JP4608700B2 - Plasterboard - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gypsum board having the ability to shield electromagnetic waves (hereinafter referred to as “shielding performance”).
[0002]
[Prior art]
FIG. 3A is a partial cross-sectional perspective view of a conventional gypsum board having shielding performance, and FIG. 3B is a cross-sectional view. This gypsum board 10 has a conductive mesh 12 embedded in a back surface of a rectangular plaster gypsum constituting portion 11 substantially in parallel with the back surface, and a finishing material such as paper (surface) on the front and back surfaces of the gypsum constituting portion 11. The finishing material 13a and the back surface finishing material 13b) are pasted.
The conductive mesh 12 is formed in a net shape with a conductive material.
[0003]
[Problems to be solved by the invention]
However, the conventional gypsum board has a problem that the shielding performance is not always sufficient.
In the present invention, a gypsum board capable of improving shielding performance is provided.
[0004]
[Means for Solving the Problems]
In the gypsum board according to the present invention, the first conductive mesh is embedded on the surface side of the gypsum component part substantially parallel to the surface, and the second conductive material is arranged substantially parallel to the back surface side of the gypsum component part. The gypsum component is embedded in a main component such as gypsum by mixing a carbon fiber material in a weight ratio of 1 Wt% or more and a carbon material having a particle size of 100 μm or less in a weight ratio of 10 Wt% or more. The distance between the first and second conductive meshes is set to the λ / 4 wavelength of the electromagnetic wave to be shielded or a value close thereto .
The carbon fiber material is a carbon fiber material having a length of 6 mm or less, and the carbon fiber material having a length of 6 mm or less is mixed in the main component such as gypsum at a ratio of 3 Wt% or less by weight. It was.
Further, the size of the mesh opening of the first conductive mesh is different from the size of the mesh opening of the second conductive mesh.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a gypsum board according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1A is a partial sectional perspective view of a gypsum board according to an embodiment, and FIG. 1B is a sectional view. The same components as those of the conventional example of FIG.
The gypsum board 1 according to the embodiment has a first conductive mesh 21 embedded in the surface side of the gypsum component 2 and a second conductive mesh 22 embedded in the back side of the gypsum component 2. It is what.
That is, the gypsum board 1 has a mesh double structure in which two conductive meshes are embedded in the thickness direction of the gypsum board 1 so as to be embedded substantially in parallel with the front and back surfaces of the gypsum board 1.
[0006]
The gypsum component 2 is composed of a carbon fiber material having a weight ratio of 10 Wt% and a length of 6 mm of a carbon material having a particle size of 44 μm or less in calcined gypsum in a main component made of slaked lime, dolomite plaster, clay, and an adhesive. It is composed of a mixture of 2 wt% by weight.
The first and second conductive meshes 21 and 22 are made of the conductive material on the surface of a wire made of a conductive material such as gold, silver, steel, stainless steel, aluminum, zinc, nickel, carbon, or polymer fiber. Wires coated with a coating of a conductive material, or those printed with a conductive ink on the back side of a surface finish or those formed in a net shape with a film or the like are used. In the embodiment shown in FIG. 1, the mesh mesh, that is, the first and second conductive meshes 21 and 22 having different mesh opening sizes are used. That is, an example is shown in which the first conductive mesh 21 has a mesh opening larger than that of the second conductive mesh 22.
[0007]
The distance W between the first and second conductive meshes 21 and 22 is set to the λ / 4 wavelength of the shielded electromagnetic wave or a value as close as possible to this.
[0008]
FIG. 2 shows a result of comparing the shielding performance of a single gypsum mesh gypsum board in which a conductive mesh 22 is embedded on the back side of the gypsum component 2 and a gypsum board having a double mesh structure according to the present embodiment.
In FIG. 2, the lower curve is the shielding performance curve of the gypsum board having a single mesh structure, and the upper curve is the shielding performance curve of the gypsum board having a mesh double structure according to this embodiment.
In addition, the structure of the gypsum component 2 and the conductive mesh 22 in the gypsum board having the mesh single structure and the mesh double structure is the same.
[0009]
As apparent from FIG. 2, the gypsum board having a single mesh structure has a value of about 40 dB in the frequency band where the shielding performance is low in the frequency band of 10 MHz to 1000 MHz. The gypsum board has a shielding performance of at least 50 dB against electromagnetic waves in a frequency band of 10 MHz to 1000 MHz. Therefore, the gypsum board 1 that can cope with the case where the required shield performance is 50 dB or more is obtained.
In addition, the shielding performance against electromagnetic waves in the frequency band of 10 MHz to 1000 MHz is improved as a whole compared to a gypsum board with a single mesh structure, and the overall shielding performance is higher than that of a gypsum board with a mesh single structure. A gypsum board 1 is obtained.
[0010]
That is, according to the gypsum board 1 having a mesh double structure according to the embodiment, for example, when an electromagnetic wave of 100 dBμV / m is incident from the surface side of the gypsum board 1, the shielding performance of the first conductive mesh 21 is 20 dB. If present, the electromagnetic wave of 80 dBμV / m is equivalent to being incident on a gypsum board having a mesh single structure having a performance of 40 dB or more, so that the shielding performance is improved as a whole.
[0011]
Further, the electromagnetic wave incident from the surface side of the gypsum board 1 and transmitted through the first conductive mesh 21 reaches the second conductive mesh 22 through gypsum having an electrical surface resistance (about 20Ω). Here, the electromagnetic wave is reflected again on the surface side and enters the gypsum between the first and second conductive meshes 21 and 22. Since this is repeated, the electromagnetic wave absorption performance is improved as compared with the gypsum board having a single mesh structure.
[0012]
Further, since the distance W between the first and second conductive meshes 21 and 22 is set to the λ / 4 wavelength of the electromagnetic wave to be shielded or a value as close as possible to this, the shielding performance and electromagnetic wave absorption performance are high. It becomes gypsum board 1.
[0013]
That is, according to the gypsum board 1 of the present embodiment, the gypsum component 2 having the first and second conductive meshes 21 and 22 is adopted, the gypsum component 2 having high shielding performance is provided, Since the distance W between the first and second conductive meshes 21 and 22 is set to the λ / 4 wavelength of the electromagnetic wave to be shielded or a value as close as possible to this, the gypsum board 1 having high shielding performance and electromagnetic wave absorption performance. Is obtained.
If a room is constructed using the gypsum board 1 according to the embodiment, leakage of electromagnetic waves from the room to the outside or from the outside to the room can be prevented, and electromagnetic waves emitted from the communication device in the room can be absorbed. It becomes possible to prevent malfunction of the device and information transmission error.
[0014]
In the embodiment, the first conductive mesh 21 has a larger mesh opening than the second conductive mesh 22, but the first conductive mesh 21 is the second conductive mesh 22. A smaller mesh opening may be used, or the first and second conductive meshes 21 and 22 having the same mesh opening size may be used.
Also, if the mesh openings of the first and second conductive meshes 21 and 22 are too large, the shielding performance against electromagnetic waves in the frequency band to be shielded may not be satisfied. If it is too small, the gypsum component 2 may peel off due to the conductive mesh. Therefore, it is desirable to set it to about 4 mm square at least.
Further, the first and second conductive meshes 21 and 22 may be made of the same material, or may be made of different materials.
[0015]
The gypsum component 2 may be constituted by mixing a conductive material in a main component such as gypsum. At least, for example, a carbon fiber material having a weight ratio of 1 Wt% or more and a particle size of 100 μm or less is a carbon material. Is preferably mixed with a weight ratio of 10 Wt% or more. In this case, if the weight ratio of the main component of the gypsum component is 50 Wt% or less, the strength of the gypsum component is weakened. Therefore, the weight ratio of the main component is desirably 50 Wt% at least. The carbon fiber material of 6 mm or less is preferably 3 Wt% or less. This is because if a carbon fiber material of 6 mm or more is mixed, or if the weight ratio is 3 Wt% or more, expansion will increase and mixing will not be possible.
[0016]
Although the distance W between the first and second conductive meshes 21 and 22 is set to the λ / 4 wavelength of the electromagnetic wave to be shielded or a value as close as possible to this, the double mesh structure can be used without doing this. The shield performance is improved compared to the gypsum board that adopts the single mesh structure.
[0017]
Moreover, you may employ | adopt the double mesh structure of this application for the gypsum structure part which does not mix electroconductive materials, such as a carbon fiber material and a carbon material. Even if it does in this way, it is because a gypsum board with a high shield performance is obtained compared with the gypsum board which employ | adopted the single mesh structure for the gypsum structure part which does not mix conductive materials, such as a carbon fiber material and a carbon material.
[0018]
In the embodiment, a gypsum board having a double mesh structure has been described as an example. However, in the present application, a gypsum board having the following configuration may be used.
That is, a gypsum board in which a conductive mesh is embedded on the front surface side located inside the room and a conductive sheet formed in a sheet shape on the back surface side located outside the room may be used. Even with this type of gypsum board, leakage of electromagnetic waves from the room to the outside or from the outside to the room can be prevented, and electromagnetic waves emitted from the communication devices in the room can be absorbed, leakage of electromagnetic waves, malfunction of communication devices and information transmission errors. Can be prevented.
Moreover, it is good also as the gypsum board of the double sheet structure which embeded the electroconductive sheet on the surface and the back side, respectively, and even the gypsum board of such a configuration can prevent leakage of electromagnetic waves from the room to the outside or from the outside to the room, Shield performance can be improved.
Furthermore, three or more conductive meshes or conductive sheets embedded substantially parallel to the surface of the gypsum board may be provided in the thickness direction of the gypsum board.
[0019]
【The invention's effect】
As described above, according to the gypsum board according to claim 1 of the present invention , the first conductive mesh is embedded substantially parallel to the surface on the surface side of the gypsum component, and the back surface on the back side of the gypsum component. A second conductive mesh is embedded substantially in parallel with the gypsum component, and the gypsum component is composed of a carbon fiber material having a weight ratio of 1 Wt% or more and a particle size of 100 μm or less of a carbon material in a weight ratio of 10 Wt%. Since it is configured to be mixed and the distance between the first and second conductive meshes is set to the λ / 4 wavelength of the electromagnetic wave to be shielded or a value close thereto , the gypsum has a single mesh structure. A gypsum board with higher shielding performance than the board can be obtained.
Further, the carbon fiber material is a carbon fiber material having a length of 6 mm or less , and the carbon fiber material having a length of 6 mm or less is mixed in a main component such as gypsum at a ratio of 3 Wt% or less by weight. Therefore, the carbon fiber material can be mixed well in the main component, and a gypsum board having high shielding performance can be obtained.
In addition, since the size of the mesh opening of the first conductive mesh and the size of the mesh opening of the second conductive mesh are different, it is possible to obtain a gypsum board having higher shielding performance than a gypsum board having a single mesh structure. it can.
[Brief description of the drawings]
FIG. 1 is a partial sectional perspective view and a sectional view of a gypsum board according to an embodiment of the present invention.
FIG. 2 is a diagram comparing the shielding performance of a gypsum board having a single mesh structure and a gypsum board having a mesh double structure according to an embodiment.
FIG. 3 is a partial sectional perspective view and a sectional view of a conventional gypsum board.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Gypsum board, 2 gypsum component, 21,22 1st, 2nd electroconductive mesh, W The distance between 1st, 2nd electroconductive mesh.

Claims (3)

A first conductive mesh is embedded substantially parallel to the surface on the surface side of the gypsum component, and a second conductive mesh is embedded substantially parallel to the back surface on the back side of the gypsum component,
The gypsum constituent part is configured by mixing a carbon fiber material in a weight ratio of 1 Wt% or more and a carbon material having a particle size of 100 μm or less in a weight ratio of 10 Wt% or more in a main component such as gypsum,
The gypsum board characterized in that the distance between the first and second conductive meshes is set to a λ / 4 wavelength of the electromagnetic wave to be shielded or a value close thereto. The carbon fiber material is a carbon fiber material having a length of 6 mm or less, and the carbon fiber material having a length of 6 mm or less is mixed in the main component such as gypsum at a ratio of 3 Wt% or less by weight. The gypsum board according to claim 1. The gypsum board according to claim 1 or 2, wherein the size of the mesh opening of the first conductive mesh is different from the size of the mesh opening of the second conductive mesh .

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