Classifications

• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D1/00—Woven fabrics designed to make specified articles
  • D03D1/0035—Protective fabrics
  • D03D1/0058—Electromagnetic radiation resistant
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D13/00—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D13/00—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft
  • D03D13/008—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft characterised by weave density or surface weight
• • 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
  • D03D15/43—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 with differing diameters
• • 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
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2101/00—Inorganic fibres
  • D10B2101/20—Metallic fibres
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • D10B2321/04—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of halogenated hydrocarbons
  • D10B2321/042—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of halogenated hydrocarbons polymers of fluorinated hydrocarbons, e.g. polytetrafluoroethene [PTFE]
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
  • D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
  • D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
  • D10B2331/021—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides aromatic polyamides, e.g. aramides
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
  • D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2401/00—Physical properties
  • D10B2401/04—Heat-responsive characteristics
  • D10B2401/041—Heat-responsive characteristics thermoplastic; thermosetting
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2401/00—Physical properties
  • D10B2401/16—Physical properties antistatic; conductive

Definitions

• the present invention relates to a fabric for electromagnetic shielding.
• these cables being crossed by an electric current, they emit an electromagnetic field which is disruptive for their environment. It is also appropriate that these cables are not disturbed by any electromagnetic fields. In other words, it is necessary to prevent a signal from escaping the cable and also to prevent a spurious signal from being added to the signal carried by the same cable.
• the conductive cables are integrated in an aircraft, motor vehicle or other device and, consequently, may be brought into contact with mechanical devices of the apparatus in question. During operation, vibrations may occur which cause cycles of friction between the cables and the surrounding members to be observed; these vibrations can damage the cables.
• the electric cables are protected by sheaths that provide electromagnetic shielding and mechanical protection.
• electromagnetic shielding sheath there is known, for example, from document EP 1 348 247, an electromagnetic shielding braid which provides both electromagnetic shielding - of the order of 50/60 dB at 30/40 MHz - and a quality mechanical protection.
• sheaths Unlike braided sheaths, these sheaths consist of woven ribbons.
• the warp yarns comprise conductive metal strands to provide the shielding function, while the weft yarns comprise thermoformable mono filamentary strands to provide the self-holding function of the tubular-shaped sheath.
• these self-sealing woven sheaths can be relatively heavy, which is a handicap for this type of sheaths especially for aeronautical applications.
• an object of the invention is to provide a light self-resealing fabric having an electromagnetic shielding efficiency close to the values of a braided tubular metal sheath, 50-60dB at 30 / 40MHz.
• the invention relates to an electromagnetic shielding fabric having a weave of intertwined weft and warp yarns, characterized in that the conductive warp yarns comprise monofilament or multifilament yarns associated with metal strands and in that at least one conductive warp is inserted in a weft pattern to create an equipotential bond perpendicular to the direction of the warp yarns.
• the fabric comprises a plurality of conductive chain son inserted in a chain in a pitch of between 1 and 8 in the crowds.
• the fabric comprises chain conductive yarns forming a protective face electromagnetic, warp son forming a mechanical protection face and warp son binding the chain conductor son forming the electromagnetic shielding face and warp son forming the mechanical protection face.
• warp conductor son forming the electromagnetic shielding face are woven in a plain weave and the warp son forming a mechanical protection face are woven in a plain weave.
• the ratio of the diameters of the monofilaments and metal strands in the warp yarns is at least 2.5.
• the diameter of the monofilaments is of the order of 0.125 mm to 0.40 mm and the diameter of the metal strands is of the order of 0.05 mm to 0.16 mm.
• the weft threads consist of one or more materials from the group comprising: PET; PET-FR; PBT; PMMA; PA4.6; PA6.6; PA1 1; PA12; PPS; PEEK; ECTFE; PVDF; ETFE FEP; PFA; PTFE.
• the warp threads associated with the metal strands consist of one or more materials from the group comprising: PET; PBT; PMMA; polyethylene; polyamides; acrylic; carbons; PAN; polypropylene; PPS; polyimides; PEEK; ECTFE; PVDF; Fluorofibres; glass fibers; ceramic and mineral fibers, aramid and meta-aramid fibers; Copper bare or coated with tin, nickel, silver; bare or tinned brass; Aluminum, aluminum alloys, bare steel, zinc-plated steel, tin-plated copper steel, nickel-plated steel, silver-plated brass, stainless steel, inconel®, Monel®, nickel and nickel alloys, Cupro-Nickel alloys;
• the fabric receives a coating layer of one or more elements of the group comprising copper, zinc, nickel or silver.
• the invention relates to a sheath formed by the aforementioned fabric.
• the sheath comprises a conductive strip of conductive warp threads inserted by weaving into the plain weave on the mechanical protective face so that the conductive strip is covered by the opposite side of the electromagnetic shield side of the sheath. and constitutes a looping of the electrical circuit of the electromagnetic protection face when the sheath is closed on itself.
• Figure 1 is a schematic view of the weave of a fabric according to one embodiment of the invention.
• Figure 2 is a schematic view of the fabric during weaving
• Figures 3 and 4 show a double weave fabric incorporating the warp thread taken in frame respectively in schematic view and in armor drawing;
• Figures 5 to 8 show four shielding measurements on a triaxial bench according to the provisions of IEC 62153-4-3 for, respectively, a sheath of the prior art and three sheaths using three embodiments of fabric according to the invention.
• the fabric 1 for electromagnetic shielding has an armor of weft son 2 and warp son 3 intertwined.
• the warp threads 3 comprise conductive strands associated with textile fibers.
• the 3-conductor warp yarns may comprise monofilament yarns associated with metal strands.
• the metal strands can be incorporated in monofilament son by wrapping, stranding or braiding.
• the ratio of the diameters of the monofilaments and metal strands in the warp threads may be at least 2.5 mm.
• the diameter of the monofilaments is of the order of 0.25 mm and the diameter of the metal strands is of the order of 0.15 mm.
• the weft yarns 2 may be conductive yarns but, preferably, are nonconductive yarns essentially composed of thermoplastic monofilaments, for example PET; PET-FR; PBT; PMMA; PA4.6; PA6.6; PA1 1; PA12; PPS; PEEK; ECTFE; PVDF; ETFE FEP; PFA; PTFE so that the fabric incorporating these weft son 2 has a linear density contained.
• thermoplastic monofilaments for example PET; PET-FR; PBT; PMMA; PA4.6; PA6.6; PA1 1; PA12; PPS; PEEK; ECTFE; PVDF; ETFE FEP; PFA; PTFE so that the fabric incorporating these weft son 2 has a linear density contained.
• Figure 2 shows how the first fabric manufacturing step of the invention is performed. As shown in this figure, it is provided at a predetermined pitch P which can be, for example, 8 picks, according to the example of Figure 1, to insert a warp 4 - which is therefore conductive - in the frame.
• a predetermined pitch P which can be, for example, 8 picks, according to the example of Figure 1, to insert a warp 4 - which is therefore conductive - in the frame.
• the loom has a lower weft insertion needle 6 and an upper weft insertion needle 7; these needles will thus allow to insert in the frame composed of non-conductive son, a son of chain which is conductive.
• a needle which has a profile allowing it to take according to the thread which is presented to it, the weft thread and the warp which is conductive.
• the fabric according to the invention is provided with a conductive thread in its weft direction which thus forms an equipotential bond.
• the resulting fabric has an interweaving of conductive son, which is very favorable for the electromagnetic efficiency.
• the fabric After weaving, the fabric undergoes a treatment phase essentially by heating known per se to give it its shape memory property, that is to say its ability to wind on itself.
• Figure 3 shows another embodiment of the invention in which the fabric has two faces which appear visually different so as to distinguish the functions of mechanical protection and electromagnetic protection.
• the fabric is woven according to the double weaving method with a particular binding yarn.
• Figure 3 shows schematically the weave of the fabric with the double weave. This particular method is combined with the conductive warp thread 30 inserted into the weave of an electromagnetic shielding face.
• Figure 3 shows a loose bonding which is used in this example; the conductive son of the chain are grouped in a weave weave type to form the electromagnetic shielding face, monofilament or multifilament son of the chain 31 are grouped in a weave weave type to form the mechanical protection face.
• the two weaves are linked by son of chains 32 chosen monofilaments or multifilaments to form the binding.
• the binding son 32 is visible on the mechanical protection side and invisible electromagnetic protection side.
• FIG. 3 shows an electromagnetic shielding measurement for a cladding composed, according to the prior art, of a fabric having (i) 0.10 mm 8-stranded tinned copper wires and 0.25 mm PET monofilaments and (FIG. ii) in weft PET thermoplastic monofilaments with a diameter of 0.254 mm.
• Figure 6 shows an electromagnetic shielding measurement made with the fabric shown in Figure 1.
• This fabric comprises (i) PET textile yarns and 0.10 mm 8-stranded tinned copper strands and (ii) weft PET thermoplastic monofilaments and chain metal wires in a pitch of eight picks.
• the measurements carried out within the framework of the aforementioned standard show an attenuation of the order of 42 dB at 30 MHz and 40 dB at a frequency of 40 MHz.
• Figure 7 shows an electromagnetic shielding measurement made with a variant of the fabric shown in Figure 1.
• This fabric comprises (i) PET textile yarns and 0.10 mm 8-strand tinned copper strands and (ii) weft PET thermoplastic monofilaments and warp wires inserted on each pick. Measurements made in the framework of the aforementioned standard show attenuation of the order of 48dB at 30MHz and 45dB for a frequency of 40 MHz.
• a metal coating on the fabric can be performed by electrochemical deposition according to known techniques. A thickness in an interval of 0.2 ⁇ to 1 .3 ⁇ is deposited according to the desired level of attenuation of shielding.
• Figure 8 shows an electromagnetic shielding measurement made with a variant of the fabric shown in Figure 1, the latter having received a nickel coating.
• This fabric comprises (i) PET textile yarns and 0.10 mm 8-stranded tinned copper strands, (ii) weft PET thermoplastic monofilaments and chain metal wires inserted in a pitch of eight picks and (iii) ) a metallized coating electrochemically deposited on a thickness of about 0.7 ⁇ , knowing that the coating may have a thickness in 0.2 m to 1 .3 ⁇ .
• Measurements made within the framework of the aforementioned standard show attenuation of the order of 56 dB at 30 MHz and 55.5 dB at a frequency of 40 MHz.
• the sheath which is formed by a fabric band closed on itself comprises a conductive strip of conductive warp threads inserted by weaving into the plain weave on the mechanical protection face so that the conductive strip is covered by the opposite side side electromagnetic protection side of the sheath and constitutes a looping of the electrical circuit of the electromagnetic protection face when the sheath is closed on itself.
• the invention is not limited to the embodiments described for a fabric (Taffeta), for example, but it encompasses all embodiments such as Twill, Satin, Reps, Reps across ( fluted), Long Reps, Plaiting Armor (Panama) etc.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Woven Fabrics (AREA)
• Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=51894117

Family Applications (1)

Country Status (10)

Families Citing this family (7)

Family Cites Families (15)

• 2014
  • 2014-06-16 FR FR1455480A patent/FR3022266B1/fr not_active Expired - Fee Related
• 2015
  • 2015-06-15 PT PT15733840T patent/PT3155152T/pt unknown
  • 2015-06-15 KR KR1020167034909A patent/KR102539372B1/ko active Active
  • 2015-06-15 WO PCT/FR2015/051584 patent/WO2015193602A1/fr not_active Ceased
  • 2015-06-15 CA CA2951360A patent/CA2951360C/fr active Active
  • 2015-06-15 US US15/319,509 patent/US10392728B2/en active Active
  • 2015-06-15 MX MX2016016715A patent/MX357189B/es active IP Right Grant
  • 2015-06-15 ES ES15733840.1T patent/ES2691397T3/es active Active
  • 2015-06-15 TR TR2018/15274T patent/TR201815274T4/tr unknown
  • 2015-06-15 EP EP15733840.1A patent/EP3155152B1/de active Active

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