such continuous course of the hardness but rather has at a depth of 60 to 80 .mu.m a pronounced discontinuity to the original initial hardness.

The mean values ​​of the test piece according to the invention are shown in Table 2 below.

Figure imgf000016_0001

Table 2: Mean values ​​of the example with hardness gradient

The values ​​of the Vergleichsprüfkörpers according to the prior art are shown in the below Tables 3 and 4. FIG.

Figure imgf000017_0001

Table 3: sample of the prior art

Figure imgf000017_0002

Table 4: Mean values ​​of the sample according to the prior art has been found experimentally that particularly good mechanical properties of the final total layer can be obtained when the hardness gradient of the final total layer - as is exemplified in Figure 3 - essentially following relationship corresponds to:

(-3.0 • x) + C ≤ Y (x) ≤ (0.2 • x) + C wherein: each of the absolute value of the depth in microns of the coating of the

Surface of the coating is seen here; Y (x), the absolute value of the hardness in N / mm 2 at a certain

Depth x; and

C is the absolute value of the initial hardness in N / mm 2 of the coating at about x ~ 0-5 microns deep.

Among the "absolute" - values is to be understood that only the pure numerical values in the above formula is entered, that is, without the associated unit of measurement "micron" or "N / mm 2" For example, if the initial value of the above example with hardness gradient 140th , N / mm 2 is 8 (see Table 2), so in the above table, only the absolute values, that is, C = 140.8 may be used. Similarly, only the absolute values, that is, for example, x = 3.5 are used for x. This results then, for example, upper and lower limits for Y (x = 3.5) of 140.1 or 130.3. At a depth of x = 40 microns is obtained, for example, for the upper limit 132.8 and 20.8 for the lower limit. These upper and lower limits for Y (x) have the unit N / mm 2. It is important that the absolute values are used starting from the designated units "microns" or "N / mm 2" in the formula and not Ex. from "mm" or "N / m 2". It should be clear to the skilled person that the above formula k is but a mathematical formula to describe the hardness gradient itself rather defines an area in which it is to run.

The initial value of the hardness of the coating is the value in the first few microns of the coating. Due to the commonly used measuring method by means of a plug gauge, which penetrates a few microns in the coating, it is difficult to determine the hardness of the depth of penetration "0 microns." The phrase "substantially" is therefore chosen because it is difficult to perfectly uniform mixing to reach the materials so that there can be individual small outliers in real time and again, such as the hardness value of 104.2 Newtons / mm 2 at a depth of 42.1 microns (see Table 2) of the above-discussed example with hardness gradient. Moreover, the values ​​are extremely close inaccurate on the surface of the wood panel usually because the residual layer thickness to be measured must have a certain minimum thickness in order to allow for meaningful measurements. The residual layer thickness should be at least 5 microns, preferably 10 microns, and even more preferably at least 20 microns for meaningful measurements therefore. In other words, the last 20 microns of the layer near the wood-based panel, do not necessarily follow the above-referenced preferred hardness gradient, although this is of course preferred.

In a further preferred embodiment the hardness gradient substantially the following relationship follows:

(-2.5 x) + C ≤ Y (x) ≤ (-0,4- x) + C

And in a further preferred embodiment, substantially:

(-2.0 • x) + C ≤ Y (x) ≤ (0.6 • x) + C

In Figures 4 to 6 show the importance of the relationship referred to above, the hardness gradient is illustrated using the example with hardness gradient. It should be clear that the indicated absolute values ​​for hardness and depth are merely exemplary. Of course it is also possible to apply all layers with significantly greater thicknesses or lower thicknesses. In addition, the absolute value of the hardness of course, depends on the materials used and can also be larger or smaller than the values ​​of the example with hardness gradient. However, the magnitude of the values ​​given for the example with hardness gradient for use in a floor panel is particularly preferred and suitable.

The skilled artisan will appreciate by the detailed description of the inventive method as it can achieve a coating of the invention a wood material board. This means of course that all the materials referred to or in connection with the description of the method mentioned, for example, the substances for the coating agent in the inventive coating of the wood material board can be used.

The presented method is especially suitable for coating of floor panels, or for the coating of wood-based panels which are further processed to floor panels, since here the advantageous mechanical properties of hardness gradient greatest impact. Similarly, the presented coated wood particle board is the same reason, preferably a floor panel, or a coated wood particle board, which is provided for further processing into a floor panel.

Claims

claims
1. Coated Holzwerkstofφlatte, in particular a wall, ceiling or floor panel, comprising a front and a back, wherein at least the surface of the front side is provided with a polymer coating, characterized in that the polymer coating has a hardness gradient, so that the hardness of the polymer layer seen with increasing depth from the surface of the coating forth substantially continuously decreases.
2. A coated wood-based panel according to claim 1, characterized in that the hardness gradient substantially corresponds to the following relationship: (-3.0 - JC) + C <7 (JC) <(-0.2 - JC) + C wherein: each of the absolute value of the depth in microns of the coating of the
Surface of the coating is seen here; Y (x) is the absolute value of the hardness in N / mm 2 at a predetermined depth x; and
C is the absolute value of the initial hardness in N / mm 2 of the coating at about x ~ 0-5 microns deep.
3. Coated Holzwerkstofφlatte according to claim 1, characterized in that the hardness gradient substantially following
Relationship corresponds:
(-2.5 • x) + C <F (Jt) <(-0.4 x) + C wherein: each of the absolute value of the depth is seen in microns of the coating from the surface of the coating forth;
Y (x), the absolute value of the hardness in N / mm 2 at a certain depth is depending; and C is the absolute value of the initial hardness in N / mm 2 of the coating at about JC ~ 0-5 microns depth ..
4. A coated wood-based panel according to claim 1, characterized in that the hardness gradient substantially following
Relationship corresponds:
(-2.0 • x) + C ≤ Y (x) ≤ (-0.6 x) + C where:
JC the absolute value of the depth is seen in microns of the coating from the surface of the coating forth;
Y (x), the absolute value of the hardness in N / mm 2 at a certain
Depth x; and
C is the absolute value of the initial hardness in N / mm 2 of the coating at about x ~ 0-5 microns deep.
5. A coated wood-based panel according to any one of the preceding claims, characterized in that the flap is a particle board, MDF board, HDF board, OSB board or real wood board.
6. A coated wood-based panel according to any one of the preceding claims, characterized in that the polymer coating consists of more polymeric, which are curable by radiation.
7. A coated wood-based panel according to any one of the preceding claims, characterized in that the polymer coating has an initial Martens hardness at a depth of approximately 0-5 microns from 120 N / mm 2 to 250 N / mm 2 measured according to DIN ISO 14,577th
8. A coated wood-based panel according to any one of the preceding claims, characterized in that the polymer coating 2 to 200 N / mm 2 measured according to DIN ISO 14577 has an initial Martens hardness at a depth of approximately 0-5 microns from 130 N / mm.
9. A method for coating a wood material board, comprising the steps of: a) providing a wood material board; b) applying a first liquid coating means; c) applying at least a second liquid coating composition to the still wet first coating means, so that there will be a partial mixing of the coating compositions; d) curing of the applied coating means by means of radiation, so that the cured resultant coating has a hardness gradient wherein the hardness of the coating decreases with increasing depth viewed from the surface of the resulting coating forth.
10. A method for coating a wood material board according to claim 9, characterized in that further coatings are applied to the still wet previously applied coating agent prior to step d).
11. A method for coating a wood material board according to claim 9 or 10, characterized in that the hardness gradient substantially corresponds to the following relationship:
(-3.0 • x) + C ≤ Y (x) ≤ (0.2 • x) + C wherein: each of the absolute value of the depth in microns of the coating of the
Surface of the coating is seen here;
Y (x), the absolute value of the hardness in N / mm 2 at a certain
Depth x; and
C is the absolute value of the initial hardness in N / mm 2 of the coating at about x ~ 0-5 microns deep.
12. A method for coating a wood material board according to claim 9 or 10, characterized in that the hardness gradient substantially corresponds to the following relationship: (-2.5 x) + C ≤ Y (x) ≤ (-0,4- x) + C wherein: Λ: the absolute value of the depth in microns of the coating of the
Surface of the coating is seen here; Y (x) is the absolute value of the hardness in N / mm 2 at a certain depth x; and
C is the absolute value of the initial hardness in N / mm 2 of the coating at about x ~ 0-5 microns deep.
13. A method for coating a wood material board according to claim 9 or 10, characterized in that the hardness gradient substantially corresponds to the following relationship:
(-2.0 ■ x) + C ≤ Y (x) ≤ (-0.6 x) + C wherein: each of the absolute value of the depth is seen in microns of the coating from the surface of the coating forth;
Y (x), the absolute value of the hardness in N / mm 2 at a certain
Depth x; and
C is the absolute value of the initial hardness in N / mm 2 of the coating at about x ~ 0-5 microns deep.
14. A method for coating a wood material board according to one of claims 9 to 13, characterized in that the first and second layers are polymer layers, wherein the second polymer layer is more CC double bonds than the first polymer layer.
15. wood material plate coated by a method according to any one of claims 9 to 14th
16. Use of a coated wood particle board according to claim 1 or 15 as a floor, ceiling or wall panel.
PCT/EP2007/010215 2005-11-24 2007-11-23 Coated board of wood-based material WO2008061791A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EPPCT/EP2006/011246 2006-11-23
PCT/EP2006/011246 WO2007059967A1 (en) 2005-11-24 2006-11-23 Coating device comprising a flowing coating material

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
AT07856247T AT498459T (en) 2006-11-23 2007-11-23 Coated wooden material plate
DE200750006518 DE502007006518D1 (en) 2006-11-23 2007-11-23 Coated wooden material plate
EP20070856247 EP2094396B1 (en) 2006-11-23 2007-11-23 Coated board of wood-based material
MX2009005425A MX2009005425A (en) 2005-11-24 2007-11-23 Coated board of wood-based material.
US12516069 US20100098963A1 (en) 2005-11-24 2007-11-23 Coated board of wood-based material
US13616070 US8865267B2 (en) 2005-11-24 2012-09-14 Coated board of wood-based material and a method of producing same
US14976436 US20160129473A1 (en) 2005-11-24 2015-12-21 Coated board of wood-based material

Related Child Applications (4)

Application Number Title Priority Date Filing Date
US12516069 A-371-Of-International
US12516069 A-371-Of-International 2009-12-14
US13616070 Division US8865267B2 (en) 2005-11-24 2012-09-14 Coated board of wood-based material and a method of producing same
US14976436 Continuation US20160129473A1 (en) 2005-11-24 2015-12-21 Coated board of wood-based material

Publications (1)

Publication Number Publication Date
WO2008061791A1 true true WO2008061791A1 (en) 2008-05-29

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Family Applications (2)

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PCT/EP2007/010150 WO2008061765A1 (en) 2005-11-24 2007-11-22 Method for printing directly onto boards of wood-based material
PCT/EP2007/010215 WO2008061791A1 (en) 2005-11-24 2007-11-23 Coated board of wood-based material

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PCT/EP2007/010150 WO2008061765A1 (en) 2005-11-24 2007-11-22 Method for printing directly onto boards of wood-based material

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EP (3) EP2121198B1 (en)
DE (1) DE502007006518D1 (en)
ES (1) ES2384699T3 (en)
WO (2) WO2008061765A1 (en)

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Also Published As

Publication number Publication date Type
EP2314381A1 (en) 2011-04-27 application
EP2121198B1 (en) 2011-08-31 grant
ES2384699T3 (en) 2012-07-11 grant
EP2121198A1 (en) 2009-11-25 application
EP2094396A1 (en) 2009-09-02 application
EP2094396B1 (en) 2011-02-16 grant
DE502007006518D1 (en) 2011-03-31 grant
WO2008061765A1 (en) 2008-05-29 application
EP2314381B1 (en) 2012-03-21 grant

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