JPH11240001A - Wood composite board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wood composite board which is best suited as a flooring almost free from a recessed warping toward both ends of the flooring from the center part of its longitudinal direction and displays outstanding application properties. SOLUTION: A wood fiber board material 2 with a thickness of 0.5-2.0 mm and a specific gravity of 0.6-1.0 is applied to the front face side of a plywood base material 1 composed of a plurality of lumber veneers laminated adhesively to impart an appropriate rigidity to the surface of the plywood base material 1. At the same time, the generation of a recessed warping is suppressed by forming the wood fiber board material 2 thinly. Further, the fitting properties of the plywood base material 1 with a floor ground material are upgraded by applying a thin veneer 3 of conifer to the back face of the plywood base material 1. In addition, the trend of a projecting warpage is generated on the plywood base material 1 by the contracting force of the thin lumber veneer 3, so that the application properties are improved when the plywood base material 1 is fixedly nailed. Besides, the fiber direction of the wood veneers on both front and back face sides of the plywood base material 1 is made pliable widthwise.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a building interior material such as a flooring material for a house, a step board, a skirting board and the like, a table, and the like.
The present invention relates to a material for furniture such as a countertop, and more particularly to a wood composite board suitable for use as a flooring material, which hardly generates concave warpage in the length direction.

[0002]

2. Description of the Related Art Conventionally, a decorative sheet such as a veneer or printing paper is stuck on the surface of a substrate made of a wood material such as plywood, and a surface decorative layer is provided by applying a clear coating or a colored clear coating on the surface. Such decorative panels are widely used as flooring and wall materials for buildings such as houses, or as materials for furniture. However, for example, when a veneer is applied to the surface of a plywood and then painted and used as a floor material, a small hole, a missing node, a defective portion, such as a joint, present in the wood substrate is a veneer. Appearance on the surface, and the expansion and contraction of the plywood due to absorption and diffusion of moisture causes fine cracks (dry cracks) on the veneer on the surface, which significantly impairs the cosmetic properties. When used as a product, if a local load is applied to the surface due to heavy furniture legs or falling objects, dents may occur, or the surface of the decorative panel may be damaged by the sliding load of a wagon with casters. There is a problem.

[0003] Therefore, a relatively thin wood fiber board such as a medium-density wood fiber board is adhered to the surface of the plywood to form a composite board, and a veneer or a synthetic resin-made decorative board is formed on the surface of the wood board. A decorative sheet such as a sheet or printed paper is adhered, or a decorative board having a surface decorative layer formed by painting or the like is used as a flooring material. The prevention of accompanying cracks has been carried out.

[0004]

However, when a composite board is formed by attaching a wood fiber board to the surface of a plywood, a difference in the shrinkage ratio and directionality between the plywood and the wood fiber board results in a veneer board. Concave warpage is likely to occur in the longitudinal direction. The occurrence of such concave warpage remains even when formed on a decorative panel, and when this decorative panel is applied to a floor material or the like, both ends are lifted upward with respect to the central portion in the longitudinal direction, Not only is it difficult to fix both ends with nails or an adhesive, but also there is a problem that a step or poor fixation occurs at the butted ends of adjacent floor materials.

The present invention has been made in view of such a problem, and an object of the present invention is to suppress longitudinal warpage in a longitudinal direction even though a wood fiber board is used. It is an object of the present invention to provide a wood composite board that exhibits dimensional stability, is excellent in strength, has good compatibility with floor base materials, and exhibits excellent workability.

[0006]

In order to achieve the above object, a wood composite board according to claim 1 of the present invention has at least 3
The thickness is 0.000 on the surface of a rectangular plywood substrate formed by laminating and bonding two or more wood veneers sequentially with their wood fiber directions orthogonal.
A conifer with a wood fiber plate material of 5 to 2.0 mm and a specific gravity of 0.6 to 1.0 stuck on the back surface of the plywood substrate, with a thickness equal to or less than the thickness of the wood fiber plate material and a specific gravity of 0.5 or less. Is bonded to a veneer veneer on the back side of a plywood substrate with its wood fiber direction orthogonal.

[0007] In the wooden composite board thus configured,
The invention according to claim 2 is characterized in that the wood fiber board is obtained by dividing a wood fiber board having a specific gravity of 0.6 to 1.0 from the center in the thickness direction thereof,
The invention according to claim 3 is characterized in that the wood fiber direction of the front and back timber veneers forming the front and back surfaces of the plywood substrate plate material is oriented in the width direction.

[0008]

The surface layer side of the plywood board is subjected to a contraction force in the length direction by the wood fiber board attached to the surface of the plywood board formed by laminating and bonding a plurality of wood veneers. Is from 0.5 to 2.0 mm, which is extremely thin, so that it is possible to reduce so-called concave warpage in which the plywood substrate curves upward from the center in the length direction toward both ends. Further, since the wood fiber board is formed to have a relatively high specific gravity of 0.6 to 1.0, sufficient hardness is imparted to the surface of the wood composite board to which the wood fiber board is attached. When it is used as a floorboard, even if it receives a sliding load from a wagon caster or a local load from the legs of a piano, the surface decorative layer is unlikely to dent or scratch, and the wood fiber board itself also Delamination hardly occurs.

On the other hand, a wood veneer made of softwood having a thickness equal to or less than the thickness of the wood fiber board and a specific gravity of 0.5 or less is provided on the back of the plywood substrate with respect to the wood veneer on the back of the plywood substrate. Since the wood fibers are stuck in a perpendicular direction, not only does it make it difficult for the wood composite board to be concavely warped due to the sticking of the wood fiber board to the surface of the plywood board, but it also tends to be moderately convex. Can be

[0010] In addition, since the wood veneer made of softwood having a specific gravity of 0.5 is lightweight and has low rigidity, a decorative layer is provided on the plywood substrate to which the wood veneer is adhered via the wood fiber board. In the case of a decorative veneer, even if the decorative veneer has some convex warpage, the softness of the softwood timber veneer improves the familiarity with the floor base material and creates a step between adjacent decorative veneers. It is possible to work flat with a nail or an adhesive without making it work. In addition, by setting the fiber direction of the wood veneer arranged on the front and back of the plywood substrate in the width direction orthogonal to the length direction of the wood composite board as described in claim 3, a more favorable wood composite board is obtained. Flexibility and conformability can be provided.

The wood fiber board to be attached to the surface of the plywood substrate is as thin as 0.5 to 2.0 mm, and it is difficult to manufacture such a wood fiber board.
A wood fiber board having an appropriate thickness can be easily manufactured by dividing the wood fiber board into two parts from the center in the thickness direction.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 1, a wood composite board A is composed of a plywood board 1 having a desired thickness, and a plywood board 1 having a desired thickness. A wood fiber board 2 made of a medium-density wood fiber board having a thickness of 0.5 to 2.0 mm and a specific gravity of 0.6 to 1.0, which is laminated and adhered to the surface, and a thickness adhered to the back surface of the plywood substrate 1 The thickness is equal to or less than the thickness of the wood fiber board 2 and the specific gravity is 0.5
And a wood veneer 3 made of the following softwood.
The wood composite board A is formed in a planar rectangular shape, and the wood veneer 3 made of softwood stuck to the back surface of the plywood board 1 has its fiber direction oriented in the width direction orthogonal to the length direction of the plywood board 1. And glued.

The number of laminated wood veneers constituting the plywood substrate 1 is usually 5 plies as shown in FIG.
Although a three-ply or seven-ply structure as shown in FIG. 2 is used, the plywood substrate is formed by laminating an odd number of wood veneers of three or more plies in a state where their wood fiber directions are orthogonal to each other. 1 may be configured. Further, in a plurality of wood veneers constituting the plywood substrate 1, the wood fiber directions of the front and back sides, that is, the wood veneers 1a and 1b forming the uppermost layer and the lowermost layer of the plywood substrate 1 are shown. It is desirable to face the plywood substrate 1 in the width direction as shown in FIG.
Therefore, when the plywood substrate 1 is composed of five plies, as shown in FIG. 1, the wood veneer 1c at the center also has its wood fiber direction oriented in the width direction and the second and fourth layers. The wood veneers 1d and 1e have their wood fiber directions oriented in the length direction, and when composed of three plies, as shown in FIG. 2, these front and back wood veneers 1a and 1b Only the central wood veneer 1f sandwiched between the two has its wood fiber direction oriented in the length direction.

As described above, the flexibility and flexibility of the wood composite board A are improved by directing the wood fiber directions of the front and back wood veneers 1a and 1b in the width direction orthogonal to the length direction of the plywood substrate 1. However, when a decorative layer is applied to the surface of the wooden composite board A and applied to the floorboard, the adaptability to the floor base surface is improved, and the effect of smoothly and reliably performing nailing to the floor base material and fixing with the adhesive can be obtained. Play. The kind and thickness of the wood veneer constituting the plywood substrate 1 are not particularly limited. In addition, a thin sheet of wood, plastic, or foamed plastic that does not significantly affect the warpage of the wood composite board A may be interposed on the overlapping surfaces of the wood veneers.

When the thickness of the wood fiber board 2 attached to the surface of the plywood substrate 1 is less than 0.5 mm, the wood board becomes too thin and the surface hardness of the wood composite board A is reduced, so that the wood composite board A is easily damaged. If the thickness is 2 mm or more, the difference in shrinkage ratio from the wood substrate 1 becomes large, and the wood composite board A is likely to be warped.
It is formed to a thickness of about 0.5 to 2.0 mm, preferably about 0.8 to 1.6 mm.

Further, the specific gravity of the wood fiber board 2 is 0.1
When it is less than 6, the strength such as hardness and rigidity of the wood composite board A decreases, and delamination tends to occur in the wood fiber board 2. On the other hand, when it exceeds 1.0, the rigidity becomes too high and the wood composite board becomes too high. A is liable to generate concave warpage and is hard, so that workability such as cutting is deteriorated and the tactile sensation as a wooden material is reduced. Therefore, as described above, the specific gravity is 0.6 to 1.0, preferably 0.6 to 1.0, and more preferably 0.6 to 1.0. A wood fiber board 2 of about 0.65 to 0.85 is used. It should be noted that the specific gravity referred to in the present invention is an air-dry specific gravity which is generally and often used.

When the thick wood fiber board 2 is adhered to the surface of the plywood substrate 1, the wood composite board A is moved from the center to both ends in the length direction due to the curing of the adhesive and shrinkage of the wood fiber board 2. A so-called concave warpage that warps upward occurs. Although this concave warpage is reduced by laminating and bonding the thin wood fiber board 2 having a thickness of 0.5 to 2.0 mm as described above, it is difficult to obtain such a thin wood fiber board 2. It is.

Therefore, in order to obtain a thin wood fiber board having a thickness of 2.0 or less, sanding a wood fiber board having a thickness of 2.5 mm or more, which is easily available, can be considered. In addition, in the present invention, a commercially available wood fiber board having a specific gravity of 0.6 to 1.0 is used as the wood fiber board 2 from the center in the thickness direction. The one formed by dividing into two is used. In this case, 2
Since the divided medium-density wood fiber board can be further sanded as required to reduce the thickness to a desired thickness, the productivity and the yield of the material are improved, and the sanding process is performed after being divided into two. The workability is also good, and the wood composite board A having a convex warpage can be efficiently formed by laminating and bonding this thin wood fiber board 2 onto the plywood substrate 1.

On the other hand, as the wood veneer 3 made of softwood stuck to the back surface of the plywood substrate 1, if the thickness is too large, the wood composite board A tends to become rigid and the convex warpage tends to increase. Therefore, it is preferable that the thickness is about 1 to 1/2 of the thickness of the wood fiber board 2 because the compatibility with the floor base material is deteriorated and the original physical properties are impaired even if the thickness is too thin. . Further, when the specific gravity of the wood veneer 3 exceeds 0.5, the rigidity is increased and the above-described problem occurs, and when the specific gravity is 0.3 or less, the effect is reduced.
A wood veneer 3 having a specific gravity of 0.5 is used. In addition, the wood veneer made of softwood is softer than the wood veneer made of hardwood, and has stiff physical properties. Therefore, in order to achieve the object of the present invention, the use of hardwood veneer is not preferable.

Further, the wood veneer 3 made of this coniferous tree has its fiber direction orthogonal to the fiber direction of the back side veneer veneer 1b forming the lowermost layer of the plywood substrate 1, that is, the wood composite. Orients in the length direction of the board. Examples of such softwood veneers include, but are not limited to, wood veneers made of softwood such as Pinus densiflora, Scots pine, Radiata pine, Spruce and Spruce.

As an adhesive for attaching the wood fiber board 2 and the wood veneer 3 made of softwood to the front and back surfaces of the plywood substrate 1, respectively, a thermosetting resin such as a urea resin, a melamine resin or a phenol resin is used. Agent, a vinyl urethane resin adhesive, a modified vinyl acetate resin adhesive, and the like.

Although there is no particular limitation on the method for manufacturing the wooden composite board A having such a configuration, it can be generally manufactured by the following three methods. . As the plywood substrate 1, a plywood which is laminated and bonded in advance is used, and a wood fiber board 2 and a wood veneer 3 made of softwood are respectively bonded to the front and back surfaces of the plywood via an adhesive to thereby provide a wood composite board. A method for forming A. . When the plywood substrate 1 is formed by laminating and bonding a plurality of wood veneers through an adhesive in order so that the wood fiber directions of the front and back wood veneers are oriented in the width direction, Wood veneer 3 made of softwood with its fiber direction oriented in a direction orthogonal to the fiber direction of the (lowest layer) wood veneer
And bonding them together with an adhesive, and then bonding the wood fiber board 2 to the wood veneer on the surface (top layer) via an adhesive to form the wood composite board A. . A plurality of wood veneers for forming the plywood substrate 1 on a wood veneer 3 made of softwood and a wood fiber board 3 are sequentially laminated via an adhesive, and are simultaneously integrated by hot pressing to produce a wood composite board. A method for forming A.

After attaching printing paper or veneer to the surface of the wooden composite board A obtained as described above, applying a decorative layer (not shown) by painting the surface with a clear synthetic resin paint, A decorative board can be obtained. The decorative layer may be formed by attaching a veneer impregnated with resin to the surface of the wooden composite board A, or may be formed by attaching a decorative sheet. Next, specific examples of the present invention will be described.

[Example 1] A veneer veneer having a thickness of 1.2 mm with the wood fiber direction oriented in the width direction was used as a back layer plate, and the wood fiber directions were alternately substantially orthogonal to the wood veneer. After laminating wood veneers having a thickness of 2.4 mm, 3.0 mm, 2.4 mm, and 1.2 mm through an adhesive, they are hot-pressed to form a 5-ply laminated plywood. The surface was sanded to obtain a plywood substrate having a thickness of 9.4 mm. In addition,
All wood veneers are formed in a rectangular shape with a width of 950mm and a length of 1850mm.

On the other hand, a wood fiber board having a specific gravity of 0.74 and a thickness of 2.7 mm is vertically divided into two parts from the center in the thickness direction to produce a wood fiber board having a thickness of 1.35 mm. This wood fiber board is laminated on the surface of the plywood substrate via a urea-melamine resin adhesive, and the thickness of the wood fiber is oriented in the length direction on the back surface of the plywood substrate via the urea-melamine resin adhesive. After stacking softwood veneers made of radiata pine with a thickness of 1.2 mm and an air-dry specific gravity of 0.41,
The pieces were integrated by hot-press bonding using a hot press, and then the softwood veneer on the back side was sanded to obtain a 10.8 mm thick wood composite board. The wood composite board had a slightly convex shape from the center toward both ends in the length direction.

The surface of the wooden composite board thus obtained was 0.25
When a decorative veneer was prepared by hot-press bonding a sliced veneer made of oak wood having a thickness of mm via a urea-melamine resin adhesive by hot pressing, no concave warpage was generated on the decorative veneer.

[Embodiment 2] The same as the embodiment 1.35 in order from the top.
a wood fiber board with a thickness of mm, a veneer with a thickness of 3.0 mm with the wood fiber direction in the width direction, and a core veneer with a thickness of 4.0 mm with the wood fiber direction in the length direction. A veneer veneer with a thickness of 3.0 mm with the direction of the wood fiber oriented in the width direction, and a radiator pine having a thickness of 1.2 mm with the wood fiber direction oriented in the length direction as in Example 1 and an air-dry specific gravity of 0.41 3 layers of plywood by successively laminating a softwood veneer consisting of A wood composite board obtained by sticking a wood fiber board on the surface of the above and a softwood veneer made of radiata pine on the back. This wood composite board had almost no concave warpage as in Example 1, and a veneer was prepared by attaching a sliced veneer to its surface. No concave warpage occurred.

[Embodiment 3] The same as Embodiment 1 in order from the top 1.
A 35 mm thick wood fiber board, a first wood veneer 1.2 mm thick with the wood fiber direction in the width direction and a second wood veneer 2.4 mm thick with the wood fiber direction in the length direction A single wood veneer, a third wood veneer having a thickness of 3.0 mm with the wood fiber direction in the width direction, and a fourth wood veneer having the same thickness in the same fiber direction as the second wood veneer A veneer, a fifth veneer veneer having the same fiber direction and the same thickness as the first veneer veneer, and a softwood veneer having a thickness of 1.2 mm comprising a radiator pine whose fiber direction is oriented in the length direction. Are sequentially laminated via an adhesive made of urea-melamine resin between the respective laminating surfaces, and this laminated plate is bonded by hot-pressing with a hot press and integrated to form a wood fiber on the surface of a 5-ply plywood. A wood composite board obtained by sticking a softwood veneer made of radiata pine on the back surface of the board material was obtained. Also in this wood composite board, almost no concave warpage occurred similarly to the wood composite board of Example 1, and a veneer was prepared by sticking a sliced veneer to the surface as in the example. This decorative plate also had a good appearance without concave warpage.

Comparative Example A wood composite board was prepared in the same manner as in Examples 1 to 3, except that the softwood veneer on the back side was otherwise the same as in each of the above Examples except for the structure and the manufacturing method. Each of the wood composite boards of this comparative example has a concave warp, and a decorative veneer is produced by sticking the same sliced veneer as in each example to the surface of this wood composite board, but the concave warp is eliminated. Had not been.

[0030]

As described above, according to the wood-based composite board of the present invention, at least three or more wood veneers are laminated and adhered in such a manner that their wood fiber directions are orthogonal to each other, and are attached to the surface of a rectangular plywood board. A wood fiber board having a thickness of 0.5 to 2.0 mm and a specific gravity of 0.6 to 1.0 is adhered, and the thickness is equal to or less than the thickness of the wood fiber board on the back surface of the plywood substrate and the specific gravity is 0.5. A wood veneer made of the following softwood is attached to the veneer board on the back of the plywood board with the wood fiber direction orthogonal to the wood veneer. Since the thickness of the plywood substrate is extremely thin, that is, 0.5 to 2.0 mm, it is possible to reduce so-called concave warpage in which the plywood substrate is curved upward from the center in the length direction toward both ends. Decorative board as flooring with decorative layer provided on the surface of wood composite board When prepared, it may be applied a floor structure exhibiting an excellent appearance such as a step does not occur in conjunction with enabling and accurately easily workability by nails fusion or the like for the underfloor member.

Further, the above wood fiber board has a specific gravity.
Since it is formed with a relatively high specific gravity of 0.6 to 1.0, it can provide sufficient hardness to the surface of the wood composite board. Even if a local load is applied from the legs or the like, the surface decorative layer is hardly dented or scratched, and the wood fiber board itself is hardly delaminated, so that a floor structure that can withstand long-term use can be obtained.

A veneer made of softwood having a thickness equal to or less than the thickness of the wood fiber board and having a specific gravity of 0.5 or less is provided on the back of the plywood substrate with respect to the wood veneer on the back of the plywood substrate. Since the wood fibers are stuck in a perpendicular direction, this wood veneer can be used only to make it difficult for the wood composite board to be concavely warped due to the sticking of the wood fiber board to the surface of the plywood board. Rather, it can have an appropriate convex warpage tendency, and when used as a floor plate, both ends in the length direction do not float up, making it possible to easily and accurately attach with nails or an adhesive.

In addition, since the wood veneer made of softwood having a specific gravity of 0.5 is lightweight and has low rigidity, a decorative layer is provided on a plywood substrate having the wood veneer adhered to the back surface thereof through the wood fiber board material. When a decorative veneer is constructed, even if the decorative veneer has some convex warpage, the softness of the softwood veneer makes the familiarity with the floor base material etc. good, and the step between the adjacent decorative veneers is improved. It can be flattened with nails or adhesives without causing it.

According to the second aspect of the present invention, the wood fiber board is formed by dividing a wood fiber board having a specific gravity of 0.6 to 1.0 into two parts from the center in the thickness direction. In addition, a thin wood fiber board having no risk of causing concave warpage in the wood composite board can be easily manufactured with good yield.

Further, according to the third aspect of the present invention, since the wood fiber direction of the front and back timber veneers forming the front and back surfaces of the plywood substrate is oriented in the width direction, the wood composite board is more favorable. Adaptability can be imparted.

[Brief description of the drawings]

FIG. 1 is a partially enlarged simplified vertical cross-sectional view of a wooden composite board using a 5-ply plywood substrate;

FIG. 2 is a partially enlarged simplified longitudinal sectional view of a wooden composite board using a 3-ply plywood substrate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plywood board 1a-1f Wood veneer 2 Wood fiber board 3 Wood veneer made of softwood

Claims (3)

[Claims] 1. A rectangular plywood substrate formed by laminating and bonding at least three or more wood veneers sequentially with their wood fiber directions perpendicular to each other, and having a thickness of 0.5 to 2.0 mm and a specific gravity of 0.6 to 2.0.
A wood veneer made of softwood having a thickness of equal to or less than the thickness of the wood fiber board and having a specific gravity of 0.5 or less is attached to the back of the plywood board with the wood fiber board of 1.0 attached to the back of the plywood board. A wood composite board characterized by being attached to a back veneer veneer with its wood fiber direction orthogonal. 2. The wood fiber board has a specific gravity of 0.6 to 1.
2. The wood composite board according to claim 1, wherein the wood composite board is obtained by dividing the wood fiber board of No. 0 into two parts from the center in the thickness direction. 3. The wood composite board according to claim 1, wherein the wood fiber direction of the front and back wood veneers forming the front and back surfaces of the plywood substrate is oriented in the width direction.