JPH07106790A - Carbon fiber felt for shielding electromagnetic wave and method for constructing electromagnetic shield by using same - Google Patents

Abstract

PURPOSE:To provide carbon fiber felt for shielding electromagnetic waves which can be easily fitted and can be easily handled by preventing the scattering of carbon fibers and a method for constructing an electromagnetic shield by using the felt. CONSTITUTION:A mat 14 having a thickness of about 7mm is formed by entwining carbon fibers in a curled state. Then carbon fiber felt 10 for shielding is constituted in a panel-like state by impregnating both surfaces or one surface of the mat 14 with a synthetic resin 16. The felt 10 formed in a panel-like state is cut into rectangular pieces of a prescribed size and the walls, floor, and ceiling of a room to be shielded are coated with the felt 10 by successively sticking the cut pieces to the inside of a light steel base material 18 constituting the skeleton of the room. Gaps between adjacent pieces of the felt 10 are filled up with a string-like member 20 of carbon fibers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave shielding carbon fiber felt which is attached to the entire inner surface of a room for electromagnetic wave shielding, and an electromagnetic wave shield construction method for shielding a room using the carbon fiber felt.

[0002]

2. Description of the Related Art Conventionally, since an electromagnetic wave generator such as a wireless microphone is used in a broadcasting facility such as a television station, there is a possibility that radio waves may interfere with each other between adjacent studios. For this reason,
The electromagnetic waves are shielded in each room such as a studio to block the leakage and intrusion of electromagnetic waves. Conventional electromagnetic wave shields are designed so that conductive members such as copper foil and aluminum foil are attached to the entire wall, floor and ceiling of a room without any gaps.

However, when the conductive metal foil is attached and attached as described above, since the metal foil may be damaged, careful handling is required and a lot of time is required for the attachment work. Further, since it is a metal foil, it oxidizes over time, and in particular, the oxidization of the peripheral portion is promoted, the conductivity of the joint portion is impaired, and the electromagnetic wave shielding function is deteriorated.

Therefore, the applicant of the present application has proposed a carbon fiber felt capable of significantly simplifying the construction and maintaining the electromagnetic wave shielding function for a long period of time. This carbon fiber felt is a felt-like material having a thickness of several mm obtained by entwining a single material of carbon fiber into a curl shape, and has conductivity and exerts an electromagnetic wave shielding effect and has great strength.

[0005]

However, in such a conventional carbon fiber felt for a shield, since the carbon fibers are simply entangled to form a felt shape, the tensile strength of the felt is relatively weak and the roll When the sheet is made to have a length of 3 m or more, the sheet is broken due to its own weight, and the work of attaching the sheet to the ceiling surface becomes difficult due to the weakness of the waist, so that the handling becomes extremely difficult. Further, when the carbon fiber felt is cut on site, carbon fibers are scattered about 5 to 10 g / m ² and the work environment is deteriorated.

In view of the above-mentioned conventional problems, the present invention has a carbon fiber felt and a carbon fiber felt for electromagnetic wave shielding, which can remarkably simplify the mounting work and prevent the carbon fibers from scattering to remarkably simplify the handling. An object is to provide an electromagnetic wave shield construction method using a fiber felt.

[0007]

In order to achieve such an object, the carbon fiber felt for electromagnetic wave shielding of the present invention is used when it is attached to the entire inner surface of a room to be shielded to block electromagnetic waves. It is configured by impregnating or coating a synthetic resin on both sides or one side of a mat-shaped mat.

In order to achieve the above object, a first method of constructing an electromagnetic wave shield using a carbon fiber felt according to the present invention is a carbon mat formed by impregnating both sides or one side of a mat in which carbon fibers are formed into a felt shape with carbon. The fiber felt is formed into a panel, and the carbon fiber felt formed into a panel is used as a base material to be attached to the entire inner surface of a room to be shielded, and a carbon fiber string-like member is embedded in a joint portion between adjacent carbon fiber felts.

Further, in order to achieve such an object, a second method of constructing an electromagnetic wave shield using a carbon fiber felt of the present invention is to coat carbon on both sides or one side of a mat in which carbon fibers are formed into a felt shape with a synthetic resin. The fiber felt is formed into a sheet shape, and the sheet-like carbon fiber felt is bonded to the surface of the base material attached to the entire inner surface of the room to be shielded while polymerizing adjacent ones to each other.

[0010]

In the carbon fiber felt for electromagnetic wave shielding of the present invention having the above structure, the carbon fiber felt is formed into a panel by impregnating both or one surface of the mat formed with the carbon fiber into a felt shape with the synthetic resin. It is also possible to form a sheet by coating the surface with a synthetic resin. In the carbon fiber felt thus formed into a panel or a sheet, the synthetic resin increases the bonding force between the carbon fibers, and the felt can be made longer. Therefore, when the carbon fiber felt is attached to the inner surface of the room to be shielded, its handling is remarkably simplified due to the elongated felt, and the cutting work can be significantly reduced, and the carbon fiber at the cutting location can be reduced. Scattering can be significantly reduced.

According to the first method of constructing an electromagnetic wave shield of the present invention, a panelized carbon fiber felt is attached to the entire inner surface of a room to be shielded as a base material, and joints between adjacent carbon fiber felts are used. By embedding a carbon fiber cord-like member in the portion, the entire surface of the room can be covered with the carbon fiber without any gap, and the room can be shielded from electromagnetic waves to prevent leakage and intrusion of electromagnetic waves. Further, since the synthetic resin is impregnated to form the carbon fiber felt into a panel, the binding force between the carbon fibers is increased, so that the handling such as transportation and laying is remarkably easy, and the carbon at the cutting point is The scattering of fibers can be greatly reduced.

Further, according to the second method of applying the electromagnetic wave shield of the present invention, the carbon fiber felt formed into a sheet shape is attached to the entire surface of the inner side of the room, and the adjoining ones are polymerized with each other. By sticking together, the entire surface of the room can be covered with carbon fiber without gaps,
The room can be shielded from electromagnetic waves to prevent electromagnetic waves from leaking and entering. Further, by coating the surface of the carbon fiber felt with a synthetic resin, the binding force between the carbon fibers can be increased, the length of the carbon fiber felt can be increased, and the carbon fiber felt can exhibit flexibility and can be handled as a roll sheet. Therefore, it is possible to simplify the work such as transportation and pasting, to significantly reduce the cutting work, and to greatly reduce the scattering of carbon fibers at the cutting location.

[0013]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. 1 to 5 show an embodiment of a carbon fiber felt 10 for electromagnetic wave shielding and an electromagnetic wave shield construction method using the same according to the present invention, and FIG. 1 shows a carbon fiber 1
2 is a perspective view showing a mat state, and FIG. 2 is a carbon fiber felt 1 obtained by impregnating the mat 14 shown in FIG. 1 with a synthetic resin 16.
0 is a perspective view, FIG. 3 and FIG. 4 are explanatory views showing the steps of constructing the carbon fiber felt 10 in order, and FIG. 5 is a graph showing the attenuation characteristics of electromagnetic waves.

That is, in the carbon fiber felt 10 for electromagnetic wave shielding of this embodiment, as shown in FIG. 1, a unit weight of the carbon fiber 12 is curled in a curled shape to form a unit weight of about 7 mm and a basis weight of 300 g / m 2. ^As shown in FIG. 2, synthetic resin 16 is impregnated on both sides or one side of the mat 14 of No. 2 to construct. By impregnating the surface of the mat 14 with the synthetic resin 16 in this manner, the entire carbon fiber felt 10 is cured to form a panel.

The panelized carbon fiber felt 10
Are cut into a predetermined rectangular shape, and as shown in FIG. 3, they are attached one after another as a base material panel inside the light iron base material 18 that forms the skeleton of the room to be shielded to cover the walls, floor and ceiling. To go. At this time, an interval δ is provided between the adjacent carbon fiber felt 10 and the joining portion, and as shown in FIG. 4, the string-shaped member 20 made of carbon fiber is packed in this interval δ without any gap. . As the string-like member 20, a felt-like member made of carbon fiber is preliminarily cut according to size so that it can be inserted into joints, and the carbon fiber is softened to be formed into a string shape having elasticity. .

Therefore, by covering the entire inner surface of the room with the panelized carbon fiber felt 10 and filling the string-like member 20 between the joints, it is possible to completely shield the room and to prevent electromagnetic waves from leaking. Intrusion can be blocked. FIG. 5 is a graph showing the attenuation characteristics of electromagnetic waves as an electromagnetic wave shield in comparison with carbon fiber felt which is not impregnated with synthetic resin, taking UHF band 100 to 1000 MHz as an example. Almost the same when impregnated with synthetic resin. It was confirmed that the shielding performance of

FIGS. 6 and 7 show another embodiment, in which the same components as those in the above-mentioned embodiment are designated by the same reference numerals, and a duplicate description will be omitted. That is, in the electromagnetic wave shielding carbon fiber felt 10a of this embodiment, the synthetic resin 16a is coated on both surfaces or one surface of the carbon fiber mat 14 to form a sheet.

Therefore, the electromagnetic wave shielding carbon fiber felt 10a of this embodiment is formed in a sheet shape and has flexibility, and the carbon fiber felt 10a is bonded to the wall, floor and ceiling of a room. That is, as shown in FIG. 7, the carbon fiber felt 10 a has the base board 22 attached to the inside of the light iron base material 18, and is sequentially attached to the inside of the base board 22. At the time of this attachment, the adjacent carbon fiber felts 10a are polymerized with each other (overlap width of about 100 mm) to prevent the occurrence of gaps.

Therefore, in this embodiment, by adhering the sheet-shaped carbon fiber felt 10a to the inner surface of the room without any gap, it is of course possible to obtain the same electromagnetic wave attenuation characteristics as those of the above-mentioned embodiment. Since the carbon fiber felts 10a can be polymerized with each other and adhered to each other without a gap by forming the shape,
The construction can be greatly simplified. Even in the case of such a sheet-like carbon fiber felt 10a, when a gap is provided between the adjoining portions of adjacent ones and the sheets are successively laminated, the joining portion gap is the same as in the above embodiment. It can be constructed by embedding a carbon fiber cord-like member in the.

By the way, in each of the above-mentioned embodiments, the synthetic resin 16, 16 is applied to the mat 14 in which the carbon fiber 12 is entangled.
Carbon fiber felt 1 impregnated or coated with a
Since 0 and 10a are configured, the binding force of each carbon fiber 12 is increased, so that the scattering of the carbon fiber 12 when cut can be reduced to 1 g / m ² or less, and particularly in a sheet shape. When carbon fiber felt 10a
Can be formed as a long product having a length of 10 m or more.
In addition, all the inner surfaces of the room are carbon fiber felt 1 like this.
Since it is composed of 0 or 10a, there is no problem of corrosion resistance of the joint portion, and it is excellent in earthquake resistance, heat resistance, and weather resistance, and the shield property can be maintained semipermanently.

Comparative Example 1 When a carbon fiber sheet material having a thickness of 7 mm and a basis weight of 300 g / m ^{2 according} to the applicant's earlier application was applied by a conventional method, 9 g / m ² of carbon fiber was cut. -Although it was scattered as a result of the sticking work, the sheet material shown in this example was able to reduce the scattering.

Comparative Example 2 The carbon fiber sheet material according to the applicant's earlier application was used in 3.
Although an attempt was made to form a long product having a length of 5 m and the work was impossible due to the breakage due to its own weight, the sheet material of the present example made it possible to form a long product.

[0023]

As described above, in the carbon fiber felt for electromagnetic wave shielding according to the present invention, the synthetic resin is impregnated or coated on both sides or one side of the mat in which the carbon fiber is formed into a felt shape. Since this carbon fiber felt is formed into a panel or sheet to increase the binding force between carbon fibers, it is possible to lengthen the felt and the handling when attaching the felt to the inner surface of the room is remarkable. The simplification and cutting work can be significantly reduced, and the scattering of carbon fibers at the cutting location can be significantly reduced. In addition, since the inner surface of the room, including joints, is made entirely of carbon fiber felt, it has excellent corrosion resistance, as well as earthquake resistance, heat resistance, and weather resistance, and maintains semi-permanent shielding. It has various excellent effects.

In the electromagnetic wave shield construction method using the carbon fiber felt according to the second aspect, the carbon fiber felt, which is made into a panel by impregnating the surface with synthetic resin, is used as a base material on the entire inner surface of the room to be shielded. Since the carbon fiber cord-like member was embedded in the joint between the adjacent carbon fiber felts, it was possible to cover the entire surface of the room with carbon fibers without any gaps, shielding the room from electromagnetic waves and preventing electromagnetic waves from leaking and entering. Can be prevented. Further, since the carbon fiber felt is impregnated with a synthetic resin to form a panel, it can be used also as a base material,
The bonding force between the carbon fibers is increased, the handling thereof is significantly simplified, and the scattering of the carbon fibers at the cut portion can be greatly reduced.

Further, in the electromagnetic wave shield construction method using the carbon fiber felt according to claim 3, the surface of the base material having the sheet-shaped carbon fiber felt formed by coating the surface with a synthetic resin to form a sheet is attached. In addition, because the adjacent ones were laminated while superposing each other,
The entire surface of the room can be covered with carbon fibers without any gap, and the room can be shielded from electromagnetic waves to prevent leakage and intrusion of electromagnetic waves. Further, since the carbon fiber felt has a surface coated with a synthetic resin to increase the binding force between the carbon fibers to enable lengthening and to have flexibility, the handling thereof is significantly simplified, It has various excellent effects that the cutting work can be greatly reduced and the scattering of the carbon fibers at the cutting location can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a matted state of a carbon fiber felt for electromagnetic wave shielding according to the present invention.

FIG. 2 is a perspective view showing an embodiment of the carbon fiber felt of the present invention.

FIG. 3 is a perspective view showing an attached state of a carbon fiber felt showing an embodiment of an electromagnetic wave shield construction method according to the present invention.

FIG. 4 is a perspective view showing an embedded state of a joint portion of a carbon fiber felt showing an embodiment of an electromagnetic wave shield construction method according to the present invention.

FIG. 5 is a graph showing the attenuation characteristics of electromagnetic waves by the carbon fiber felt of the present invention.

FIG. 6 is a perspective view showing another embodiment of the carbon fiber felt of the present invention.

7 is a cross-sectional view showing another embodiment of the electromagnetic wave shield construction method according to the present invention, which uses the other carbon fiber felt of FIG.

[Explanation of symbols]

 10, 10a Electromagnetic wave shielding carbon fiber felt 12 Carbon fiber 14 Mat 16, 16a Synthetic resin 20 String member 22 Base board

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masanori Matsuyama 4-1-2, Hiranocho, Chuo-ku, Osaka-shi, Osaka Prefecture Osaka Gas Co., Ltd. (72) Juichi Takeda 4-640, Shimoseito, Kiyose-shi, Tokyo Shares Obayashi Corporation Technical Research Institute (72) Inventor Katsuo Yoshida 4-640 Shimoseido, Kiyose-shi, Tokyo Stock Company Obayashi Engineering Research Institute (72) Inventor Akihiro Zama 2-3 Kandajicho, Chiyoda-ku, Tokyo Obayashi Corporation (72) Inventor Kazutoshi Tsutsumi 2-3 Chome Kandajimachi, Chiyoda-ku, Tokyo Stock company Obayashi Corporation Tokyo headquarters (72) Inventor Toru Okui 4-33 Kitahama East, Chuo-ku, Osaka City, Osaka Stock Company Obayashi Main Store

Claims (3)

[Claims] 1. A mat used for shielding electromagnetic waves by being attached to the entire inner surface of a room to be shielded, wherein both sides or one side of a mat formed of carbon fiber in a felt shape is impregnated or coated with a synthetic resin. Carbon fiber felt for electromagnetic shielding. 2. The entire inner surface of a room in which a carbon fiber felt is formed into a panel by impregnating both sides or one side of a mat in which carbon fibers are formed into a felt shape with a synthetic resin, and the panelized carbon fiber felt is used as a base material for shielding. An electromagnetic wave shield construction method using a carbon fiber felt, characterized in that the carbon fiber felt is embedded in a joint portion between adjacent carbon fiber felts. 3. A carbon fiber felt is formed into a sheet by coating both sides or one side of a mat in which the carbon fiber is formed into a felt shape with a synthetic resin, and the sheet of carbon fiber felt is shielded from the inside of a room. An electromagnetic wave shield construction method using a carbon fiber felt, characterized in that adjacent ones are bonded to each other while superposing each other on the surface of the base material attached to the entire surface.