JP3084604B2 - Architectural board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated board used for structural materials, surface covering, interior decoration and furniture of buildings.

[0002]

2. Description of the Related Art Conventionally, as a laminated board, a plywood in which wooden veneers are laminated and bonded with their fiber directions orthogonal to each other, and a parallel plywood (L.
V. L. ) Is known, it can supply a large amount of large-sized boards that cannot be obtained with sawn wood in a large amount, and has excellent dimensional stability. It must not be.

[0003]

However, this plywood is
Due to the laminating and bonding of wood veneers that have been stripped of natural timber, the issue of depletion of natural resources has become a major issue worldwide, making it difficult to cut down the raw wood, which is a raw material, and deteriorating the quality of the raw wood. By doing, it becomes difficult to obtain a large amount of good quality wood veneer used for wood veneer,
It becomes difficult to supply a large quantity of high quality plywood to the market. This problem is expected to become more serious in the future, and there is an eager desire to provide an alternative to plywood.

[0004] Further, there are provided many flooring materials in which decorative veneers are adhered to the surface using such plywood as a substrate, and a heating device such as a hot carpet is placed on this flooring material. In a place where the heating equipment is repeatedly turned on and off, the moisture content in the flooring material changes greatly, and the outermost wooden veneer of the plywood substrate contracts and expands repeatedly, and this wooden veneer and the surface Since the expansion and shrinkage of the decorative veneer veneer adhered to the veneer differs, problems such as cracking of the veneer veneer occur.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been completed as a result of intensive studies for the purpose of providing a new building board which can be used as a substitute for such plywood. That is, the present invention relates to an architectural board in which a plurality of wood veneers 1 are laminated so that the fiber directions of respective wooden veneers 1 adjacent to each other in the thickness direction are orthogonal to each other, and a wood fiber board 2 is laminated on the surface. In the above, at least one of the wooden veneers 1d and 1f having the same fiber direction as the lowermost wooden veneers 1d and 1f, and at least one of the wooden veneers excluding the lowermost wooden veneers 1d and 1f is made of another wooden veneer. It is a building plate characterized by being thicker than a veneer.

[0006] The architectural board of the present invention comprises a plurality of wooden veneers laminated so that their fiber directions are orthogonal to each other.
d, 1f, the lowermost wooden veneer 1d
By setting the thickness of the wood veneer whose fiber direction is parallel to 1f to be thicker than other wood veneers, the bending Young's modulus of the obtained board becomes excellent, and the wood fiber board 2 is further provided on the surface. By arranging, when a decorative veneer such as a veneer is adhered thereon, cracks are less likely to occur in the decorative veneer even after a long-term change in moisture content. Furthermore, the wood fiber board 2
Because of its excellent smoothness, the grain of the decorative material adhered to its surface appears beautifully.

[0007]

【Example】

(Embodiment of the Invention) FIG. 1 is a sectional view of a first embodiment of a building board according to the present invention, in which a back of a wood fiber board 2 is provided with wood veneers 1a, 1b, 1c, 1d. Are laminated and integrated so that their fiber directions are orthogonal to each other between adjacent wooden veneers.

Further, among the veneer veneers excluding the lowermost veneer veneer 1d of the veneer veneer 1, the veneer veneer 1b parallel to the fiber direction of the lowermost veneer veneer 1d is the other veneer. It is arranged so that it is thicker than the thickness of the wooden veneer and the fiber direction is parallel to the longitudinal direction of the plate material.

In the construction plan of FIG. 1, a wooden veneer 1d having the same thickness as the lowermost wooden veneer 1d and other wooden veneers 1a and 1c is laminated. Compared to 1b, the wood veneer is about 1.8 times thicker than the other wood veneers.
1a, 1c, 1d) does not need to use the same one, and different ones cannot be used.

However, the thickness of the wooden veneer in the fiber direction parallel to the fiber direction of the lowermost wooden veneer is 1.3 times that of the thickest wooden veneer among other wooden veneers. By combining them as described above, the lowermost wooden veneer having a high bending Young's modulus parallel to the fiber direction can be obtained.

That is, in the laminated structure of FIG. 1, the architectural plate of FIG. 1 has a higher bending Young's modulus than that of the architectural plate laminated by exchanging the wooden veneers 1b and 1d.

In FIG. 1, the wood fiber board 2 is laminated with the same thickness as the wood veneers 1a, 1c and 1d, but the thickness of the wood fiber board 2 is different from that of other wood veneers. It is preferred to use one that is thinner than any equivalent or other wood veneer.

However, the thickness must be at least 0.7 mm or more. When a wood fiber board thinner than this is used, effects such as prevention of cracking of the veneer when the veneer is adhered to the surface of the building board, and excellent flatness and hardness are not sufficiently obtained.

Further, the building board of the second embodiment shown in FIG.
Six pieces of b, 1c, 1d, 1e, and 1f are laminated and integrated so that their fiber directions are orthogonal to each other between adjacent wooden veneers.

Further, a wooden veneer 1 at the lowermost layer of the wooden veneer 1
f and the wood veneer 2 excluding the wood veneer 2, among the wood veneers 1 b and 1 d in the fiber direction parallel to the fiber direction of the lowermost wood veneer 1 f, the wood veneer 1 b is another wood veneer. And the fiber direction is parallel to the longitudinal direction of the plate material. Further, in the laminated structure of FIG.
Not only two sheets including 1d but also 1d can be similarly thicker than other wooden veneers.

The wood fiber board 2 of the present invention can be used, for example, having a thickness of about 0.7 to 5 mm, such as softwood such as pine, cedar, cypress, or rawan, kapole, chestnut. , A medium density fiber board and a hard fiber board obtained by compression-molding a wood fiber obtained by defibrating a raw wood of hardwood such as poplar, or a wood chip obtained by cutting waste wood by a conventional method by a dry method. .

Above all, a specific gravity of 0.45 having a hard layer on both sides
Wood fiberboard in the range of 0.95 is preferred. Such a wood fiber board alone has excellent stability in that the dimensional change rate per 1% of water content is equal in the longitudinal direction and the transverse direction and is 0.03 to 0.04%, and the surface smoothness is also high. It is excellent.

Further, a wood fiber board obtained by a wet method,
The wood fiber board having a hard layer (black rock layer) having a significantly higher specific gravity than the other parts in the vicinity of the front and back due to the movement of moisture during the heating and pressing and the amount of adhesive applied to the wood fiber, etc. It is preferable to use the hard layer by sanding so that the hard layer is exposed on the front and back surfaces.

This hard layer increases the bending Young's modulus of the wood fiber board 2 and increases the hardness of the building board surface.
It has the property that it is hard to be dented even if it is locally overloaded by a falling ball test on a building plate surface, high heels, casters, or the like.

The wood veneer 1 has a thickness of, for example, about 0.5 to 5 mm, and may be a hardwood veneer or a softwood veneer which has been widely used in conventional plywood. In addition, all the woody veneers can be composed of only a softwood veneer or only a hardwood veneer, but a mixture of a softwood veneer and a hardwood veneer can also be used.

These wooden veneers consist of four, five, six, seven
The sheets and the even or odd sheets are laminated and integrated so that the fiber directions are orthogonal to each other between each adjacent wood veneer.

Further, in the present invention, among the wood veneers excluding the lowermost wood veneer, the thickness of the wood veneer having a fiber direction parallel to the fiber direction of the lowermost wood veneer is determined by the other wood veneer. Although it is configured to be thicker than the thickness of the planks, a wood veneer having a thickness at least 1.3 times or more that of other thick wooden veneers is used.

Further, the thick wooden veneer is a wooden veneer excluding the lowermost layer, and is disposed at a position parallel to the fiber direction of the lowermost wooden veneer, whereby the laminated wooden veneer is integrated. The bending Young's modulus is improved.

In particular, since the bending Young's modulus in the longitudinal direction of the architectural plate is required, it is preferable to arrange the plate so as to be parallel to the longitudinal direction of the architectural plate. The wood fiber board 2 and the wood veneer 1 are attached via a thermosetting resin-based adhesive or a thermoplastic resin-based adhesive.

Further, a decorative sheet can be adhered to the surface of the wood fiber board 2 of the architectural board of the present invention, if necessary.
As a decorative sheet, a natural veneer obtained by cutting natural wood, an artificial veneer, a nonwoven fabric, paper, a veneer sheet lined with a synthetic resin sheet, or a decorative paper of 20 to 40 g / m ^2, a decorative paper of 32 to 500 g / m ² An overcoating step may be provided after pattern printing or single-color coating such as nonwoven fabric, 50 g / m ² parchment paper, or a decorative sheet is adhered.

For bonding these decorative sheets, it is possible to use a thermoplastic adhesive such as vinyl acetate resin mixed with a thermosetting resin or urea powder for improving water resistance. In addition, even when a decorative veneer is stuck, the architectural plate of the present invention can be used as a decorative veneer due to the property that the surface wood fiber board 2 on the surface of the architectural plate has excellent smoothness and shrinkage and expansion due to moisture absorption and desorption is small. No cracks occur.

[0027]

The architectural board according to the present invention is obtained by combining a wood veneer used for a conventional plywood with a wood fiber board 2. The wood fiber board 2 has a disadvantage that it cannot be used as a wood veneer. Can be obtained by using a small crushed or defibrated material, so that resources can be effectively used and natural destruction can be prevented.

Further, of the plurality of wooden veneers laminated so that their fiber directions are orthogonal to each other, the fiber direction is parallel to the lowermost wooden veneers 1d and 1f among the wooden veneers excluding the lowermost wooden veneer. By making the thickness of the wood veneer thicker than the other wood veneers, the obtained plate material has excellent bending Young's modulus, and furthermore, by disposing the wood fiber board 2 on the surface, When a decorative veneer such as a veneer is stuck thereon, the decorative veneer is less likely to crack even after a long-term change in moisture content. Furthermore, since the smoothness of the wood fiber board 2 is excellent, the grain of the decorative material adhered to the surface thereof appears beautifully.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment,

FIG. 2 is a sectional view of a second embodiment,

[Explanation of symbols]

1, 1a, 1b, 1c, 1d, 1e, 1f: wood veneer,
2: Wood fiber board.

Claims (4)

(57) [Claims] 1. A building board in which a plurality of wood veneers are laminated such that the fiber directions of respective adjacent wood veneers are orthogonal to each other in the thickness direction, and the wood fiber veneers are laminated on the surface. The veneer veneer has the same fiber direction as the bottom veneer veneer, and at least one of the veneer veneers excluding the bottom veneer veneer is thicker than the other veneer veneers. An architectural plate characterized in that: 2. The architectural board according to claim 1, wherein the fiber direction of the lowermost wooden veneer is parallel to the longitudinal direction of the architectural board. 3. The building board according to claim 1, wherein the thickness of the wood veneer that is thicker than that of the other wood veneers is at least 1.3 times the thickness of the other wood veneers. 4. The building board according to claim 1, wherein the wood fiber board is made thinner than a wood veneer thicker than other wood veneers.