JP4635674B2 - Conductive fabric and method for producing the same - Google Patents

Description

The present invention relates to a conductive fabric having a high electrical conductivity and a stable electrical conductivity, and excellent in durability (corrosion resistance), in which carbon fiber yarns and metal wires are interwoven.
More specifically, the present invention relates to a method for producing a conductive fabric capable of suppressing the disorder of arrangement and bending of carbon fibers and metal wires and obtaining a conductive fabric excellent in straightness with high productivity.

Conventionally, carbon fiber reinforced plastics (hereinafter abbreviated as CFRP) using carbon fiber yarns as reinforcing fibers are excellent in specific strength and specific elastic modulus. . However, when these CFRPs are used as, for example, aircraft members, there is a problem in that the portion is greatly damaged when a lightning strike occurs in flight or the like as compared with a metal material. This is considered to be mainly due to the inferior conductivity of CFRP compared to metal materials, and the inability to instantaneously diffuse current.
As a means for improving the conductivity of the CFRP aircraft member for this problem, for example, Patent Document 1 discloses a technique in which a metal thin plate or the like is bonded to the surface of the CFRP member. However, this technique has a problem that the manufacturing cost of the member is increased because the number of steps of attaching the metal thin plates is increased.

  On the other hand, as a means for improving the conductivity of aircraft members, there is a technique that uses a conductive fabric having a metal wire inserted therein. When such a conductive fabric is used, current flows preferentially through the metal wire inserted during a lightning strike and diffuses over a large area along the CFRP surface to release electricity to other parts of the member or discharge into the atmosphere. Damage to the structure can be prevented. In addition, there is a feature that the manufacturing cost problem is solved because an extra process does not increase in the manufacture of the member.

  However, when inserting metal wires in conductive fabrics, simply interweaving metal wires and carbon fibers results in inferior straightness due to meandering, bending, twisting, etc. of the metal wires, and the metal wires are not interlaced. There were many problems that occurred. In such a conductive fabric, not only the current diffusion path is reduced and the conductivity is not improved, but also the width of the carbon fiber in the woven yarn is narrowed, the cover factor of the conductive fabric is reduced, or the carbon fiber is bent. As a result, there are problems that the mechanical properties when CFRP is used are deteriorated and the surface quality is inferior.

In the production of conductive fabrics, for example, when a metal wire in the horizontal direction is inserted into a conductive fabric having a plain weave structure using a rapier loom, the cross-sectional areas of the carbon fiber yarns in the horizontal direction and the metal wire are different. Therefore, it is difficult to grip two fibers with a rapier at the same time, and there is a problem that the thin metal wire is easily pulled out and a gripping error is likely to occur, resulting in poor productivity.
In order to solve such a problem, there is also a proposal that the carbon fiber yarns and metal wires in the weft direction are individually driven, but the weaving speed is reduced and a complicated device such as a weft switching device is required. There was a problem that the manufacturing cost of the conductive fabric was increased.
In other words, conventional conductive fabrics with metal wires inserted are capable of producing composite materials with excellent conductivity and surface quality with good productivity, and materials with excellent quality stability have not been proposed. Realization is desired.
JP 2001-088793 A

  By solving the above-mentioned problems and suppressing the meandering, bending, and twisting of the metal wire inserted into the carbon fiber fabric, the crossing point of the metal wire in the vertical direction and the metal wire in the horizontal direction (definition will be described later). Is to provide a conductive fabric excellent in conductivity and quality and a method for producing the same.

In order to achieve the above object, the conductive fabric of the present invention is a conductive fabric in which carbon fiber yarns are arranged in at least two directions including a warp direction and a weft direction, and includes at least a warp direction and a warp direction. Metal wires are arranged in parallel with the carbon fiber yarns in the transverse direction, and the metal wires in the warp direction at any 25 cm ² on the plane and the metal wires in the transverse direction are crossed with each other at 70% or more, and The cover factor of the conductive fabric is 90 to 100%.

In order to realize the above characteristics, the present invention takes at least the following means. That is, in the method for producing a conductive fabric of the present invention, the carbon fiber yarns are arranged in at least two directions including the warp direction and the weft direction, and the weight per unit length is the fineness of the carbon fiber yarns. A conductive woven fabric in which a metal wire of 1/5 or less is inserted, and is woven through the following steps (A) to (C).
Step (A): Warp yarn drawing step for supplying warp-direction carbon fiber yarns and metal wires in a state of being aligned using different guides (B): Carbon fiber yarns and metal in the transverse direction When the rapier grips the wire, arrange the metal wire inside the carbon fiber yarn while gripping the rapier hook. Weft driving process step (C) for driving into the mouth: Weaving process in which the metal wires in the warp direction and the metal wires in the weft direction at an arbitrary 25 cm ² on the plane intersect each other at 70% or more

  According to the present invention, it is possible to obtain a conductive fabric excellent in straightness by suppressing disturbance and bending of the metal wire with a conductive fabric in two or more directions into which a metal wire is inserted. There can be many intersections with metal lines in the horizontal direction. As a result, it is possible to provide a conductive fabric capable of obtaining a composite material excellent in conductivity, mechanical properties and surface quality with high productivity.

  Hereinafter, an exemplary embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic view showing an embodiment of the conductive fabric of the present invention.
As shown in FIG. 1, in the conductive fabric 5, the warp yarn 1 and the weft yarn 3 each composed of carbon fiber yarns are interlaced in a plain weave structure, and a metal wire 2 in the warp direction is interposed between the warp yarns 1. Are arranged, and between the respective weft yarns 3, weft-direction metal wires 4 are arranged. In the conductive fabric of FIG. 1, the carbon fiber yarns constituting the fabric and the metal wires adjacent thereto are crossed with the same woven structure. The fabric of this aspect can be manufactured with excellent productivity because the carbon fiber yarns in the weft direction and the metal wire adjacent thereto can be simultaneously driven into the shed. In the present invention, the two-way conductive fabric means one in which a woven structure is formed using carbon fiber yarns in both the warp direction and the weft direction.

The conductive fabric of the present invention is a conductive fabric in which carbon fiber yarns are arranged in at least two directions including the warp direction and the weft direction, and the metal wires are at least in the warp direction and the weft direction. The metal wires in the vertical direction at an arbitrary 25 cm ² on the plane and the metal wires in the horizontal direction are crossed with each other at 70% or more. By crossing more metal wires 2 in the vertical direction and metal wires 4 in the transverse direction, there are many current diffusion paths through the metal wires, and high conductivity can be expressed. That is, it is important to provide more intersection points between metal wires in order to develop excellent conductivity when formed into CFRP.

  In order to increase the number of crossing points, as a more preferable aspect in the present invention, the carbon fiber yarns 1 and the metal wires 2 are alternately arranged in the warp direction, and the carbon fiber yarns are arranged in the width direction of the conductive fabric. 3 and metal wires 4 are alternately arranged. From another viewpoint, there is an embodiment in which the metal wires are arranged along the gap between the carbon fiber yarns in the warp direction and the weft direction. In such an embodiment, it is important that the metal wire is inserted straight.

  The crossing point as used in the present invention refers to a carbon fiber yarn that impairs the conductivity of the metal wire between the metal wire in the vertical direction and the metal wire in the transverse direction at the location where the metal wires intersect and overlap each other. This refers to a location where there is no foreign matter such as a strip. More specifically, even if the metal wire in the vertical direction and the metal wire in the transverse direction are in contact with each other, or even in a state where they are not in contact with each other, when the fabric is pressed in the thickness direction, it is in direct contact. If it is in an unsatisfactory state, the intersection is taken as the intersection.

In the crossing point of the metal wire 2 in the vertical direction and the metal wire 4 in the transverse direction in the present invention, 10 test pieces having a size of 5 × 5 cm are cut out in the width direction of the fabric, and the following formula is used from each test piece. The percentage of crossing points was calculated, and the average value of the crossing ratios of 10 sheets was taken as the crossing ratio of the conductive fabric.
Crossing rate (%) = (number of crossing points of metal wires) / (number of overlapping metal wires in the entire test piece) × 100
Here, the number of metal wires crossed can be counted by placing a fabric on a movable stage using a microscope and peeking at a magnification of, for example, 50 times.

  The conductive fabric of the present invention may be a multidirectional fabric in which carbon fiber yarns are arranged in three or more directions. Examples of such multidirectional woven fabrics include triaxial woven fabrics and three-dimensional woven fabrics. In that case, the problem of the present invention can be solved even if the metal wires are arranged in parallel with the carbon fibers in directions other than the vertical direction and the horizontal direction.

FIG. 2 is a schematic view showing another embodiment different from the fabric of FIG.
In FIG. 2, the carbon fiber yarns constituting the conductive fabric 10 and the metal wires adjacent thereto are interlaced with different woven structures. At this time, a mode in which the carbon fiber yarns 1 in the vertical direction and the carbon fiber yarns 3 in the transverse direction are arranged so that the numbers of ups and downs are the same on the front and back sides of the woven fabric is the same when the front and back sides are formed into CFRP. This is a preferred embodiment of the present invention. In the case of fabrics with different numbers of ups and downs on the front and back of the fabric, when CFRP is formed, the orientation of the carbon fibers becomes asymmetric when viewed from the center plane of the thickness of the fabric. However, warping may occur, and care must be taken to use the front and back.

  The woven fabric composed of the woven structure is different in the ups and downs of the carbon fiber yarns 1 and 3 and the metal wires 2 and 4, so that the metal wire 2 is always between the carbon fiber yarns 1 and the metal wire 4 is always Since the carbon fiber yarns 3 are disposed between each other, the carbon fiber and the metal wire do not overlap with each other, and there are many intersecting portions of the vertical metal wire 2 and the horizontal metal wire 4. Therefore, it can be said that the woven structure is more advantageous for conductivity.

FIG. 3 is a schematic view showing another embodiment different from the fabric of FIGS. 1 and 2.
The woven structure of the conductive fabric 11 in FIG. 3 intersects with each of these two yarn groups in a state where the carbon fiber yarn groups in the warp direction intersect with the carbon fiber yarn groups in the transverse direction without bending each other. It is a non-crimp fabric in which the carbon fiber yarns 1 in the warp direction and the carbon fiber yarns 3 in the transverse direction are integrally held by being woven with the metal wires. In the woven fabric of FIG. 3, since the carbon fiber yarn does not have a bend, the excellent mechanical properties such as high strength and high elastic modulus of the carbon fiber itself can be used as they are.
Further, the fabric shown in FIG. 3 has a vertical metal wire 2 and a transverse metal wire 4 which are in direct contact with each other, so that it has excellent conductivity without being affected by bending or meandering of the metal wire. Sex can be expressed.

FIG. 4 is a schematic view showing another embodiment of the non-crimp fabric of FIG.
Similar to the woven fabric of FIG. 2, the carbon fiber yarns and the adjacent metal wires have different woven structures, so that they have the same electrical conductivity as that of FIG. 2 and the above-mentioned mechanical properties of the non-crimp fabric.

The conductive fabric of the present invention has a cover factor in the range of 90 to 100%. More preferably, it is 92 to 99% of range. When the cover factor is less than 90%, when molded into CFRP, the space where no carbon fiber yarns or metal wires are present becomes resin-rich, and when stress concentration occurs, it tends to be a starting point of fracture. However, if the cover factor exceeds 99%, carbon fiber yarns can easily enter between the metal wires in the vertical direction and the metal wires in the transverse direction at the intersection of the metal wires, impairing the conductivity of the metal wires. Care should be taken because it may be possible.
Here, the cover factor is an element related to the gap formed between the woven yarns (carbon fiber yarns and metal wires) of the woven fabric. When the region of the woven fabric area S1 is set, the cover factor is formed by the woven yarn within the area S1. When the area of the void portion to be formed is S2, it is a value defined by the following equation. In the embodiment of the present invention, the area S1 is an arbitrary 100 cm ² on the plane of the conductive fabric, and the cover factor is 5 pieces of 10 × 10 cm test pieces cut in the width direction of the fabric. The average of individual values measured from
Cover factor (%) = [(S1-S2) / S1] × 100
In order not to reduce the cover factor, it is important to arrange the metal wires while suppressing the meandering, bending and twisting of the metal wires. If the metal wire is inserted in a state where meandering, bending, and twisting occur, the width of the carbon fiber yarns arranged along the metal wire becomes narrow, so that the cover factor is lowered and excellent mechanical properties cannot be expressed.

  From this point of view, the vertical and transverse metal wires are carbon fiber yarns, with the end of the closest carbon fiber yarn arranged in parallel with the metal wires as the reference line. It is preferable to arrange within a range of 0.05 mm in the direction of the center of the strip and within 0.5 mm in the opposite direction.

  Moreover, it is preferable that the weight per unit length of this metal wire is 1/5 or less of the fineness of a carbon fiber yarn. If the weight per unit length of the metal wire exceeds 1/5 of the fineness of the carbon fiber yarn, the draping property of the conductive fabric is lost and the handling property is inferior. Squeezes and may lead to a decrease in the cover factor.

  Further, in order to combine the excellent conductivity and durability (corrosion resistance) of the present invention, the conductivity at 293K (% IACS, IACS is an abbreviation of International Annealed Copper Standard) is standard for metal wires. It is preferable to use one having a range of 40 to 100% with respect to copper and a standard electrode potential of the main metal element used for the metal wire in the range of −1 to + 1V. Here, the main component refers to one component which is the largest among the components constituting the metal wire.

  Among the metal wires having the above characteristics, a phosphor bronze single wire is particularly preferable because of its excellent balance of conductivity, corrosion resistance and price.

  The conductive fabric of the present invention preferably has a volume resistivity of 0.07 Ω · cm or less in the direction of 45 ° with respect to the carbon fiber yarn 3 in the weft direction. If the volume resistivity at 45 ° exceeds 0.07 Ω · cm, the partial damage during lightning strike is so great that the effects of the present invention may not be fully exhibited.

  In addition, although an example of the measuring method about the volume specific resistance in the direction whose angle with respect to the carbon fiber yarn of the weft direction of the textile fabric in this invention is 45 degrees is demonstrated with reference to FIG. 8 and FIG. It is not limited.

  FIG. 8 is a schematic view showing a position where a test piece of volume resistivity is cut out from the conductive fabric of the present invention.

  A cuboid shape (length 70 mm × width 12.7 mm × thickness 0) from a woven fabric 5 in an absolutely dry state (moisture content of 0.005% by weight or less) with a 45 ° angle as a longitudinal direction with respect to the carbon fiber yarn in the weft direction Cut out to 33 mm (22 in FIG. 8).

FIG. 9 is a schematic view illustrating a test piece for measuring the volume resistivity in the direction of 45 ° with respect to the carbon fiber yarns in the weft direction of the conductive fabric of the present invention.
The test piece 24 is obtained by applying the conductive paste 23 to both ends (width × thickness surface) of the woven fabric cut into a rectangular parallelepiped shape by the above method, and the electrical resistance value of both ends is multiplied by the end cross-sectional area of the test piece. Calculated by dividing by the length of the test piece (unit: Ω · cm). Electrodag 415 (manufactured by Japan Atchison) is used as the conductive paste, and the electrical resistance value can be measured using a digital multimeter (R6581 manufactured by Advantest). In addition, the detail of the textile thickness measuring method required for calculation of the edge part cross-sectional area of the said test piece is mentioned later.

  The thickness of the conductive fabric of the present invention is not particularly limited, but is preferably 0.5 mm or less. When the thickness exceeds 0.5 mm, the inserted metal wire is buried in the carbon fiber and does not appear on the surface when CFRP is used. The conductivity is inferior, and the effects of the present invention may not be fully exhibited. In addition, when the thickness of the fabric is reduced, the number of laminated layers is increased as compared with a thick fabric when the CFRP has a predetermined thickness. This increases the number of metal wire layers, and thus can exhibit excellent conductivity. It is. In addition, the textile thickness of this invention was measured using the thickness measuring device. The thickness measurement was based on “6.5 thickness measurement method” of the general textile test method of JIS L1096 (1999). That is, using a thickness measuring device at five different locations of the fabric, the thickness was measured after waiting for about 10 seconds under a pressure of 23.5 KPa until the thickness did not change, and the average value was shown. Moreover, in the Example mentioned later, No. of Toyo Seiki Seisakusho Co., Ltd. was used as a thickness measuring device. A 132 type digital thickness gauge B-2 was used.

  The woven structure of each of the carbon fiber yarn and the metal wire constituting the conductive fabric of the present invention may be any of a plain weave, a 2/2 twill weave, a 4-sheet insulator, an 8-sheet insulator or a non-crimp fabric. In particular, plain weave is preferred. A plain weave structure is excellent in handling properties (handling properties) such as the prevention of misalignment as a fabric because there are many intersections of the fabric. From another viewpoint, it is easy to develop conductivity, and the effects of the present invention can be exhibited to the maximum.

The carbon fiber yarn comprised in the conductive fabric of the present invention is preferably 12,000 filaments or less, and the basis weight of the carbon fiber yarn in the conductive fabric is preferably 300 g / m ² or less. Conductive fabrics that meet these requirements have many crossing points between carbon fiber yarns, making the fabrics less susceptible to misalignment and excellent handling and surface quality. It is easy to express.

  The metal wire is preferably in the range of 5 to 40% by weight of the carbon fiber in the woven fabric. More preferably, it is the range of 10 to 35% by weight. When the metal wire is woven in the woven fabric in an amount exceeding 40% by weight of the carbon fiber, the conductive woven fabric is heavier, resulting in poor handling and an increase in the weight of the obtained CFRP. In particular, when used for aircraft parts, if the weight of the aircraft increases, it is directly reflected in the fuel cost, which is a serious problem. On the other hand, if it is less than 5% by weight, the metal wire may be too small to obtain the effects of the present invention.

  The method for molding the conductive fabric of the present invention into CFRP is not particularly limited, but a prepreg in which a conductive fabric is impregnated with a matrix resin in advance is prepared, and this is set in a mold and covered with a bag film, and then in an autoclave. Application to autoclave molding in which the resin is cured by heating and pressurizing is most preferable because it exhibits excellent mechanical properties. On the other hand, after laminating the base material containing conductive fabric, set it in the lower mold and cover it with the upper mold or bag film, inject the matrix resin to cure the resin, RTM molding (Resin Transfer Molding) or lamination under reduced pressure Application to VaRTM molding (Vacuum Assisted Resin Transfer Molding), in which a matrix resin is injected into the body, is preferable because it can be molded at low cost.

  Hereinafter, a method for producing a conductive fabric will be described in detail.

In the method for producing a conductive fabric of the present invention, the carbon fiber yarns are arranged in at least two directions including the warp direction and the weft direction, and the weight per unit length is 1 / of the fineness of the carbon fiber yarns. It is a conductive fabric in which a metal wire of 5 or less is inserted, and is woven through the following steps (A) to (C).
Step (A): Warp yarn drawing step for supplying warp-direction carbon fiber yarns and metal wires in a state of being aligned using different guides (B): Carbon fiber yarns and metal in the transverse direction When the rapier grips the wire, arrange the metal wire inside the carbon fiber yarn while gripping the rapier hook. Weft driving process step (C) for driving into the mouth: Weaving process in which the metal wires in the warp direction and the metal wires in the weft direction at an arbitrary 25 cm ² on the plane intersect each other at 70% or more
Warp drawing process (A): 7 in FIG.
In this step, the carbon fiber yarns 1 and the metal wires 2 in the vertical direction are supplied in a state of being aligned using different guides.

  FIG. 5 is a schematic view showing a preferred embodiment of the method for producing a bidirectional fabric of the present invention.

  In the warp drawing process (A) indicated by 7 in FIG. 5, the carbon fiber yarns 1 and the metal wires 2 in the warp direction are respectively passed through separate rolls 13. At this time, if the same roll is passed at a high contact angle of 90 ° or more, a difference in tension occurs due to the difference in the thickness of the yarn, and the metal wire is likely to be loosened and may be bent. That is, when the carbon fiber yarn and the metal wire are passed through different rolls, the respective contact angles may be 90 ° or more. The contact angle of the yarn with respect to the roll refers to the central angle of the roll with respect to the arc in which the yarn is in contact with the roll between the contact point at which the yarn contacts the roll and the contact point away from the roll.

Furthermore, the end closest to the metal wire of the carbon fiber yarn closest to the metal wire is within 0.05 mm in the direction of the center of the carbon fiber yarn with reference to the reference line, and within 0.5 mm in the opposite direction. It is difficult to supply the metal wire in a state where the metal wire is arranged in the range, that is, in a state where the metal wire is arranged substantially along the gap between the carbon fiber yarns. As a result, when the metal wire 2 in the vertical direction is arranged in a meandering, bent, and twisted state, the cover factor is lowered and excellent mechanical properties cannot be exhibited, and the quality stability is inferior. There is.
Weft driving process (B): 8 in FIG.
In this step, the yarn feeding paths of the carbon fiber yarns 3 and the metal wires 4 in the weft direction are aligned using different guides to the position where the driving is started, and when the rapier grips, At the rapier hook, a metal wire is placed inside the carbon fiber yarn and driven into the shed while being gripped.

In the weft driving step (B) shown at 8 in FIG. 5, the yarn feeding path of the carbon fiber yarn 3 and the metal wire 4 in the weft direction is divided by the respective guides 17 to the position where the driving is started. . When the yarn feeding path of the carbon fiber yarn 3 in the weft direction and the metal wire 4 passes through the same place or intersects, as described above, the metal wire 4 in the weft direction is disturbed at the time of insertion. Since the width of the carbon fiber yarns 3 in the weft direction arranged in a narrow direction is reduced, the cover factor of the woven fabric is lowered and excellent mechanical properties cannot be expressed, and the stability of the quality is inferior. In the rapier loom or the gripper loom, which is a continuous loom, the position where the driving is started refers to a position where the rapier or the gripper or the like grips the weft yarn. Further, in a water jet loom or an air jet loom, it indicates a standby position of the weft when water or air flies the weft. In the present invention, it is preferable to use a rapier loom that can easily place the carbon fiber yarn and the metal wire at a desired position.
FIG. 6 is a schematic view for explaining a rapier weft thread gripping method in the case where carbon fibers and metal wires in the weft direction are simultaneously inserted by one rotation of the loom main shaft.
FIG. 7 is a schematic diagram for explaining a weft gripping method in which the hook portion of the rapier shown in FIG. 6 is enlarged.

  When using a rapier loom, in order to drive the carbon fiber yarn 3 and the metal wire 4 in the weft direction at the same time, it is necessary to firmly hold the carbon fiber and the metal wire having different cross-sectional areas with the rapier. Here, in the rapier hook part 20, it is important to arrange and hold the metal wire inside the carbon fiber yarn. By arranging the carbon fiber yarn on the outside of the metal wire thinner than the carbon fiber yarn, the cross section of the carbon fiber yarn is deformed as shown in FIG. 7, and the rapier and the carbon fiber yarn having a deformed cross section are divided into three parts. Tightened with point support, the thin metal wire is firmly held and can be prevented from coming off. Such an embodiment can be said to be a preferred embodiment in the present invention. When trying to grip the metal wire outside the carbon fiber yarn, not only the thin metal wire does not catch well at the rapier head hook position, but also it is easy to come off when inserted, so productivity is increased. It may be significantly inferior. Although a general rapier head is shown in FIGS. 6 and 7, the rapier head shape is not limited to this.

  In order to allow the rapier hook portion 20 to grip the metal wire inside the carbon fiber yarn, the rapier hook portion 20 is arranged so that the feed yarn path of the metal wire 4 in the transverse direction is guided by the guide rather than the yarn feed path of the carbon fiber yarn. It is preferable to arrange at a position close to the opening direction.

According to this method, the carbon fiber yarns in the vertical direction and the metal wires are aligned, while the metal wires are supplied so as to be arranged substantially along the gaps between the carbon fiber yarns, and in the weft direction. It becomes easy to drive the carbon fiber yarn and the metal wire simultaneously so that the carbon fiber yarn and the metal wire are aligned and the metal wire is arranged substantially along the gap between the carbon fiber yarns. With such an embodiment, as described above, meandering, bending, and twisting of the metal wire can be suppressed, and a conductive fabric having both excellent conductivity and surface quality can be easily obtained.
Weaving process (C): 9 in FIG.
In this step, the metal wire 2 in the vertical direction and the metal wire 4 in the horizontal direction at an arbitrary 25 cm ² on the plane are crossed at 70% or more. By passing through the warp drawing process (A) and the weft driving process (B), the above aspect can be formed in this process.
In the conductive fabric, by making the metal wires in the vertical direction and the metal wires in the horizontal direction more intersect, there are many current diffusion paths by the metal wires, and high conductivity can be expressed. . Details of such contents are as described above.

The raw materials used in Examples and Comparative Examples were as follows.

1. Carbon fiber Polyacrylonitrile (PAN) carbon fiber: 6,000 filament, fineness 396 tex, tensile strength 5,300 MPa, tensile elastic modulus 290 GPa
2. Metal wire Triple wire industry phosphor bronze wire, wire diameter 0.1 mm, standard JIS H 32070 W-O
Example 1
(A) Warp drawing process: 7 in FIG.
433 carbon fiber yarns and metal wires in the warp direction are arranged in parallel and alternately, and the conductive fabric is pulled out so that the ground width is 1 m, and the carbon fiber yarn group and the metal wire group are separated. It was made to pass through the roller 13 and the tension difference was eliminated. Thereafter, the yarn was passed through the same guide roller group 18 having a contact angle of 20 ° so that carbon fiber yarns and metal wires were alternately arranged to form a warp yarn sheet. The carbon fiber yarn and the metal wire were threaded through different meshes, and the opening and closing movement was performed so that the adjacent carbon fiber yarn and the metal wire could be handled as one woven yarn.

(B) Weft driving process: 8 in FIG.
The carbon fiber yarns in the weft direction and the metal wires are pulled out by the separate guides 17 to the rapier gripping position without crossing each other, and (A) intersecting with the warp yarn sheet obtained in the warp drawing step in the orthogonal direction. A plain weave structure was constructed (FIG. 1). At this time, the metal wire was arranged closer to the opening direction of the rapier hook than the carbon fiber yarn. At the rapier hook, the metal wire could be gripped inside the carbon fiber yarn.

  The metal wire was suppressed from meandering, bending and twisting in both the vertical direction and the horizontal direction, and could be inserted straight into the fabric. Since the metal wires can be inserted straight, the carbon fibers arranged along the metal wires are also arranged straight without bending.

(C) Weaving process: 9 in FIG.
Bidirectional fabrics were obtained by crossing warps and wefts composed of carbon fiber yarns and metal wires.
In the obtained conductive fabric, carbon fiber yarns and metal fibers are alternately arranged in both the warp direction and the weft direction, and the metal wires in the warp direction and the weft direction are arranged in the gaps between the carbon fiber yarns. It was. Moreover, when the crossing point of the metal wire in arbitrary 25cm < ² > on the plane of a textile fabric was investigated, it was crossing at 76% or more. The cover factor was 94%, the fabric thickness was 0.32 mm, and the volume resistivity of the fabric at 45 ° was 0.003 Ω · cm.
(Example 2)
A bi-directional woven fabric was obtained in the same manner as in Example 1 except that (A) the warp drawing step and (B) the weft driving step were woven with a four-piece insulator. The metal wire was suppressed from meandering, bending and twisting in both the vertical and transverse directions, and could be inserted straight into the fabric. Since the metal wires can be inserted straight, the arranged carbon fibers are also arranged straight without bending. Further, the metal wires in the warp direction and the weft direction were arranged in the gaps between the carbon fiber yarns.
The obtained conductive fabric was examined for crossing points of metal lines at an arbitrary 25 cm ² on the plane of the fabric and found to cross at 72% or more. The cover factor was 98% and the fabric thickness was 0.31 mm. The volume resistivity of the woven fabric at 45 ° was 0.004 Ω · cm. In addition, the drapeability (flexibility) was superior to the fabric of Example 1.
(Comparative Example 1)
(B) The conductive fabric in the same manner as in Example 1 except that, in the weft driving process, the carbon fiber yarns in the weft direction and the yarn feeding path of the metal wire in the weft direction are not separated by separate guides. Got.
In the obtained conductive fabric, carbon fiber yarns in the weft direction and metal wires crossed on the yarn feeding path, and many meandering and twisting of the metal wires in the weft direction were observed. Due to the meandering and twisting of the metal wires, the width of the arranged carbon fibers was reduced, and a number of bent portions were observed.
The cover factor of the obtained conductive fabric was 88%. In addition, there were scattered places where the conductive fabric and metal wires in the transverse direction were not alternately arranged, and the crossing rate of the metal wires at an arbitrary 25 cm ² on the plane of the fabric was 59%. The volume resistivity at 45 ° of the woven fabric was 0.13 Ω · cm.
In addition to the above, as a problem, the obtained conductive fabric cannot grip the metal wire inside the carbon fiber yarn at the rapier head hook position, and cannot insert only the metal wire in the transverse direction. Since this occurs frequently, it has often been impossible to obtain a conductive fabric with a metal wire inserted.
(Comparative Example 2)
(B) In the weft driving step, the arrangement in which the carbon fiber yarn in the weft direction of Example 1 and the yarn feeding path of the metal wire in the weft direction are separated by a guide is reversed, and at the rapier head hooking position, A conductive fabric was obtained in the same manner as in Example 1 except that the metal wire was held outside the carbon fiber yarn.
However, the metal wire cannot be gripped inside the carbon fiber yarn at the rapier head hook position, and only the metal wire in the horizontal direction cannot be inserted frequently. It was not obtained.

  According to the conductive fabric of the present invention, it is possible to obtain a conductive fabric excellent in straightness by suppressing the disturbance and bending of the metal wire. Also, it is possible to provide a conductive woven fabric that can have many intersection points between a vertical metal wire and a horizontal metal wire, and can obtain a composite material excellent in conductivity, mechanical properties, and surface quality with high productivity. Can do. Such a conductive fabric can be suitably used for a structural member of a transportation device such as an aircraft, a ship, and an automobile, or a building member.

It is the schematic which shows one embodiment of the conductive fabric obtained with the manufacturing method in this invention. It is the schematic which shows another one embodiment of the electroconductive textile fabric obtained with the manufacturing method in this invention. It is the schematic which shows another one embodiment of the electroconductive textile fabric obtained with the manufacturing method in this invention. It is the schematic which shows another one embodiment of the electroconductive textile fabric obtained with the manufacturing method in this invention. It is the schematic which shows one preferable embodiment of the manufacturing method in this invention. It is the schematic explaining the weft grip method of the rapier at the time of weft insertion in this invention. It is an enlarged view of the rapier hook in FIG. It is the schematic explaining the position which cuts out the test piece for measuring the electroconductivity of a conductive fabric. It is the schematic explaining the test piece for measuring the electroconductivity of a conductive fabric.

Explanation of symbols

1: Carbon fiber yarn in the vertical direction 2: Metal wire in the vertical direction 3: Carbon fiber yarn in the horizontal direction 4: Metal wire in the horizontal direction 5, 10, 11, 12: Conductive fabric 6: Loom 7: Process (A)
8: Process (B)
9: Process (C)
13: Roller 14: Spear
15: 綜 絖 16: rapier 17: guide 18: guide roller 19: rapier movable part 20: rapier hook part 21: rapier head 22: test piece cutting line for conductivity measurement 23: conductive paste 24: test piece for conductivity measurement

Claims (13)

A conductive fabric in which carbon fiber yarns are arranged in at least two directions including a warp direction and a weft direction, and metal wires are arranged in parallel with the carbon fiber yarns in at least the warp direction and the weft direction. The vertical metal wire and the horizontal metal wire at an arbitrary 25 cm ² on the plane cross each other at 70% or more, and the cover factor of the conductive fabric is 90 to 100%. Characteristic conductive fabric.   The conductive fabric according to claim 1, wherein carbon fiber yarns and metal wires are alternately arranged in two directions, a warp direction and a weft direction of the fabric.   3. The conductive fabric according to claim 1, wherein the metal wires are arranged along a gap between the carbon fiber yarns in two directions of a warp direction and a weft direction.   The weight per unit length of the metal wire is 1/5 or less of the fineness of the carbon fiber yarn, and the conductivity at 293K (% IACS) is in the range of 40 to 100% with respect to standard copper, The conductive fabric according to any one of claims 1 to 3, wherein the standard electrode potential of the main metal element used for the metal wire is in the range of -1 to + 1V.   The conductive fabric according to any one of claims 1 to 4, wherein the metal wire is a single wire of phosphor bronze.   The conductive fabric according to any one of claims 1 to 5, wherein the conductive fabric has a volume resistivity of 0.07 Ω · cm or less in a direction where the angle to the carbon fiber yarn in the weft direction is 45 °. .   The conductive fabric according to any one of claims 1 to 6, wherein the carbon fiber yarn constituting the conductive fabric and the metal wire adjacent thereto are crossed with the same woven structure.   The conductive fabric according to any one of claims 1 to 6, wherein the carbon fiber yarn constituting the conductive fabric and the metal wire adjacent to the carbon fiber yarn are crossed with different woven structures.   When the weave structure of the conductive fabric intersects the carbon fiber yarn group in the warp direction and the carbon fiber yarn group in the transverse direction without bending each other, the metal wire intersects with both the yarn groups. The conductive fabric according to any one of claims 1 to 6, wherein the conductive fabric is a non-crimp fabric which is woven and held together. The fineness of the carbon fiber yarn forming the conductive fabric is 150 to 1700 tex, the basis weight of the carbon fiber in the conductive fabric is 50 to 300 g / m ² , and the metal wire is carbon fiber in the fabric. The conductive fabric according to any one of claims 1 to 9, wherein the conductive fabric is contained in a range of 5 to 40% by weight. Conductivity in which carbon fiber yarns are arranged in at least two directions including the warp direction and the weft direction, and a metal wire having a weight per unit length of 1/5 or less of the fineness of the carbon fiber yarns is inserted. A method for producing a conductive woven fabric, which is woven through the following steps (A) to (C).
Step (A): Warp yarn drawing step for supplying warp-direction carbon fiber yarns and metal wires in a state of being aligned using different guides (B): Carbon fiber yarns and metal in the transverse direction When the rapier grips the wire, arrange the metal wire inside the carbon fiber yarn while gripping the rapier hook. Weft driving process step (C) for driving into the mouth: Weaving process in which the metal wires in the warp direction and the metal wires in the weft direction at an arbitrary 25 cm ² on the plane intersect each other at 70% or more   The process for producing a conductive fabric according to claim 11, wherein in the step (B), the carbon fiber yarns in the weft direction and the metal wires along the weft are simultaneously driven into a shed by a rapier and woven. The method for producing a conductive woven fabric according to claim 11, wherein in the step (B), the carbon fiber yarns in the weft direction and the metal wires along the weft are alternately driven into a shed by a rapier and woven. .

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