Conductive fiber materials

Abstract

To provide a conductive fiber material having fire retardancy.SOLUTION: A conductive fiber material includes: a fabric having first and second surfaces; a metal layer covered on the thread of the fabric; a first fire retardancy layer laminated on a first surface side of the fabric and including a fire retardant; and a second fire retardancy layer laminated on a second surface side of the fabric and including the fire retardant. Some threads of the fabric are exposed from each fire-resistant layer; in both surfaces of the fabric, either one of the warp or the weft are embossed rather than the other; and at least one of the warp and the weft is not twisted yarn.SELECTED DRAWING: Figure 1

Description

[Technical Field] 【0001】 This invention relates to conductive fiber materials. [Background technology] 【0002】 Conventionally, conductive fiber materials have been proposed that have a metal coating formed on the surface of synthetic fibers and are used as conductive materials such as electromagnetic wave shielding materials and grounding materials. For example, Patent Document 1 discloses a conductive fiber material in which a metal coating is formed on a fabric made of thermoplastic synthetic fiber multifilament yarn having a non-circular cross-section with an average flatness ratio of 1.5 to 5. [Prior art documents] [Patent Documents] 【0003】 [Patent Document 1] Utility Model Registration No. 3070467 Gazette [Overview of the project] [Problems that the invention aims to solve] 【0004】 Incidentally, conductive fiber materials like those described above may burn due to heat depending on the usage environment, so there has been a demand for flame retardancy. The present invention was made to solve the above problem and aims to provide a flame-retardant conductive fiber material. [Means for solving the problem] 【0005】 Item 1. Conductive fiber material, A textile having a first surface and a second surface, A metal layer coated on the yarn of the aforementioned fabric, A first flame-retardant layer containing a flame retardant is laminated on the first surface side of the aforementioned fabric, A second flame-retardant layer containing a flame retardant is laminated on the second surface side of the aforementioned fabric, Equipped with, A portion of the threads of the fabric is exposed from each of the flame-retardant layers. On both sides of the fabric, either the warp or the weft protrudes more than the other. A conductive fiber material in which at least one of the warp and the weft is not a twisted yarn. 【0006】 Item 2. The application amount of each of the flame-retardant layers is 15 to 80 g / m 2 The conductive fiber material according to Item 1, which is as described above. 【0007】 Item 3. The conductive fiber material according to Item 1 or 2, in which both the warp and the weft are not twisted yarns. 【0008】 Item 4. The conductive fiber material according to any one of Items 1 to 3, in which the height by which either the warp or the weft protrudes more than the other is 20 to 50 μm. 【0009】 Item 5. The conductive fiber material according to any one of Items 1 to 4, in which the waviness height of either the warp or the weft is greater than the waviness height of the other. 【Advantages of the Invention】 【0010】 According to the present invention, a conductive fiber material having flame retardancy can be provided. 【Brief Description of the Drawings】 【0011】 [Figure 1] It is a cross-sectional view of an embodiment of the conductive fiber material according to the present invention. [Figure 2] It is an enlarged cross-sectional view of FIG. 1. [Figure 3] It is an enlarged cross-sectional view of a cross-section different by 90 degrees from FIG. 2. [Figure 4] It is a photograph of the surface of Example 1. [Figure 5] It is a photograph of the cross-section of Example 1. [Figure 6] It is a photograph of the cross-section of Example 1 different from FIG. 5. [Figure 7] It is a photograph of a cross-section different by 90 degrees from FIG. 6. 【Modes for Carrying Out the Invention】 【0012】 Hereinafter, an embodiment of the conductive fiber material according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of the conductive fiber material according to this embodiment. As shown in FIG. 1, this conductive fiber material includes a fabric 1 having a first surface and a second surface, a metal layer coated on the yarns of this fabric 1, a first flame-retardant layer 2 laminated on the first surface side of the fabric 1, and a second flame-retardant layer 3 laminated on the second surface side of the fabric 1. Note that FIG. 1 schematically shows a form in which a part of the fabric 1 is exposed, and does not precisely show the shapes of both flame-retardant layers 2 and 3. Hereinafter, these members will be described in detail. 【0013】 <1. Fabric> The yarn used for the fabric 1 of the present invention is preferably a yarn mainly composed of polyester filament in consideration of processability and durability. All the yarns may be composed of polyester, but synthetic fibers such as polyamide, acrylic, and polyolefin, regenerated fibers such as rayon, and semi-synthetic fibers such as acetate may also be used. Alternatively, a plurality of the above-described fibers may be processed by blending, interlacing, twisting, etc. The yarn used is not particularly limited, but for example, it is preferable to use a multifilament having a total fineness of 33 to 220 dtex, and a multifilament of 56 to 84 dtex is more preferable. 【0014】 The thickness of the fabric 1 is not particularly limited, but for example, it is preferably 40 to 250 μm, and more preferably 60 to 200 μm. If the thickness of the fabric 1 is less than 40 μm, the strength may not be sufficient. On the other hand, if the thickness exceeds 250 μm, the thickness becomes large, making it difficult to use in lightweight and compact electronic devices, and it is not economically preferable. Also, if the thickness of the fabric 1 is large, it may also affect the stiffness and softness described later. Note that the thickness of the fabric material can be measured by a thickness gauge (for example, manufactured by Ozaki Seisakusho Co., Ltd., Peacock G-6). Also, the thickness is obtained by performing measurements at 10 locations, excluding the maximum and minimum values, and calculating the average value at the remaining 8 locations. 【0015】 Generally, woven fabrics do not have a structure where one warp thread sinks and the other floats; the floating height is often close to zero. However, in this invention, as shown in Figure 2, it is preferable to set the floating height X to 20 μm to 70 μm, and particularly to 30 to 50 μm. If the floating height is less than 20 μm, the amount of resin containing the flame retardant that can be coated will be small, and if the floating height is greater than 70 μm, the weaving properties of the fabric may deteriorate. The floating height is determined by taking measurements at 10 locations and calculating the average value at the remaining 8 locations after excluding the maximum and minimum values. 【0016】 As shown in Figure 2, the floating height X refers to the difference in surface height between the warp threads (floating threads in this case) 12 and the weft threads (sinking threads in this case) 11 when the fabric 1 is cut perpendicular to the surface and viewed from the cross-sectional direction. To produce a fabric 1 with such a floating height X, the tension during weaving, scouring, and heat setting, as well as the thickness of the warp and weft threads, can be changed to similarly shrink one thread more than the other, or to make the thread thicker, thereby creating the floating height. For example, if the fabric is scoured while being stretched during the scouring process, and the tension is also increased during the subsequent heat setting, the floating height will be small. Conversely, if one of the warp or weft threads is not stretched as much as possible during scouring and heat setting, a fabric with a large floating height can be produced. Furthermore, two or more of the above three methods (high tension, high shrinkage, thick thread) can be combined to further increase the floating height X. Note that there is no particular limitation on whether the warp threads 12 or the weft threads 11 are floating threads or sinking threads; either is acceptable. 【0017】 Furthermore, in the fabric 1 according to this embodiment, the difference in undulation between the warp threads 12 and the weft threads 11 can also be increased. Figure 3 is a cross-sectional view of a plane that intersects Figure 2 at a 90° angle. As shown in Figures 2 and 3, in this embodiment, the thickness (undulation height) A due to the warp threads 12 and the thickness (undulation height) B due to the weft threads 11 of the fabric 1 are different. In this example, the undulation height of the warp threads 12 is greater than the undulation height of the weft threads 11. This difference in undulation height (|AB|) is preferably 20 to 140 μm, more preferably 50 to 130 μm, and even more preferably 65 to 120 μm. The same method as the method for setting the floating height X described above can be used to set such a difference in undulation height. The measurement method can also be the same as that for the floating height. 【0018】 <2. Metal layer> Examples of metals that can constitute the metal layer include gold, silver, copper, zinc, nickel, and alloys thereof. Of these, copper and nickel are preferred when considering conductivity and manufacturing cost. The metal layer formed by these metals is preferably constructed by laminating one or two layers of metal. Laminating three or more layers of metal may result in a thicker metal layer and harden the conductive fiber material. There is also the problem of increased processing costs. When constructing the metal layer with two layers, the same type of metal may be used for both layers, or different metals may be laminated. These can be appropriately set considering the required shielding performance and durability. 【0019】 The metal layer can be applied to the yarn of the fabric 1 by methods such as vapor deposition, sputtering, electroplating, or electroless plating. Of these, electroless plating, or a combination of electroless plating and electroplating, is preferred from the viewpoint of uniformity of the formed metal layer and productivity. The amount of metal layer applied is, for example, 5 to 50 g / m². 2 Preferably, it is 10-40 g / m 2 It is even more preferable that the amount be 15-30 g / m 2 It is particularly preferable that the coating amount be 5 g / m². 2Using less coating may impair surface conductivity and electromagnetic shielding properties. On the other hand, a coating of 50 g / m² is appropriate. 2 Using too much of it may result in a harder texture and higher costs. 【0020】 For example, when coating one side of fabric 1 with metal by sputtering or other methods, the metal used to coat the first and second surfaces may be the same or different. 【0021】 <3. Flame-retardant layer> The first flame-retardant layer 2 and the second flame-retardant layer 3 contain a thermoplastic resin and a flame retardant. Examples of thermoplastic resins include urethane resin, acrylic resin, and ester resin. Of these, urethane resin is preferred because it is superior to acrylic resin and ester resin in terms of flame retardant effect, friction strength, and flexibility. Among urethane resins, ester-based urethane that does not yellow easily is preferred in terms of durability and cost-effectiveness. In these urethane resins, aromatic isocyanates such as diphenylmethane diisocyanate (MDI) and tolylene diisocyanate (TDI) are preferably used as isocyanates, and polyester-based diols consisting of aliphatic carboxylic acid and glycol components are preferably used as polyols. 【0022】 Examples of flame retardants that can be used in the present invention include halogen-based flame retardants, phosphorus-based flame retardants, and antimony trioxide. When halogen-based and phosphorus-based flame retardants are used in combination, they exhibit an excellent flame retardant effect due to a synergistic effect, and antimony trioxide enhances this synergistic effect. Therefore, a mixture of these three is preferably used. 【0023】 Halogenated flame retardants that can be used in the present invention are broadly classified into brome-based flame retardants and chlorine-based flame retardants, but in the present invention, it is preferable to use brome-based flame retardants. Furthermore, brome-based flame retardants are classified into organic brome compounds and inorganic brome compounds, and in the present invention, it is particularly preferable to use organic brome compounds. An organic brome compound is an organic compound substituted with one or more bromine atoms. However, phosphate esters containing one or more bromine atoms are excluded. Examples of organic brome compounds include hexabromobenzene, hexabromobisphenyl ether, tribromophenol, decabromodiphenylethane, Pigallol SR103 (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), Pigallol SR700 (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), etc. In the present invention, hexabromobenzene and hexabromobisphenol are preferred organic brome compounds. 【0024】 Furthermore, considering recent environmental concerns, the above-mentioned organic brome compounds other than decabromodiphenylethane are more preferable. 【0025】 Phosphorus-based flame retardants are classified into inorganic phosphates, nitrogen-containing phosphorus compounds, non-halogen phosphate esters, halogen-containing phosphate esters, etc. Examples of inorganic phosphates include ammonium polyphosphate. Examples of nitrogen-containing phosphorus compounds include phosphophotonitrile chloride derivatives and phosphonoamide compounds. 【0026】 Examples of non-halogenated phosphate esters include trimethyl phosphate, triethyl phosphate, tributyl phosphate, trioctyl phosphate, tributoxyethyl phosphate, triphenyl phosphate, tricresyl phosphate, cresyl diphenyl phosphate, and octyl diphenyl phosphate. Furthermore, halogenated phosphate esters are phosphate esters containing one or more halogen atoms (including bromine atoms) in a single molecule. Bromine or chlorine atoms are preferred as halogen atoms. The halogen and phosphorus atoms work synergistically to exhibit a strong flame-retardant effect. Examples of halogenated phosphate esters include tris(chloroethyl) phosphate, tris(dichloropropyl) phosphate, tris(chloropropyl) phosphate, bis(2,3-dibromopropyl)2,3-dichloropropyl phosphate, tris(2,3-dibromopropyl) phosphate, and bis(chloropropyl)monooctyl phosphate. 【0027】 In the present invention, tris(chloroethyl) phosphate and bis(chloropropyl) monooctyl phosphate can be preferably used. Furthermore, in the present invention, phosphate esters substituted with one or more bromine atoms are classified as halogenated phosphate esters. In the present invention, it is preferable to use non-halogenated phosphate esters or halogenated phosphate esters. 【0028】 The ratio of flame retardants to thermoplastic resin by weight is 200-400%, preferably 300-350%, of organic brome compounds, 50-150%, preferably 80-120%, of phosphate esters, and 60-170%, preferably 100-150%, of antimony trioxide. Higher ratios result in a brittle resin coating, while lower ratios do not provide sufficient flame retardancy. Remarkable flame retardancy can be achieved by combining these three flame retardants: organic brome compounds, phosphate esters, and antimony trioxide. This is because a particularly excellent synergistic effect is obtained by using these three flame retardants in combination. 【0029】 For each of the flame-retardant layers 2 and 3, other additives can be blended within a range that does not inhibit their performance for the purpose of imparting functions such as coloring, texture adjustment, insulation, etc. Specific examples of such additives include elastomers such as silicone rubber, olefin copolymers, modified nitrile rubber, and modified polybutadiene rubber, thermoplastic resins such as polyethylene, and pigments. 【0030】 The application amount of each of the flame-retardant layers 2 and 3 is preferably 15 to 80 g / m 2 and more preferably 20 to 60 g / m 2 If the application amount is less than 15 g / m 2 there is a risk that sufficient flame retardancy cannot be obtained. On the other hand, if the application amount is more than 80 g / m 2 there is a risk that the surface conductivity will be impaired and the cost will increase. 【0031】 The method of laminating each of the flame-retardant layers 2 and 3 is not particularly limited, and examples thereof include a padding method, a coating method, and a lamination method. By such a method, the viscosity of each of the flame-retardant layers 2 and 3 can be appropriately adjusted. Also, the first flame-retardant layer 2 and the second flame-retardant layer 3 may be formed of the same material or different materials. 【0032】 <4. Applications of the Conductive Fiber Material> The conductive fiber material according to the present embodiment can be used for covers of cables of electronic devices, shield covers, shield cases, shield curtains, shield tapes, etc. 【0033】 <5. Features> The conductive fiber material according to the present embodiment can obtain the following effects. (1) Since at least one of the warp 12 and the weft 11 of the fabric 1 is not twisted, the flame-retardant layers 2 and 3 can penetrate between the fibers constituting the yarn. Therefore, a high degree of flame retardancy can be obtained. 【0034】 (2) Since at least one of the warp threads 12 and weft threads 11 of the fabric 1 is not twisted, the flexibility of the fabric 1 is increased. Therefore, for example, as will be described later, it becomes easier to wrap conductive fiber material around the cable, and workability is improved. 【0035】 (3) The flame-retardant layers 2 and 3 are laminated so that a portion of the fabric 1 is exposed to the outside. In other words, the entire surface of the fabric 1 is not covered with the flame-retardant layers 2 and 3, so flexibility can be ensured. On the other hand, in order for the flame-retardant layers 2 and 3 to be firmly laminated on the surface of the fabric 1, irregularities are formed on the surface of the fabric 1 so that the flame-retardant layers 2 and 3 are laminated in the recesses. The irregularities are obtained by forming the floating height X described above. In addition, irregularities can also be formed by creating differences in undulation height. 【0036】 Furthermore, the percentage of the surface area where the warp threads 12 and weft threads 11 of the fabric 1 are exposed on the surface of the conductive fiber material is preferably, for example, 20 to 60%. The percentage of the exposed area can be determined, for example, by printing a photograph and separating it into the flame-retardant layers 2 and 3 and the uncoated areas, and then determining the percentage from their weight ratio, or by reading the image from image software and determining the percentage of the area where the flame-retardant layers 2 and 3 are not laminated. Alternatively, the percentage of the area on the first surface and the second surface of the conductive fiber material can be determined separately, and the average of these percentages can be used as the percentage of the exposed area. [Examples] 【0037】 The following describes embodiments of the present invention. However, the present invention is not limited to the following embodiments. 【0038】 <1. Preparation of Examples and Comparative Examples> The conductive fiber materials for Examples 1-3 and the comparative example were prepared as follows. 【0039】 (Example 1) Polyester processed yarn with a density of 84 dtex / 36 f was used for both the warp and weft threads. The processed yarn used was untwisted and heated by two heaters. The warp threads were sized before warping. As a result, a plain weave fabric with a warp density of 86 threads / 25.4 mm, a weft density of 82 threads / 25.4 mm, and a fabric thickness of 85 μm was obtained. The fabric was then scoured, dried, and heat-treated. The buoyancy and undulation heights of the fabric were adjusted as shown in Table 1 below. This fabric was then immersed for 2 minutes in a 40°C aqueous solution containing 0.3 g / L palladium chloride, 30 g / L stannous chloride, and 300 ml / L 36% hydrochloric acid, followed by rinsing with water. 【0040】 Next, the samples were immersed in 0.1N hydrobolic acid at 30°C for 5 minutes and then rinsed with water. Then, they were immersed in an electroless copper plating solution at 30°C containing 7.5g / L copper sulfate, 30ml / L 37% formalin, and 85g / L Rochelle salt for 5 minutes and then rinsed with water. Finally, they were plated for 10 minutes in an electroplated nickel solution at pH 3.7 and 35°C containing 300g / L nickel sulfamate, 30g / L boric acid, and 15g / L nickel chloride, at a current density of 5A / dm². 2 After immersion and layering of nickel, it was washed with water. 【0041】 The yarn for the fabric contains 10g / m of copper. 2 Nickel contains 4 g / m² 2 However, the plating was carried out in this order. In this way, the threads of the fabric were coated with a metal layer. The basis weight of the resulting metal-coated fabric was 64 g / m 2 Next, the mixed treatment solution of Formulation 1 described below was coated onto both sides of the metal-coated fabric using a knife and dried at 130°C for 2 minutes to form a flame-retardant layer. The total amount applied to each side was 50 g / m² in solid content. 2 That was the case. 【0042】 (Prescription 1) Chrisbon 2016EL (Urethane resin manufactured by DIC Corporation) 100 units Bigor Bui-854 (manufactured by Daikyo Chemical Co., Ltd.; bromine-based compound, antimony trioxide, chlorine-based compound phosphate ester) 160 units The viscosity was adjusted to 8000 mPa·s by adding N,N-dimethylformamide to the above mixture. A Tokyo Keiki Seisakusho Type B viscometer was used as the viscometer (rotor number 4, rotation speed 30 rpm). This was also the case for the viscosity described later. 【0043】 (Example 2) The differences between Example 2 and Example 1 are the floating height and undulation height of the fabric shown in Table 1, the amount of flame retardant layer applied, and the presence of twist in the warp threads. Other aspects are the same, so a detailed explanation is omitted. In Example 2, the amount of flame retardant layer applied was 40 g / m² in terms of solid content. 2 That's what I decided. 【0044】 (Example 3) The differences between Example 3 and Example 1 are the floating height and undulation height of the fabric shown in Table 1, and the presence of twist in the warp threads; otherwise, they are the same, so we will omit the explanation. 【0045】 (Comparative example) The comparative example differs from Example 1 in the floating height and undulation height of the fabric shown in Table 1, the amount of flame retardant layer applied, and the use of twisted yarn for the warp and weft. Other than these differences, the explanation is omitted. In the comparative example, the amount of flame retardant layer applied is 13 g / m² in solid content. 2 That was the case. 【0046】 <2. Evaluation of Examples and Comparative Examples> The examples and comparative examples prepared as described above were evaluated as follows. (1) Bending resistance Measurements were taken in accordance with JIS-L-1096:2010 (8.21.1 Method A (45° cantilever method)). Here, measurements were taken with the first surface facing upwards and with the second surface facing downwards. 【0047】 (2) Flame retardant The evaluation was performed using a method equivalent to the UL94 VTM-0 method. 【0048】 (3) Conductivity Using a resistance meter (Rolestar MP, manufactured by Mitsubishi Chemical Analytech Co., Ltd.), the surface resistance values ​​of the first and second surfaces were measured using the four-terminal, four-probe measurement method (JIS-K-7194) (unit: Ω / □). A surface resistance value of 1 Ω / □ or less was considered to indicate conductivity. 【0049】 (4) Back leakage of resin When resin was applied to one side of a conductive fiber material, the degree of resin leakage from the other side of the conductive fiber material was visually determined. 1: No resin leakage from the back. 2: Slight leakage from the back. 3: There is a lot of resin leakage from the back. 【0050】 (5)Flexibility Examples 1-3 and the comparative example were cut to a length of 1m in the warp direction and 20cm in the weft direction. Ten cables with a diameter of 5mm and a length of 1.2m were prepared, and the cables were placed parallel to the warp direction of Examples 1-3 and the comparative example. The cables were then wound in the weft direction to check the ease of winding. 1: Easy to wrap and the fabric does not stretch out at all. 2: It's easy to wrap, but the fabric tends to spring back a little. 3: It's difficult to wrap around, and the fabric tends to return to its flat state. 【0051】 (6)Exposed area The ratio of the area of ​​the warp and weft threads exposed from the flame-retardant layer to the surface area of ​​the conductive fiber material was determined. The method for calculating the ratio of the exposed area is as described above. 【0052】 The results of the above evaluation are as follows: [Table 1] 【0053】 According to Table 1, in Examples 1-3, at least one of the warp and weft threads is not twisted, allowing the flame-retardant layer to penetrate the fibers of the fabric. Therefore, flame retardancy can be reliably ensured. In addition, in Examples 1-3, a difference in the floating height and undulation height of the fabric is formed, which also helps to retain the flame-retardant layer on the surface of the fabric. On the other hand, in the Comparative Example, the threads of the fabric are twisted, and a difference in the floating height and undulation height of the fabric is not formed, resulting in a smaller amount of flame-retardant layer being applied. As a result, the flame retardancy fails. Furthermore, because twisted threads are used, there are gaps between the threads in the fabric, causing resin leakage. 【0054】 Furthermore, while resin leakage from the back is mainly caused by the density and thickness of the warp and weft threads of the conductive fiber material, the presence or absence of twist in the threads also plays a role, as mentioned above. The inventors have confirmed that, with the same density configuration, twisted threads are more prone to creating gaps between the threads compared to untwisted threads, and resin leakage (back leakage) tends to occur from these gaps. 【0055】 The yarn in the comparative example fabric is twisted, resulting in low flexibility. Furthermore, Example 1 uses untwisted yarn for both the warp and weft, thus exhibiting lower flexibility compared to Examples 2 and 3, as well as the comparative example. 【0056】 In Example 3, the floating height is greater compared to Example 2. Therefore, even if the amount of flame-retardant layer applied is the same, the resin forming the flame-retardant layer is more likely to catch on the unevenness of the surface of the fabric, resulting in a larger exposed area. 【0057】 Figure 4 is a photograph of the surface of Example 1. In this figure, the surface of the fabric coated with a metal layer is exposed, but a flame-retardant layer is laminated near the boundary between the floating and sinking threads. 【0058】 Figure 5 is a photograph of a cross-section of Example 1. Figure 5 shows the difference in height between the floating and sinking threads of the fabric. 【0059】 Figure 6 is a photograph of a cross-section of Example 1, which is different from Figure 5, and Figure 7 is a photograph of a cross-section rotated 90 degrees from Figure 6. Figures 6 and 7 clearly show the difference in the undulation of the warp and weft threads. 【0060】 In addition, in Examples 2 and 3, similar to Example 1, the difference in height between floating and sinking threads, and the difference in undulation of the fabric, were confirmed. [Explanation of Symbols] 【0061】 1 textile 2. First flame-retardant layer 3. Second flame-retardant layer

Claims

[Claim 1] A conductive fiber material, A fabric having a first surface and a second surface, A metal layer coated on the yarn of the aforementioned fabric, A first flame-retardant layer containing a flame retardant is laminated on the first surface side of the aforementioned fabric, A second flame-retardant layer containing a flame retardant is laminated on the second surface side of the aforementioned fabric, Equipped with, A portion of the threads of the fabric is exposed from each of the flame-retardant layers. On both sides of the aforementioned fabric, one of the warp threads or the weft threads is raised higher than the other. The height at which either the warp thread or the weft thread protrudes more than the other is 30 to 50 μm. The difference in undulation height (|A-B|) between the undulation height A caused by the warp threads and the undulation height B caused by the weft threads is 50 to 130 μm. A conductive fiber material in which at least one of the warp threads and the weft threads is not a twisted yarn. [Claim 2] The amount of each flame retardant layer applied is 15 to 80 g / m². 2 The conductive fiber material according to claim 1. [Claim 3] The conductive fiber material according to claim 1 or 2, wherein both the warp and weft threads are not twisted yarns.

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