JP4934584B2 - Sheet material, electromagnetic shielding sheet material, wallpaper, and electromagnetic shielding tape for electric wires - Google Patents

Description

  The present invention relates to a sheet material, a sheet material for electromagnetic wave shielding, wallpaper, and an electromagnetic wave shielding tape for electric wires, and particularly relates to a configuration of a base fabric of a plated sheet material.

  Conventionally, shielding of electromagnetic waves has been a known problem in many technical fields. For example, small electronic communication devices represented by mobile phones tend to emit more electromagnetic waves than ever for higher functionality, and it is important to suppress the impact on internal electronic components. Yes. In addition, many facilities are digitized in factories and the like, and countermeasures against noise or malfunction due to electromagnetic waves emitted from digitized devices and power lines in the factories are required. Many electrical components are also used in the field of automobiles, and electromagnetic shielding is becoming important. Furthermore, the need for electromagnetic wave shielding is increasing in homes, hospitals and the like due to recent health consciousness, consideration for pacemaker users, patients with electromagnetic hypersensitivity, and the like.

For these electromagnetic wave shields, a sheet material obtained by plating a base material made of metal fiber, nonwoven fabric or the like is often used (for example, see Patent Documents 1 to 4).
JP 2004-091877 A JP 2004-276443 A JP 2000-124660 A JP 2004-327687 A

  The electromagnetic wave shielding characteristics greatly depend on the amount of metal attached to the substrate by the plating process, and the electromagnetic shielding characteristics are improved as the amount of attached metal increases. However, in a knitted fabric or woven fabric using metal fibers, the fibers are thick and rigid, resulting in a thick material. In order to overcome this, a material plated with a nonwoven fabric as a base material is used. However, the polymer fibers constituting a general spunbonded nonwoven fabric have a limited surface area from the lower limit of the diameter. In general, electroless plating is used for plating a sheet material for electromagnetic wave shielding. However, in electroless plating, the metal is formed in the part in contact with the plating solution of the object to be plated, so the surface area of the fiber is small. As a result, the amount of metal attached decreases accordingly. Therefore, even if the thickness of the base material is increased in order to increase the amount of adhesion, there is a limit to the permeability of the plating solution, so the plating solution does not penetrate sufficiently deep into the base material, and the basis weight (per unit area) The weight of the substrate) and the thickness of the substrate are unnecessarily increased.

  However, the electromagnetic wave shield is strongly required to be light and thin depending on the application. For example, in the above-mentioned mobile phone, the degree of integration of parts has already reached the limit, and further slimming and weight reduction are required, and the weight and thickness of the base material that does not contribute to the electromagnetic shielding function will increase. It must be avoided as much as possible. Even in the case of an electromagnetic wave shield for automobile electrical components, the thinner the substrate is, the more preferable for reducing the weight of the automobile.

  In light of the above problems, an object of the present invention is to provide a sheet material that is lightweight, thin, and has a large amount of metal adhesion. Moreover, an object of this invention is to provide the various application goods which exhibit an electromagnetic wave shielding effect using this sheet | seat material.

According to one embodiment of the present invention, the sheet material has a base fabric including at least one fiber array layer in which continuous long fibers are arrayed by extending substantially linearly in one direction, and at least of the base fabric one surface, plating metals are plated in a state of adhering to the surface of the long fiber, basis weight of the base fabric 5 g / m ² or more, Ru der 60 g / m ² or less.

  In the base fabric configured in this way, since the long fibers are arranged substantially linearly in one direction, the fibers can be densely arranged without gaps. Since the long fibers are drawn, the diameter of the fibers is reduced, and a large number of fibers can be arranged with a small diameter. And the specific surface area (surface area per unit volume) of a fiber can be increased by these synergistic effects. The amount of metal attached by plating greatly depends on the specific surface area of the fiber, especially the specific surface area of the fiber near the surface of the base fabric, so that the metal adheres more than when using a base fabric with randomly oriented fibers as in the past. Efficiency increases and more metal can be deposited. In addition, by stretching the continuous long fibers in a substantially straight line in one direction, the fibers can be extended in the in-plane direction of the sheet material, and the filling efficiency of the fibers in the base fabric can be increased. Material can be created. Being thin, the metal is easily formed over the entire thickness of the base fabric, leading to a merit that the metal deposition efficiency is further increased. As a result, a sufficient amount of metal adhesion can be obtained with a thin sheet, which contributes to weight reduction and also contributes to further thinning in combination with the above-described inherently bulky characteristics.

  The base fabric may include a plurality of fiber array layers, and some fiber array layers and other fiber array layers may be laminated so that the extending directions of the long fibers are different from each other.

  According to another embodiment of the present invention, an electromagnetic wave shielding sheet material, wallpaper, and electric wire electromagnetic wave shielding tape have the sheet material.

  As described above, according to the present invention, it is possible to provide a sheet material that is lightweight, thin, and has a large amount of metal adhesion. Moreover, according to this invention, the various application goods which exhibit an electromagnetic wave shielding effect can be provided using this sheet | seat material.

  Hereinafter, an embodiment of the sheet material of the present invention will be described. FIG. 1 is a cross-sectional view of a sheet material according to an embodiment of the present invention. The sheet material 1 has a base fabric 2 made of a non-woven fabric and plated portions 3 a and 3 b formed on both surfaces of the base fabric 2. Although the plating parts 3a and 3b are actually metals attached to the surface of the fiber as will be described later, in FIG. 1, they are displayed in the form of layers for the convenience of illustration. Although the plating parts 3a and 3b are formed on both surfaces of the base fabric 2 by electroless plating, they may be formed only on one side. As the metal to be attached, any material may be used as long as the formed plating parts 3a and 3b can exhibit an electromagnetic wave shielding effect. However, as an example, a configuration in which copper and nickel are sequentially attached to the fiber is preferable. Used. In this configuration, copper is mainly responsible for the electromagnetic shielding effect, and nickel is mainly responsible for the rust prevention effect.

  The amount of the deposited metal can be adjusted by changing the time during which the base fabric 2 is immersed in the plating solution. If the base fabric is dipped in the plating solution for a short time, an amount of metal that does not impair the inherent breathability of the base fabric can be adhered. An amount of metal to be coupled can also be deposited.

  FIG. 2 is an exploded perspective view of the base fabric. The base fabric 2 is configured by laminating a plurality of fiber array layers in which continuous long fibers are stretched substantially linearly in one direction and arranged. In the figure, four fiber array layers 12A, 12B, 12C, and 12D are shown. However, the number of stacked layers can be determined as appropriate, and depending on the application, only one fiber array layer is provided as described later. It doesn't matter. The fiber array layers 12A, 12B, 12C, and 12D are thermocompression bonded together to form one base fabric 2 as a whole.

  FIG. 3 is an enlarged partial perspective view showing a part of the fiber array layer of the base fabric. Only the fiber array layers 12A and 12B are shown in the figure, but the other fiber array layers have the same configuration. As illustrated, the fiber array layer 12A is an aggregate of a large number of fibers 13A extending in parallel and linearly to each other. Similarly, the fiber array layer 12B is an aggregate of a large number of fibers 13B extending in parallel and in a straight line. The fibers 13A and 13B may be folded in the middle or laminated in two or more layers. The fiber array layer 12A can be made from thermoplastic resins such as polyethylene, polypropylene, polyester, polyamide, polyvinyl chloride resin, polyurethane, and fluorine resin, and modified resins thereof. Resins by wet or dry spinning means such as polyvinyl alcohol resins and polyacrylonitrile resins can also be used. The same applies to the fiber array layer 12B. The diameter of each fiber 13A, 13B is, for example, about 10 μm. The fiber array layers 12A and 12B are laminated so that the stretching direction 15A of the fibers 13A of the fiber array layer 12A and the stretching direction 15B of the fibers 13B of the fiber array layer 12B are orthogonal to each other. The stretching direction 15C of the fibers 13C of the fiber array layer 12C is orthogonal to the stretching direction 15B of the fibers 13B of the fiber array layer 12B. Similarly, the extending direction 15D of the fibers 13D of the fiber array layer 12D is orthogonal to the extending direction 15C of the fibers 13C of the fiber array layer 12C. The fiber array layers do not have to be perpendicular to each other between adjacent fiber array layers, and may be sequentially laminated with a certain angular difference. Two or more fiber array layers having the same stretch direction may be used. The fiber array layer may be provided continuously.

The basis weight of the base fabric is preferably 5 g / m ² or more and 60 g / m ² or less. Adhesive means such as an adhesive tape and an adhesive material may be provided on one or both surfaces of the base fabric.

  The fibers 13A, 13B, 13C, 13D of the fiber array layers 12A, 12B, 12C, 12D are stretched and arranged in the stretching directions 15A, 15B, 15C, 15D. For this reason, compared with the nonwoven fabric produced using the conventional melt blow method etc., the linearity and directionality of a fiber are very high, and also the density of a fiber is high. As a result, the specific surface area of the fibers of the base fabric 2 can be increased as compared with the conventional nonwoven fabric. As an example, the fiber diameter of a nonwoven fabric produced by a conventional spunbond method is generally about 20 μm, but the nonwoven fabric of this embodiment can be produced with a fiber diameter of about 10 μm. This is because the fiber extruded from the nozzle is further drawn in a later step, as will be described later. If the fiber weight per unit length is the same between the case where the fiber diameter is 20 μm and the case where the fiber diameter is 10 μm, one fiber having a diameter of 20 μm corresponds to four fibers having a diameter of 10 μm. However, since the surface area is proportional to the circumference, when the fiber diameter is 10 μm, the surface area is twice as large as when the fiber diameter is 20 μm. Since electroplating is a technique for forming a metal on an object to be plated that is in contact with a plating solution through a chemical reaction, the metal is formed on the surface of each fiber. Therefore, the volume or surface area of the formed metal depends not on the surface area of the base fabric but on the total surface area of the fibers constituting the base fabric 2. For this reason, in the base fabric 2 of this embodiment, it becomes possible to make more metal adhere to a fiber layer.

  Moreover, in the nonwoven fabric by this embodiment, since a fiber is piled up linearly substantially parallel to each other, there are few entanglements and it exposes in the state where the fiber was densely packed on the surface of the fiber arrangement layer. Since the electroplating solution penetrates into the inside of the base fabric, the metal is also formed inside the base fabric, but the metal is most likely to adhere to the surface of the fiber array layer and its vicinity. And in this embodiment, since the liquid contact area of the fiber on the surface of a base fabric has increased, the adhesion efficiency of a metal increases. In other words, in the conventional base fabric, it was necessary to attach a metal from the surface to a sufficient depth in the thickness direction of the base fabric, whereas in the base fabric of this embodiment, the adhesion efficiency on the surface is high, A sufficient amount of deposition can be obtained even if the metal is deposited only to a shallower depth than in the past. As a result, the sheet material is reduced in thickness and weight.

Moreover, since the base fabric of this embodiment is formed by extending | stretching, it is inherently thin (thickness is small) compared with the conventional base fabric. Therefore, the completed sheet material can be thinner than the conventional sheet material. Further, this inherent bulkiness increases the penetration efficiency of the electroplating solution and further improves the metal deposition efficiency. As a result, a further reduction in thickness and weight is achieved. This is an important advantage particularly in small electronic devices such as mobile phones. Furthermore, the feature of being bulky leads to ease of handling such as storage and transportation. In general, a conventional nonwoven fabric has a thickness of about 200 μm when the basis weight is about 30 g / m ² , but the base fabric of this embodiment can be reduced to a thickness of about 100 μm when the basis weight is about 30 g / m ² .

  Moreover, since the base fabric of this embodiment consists of continuous continuous fibers, the fibers are less likely to fall off when immersed in an electroplating solution, which is advantageous from the viewpoint of preventing contamination of the electroplating solution. Since the fibers do not easily fall off, the base fabric is easy to maintain its original state even after long-term use, and there is an advantage that the strength is not easily lowered.

  Furthermore, the base fabric of the present embodiment does not substantially contain an additive having volatile property or bleed-out property at room temperature and a processing aid having volatile property or bleed-out property. In general, a nonwoven fabric itself contains various additives in order to enhance spinnability, processability, and stretchability, or a processing aid necessary for each step is added. For example, in a conventional nonwoven fabric, fibers are entangled in a complicated manner, and thus it is necessary to reduce resistance during antistatic or stretching. For these purposes, an additive or processing aid containing oil is used. . However, in electroless plating, it is necessary to keep the surface of the object to be cleaned in a clean state by polishing or washing in order to improve the adhesion of the metal. In the base fabric of this embodiment, the fibers are linearly arranged in one direction, and the arrangement unevenness is small. Therefore, the intersections of the fibers are less likely to be stretched at the time of drawing, and it is difficult to be charged. For this reason, the adhesiveness to a metal base fabric is favorable.

  Next, various embodiments using the above-described sheet material will be described.

  FIG. 4 is a schematic cross-sectional view of a mobile phone using the sheet material of the present invention as an electromagnetic wave shielding sheet material. A display unit 43 and an operation unit 44 are provided in the case 42 of the mobile phone 41, and a substrate 45 is provided inside the case 42. A speaker and a call port (not shown) are also provided on the same surface as the display unit 43. An antenna 44 that is a main source of electromagnetic waves is further provided inside the housing 42. An electromagnetic wave shielding sheet material 46 is attached to the inner surface of the housing 42 via an adhesive means such as an adhesive or an adhesive tape. Since the antenna 44 must always emit electromagnetic waves to the outside for communication with the base station, the antenna 44 is placed outside the electromagnetic shielding sheet material 46, but the substrate 45 is placed inside the electromagnetic shielding sheet material 46. positioned.

  In the mobile phone 41 configured as described above, the electromagnetic wave emitted from the antenna 44 is difficult to reach the inside of the casing 42, and the influence on various elements installed on the substrate 45 is mitigated. As described above, since the electromagnetic shielding sheet material 46 of the present embodiment is thin, the influence on the internal space of the housing 42 is small and the weight is small, so that the weight of the cellular phone is not increased.

  FIG. 5 is a schematic sectional view of a wallpaper using the sheet material of the present invention as an electromagnetic wave shield. The wallpaper 51 has a laminated structure in which a wallpaper body 52 and an electromagnetic shielding sheet material 53 are bonded together with an adhesive tape 54. The wallpaper 51 is bonded to a reinforced concrete wall 55 with an adhesive 56 in such a direction that the wallpaper body 52 faces the interior space 57 of the room. Electromagnetic waves generated from high-voltage power transmission lines and general electric equipment are extremely low frequency electromagnetic waves of 50 Hz or 60 Hz, and it is said that shielding is difficult even with concrete. By applying the wallpaper 51 of this embodiment to a wall of a house or a hospital, the electromagnetic shielding performance of the wall can be enhanced.

  The wallpaper of this embodiment can be applied not only to a concrete wall but also to a mortar wall of a wooden house. Moreover, it is applicable to a ceiling and a floor as required, and can be embedded in the housing in advance. Moreover, it can be used for any part of a building where an electromagnetic shielding effect can be expected, such as partitions, doors, and shutters.

  FIG. 6 shows an example in which the sheet material of the present invention is applied to an electromagnetic wave shielding tape for electric wires. FIG. 4A is a conceptual side view, and FIG. 4B is a conceptual cross-sectional view. The electric wire 61 has a configuration in which a plurality of covered electric wires 62 are gathered, and the whole is covered with an outer jacket 63. A filler called interposition 64 is filled between the covered electric wires 62. A wire electromagnetic wave shielding tape 65 is spirally wound around the aggregate of the covered electric wires 62. The electromagnetic wave shielding tape 65 for electric wires not only binds the covered electric wires 62 but also effectively shields electromagnetic waves generated from the covered electric wires 62.

  The base fabric of the electromagnetic wave shielding tape 65 for electric wires used in the present embodiment does not need to have a plurality of fiber array layers orthogonal to each other as described above, and can be formed with only one fiber array layer. This is because only the winding direction needs to generate tension due to winding, and it is not necessary to generate tension in a direction perpendicular to the winding direction. Since tension is generated in the extending direction of the fiber array layer, it is preferable that the winding direction of the electromagnetic wave shielding tape 65 for electric wires coincides with the extending direction of the fiber array layer. The arrows in the figure indicate the fiber drawing direction of the fiber array layer.

  In another embodiment, a base fabric in which a plurality of fiber array layers are orthogonal to each other may be used, and a plurality of fiber array layers are stacked so that the fiber stretching directions are parallel to each other. It may be formed. Further, in the present embodiment, a configuration in which a plurality of covered electric wires are gathered is used, but an electromagnetic wave shielding tape for electric wires is spirally wound around one bare core wire and the upper portion thereof is covered with a jacket. Good. Furthermore, there is no limitation in the kind of electric wire, It can apply to the arbitrary electric wires which an electric current flows and generate | occur | produces a magnetic field, and can shield the electromagnetic waves from an electric wire to the exterior. For example, a power transmission line, a power supply line in a factory, and the like are given as representative examples. Conversely, it can be applied to an electric wire that does not like the influence of electromagnetic waves from the outside, and the adverse effects of the electromagnetic waves from the outside to the electric wires can be suppressed. For example, a high-density signal transmission line is a typical example.

  Next, the manufacturing method of the base fabric 2 demonstrated above is demonstrated. FIG. 7 shows a schematic view of a production apparatus used for producing a fiber array layer constituting the base fabric. The fiber array layer manufacturing apparatus 21 includes a spinning unit 22 mainly composed of a meltblown rice 24 and a conveyor 25, and a stretching unit 23 composed of stretching cylinders 26a and 26b, take-up nip rollers 27a and 27b, and the like. ing. The melt blown rice 24 has a large number of nozzles 28 arranged at the tip (lower end) in a direction perpendicular to the paper surface (only one is shown in the figure). A large number of fibers 31 are formed by the molten resin 30 fed from a gear pump (not shown) being extruded from the nozzle 28. Air reservoirs 32a and 32b are provided on both sides of each nozzle 28, respectively. High-pressure heated air heated to a temperature equal to or higher than the melting point of the resin is fed into the air reservoirs 32a and 32b, and is ejected from slits 33a and 33b communicating with the air reservoirs 32a and 32b and opening at the tip of the melt blown die 24. As a result, a high-speed air flow substantially parallel to the extrusion direction of the fibers 31 extruded from the nozzle 28 is generated. The fiber 31 extruded from the nozzle 28 is maintained in a meltable state that can be drafted by the high-speed airflow, and the fiber 31 is drafted by the frictional force of the high-speed airflow, thereby reducing the diameter of the fiber 31. The temperature of the high-speed airflow is set to 80 ° C. or higher, desirably 120 ° C. or higher, than the spinning temperature of the fiber 31. In the method of forming the fiber 31 using the melt blown rice 24, the temperature of the fiber 31 immediately after being extruded from the nozzle 28 can be made sufficiently higher than the melting point of the fiber 31 by increasing the temperature of the high-speed airflow. Therefore, the molecular orientation of the fiber 31 can be reduced.

  A conveyor 25 is disposed below the melt blown rice 24. The conveyor 25 is wound around a conveyor roller 29 and other rollers that are rotated by a drive source (not shown), and the fibers extruded from the nozzles 28 by driving the conveyor 25 by the rotation of the conveyor roller 13. 31 is conveyed rightward in the drawing.

  The fiber 31 flows along a high-speed airflow that is a flow in which high-pressure heated air ejected from the slits 33a and 33b on both sides of the nozzle 28 is merged. The high-speed air current flows in a direction substantially perpendicular to the conveying surface of the conveyor 25 by the high-pressure heated air ejected from the slits 33a and 33b.

  A spray nozzle 35 is provided between the melt blown rice 24 and the conveyor 25. The spray nozzle 35 sprays mist-like water into a high-speed air stream, whereby the fibers 31 are cooled and rapidly solidified. A plurality of spray nozzles 35b are actually installed, but only one is shown in FIG. The fluid ejected from the spray nozzle 35 is not necessarily required to contain moisture or the like as long as the fiber 31 can be cooled, and may be cold air.

  An elliptical airflow vibration mechanism 34 is provided in a region near the melt blown rice 24 where high-speed airflow is generated by the slits 33a and 33b. The airflow vibration mechanism 34 rotates in the direction of the arrow A around an axis 34a that is substantially orthogonal to the conveyance direction D of the fibers 31 on the conveyor 25, that is, substantially parallel to the width direction of the fiber array layer to be manufactured. Be made. In general, when a wall exists in the vicinity of a high-speed jet of gas or liquid, the jet tends to flow near the direction along the wall surface, which is called the Coanda effect. The airflow vibration mechanism 34 changes the flow direction of the fibers 31 using this Coanda effect. In the case of FIG. 5, when the elliptical long axis of the airflow vibration mechanism 34 coincides with the direction of the high-speed airflow (vertical direction in the drawing), the fibers 31 fall almost vertically toward the conveyor 25. When the airflow vibration mechanism 34 rotates 90 degrees around the axis 34a and the elliptical long axis of the airflow vibration mechanism 34 is orthogonal to the direction of the high-speed airflow, the fibers 31 are in the transport direction D (right side in the figure) of the conveyor 25. At this time, the displacement is maximized. When the airflow vibration mechanism 34 further rotates around the shaft 34a, the position where the fibers 31 drop onto the conveyor 25 periodically moves in the front-rear direction with respect to the transport direction D. In other words, the solidified fibers 31 are accumulated on the conveyor 25 while being swung in the vertical direction, and are partially folded in the vertical direction and continuously collected to form continuous long fibers.

  The fibers 31 collected on the conveyor 25 are transported in the transport direction D by the conveyor 25, nipped by the stretching cylinder 26a and the pressing roller 36 heated to the stretching temperature, and transferred to the stretching cylinder 26b. Thereafter, the fiber 31 is nipped between the stretching cylinder 26b and the pressing rubber roller 37, transferred to the stretching cylinder 26b, and is in close contact with the two stretching cylinders 26a and 26b. In this way, the fibers 31 are sent while being in close contact with the drawing cylinders 26a and 26b, so that the fibers 31 become a web in which the adjacent fibers 31 are fused together while being partially folded in the vertical direction.

  The web obtained by being in close contact with the drawing cylinders 26a and 26b is further taken up by take-up nip rollers 27a and 27b (the take-up nip roller 27b in the subsequent stage is made of rubber). The peripheral speed of the take-up nip rollers 27 a and 27 b is larger than the peripheral speed of the stretching cylinders 26 a and 26 b, whereby the web is stretched in the longitudinal direction and becomes the longitudinally stretched fiber array layer 38. In this way, the stretchability of the filaments can be further improved by stretching the spun web in the machine direction. When the fiber 31 is sufficiently quenched, the fiber 31 having a small stretching stress and a high elongation is formed. This is realized by spraying mist-like water from the spray nozzle 35 as described above and including the mist-like liquid in the high-speed airflow. In the fiber array layer formed by the method described above, the directions of the fibers are aligned in one direction.

  As described above, an additive containing oil and a processing aid are not used in each step of manufacturing the fiber array layer. Specifically, when the fiber 31 is extruded from the nozzle 28 (spinning step), no additive or processing aid containing oil is used. Even in the subsequent steps of collection onto the conveyor 25 and fiber drawing, no additive or processing aid containing oil is used. Therefore, the completed fiber array layer does not contain these additives and processing aids.

  The base fabric 2 described above is completed by sequentially laminating and thermocompression-bonding the fiber array layers thus manufactured so that the fiber directions are orthogonal to each other.

It is sectional drawing of the sheet | seat material which concerns on one Embodiment of this invention. It is a disassembled perspective view of the base fabric shown in FIG. It is a partial disassembled perspective view of the base fabric shown in FIG. It is a schematic sectional drawing of the mobile telephone which used the sheet | seat material of this invention as a sheet | seat material for electromagnetic wave shielding. It is a schematic sectional drawing of the wallpaper which used the sheet | seat material of this invention as an electromagnetic wave shield. It is the schematic of the electric wire using the sheet material of this invention. It is the schematic of the manufacturing apparatus used for preparation of a fiber arrangement | sequence layer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheet material 2 Base cloth 3a, 3b Plating part 12A, 12B, 12C, 12D Fiber arrangement layer 13A, 13B, 13C, 13D Fiber 15A, 15B, 15C, 15D Stretching direction 24 Meltblown rice 28 Nozzle 31 Fiber 41 Mobile phone 42 Housing Body 44 Antenna 45 Substrate 46 Electromagnetic wave shielding sheet material 51 Wallpaper 52 Wallpaper body 53 Electromagnetic wave shielding sheet material 54 Adhesive tape 61 Electric wire 62 Covered electric wire 63 Outer sheath 65 Electromagnetic wave shielding tape for electric wire

Claims (7)

It has a base fabric provided with at least one fiber array layer in which continuous long fibers are stretched substantially linearly in one direction, and the surface of at least one surface of the base fabric is made of the long fibers. are plated in a state of adhering to the surface, the basis weight of the base fabric 5 g / m ² or more, Ru der 60 g / m ² or less, the sheet material.   The base fabric includes a plurality of the fiber arrangement layers, and a part of the fiber arrangement layers and the other fiber arrangement layers are laminated so that the extending directions of the long fibers are different from each other. The sheet material described.   The sheet material according to claim 2, wherein the part of the fiber arrangement layers and the other fiber arrangement layers are laminated so that the drawing directions of the long fibers are orthogonal to each other. The sheet material according to any one of claims 1 to 3 , wherein an adhesive means is provided on one surface of the base fabric. The sheet | seat material for electromagnetic wave shielding which has a sheet | seat material of any one of Claim 1 to 4 . The wallpaper which has the sheet | seat material of any one of Claim 1 to 4 . The electromagnetic wave shielding tape for electric wires which has the sheet | seat material of any one of Claim 1 to 4 .

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