WO2012066390A1 - Multilayer fabric protection against electromagnetic fields - Google Patents

Multilayer fabric protection against electromagnetic fields Download PDF

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Publication number
WO2012066390A1
WO2012066390A1 PCT/IB2010/055774 IB2010055774W WO2012066390A1 WO 2012066390 A1 WO2012066390 A1 WO 2012066390A1 IB 2010055774 W IB2010055774 W IB 2010055774W WO 2012066390 A1 WO2012066390 A1 WO 2012066390A1
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Prior art keywords
metallized
fabric
fabrics
frequencies
ghz
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PCT/IB2010/055774
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French (fr)
Inventor
Alexis Benoit
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Alexis Benoit
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Publication date
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Publication of WO2012066390A1 publication Critical patent/WO2012066390A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • 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
    • D03D11/00—Double or multi-ply fabrics not otherwise provided for
    • 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

Definitions

  • the present invention relates to a device for increasing the attenuation power towards electromagnetic fields, in particular for frequencies from 1 MHz to 100 GHz and more particularly for frequencies above 1 GHz, metallized fabrics or metallized wire fabrics, in particular retaining good breathability and great flexibility of the fabric.
  • Metallized fabrics today are limited in their ability to reduce the size of their mesh which can not be reduced to infinity.
  • Current metallized fabrics are also limited by their metal density.
  • Current metallized fabrics are therefore limited to make a good electromagnetic screen or to attenuate high frequencies from 0.5 GHz, and more particularly beyond 5 Ghz.
  • the attenuating power of such a fabric is not significantly interesting in terms of attenuation, whereas the rigidity and breathability of this fabric becomes quickly a problem, besides the wire of metal or the metal aggregated to the fabric which then becomes brittle.
  • the fabric becomes rigid thus limiting the advantage of the flexible and flexible fabric. Moreover, the passage of air and light of such a fabric becomes zero.
  • the device overcomes these disadvantages.
  • the principle is the use of two or more thicknesses of metallized fabrics, superimposed on each other, and being in contact or not with each other, to offer a:
  • FIG. 1 is a profile view of the device of the invention for two thicknesses
  • FIG. 2 is a profile view of the device of the invention for three thicknesses
  • FIG. 4 is a profile of a variant of the invention for three thicknesses for example, where the fabric thicknesses are interconnected by a metallized or non-metallized wire, during the manufacture of the fabric or after its manufacture.
  • the device comprises at least two thicknesses of metallized fabrics, FIG. 1 to FIG. 3, allowing increased attenuation towards the frequencies, in particular for frequencies from 1 MHz to 100 GHz and more particularly for frequencies greater than 500. MHz.
  • the received initial (Ol) power wave (P1) is attenuated by the first metallized fabric thickness (E1).
  • the received secondary wave (02) of power (P2) is attenuated by the second thickness of metallized fabric (E2).
  • the device also makes it possible to reduce the size of the mesh of the metallised fabric, and therefore to increase the frequency spectrum that can be attenuated, ie frequencies that are higher and higher starting from 1 MHz, more particularly from 500 MHz.
  • the wavelengths (L) less than the wavelength (Lm) can be stopped by the size of the mesh (T) of a thickness of metallized fabric, will be able to pass through meshes with a thickness of metallized fabric, but they will not be able to pass through two layers of metallized fabric.
  • the superposition of two thicknesses of metallized fabric statistically results in a reduction in the size of the overall mesh for the two thicknesses of metallized fabric, ie at a global mesh size (T2), with statistically T2 less than or equal to 5 x T / 6, and T2 greater than or equal to T / 2.
  • T2 global mesh size
  • Increasingly higher frequencies will be able to be attenuated with more and more metallized fabric thicknesses, by the same principle of multiplication of the number of metallized fabric thicknesses (1), as indicated in FIG. 2 or FIG. 3.
  • the device according to the invention is particularly intended for the protection of living beings, living areas, speakers, and scientific instruments to be protected from electromagnetic fields.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Professional, Industrial, Or Sporting Protective Garments (AREA)

Abstract

The invention relates to a device for increasing the attenuating power of metallized fabrics or fabrics with metallized yarns in relation to: electromagnetic fields, especially for frequencies from 1 MHz to 100 GHz, and more particularly for frequencies above 1 GHz; and electric fields. The invention relates to a device that can be used to reduce the size of the metallized fabric mesh and to increase the attenuating power of the metalized fabric and the frequency spectrum that can be attenuated, while retaining the suppleness, flexibility and breathability of the initial fabric. The device is formed by two or more fabric layers stacked on top of one another, said layers being optionally arranged in parallel and optionally in contact with one another. The device of the invention is particularly suitable for protecting living organisms, enclosures, dwellings and scientific instruments that have to be shielded from electromagnetic fields, especially waves, microwaves and high frequencies, and electric fields.

Description

PROTECTION TISSUS MULTIPLES EPAISSEURS CONTRE CHAMPS PROTECTION MULTIPLE FABRICS THICKNESS AGAINST FIELDS
ELECTROMAGNETIQUES ELECTROMAGNETIC
La présente invention concerne un dispositif pour augmenter le pouvoir d'atténuation envers les champs électromagnétiques, notamment pour des fréquences de 1 MHz à 100 GHz et plus particulièrement pour des fréquences supérieures à 1 GHz, des tissus métallisés ou des tissus à fils métallisés, en conservant une bonne respirabilité et la grande souplesse du tissu. The present invention relates to a device for increasing the attenuation power towards electromagnetic fields, in particular for frequencies from 1 MHz to 100 GHz and more particularly for frequencies above 1 GHz, metallized fabrics or metallized wire fabrics, in particular retaining good breathability and great flexibility of the fabric.
Les tissus métallisés actuels sont limités dans leur pouvoir atténuant par la taille de leur maille qui ne peut être réduite à l'infini. Les tissus métallisés actuels sont limités également par leur densité de métal. Les tissus métallisés actuels sont donc limités pour faire un bon écran électromagnétique ou pour atténuer les hautes fréquences à partir de 0.5 GHz, et plus particulièrement au delà de 5 Ghz. Lors de très fortes puissance d'émissions pour des fréquences de 1 MHz à 100 GHz, l'atténuation des tissus métallisés est bien souvent très insuffisante voir inexistante, d'autant plus que les fréquences sont hautes et fortes. Metallized fabrics today are limited in their ability to reduce the size of their mesh which can not be reduced to infinity. Current metallized fabrics are also limited by their metal density. Current metallized fabrics are therefore limited to make a good electromagnetic screen or to attenuate high frequencies from 0.5 GHz, and more particularly beyond 5 Ghz. At very high transmitting power for frequencies from 1 MHz to 100 GHz, the attenuation of metallized fabrics is often very insufficient or nonexistent, especially since the frequencies are high and strong.
Si l'on densifie la teneur en métal du tissu métallisé, notamment via les fils métallisé, le pouvoir atténuant d'un tel tissu n'est significativement pas intéressant en terme d'atténuation, alors que la rigidité et la respirabilité de ce tissu devient vite un problème, outre le fil de métal ou le métal agrégé au tissu qui devient alors cassant.  If the metal content of the metallized fabric is densified, in particular via the metallised wires, the attenuating power of such a fabric is not significantly interesting in terms of attenuation, whereas the rigidity and breathability of this fabric becomes quickly a problem, besides the wire of metal or the metal aggregated to the fabric which then becomes brittle.
Si l'on réduit la taille de la maille du tissu métallisé, le tissus devient rigide limitant alors l'avantage du tissu souple et flexible. Par ailleurs, le passage de l'air et de la lumière d'un tel tissu devient nul.  If the size of the mesh of the metallized fabric is reduced, the fabric becomes rigid thus limiting the advantage of the flexible and flexible fabric. Moreover, the passage of air and light of such a fabric becomes zero.
En conséquence la protection aux champs électromagnétiques actuelle offerte par les tissus métallisés dans des confections telles que les baldaquins, les rideaux, les vêtements, les draps, les tentures murales, les enceintes respirantes cage de faraday, n'est pas satisfaisante, tant pour les champs électriques, que pour de fortes puissances d'ondes à partir de 1MHz, plus particulièrement au delà de 0.5 GHz, ou encore pour l'atténuation de hautes fréquences au delà de 5 Ghz, fréquences qui sont actuellement utilisées de plus en plus pour les télécommunications sans fils. L'utilisation des tissus métallisés est restreinte. As a result, the current electromagnetic field protection offered by metallized fabrics in garments such as canopies, curtains, clothes, sheets, wall hangings, breathable enclosures faraday cage, is not satisfactory, both for electric fields, than for strong wave powers from 1 MHz, more particularly beyond 0.5 GHz, or for the attenuation of high frequencies beyond 5 Ghz, frequencies which are currently used more and more for wireless telecommunications. The use of metallized fabrics is restricted.
Le dispositif permet de remédier à ces inconvénients. Le principe est l'utilisation de deux ou plusieurs épaisseurs de tissus métallisés, superposées les une aux autres, et étant en contact ou non les unes avec les autres, pour offrir une : The device overcomes these disadvantages. The principle is the use of two or more thicknesses of metallized fabrics, superimposed on each other, and being in contact or not with each other, to offer a:
une importante augmentation de la puissance d'atténuation du tissu métallisé par une diminution de la puissance de l'onde reçu, pour des fréquences de 1 MHz à 100 GHz, et également pour des champs électriques forts via la superposition de deux ou plusieurs épaisseurs de tissu métallisé,  a significant increase in the attenuation power of the metallized fabric by a decrease in the power of the received wave, for frequencies from 1 MHz to 100 GHz, and also for strong electric fields via the superposition of two or more thicknesses of metallized fabric,
une importante augmentation du spectre de fréquence pouvant être atténuées, pour des fréquences de 1 MHz à 100 GHz, particulièrement pour les fréquences supérieures à 500 MHz, au moyen d'une forte diminution de la taille globale de la maille du tissu métallisé via la superposition de deux ou plusieurs épaisseurs de tissu métallisé,  a significant increase in the frequency spectrum that can be attenuated, for frequencies from 1 MHz to 100 GHz, particularly for frequencies above 500 MHz, by means of a sharp decrease in the overall size of the mesh of the metallized fabric via the overlay two or more layers of metallized fabric,
une bonne conservation de la souplesse, de la flexibilité et la de respirabilité du tissu initial.  good preservation of flexibility, flexibility and breathability of the initial tissue.
Les dessins annexés illustrent l'invention : The accompanying drawings illustrate the invention:
- la figure 1 représente de profil le dispositif de l'invention pour deux épaisseurs la figure 2 représente de profil le dispositif de l'invention pour trois épaisseurs la figure 3 représente de profil le dispositif de l'invention pour n épaisseurs, avec y=0 jusqu'à l'infini  FIG. 1 is a profile view of the device of the invention for two thicknesses FIG. 2 is a profile view of the device of the invention for three thicknesses FIG. 3 is a profile of the device of the invention for n thicknesses, with y = 0 to infinity
la figure 4 représente de profil une variante de l'invention pour trois épaisseurs par exemple, où les épaisseurs de tissus sont reliées entre elles par un fil métallisé ou non métallisé, lors de la fabrication du tissu ou après sa fabrication. En référence à ces dessins, le dispositif comporte au moins deux épaisseurs de tissus métallisés, figure 1 à figure 3, permettant une atténuation augmentée envers les fréquences, notamment pour des fréquences de 1 MHz à 100 GHz et plus particulièrement pour des fréquences supérieures à 500 MHz. FIG. 4 is a profile of a variant of the invention for three thicknesses for example, where the fabric thicknesses are interconnected by a metallized or non-metallized wire, during the manufacture of the fabric or after its manufacture. With reference to these drawings, the device comprises at least two thicknesses of metallized fabrics, FIG. 1 to FIG. 3, allowing increased attenuation towards the frequencies, in particular for frequencies from 1 MHz to 100 GHz and more particularly for frequencies greater than 500. MHz.
1. L'onde initiale reçue (Ol) de puissance (PI) est atténuée par la première épaisseur de tissu métallisé (El). Le métal absorbe environ la moitié de la puissance de l'onde reçue (Pl)/2 et re-émet l'autre moitié (Pl)/2, soit l'onde secondaire (02) de puissance (P2)=(Pl)/2 vers la seconde épaisseur de tissu métallisé (E2). L'onde secondaire reçue (02) de puissance (P2) est atténuée par la deuxième épaisseur de tissu métallisé (E2). Le métal absorbe environ la moitié de la puissance de l'onde reçue (P2)/2 et re-émet l'autre moitié (P2)/2, soit l'onde tertiaire (03) de puissance (P3)=(P2)/2=(Pl)/4, qui est à nouveau reçue par la troisième épaisseur de tissu métallisé (E3) si il y en a une, et ainsi de suite en fonction du nombre d'épaisseurs de tissus.  1. The received initial (Ol) power wave (P1) is attenuated by the first metallized fabric thickness (E1). The metal absorbs about half of the power of the received wave (P1) / 2 and re-emits the other half (P1) / 2, the secondary wave (O2) of power (P2) = (P1) / 2 to the second thickness of metallized fabric (E2). The received secondary wave (02) of power (P2) is attenuated by the second thickness of metallized fabric (E2). The metal absorbs about half of the power of the received wave (P2) / 2 and re-emits the other half (P2) / 2, the tertiary wave (03) of power (P3) = (P2) / 2 = (Pl) / 4, which is again received by the third metallized tissue layer (E3) if there is one, and so on depending on the number of tissue thicknesses.
2. Le dispositif permet également de réduire la taille de la maille du tissu métallisé, et donc d'augmenter le spectre de fréquence pouvant être atténuées, soient des fréquences de plus en plus hautes à partir de 1 MHz, plus particulièrement à partir de 500 MHz. Les longueurs d'ondes (L) inférieure à la longueur d'onde (Lm) pouvant être stoppée par la taille de la maille (T) d'une épaisseur de tissu métallisé, vont pouvoir passer au travers des mailles d'une épaisseur de tissu métallisé, mais elles ne vont pas pouvoir passer au travers de deux épaisseurs de tissu métallisé. En effet, la superposition de deux épaisseurs de tissu métallisé aboutissent statistiquement à une réduction de la taille de la maille globale pour les deux épaisseurs de tissu métallisé, soit à une taille de maille globale (T2), avec statistiquement T2 inférieure ou égale à 5 x T / 6, et T2 supérieure ou égale à T / 2.
Figure imgf000005_0001
Des fréquences de plus en plus hautes vont pouvoir être atténuée avec de plus en plus d'épaisseurs de tissu métallisé, par le même principe de multiplication du nombre d'épaisseurs de tissu métallisé (1), comme indiqué sur la figure 2 ou la figure 3. La superposition de n épaisseurs de tissu métallisé, avec n=2 jusqu'à l'infini, aboutissent statistiquement à une réduction de la taille de la maille globale (Tn) pour les n épaisseurs de tissus métallisé, avec statistiquement Tn inférieure ou égale à T x ( 5 / 6 ) puissance n, et Tn supérieure ou égale à T x n / 2. n x T < Tn < ( 5 ) x11 ' 2. The device also makes it possible to reduce the size of the mesh of the metallised fabric, and therefore to increase the frequency spectrum that can be attenuated, ie frequencies that are higher and higher starting from 1 MHz, more particularly from 500 MHz. The wavelengths (L) less than the wavelength (Lm) can be stopped by the size of the mesh (T) of a thickness of metallized fabric, will be able to pass through meshes with a thickness of metallized fabric, but they will not be able to pass through two layers of metallized fabric. Indeed, the superposition of two thicknesses of metallized fabric statistically results in a reduction in the size of the overall mesh for the two thicknesses of metallized fabric, ie at a global mesh size (T2), with statistically T2 less than or equal to 5 x T / 6, and T2 greater than or equal to T / 2.
Figure imgf000005_0001
Increasingly higher frequencies will be able to be attenuated with more and more metallized fabric thicknesses, by the same principle of multiplication of the number of metallized fabric thicknesses (1), as indicated in FIG. 2 or FIG. 3. The superposition of n metallized tissue thicknesses, with n = 2 up to infinity, statistically results in a reduction in overall mesh size (Tn) for the n metallized tissue thicknesses, with statistically lower Tn or equal to T x (5/6) power n, and Tn greater than or equal to T xn / 2. nx T <Tn <(5) x 11 '
2 ( 6 ) n  2 (6) n
Le dispositif selon l'invention est particulièrement destiné à la protection des êtres vivants, de lieux de vie, des enceintes, et des instruments scientifiques devant être à l'abri des champs électromagnétiques. The device according to the invention is particularly intended for the protection of living beings, living areas, speakers, and scientific instruments to be protected from electromagnetic fields.

Claims

REVENDICATIONS
1) Dispositif pour augmenter le pouvoir d'atténuation des tissus métallisés ou des tissus à fils métallisés envers les champs électromagnétiques, notamment pour des fréquences de 1 MHz à 100 GHz et plus particulièrement pour des fréquences supérieures à 0.5 GHz, et pour les champs électriques ; Le dispositif est caractérisé par deux ou plusieurs épaisseurs de tissu métallisé ou a fil métallisé (1), superposées les unes sur les autres, étant parallèles ou non les unes par rapport au autres, et étant en contact ou non les unes avec les autres, 1) Device for increasing the attenuation power of metallized fabrics or metallized fabrics to electromagnetic fields, especially for frequencies from 1 MHz to 100 GHz and more particularly for frequencies greater than 0.5 GHz, and for electric fields ; The device is characterized by two or more layers of metallized fabric or metallized wire (1), superimposed on each other, being parallel or otherwise with respect to one another, and being in contact or not with each other,
2) Dispositif selon la revendication 1) caractérisé par un tissu confectionné lors du processus de fabrication ou après, par superposition de deux ou plusieurs épaisseurs de tissu métallisé ou à fil métallisé (1), et reliés entre eux lors de la fabrication du tissus multi-épaisseurs ou après sa fabrication au moyen d'un fil métallisé ou non (2), formant au final un seul tissu.  2) Device according to claim 1) characterized by a fabric made during the manufacturing process or after, by superposition of two or more thicknesses of metallized fabric or metallized wire (1), and interconnected during the manufacture of multi tissue thicknesses or after its manufacture by means of a wire metallized or not (2), ultimately forming a single fabric.
3) Dispositif selon la revendication 1) et 2) caractérisé par la réalisation de tout moyen de protection contre les champs électromagnétiques et l'irradiation.  3) Device according to claim 1) and 2) characterized by the realization of any means of protection against electromagnetic fields and irradiation.
4) Dispositif selon la revendication 1) et 2) et 3) caractérisé en la fabrication ou la confection de vêtements, de combinaisons, de baldaquins, de draps, de rideaux, de tentures, d'étoffes, de cage de faraday.  4) Device according to claim 1) and 2) and 3) characterized in the manufacture or manufacture of clothing, combinations, canopies, sheets, curtains, draperies, fabrics, faraday cage.
PCT/IB2010/055774 2010-11-15 2010-12-13 Multilayer fabric protection against electromagnetic fields WO2012066390A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1004421A FR2967424B1 (en) 2010-11-15 2010-11-15 MULTI-THICKNESS FABRIC PROTECTION FOR ATTENUATION AND ELIMINATION OF ELECTROMAGNETIC FIELD IRRADATION, IN PARTICULAR FOR (HIGH) FREQUENCIES (1MHZ AT 100 GHZ)
FR10/04421 2010-11-15

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4439768A (en) * 1978-11-02 1984-03-27 Bayer Aktiengesellschaft Metallized sheet form textile microwave screening material, and the method of use
JP2001003264A (en) * 1999-06-21 2001-01-09 Suminoe Textile Co Ltd Magnetic wave-insulating three-dimensional structural body and its production
WO2001063029A1 (en) * 2000-02-18 2001-08-30 Euro-Shelter Electromagnetic multiwall fabric
WO2004048005A1 (en) * 2002-11-21 2004-06-10 M-I L.L.C. Vibratory screen
US20070159753A1 (en) * 2006-01-09 2007-07-12 Randall Michael S System for EMI/RFI filtering and transient voltage suppression
WO2009088380A1 (en) * 2008-01-11 2009-07-16 Boyteks Tekstil Sanayi Ve Ticaret A.S. Fabric that has the property of shielding electromagnetic fields

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4439768A (en) * 1978-11-02 1984-03-27 Bayer Aktiengesellschaft Metallized sheet form textile microwave screening material, and the method of use
JP2001003264A (en) * 1999-06-21 2001-01-09 Suminoe Textile Co Ltd Magnetic wave-insulating three-dimensional structural body and its production
WO2001063029A1 (en) * 2000-02-18 2001-08-30 Euro-Shelter Electromagnetic multiwall fabric
WO2004048005A1 (en) * 2002-11-21 2004-06-10 M-I L.L.C. Vibratory screen
US20070159753A1 (en) * 2006-01-09 2007-07-12 Randall Michael S System for EMI/RFI filtering and transient voltage suppression
WO2009088380A1 (en) * 2008-01-11 2009-07-16 Boyteks Tekstil Sanayi Ve Ticaret A.S. Fabric that has the property of shielding electromagnetic fields

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FR2967424B1 (en) 2013-10-18

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