WO2023162424A1 - Tissu conducteur - Google Patents

Tissu conducteur Download PDF

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Publication number
WO2023162424A1
WO2023162424A1 PCT/JP2022/046574 JP2022046574W WO2023162424A1 WO 2023162424 A1 WO2023162424 A1 WO 2023162424A1 JP 2022046574 W JP2022046574 W JP 2022046574W WO 2023162424 A1 WO2023162424 A1 WO 2023162424A1
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WO
WIPO (PCT)
Prior art keywords
conductive
yarn
fabric
diameter
yarns
Prior art date
Application number
PCT/JP2022/046574
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English (en)
Japanese (ja)
Inventor
健司 向當
幸輔 宮崎
俊樹 前川
Original Assignee
セーレン株式会社
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Publication date
Application filed by セーレン株式会社 filed Critical セーレン株式会社
Priority to JP2023503142A priority Critical patent/JP7303404B1/ja
Publication of WO2023162424A1 publication Critical patent/WO2023162424A1/fr

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    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
    • D02G3/12—Threads containing metallic filaments or strips
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/38—Threads in which fibres, filaments, or yarns are wound with other yarns or filaments, e.g. wrap yarns, i.e. strands of filaments or staple fibres are wrapped by a helically wound binder yarn
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
    • D03D15/242—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads inorganic, e.g. basalt
    • D03D15/25—Metal
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/40—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads
    • D03D15/47—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads multicomponent, e.g. blended yarns or threads
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/50—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads
    • D03D15/533—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads antistatic; electrically conductive
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B1/14—Other fabrics or articles characterised primarily by the use of particular thread materials
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes

Definitions

  • the present invention relates to a conductive fabric made of a woven or knitted fabric containing conductive yarns and non-conductive yarns.
  • Conductive fabrics are widely used, for example, as electrode fabrics for sensors in vehicle interiors, clothing, health/nursing/medical equipment, furniture, etc. 2. Description of the Related Art
  • a conductive fabric is incorporated in a steering wheel and used as an electric circuit of a sensor (touch sensor) for detecting pressure applied to the steering wheel by a driver.
  • This sensor detects the state of the driver gripping the steering wheel (for example, whether or not the driver is gripping the steering wheel with both hands, what position the driver is gripping, etc.). It is necessary to accurately detect the pressure applied to the steering wheel from the Therefore, the conductive fabric is required to have stable conductivity.
  • a conductive fabric for example, a fabric in which a conductive pattern (conductive layer) made of a conductive material is laminated via an adhesive on the surface of a fabric made of non-conductive fibers has been proposed (for example, see Patent Document 2).
  • a fabric in which both sides of a mesh-like base material, which is a non-conductive fabric, is coated with a conductive composition has been proposed (see, for example, Patent Document 3).
  • Patent Documents 1 and 2 which are obtained by laminating a conductive layer on a fabric made of non-conductive yarn, peeling of the fabric and the conductive layer, breakage (cracking) of the conductive layer, etc. occur during expansion and contraction. There is a risk. When such peeling or breakage occurs, the resistance value fluctuates greatly before and after expansion and contraction, and the conductivity becomes unstable, leading to a decrease in electrical reliability. In addition, if peeling or breaking occurs in a part of the conductive layer, the peeling or breakage spreads in the plane direction, and there is a possibility that the resistance value will fluctuate further. Furthermore, the conductive fabrics of Patent Documents 1 and 2 have conductivity in the surface direction because the conductive layer is laminated on the non-conductive fabric, but do not have conductivity in the thickness direction. However, it is difficult to say that the conductivity is excellent.
  • Patent Document 3 has conductivity in the plane direction and the thickness direction, as in Patent Documents 1 and 2, the conductive layer is laminated on the non-conductive fabric, so the fabric and the conductivity Separation from the layer, breakage of the conductive layer, and the like may occur.
  • the conductive fabric is required to have stretchability. If the stretchability of the conductive cloth is insufficient, the adhesion to the object to be measured will be insufficient. In addition, there is a risk that the conductive yarn will break with the expansion and contraction, and the resistance variation rate will increase with the expansion and contraction, that is, the conductive stability will decrease.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a conductive fabric that is excellent in stretchability and conductive stability.
  • the characteristic configuration of the conductive fabric according to the present invention for solving the above problems is A conductive fabric made of a woven or knitted fabric containing conductive yarn and non-conductive yarn,
  • the conductive yarn is a covering yarn in which a conductive sheath yarn containing a metal wire is wound around an elastic core yarn
  • the non-conductive yarn is a stretchable multifilament yarn
  • the ratio (D1/D2) of the diameter (D1) of the conductive yarn and the diameter (D2) of the non-conductive yarn is 1.0 to 2.6
  • the ratio (a:b) of the number (a) of the conductive yarn and the number (b) of the non-conductive yarn is 1:2 to 1 in at least one of the warp direction and the weft direction of the conductive fabric. :40.
  • the conductive fabric is made of a woven or knitted fabric containing conductive yarn and non-conductive yarn, so that the conductive fabric has conductivity both in the surface direction and in the thickness direction. .
  • the covering yarn as the conductive yarn, together with the stretchable non-conductive yarn, stretchability is imparted to the conductive fabric.
  • Conductivity is imparted to the conductive cloth by using the conductive yarn in the conductive cloth.
  • the ratio (D1/D2) of the diameter (D1) of the conductive yarn and the diameter (D2) of the non-conductive yarn is 1.0 or more, the conductive yarn is difficult to be buried in the non-conductive yarn, and Since it becomes difficult to break, the conductive fabric has improved conductivity stability.
  • the conductive yarn becomes relatively soft, so that the stretchability of the conductive cloth is enhanced.
  • the ratio (a:b) of the number (a) of the conductive yarn and the number (b) of the non-conductive yarn is 1:2 to 1:40 in at least one of the warp direction and the weft direction of the conductive fabric.
  • the number of conductive yarns per unit area becomes a certain number or more, so that the conductivity of the conductive cloth is improved, and the conductive stability is also improved accordingly.
  • the number (b) of non-conductive yarns with relatively low rigidity is increased compared to the number (a) of conductive yarns with relatively high rigidity, the conductive fabric has high stretchability. It will be the one that was given.
  • the constant load elongation rate (hereinafter also referred to as "5N constant load elongation rate") when a load of 5N measured in accordance with the elongation rate (B method) of JIS L1096 is applied is 20%.
  • the knitted fabric it preferably has a constant load elongation of 20% or more when a load of 5 N is applied, which is measured according to the elongation of JIS L1096 (Method D).
  • the 5N constant load elongation rate is 20% or more, so that the conductive fabric has improved stretchability.
  • the elongation at break of the core yarn is 70% or more.
  • the breaking elongation of the core yarn is 70% or more, the stretchability of the conductive yarn is enhanced, and as a result, the stretchability of the conductive fabric is further enhanced. become a thing.
  • the conductive yarn is preferably formed by winding the conductive sheath yarn 1000 to 3000 times around 1 m of the core yarn.
  • the conductive sheath yarn does not float when covering the core yarn. , the quality is improved, and the stretchability of the conductive fabric is further enhanced.
  • the resistance value variation rate at 40% elongation is 30% or less.
  • the resistance value fluctuation rate at 40% elongation is 30% or less, so that the resistance value fluctuation is small before and after elongation (that is, the resistance value fluctuation due to stretching is smaller), the conductive stability is enhanced.
  • the sensitivity of the said sensor can be improved by using the said electroconductive cloth for a sensor, for example.
  • the thickness is 0.6 mm or less.
  • the conductive fabric of this configuration since the thickness is 0.6 mm or less, it is possible to suppress the generation of a step when the conductive fabric is incorporated in another member.
  • the conductive fabric when the conductive fabric is incorporated in a sensor such as a steering wheel sensor, the conductive fabric can suppress the generation of steps in the sensor, so the conductive fabric does not adversely affect the tactile sensation of the sensor. .
  • the distance between the conductive threads is 5 mm or less.
  • the conductive fabric of this configuration since the distance between the conductive yarns is 5 mm or less, the number of conductive yarns per unit area increases, so the conductivity of the conductive fabric is increased. The conductive stability is also enhanced.
  • FIG. 1 is a plan view of a steering wheel in which a conductive fabric according to the present invention is built, and is shown together with a partially enlarged view of the built-in conductive fabric.
  • FIG. 2 is a partially enlarged view of the conductive fabric according to the present invention, showing (a) a state in which no load is applied and (b) a state in which a load is applied.
  • FIG. 3 is an explanatory diagram of conductive yarn and non-conductive yarn, showing (a) an overall configuration diagram of conductive yarn, (b) cross-sectional view of core yarn and sheath yarn, and (c) cross-sectional view of non-conductive yarn.
  • the conductive fabric of the present invention will be explained with reference to the drawings.
  • the configuration (structure) shown in each figure is appropriately exaggerated or simplified for ease of explanation, and the size relationship and scale relationship of the threads included in the structure accurately reflect the actual conductive fabric. It's not limited to things.
  • FIG. 1 is a plan view schematically showing a steering wheel 500 of a vehicle in which the conductive fabric 1 according to the present invention is built.
  • the conductive cloth 1 is incorporated in the steering wheel 500 and constitutes the electric circuit of the steering wheel sensor.
  • the conductive fabric 1 includes conductive yarns 200 and non-conductive yarns 300 .
  • the conductive fabric 1 is composed of a fabric 10 including conductive yarns 200 and non-conductive yarns 300 . Due to the stretchability of the conductive yarn 200 and the non-conductive yarn 300, the conductive cloth 1 can be deformed to follow the shape of the synthetic leather or the like of the outer surface of the steering wheel 500 well.
  • the steering wheel 500 for example, electrodes are provided in each of two installation areas (not shown) spaced apart in the latitudinal direction.
  • the steering wheel sensor is configured to detect the pressure with which the driver grips the steering wheel 500 while the conductive cloth 1 is energized through the electrodes.
  • Conventionally known electrodes can be used as the electrodes.
  • the conductive fabric 1 can be arranged so that its weft direction is along the rotation direction of the steering wheel 500 and its warp direction is along the circumferential direction (grip direction) of the steering wheel 500.
  • the arrangement is not particularly limited.
  • FIG. 2 is a partially enlarged view of the conductive cloth 1 according to the present invention.
  • FIG. 2( a ) shows a state in which no load is applied to the conductive cloth 1 .
  • conductive yarns 200 and non-conductive yarns 300 are used in the warp direction and the weft direction of the cloth 10 (that is, the conductive cloth 1).
  • the conductive fabric 1 corresponds to a fabric in which non-conductive yarns 300 are used in a grid pattern in the warp and weft directions, and some of the non-conductive yarns 300 are replaced with conductive yarns 200 . Since the conductive yarn 200 and the non-conductive yarn 300 constitute the fabric in this way, the fabric 10 has conductivity both in the surface direction and the thickness direction.
  • the conductive thread 200 is a covering thread in which a conductive sheath thread 220 including a metal wire is wound around a stretchable core thread 210, and the non-conductive thread 300 is a stretchable multifilament thread.
  • a conductive sheath thread 220 including a metal wire is wound around a stretchable core thread 210
  • the non-conductive thread 300 is a stretchable multifilament thread.
  • a fabric is a fabric-like structure composed of fibers. Fabrics include woven fabrics, knitted fabrics, and the like.
  • the fabric 10 constituting the conductive fabric 1 illustrated in FIGS. 1 and 2 is obtained by combining conductive yarns 200 and non-conductive yarns 300 in a grid pattern.
  • the fabric 10 is a woven fabric, the fabric 10 is woven from conductive yarns 200 and non-conductive yarns 300 .
  • the conductive yarns 200 can be arranged at intervals in the warp and/or weft directions.
  • the weave structure of the woven fabric is not particularly limited, and can be appropriately set. For example, plain weave, twill weave, and satin weave can be employed.
  • the fabric 10 is knitted using the conductive yarn 200 and the non-conductive yarn 300 .
  • the conductive yarns 200 can be arranged at intervals in the warp or weft direction.
  • the knitting structure of the knitted fabric is not particularly limited, and can be appropriately set.
  • a weft knitted fabric knitted with a weft knitting structure such as cotton sheeting, rubber knitting, and pearl knitting is preferable.
  • the non-conductive yarn 300 is a stretchable multifilament yarn.
  • the non-conductive yarns 300 are used in a grid pattern in the warp and weft directions.
  • the multifilament yarn may optionally be twisted or subjected to processing such as false twisting or fluid disturbance treatment.
  • non-conductive yarn is synonymous with insulating yarn.
  • the fineness (total fineness) of the non-conductive yarn 300 is preferably 22 to 167 dtex, and the upper limit is more preferably 84 dtex or less. Since the total fineness of the non-conductive yarn 300 is 167 dtex or less, the conductive cloth 1 becomes flexible and the thickness of the conductive cloth 1 is relatively small, so that the conductive cloth 1 can be used as a sensor or the like. It is possible to suppress the occurrence of a step when built-in. On the other hand, since the total fineness of the non-conductive yarn 300 is 22 dtex or more, the strength of the conductive cloth 1 is enhanced.
  • the diameter (D2) of the non-conductive yarn 300 is preferably 45 to 125 ⁇ m, and more preferably 88 ⁇ m or less for the upper limit. Since the diameter (D2) of the non-conductive yarn 300 is 125 ⁇ m or less, the conductive cloth 1 becomes flexible, and the thickness of the conductive cloth 1 is relatively small, so that the conductive cloth 1 can be used as a sensor. It is possible to suppress the occurrence of a step when it is built in, for example. On the other hand, since the diameter (D2) of the non-conductive yarn 300 is 45 ⁇ m or more, the strength of the conductive cloth 1 is enhanced. Incidentally, the diameter (D2) of the non-conductive thread 300 will be described later.
  • the material of the fibers that make up the non-conductive yarn 300 is not particularly limited, and examples include natural fibers, regenerated fibers, semi-synthetic fibers, and synthetic fibers. These can be used individually by 1 type or in combination of 2 or more types. Among them, synthetic fibers are preferred because of their excellent strength, and polyester fibers such as polyethylene terephthalate and polytrimethylene terephthalate are preferred. Since the non-conductive yarn 300 is composed of synthetic fibers, it becomes possible to melt the non-conductive yarn 300 by laser removal processing or the like when connecting the conductive cloth 1 to the electrodes described above.
  • the shape of the fibers is not particularly limited, and may be either long fibers or short fibers.
  • cross-sectional shape of the fiber is not particularly limited, and may be not only a general round shape, but also atypical shapes such as flat, elliptical, triangular, hollow, Y-shaped, T-shaped, and U-shaped. may
  • the non-conductive yarn 300 is made by side-by-side composite spinning of two types of synthetic fibers (for example, two types of polyester fibers (for example, polyethylene terephthalate fiber and polytrimethylene terephthalate fiber)). It is preferably a crimped yarn to which crimping property is imparted (crimped), and preferably a crimped yarn obtained by subjecting a crimped yarn to false twisting. More preferably, the crimped yarn is subjected to DDW processing after false twisting, from the viewpoint of having further stretchability.
  • two types of synthetic fibers for example, two types of polyester fibers (for example, polyethylene terephthalate fiber and polytrimethylene terephthalate fiber)
  • crimped yarn to which crimping property is imparted crimped
  • crimped yarn obtained by subjecting a crimped yarn to false twisting More preferably, the crimped yarn is subjected to DDW processing after false twisting, from the viewpoint of having further stretchability.
  • the stretchable non-conductive yarn 300 preferably has a breaking elongation of 70% or more.
  • the breaking elongation of the non-conductive yarn 300 is 70% or more, the stretchability of the non-conductive yarn 300 is enhanced, so that the stretchability of the conductive fabric 1 is enhanced.
  • the upper limit of the breaking elongation of the non-conductive yarn 300 is not particularly limited, and can be set as appropriate, for example, 150%. A method for measuring the "elongation at break" will be described later.
  • FIG. 3 is an explanatory diagram of the conductive thread 200 and the non-conductive thread 300.
  • FIG. FIG. 3(a) is an overall configuration diagram of the conductive thread 200.
  • the conductive thread 200 is an electrically conductive thread, and is configured, for example, as a covering thread having a core thread 210 and a conductive sheath thread 220 wound around the core thread 210 .
  • the conductive yarn 200 preferably has an electrical resistivity of 5 ⁇ 10 ⁇ 5 ⁇ m or less from the viewpoint of sufficiently imparting conductivity to the conductive cloth 1 . Therefore, it is preferable that the conductive sheath thread 220 used for the conductive thread 200 does not have an insulating film and consists only of metal wires.
  • the conductive thread 200 is configured as a covering thread having a core thread 210 and a conductive sheath thread 220, so that the stretchability of the conductive thread 200 is realized.
  • the conductive yarn 200 is preferably a single covering yarn in which one conductive sheath yarn 220 is wound around a core yarn 210, as shown in FIG. 3(a). By using the conductive yarn 200 of such a single covering yarn, the conductive fabric 1 becomes excellent in stretchability.
  • the core yarn 210 used for the conductive yarn 200 is preferably monofilament yarn or multifilament yarn.
  • the fineness of the core yarn 210 is preferably 22 to 167 dtex, and the upper limit is more preferably 84 dtex or less.
  • the conductive yarn 200 becomes flexible, and the flexibility of the conductive fabric 1 is further increased, so that the conductive fabric 1 having excellent stretchability can be realized. can.
  • the fineness of the core yarn 210 is 22 dtex or more, the strength of the conductive cloth 1 can be increased.
  • the diameter of the core yarn 210 is preferably 45 to 125 ⁇ m, and the upper limit is more preferably 88 ⁇ m or less.
  • the conductive yarn 200 becomes flexible, so that the conductive fabric 1 having excellent stretchability can be realized.
  • the strength of the conductive cloth 1 can be increased by setting the diameter of the core yarn 210 to 45 ⁇ m or more.
  • the diameter of the core thread 210 means the maximum diameter.
  • the material of the core thread 210 is not particularly limited, and examples thereof include natural fibers, regenerated fibers, semi-synthetic fibers, synthetic fibers, etc. Synthetic fibers are preferable from the viewpoint of strength. Synthetic fibers include, for example, polyester fibers, and polyethylene terephthalate and polytrimethylene terephthalate are particularly preferred.
  • the core yarn 210 is a side-by-side composite of two types of synthetic fibers (for example, two types of polyester fibers (for example, polyethylene terephthalate fiber and polytrimethylene terephthalate fiber)). It is preferably a crimped yarn imparted with crimpability (crimped) by spinning. Further, it is more preferable to use a crimped yarn obtained by subjecting a crimped yarn to false twisting. is preferable from the viewpoint of increasing In addition, since the core yarn 210 is such a crimped yarn, the degree of expansion and contraction between the core yarn 210 and the conductive sheath yarn 220 can be made close, so that the conductive fabric 1 is stretched and bent. It is possible to suppress the conductive sheath yarn 220 from jumping out of the conductive cloth 1 at the time.
  • two types of synthetic fibers for example, two types of polyester fibers (for example, polyethylene terephthalate fiber and polytrimethylene terephthalate fiber)
  • crimped yarn imparted with
  • the stretchable core yarn 210 preferably has a breaking elongation of 70% or more. Since the elongation at break of the core yarn 210 is 70% or more, the stretchability of the conductive yarn 200 is further enhanced, and as a result, the stretchability of the conductive fabric 1 is further enhanced. On the other hand, the upper limit of the elongation at break of the core yarn 210 is not particularly limited, and can be set as appropriate, for example, 150%.
  • the conductive sheath yarn 220 is preferably made of only metal wires, as described above.
  • the diameter of the metal wire of the conductive sheath yarn 220 is preferably 20-80 ⁇ m, more preferably 25-70 ⁇ m. Since the diameter of the metal wire of the conductive sheath yarn 220 is 20 ⁇ m or more, the conductive sheath yarn 220 is less likely to break when stretched, so that the conductive fabric 1 is suppressed in resistance value fluctuations due to stretching. Become.
  • the diameter of the metal wire of the conductive sheath yarn 220 is 80 ⁇ m or less, the rigidity of the conductive yarn 200 does not become too high, so that the stretchability of the conductive cloth 1 is enhanced.
  • the diameter of the metal wire of the conductive sheath thread 220 means the maximum diameter.
  • Materials of the metal wire forming the conductive sheath yarn 220 include, for example, aluminum, nickel, copper, titanium, magnesium, tin, zinc, iron, silver, gold, platinum, vanadium, molybdenum, tungsten, chromium, manganese, silicon, Elemental metals such as lead, bismuth, boron, germanium, arsenic, antimony, tellurium, and cobalt and alloys thereof can be used, and among these, alloys of copper and tin are preferably used. Moreover, the elongation at break of the metal wire is preferably 15% or more.
  • the breaking elongation of the metal wire is 15% or more, the stretchability of the conductive yarn 200 is improved, so that the stretchability of the conductive cloth 1 is improved.
  • the upper limit of the breaking elongation of the metal wire is not particularly limited, and can be set as appropriate, for example, 100%.
  • the metal wire of the conductive sheath thread 220 preferably has an electrical resistivity of 5 ⁇ 10 ⁇ 5 ⁇ m or less, more preferably 1.5 ⁇ 10 ⁇ 6 ⁇ m or less, and 5.0 ⁇ 10 ⁇ 7 ⁇ m or less is more preferable. Since the electrical resistivity of the metal wire of the conductive sheath yarn 220 is 5 ⁇ 10 ⁇ 5 ⁇ m or less, the conductive cloth 1 has improved conductivity, and accordingly, conductive stability is improved. is also heightened. Moreover, when using the conductive cloth 1 for a sensor, the sensitivity of a sensor can be improved.
  • the conductive sheath yarn 220 preferably has 1000 to 3000 turns per meter around the core yarn 210 (hereinafter simply referred to as "the number of turns").
  • the number of turns of the conductive sheath yarn 220 is 1000 or more, the conductive sheath yarn 220 does not float when the core yarn 210 is covered, so that the quality is improved.
  • the number of turns of the conductive sheath yarn 220 is 3000 or less, the stretchability of the conductive cloth 1 is further enhanced.
  • the conductive threads 200 are preferably arranged at regular intervals. Specifically, it is preferable that they are arranged at equal intervals in at least one of the warp direction and the weft direction of the fabric 10 .
  • the conductive yarns 200 By arranging the conductive yarns 200 at equal intervals, even if a part of the conductive yarns 200 is broken, the conductivity of the conductive cloth 1 as a whole can be maintained relatively evenly.
  • the fabric 1 has enhanced conductivity stability.
  • the spacing between the conductive yarns 200 is preferably 0.09 to 5 mm, more preferably 1.9 to 5 mm.
  • the number of conductive yarns 200 per unit area is increased. The conductivity is enhanced, and the conductivity stability is also enhanced accordingly.
  • the distance between the conductive yarns 200 is 0.09 mm or more, the stretchability of the conductive cloth 1 can be sufficiently enhanced.
  • the distance between the conductive yarns 200 in the direction in which the number of conductive yarns 200 per unit area is large among the warp and weft directions of the fabric 10 is , 0.09 to 5 mm, more preferably 1.9 to 5 mm.
  • the spacing of the conductive yarns 200 in either direction may be adopted, and the conductive yarns 200 are present in one of the two directions.
  • the spacing of the conductive yarns 200 in the other direction shall be adopted.
  • the distance between the conductive yarns 200 in the direction in which the number of the conductive yarns 200 is large is 5 mm or less
  • the number of the conductive yarns 200 per unit area increases in the direction, so the conductivity of the conductive fabric 1 is more.
  • the electrical conductivity is increased, and the electrical conductivity stability is also increased accordingly.
  • the distance between the conductive yarns 200 in the direction in which the number of the conductive yarns 200 is large is 0.09 mm or more, the stretchability of the conductive fabric 1 can be sufficiently enhanced.
  • FIG. 3(b) is a cross-sectional view of the core yarn 210 and the conductive sheath yarn 220 used for the conductive yarn 200.
  • the degree of adhesion between the core yarn 210 and the conductive sheath yarn 220 differs depending on the manner in which the conductive sheath yarn 220 is layered on the core yarn 210.
  • the conductive yarn 200 composed of the core yarn 210 and the conductive sheath yarn 220 is different.
  • the diameter can vary. Therefore, in the present invention, as shown in FIG.
  • the diameter (Da) of the core thread 210 and the diameter (Db) of the conductive sheath thread 220 are the maximum diameters of each.
  • the diameter (Db) of the conductive sheath thread 220 corresponds to the diameter of the metal wire.
  • FIG. 3(c) is a cross-sectional view of the non-conductive yarn 300.
  • the diameter (D2) of the non-conductive thread 300 is its maximum diameter, as shown in FIG. 3(c).
  • the thickness of the conductive fabric 1 (that is, the thickness of the fabric 10) is determined by the ratio (D1/D2) of the diameter (D1) of the conductive yarn 200 and the diameter (D2) of the non-conductive yarn 300.
  • this ratio (D1/D2) becomes small, that is, when the diameter (D1) of the conductive yarn 200 is relatively smaller than the diameter (D2) of the non-conductive yarn 300, the stretchability of the conductive fabric 1 is improved.
  • the conductive yarn 200 may be buried in the non-conductive yarn 300, and the conductivity of the conductive cloth 1 may be lowered.
  • the strength of the conductive thread 200 is lowered, and as a result, the conductive thread 200 may be broken during expansion and contraction.
  • the ratio (D1/D2) increases, that is, when the diameter (D1) of the conductive yarn 200 is relatively larger than the diameter (D2) of the non-conductive yarn 300, the conductivity of the conductive fabric 1 increases. While it is improved, the rigidity of the conductive yarn 200 is relatively increased, and there is a possibility that the stretchability of the conductive cloth 1 is reduced.
  • the ratio (D1/D2) of the diameter (D1) of the conductive yarn 200 and the diameter (D2) of the non-conductive yarn 300 is 1.0 to 2.6, more preferably 1.1 to 2.6, 1.2 to 2.4 are more preferred.
  • the ratio (D1/D2) is 1.0 or more, the conductive yarn 200 is difficult to be embedded in the non-conductive yarn 300 and is difficult to break, so the conductive fabric 1 has high conductive stability. It will be the one that was given.
  • the ratio (D1/D2) is 2.6 or less, the conductive yarn 200 becomes relatively soft, so that the conductive fabric 1 has enhanced stretchability.
  • the ratio (a:b) of the number (a) of the conductive yarns 200 and the number (b) of the non-conductive yarns 300 (hereinafter also referred to as "mixing ratio") is the fabric 10 (that is, the conductive fabric 1) 1:2 to 1:40, preferably 1:5 to 1:40, more preferably 1:10 to 1:40 in at least one of the warp and weft directions.
  • the ratio (a:b) is 1:2 to 1:40 in at least one of the warp direction and weft direction of the fabric 10.
  • the number of conductive yarns 200 per unit area becomes a certain or more, The conductivity of the conductive cloth 1 is enhanced, and the conductive stability is also enhanced accordingly.
  • the number (b) of the non-conductive yarns 300 with relatively low rigidity is increased compared to the number (a) of the conductive yarns 200 with relatively high rigidity, the conductive fabric 1 is elastic is heightened.
  • the ratio (a:b) is the unit length in at least one of the warp and weft directions in the region where the conductive yarn 200 exists in the conductive fabric 1 (region that can function as a conductive portion such as a sensor) It is the ratio between the number (a) of the conductive threads 200 and the number (b) of the non-conductive threads 300. Specifically, the above ratio (a:b) is obtained for arbitrary ten square (square) regions of 30 mm warp ⁇ 30 mm weft selected to include the conductive yarn 200 in the conductive fabric 1.
  • the number (a) of the conductive yarns 200 and the number (b) of the non-conductive yarns 300 in at least one of the warp direction and the weft direction are counted, and the average value of the number (a) of the conductive yarns 200 in each direction and the non-conductive
  • the average value of the number (b) of the yarns 300 is calculated, and the calculated average value of the number (a) of the conductive yarns 200 and the average value of the calculated number (b) of the non-conductive yarns 300 are obtained.
  • a ratio of average values per unit length (30 mm) is obtained in each of the warp and weft directions.
  • the ratio (a:b) is the average of the number (a) of the conductive yarns 200 and the number (b) of the non-conductive yarns 300 per unit length (30 mm) in at least one of the warp and weft directions. is a ratio of values.
  • the conductive yarn 200 is not unevenly distributed but distributed.
  • FIG. 2(b) shows a state in which a load is applied to the conductive cloth 1.
  • FIG. 2(b) when a load F is applied to at least one of the warp direction and the weft direction of the fabric 10 (the weft direction in the illustration of FIG. 2(b)), the conductive fabric 1 is From the unloaded state shown in (a), it extends in the direction of load as shown in FIG. 2(b). As a result, the length of the conductive cloth 1 is extended from the length of the unloaded state (for example, the length corresponding to the chuck interval described later) K1 (see FIG. 2(a)), and the length K2 (see FIG. 2(b)).
  • the conductive fabric 1 When the load is released, the conductive fabric 1 shrinks in the direction of the load and returns to the unloaded state.
  • the length of the conductive cloth 1 shrinks from the length K2 (see FIG. 2(b)) and returns to the length K1 (see FIG. 2(a)).
  • the conductive fabric 1 preferably has a 5N constant load elongation rate (that is, an elongation rate when a load of 5N is applied as the load F) of 20% or more, more preferably 30% or more.
  • the upper limit of the 5N constant load elongation rate is not particularly limited, and can be set as appropriate, for example, 100%.
  • the 5N constant load elongation rate is obtained by using the length K1 of the conductive fabric 1 with no load applied and the length K2 of the conductive fabric 1 with a 5N load applied. It is represented by Formula (1).
  • 5N constant load elongation rate (%) (K2-K1)/K1 x 100 (1) A method for measuring the 5N constant load elongation rate will be described later.
  • the conductive fabric 1 preferably has a resistance variation rate of 30% or less when stretched by 40%.
  • the resistance value variation rate is 30% or less, so that the conductive fabric 1 has a small variation in resistance value before and after stretching (that is, the resistance value change due to stretching). fluctuation is small), the conductive stability is enhanced. Thereby, the sensitivity of the said sensor can be improved by using the conductive cloth 1 for a sensor, for example.
  • the lower limit of the resistance variation rate at 40% elongation in the conductive fabric 1 is not particularly limited, but is usually about 5%.
  • the rate of change in resistance value at 40% elongation is the rate of change (%) in the resistance value before and after the conductive fabric 1 is stretched by 40%, and is measured by a method described later.
  • the thickness of the conductive fabric 1 is preferably 0.6 mm or less, more preferably 0.5 mm or less. Since the thickness of the conductive cloth 1 is 0.6 mm or less, it is possible to suppress the generation of a step when the conductive cloth 1 is incorporated in another member such as a sensor. For example, when the conductive cloth 1 is incorporated in a sensor such as a steering wheel sensor of the steering wheel 500, it is possible to suppress the generation of a step in the sensor, so the conductive cloth 1 adversely affects the tactile sensation of the sensor. becomes nothing.
  • the lower limit of the thickness of the conductive cloth 1 is not particularly limited, and can be set as appropriate, for example, 0.1 mm.
  • Conductive fabrics (Examples 1 to 17) having the characteristic configuration of the present invention were produced, and various measurements and evaluations were performed.
  • conductive fabrics (Comparative Examples 1 to 4) not having the characteristic structure of the present invention were produced, and similar measurements and evaluations were performed.
  • the measurement and evaluation items were elongation at break, 5N constant load elongation rate, and resistance change rate at 40% elongation. Each item will be described below.
  • a test piece having a length of 150 mm and a width of 25 mm is taken from the conductive cloth.
  • a tensile tester AG-I/20kN-50kN autograph manufactured by Shimadzu Corporation
  • the chuck gap was measured when the test piece was elongated until a load of 5N was applied, and the 5N constant load elongation rate was calculated based on the following formula (2).
  • 5N constant load elongation rate (%) (distance between chucks when 5N load is applied)/100 x 100 (2)
  • the obtained 5N constant load elongation rate was evaluated according to the following evaluation criteria. 20% or more: + (good) 10% or more and less than 20%: +- (slightly poor) Less than 10%: - (defective)
  • the sample is elongated at a tensile speed of 40 mm per minute, and the elongation is stopped when the elongation rate is 40%.
  • the resistance value ( ⁇ ) between the marking distances was measured again with the m ⁇ tester (resistance value at 40% elongation), and the resistance variation rate at 40% elongation was calculated based on the following formula (3).
  • Resistance value change rate at 40% elongation (%) (initial resistance value - resistance value at 40% elongation) / initial resistance value ⁇ 100 (3)
  • the obtained resistance value fluctuation rate at 40% elongation was evaluated according to the following evaluation criteria. 30% or less: + (good) Over 30%: - (defective)
  • Example 1 After being crimped using two types of yarn, polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT), false twisting and DDW processing (relaxation heat treatment conditions: 160 ° C.) are applied, resulting in 33 dtex.
  • a crimped yarn of /24f (trade name: TEXBRID, manufactured by Teijin Frontier Co., Ltd.) was used as a core yarn.
  • a Cu/Sn alloy metal wire having a diameter of 50 ⁇ m was used as the conductive sheath thread.
  • a conductive yarn (covering yarn) shown in Table 1 was obtained by single covering the core yarn with a conductive sheath yarn at a winding number of 1500 (turns/m).
  • This conductive yarn and non-conductive yarn that is the same kind of yarn as the core yarn are used as warp and weft, and the texture is 2/2 twill weave, and the yarn density is 120 / 2.54 cm in the weft direction and 140 in the warp direction. It was woven so as to be 1/2.54 cm.
  • the ratio (a:b) of the number of conductive yarns (a) in the weft direction and the number of non-conductive yarns (b) is 1 as the ratio of the average values per unit length (30 mm) described above.
  • the ratio (a:b) of the number of conductive yarns (a) in the warp direction and the number of non-conductive yarns (b) in the warp direction is set to 1:20, and the above-mentioned
  • the distance between the conductive yarns was set to 3.6 mm in the direction (the warp direction in Example 1) in which the number of conductive yarns per unit area (warp 30 mm ⁇ weft 30 mm) was large.
  • the thickness of the conductive cloth was set to 0.25 mm.
  • the conductive fabric of Example 1 having the configuration shown in Table 1 was obtained.
  • the ratio (D1/D2) of the diameter (D1) of the conductive yarn and the diameter (D2) of the non-conductive yarn was 1.9 as shown in Table 1.
  • Examples 2 to 15 Comparative Examples 1 to 4> Material of core yarn in conductive yarn, fineness of core yarn (i.e. diameter), breaking elongation of core yarn, material of metal wire in conductive sheath yarn, diameter of metal wire, breaking elongation of metal wire, non-conductive yarn The material, the fineness (i.e.
  • Example 10 two types of yarns, polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT), were used as the core yarn of the conductive yarn, and after crimping, only false twisting was performed. A crimped yarn that has been processed and not subjected to DDW processing was used. The ratio (D1/D2) of the diameter (D1) of the conductive yarn and the diameter (D2) of the non-conductive yarn in the conductive fabrics of Examples 2 to 15 and Comparative Examples 1 to 4 is shown in Tables 1 to 3 and 5. shown in
  • Example 16 A 22 dtex/1 f polyethylene terephthalate yarn (manufactured by Toray Industries, Inc.) was used as a core yarn. A Cu/Si alloy metal wire with a diameter of 50 ⁇ m was used as the conductive sheath thread. A conductive yarn (covering yarn) shown in Table 4 was obtained by single covering the core yarn with a conductive sheath yarn at a winding number of 1000 (turns/m).
  • this conductive yarn and a polyethylene terephthalate insulating yarn of 84 dtex / 36 f as a non-conductive yarn ground yarn of the front texture, ground yarn of the back texture, and connecting yarn
  • a 26 gauge / 33 inch knitting machine Co., Ltd. (manufactured by Fukuhara Seiki Seisakusho), a double-sided jersey double knitting (circular knitting) with a course density of 31 (course/25.4 mm) and a well density of 33 (well/25.4 mm) was knitted.
  • the conductive yarn obtained above is knitted instead of part of the insulating yarn of the surface texture, and in this knitting, the ratio of the average value per unit length (30 mm) of the conductive yarn in the warp direction.
  • the ratio (a:b) of the number (a) and the number (b) of the insulating yarns was set to 1:5, and the distance between the conductive yarns in the warp direction was set to 4.0 mm. Moreover, the thickness of the conductive cloth was set to 0.54 mm.
  • Table 4 shows the ratio (D1/D2) between the diameter (D1) of the conductive yarn and the diameter (D2) of the non-conductive yarn in the conductive fabric of Example 16.
  • Example 17 A 56dtex/36f polyethylene terephthalate yarn (manufactured by Nanya Co., Ltd.) was used as a core yarn. A Cu/Si alloy metal wire with a diameter of 50 ⁇ m was used as the conductive sheath thread. A conductive yarn (covering yarn) shown in Table 4 was obtained by single covering the core yarn with a conductive sheath yarn at a winding number of 1000 (turns/m).
  • the conductive yarn obtained above is knitted instead of part of the insulating yarn, and in this knitting, the number of conductive yarns in the warp direction as a ratio of the average value per unit length (30 mm) (a ) and the number (b) of the insulating yarns (a:b) was set to 1:2, and the distance between the conductive yarns in the warp direction was set to 3.0 mm. Moreover, the thickness of the conductive cloth was set to 0.60 mm.
  • Table 4 shows the ratio (D1/D2) of the diameter (D1) of the conductive yarn and the diameter (D2) of the non-conductive yarn in the conductive fabric of Example 17.
  • the ratio (D1/D2) of the diameter (D1) of the conductive yarn and the diameter (D2) of the non-conductive yarn is 1.0 to 2.6, and in at least one of the warp direction and the weft direction of the fabric
  • the constant load elongation rate was 20% or more, and the stretchability was excellent.
  • Each of the conductive fabrics of Examples 1 to 17 has a resistance value fluctuation rate of 30% or less when stretched by 40%, and the resistance value fluctuation due to expansion and contraction is suppressed (excellent conductive stability )Met.
  • the breaking elongation of the core yarn is 70% or more, so that the 5N constant load elongation rate can be 20% or more and the resistance value fluctuation rate at 40% elongation can be 30% or less.
  • the diameter of the core yarn is preferably 125 ⁇ m or less
  • the diameter of the metal wire of the conductive sheath yarn is preferably 20 to 80 ⁇ m or less
  • the number of turns of the conductive sheath yarn in the conductive yarn is 1000.
  • the diameter of the non-conductive yarn is preferably 125 ⁇ m or less, and the distance between the conductive yarns in the direction in which the number of conductive yarns per unit area is large among the warp and weft directions is preferably 5 mm or less. It has been shown. It was also shown that the DDW-treated core yarns (Examples 1 to 9, 11 to 15) had a higher breaking elongation than the core yarn not subjected to DDW treatment (Example 10). In addition, it was shown that the conductive fabrics of Examples 16 and 17 made of knitted fabrics also exhibited the same effect as the conductive fabrics of Examples 1 to 15 made of woven fabric.
  • the ratio (a:b) of the number of conductive yarns (a) to the number of non-conductive yarns (b) is in the range of 1:2 to 1:40 in both the warp and weft directions of the fabric.
  • Comparative Example 1 which is outside (the number of conductive yarns is too small compared to the number of non-conductive yarns), the resistance value fluctuation rate at 40% elongation exceeds 30%, and the resistance value fluctuation due to stretching is suppressed. It was not done.
  • Example 2 Comparison where the number ratio (a:b) is outside the range of 1:2 to 1:40 in both the warp and weft directions of the fabric (the number of conductive yarns is too large relative to the number of non-conductive yarns)
  • the 5N constant load elongation rate was less than 10%, and the stretchability was extremely poor.
  • the conductive fabric was broken when measuring the resistance value variation rate at 40% elongation, so it could not be measured, and the conductivity at the time of stretching necessary for functioning as a conductive fabric was imparted. It was not done.
  • Comparative Example 3 in which the ratio (D1/D2) of the diameter (D1) of the conductive yarn and the diameter (D2) of the non-conductive yarn is more than 2.6, has a 5N constant load elongation rate of less than 20% and stretches It was of poor quality.
  • Comparative Example 4 in which the ratio (D1/D2) is less than 1.0, the resistance value fluctuation rate at 40% elongation is more than 30%, and the resistance value fluctuation due to expansion and contraction is not suppressed. Ta.
  • the conductive fabric of the present invention can be used, for example, in vehicle interiors such as steering wheels, clothing such as outerwear, pants, and gloves, health and medical equipment such as massage chairs and care beds, and furniture such as chairs and sofas. It can be used as a sensor.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Woven Fabrics (AREA)

Abstract

L'invention concerne un tissu conducteur qui présente une excellente élasticité et une excellente stabilité conductrice. Un tissu conducteur 1 comprend un textile ou un matériau tricoté qui comprend des fils conducteurs 200 et des fils non conducteurs 300, le fil conducteur 200 étant un fil de revêtement formé par enroulement d'un fil de gaine conducteur 220 qui comprend un fil métallique sur un fil de noyau étirable 210 ; le fil non conducteur 300 étant un fil multifilament étirable ; le rapport (D1/D2) du diamètre (D1) du fil conducteur 200 au diamètre (D2) du fil non conducteur 300 étant de 1,0 à 2,6 ; et le rapport (a:b) du nombre (a) de fils conducteurs 200 au nombre (b) de fils non conducteurs 300 étant de 1:2 à 1:40 dans au moins une direction de chaîne ou une direction de trame du tissu conducteur.
PCT/JP2022/046574 2022-02-22 2022-12-19 Tissu conducteur WO2023162424A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05214646A (ja) * 1992-02-04 1993-08-24 Toyobo Co Ltd 制電性を有する伸縮性経編地
JP2006284276A (ja) * 2005-03-31 2006-10-19 Fukui Prefecture 感圧センサーシート
JP2010261143A (ja) * 2009-04-09 2010-11-18 Toyota Boshoku Corp 布材の製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05214646A (ja) * 1992-02-04 1993-08-24 Toyobo Co Ltd 制電性を有する伸縮性経編地
JP2006284276A (ja) * 2005-03-31 2006-10-19 Fukui Prefecture 感圧センサーシート
JP2010261143A (ja) * 2009-04-09 2010-11-18 Toyota Boshoku Corp 布材の製造方法

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