JP2002355940A - Decorative board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative board having a structure which can simply remove a decorative sheet and in which a waste material can be easily fractionated, and to provide a decorative board in which a base after the decorative sheet is removed can be recycled by a simple method. SOLUTION: The decorative board is formed by forming a release layer 4 containing a foaming agent 2 and a resin 3 on the base 1, then further forming an adhesive layer 5 and laminating the decorative sheet 6. Thus, at the time of discarding or recycling the decorative board, when the foaming agent is foamed by irradiating with an infrared ray by an IR heater 7, a volume of the layer 4 is expanded to expedite aggregate breaking of the resin 3, and enabling the layer 5 to be completely released together with the sheet 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative panel, and more particularly, to a decorative panel which can be easily separated at the time of disposal, or a decorative panel whose base material can be easily reused.

[0002]

2. Description of the Related Art In general, decorative boards used as interior materials often have a decorative sheet attached to the surface of a base material. Examples of the type of the decorative sheet include a paper material, a plastic sheet, and a resin coated on the surface thereof.

[0003] If such a decorative board is dismantled and discarded at the time of reforming, for example, the surface of the decorative board made of paper can be polished to remove the paper and reuse the base material. In many cases, decorative boards are landfilled as industrial waste.

In order to respond to recent demands for the protection of the natural environment and the reuse of resources, especially for decorative sheets made of plastic sheets, only the plastic sheets are removed and discarded, or the base material is reused. Solving problems such as saving resources is also an urgent issue.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a decorative board having a structure capable of easily removing a decorative sheet and easily separating waste materials in order to meet the above demand. Another object of the present invention is to provide a decorative board that allows the substrate after removing the decorative sheet to be reused by a simple method.

[0006]

Means for Solving the Problems As a result of intensive studies by the present inventors to solve the above-mentioned problems, a release agent is formed by dispersing a foaming agent in a resin, and the release layer is formed on a substrate and a decorative sheet. The inventors have found that a plastic sheet can be easily peeled off by being provided between an adhesive layer that is adhered and utilizing the foaming function of a foaming agent to cause cohesive failure of a resin, thereby completing the present invention.

That is, according to the present invention, in a decorative plate comprising at least a substrate, an adhesive layer and a decorative sheet, a release layer containing a foaming agent and a resin is provided between the substrate and the adhesive layer. It is intended to provide a decorative board characterized by the above.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic sectional view showing one embodiment of the decorative board of the present invention. Base material 1 is plywood, medium density fiberboard (M
DF), a wood-based base such as a particle board, or an inorganic base such as a calcium silicate plate, and is not particularly limited.

A release layer 4 containing a foaming agent 2 and a resin 3 is provided on the surface of the substrate 1. The release layer 4 is mainly composed of the foaming agent 2 and the resin 3 and, if necessary, in consideration of the adhesiveness with the base material 1 or the adhesive layer 5 formed on the release layer. Other additives and the like may be added, but at least the content of the foaming agent 2 and the resin 3 in the release layer 4 is 90%.
It is preferable that the content be not less than mass%.

Further, a primer layer may be provided between the base material 1 and the release layer 4 to further improve the adhesiveness, and a primer layer may be provided between the release layer 4 and the adhesive layer 5. May be provided.

The mixing ratio of the foaming agent 2 and the resin 3 is as follows:
The mass ratio may be in the range of 1:99 to 30:70,
5:95 to 20:80 is preferred, especially 10:90 to 1
A range of 5:85 is preferred.

The foaming agent 2 has a particle size of 2.5 to 25 μm.
m, azodicarbonamide having an expansion ratio of 10 to 50 times is preferred.

This is dispersed in a resin 3 and applied by roll coating or the like to form a release layer 4. 30 to 100 μm, especially 50 to 7 μm.
A film thickness in the range of 0 μm is preferable because the decorative sheet 6 can be easily peeled off and the peeling layer 4 remaining on the substrate 1 after the peeling can be easily performed.

As the resin 3, epoxy acrylate,
Urethane acrylate is preferable, and it is particularly preferable to form a release layer as an electron beam-curable resin.

Electron beam irradiation is preferable because the resin cures without heating.

Of course, an ultraviolet curable resin obtained by adding a polymerization initiator to epoxy acrylate or urethane acrylate may be used. In this case, it is important to prevent the foaming agent 2 from foaming due to heat during irradiation with ultraviolet light.

As described above, the foaming agent 2 and the resin 3
Is formed, and then an adhesive is further applied to bond the adhesive layer 5 and the decorative sheet 6 to obtain a decorative plate.

The adhesive used for the decorative board is generally a modified ethylene vinyl acetate emulsion, but a hot melt adhesive can also be used.

The foaming temperature of the foaming agent 2 is usually 150 to
Since it is 200 ° C, the application temperature is 110 to 130 ° C
It is preferable to use a hot melt adhesive.

It is conceivable that the foaming agent 2 is contained in the adhesive layer 5. However, when the foaming agent 2 is foamed in this state and the decorative sheet 6 is peeled off from the substrate 1, it remains on the surface of the substrate 1. Since the adhesive to be bonded has tackiness, even if the surface is polished to reuse the substrate 1, it cannot be easily polished.

Therefore, as in the present invention, providing a release layer 4 between the base material 1 and the adhesive layer 5 is an effective means.

That is, in the decorative board according to the present invention, as schematically shown in FIG. 2, when the foaming agent 2 is foamed by the IR heater 7 or the like, the volume of the release layer 4 at that portion expands and the resin 3 When the decorative sheet 6 is peeled off after the cohesive failure is promoted, the adhesive layer 5 is also completely peeled off together with the decorative sheet 6, and only the non-sticky peeling layer 4 remains on the surface of the substrate 1. Therefore, the surface can be easily polished.

As the material of the decorative sheet 6, for example, a sheet formed by forming a resin cured by ultraviolet light on a paper material,
It is preferable to use a material that does not easily break when the decorative sheet is peeled off, such as a sheet obtained by applying urethane coating on a paper material or a plastic sheet.

Above all, especially when a plastic sheet is used, even if the peeling speed is increased, it can be peeled cleanly, so that the efficiency of waste material treatment of the decorative board can be improved.

As a method of peeling the decorative sheet from the decorative plate, it is preferable to irradiate infrared rays with a commercially available IR heater 7 or the like to foam the foaming agent because of excellent productivity.

The base material from which the decorative sheet has been peeled can be reused. As described above, since the release layer remaining on the base material does not have tackiness, the remaining release layer can be easily removed by polishing the surface thereof. Even if the layer remains, a release layer can be easily formed on the surface thereof, so that a recycled decorative board can be manufactured in exactly the same manner as when the initial decorative board was manufactured.

[0027]

As described above in detail, in a decorative board comprising at least a substrate, an adhesive layer and a decorative sheet, a peeling agent containing a foaming agent and a resin between the substrate and the adhesive layer. By providing the layer, it is possible to easily separate the decorative board that has become a waste material, and it is possible to recycle and reuse the base material by a simple method.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing one embodiment of a decorative board of the present invention.

FIG. 2 is a schematic view showing a step of peeling a decorative sheet.

[Explanation of symbols]

 Reference Signs List 1 base material 2 foaming agent 3 resin 4 release layer 5 adhesive layer 6 decorative sheet 7 IR heater

Continued on the front page F-term (reference) 2E110 AA64 AB23 BA02 BB03 DC22 EA09 GB42W GB44Z GB52Z 4F100 AH03B AK01D AK25B AK53B AK68C AP02A AP03A AR00B AT00A AT00C AT00D BA04 BA07 BA10D CA01B CB05C GB08B00B08B00B

Claims (5)

[Claims] 1. A decorative plate comprising at least a substrate, an adhesive layer and a decorative sheet, wherein a decorative sheet is provided between the substrate and the adhesive layer.
A decorative plate provided with a release layer containing a foaming agent and a resin. 2. The decorative board according to claim 1, wherein the content of the foaming agent and the resin in the release layer is 90% by mass or more. 3. The mass ratio of the blowing agent to the resin is 1:99.
The decorative board according to claim 2, wherein the ratio is up to 30:70. 4. The decorative board according to claim 1, wherein said foaming agent is azodicarbonamide, and said resin is an epoxy resin or an acrylic resin. 5. The decorative board according to claim 1, wherein the decorative sheet is a plastic sheet.