JP2017013310A - Woody composite material manufacturing method, natural wood decorative panel manufacturing method, and wooden composite material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a wooden composite material formed by bending a natural wood decorative panel and pasting the same on a core material, in which crack does not easily occur at bending and the surface of the wooden composite material is hard, and also to provide a natural wood decorative panel manufacturing method used in manufacturing the wooden composite material, and a wooden composite material.SOLUTION: A wooden composite material manufacturing method includes: applying flexible coating on the front surface side of a natural wood decorative panel and forming a flexible coating film (steps S5, S6); applying hard coating on the upper surface of the flexible coating film and forming the hard coating film having higher film surface hardness after drying than the flexible coating film (step S8); forming bending grooves on the rear surface side of the natural wood decorative panel, at portions where the panel is bent (step S11); bending the natural wood decorative panel along the bending grooves so that the bending grooves face the inner side (step S12); and pasting the rear side of the natural wood decorative panel to a core material (step S13).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for producing a wood-based composite material in which a natural wood decorative board is folded and adhered to a middle core material, a method for producing a natural wood decorative board that is folded and adhered to a middle core material, and natural to the middle core material. The present invention relates to a wood-based composite material to which a wood decorative board is attached.

  Conventionally, various wood-based composite materials have been used as construction materials such as counter boards and stairs, and furniture such as table tops and chests. For example, a wood-based composite material in which a board made of a material such as MDF (medium density fiberboard) or lauan plywood is used as a middle core material, and a natural wood decorative board is attached to the middle core material. The wood-based composite material produced using natural wood veneer made of natural wood has an artificial sheet attached to the surface as a decorative material because the wood grain of the natural wood emerges vividly when the surface is painted. Compared to the composite material, there is an advantage that a high-class feeling can be produced.

  A wood-based composite material using a natural wood decorative board is manufactured, for example, by sticking a thinly sliced veneer on the upper surface and lower surface of the core material, and sticking an edge tape on the side surface of the core material. Can do. However, in the wood-based composite material in which the edge tape is attached to the side surface, the finished product has a problem that the edge (corner portion) is conspicuous and the beauty is impaired.

  Therefore, by applying a bending process to bend the natural wood decorative board and sticking the folded natural wood decorative board so as to cover the corner of the core material, the corner of the core material does not come out. A manufacturing method has been proposed. However, unlike an artificial sheet that can be easily processed, the natural wood decorative board has a problem in that the surface of the corner portion to be bent is broken when it is bent.

  Therefore, for example, Patent Document 1 discloses a method for manufacturing a wood material that can suppress cracking in coating even when bending is performed by applying a soft hot-melt adhesive to a decorative veneer. Disclosure.

JP 2006-289663 A

  However, the wood material manufacturing method disclosed in Patent Document 1 has a problem that the surface is soft and easily damaged because a soft paint (adhesive) is applied to the surface for finishing.

  This invention is made | formed in view of such a situation, On the soft coating film which apply | coated the soft coating material, forming a hard coating film, suppressing the crack of the coating at the time of giving a bending process Another object of the present invention is to provide a method for producing a wood-based composite material capable of increasing the surface hardness.

  Another object of the present invention is to provide a method for producing a natural wood decorative board used for producing the woody composite material of the present invention.

  Still another object of the present invention is to provide a wood-based composite material manufactured by the method for manufacturing a wood-based composite material according to the present invention.

  In order to solve the above problems, the method for producing a wood-based composite material described in the present application is a method for producing a wood-based composite material in which a natural wood decorative plate is folded and attached to a core material, and the natural wood decorative plate Coating a soft paint on one side of a natural wood veneer to form a soft paint film, and a hard paint is applied to the surface of the soft paint film and dried. It is manufactured by performing a process including a hard paint application process for forming a hard paint film having a film surface strength higher than that of the soft paint film, and the natural wood decorative board is bent, so that the one side becomes the front side. It is characterized by performing a bending and sticking step of sticking.

  Further, in the method for producing a wood-based composite material described in the present application, the natural wood decorative plate has a base plate attached to the other surface side of the single plate, and reaches from the base plate side to the middle of the single plate. Manufactured by a process including a groove forming step for forming a bent groove, wherein the folding and sticking step is characterized in that the natural wood decorative board is bent along the bent groove formed in the groove forming step. To do.

  Moreover, the manufacturing method of the wood type composite material described in this application is characterized in that the coating film surface strength after drying of the hard coating film formed by the hard coating application process is H or more in pencil hardness.

  The method for producing a natural wood decorative plate described in the present application is a method for producing a natural wood decorative plate that is bent and stuck to a core material, and a soft paint is applied to one side of a single plate of natural wood, A soft coating application process for forming a soft coating film, and a hard coating application for coating the surface of the soft coating film with a hard coating to form a hard coating film having a higher coating film strength after drying than the soft coating film. And performing the process.

  The wood-based composite material described in the present application includes a core material having corners formed on a plurality of adjacent surfaces, and a natural wood decorative board pasted over a plurality of adjacent surfaces of the core material. The natural wood decorative board comprises: a natural wood veneer, a soft coating film formed on one side of the veneer, and a surface of the soft coating film. A plurality of surfaces adjacent to each other so that one surface side is a front side, the film surface strength is higher than that of the soft coating film, and is bent at a position corresponding to a corner of the center core material. It is characterized by being pasted over.

  The method for producing a wood-based composite material according to the present invention, the method for producing a natural wood decorative board, and the wood-based composite material are applied when a bending process is performed by forming a hard coating film on a soft coating film. While suppressing cracking, it is possible to increase the hardness of the surface.

It is a flowchart which shows an example of each process of the manufacturing method of the wood type composite material of this application description. In the manufacturing method of the wood type composite material of this application description, it is explanatory drawing which shows typically an example of the natural wood decorative board after cutting. In the manufacturing method of the wood type composite material of this application description, it is a schematic perspective view which shows typically an example of a bending sticking process. In the manufacturing method of the wood type composite material of this-application description, it is a schematic perspective view which shows typically an example of the completed wood type composite material.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiment is an example embodying the present invention, and is not intended to limit the technical scope of the present invention.

  The present application discloses a method of manufacturing a wood-based composite material by manufacturing a natural wood decorative board to be attached to a middle core material, and further bending and bonding the manufactured natural wood decorative board to a middle core material. . As the core material, a board made of a material such as MDF (medium density fiberboard) or lauan plywood can be used. In this embodiment, an example using MDF as the core material will be described. The natural wood decorative board refers to a board material in which a veneer using natural wood is designed and pasted to a base board and further coated. In the present embodiment, a veneer obtained by slicing (slicing) natural wood such as cedar, tochi and chestnut into a thickness of about 0.2 to 0.5 mm is used as a single plate, and a veneer using such a veneer (single plate). The example which uses a plywood as a natural wood decorative board is demonstrated. Note that the single plate is not limited to a protruding plate, and a single plate such as a rotary single plate obtained by peeling natural wood with a machine tool such as a rotary race can also be used. The term “woody composite material” as used herein refers to materials such as construction materials and furniture materials using wood. The wood-based composite material manufactured by the manufacturing method described in the present application is used as a construction material such as a counter board, a stair tread, a handrail, and a remodeling material. In addition, the wood-based composite material manufactured by the manufacturing method described in the present application is used as furniture materials such as table tops and chiffons.

<Manufacturing method>
The manufacturing method of a natural wood decorative board and the manufacturing method of the wood type composite material using a natural wood decorative board are demonstrated. FIG. 1 is a flowchart showing an example of each step of the method for producing a woody composite material described in the present application. First, a natural wood decorative board (which may be simply referred to as “decorative board” in the following description) is manufactured. A thin plate-like MDF, veneer plywood, non-combustible material (dielight, etc.) is used as the base plate of the decorative plate, and a sheet material made of paper, non-woven fabric, etc. is applied to the back surface of the base plate by a machine tool such as a laminator. A base plate backing process for backing as a moisture-proof sheet is performed (step S1). For the base plate, a base material having a thickness of about 2 to 10 mm, for example, 3 mm is used. In step S <b> 1, the back surface of the base plate is a surface on the side opposite to the surface (one surface) side that is exposed by painting and indicates a surface (other surface) that is attached to the core material. .

  Next, an adhesive is applied to the surface of the base plate on which the moisture-proof sheet is backed, and a base plate non-woven fabric attaching step for attaching the non-woven fabric is performed (step S2). In step S2, a nonwoven fabric is affixed for the purpose of preventing cracking of the protruding plate.

  Next, a veneer pasting process is performed in which a veneer is pasted onto the surface of the base plate on which the nonwoven fabric is pasted (step S3). In step S3, for example, an adhesive is applied on the nonwoven fabric pasted on the base plate, and a step of sticking the projecting plate to the base plate by a hot melt method under conditions such as 100 ° C. × 60 seconds is performed. The veneer is made of wood such as cedar, tochi, chestnut, etc.

  Next, a polishing process is performed in which the surface of the protruding plate attached to the base plate is polished by a machine tool such as a wide belt sander (step S4). Then, the ground surface of the polished veneer is colored as necessary, and further a hot air of about 80 ° C. is blown to perform a drying process.

  Next, a soft paint application process is performed in which a soft paint is applied to the surface of the polished veneer to form a soft coating film (steps S5 and S6). The soft coating application process is performed in two steps: undercoating with a machine tool such as a flow coater (step S5) and intermediate coating with a machine tool such as a roll coater (step S6). After application, 24 hours on a drying shelf. Perform the drying process to the extent. By forming the soft coating film, even when the decorative plate is bent with a small radius of curvature, it is possible to prevent the protrusion plate from cracking and to prevent the coating film itself from cracking.

  As a soft coating for undercoating, for example, TA22-068F; 6000 parts by weight, polyisocyanate for coatings {"Coronate (registered trademark) L" (trade name) manufactured by Nippon Polyurethane Industry Co., Ltd.}; 800 parts by weight, two-part type Urethane sealer {"NTX-GR-920" manufactured by Sanyu Paint Co., Ltd.) (trade name) A liquid: B liquid: thinner = 1: 1: 0.4 to 0.6}; 5000 parts, and curing catalyst {“Neostan (registered trademark) U” (trade name)} manufactured by Nitto Kasei Co., Ltd .; 110 parts by weight were mixed, and the viscosity index measured with Iwata Viscosity Cup NK-2 (manufactured by Anest Iwata Co., Ltd.) was 45 seconds. It is possible to use a drug adjusted so that

  As a soft coating for intermediate coating, for example, polyurethane resin {"TA22-068F" (trade name) manufactured by Hitachi Chemical Polymer Co., Ltd. [polyurethane resin: 50 wt%, butyl acetate: 25 wt%, methyl ethyl ketone: 25 wt%] }; 3000 parts by weight, alkyd resin {“Teslac (registered trademark) 2012-60B” (trade name) manufactured by Hitachi Chemical Co., Ltd.] [Alkyd resin: 60% by weight, butyl acetate: 40% by weight]}; Polyisocyanate for coatings {Nippon Polyurethane Industry Co., Ltd. “Coronate (registered trademark) L” (trade name)}; 2200 parts by weight, two-component urethane sealer, and curing catalyst {Nitto Kasei Co., Ltd. “Neostan (registered trademark)” U-100 "(trade name)}; 100 parts by weight were mixed, and Iwata viscosity cup NK-2 (Anest Iwata Corporation) Indication of viscosity measured at Company Ltd.) can be used to adjust the drug so that 45 seconds.

  Next, a polishing process is performed in which the upper surface of the soft coating film formed on the surface of the protruding plate is polished by a machine tool such as a wide belt sander (step S7). The polishing in step S7 is a step for improving the adhesion between the hard coating film formed by the hard coating applied thereafter and the soft coating film, and can be omitted. Further, since the intermediate coating of the soft paint in step S6 is a process for forming a coating film for polishing, when the polishing process of step S7 is omitted, the intermediate coating of step S6 is also omitted, As an application process, it is good also as a process of only undercoating of Step S5.

  Next, a hard coating application process is performed in which a hard coating is formed on the polished upper surface of the soft coating by using a machine tool such as a flow coater (step S8). After applying the hard paint, a drying process is performed for about 48 hours on a drying shelf. In addition, when the temperature of a drying chamber is 10 degrees C or less, forced drying is performed with warm air. The dried hard coating film has a higher coating film surface strength than the soft coating film after drying. The coating film surface strength here is a pencil hardness measured by a pencil hardness test (pencil scratch test) defined as JISK5600-5-4. By forming a hard coating film, the surface hardness can be increased. Moreover, since the soft coating film is formed under the hard coating film, even when the decorative board is bent, the hard coating film is prevented from being cracked.

  As the hard paint, for example, a two-component urethane resin paint {“NTX-W-12-575” (trade name) manufactured by Sanyu Paint Co., Ltd., A liquid: B liquid: thinner = 1: 1: 0.1-0 .3 (weight ratio)} can be used which is adjusted so that the viscosity index measured by Iwata Viscosity Cup NK-2 (manufactured by Anest Iwata Co., Ltd.) is 45 seconds.

  Next, a polishing process is performed in which the upper surface of the hard coating film formed on the surface of the protruding plate is polished with a fineness of about 400 using a machine tool such as a wide belt sander (step S9).

  Next, a top coating (finishing) process is performed in which a top coating (finishing) agent is applied to the upper surface of the polished hard coating film by a machine tool such as a roll coater (step S10). After applying the top coat, a drying treatment is performed in a drying shelf.

  As the top coat, for example, urethane paint {"Cerawood (registered trademark) House CWH-80" (trade name)} manufactured by Sanyu Paint Co., Ltd. can be used. Cerawood House CWH-80 is a liquid urethane paint used by mixing a main agent and a curing agent.

  After the top coat is applied, a drying process is performed in a drying shelf to complete a decorative board processed with a veneer. In this way, the decorative board is manufactured.

  Next, the cutting process (groove formation) is performed by cutting the back side of the veneer to which the base plate is attached with a machine tool such as a V-cut machine to form a V-shaped bent groove reaching the middle of the veneer. Step) is performed (step S11). The folding groove is formed at a so-called valley fold position inside a corner formed by bending when it is folded to be attached to the middle core material. The V-shaped angle and depth are determined based on the bending angle and the thickness of the decorative plate. Furthermore, when the bending groove does not reach the protruding plate, the protruding plate is easily cracked during bending, and when the bending groove exceeds the protruding plate, the design of the edge is impaired.

  Next, the cut decorative board is bent along the bending groove (step S12), and the back surface of the decorative board is attached to the surface of the core material (step S13), and the bending attachment process is performed. In addition, an adhesive is apply | coated to the surface of a center core material, or the back surface of a decorative board in the bending sticking process. Then, after the adhesive is cured, a necessary finishing process is performed to complete the decorative board. In this way, a natural wood decorative board is manufactured.

  Each step of manufacturing the wood-based composite material from the decorative board will be further described. FIG. 2 is an explanatory view schematically showing an example of a natural wood decorative board after cutting in the method for producing a woody composite material described in the present application. FIG. 2A is a schematic perspective view showing the appearance of the decorative board 1, and FIG. 2B is an enlarged view around the folding groove 1a of the decorative board 1 indicated by a broken line in FIG. FIG. As shown in FIG. 2 (a), the upper surface of the decorative plate 1 has a grain of a protruding plate, and a plurality of bent grooves 1a are formed on the lower surface.

  In FIG. 2A, a dotted line indicates a position where the decorative board 1 is bent, and a bending groove 1a is formed below the bending position. The bending position is a corner portion when pasted on a rectangular parallelepiped medium core, a portion that is bent once at 90 degrees to correspond to the corner portion, and is bent twice at 45 degrees to each corner. There is a place to correspond to the part. In a portion corresponding to one bend, one bending groove 1a having a V-shaped tip forming an angle of 90 degrees is recessed by cutting, and in a portion corresponding to two bends, , Two bent grooves 1a each having an angle of 45 degrees are recessed in parallel.

  FIG. 2 (b) schematically shows the periphery of the bending groove 1a. From the lower surface side to the upper surface side, the nonwoven fabric 10, the base plate 11, the nonwoven fabric 12, the protruding plate 13, the soft coating film 14, the hard coating The film 15 and the top coat film 16 are laminated. In addition, in order to make the thickness of the nonwoven fabric 10, the base plate 11, the nonwoven fabric 12, the protruding plate 13, the soft coating film 14, the hard coating film 15, and the top coating film 16 shown in layers in FIG. These are schematically shown by changing the ratio appropriately, and are different from the ratio of the actual layer thickness. The tip of the bending groove 1a reaches the middle of the protruding plate 13, and when the decorative plate 1 is bent, the protruding plate 13 is also bent. When the projecting plate 13 is bent, the projecting plate 13 may be cracked, but the soft coating film 14 suppresses the generation of the crack. Moreover, since the hard coating film 15 is formed by being laminated on the soft coating film 14, the hardness of the surface of the decorative board 1 is improved. In addition, when only the soft coating film 14 is formed without forming the hard coating film 15, the surface hardness becomes low. Further, when only the hard coating film 15 is formed without forming the soft coating film 14, the hard coating film 15 is easily cracked when the protruding plate 13 is bent.

  FIG. 3 is a schematic perspective view schematically showing an example of the bending and sticking step in the method for manufacturing a wood-based composite material described in the present application, and FIG. 4 is a method for manufacturing the wood-based composite material described in the present application. It is a schematic perspective view which shows typically an example of the completed wood type composite material. FIG. 3 is a plan view of the decorative sheet 1 which is bent on one side surface (the left side surface in FIG. 3), the upper surface, the other side surface opposite to the one side surface, and the lower surface. The situation of sticking is shown. The decorative plate 1 is already attached to the upper side and the upper surface of one side surface of the middle core material 2, and the decorative plate 1 is about to be attached to the other side surface, the lower surface, and the lower side of the one side surface. FIG. 4 shows a situation in which the decorative board 1 has been pasted, and the decorative board 1 wraps around the core material 2 consisting of one side, top, other side, and bottom of the core material 2. ing. In the example shown in FIG.3 and FIG.4, it is bent and stuck so that the boundary line which the one end and other end of the decorative board 1 may face may arise in the middle of the one side surface side of the core material 2. FIG. Further, at the corners that are the upper and lower ends of the one side of the middle core material 2, the decorative plate 1 is bent once by 90 degrees, and at the corners that are the upper and lower ends of the other side, the decorative plate 1 is 45. It is bent twice. In addition, the wood grain which appears on the surface (upper surface shown in FIG. 2) of the decorative board 1 is a natural thing of the one veneer which processed the wood, and the boundary line arises in a wooden grain also in the corner | angular part which bent the decorative board 1 It appears as a continuous grain without a beautiful finish. Therefore, compared with the case where different decorative materials such as a veneer and a wood grain sheet are attached to each surface of the core material 2, the wood-based composite material described in the present application has a sense of quality and excellent design. be able to.

<Example>
Next, the Example which concerns on the manufacturing method of the natural wood decorative board described in this application is described. Table 1 below shows the coating film conditions and test results for Examples 1 and 2 of the natural wood decorative board prepared for testing and Comparative Example.

In Example 1, Example 2, and Comparative Example, the base plate used was MDF, and the projecting plate used was a cedar cut. In Table 1, the items of “soft paint (undercoat)” and “soft paint (intercoat)” indicate the conditions of undercoat and intermediate coat in the soft paint application process described as steps S5 and S6 in FIG. . All of the soft coating application steps were under the same conditions, and each surface was coated with 14 g of a soft coating and 3 g of a soft coating on the surface of 1 scale ² (1 scale ² ). The soft paint used for the undercoat was TA22-068F / polyisocyanate for paint / two-component urethane sealer / curing catalyst mixed at 6000 parts by weight / 800 parts by weight / 5000 parts by weight / 110 parts by weight. The drug was adjusted so that the viscosity index measured at -5 was 45 seconds. The soft paint used for the intermediate coating is TA22-068F / TL2012-60B / polyisocyanate for paint / two-component urethane sealer / curing catalyst mixed at 3000 parts by weight / 5000 parts by weight / 2200 parts by weight / 2600 parts by weight. The drug was adjusted so that the viscosity index measured with Iwata Viscosity Cup NK-5 was 45 seconds. In addition, the chemical | medical agent illustrated in the manufacturing method demonstrated using FIG. 1 was used for each chemical | medical agent.

  In Table 1, the item “hard paint” indicates the conditions in the hard paint application process described as step S8 in FIG. The hard paint was applied to a surface of 1 sq. Angle in 30 g in Example 1 and 14 g in Example 2. In the comparative example, no hard paint is applied. The hard paint used was a two-component urethane resin paint {A liquid: B liquid: thinner = 1: 1: 0.2 (weight ratio)}, an index of viscosity measured with Iwata viscosity cup NK-2. Is a drug adjusted to be 45 seconds. In addition, the chemical | medical agent illustrated in the manufacturing method demonstrated using FIG. 1 was used for the chemical | medical agent.

  In Table 1, the item “overcoating” indicates the conditions in the overcoating process described as step S10 in FIG. All overcoating steps were performed under the same conditions, and 2 g of paint was overcoated on the surface of one horn. The paint used for the top coating is urethane paint (Cerawood). In addition, the chemical | medical agent illustrated in the manufacturing method demonstrated using FIG. 1 was used for the coating material.

  In Example 1, Example 2, and Comparative Example, all other conditions such as drying conditions were the same.

  In Table 1, the item “pencil hardness” indicates the result of the pencil strength test used as an index of the coating film surface strength. The pencil strength test was performed in accordance with a test method defined as JISK5600-5-4. As shown in Table 1, Example 1 was “3H”, Example 2 was “2H”, and Comparative Example was “B”. As a product, “3B” or more is necessary, and according to this standard, all of Example 1, Example 2, and Comparative Example satisfy the standard. Then, by forming a hard coating film, both Example 1 and Example 2 were able to obtain a more excellent result of “H” or more. Moreover, in order to suppress a crack, it is preferable to set it as "2H" or less, and the crack was not produced in any of Example 1, Example 2, and the comparative example which became "2H" or less.

  In addition to the above-mentioned coating film surface strength (pencil hardness), coating film adhesion test (JISK5600-5-6: cross-cut method), solvent resistance test (thinner, alkali, acid; solvent dripping, watch glass coating for 6 hours) After observing the surface condition), contamination test (magic, crayon, ink; after contamination by writing, wipe off ethanol and check the degree of contamination remaining), etc. Good results were obtained with all 2 and comparative examples.

  The above embodiment only discloses a part of the infinite number of examples of the present invention, and can be appropriately designed in consideration of various factors such as purpose, application, specification, and design.

  For example, in the above-described embodiment, one or two folding grooves are provided to be bent with respect to the corner portion of the core material, but three or more bending grooves are provided. , Can be deployed in various forms

  Further, for example, in the above-described embodiment, the form in which the periphery of the core material composed of one side surface, the upper surface, the other side surface, and the lower surface of the core material is wrapped with the natural wood decorative board is shown. The present invention is not limited to this, and it is possible to develop in various forms such as covering a part of the periphery of the three or two surfaces of the core material with a natural wood decorative board.

  Furthermore, in the said embodiment, although the form which performs a groove | channel formation process was shown after a soft paint application process and a hard paint application process, this invention is not limited to this, After performing a groove formation process, a soft paint application process In addition, it can be developed in various forms such as performing a hard paint application process.

1 Natural wood decorative board (decorative board)
1a Bending groove 10 Nonwoven fabric 11 Base plate 12 Nonwoven fabric 13 Veneer plate (single plate)
14 Soft coating film 15 Hard coating film 16 Top coating film 2 Core material

Claims (5)

A method for producing a wood-based composite material in which a natural wood decorative board is bent and attached to a core material,
The natural wood decorative board is
A soft paint application process in which a soft paint is applied to one side of a natural wood veneer to form a soft coating film,
A hard coating is applied to the surface of the soft coating film, and the coating surface strength after drying is manufactured by performing a process including a hard coating coating step for forming a hard coating film higher than the soft coating film,
A method for producing a wood-based composite material, comprising a step of bending and sticking the natural wood decorative board to a core material so that one surface side is the front side. A method for producing a wood-based composite material according to claim 1,
The natural wood decorative board is
A base plate is attached to the other side of the single plate,
Manufactured by a process including a groove forming process for forming a bent groove reaching the middle of the single plate from the base plate side,
The bending and sticking step is
The natural wood decorative board is bent along the bent groove formed in the groove forming step. A method for producing a wood-based composite material according to claim 1 or 2,
The method for producing a wood-based composite material, wherein the coating film surface strength after drying of the hard coating film formed by the hard coating application step is H or more in pencil hardness. A method of manufacturing a natural wood decorative board that is folded and stuck to a core material,
A soft paint application process in which a soft paint is applied to one side of a natural wood veneer to form a soft coating film,
Applying a hard paint to the surface of the soft coating film, and performing a hard paint coating step of forming a hard coating film having a coating film strength higher than that of the soft coating film after drying. A manufacturing method of a board. A wood-based composite material comprising a middle core material having corners formed by a plurality of adjacent surfaces, and a natural wood decorative board pasted across a plurality of adjacent surfaces of the core material. ,
The natural wood decorative board is
Natural wood veneer,
A soft coating film formed on one side of the veneer;
Formed on the surface of the soft coating film, and has a hard coating film whose surface strength is higher than that of the soft coating film,
The wood-based composite material, wherein the wood-based composite material is bent over a plurality of adjacent surfaces of the core material so that the one surface side is a front side, and is bent at a position corresponding to a corner portion of the core material.

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