KR100679725B1 - Wood panel and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a wood panel including a coating layer comprising a nano-inorganic filler and excellent surface resistance to scratches and resistance to crushing by increasing the surface hardness, and a method for manufacturing the plywood and the surface of the plywood In a wood panel comprising a veneer and a surface coating layer coated on the surface of the veneer to protect the surface, the nano-inorganic fillers 3 to 5% by weight of the nano-inorganic filler nanoparticles of the surface coating layer is contained in the conventional UV curing resin It is characterized in that the surface is made by curing after coating the coating.

Wood, plywood, montmorillonite, surface coating, inorganic filler, lipophilic nanoparticles

Description

Wood panel and manufacturing method thereof

The present invention relates to a wood panel and a method of manufacturing the same. More particularly, the present invention relates to a wood panel including a coating layer including a nano-inorganic filler and excellent in resistance to scratches and resistance to crushing by increasing surface hardness and a method of manufacturing the same.

Wood panels are used for various purposes, such as flooring of floors, ceilings and boards that form doors. Such wood panels mainly comprise a plywood, a veneer decorating the surface of the plywood and a surface coating layer covering the surface of the veneer to protect the surface.

The development of plywood manufacturing technology improves the utilization of solid wood and provides many plywoods with excellent physical properties.However, in processing wood, plywood is not cut directly from the solid wood or boards, but the wood is rounded and cut like this. Thinly formed wood thin plates are laminated by a method such that the grains are disposed in a vertical direction with respect to each other, and bonded to each other with an adhesive or the like to be molded into a plate-shaped body having a constant thickness. By doing so, the plywood does not have a constant grain direction compared to the wood plate having a grain, there is almost no warpage and the like, so that deformation does not occur, and the endurance and the like are improved in all directions. However, the plywood processed by this method has a disadvantage in that the decorative property is remarkably inferior because there is no so-called 'wood grain' pattern because of its processing characteristics.

Therefore, when using such plywood for flooring or other building materials such as flooring, it is again decorated with a veneer, etc., and the surface is coated with a resin coating material to impart water resistance and scratch resistance.

In order to use for the floor floor, generally used wood panels were mostly used by applying a resin such as melamine on one side of the plywood and glued veneer to it. However, the wood panel as described above uses only a chemical adhesive, melamine, etc. in bonding the lower board and veneer, so there is a problem that the adhesive strength is lowered and the veneer falls from the plywood during use, and there is a disadvantage of smelling chemicals. There was this.

Korean Patent Publication No. 10-389068 discloses a 'wood panel', in which a veneer having a thickness of 1 mm or less is adhered to one side of a plywood having a thickness of 7 to 8 mm with an adhesive that emits far infrared rays 4 Each panel is formed, and a UV coating layer is formed on the upper surface of the veneer of the four-side panel to form a UV coating layer. Two sides of the four-panel panel are provided with fitting grooves having a predetermined depth, and the remaining two of the four-side panels on which the fitting grooves are formed. The side of the plywood is formed and the wood panel is formed by forming an air hole at a predetermined interval on the bottom of the plywood, but the UV coating layer is formed thinner has a disadvantage of low resistance to scratching and resistance to pressing. This is believed to be due to the fact that a product having excellent surface hardness cannot be obtained because the thickness of the coating layer is limited by the conventional coating method.

Republic of Korea Utility Model Registration No. 20-293422 describes 'reinforced floorboards that express the pattern with natural veneer,' where the melamine sheet is bonded to both sides of the natural veneer to form a patterned plate and then bonded to the plywood In order to be suitable for use as floorboards, cutting grooves are cut to a certain size so that coupling grooves are formed on one side and coupling protrusions are coupled to the other side. It describes reinforced floorboards to achieve the visual effects used. However, this also has the disadvantage that the resistance to scratching and resistance to depression is low.

In addition, a surface-reinforced floorboard material having flame retardancy by impregnating a phenol resin containing a flame retardant additive and a melamine resin containing a flame retardant additive is described in Korean Utility Model Registration No. 20-350424.

In addition, although far-infrared radiation antibacterial ondol wood floorboards are described in Korean Patent Laid-Open Publication No. 1998-83689, the inorganic fillers used here are generally high in far infrared radiation efficiency such as aluminum oxide, silicon oxide, iron oxide, zirconium oxide, and the like. Known metal oxides are used, which have far-infrared radiation effects, but do not provide a surface hardening effect as described herein.

In addition to the conventional plywood floor, as mentioned above, the veneer is adhered to the plywood, then colored and coated by a roll coater (roll coater) is made, and the synthetic resin as a pressure-sensitive main tube on the veneer for surface hardness reinforcement Injecting method is used, but in the case of coloring is performed by the roll coater has the disadvantage that the wood (pattern) that has the advantage of veneer can not be saved as it is. This is because the eyes of wood tend to disappear by the coloring paint. In addition, for the surface hardness, surface scratches, wear resistance and durability, paints such as urethane, epoxy and acrylic-based paints as a thick coating, which has a problem of being easily broken due to its high strength, rather than flexibility.

In addition, there are several developed technologies for surface strength reinforcement. For example, WPC method (Wood polymer composite) increases the strength and hardness by resin impregnating wood veneer (pattern), and then paints the coats of the middle, middle and top coats. It is consisted of finishing with a wood veneer, and the resin is pressed into the pores and cell layers of wood without forcing the wood veneer onto the plywood. There existed a problem that defects, such as a split of a single plate (cracking in the grain direction) generate | occur | produce. In contrast, the melamine resin impregnation and overlay press method is to cover the top of the veneer with an overlay containing the veneer and aluminum oxide (Al ₂ O ₃ ) impregnated in the melamine resin when the veneer on the plywood is attached to a high-temperature, high-pressure press It is a method that penetrates inside the veneer, which is similar to the reinforced floor, and it is also economically deteriorated due to expensive equipment and cumbersome work methods, and it is difficult to obtain the surface texture of the thin coating method on the veneer desired by consumers. have.

Also in the coloring method using a roll coater, an aqueous coloring method, an oil coloring method, a dyed veneer method, etc. have been developed and used. The aqueous coloring method is a method of mixing an inorganic dye colored in a specific recipe with a filler to make an appropriate viscosity by mixing water or alcohol to facilitate the operation, and then directly coloring the substrate using a sponge roll or the like. A separate wiping process that removes the dye (stone) from the substrate is required for proper coating amount and proper color, and a separate hot air drying device or time for natural drying is needed for drying, and various colors can be realized. In order to go through the cumbersome process of washing the device (roll coater, etc.) every time the color of the dye (paint) changes, and because of the method of painting on the surface of the veneer due to the nature of the coloring method, it is necessary to take the cover of the wood grain. There are disadvantages such as appearing as an artificial product if it goes over. The oil-based coloring method mixes the inorganic dyes colored at a specific compounding ratio with the paint, mixes thinners (may not be mixed) to facilitate back-up, makes an appropriate viscosity, and then directly sprays onto the substrate by using a sponge roll or rubber roll spray method. It is a way of coloring. In order to realize proper coating amount and proper color, a separate wiping process is required to scrape dyes (paints) .A separate UV drying device or hot air drying device is required for drying. Whenever the color of the paint changes, it has to go through the cumbersome process of washing the device (roll coater, etc.), and due to the nature of the coloring method, it is a method of painting the surface of the veneer. There are disadvantages such as the appearance of artificial products. In addition, the dyeing veneer method removes the color of the veneer with a specific bleaching agent, and penetrates or processes the veneer in the dyeing solution that produced the color at a specific compounding ratio to create a color throughout the veneer. It is not suitable for mass production, and it is necessary to go through the process of bleaching and dyeing twice for one veneer, and the use of chemicals during the bleaching process may affect the environment and the human body.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wood panel and a method of manufacturing the same, which include a coating layer including a nano-filled inorganic filler, thereby increasing the surface hardness and resistance to scratching and resistance to crushing.

The wood panel according to the present invention comprises a plywood, a veneer for decorating the surface of the plywood and a surface coating layer coated on the surface of the veneer to protect the surface, wherein the surface coating layer is nano-inorganic filler 3 to 5% by weight of the remaining amount is made by curing after the surface coating of the nano-coating paint, which is contained in a conventional ultraviolet curing resin.

The nano-filled inorganic filler of the nano-coating paint may be a hydrophilic montmorillonite particle having a length of 10 nm to 10 μm and a thickness of 10 nm to 10 μm or a lipophilic montmorillonite obtained by treating the montmorillonite particle with alkylammonium. .

The surface coating layer is a low-viscosity UV curable coating of 0.8 to 1.2 poise (poise) in the amount of 40 to 60g / ㎡ coated on the undercoat layer, and the UV-curing paint on the undercoat layer 40 to 60g / ㎡ It comprises a middle layer formed by coating in an amount of and a top layer made by coating in an amount of 25 to 35g / ㎡ on the middle layer with the nano-coating paint.

In addition, the method of manufacturing a wood panel according to the present invention, in the manufacture of a wood panel comprising a plywood, a veneer decorating the surface of the plywood and a surface coating layer coated on the surface of the veneer to protect the surface, ( 1) a core forming step of forming a plywood core by laminating a plurality of plywood; (2) a veneer adhesive step of laminating and adhering veneer on the plywood core obtained in the core forming step; (3) a coloring step of transferring a color film printed with a coloring dye onto the veneer of the plywood core on which the veneer obtained in the veneer bonding step is laminated to the veneer in a hot press; (4) after the coloring step, a low-viscosity coating step of coating a cured low-viscosity UV curing paint of 0.8 to 1.2 poise (poise) in an amount of 40 to 60g / ㎡, and curing; (5) after the undercoating step, a middle coating step of coating and curing in an amount of 40 to 60g / ㎡ on the undercoat layer with a low-viscosity UV curing paint of 0.8 to 1.2 poise (poise); And (6) after the intermediate coating step, 3 to 5% by weight of the nano-inorganic filler is coated in an amount of 25 to 35 g / ㎡ on the intermediate layer with a nano-coating paint, which is contained in a conventional ultraviolet curing resin as the remaining amount It comprises a top coating step to cure;

Hereinafter, the present invention will be described in detail with reference to specific examples.

The wood panel according to the present invention comprises a plywood, a veneer for decorating the surface of the plywood and a surface coating layer coated on the surface of the veneer to protect the surface, wherein the surface coating layer is nano-inorganic filler It is characterized in that 3 to 5% by weight is made by curing after the surface coating of the nano-coating paint, which is contained in the usual ultraviolet curing resin as the remaining amount. The wood panel comprising a plywood, a veneer decorating the surface of the plywood and a surface coating layer coated on the surface of the veneer to protect the surface is already known enough to be commercially available at home and abroad. It can be. The plywood and veneer constituting the wood panel in the above is already known, it can be understood that those skilled in the art can be known and commercially available from leading manufacturers at home and abroad. In particular, in the present invention, as a plywood core, one formed by laminating about 5 to 9 sheets of ordinary plywood can be used. In addition, the veneer is a common veneer, which functions to form a decorative effect, that is, a grain of wood, etc. to beautify the appearance of the wood panel. The pattern of the veneer is teak wood (rose wood), rose wood (Anigre), oak tree (oak tree), beech (birch), etc. Those having the shape of wood grains can be used. The present invention is characterized in that the surface coating layer is made by curing after the surface coating of the nano-coating paint, which is composed of 3 to 5% by weight of the inorganic filler nanonized as a residual amount in a conventional UV curing resin. The nano-mineralized inorganic filler as a constituent of the nano-coating paint may be a lipophilic montmorillonite obtained by treating montmorillonite particles having a length of 10 nm to 10 μm and a thickness of 10 nm to 10 μm with alkylammonium. In the above montmorillonite is a kind of clay (natural) can be used to collect naturally. Particularly, the lipophilic montmorillonite has been described in Korean Laid-Open Patent Publication No. 2002-10560, and physically pulverized to have a length of 10 nm to 10 μm and a thickness of 10 nm to 10 μm. In order to increase the compatibility of cations such as sodium ions (Na ⁺ ) present in the interlaminar gallery of montmorillonite particles with an alkylammonium, it becomes lipophilic montmorillonite by ion exchange reaction. This can be used to purchase from Nanotech Co., Ltd. in South Korea. In addition, the other ultraviolet curable resin, which is another component described above, is a resin cured by ultraviolet rays, and is mainly composed of a modified acrylic resin as a substrate. Such ultraviolet curable resins are commonly used by leading domestic and foreign manufacturers. It can be understood that it is well known enough to purchase and use the provided (for example, UB-700 of UB Plus, Inc.). When the nano-coated paint is included in the nano-filled inorganic filler in less than 3% by weight, there is a problem that the surface hardness of the coating film is too low because the content of the inorganic filler is too low, on the contrary when it exceeds 5% by weight On the contrary, there may be a problem that the paint film itself is not formed well. Nano-coated paint as described above may preferably have a low viscosity of 0.8 to 1.2 poise (poise). At this time, the main factor for determining the viscosity of the nano-coating paint may be determined by the particle size and physical properties of the inorganic filler and the content of the solvent in the UV-curing paint, in the present invention, particularly as described above, It is characterized in that the surface coating film can be formed sufficiently thick by using montmorillonite to lower the viscosity.

The surface coating layer is a low-viscosity UV-curing coating of 0.8 to 1.2 poise (poise) 40 to 60g / ㎡ coated with an amount of 40 to 60g / ㎡, and the low-viscosity UV-curing paint 40 to 40 on the undercoat It comprises a middle layer formed by coating in an amount of 60g / ㎡ and a top layer made by coating in an amount of 25 to 35g / ㎡ on the middle layer with the nano-coating paint. When the viscosity of the UV-curing paint is less than 0.8 poise, the viscosity is too low to increase the flowability, it is difficult to form a suitable film thickness, on the contrary, even if it exceeds 1.2 poise, a homogeneous coating film is not formed, it is a product that is commercial There may be a problem that is difficult to obtain. Particularly, in the present invention, as described above, the entire surface coating layer is formed to a thickness of 105 to 155 g / m 2, thereby forming a surface coating layer thicker than that of a conventional product formed to a thickness of 45 to 60 g / m 2, thereby making the surface hardness especially. It is characterized by an enhanced point.

In particular, the undercoat layer may allow about 40% of the coating amount to penetrate the veneer. This is applied to the low-viscosity UV curable resin to form the undercoat layer, and heat-dried to increase the temperature of the substrate (plywood bonded with veneer) at room temperature to increase the temperature of pores and decrease the viscosity of the UV curable resin. It is achieved by increasing the permeability into and then curing the gallium light source and ultraviolet light source. The formation of the intermediate layer may be the same as or similar to the formation of the lower layer. At this time, since the intermediate layer is formed on the undercoat, UV curing resin does not penetrate into the veneer under the undercoat when the intermediate layer is formed. The formation of the intermediate layer may particularly preferably consist of three to four coatings using at least two or more plurality of roll coaters, which functions in particular as a thickening of the coating. In addition, the formation of the top coat layer is the same as or similar to the above-described conventional UV curing paint, except that the UV curable resin includes nanoorganized lipophilic montmorillonite as described above. It may be the same or similar to formation. In particular, the top coat layer includes the nanonized lipophilic montmorillonite as described above, which functions as an inorganic filler, and in particular, increases the surface hardness of the top coat layer. The top coat containing the nanonized lipophilic montmorillonite as the inorganic filler may improve the resistance to surface scratching and hardening, durability, weather resistance, etc. by curing, and at the same time, it may be expected to emit far infrared rays and anion.

In addition, the method of manufacturing a wood panel according to the present invention, in the manufacture of a wood panel comprising a plywood, a veneer decorating the surface of the plywood and a surface coating layer coated on the surface of the veneer to protect the surface, ( 1) a core forming step of forming a plywood core by laminating a plurality of plywood; (2) a veneer adhesive step of laminating and adhering veneer on the plywood core obtained in the core forming step; (3) a coloring step of transferring a color film printed with a coloring dye onto the veneer of the plywood core on which the veneer obtained in the veneer bonding step is laminated to the veneer in a hot press; (4) After the coloring step, the low viscosity nano-coating paint of 0.8 to 1.2 poise (40) by which 3 to 5% by weight of the inorganic filler nanonized on the veneer is contained in the conventional UV-curing resin as the remaining amount. A coating step of coating in an amount of from 60 g / m 2 and curing; (5) after the undercoat coating step, the coating method in the amount of 40 to 60g / ㎡ on the undercoat layer with the nano-coating paint, and curing the intermediate coating step; And (6) after the intermediate coating step, the coating layer in the amount of 25 to 35g / ㎡ on the intermediate layer with the nano-coating paint, and the top coating step to cure;

The core forming step of (1) is a step of forming a plywood core by laminating a plurality of plywood, thereby preparing a plywood core, the plywood core forms a substantial thickness of the wood panel, the feel of wood Will be provided. The veneer bonding step of (2) consists of laminating and adhering ordinary veneer on the plywood core obtained in the core forming step, eliminating the monotony of the plywood, and expressing the wood grain of the veneer itself to give a beautiful appearance. To be provided. The coloring step of (3) consists of transferring the color film printed with coloring dye onto the veneer of the plywood core on which the veneer obtained in the veneer bonding step is laminated, and transferring the colored film to the veneer in a high-temperature press. Make sure to show a distinctive color, such as rose or cherry tree. In particular, in the present invention by using a so-called 'oil-based sublimation transfer method' that transfers the color film printed on the veneer of the plywood core to the veneer in a high-temperature press to color the pattern such as the wood grain of the veneer while maintaining It can express the color of. The above-mentioned meteor sublimation transcription method is known to those skilled in the art and may be referred to, for example, those disclosed in Korean Patent Laid-Open Publication No. 2002-26211. In the above publication, the coating of industrial oil-based sublimation transfer ink on the polyethylene terephthalate film with a thickness of about 12 μm is brought into close contact with the adherend, followed by heating so that the ink on the film is transferred to the surface of the adherend. Herein, the above-mentioned oil-based sublimation transfer ink may include 1 to 3 parts by weight of polyethylene vinylbenzene (PVB) resin, methyl ethyl ketone (MEK), dimethylformamide (DMF), methanol and / or ethanol for preparing an industrial oil-based sublimation transfer ink. It is prepared by mixing 60 to 80% by weight of the mixed solution of 20 to 60 parts by weight and 20 to 40% by weight of the dairy acid intermediate. The coloring of the oil-based sublimation transfer method using the oil-based sublimation transfer film is a separate process by overlaying the oil-based sublimation transfer film colored at a specific compounding ratio on the substrate, and then transferring the substrate to the substrate within a short time by applying a high temperature and a specific pressure. High-pressure pressing without the use of common presses and roll presses can achieve the desired color. Due to the characteristics that the overall pressurization and small particles of dye are sublimed and adhered to the surface of the adherend, that is, the surface of the veneer, they penetrate to the inside of a certain depth of the wood, that is, the veneer, and solve the problem of the concealment of the conventional coloring method. The color penetrates even the small pattern on the surface, allowing for natural coloring that can be seen as a completely different species. In the bottom coating step of (4), after the coloring step, the low viscosity of 0.8 to 1.2 poise (poise) is made of 3 to 5% by weight of the nano-filled inorganic filler on the veneer as a residual amount contained in a conventional ultraviolet curing resin The coating of the nano-coating paint in an amount of 40 to 60g / ㎡, and curing, and the intermediate coating step of (5) is 40 to 60g on the undercoat layer with the nano-coating paint after the bottom coating step It consists of coating in an amount of / ㎡, and curing, the top coating step of (6) is the coating step in the amount of 25 to 35g / ㎡ on the intermediate layer with the nano-coating paint, after the intermediate coating step, The surface coating layer of 105 to 155 g / ㎡ in total is formed by these undercoat, intermediate and top coat, and especially the top coat contains nano-filled inorganic filler It can be further enhanced surface hardness of the outermost surface of the tingcheung.

Hereinafter, preferred embodiments and comparative examples of the present invention will be described.

The following examples are intended to illustrate the invention and should not be understood as limiting the scope of the invention.

Example 1

0.5% by weight of hydrophilic montmorillonite was mixed with acrylic resin as a residual amount, and UV cured at room temperature to produce a specimen (type I), and a tensile test was conducted according to ASTM D638. The cross head speed was measured at a speed of 5 mm / min, and the tensile strength was 870 kg / cm 2 as a result of measuring mechanical properties. In addition, the hardness test according to ASTM D-785 showed that the hardness (Rockwell M) was 92. These results are summarized in Table 1 below.

Example 2

The hydrophilic montmorillonite was carried out in the same manner as in Example 1, except that 1% by weight of the montmorillonite was mixed with the acrylic resin, and the results are summarized in Table 1 below.

Example 3

The hydrophilic montmorillonite was carried out in the same manner as in Example 1, except that 1.5 wt% of the montmorillonite was mixed with the acrylic resin, and the results are summarized in Table 1 below.

Example 4

The hydrophilic montmorillonite was carried out in the same manner as in Example 1 except for mixing with acrylic resin using 2% by weight, the results are summarized in Table 1 below.

Example 5

The hydrophilic montmorillonite was carried out in the same manner as in Example 1 except that 5% by weight of the acrylic resin was mixed, and the results are summarized in Table 1 below.

Example 6

The hydrophilic montmorillonite was treated with alkylammonium to prepare lipophilic montmorillonite, and the same procedure as in Example 1 was carried out except that 0.5 wt% was mixed with acrylic resin, and the results are shown in Table 1 below. In summary.

Example 7

The lipophilic montmorillonite was carried out in the same manner as in Example 1, except that 1% by weight of the montmorillonite was mixed with the acrylic resin, and the results are summarized in Table 1 below.

Example 8

The lipophilic montmorillonite was carried out in the same manner as in Example 1, except that 1.5 wt% of the montmorillonite was mixed with the acrylic resin, and the results are summarized in Table 1 below.

Example 9

The lipophilic montmorillonite was carried out in the same manner as in Example 1 except for mixing with acrylic resin using 2% by weight, and the results are summarized in Table 1 below.

Example 10

The lipophilic montmorillonite was carried out in the same manner as in Example 1, except that 5 wt% of the montmorillonite was mixed with the acrylic resin, and the results are summarized in Table 1 below.

Comparative example

Except that it does not contain montmorillonite was carried out in the same manner as in Example 1, the results are summarized in Table 1 below.

division Inorganic filler content (%) Tensile Strength (㎏ / ㎠) Hardness (Rockwell M) Example 1 0.5 870 92 Example 2 1.0 930 100 Example 3 1.5 880 102 Example 4 2.0 840 104 Example 5 5.0 810 107 Example 6 0.5 2800 93 Example 7 1.0 3300 102 Example 8 1.5 3950 103 Example 9 2.0 3570 105 Example 10 5.0 2620 107 Comparative example 0 700 88

As a result of the synthesis of the above embodiments, both the hydrophilic and lipophilic montmorillonite have both superior tensile strength and hardness compared to the comparative example, and the lipophilic montmorillonite superior to the hydrophilic montmorillonite has excellent tensile strength and It was confirmed that the hardness is shown.

Therefore, according to the present invention, there is an effect of providing a wood panel excellent in resistance to scratching and resistance to crushing by increasing the surface hardness, including a coating layer including the nano-filled inorganic filler, and a method of manufacturing the same.

Although the present invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical scope of the present invention, and such modifications and modifications are within the scope of the appended claims.

Claims (4)

A wood panel comprising plywood, a veneer decorating the surface of the plywood, and a surface coating layer coated on the surface of the veneer and protecting the surface, the wood panel comprising a bottom coat layer, a middle coat layer, and a top coat layer, wherein the bottom coat layer is 0.8 to 1.2 poises ( Poise) is made by coating in an amount of 40 to 60g / ㎡ with a low-viscosity UV curing paint, the intermediate layer is made by coating in an amount of 40 to 60g / ㎡ with an ultraviolet curing paint on the undercoat layer, The top coat layer is a wooden panel, characterized in that the coating made in the amount of 25 to 35g / ㎡ on the intermediate layer with a nano-coating paint. delete delete A core forming step of forming a plywood core by laminating a plurality of plywood for the manufacture of a wood panel comprising a plywood, a veneer decorating the surface of the plywood and a surface coating layer coated on the surface of the veneer to protect the surface; Pressing the veneer veneer step of laminating and adhering the veneer on the plywood core obtained in the core forming step, and the paper film printed with coloring dye on the veneer of the plywood core on which the veneer obtained in the veneer adhering step is laminated In the method of manufacturing a wood panel is a color step of transferring the color to the veneer in color, the bottom coating step, the intermediate coating step and the top coating step sequentially, the bottom coating step is 0.8 to 1.2 poise (poise) on the veneer The low-viscosity UV curable paint was coated in an amount of 40 to 60 g / m 2 and then cured. The coating step is coated with an amount of 40 to 60 g / ㎡ on the undercoat layer with a low viscosity ultraviolet curing paint of 0.8 to 1.2 poise (poise) and then cured, the top coat step is a nano-coating paint on the intermediate layer Method of producing a wooden panel, characterized in that the coating in the amount of 25 to 35g / ㎡ and then cured.