Fabric for electromagnetic shielding

• US 10,392,728 B2
• Filed: 06/15/2015
• Issued: 08/27/2019
• Est. Priority Date: 06/16/2014
• Status: Active Grant

• Current Assignee: Tresse Industrie
• Original Assignee: Tresse Industrie
• Inventors: Clement, Gilles, Omerin, Pierre
• Primary Examiner(s): Steele, Jennifer A
• Application Number:
  US15/319,509
• Publication Number:
  US 20170321353A1
• Time in Patent Office: 1,534 Days
• CPC Class Codes: D03D 1/0058 Electromagnetic radiation resistant
• CPC Class Codes: D03D 13/00 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
• CPC Class Codes: D03D 13/008 characterised by weave density or surface weight
• CPC Class Codes: D03D 15/43 with differing diameters
• CPC Class Codes: D10B 2101/20 Metallic fibres
• CPC Class Codes: D10B 2321/042 polymers of fluorinated hydrocarbons, e.g. polytetrafluoroethene [PTFE]
• CPC Class Codes: D10B 2331/02 polyamides D10B2331/08 takes precedence
• CPC Class Codes: D10B 2331/021 aromatic polyamides, e.g. aramides
• CPC Class Codes: D10B 2331/04 polyesters, e.g. polyethylene terephthalate [PET]
• CPC Class Codes: D10B 2401/041 thermoplastic; thermosetting
• CPC Class Codes: D10B 2401/16 antistatic; conductive

Abstract

The invention relates to a fabric for electromagnetic shielding having a weave of interlaced weft threads (2) and warp threads (3). In addition, the warp threads (3) are conductive and include multi-filament or mono-filament textile conductors associated with metal strands and at least one conductive warp thread (4) is inserted into a weft such as to create equipotential bonding perpendicular to the direction of the warp threads (3).

Claims

1. A fabric for electromagnetic shielding presenting a weave of interwoven weft threads and warp threads, wherein the weft threads are non-conductive and wherein the warp threads are conductive and comprise multifilament or monofilament textile conductive threads having metal strands and in that, at least one conductive warp thread is weft inserted within the non-conductive weft threads to create an equipotential connection perpendicular to the direction of the warp threads.

2. The fabric for electromagnetic shielding according to claim 1, wherein the at least one conductive warp thread is several conductive warp threads weft inserted according to a pitch P comprised between 1 and 8 in the sheds.

3. The fabric for electromagnetic shielding according claim 1, wherein the fabric comprises conductive warp threads forming an electromagnetic protection face, warp threads forming a mechanical protection face and warp threads ensuring the bonding of the conductive warp threads forming the electromagnetic protection face and the warp threads forming the mechanical protection face.

4. The fabric according to claim 3, wherein the conductive warp threads forming the electromagnetic protection face are woven according to a plain weave and the warp threads forming a mechanical protection face are woven according to a plain weave.

5. The fabric for electromagnetic shielding according to claim 1, wherein the ratio of the diameters of the monofilaments and of the metal strands in the conductive warp threads is of at least 2.5.

6. The fabric for electromagnetic shielding according to claim 5, wherein the diameter of the monofilaments is in the range of 0.125 mm to 0.40 mm and the diameter of the metal strands is in the range of 0.05 mm to 0.16 mm.

7. The fabric for electromagnetic shielding according to claim 1, wherein the at least one conductive warp thread inserted within the weft thread is constituted by one or several material(s) of the group comprising:

PET;

PET-FR;

PBT;

PMMA;

PA4.6;

PA6.6;

PA11;

PA12;

PPS;

PEEK;

ECTFE;

PVDF;

ETFE FEP;

PFA;

PTFE.

8. The fabric for electromagnetic shielding according to claim 1, wherein the fabric receives a metal layer having a thickness comprised between 0.2 μ

m and 1.3 μ

m.

9. The fabric for electromagnetic shielding according to claim 8, wherein the metal layer comprises one or several metal(s) of the group comprising nickel and zinc and copper and silver.

10. The fabric for electromagnetic shielding according to claim 1, wherein the warp threads are constituted by strands of one or several material(s) of the group comprising:

PET;

PBT;

PMMA;

polyethylene;

Polyamides;

acrylics;

carbons;

PAN;

polypropylene;

PPS;

polyimides;

PEEK;

ECTFE;

PVDF;

Fluorofibers;

glass fibers;

ceramic and mineral fibers, aramid and meta-aramid fibers;

bare or tin-coated Copper, nickel, silver, bare or tin-plated brass;

Aluminum, aluminum alloys, bare steel, zinc-plated steel, tin-plated copper-plated steel, nickel-plated copper-plated steel, silver-plated copper-plated steel, inox, inconel®

, Monel ®

, nickel, nickel alloys, Copper-Nickel alloys.

11. An electromagnetic shielding sheath comprising a fabric strip according to claim 1.

12. The sheath according to claim 11, wherein the fabric further comprises conductive warp threads forming an electromagnetic protection face, warp threads forming a mechanical protection face and warp threads ensuring the bonding of the conductive warp threads forming the electromagnetic protection face and the warp threads forming the mechanical protection face and wherein the sheath comprises a conductive strip of conductive warp threads inserted by weaving in the plain weave on the mechanical protection face so that the conductive strip is covered by the opposite face on the electromagnetic protection face side of the sheath and constitutes a closure of the electrical circuit of the electromagnetic protection face when the sheath is closed on itself.

13. The fabric for electromagnetic shielding according to claim 3, wherein the at least one conductive wrap thread is several conductive warp threads warp-inserted according to a pitch P comprised between 1 and 8 in the sheds.

14. The fabric according to claim 13, wherein the conductive warp threads forming the electromagnetic protection face are woven according to a plain weave and the warp threads forming the mechanical protection face are woven according to a plain weave.

15. The fabric for electromagnetic shielding according to claim 14, wherein the ratio of the diameters of the monofilaments and of the metal strands in the conductive warp threads is of at least 2.5.

16. The fabric for electromagnetic shielding according to claim 15, wherein the diameter of the monofilaments is in the range of 0.125 mm to 0.40 mm and the diameter of the metal strands is in the range of 0.05 mm to 0.16 mm.

17. The fabric for electromagnetic shielding according to 15, wherein the thermoplastic monofilaments included in the weft threads are constituted by one or several material(s) of the group comprising:

PET;

PET-FR;

PBT;

PMMA;

PA4.6;

PA6.6;

PA11;

PA12;

PPS;

PEEK;

ECTFE;

PVDF;

ETFE FEP;

PFA;

PTFE.

18. The fabric for electromagnetic shielding according to claim 17, wherein the fabric receives a metal layer having a thickness comprised between 0.2 μ

m and 1.3 μ

m.

19. The fabric for electromagnetic shielding according to claim 18, wherein the warp threads are constituted by strands of one or several material(s) of the group comprising:

PET;

PBT;

PMMA;

polyethylene;

Polyamides;

acrylics;

carbons;

PAN;

polypropylene;

PPS;

polyimides;

PEEK;

ECTFE;

PVDF;

Fluorofibers;

glass fibers;

ceramic and mineral fibers, aramid and meta-aramid fibers;

bare or tin-coated Copper, nickel, silver, bare or tin-plated brass;

Aluminum, aluminum alloys, bare steel, zinc-plated steel, tin-plated copper-plated steel, nickel-plated copper-plated steel, silver-plated copper-plated steel, inox, inconel®

, Monel®

, nickel, nickel alloys, Copper-Nickel alloys.

20. An electromagnetic shielding sheath comprising a fabric strip according to claim 19, wherein the sheath comprises a conductive strip of conductive warp threads inserted by weaving in the plain weave on the mechanical protection face so that the conductive strip is covered by the opposite face on the electromagnetic protection face side of the sheath and constitutes a closure of the electrical circuit of the electromagnetic protection face when the sheath is closed on itself.