JP2595439B2 - Decorative 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 decorative board, and more particularly to a decorative board in which an arbitrary decorative sheet is adhered to a surface of a substrate made of a medium-density fiberboard.

[0002]

2. Description of the Related Art Medium specific gravity fiberboard has a specific gravity of 0.4 to 0.8.
However, since it is relatively lightweight, it has excellent strength properties and good workability, it is used as a building material after being subjected to optional makeup as required.

[0003] In the case of the medium specific gravity fiberboard, for example, when a dry method is used, an adhesive is applied to wood fibers obtained by defibrating hardwood or softwood, and this is formed and temporarily pressed to form a fiber mat. It is obtained by cutting a fiber mat into a fixed size to obtain a fixed-size mat, and then heating and pressing.

[0004]

The medium-density fiberboard has a weak surface and is porous because it forms a plate-like body by entanglement of wood fibers and solidification of an adhesive. Therefore, when a decorative sheet is adhered to the surface of a medium-density fiberboard via an adhesive, there is a defect that sufficient adhesive strength cannot be obtained and delamination tends to occur.

An object of the present invention is to solve the above-mentioned drawbacks and to provide a decorative board having an improved adhesive strength to a decorative sheet.

[0006]

Means for Solving the Problems The present invention, which has been devised in order to achieve the above object, has an overall specific gravity of 0.4.
0.8 to at least a hard layer with high specific gravity on the surface
A medium-density fiberboard provided with a thickness of 0.3 to 0.5 mm is used as a substrate, a decorative sheet is stuck on the hard layer via an adhesive, and a coating film of a topcoating transparent paint is applied on the surface thereof. It is a decorative plate characterized by forming a layer.

The medium specific gravity fiberboard has an overall specific gravity of 0.4 to 0.8.
Although it is excellent in light weight, workability, and handleability, a hard layer having a high specific gravity is exposed on one or both surfaces.
This hard layer has a specific gravity of 0.8 to 1.4,
It has a layer thickness of about 0.5 mm.

As described above, for example, in the process of manufacturing a wood fiber board by a dry method, the medium specific gravity fiber board is added with an adhesive or the like, and the dried wood fiber is deposited on a screen conveyor by a forming device. Then, the wood fiber mat is temporarily pressed to obtain a wood fiber mat, and then cut to a certain size to obtain a fixed-length wood fiber mat, which is obtained by heating and pressing. By increasing the amount of added or increasing the water content of the wood fiber, the thickness of the hard layer on one or both sides can be increased.

Further, water is applied to the upper or lower surface of the fixed-length wood fiber mat, or a water-retaining sheet-like material such as non-woven fabric, paper or cloth is impregnated with water on the upper or lower surface of the wood fiber mat. By mounting and heating in this state, it is heated and pressed in a state where the water content of the front and back portions is increased, so that it is formed on the water application surface or the mounting surface side of the sheet-like material. The hard layer has a large layer thickness.

In this way, a medium-density fiberboard having a hard layer having a predetermined thickness on one or both sides is obtained.

In the obtained medium specific gravity fiberboard, a low specific gravity thin surface layer is formed by pre-curing of the adhesive at the time of heating and pressing, so that at least the surface side is sanded to remove the low specific gravity thin surface layer. Exposing the hard layer.

The hard layer having a high specific gravity formed on at least the surface of the medium-density fiberboard is optionally subjected to a sealer treatment,
After a base treatment such as a coloring treatment is performed to strengthen and color the material, an adhesive is applied.

The adhesive used at this time includes vinyl acetate resin, ethylene vinyl acetate resin, epoxy resin,
Thermosetting or thermoplastic adhesives such as urea resin, melamine resin, phenol resin, isocyanate, acrylic resin, urethane resin and the like are used.

The adhesive contains one or more chemicals such as an aromatic, a deodorant, an insect repellent, a pest repellent, etc., composed of natural essential oils, synthetic fragrances and the like.
One or more species can be added. Thereby, a decorative board having required effects such as a forest bathing effect, an aroma effect, a deodorizing effect, an insect repellent effect, a pest repellent effect, and a bactericidal effect is obtained. These drugs may be added directly as they are, or may be added in an emulsified or microencapsulated state.

A decorative sheet is placed on the surface of the substrate on which the adhesive is to be applied, and pressure-bonded using a laminating apparatus, a flat plate press or the like.

The decorative sheet may be a veneer, an artificial veneer, a backing of which is adhered to a backing material such as Japanese paper, paper, non-woven fabric, cold gauze, or the like. Decorative paper on which any colored coating is applied or any pattern is printed and formed,
A decorative impregnated paper, a decorative synthetic resin sheet, or the like is selected and used depending on the use as a decorative plate.

A colorless transparent or colored transparent overcoating transparent paint is applied to the surface of the decorative sheet attached to form a coating layer.

Mineral particles are added to and mixed with the top transparent paint. The mineral particles include silicon carbide, aluminum oxide, silicon oxide, borax, boron carbide and the like having a particle diameter of 10 to 200 μm, and preferably have a new Mohs hardness of 10 or more. The addition amount of the mineral particles is preferably set to 10 to 95% based on the solid content (non-volatile component) of the coating resin.

As the mineral particles, plural kinds having different particle diameters may be added and mixed. For example, it is possible to add 10 to 50 μm of aluminum oxide powder as fine mineral particles and 50 to 150 μm of silicon carbide powder as coarse mineral particles. The addition of the coarse particles and the fine particles of the fine particles having different particle diameters as described above enhances the fluidity of the coating by the addition of the fine particles and is uniformly dispersed, so that the wear resistance can be improved. In addition, since the bearing effect of the fine particles in the coating material improves the dispersibility and sedimentation prevention of the coarse particles, the coarse particles are also uniformly dispersed, and the long-term wear resistance can be improved.

As the overcoating transparent coating, a synthetic resin coating such as an aminoalkyd resin coating, a vinyl resin coating, an acrylic resin coating, an epoxy resin coating, a polyurethane resin coating or an unsaturated polyester resin coating is generally used.

Further, an ultraviolet-curable resin coating may be used as the top coating transparent coating. UV-curable resin coatings cure in a short time, are solvent-free, do not cause air pollution, are one-pack, and are easy to handle. It has the effect of preventing the occurrence of warpage of the decorative board without affecting it.

One or more kinds of chemicals such as a fragrance composed of natural essential oils and synthetic fragrances, deodorants, insect repellents, pest repellents and the like can be added to the top transparent paint. Thereby, a decorative board having required effects such as a forest bathing effect, an aroma effect, a deodorizing effect, an insect repellent effect, a pest repellent effect, and a bactericidal effect is obtained. These drugs may be added directly as they are, or may be added in an emulsified or microencapsulated state.

In the formation of the wear-resistant coating film layer, when a solvent-type overcoating transparent paint is used, the volume of the solvent is reduced due to the scattering of the solvent into the atmosphere at the time of impression curing, and as a result, mineral particles are reduced. The coating layer may be cured while projecting from the coating layer. In this case, roughness occurs on the surface,
The occurrence of a matte state is observed, which is not preferable. Therefore, it is desirable to form a wear-resistant coating layer by applying a top-coating transparent coating containing mineral particles, and then apply a transparent coating to the surface to form a protective coating layer,
This gives a smooth and glossy decorative surface.

Further, abrasion resistance can be imparted by adding and mixing mineral particles into the transparent coating material for forming the protective coating layer. In this case, it is preferable that the mineral particles have a particle diameter smaller than that of the mineral particles contained in the top-coating transparent paint, and the surface roughness and matte state are suppressed.

As described above, a medium specific gravity fiberboard provided with a hard layer having a high specific gravity at least on its surface is used as a substrate, and a decorative sheet is pasted on the hard layer via an adhesive. The decorative plate of the present invention is obtained by forming a coating layer of a transparent top coating on the surface.

[0026]

Since the decorative sheet is adhered to the hard layer having a high specific gravity on the surface of the substrate made of the medium specific gravity fiberboard via the adhesive through the adhesive, the adhesive may be sucked into the substrate surface more than necessary. In addition, a proper anchoring effect can be obtained, and a sufficient adhesive force can be obtained.

[0027]

FIG. 1 shows an example of the construction of a decorative board according to the present invention, in which a medium specific gravity fiber board 1 is used as a substrate, an adhesive layer 3 and an optional decorative sheet on a hard layer 2 having a high specific gravity on the surface thereof. 4 and a coating layer 5 made of an overcoated transparent paint are sequentially laminated.

[0028]

According to the present invention, it is possible to obtain a decorative plate which does not cause delamination between the decorative sheet and the decorative sheet.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration example of a decorative board according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Medium specific gravity fiber board (substrate) 2 Hard layer 3 Adhesive layer 4 Optional decorative sheet material 5 Coating layer

Claims (1)

(57) [Claims] 1. A hard layer having a specific gravity of at least 0.4 to 0.8 and having a high specific gravity on its surface at a thickness of 0.3 to 0.5 mm.
Specific gravity fiberboard and substrate in provided, characterized in that via the adhesive on the rigid layer adhered to the decorative sheet, by forming a further coating layer by topcoating clearcoat on its surface And decorative board.