JPH07132509A - Laminated woody plate and decorative laminated woody plate - Google Patents

Abstract

PURPOSE:To produce a decorative veneer whose strength in all directions is uniformed by setting the number of layers of oriented timber sheet laminated plates where orientation directions of the adjacent layers cross rectangularly to an odd number, adjusting orientation direction strengths of both surface layers of a laminated woody plate by a thickness ratio of the surface layers and an inner layer, and sticking a decorative veneer to one face. CONSTITUTION:In a laminated woody plate, oriented timber sheet laminated plates 1, 2, 3 are layered such that an orientation direction in each of adjacent layers crosses rectangularly to each other. A thickness ratio of a surface layer 1, an inner layer 2, and a surface layer 3 is 1:2:1. Accordingly, the thickness strength of the orientation directions in the surface layers 1 and 3 becomes the same as the strength of the inner layer 2, so that thickness strengths of the orientation directions in all directions are uniformed. A decorative veneer 4 is stuck to one face 1 so as to produce a decorative laminated woody plate. By adjusting the thickness ratio, the thickness strength in each direction is changed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a laminated wood board which is obtained by laminating directional timber laminated boards, so-called OSB, and can be used as a board material for building materials, furniture, furniture, and the like. The present invention relates to a decorative laminated wood board, and in particular, the strength of the laminated wood board is leveled in all directions, the bending strength in a specific direction is strengthened, and the laminated wood board is excellent in elasticity and smoothness as a floor board. The present invention relates to a decorative laminated wood board such as a floor board used.

[0002]

2. Description of the Related Art In recent years, deforestation has become a problem from the viewpoint of environmental protection, and it is clear that it will be more difficult to obtain wood resources in the future. Therefore, it is expected that supply of plate materials such as plywood produced by consuming a large amount of wood resources will be unstable or insufficient, and the price will also rise. For example, as a floor board which is relatively inexpensive and can be mass-produced, a floor board manufactured by attaching a decorative veneer 4 to one surface of a plywood 5 as shown in FIG. 5 has been used. Since this plywood is made by laminating a plurality of veneer veneers so that the grain directions thereof are orthogonal to each other, the plywood naturally has the above resource problem. Therefore, it is required to replace it with another material that is easily available and has few resource problems.

From this point of view, as an alternative to general plywood, wood flakes, which have been conventionally scrapped, wood fibers obtained by defibrating wood chips, and the like, have been attracting attention, and various of these are used. Application to the field came to be tried. By the way, it is needless to say that a wooden floorboard is generally required to have sufficient physical properties such as sufficient strength, rigidity, surface hardness, and smoothness, but in addition to this, it is necessary to have elasticity suitable for walking. In many cases, a long and slender floor board is placed across a joist to stretch the floor, so that it is required to have a large bending strength especially in the longitudinal direction. Therefore, in order to use the above-mentioned wood board as a floor board, these physical property requirements must be satisfied.

Generally, a wood board using wood flakes or wood fibers is obtained by integrally bonding these wood flakes or wood fibers, which are the constituent elements, with a binder. In these wood boards, as the size of the constituent elements becomes smaller, the texture becomes more uniform and the surface becomes smoother, but the strength and rigidity tend to decrease, and the density tends to increase. On the contrary, as the size of the components increases, the strength and density that wood originally possesses is approached, but such a wood board is inhomogeneous and the surface unevenness increases. When these are used for floorboards, for example, with a wood fiberboard containing wood fibers as a constituent, the size of the constituents is small, so a woodboard having a uniform and smooth surface can be obtained, but the strength is insufficient as a floorboard. However, if the plate thickness is increased in order to achieve high strength, there is a problem that the density becomes high and the weight increases, making it difficult to handle. Here, as shown in FIG. 6, the wood thin pieces 6 are oriented and accumulated so that the directions of the wood fibers are almost constant,
The directional wood flakes laminated board that is integrally molded by bonding with a binder is called OSB (Oriented Strand Board),
It has come to be used as a structural face material. This directional timber laminated board has a large size of constituent elements, has a strength comparable to that of softwood plywood, and is superior to the above-mentioned wood fiber board as a floor board in strength and rigidity.

[0005]

However, since the directional wood thin-plate laminated board is oriented so that the direction of the wood fibers is almost constant, the orientation direction has a large strength, There was a problem that the strength was relatively weak in both the pulling and bending in the direction perpendicular to the direction. Further, the directional wood thin plate laminated board has a large compressive strength, but its surface is non-uniform and has large irregularities, so that there is a problem in the surface smoothness when a floor board is manufactured using this. Therefore, a method of adhering a decorative veneer or a base material and a decorative veneer on the surface was examined, but in this case, the obtained floor board tended to be warped or twisted. The present invention has been made to solve the above problems, and therefore an object thereof is that the strength is leveled in all the directions of the surface, and the bending strength in the longitudinal direction of the floorboard is enhanced, and An object of the present invention is to provide a laminated wood board and a decorative laminated wood board having elasticity and flatness suitable for walking when using this as a floor material.

[0006]

[Means for Solving the Problems] The above-mentioned problem is, in a laminated wood board formed by laminating two or more laminated directional timber laminated boards, the orientation directions of the directional timber laminated boards in adjacent layers are orthogonal to each other. It can be solved by providing a tempered laminated wood board. In the above, the laminated wood board has a laminated number of the directional wood thin-plate laminated boards of an odd number of 3 or more, and by changing the thickness ratio of both surface layers and inner layers, It is preferable that the strength is adjusted. In the above, the laminated wood board, the sum of the thickness of the surface layer is made larger than the sum of the thickness of the inner layer, the strength in the direction along the orientation direction of the surface layer is made larger than the strength in the direction along the orientation direction of the inner layer. It is preferably one. The present invention also provides a decorative laminated wood board in which a decorative veneer or a base material and a decorative veneer are attached to at least one surface of the laminated wood board. In the above, it is preferable that the layered structure of the laminated wood board is asymmetric in the thickness direction.

[0007]

[Function] As described above, the general directional wood thin plate laminated plate is
Although the strength of the laminated wood board is weak in the direction perpendicular to the orientation direction, the laminated wood board of the present invention comprises a directional wood thin laminated board.
Since more than one layer is laminated and the orientation directions of the adjacent layers are made orthogonal to each other, the tensile strength and the bending strength are equalized and strengthened in all the directions of the surface. At this time, if the number of laminated layers is an even number and the thickness and strength of each directional wood thin plate laminated board are equal, the strength of the obtained laminated wooden board becomes uniform in all directions of the plane. If the number of stacked layers is an odd number of 3 or more, the orientation directions of both surface layers are always the same,
Moreover, since the number of layers of the directional timber laminated board oriented in that direction is always one more than that of those having an orientation direction perpendicular to this, this laminated wood board is further strengthened in the orientation direction of the surface layer. It will be. The degree can be adjusted by changing the thickness ratio between the two surface layers and the inner layer.

The present invention will be described in detail below. Directional wood flakes laminated board forming the laminated wood board of the present invention, for example, wood flakes are mixed with a binder, and the resulting mixture is oriented and accumulated so that the directions of the wood fibers are almost constant, and heat is applied. It is a plate-shaped integrally molded product that is bonded by applying pressure. As the wood flakes, for example, flakes of red pine, larch, ezo pine, todo pine, aspen, lodgepole pine, and the like are suitable, but the tree species is not particularly limited. The size and shape of the wood flakes are not particularly limited, but most of them have a thickness of 0.4 to 0.8.
mm, length 20 to 100 mm, width 2 to 60 mm, and elongated shape in the direction of the wood fiber is preferable. In this case, it becomes easy to orient and accumulate the wood flakes so that the directions of the wood fibers are almost constant.

As the binder to be mixed with the wood flakes,
Any synthetic resin adhesive used in this field can be used. However, since surface hardness is required for the directional wood thin plate laminate used as the surface layer material of the laminated wood board of the present invention, a binder having a high hardness, for example, a phenol resin, a urea resin, a melamine resin, an epoxy resin is used. ,
A polyurethane resin, a mixture thereof, or the like is preferable. Further, as the inner layer material, moderate elasticity and light weight are required, and therefore it is preferable to use a foamable binder. Here, the expandable binder is one in which wood flakes are toughly adhere to each other and also foams themselves, and this foaming causes the binder resin to penetrate into the minute gaps of the wood flakes, and a small amount of binder is sufficient. It is possible to obtain an adhesive area and reduce the density of the integrated product. The foamable binder may be composed of a resin that self-foams, or may be composed of a non-foaming resin and a foaming agent. Examples of self-foaming resins include foamable polyurethane resins. Further, examples of the non-foaming resin foamed by the foaming agent include non-foaming polyurethane resin, polystyrene resin, epoxy resin, polyvinyl chloride resin, phenol resin, urea resin, or a mixture thereof.
The foaming agent may be a volatile foaming agent such as CCl ₃
F, CCl ₂ F ₂ , or CCl ₂ F-CClF ₂ , or the like, or a thermally decomposable foaming agent such as azodicarbonamide, azohexahydrobenzonitrile, 2,2′-azoisobutyronitrile, benzenesulfhydrazide, Alternatively, N, N′-dinitroso-N, N′-dimethylterephthalamide and the like can be mentioned. Further, these expandable binders may contain non-expandable binders such as urea resin, melamine resin, and phenol resin.
These mixing ratios can be appropriately adjusted according to the intended density of the laminated wood board.

The ratio of the binder to the thin wood pieces is preferably 10 to 30 parts by weight based on 100 parts by weight of the wood fiber. If the amount is less than 10 parts by weight, the thin wood pieces are not sufficiently adhered, and if the amount exceeds 30 parts by weight, the density of the obtained laminated wood board becomes excessively heavy and the characteristics of wood are lost.

In the production of a directional wood flakes laminated plate, first, wood flakes and a binder are mixed so that the binder is uniformly attached to the surfaces of the respective wood flakes, and this mixture is mixed with the wood fibers of the wood flakes. Are oriented and accumulated so that the direction of is almost constant. This orientation is easy because the thin wood pieces are formed in a slender shape in the direction of the wood fibers so that they can be accumulated in the same length direction. A directional wood thin laminated plate can be obtained by heat-pressing and adhering this aggregate and integrally forming it into a plate shape. The plane dimension of the directional wood thin plate laminate obtained by applying heat and pressure is arbitrary, but its thickness is preferably about 5 mm to 20 mm. The density is preferably 0.40 to 0.65 g / cm ³ . If the density is less than 0.40 g / cm ³ , the strength of the plate will be insufficient, and conversely the density will be 0.65 g / cm ^3.
If it is larger than cm ³ , the total weight increases and it becomes difficult to handle. It is preferable that the bending Young's modulus of this directional wood thin plate laminate is about 40 to 80 × 10 ² MPa in the orientation direction. If the Young's modulus of bending is less than 40 × 10 ² MPa, the bending of the laminated wood board becomes excessive,
When it exceeds 80 × 10 ² MPa, for example, when this is used as a floor board, the appropriate elasticity required for walking becomes insufficient.

The laminated wood board of the present invention is manufactured by laminating two or more layers of the above-mentioned directional wood flakes laminated board, in which the orientation directions of the directional wood flakes laminated board in adjacent layers are mutually different. Lay them so that they are orthogonal. This lamination is a process of accumulating a mixture of wood flakes and a binder in the process of forming a directional wood flakes laminated plate, and sequentially accumulating them so that their orientation directions are orthogonal to each other, and then hot pressing the multi-layered agglomerates. It may be carried out by a method of integrally molding by adding,
Also, after manufacturing each directional wood thin laminated plate separately,
You may apply | coat an adhesive agent on a lamination surface and may laminate | stack. As this adhesive, in addition to the above-mentioned various binders, vinyl-based adhesives,
Any of those conventionally used for adhering wooden boards such as acrylic and rubber can be used. When laminating is performed in the process of accumulating the mixture of the wood flakes and the binder, the binder contained in each layer adheres the layers, so that no additional adhesive is required. As described above, by any method, since at least two layers of directional wood flakes are laminated with their orientation directions orthogonal to each other, the obtained laminated wood board is stretched in all directions of the plane. Strength and flexural strength are leveled and strengthened. As the number of laminated layers increases, the strength in the surface direction is more evened and strengthened, and is stable against bending, warping, and twisting.

In the laminated wood board used as the floor board, it is required that the bending strength is appropriately strengthened in a specific direction, particularly in the longitudinal direction. In this case, the laminated number of the directional wood thin laminated plates is an odd number of 3 or more, the orientation direction of the surface layer is aligned with the longitudinal direction, and adjacent layers are laminated so that the orientation directions thereof are orthogonal to each other, and both of them are laminated. The thickness ratio between the surface layer and the inner layer is adjusted appropriately. Thereby, the strength in the longitudinal direction of the laminated wood board, for example, the bending strength is suitably adjusted.

Direction difference of strength in the plane of the laminated wood board,
That is, the anisotropy can be adjusted not only by increasing the strength along the orientation direction of the surface layer but also by decreasing it. For example, if the thickness ratio of both surface layers is gradually reduced from surface layer: inner layer: surface layer = 1: 1: 1 while keeping the overall thickness of the laminated wood board constant, at first, High strength along the orientation direction gradually decreases and becomes uniform strength in all directions. Furthermore, a laminated wood board whose strength in that direction is smaller than that in the perpendicular direction can be obtained. It also becomes like. in this way,
The present invention includes all laminated wood boards whose strength anisotropy is adjusted by the thickness ratio of both surface layers and inner layers.

The surface of the laminated wood board obtained by laminating the laminated directional wood flakes is inferior in cosmetic property because the wood flakes are directly exposed on the surface. Therefore, in order to use this laminated wood board as an interior material such as a floor board, it is preferable to attach a decorative veneer on at least one surface. At this time, it is preferable that the surface of the laminated wooden board serving as the base material is polished by a method that has been conventionally used, and a decorative veneer is attached to the polished surface. Further, in the case where the bare wood laminated with the directional wood thin plate can be seen through the decorative veneer, an opaque base material may be interposed between the base material and the decorative veneer. The decorative veneer used here is not particularly limited, but a decorative veneer having a thickness of about 0.2 to 0.8 mm which has been conventionally used, such as an oak veneer, can be used.
Further, as the opaque base material, for example, paper or the like can be used. When the base material is used, the decorative veneer may be thin. The surface of the decorative veneer may be further coated with urethane having a thickness of about 40 to 60 μm.

The above decorative laminated wood board having a decorative veneer attached on one side thereof, when the laminated wood board as the base material is symmetrically constructed from the center in the thickness direction, changes in environment such as temperature and humidity. It may be bent, warped or twisted under the influence of. These can be prevented by making the layer structure of the laminated wood board serving as the base material asymmetric in the thickness direction. Specifically, for example, a method of changing the thickness and material of both surface layers, or forming a plurality of grooves extending in a direction perpendicular to the orientation direction of the surface on the surface (back surface) to which the decorative veneer is not attached Can be asymmetrical.

In order to use the decorative laminated wood board of the present invention as a floorboard, the decorative laminated wood board is cut into squares, rectangles, etc. of a predetermined size, and if necessary, chamfered, finish-painted and other processed, and the side edges are Form male and female fruits. At this time, when making a square block shape or a relatively wide floor board,
It is preferable to use a decorative laminated wood board that has uniform strength in all directions of the surface and has little anisotropy, and in the case of an elongated rectangular floor board, a decorative laminate in which the strength is particularly strengthened in the longitudinal direction. It is preferable to use a wood board. In addition, the bending Young's modulus is 40
By adjusting the pressure to about 80 × 10 ² MPa, a floor board having elasticity that is comfortable for walking can be obtained.

[0018]

EXAMPLES Examples of the present invention will be described below. (Example 1) Fig. 1 shows a laminated wood board of Example 1. This laminated wood board is made up of three layers of directional wood thin laminated boards 1,
Two and three layers are laminated so that the orientation directions of the adjacent layers are orthogonal to each other. The thickness of this laminated wood board was 12 mm, the thickness of the directional wood flakes laminated boards 1 and 3 forming both surface layers was 3 mm, and the thickness of the directional wood flakes laminated board 2 forming the inner layer was 6 mm. It was That is,
The thickness ratio of surface layer: inner layer: surface layer is 1: 2: 1.

This laminated wood board was manufactured as follows. (Mixture 1) Using a shaving machine, wood flakes having a length of 30 to 50 mm, a width of 2 to 20 mm and a thickness of 0.15 to 0.20 mm were obtained from spruce wood. 100 parts by weight of the above wood flakes are put in a rotating drum rotating at a low speed, and 20 parts by weight of an aqueous phenol resin binder is spray-sprayed while the wood flakes are naturally falling in the rotating drum, and the wood flakes are mixed with phenol resin. The binder was uniformly applied to obtain a mixture 1 of wood flakes and binder.

(Mixture 2) Using a shaving machine, a length of 75 to 80 mm and a width of 5 to 50 were obtained from spruce wood.
A thin piece of wood having a thickness of 0.5 mm and an average thickness of 0.55 mm was obtained. 100 parts by weight of the above-mentioned thin wood pieces were put in a rotating drum rotating at a low speed, and 20 parts by weight of a mixture of a foaming urethane resin (crude MDI manufactured by Sumitomo Bayer Urethane Co.) and an unconcentrated urea resin in a weight ratio of 2: 1 was added. The wood flakes were spray-sprayed while the wood flakes spontaneously dropped in the rotary drum, and the foamable binder was uniformly applied to the wood flakes to obtain a mixture 2 of the wood flakes and the binder.

The mixture 1 was sprinkled on a hot pressing plate so that the wood flakes were oriented in one direction and had a thickness of 62 m.
It collected so that it might become m. Mixture 2 on top of this
Was sprayed so that the orientation direction of the wood flakes was almost at right angles to that of the above-mentioned mixture 1, and the wood flakes were collected so as to have a thickness of 126 mm. Further on top of this, mix 1
Was sprayed so that the orientation direction of the wood flakes was almost at right angles to that of the mixture 2, and the wood flakes were accumulated so that the thickness was 62 mm. The obtained three-layer assembly is subjected to a temperature of 160 ° C.
The laminated wood board of Example 1 was obtained by thermocompression molding at a pressure of 2 MPa for 20 minutes.

Example 2 FIG. 2 shows a laminated wood board of Example 2. This laminated wooden board is formed by laminating sequentially three layers of laminated directional wood flakes 1, 2, 3 so that the orientation directions of adjacent layers are orthogonal to each other. The thickness of this laminated wood board was 12 mm as in Example 1, except that the thickness of both the surface layers of the directional wood flakes laminated plates 1, 3 and the inner layer of the directional wood flakes laminated plate 2 was 4 mm.
Met. That is, the thickness ratio of surface layer: inner layer: surface layer is 1: 1: 1.

This laminated wood board was manufactured as follows. As the mixture 1 and the mixture 2, those similar to those shown in Example 1 were used. This mixture 1 was sprinkled on a hot pressing plate so that the orientation directions of the wood flakes were substantially aligned in one direction, and accumulated so that the thickness became 83 mm. Subsequently, the mixture 2 was sprinkled so that the orientation of the wood flakes was substantially perpendicular to that of the above mixture 1, and the mixture 2 was collected so as to have a thickness of 83 mm. Furthermore, the mixture 1 is subsequently sprinkled thereon so that the orientation of the wood flakes is substantially perpendicular to that of the previous mixture 2, and the thickness is 83
It was collected so as to be mm. The obtained aggregate is heated to a temperature of 1
Example 2 was carried out by thermocompression molding at 60 ° C. and a pressure of 2 MPa for 20 minutes.
The laminated wood board of was obtained.

Example 3 FIG. 3 shows a laminated wood board of Example 3. This laminated wooden board is formed by laminating sequentially three layers of laminated directional wood flakes 1, 2, 3 so that the orientation directions of adjacent layers are orthogonal to each other. The thickness of this laminated wood board was 12 mm as in Examples 1 and 2, except that the thickness of the directional wood thin plate laminated boards 1 and 3 forming both surface layers was 2.4 mm and the directionality forming the inner layer. The thickness of the laminated wood thin plate 2 was 7.2 mm. That is, the thickness ratio of surface layer: inner layer: surface layer is 1: 3: 1.

This laminated wood board was manufactured as follows. As the mixture 1 and the mixture 2, those similar to those shown in Example 1 were used. This mixture 1 was sprayed on a hot pressing plate so that the orientation directions of the thin wood pieces were aligned in almost one direction, and accumulated so that the thickness became 50 mm. Subsequently, the mixture 2 was sprinkled so that the orientation of the wood flakes was substantially perpendicular to that of the mixture 1, and the mixture 2 was collected to a thickness of 150 mm. Further, further, the mixture 1 is sprinkled thereon so that the orientation direction of the wood flakes is substantially perpendicular to that of the previous mixture 2, and the thickness is 5
It was collected so as to be 0 mm. The obtained aggregate was thermocompressed at a temperature of 160 ° C. and a pressure of 2 MPa for 20 minutes to obtain a laminated wood board of Example 3.

With respect to the samples of Examples 1, 2 and 3, the bending strength and bending Young's modulus in each direction were measured with the orientation direction of each surface layer as the X direction and the direction perpendicular thereto as the Y direction. The results are shown in Table 1.

[0027]

[Table 1]

From the results shown in Table 1, when the laminated wood board of Example 1 (thickness ratio 1: 2: 1) is used as a standard, the thicknesses of both surface layers 1 and 3 are the same even if the total thickness is the same. In the case of Example 2 in which the thickness ratio is large (thickness ratio 1: 1: 1), the bending strength in the X direction, which is the orientation direction of the surface layer, is clearly higher than that in Example 1, In the case of Example 3 (thickness ratio 1: 3: 1), since the thickness ratio of both surface layers 1 and 3 is relatively small,
It can be seen that the bending strength in the X direction is smaller than that in Example 1 and the anisotropy is reduced.

(Embodiment 4) FIG. 4 shows a decorative laminated wood board according to Embodiment 4. This decorative laminated wood board was prepared by polishing the surface of one surface layer 1 of the laminated wood board of Example 1, and having a thickness of 0.
It is manufactured by attaching a decorative veneer 4 of 2 mm oak. The surface layer 1 and the decorative veneer 4 were bonded to each other using an aqueous polymer isocyanate-based adhesive (Koyo Sangyo, KR7800) at a temperature of 110 ° C. and a pressure of 10 MPa for 3 minutes.
The surface of the decorative veneer 4 is further polished to a thickness of about 50 μm.
The urethane coating of. The obtained decorative laminated wood board had a smooth and beautiful surface, had a high surface hardness, and had suitable physical properties as a floor board.

Example 5 The decorative laminated wood board of Example 4 was cut into a rectangle of 1800 mm in the X direction and 300 mm in the Y direction, and the back surface had a width of 3 in the direction perpendicular to the orientation direction.
mm, 3 grooves with a depth of 2 mm are formed at 450 mm intervals,
The floorboard of Example 5 was manufactured by making the layer structure of the laminated wooden board asymmetric in the thickness direction. The bending deflection of this floorboard is JAS
It was evaluated based on the standard. That is, this floor board was supported by a span of 700 mm in the X direction, and the displacement (A) when a load of 21 kg weight was applied on a load rod placed orthogonally to the center of the span, and a load of 9 kg weight similarly. The difference (AB) from the displacement (B) when multiplied by was calculated. The smaller this difference is, the higher the rigidity is. According to the JAS standard for floorboards,
The value of this bending deflection needs to be 3.5 mm or less. The floorboard of Example 5 passed this standard.

[0031]

EFFECT OF THE INVENTION Since the laminated wood board of the present invention is a laminate of two or more layers of directional wood flakes laminated so that the orientation directions of adjacent layers are orthogonal to each other, the strength in all directions of the plane is high. It is leveled and bends and warpage are reduced. A suitable bending strength in the longitudinal direction can be obtained by adjusting the strength of the laminated wood board in the surface orientation direction by adjusting the laminated number of the above-mentioned directional timber laminated boards to an odd number of 3 or more and adjusting the thickness ratio of both surface layers and inner layers. A laminated wood board having is obtained. At least one surface of the laminated wood board, by sticking a decorative veneer or base material and decorative veneer, smoothness suitable as a floor board material,
A decorative laminated wood board having an appearance similar to a wooden floor board is obtained. When a floorboard is manufactured using the above decorative laminated wood board, a floor which is smooth and has elasticity suitable for walking can be obtained. Further, if the layer structure of the laminated wood board is made asymmetric in the thickness direction, a floor board without bending, warping or twisting can be obtained. The laminated wood board or decorative laminated wood board of the present invention can be particularly preferably used as a floor board as described above, but as a floor board, a structural surface material, a decorative surface material, a building, a fitting, It goes without saying that it can be widely applied in the fields of furniture, furniture, office equipment, toys and the like.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a laminated wood board of Example 1.

FIG. 2 is a sectional view showing a laminated wooden board of Example 2.

FIG. 3 is a cross-sectional view showing a laminated wooden board of Example 3.

FIG. 4 is a cross-sectional view showing a decorative laminated wood board of Example 4.

FIG. 5 is a sectional view showing an example of a conventional floorboard.

FIG. 6 is a plan view showing a configuration of a directional wood thin plate laminated plate.

[Explanation of symbols]

 1, 2, 3 ... Directional wood thin laminated plate, 4 ... Decorative veneer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location E04F 15/04 7416-2E (72) Inventor Kazushi Endo 10-1 Nakazawa-machi, Hamamatsu-shi, Shizuoka Yamaha Stock Company

Claims (5)

[Claims] 1. A laminated wood board made by laminating two or more directional wood flakes laminated boards, wherein the orientation directions of the directional wood flakes laminated boards in each adjacent layer are orthogonal to each other. 2. The alignment direction of the surface layer according to claim 1, wherein the laminated number of the directional wood thin plate laminate is an odd number of 3 or more, and the thickness ratio between both surface layers and inner layers is changed. Laminated wood board with adjusted directional strength. 3. The method according to claim 2, wherein the sum of the thicknesses of the surface layers is made larger than the sum of the thicknesses of the inner layers, and the strength in the direction along the alignment direction of the surface layers is larger than the strength in the direction along the alignment directions of the inner layer. Laminated wood boards. 4. A decorative laminated wood board in which a decorative veneer or a base material and a decorative veneer are attached to at least one surface of the laminated wood board according to any one of claims 1 to 3. 5. The decorative laminated wood board according to claim 4, wherein the laminated wood board has a layer structure asymmetrical in its thickness direction.