JP2000167805A - Production of ligneous composite board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently produce a ligneous composite board in which smoothness of a rigid layer in a medium-density fiberboard forming the surface of the ligneous composite board is utilized as it is by sticking the medium-density fiberboard on the surface of a ligneous base board such as plywood. SOLUTION: Firstly, in the case of producing a laminated sheet A' by temporarily bonding a medium-density fiberboard 1 on the surface of a ligneous base board by an adhesive, cold clamping is performed in such a state that the surface rigid layers in the medium-density fiberboards 1 of the upper and lower laminated sheets are mutually positioned in an opposition state and a plurality of laminated sheets are piled. Then, a pair of upper and lower laminated sheets A' are heated and pressurized in such a state that the surface rigid layers of the medium-density fiberboards 1 are similarly positioned in the opposition state. Therefore, the surface rigid layer of the medium-density fiberboard 1 does not receive effect from a flaw caused on the hot platen of a hot press and dust stuck on the hot platen. A plurality of sheets of ligneous composite boards 10 holding a smooth surface rigid layer as it is, are obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a wood composite board having excellent surface smoothness used as a building material or a material for furniture.

[0002]

2. Description of the Related Art Conventionally, when a decorative wooden sheet, a decorative film or a decorative thin veneer is adhered to the surface of a wooden substrate such as a plywood or a veneer laminate, the wooden substrate is left as it is. (4) When used as a substrate for a decorative plate, the surface is rough, so that even if a decorative paper or the like is adhered, irregularities are generated on the decorative surface, and the commercial value is significantly reduced. For this reason, laminating a medium fiberboard thin at least on the surface of a wooden substrate has been performed. The medium fiber board has a denser surface than the above-mentioned wood substrate, and therefore, by laminating and adhering to the surface of the wood substrate, it is possible to obtain a wood composite board having a smooth surface and high hardness and surface properties. Can be.

[0003] Further, since the above-mentioned medium fiber board is obtained by adding a thermosetting adhesive to the wood fiber, forming and pressing under heat, the front and back layers are in contact with the heating surface. Is formed in a high-density hard layer called a bedrock layer, and this hard layer greatly contributes to the physical properties of the medium fiberboard, particularly the surface smoothness and surface hardness. The medium fiberboard is shipped after finishing the surface to a smoother surface by sanding, and the thickness of the hard layer is about 0.2 to 0.4 mm due to the sanding.

[0004]

The above-mentioned wood composite board is bonded to the surface of the wood board using a thermosetting adhesive with a medium fiber board and integrated by a hot press. Irregularities may occur on the surface of the medium fiberboard due to scratches or dust generated on the surface of the hot platen, and the smoothness of the medium fiberboard may be impaired. Such irregularities can be restored to a smooth surface again by grinding in the sanding process as described above.
When the thickness is 0.2 mm or more, the hard layer of the medium fiber board may be lost, and there is a problem that the surface hardness of the medium fiber board cannot be utilized.

[0005] The present invention has been made in view of such problems, and an object of the present invention is to provide a hot plate surface with a flaw on a hot platen when laminating and integrating a wood substrate and a medium fiberboard by hot pressing. It is an object of the present invention to provide a method for producing a wood composite board which can make full use of the surface smoothness and surface hardness layer of a medium fiber board without being affected by dust or the like.

[0006]

According to a first aspect of the present invention, there is provided a method for manufacturing a wood composite board, comprising the steps of: mixing a medium fiber board having a hard layer on an exposed surface side; A method of manufacturing a wood composite board which is attached to the front and back surfaces of a wood board thicker than a wood fiber board. First, a medium fiber board is placed on a mounting surface with the hard layer side facing down, A wood substrate coated with a thermosetting adhesive on both sides is loaded on the medium fiber board, and thereafter, a laminated board is formed by loading the medium fiber board with the hard layer facing upward on the wood substrate. I do. Further, by repeatedly forming such a laminated plate on the previously formed laminated plate, a laminated block body having an appropriate height composed of a plurality of laminated plates is formed. Next, the laminated block body is cold-pressed, and a medium fiber board is temporarily bonded to the front and back surfaces of the wooden substrate in each laminated board. Thereafter, after disassembling and separating the laminated block body into a plurality of laminated boards, at least two laminated boards are stacked and inserted into a hot press so that the hard layers of the medium fiberboard are in a state of being connected to each other. ,
By heating and pressurizing, a wood composite board is formed by bonding a medium fiber board to the front and back surfaces of the wood board.

[0007] The invention according to claim 2 is a method for manufacturing a wood composite board by laminating and integrating a medium fiber board only on the surface of the wood board. A laminated board is formed by laminating the back surfaces of the medium fiberboards whose front surfaces are formed into a hard layer via an adhesive. Furthermore, the surface hard layer of the next laminated medium fiber board is superimposed on the surface hard layer of the medium fiber board of the laminated board, and the wooden substrate is placed on the medium fiber board. The laminate is formed by laminating via an adhesive applied to the step (1). In this way, a plurality of laminated boards are sequentially stacked so that the hard layers of the medium fiberboard are overlapped in a belly-like manner, thereby forming a laminated block body having an appropriate height.
Next, the laminated block body is cold-pressed, and a medium fiber board is temporarily bonded to the surface of the wooden substrate in each laminated board. Thereafter, after disassembling and separating the laminated block body into a plurality of laminated boards, at least two laminated boards are stacked and inserted into a hot press so that the hard layers of the medium fiberboard are in a state of being fitted together, By heating and pressurizing, a wood composite board is formed by bonding a medium fiber board to the front and back surfaces of the wood board.

In the method for manufacturing a woody composite board according to the first or second aspect, the invention according to the third aspect is characterized in that a wooden board is laminated with a plurality of single boards in which a thermosetting adhesive is applied to both front and back surfaces. It is characterized by being formed from a substrate.

[0009]

According to the first aspect of the present invention, a medium fiberboard having a hard layer on the exposed surface side is laminated on both front and back surfaces of a wooden substrate via a thermosetting adhesive. A board is formed, a wood fiber board on which a thermosetting adhesive is applied to both the front and back surfaces of a medium fiber board having an exposed surface side formed as a hard layer on the medium fiber board of the laminated board in the same manner. A laminated block is formed by sequentially stacking the medium fiber boards and forming a laminated board, and by repeating this procedure, a laminated block is formed by laminating a plurality of laminated boards, and the laminate block is cold-pressed. Therefore, it is possible to simultaneously obtain a plurality of laminated boards in which a medium fiber board is temporarily bonded to the front and back surfaces of the wooden board, thereby improving productivity. Then, after cold pressing of the laminated block body, the laminated block body is disassembled into a plurality of laminated boards, and then at least two laminated boards are so arranged that the hard layers of the medium fiberboard are in a state of being connected to each other. Since they are stacked and inserted into a hot press and heated and pressurized, the medium-fiber boards joined in a belly-like manner do not come into contact with the hot press hot plate, so they are generated on the hot plate. It is not affected by scratches and dust adhering to the hot plate, and can efficiently produce several wood composite boards that retain the smooth surface hard layer of the medium fiberboard as it is. .

According to the second aspect of the present invention, the laminated board is formed by laminating the wood substrate on the back surface of the medium fiber board having the hard layer on the front surface side with the adhesive applied to the surface thereof. Then, the surface of the wooden substrate is laminated on the laminated board via the adhesive applied to the reverse side of the wood substrate on the reverse side of the medium fiberboard whose front side is similarly formed as the hard layer. Forming a laminated board, the following, to form a laminated block body of appropriate height by sequentially stacking a plurality of laminated boards formed by joining the hard layers of the medium fiber board in a bellows-like manner by the same procedure, Thereafter, since the laminated block body is to be cold pressed, it is possible to simultaneously obtain a plurality of laminated boards obtained by temporarily adhering a medium fiber board with the hard layer on the surface side of the surface of the wooden board and the temporary layer. it can. Then, at least two laminated boards are stacked so that the hard layers formed on the surface side of the medium fiber board are in an abdominal state, inserted into a hot press, and heated and pressed. As in the invention described in 1 above, the mid-sized fiberboard joined in an abdomen form does not come into contact with the hot platen of the hot press as a matter of course. It is not affected by the dust and the like, and several composite decorative boards in which the smooth surface hard layer of the medium fiber board is kept as it is can be efficiently manufactured.

[0011] The composite decorative board manufactured according to the first or second aspect of the present invention is finished by sanding a hard layer of a medium fiber board adhered to at least the surface thereof. On the other hand, the hard layer of the medium fiber board, when hot-pressing the wood substrate and the medium fiber board by hot pressing, has a smooth surface as it is overlapped in a belly-like manner, Therefore, no sanding is required or only a slight sanding treatment with a grinding thickness of 0.15 mm or less is required, so that the hard layer can be left even after grinding, so that a wooden decorative board having a high surface hardness and a smooth surface can be obtained. Obtainable.

According to the first aspect of the present invention, the hard layer of the medium fiberboard adhered to the back side of the wooden substrate has irregularities caused by dust and the like on the hot platen surface of the hot press. 0.1 ~ 0.4mm to eliminate or adjust overall thickness
Be ground.

According to the third aspect of the present invention, since the wooden substrate is formed by sequentially laminating a plurality of veneers coated with a thermosetting adhesive on both front and back surfaces, the wooden substrate is formed by hot pressing. At the time of bonding between the wood fiber board and the wood fiber board by heating and pressing, the wood board can be formed at the same time as the wood board is formed by bonding a plurality of veneers. Not only can the number of steps for forming be reduced, and energy can be reduced, but also the sanding process for finishing the surface of the wooden substrate itself is not required, so that it is possible to greatly simplify the process and save energy and resources, It is suitable for mass production and enables cost reduction.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a process of manufacturing a wooden composite board, and a plurality of wooden composite boards having a thickness of 1.0 to 4.5 mm. First, a medium fiber board (medium specific gravity wood fiber board) 1 and a plurality of veneers 2a for forming a wood board 2 having a thickness of 5.0 mm or more thicker than the medium fiber board 1 are prepared. As shown in FIG. 1 (a), one medium fiber board 1 is mounted on the mounting surface 3. The wooden substrate 2
A single wood substrate thicker than the medium fiber board 1 without being formed from a plurality of 2a veneers, for example, plywood, veneer laminate, LVL, LVB, particle board, strand board, laminated wood Etc. may be used.

The medium fiber board 1 is manufactured by a usual dry method, and has a hard layer 1a called a rock layer at least on the exposed surface side. Therefore, although the hard layer 1a may be provided on the front and back layers, the hard layer 1a may be provided only on the exposed surface (front surface) side, and such a medium fiber board 1 has a high front and back layer. Medium-density wood fiberboard in which the core layer is formed with low density with a hard layer of high density The low-density layer of the wood fiberboard is divided into two parts from the center in the thickness direction to have a hard layer 1a only on the exposed surface side The fiberboard 1 can be obtained.

After the medium fiber board 1 is placed on the mounting surface 3 with its hard layer 1a facing downward, the medium fiber board 1
The wooden substrate 2 on which adhesives 4 and 4 are applied on both sides is stacked.
In this case, when the wooden substrate 2 is a single piece of plywood or the like as described above, the next medium fiber board 1 is stacked on the wooden substrate 2 with its hard layer 1a facing upward. As shown in b), when the wooden substrate 2 is formed from a plurality of veneers 2a, the adhesives 4, 4 are applied to the front and back surfaces of each veneer 2a, and the veneer 2a The layers are sequentially stacked on the fiberboard 1. At this time, the fiber direction of each veneer 2a is
Single veneer 2 that is set according to the purpose of use and is vertically adjacent
The fibers may be stacked with the fiber directions of a and 2a in the same direction, or stacked perpendicular to each other.

As the adhesive 4 applied to the front and back surfaces of the veneer 2a, a thermosetting resin adhesive such as a urea resin, a melamine resin, a phenol resin, a polyester resin, a urethane resin, or an epoxy resin is used.

After stacking a plurality of veneers 2a to form a wood substrate 2 having a constant thickness, as shown in FIG. 1 (c), the upper surface of the wood substrate 2, ie, the uppermost veneer, Next, by stacking the next medium fiberboard 1 with its hard layer 1a facing upward, the medium fiberboard 1,
1 is formed.

Further, a second laminated plate A 'is formed on the laminated plate A' as shown in FIG. 1D by using the laminated plate A 'as a first laminated plate by the same procedure as described above. That is, the hard layer 1a of the medium fiber board 1 loaded on the top of the first laminate A '
The hard layer 1a of the medium fiber board 1 for forming the surface layer of the laminated board A 'is overlapped in a bellows shape, and then the adhesive 4 is applied to the front and back surfaces of the medium fiber board 1 in the same manner as described above. After a plurality of veneers 2a coated with the substrate 4 are sequentially stacked to form a wood substrate 2, the medium fiber board 1 is placed on the wood substrate 2 with its hard layer.
The second laminated board A 'is formed by stacking with 1a facing upward.

By repeating such a forming process of the laminated plate A 'even number of times as necessary, a laminated block body A of an appropriate height formed by stacking a plurality of (even number) laminated plates A' is formed. I do. The total height of the laminated block body A is about 60 cm at the maximum, and the number of stacked sheets is determined by the thickness of one laminated plate A '.

The laminated block body A composed of a plurality of laminated boards A 'thus formed is applied to the upper and lower surfaces of the laminated block body A before the adhesive 4 applied to the front and back surfaces of each veneer 2a is cured. As shown in FIG. 1 (e), the upper and lower pressing plates 6a, 6b
And cold-press at a predetermined pressure for about 10 to 30 minutes. By this cold pressing, each laminated board A 'is brought into a state in which the intermediate fiber board 1 is temporarily bonded to the front and back surfaces of the wooden board 2. On this occasion,
When the wooden substrate 2 is formed by a plurality of veneers 2a, all veneers 2a are temporarily bonded to each other by the adhesive 4 applied to the front and back surfaces.

Next, the laminated block body A subjected to the cold pressing treatment is disassembled into a plurality of laminated plates A 'as shown in FIG. 1 (f). At this time, the laminated layers A ′, A ′ vertically adjacent to each other were joined in such a manner that the hard layers 1a, 1a of the medium fiberboards 1, 1, which are exposed surface sides to each other, without interposition of an adhesive, were connected to each other. In this state, and in each of the laminated boards A ′, since the intermediate fiber board 1 is temporarily bonded to the front and back surfaces of the wooden substrate 2 via the adhesive 4, a plurality of laminated block bodies A can be easily and surely formed. Can be separated and disassembled into a laminate A ′.

After the disassembly of the laminated block body A, the two laminated plates A ′ were joined in a bellows shape at the time of the cold pressing,
That is, the hard layer 1 serving as the surface layer of the wood composite board 10 to be obtained
a and 1a are overlapped again so as to form an abdomen, and then inserted into a hot press 7 as shown in FIG.
The upper and lower hot plates 7a, 7b at a predetermined pressure and temperature for a certain time,
The adhesive 4 is cured by the heat and pressure treatment to form the wood substrate 2 in which the single plates 2 a forming the wood substrate 2 are integrated in the two laminated boards A ′ and A ′. To produce two wood composite boards 10 and 10 in which the medium fiber boards 1 and 1 are integrally bonded to the front and back surfaces. Hereinafter, similarly, the two laminated boards A ′ and A ′ are subjected to the heat and pressure treatment by the hot press 7 in the same manner as described above to obtain the wood composite boards 10 and 10.

The wood composite boards 10, 10 which have been hot-pressed by the hot press 7 are taken out of the hot press 7 and separated from their mating surfaces. The hard layer 1a of the medium fiberboard 1, which is the abdominal mating surface, becomes the surface of the wood composite board 10,
The hard layer 1a of the medium fiber board 1 on the other surface which is in contact with the hot plates 7a and 7b of the hot press 7 is the back surface. Therefore, the wooden composite board 10 which is hot pressed without contacting the hot plates 7a and 7b of the hot press 7
The surface-side medium fiber board 1 retains the original smooth surface hard layer 1a as it is, and the hard layer 1a of the medium fiber board 1 is applied to the surface without decorative paper or decorative paper without sanding. A film or a decorative sheet such as a decorative veneer is directly adhered to form a wooden decorative board, or after the surface hard layer 1a is subjected to a sanding treatment, a decorative sheet is adhered to the surface thereof. To form a wood veneer.

When sanding the hard layer 1a on the surface side of the wooden composite board 10, as described above, since the surface of the hard layer 1a is a smooth surface, a slight sanding treatment with a grinding thickness of 0.15 mm or less is sufficient. Therefore, the hard layer can be left even after the grinding, so that a decorative wooden board having a high surface hardness and a smooth surface can be obtained. On the other hand, the hard layer 1a of the medium fiber board 1 on the back side of the wood composite board 10 comes into contact with the hot plates 7a and 7b of the hot press 7 when the wood composite board 10 is formed. It is formed on a fine uneven surface by scratches and dust attached on the hot platen,
In order to eliminate the unevenness or to adjust the thickness of the whole wooden composite board 10, it is ground by about 0.1 to 0.4 mm.

In the above method for producing a wood composite board,
The method of manufacturing the wood composite board 10 in which the hard fiber layers 1a and 1b are integrally attached to the front and back surfaces of the wood board 2 with the hard layer 1a facing the exposed surface side has been described. A wood composite board 10 'obtained by sticking the medium fiber board 1 with the hard layer 1a facing the exposed surface side can be obtained by the same manufacturing method as described above.

FIG. 2 is a view showing the manufacturing process, in which the thickness is 1.
Multiple medium fiberboards of 0 to 4.5 mm (medium specific gravity wood fiberboard)
1 and a wood substrate 2 having a thickness of 5.0 mm or more, which is thicker than the medium fiberboard 1, is prepared. First, as shown in FIG. Place the wooden substrate 2 on the mounting surface 3
Place on. Note that the wooden substrate 2 may be formed by laminating and bonding a plurality of single plates 2a as described in the above manufacturing method.

The medium fiberboard 1 is placed on the surface (upper surface) of the wooden substrate 2 with its hard layer 1a facing upward, as shown in FIG. 2 (b). To form
Next, as shown in FIG. 2 (c), the intermediate fiber board 1 for forming the second laminated board A 'is formed on the laminated board A' using the laminated board A 'as a first laminated board. The surface hard layer 1a faces downward, that is, overlaps with the hard layer 1a of the intermediate fiber board 1 of the first laminated board A 'so as to be in a belly-like shape. The second laminated board A 'is formed by stacking the wooden substrate 2 having only the surface coated with the adhesive 4 so that the adhesive 4 is stacked on the hard layer 1a of the medium fiber board 1. I do.

As described above, the hard layers 1a of the intermediate fiber boards 1 and 1
Multiple laminated boards A 'so that 1a overlap each other
Are stacked in order to form a laminated block body A having an appropriate height as shown in FIG. 2 (d). Thereafter, the upper and lower surfaces of the laminated block body A, that is, the wood substrate of the uppermost laminated board A ' 2
Are arranged on the back surface (upper surface) of the bottom plate and the back surface (lower surface) of the wood substrate 2 of the lowermost laminated board A '.
As shown in FIG. 2 (e), the sheet is cold-pressed at a predetermined pressure for about 10 to 30 minutes by the upper and lower pressers 6a and 6b. By this cold pressing, each laminated board A 'is brought into a state in which the intermediate fiber board 1 is temporarily bonded to the surface of the wood substrate 2.

Next, the laminated block A subjected to the cold pressing treatment is disassembled into a plurality of laminated plates A 'as shown in FIG. 2 (f). After disassembly of the laminated block body A, two laminated boards A ′
The surface joined in a bellows shape at the time of the cold pressing, that is,
Hard layer 1 to be the surface layer of wood composite board 10 ', 10' to be obtained
After a and 1a are overlapped again so as to be in a belly shape, they are inserted into the hot press 7 as shown in FIG.
The upper and lower hot plates 7a, 7b at a predetermined pressure and temperature for a certain time,
An adhesive 4 is hardened by a heat-pressure treatment, and the medium fiber board 1 is bonded to only the surface of the wooden substrate 2 with the hard layer 1a facing the exposed surface side. Board
10 ', 10' is manufactured. Thereafter, similarly, the two laminated boards A ′, A ′ are subjected to the heat and pressure treatment by the hot press 7 in the same manner as described above to obtain the wood composite boards 10 ′, 10 ′.

The wood composite boards 10 ', 10' which have been hot-pressed by the hot press 7 are taken out of the hot press 7 and separated from their mating surfaces. The hard layer 1a of the medium fiber board 1, which is the abutting surface, becomes the surface of the wood composite board 10 ', and the wood board 2 in contact with the hot plates 7a, 7b of the hot press 7.
Is the back surface of the wooden composite board 10 '. Therefore, the intermediate fiber board 1 of the wood composite board 10 that has been hot pressed without contacting the hot plates 7a and 7b of the hot press 7 has the original smooth surface hard layer 1a.
And the hard layer 1a of the medium fiberboard 1
A decorative paper or a decorative film, or a decorative sheet such as a decorative veneer directly on the surface without sanding to form a wooden decorative board, or the surface hard layer 1a
Is subjected to a sanding treatment, and a decorative sheet is adhered to the surface to form a wooden decorative board.

When sanding the hard layer 1a of the medium fiberboard 1 forming the surface of the wood composite board 10 ', as described above, since the surface of the hard layer 1a is smooth, the ground thickness is small.
A slight sanding treatment of 0.15 mm or less is sufficient, so that the hard layer can be left even after grinding, so that a decorative wooden board having a high surface hardness and a smooth surface can be obtained. The wood composite board shown in FIGS. 1 and 2
In the manufacturing steps 10 and 10 ′, the cold pressing step may be performed using the hot plates 7a and 7b without heating the hot press 7.

[Brief description of the drawings]

FIG. 1 is a process diagram for explaining a method of manufacturing a wood composite board obtained by attaching a medium fiber board to the front and back surfaces of a wood board,

FIG. 2 is a process diagram for explaining a method of manufacturing a wood composite board in which a medium fiber board is attached to the surface of a wood board.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Medium fiber board 1a Hard layer 2 Wood substrate 4 Adhesive 7 Hot press 10 Wood composite board A Laminated block A 'Laminated board

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Kenichi Kawataka 2-3-18 Nakanoshima, Kita-ku, Osaka-shi F-term in Daiken Kogyo Co., Ltd. (reference) 2B200 AA07 BB01 BB15 DA04 EF11 EG01 EG13 EG15 FA24 FA31 FA33 HA03

Claims (3)

[Claims] 1. A method for producing a wood composite board, comprising: bonding a medium fiber board having an exposed surface side to a hard layer to front and back surfaces of a wood substrate thicker than the medium fiber board, A wood substrate coated with a thermosetting adhesive on both front and back sides is placed on a medium fiber board with the hard layer facing downward, and a medium fiber board is loaded on the wood substrate with the hard layer facing upward. By forming a laminated board with a medium fiber board on the front and back of the wood substrate,
While repeatedly forming this laminate, a plurality of laminates are sequentially stacked to form a laminate block having an appropriate height. Thereafter, the laminate block is cold-pressed and a table of the wood substrate in each laminate is formed. After temporarily bonding a medium fiber board to the back side, and then disassembling the laminated block body into a plurality of laminated boards,
At least two laminated boards are stacked and inserted into a hot press so that the hard layers of the medium fiber board are in an abdominal state, and the medium fiber board is bonded to the front and back surfaces of the wood substrate by heating and pressing. A method for producing a wood composite board, comprising forming a wood composite board. 2. A method for producing a wood composite board, comprising: attaching a medium fiber board having a hard layer on the surface side to a surface of a wood substrate thicker than the medium fiber board. The laminated board is formed by laminating a medium fiber board with the hard layer facing upward on the surface of the wooden board through an adhesive applied to the surface of the board, and then forming a hard board on the medium fiber board of the laminated board. A different laminated board is formed by placing the next medium fiber board with the layer facing downward and laminating a wood substrate coated with an adhesive on the lower surface on the medium fiber board, in this way A plurality of laminated boards are sequentially stacked so that the hard layers of the medium fiberboard are overlapped in a belly-like manner to form a laminated block body of an appropriate height, and thereafter, the laminated block body is cold-pressed. A medium fiberboard is temporarily bonded to the surface of the wooden substrate in each laminate, and then the laminate board is After disassembling the lock body into a plurality of laminated boards, at least two laminated boards are stacked and inserted into a hot press so that the hard layers of the medium fiberboard are in an abdominal state, and the wooden body is heated and pressed. A method for producing a wood composite board, comprising forming a wood composite board by bonding a medium fiber board to the front and back surfaces of a substrate. 3. The method for manufacturing a wood composite board according to claim 1, wherein the wood board is a laminated board of a plurality of single boards coated with a thermosetting adhesive on both sides. .