JP2011508408A - Electromagnetic shielding material - Google Patents

Abstract

An electromagnetic shielding material having a paper fiber layer and a conductive layer bonded to the surface of the paper fiber layer is provided. These components form a laminated body, and when arranged so as to be sandwiched between the receiving antenna of the RFID smart chip and the transmitting antenna of the signal generator, the signal reading of the chip is hindered. The present invention also provides a security article that includes an electromagnetic shielding material having at least one conductive layer and at least one substrate disposed so as to be in contact therewith, and capable of electromagnetically shielding an RFID smart chip. An RFID smart chip comprising a step of preparing an electromagnetic shielding material and disposing the electromagnetic shielding material at a position adjacent to the RFID smart chip, preferably between the RFID smart chip and the transmission antenna of the RFID signal generator. A method is provided for electromagnetically shielding.

Description

    The present invention relates to a material that is capable of performing electromagnetic shielding on a device that can read electromagnetic waves of a specific frequency such as a radio frequency individual identification (RFID). Regarding provision.

  A widely known system employing RFID technology is called an RFID “tag” that enables data to be read using a dedicated reader. Such tags include one or more computer chips (“smart chips”) and an antenna connected to the smart chip for transmitting information encoded in the smart chip to a reader. With the miniaturization of smart chips used, RFID technology has come to be used in a wider variety of devices, particularly in the consumer goods industry. In addition, RFID systems are becoming more common in everyday life as RFID technology is becoming more cost effective in various types of businesses that require goods to be stored, shipped and tracked.

  Furthermore, the use of FRID technology is also spreading in the field of tracking and identifying people. For example, people are said to be able to identify people more efficiently when they pass a predetermined passing point, but RFID tags are incorporated into passports, personal identification cards, bank cards, and commuter pass tickets. Is being considered. In fact, at the airport, it is now possible to board the aircraft before departure by passing the credit card through the terminal device in the airline service box at the airport, and it is also necessary to use a bank card to purchase the ticket It is gone.

  The “efficiency” provided by RFID systems often results in misunderstanding and misuse of information that should be handled with care, and in some cases for obvious theft purposes. If it is possible to charge a bank card account by simply holding a smart chip built-in card or stick over the front surface of the RFID reader, the user can personally use such an RFID reader The risk of unintentional reading increases by inadvertently placing a coin purse or wallet in the immediate vicinity of the surface. Also, when using a certain bank card to approve billing, other bank cards with built-in smart chips may be read (whether intended or not), resulting in multiple purchases per purchase. There is a risk of being charged.

  In addition, when a large number of readers are available and their use becomes easier, it is possible to read the cautionary information recorded on the smart chip built-in card so that someone who is unscrupulous is not known to the cardholder. There is a possibility that it will end up. For example, it is well known to install a small camera on an automatic teller machine (ATM) to take a video of a person entering a PIN. Similarly, a small reader may be installed to read information encoded and recorded on the chip. For example, when many people open their wallets and coin purses and look into them, they stand at the ATM so that they do not see the contents of their purses or coin purses. However, if you have a reader that is placed in an inconspicuous place near the ATM and is remotely controlled, you can protect it even if you think that it protects your belongings well from the eyes of others Unencoded encoded information can be read directly and easily.

  Therefore, there is a need for a means that allows the user to manage the information by freely obstructing or avoiding reading of the information encoded on the chip using the RFID technology.

  As an example, the present invention provides an electromagnetic shielding material. This material includes a first paper fiber layer and a conductive layer disposed so as to be in contact with the first paper fiber layer. The polymer film may be disposed so as to contact the surface of the conductive layer. With such an arrangement, a laminated structure that can prevent reading of the RFID smart chip is obtained when it is arranged between the reception antenna of the RFID smart chip and the transmission antenna of the RFID signal generator.

  As another embodiment, the present invention provides an electromagnetic shielding material including a laminate having a metallized polymer film and a first paper fiber layer and a second paper fiber layer sandwiching the metallized polymer film. This stack also prevents reading of the RFID smart chip when placed between the receiving antenna of the RFID smart chip and the transmitting antenna of the RFID signal generator.

  As another embodiment, the present invention provides an electromagnetic shielding material having a laminated structure. This laminated structure is composed of a combination of paper, polymerized film, and / or electrical conductor, and prevents reading of the RFID smart chip. In this embodiment, as in the other embodiments of the present invention, a laser printer, an ink jet printer, an offset printing machine, a digital printer, a flexographic printing machine, or handwriting using a writing instrument is applied on paper. Printing or writing may be performed depending on the method.

  As yet another embodiment, the present invention provides a security article capable of electromagnetically shielding an RFID smart chip. The security article includes an electromagnetic shielding material having one or more conductive layers and one or more substrates in contact therewith. The instrument may take any form, such as an envelope, holder, chassis, sleeve, paper / card compartment, wallpaper, or the like. The instrument may be integrated into a portable instrument such as a wallet, coin purse, handbag, travel bag, computer bag, pocket pad, or the like. When the electromagnetic shielding material is disposed between the reception antenna of the RFID smart chip and the transmission antenna of the RFID signal generator, reading of the RFID smart chip is prevented by the electromagnetic shielding material.

  As yet another embodiment, the present invention provides a method for electromagnetically shielding an RFID smart chip. In this method, an electromagnetic shielding material having at least an electric conductor is provided, and the electromagnetic shielding material is disposed adjacent to the RFID smart chip and preferably between the RFID smart chip and the transmitting antenna of the RFID signal generator. Is done. As a result, the RFID signal transmitted from the signal generator to the receiving antenna of the RFID smart chip is obstructed, obstructed, or stopped by the electromagnetic shielding material, and the RFID smart chip is electromagnetically shielded.

  As an effect of the present invention, personal information encoded in a device that can be read via RFID (that is, RFID smart chip) cannot be read without the consent of the owner of the personal information. Specifically, the electromagnetic shielding material placed adjacent to the smart chip significantly hinders the transmission and reception of signals propagating electromagnetic fields by plane waves, and the reading device can reliably read the information recorded on the smart chip. Disable. By disabling this capability, anyone who carries a device with a built-in RFID smart chip (eg, passport, personal identification card, credit card, commuter pass, prepaid card, gift card, or the like) You can have a sense of security that your information is not read without your consent. Code and information will not be read without the user's explicit permission.

  When the smart chip is included in a small instrument carried by the user (eg, printed material), the electromagnetic shielding material according to the present invention holds the instrument including the RFID smart chip, envelope, holder, sleeve, etc. It may take the form of a similar paper product. Additionally or alternatively, the electromagnetic shielding material may take the form of a sheet and be placed at a location adjacent to the smart chip. In any embodiment, envelopes, holders, sleeves, and other similar paper products may be subjected to various forms of printing, embossing, coloring, cutting, punching, and / or folding. . In addition, a coating process may be performed on the paper, or such a process may not be performed. Most papers can be used in the present invention as long as they have the light paper properties. When electromagnetic shielding material is used in the form of an envelope or other material holder, the contents of the material can be read visually even if it is not opened by providing a transparent or translucent small window on the envelope or other material holder. It may be possible.

  When a smart chip is included in a relatively large device that cannot be easily carried, the electromagnetic shielding material according to the present invention is used to shield the housing of the device and the entire room where the device is placed. Also good. For example, in the case of computer hard drives, recording media, and other similar electronic devices, the housing of those electronic devices may be lined with an electromagnetic shielding material, covered from the outside, or integrated. . As a specific example of such a case, for example, a computer case, a computer box, or the like can be considered. As other cases, drum-type bags, large bags, pallet-packed instruments, and the like are also conceivable. The electromagnetic shielding material may be further provided as wallpaper, heat insulating material, or other paper product lined on the ceiling or floor.

FIG. 1 is an exploded perspective view of an electromagnetic shielding material according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of an electromagnetic shielding material according to another embodiment of the present invention. FIG. 3 is a side sectional view of an electromagnetic shielding material according to another embodiment shown in FIG. FIG. 4 is a side sectional view of an electromagnetic shielding material according to another embodiment shown in FIG. FIG. 5 is a perspective view of an electromagnetic shielding material according to another embodiment of the present invention. FIG. 6 is a side view of an electromagnetic shielding material having a three-layer structure in which a conductor layer sandwiches a polymerized film. FIG. 7 is a side view of the electromagnetic shielding material shown in FIG. 6 when the conductor layer is integrated with the polymer film having a three-layer structure. FIG. 8 is a schematic view showing reading of an RFID shielded by an electromagnetic shielding material according to the present invention. FIG. 9 is a schematic view showing an instrument using the electromagnetic shielding material according to the present invention. FIG. 10 is a schematic view showing another instrument in which the electromagnetic shielding material according to the present invention is used.

  A specific example of an electromagnetic shielding material identified by reference numeral 10 will be described below with reference to FIG. The electromagnetic shielding material 10 is a four-layer laminate including a first paper fiber layer 12, a polymerized film 14, a conductive layer 16 and a second paper fiber layer 18. Each of the first paper fiber layer 12, the polymer film 14, the conductive layer 16, and the second paper fiber layer 18 is bonded with an adhesive 20 so that the surfaces thereof are in contact with other adjacent layers.

  Both the first paper fiber layer 12 and the second paper fiber layer 18 are fiber materials. As an example, such fiber material is made of one or more of natural fibers (such as cotton), synthetic fibers, and / or recycled fibers, but is not limited thereto. Moreover, in order to give such a fiber material at least desirable opacity, a filler may be included. If necessary, one or both of the first paper fiber layer 12 and the second paper fiber layer 18 may be colored. Here, the paper includes synthetic paper, artificial paper, and the like. The paper may be subjected to a coating treatment or may not be subjected to such a treatment.

  Any suitable polymer material may be used for the polymer film 14. For example, the polymer film 14 may be polylactic acid (polylactide) (a polymer made from corn D-type glucose, known as PLA), polyester, polypropylene, combinations thereof, and the like. However, it is not limited to them.

  Examples of materials for paper fibers and polymerized films are described in US Pat. No. 6,926,968 invented by Roldi as well as in US Pat. No. 6,926,968 invented by Rordi. The whole is taken in as reference information.

  Any suitable conductive material may be used for the conductive layer 16. In one embodiment, the conductive layer 16 is a metal foil whose thickness is adjusted so as to cause interference, obstruction, or obstruction of nearby radio signals. In addition, the metal foil contributes to providing a certain degree of opacity to the electromagnetic shielding material 10. In such embodiments, for example, aluminum is used as the metal, but other metals (for example, copper, silver, nickel, and the like in the form of elements or alloys) may be employed in the present invention. Good. By using a metal as the metal foil, the electromagnetic shielding material 10 can be easily folded and formed.

  In another embodiment, the conductive layer 16 is metal particles attached to at least one of the polymerized film 14 and the second paper fiber layer 18. The metal particles may be aluminum (for example, elemental aluminum), an aluminum alloy, an aluminum mixture, or other metal (for example, copper, silver, nickel, or the like). In yet another embodiment, the conductive layer 16 is a woven or non-woven metal fiber.

  In still another embodiment, the conductive layer 16 may be made of a non-metal such as carbon, a carbon-supporting matrix material, graphite, a combination thereof, or the like. Carbon nanotubes may be used in the form of single-wall or double-wall. When carbon nanotubes are used as the conductive layer 16, the carbon nanotubes may be deposited by any suitable technique as long as the thickness of the conductive layer can be precisely adjusted, such as chemical vapor deposition or the like. .

  In still other embodiments, the adhesive 20 may itself be a conductor. In that case, an adhesive mixed with an appropriate conductive material is used. Examples of such a mixture include, but are not limited to, fine particles, powders, granules, beads, combinations thereof, or similar metals. As the metal, either aluminum (for example, elemental aluminum), an aluminum alloy, or an aluminum mixture may be employed, or other metals (for example, copper, silver, nickel, or the like) may be employed. Also good.

  The adhesive 20 used to bond the first paper fiber layer 12, the polymer film 14, the conductive layer 16, and the second paper fiber layer 18 to form a laminate is, for example, a 100% solid adhesive. However, the present invention is not limited in this regard, and other types of adhesives may be used in the present invention. For example, any one of a solvent-type adhesive, a water-based adhesive, a hot-melt adhesive, an ultraviolet curable adhesive, an electron beam curable adhesive, a combination thereof, or the like may be adopted as the adhesive 20. Good.

  When 100% solid adhesive is used to laminate the first paper fiber layer 12, polymerized film 14, conductive layer 16 and second paper fiber layer 18, breakage between the paper fiber layer and the polymerized film Gluing is performed. Destructive adhesion refers to adhesion such that when a T-shaped peel adhesion test is performed after curing, the paper fiber layer and the polymerized film cannot peel the paper fiber layer from the polymerized film without causing damage to the paper fiber layer. .

  As an example of a 100% solid adhesive, there is a low-temperature type (having fluidity at a room temperature of about 100 degrees Fahrenheit) and a two-component mixed type. Alternatively, a one-pack type high-temperature type (gel-like at room temperature and requiring heating to give fluidity) may be used. The adhesive is selected according to the adhesive penetration rate and strength (power that can withstand adhesion) of the paper fiber used. Generally, a high temperature type adhesive is used when there is anxiety about the permeability and strength of paper, and a low temperature type adhesive is used when the permeability and strength are not so much of a problem. When 100% solid adhesive is used, the lamination process is performed by a conventional lamination technique.

  FIG. 2 shows an electromagnetic shielding material according to another embodiment identified by reference numeral 110. The electromagnetic shielding material 110 is a laminate composed of a first paper fiber layer 112, a polymer film 114, an electric conductor 116, and a second paper fiber layer 118. The first paper fiber layer 112 and the polymer film 114 are bonded by an adhesive 120 so as to be in contact with each other. The conductor 116 is impregnated or integrated into the polymerized film 114 to form a metallized polymerized film, so that it is not necessary to attach the conductor to the polymerized film. The second paper fiber layer 118 is bonded to the polymer film 114 (including the conductor 116) with an adhesive 120.

  In the electromagnetic shielding material 110, the first paper fiber layer 112 and the second paper fiber layer 118 are both fiber materials (as in the above-described embodiment), and the polymer film 114 has sufficient dimensional stability. Polyester, polypropylene, and the like, which are materials having heat resistance, shrinkage properties, homogeneity, adhesion to paper fiber layers, and heat resistance.

  As the conductor 116 in the electromagnetic shielding material 110, a granular material of an appropriate conductor such as aluminum, copper, silver, nickel, alloys thereof, and other similar metal powders is used. As the electrical conductor 116, carbon, a carbon-supporting matrix material, non-metal such as graphite or carbon nanotube, a combination thereof, a combination of the above metals with them, or a similar one may be used. In this embodiment, the conductors 116 may be uniformly distributed over the entire polymer film 114 as shown in FIG. 3, or may be arranged biased to one surface side of the polymer film as shown in FIG. May be.

  FIG. 5 shows an electromagnetic shielding material according to another embodiment identified by reference numeral 210. The electromagnetic shielding material 210 is a three-layer laminate of a paper fiber layer 212, a polymerized film 214 and a conductive layer 216. The conductive layer 216 is sandwiched between the paper fiber layer 212 and the polymer film 214. However, the present invention is not limited in this respect, and the paper fiber layer 212 or the conductive layer 216 may be sandwiched between the other two layers. These three layers of the electromagnetic shielding material 210 are bonded together with an adhesive. For the conductive layer 216, aluminum, copper, silver, nickel, alloys thereof, or other similar metals are used. As the conductive layer 216, carbon, carbon nanotubes, a carbon-supporting matrix material, graphite, a combination thereof, a combination thereof with the above metals, or a similar one may be used.

  6 and 7 show an electromagnetic shielding material according to another embodiment identified by reference numeral 310. FIG. The electromagnetic shielding material 310 is a three-layer laminate of a first conductor 316, a second conductor 317, and a polymer film 314 sandwiched between them. In the electromagnetic shielding material 310, the first conductor 316 and the second conductor 317 are both aluminum foil. However, the present invention is not limited in this respect, and at least one of the first conductor 316 and the second conductor 317 is a powder of aluminum, copper, silver, nickel, an alloy thereof, or a metal similar to them. It may be made of Further, carbon, a carbon-supporting matrix material, graphite, carbon nanotube, a combination thereof, or a nonmetal similar thereto may be used. In the electromagnetic shielding material 310, the first conductor 316 and the second conductor 317 are respectively bonded to different surfaces of the polymer film 314 as shown in FIG. 6, or as shown in FIG. It is integrated with the polymerized film and is arranged at a position biased near the outer surface of the polymerized film.

  FIG. 8 shows a diagram 40 for explaining the shielding ability of the electromagnetic shielding material 10 related to radio waves from the RFID. Hereinafter, the electromagnetic shielding material is assumed to be a four-layer laminate of a polymer film, a conductive layer, and two paper fiber layers sandwiched so as to cover them, but the present invention is not limited in this respect and disclosed in the present application. Any other electromagnetic shielding material may be used in the apparatus in the following description.

  The electromagnetic shielding material 10 is disposed so as to be sandwiched between the transmission antenna 42 and the reception antenna 44 in order to enhance the shielding capability. The signal generator 46 outputs an unmodulated sinusoidal RF signal to the power amplifier 48 at a predetermined frequency. The signal generated by the signal generator 46 is amplified at a predetermined frequency (13.56 MHz) according to the amplification factor set in advance in the power amplifier 48 and transmitted from the transmission antenna 42. As a result, the plane wave signal propagates in the electromagnetic field to the electromagnetic shielding material 10. Depending on the specifications of the instrument in which the electromagnetic shielding material 10 is incorporated, it is desirable that the signal to propagate is not received by the receiving antenna 44 attached to the RFID receiving unit 50 having the preamplifier 52 and the analyzer 54 arranged in the chip.

  Subsequently, in FIG. 9 and FIG. 10, reference numeral 60 indicates a security product in which the electromagnetic shielding material 10 according to the present invention is incorporated. In FIG. 9, a security product 60 includes an envelope (for example, a safety mail envelope, an arrival confirmation mail envelope, and the like), a protective sleeve, a chassis, a holder, wallpaper, and a machine-readable RFID card (for example, a bank). Cards, tolls, telephone cards, and the like), packaged medicines, and the like. When the security product 60 is an envelope, a sleeve with a protective function, a holder or the like, it is prepared by appropriately cutting, folding, gluing, or the like a sheet piece of the electromagnetic shielding material 10.

  In addition to the electromagnetic shielding material 10, the security article includes a substrate 62 disposed so as to be in contact therewith. The substrate 62 is paper, cardboard, polymer, or other material constituting an envelope, sleeve, chassis, holder, wallpaper, or the like that houses or shields the smart chip 66 of the RFID system. When the security article 60 is a wallpaper, the wallpaper may be reinforced with vinyl or a similar material.

  As shown in FIG. 10, in another embodiment, the substrate 62 is a machine-readable RFID card or the like that is directly integrated into the smart chip 66 of the RFID system. In any embodiment, the substrate 62 may be integrated with another article 70 structure. The article 70 is, for example, a coin purse, a wallet, a handbag, a pocket pad, clothing, a suitcase, and a computer bag. Further, the article 70 may be a room or an entire building. Furthermore, in any of the embodiments, if the electromagnetic shielding material 10 is disposed in the vicinity of the smart chip 66, a shielding effect on the smart chip can be obtained.

Example-Structure and shielding performance of electromagnetic shielding material Various combinations of paper fiber layers, polymerized films, and metals (contained in metal foil or polymerized film) having different compositions were tested for the shielding performance.

  In the above, the present invention has been described with reference to specific embodiments. However, various modifications may be made within the scope of the technical idea of the present invention, and a certain element can be replaced with another. It should be understood by those skilled in the art that elements may be substituted. In addition, necessary modifications may be made within the scope of the technical idea of the present invention in accordance with individual situations and materials to which the technology of the present invention is applied. Accordingly, the invention is not limited to the description of the specific embodiments described above in the detailed description, but all embodiments falling within the scope of the claims are included in the scope of the invention.

DESCRIPTION OF SYMBOLS 10 ... Electromagnetic shielding material, 12 ... 1st paper fiber layer, 14 ... Polymerized film, 16 ... Conductive layer, 18 ... 2nd paper fiber layer, 20 ... Adhesive, 42 ... Transmitting antenna, 44 ... Receiving antenna, 46 ... Signal generator, 48 ... Power amplifier, 50 ... RFID receiver, 52 ... Preamplifier, 54 ... Analyzer, 60 ... Security article, 62 ... Substrate, 66 ... Smart chip, 70 ... Article, 110 ... Electromagnetic shielding material, 112 ... 1st paper fiber layer, 114 ... polymer film, 116 ... electric conductor, 118 ... second paper fiber layer, 120 ... adhesive, 210 ... electromagnetic shielding material, 212 ... paper fiber layer, 214 ... polymer film, 216 ... Conductive layer, 310 ... electromagnetic shielding material, 314 ... polymer film, 316 ... first conductor, 317 ... second conductor

Claims (34)

A first paper fiber layer;
An electromagnetic shielding material comprising: a conductive layer bonded so as to be in contact with the surface of the first paper fiber layer. Comprising a polymerized film adhered to be in contact with the surface of the conductive layer;
The first paper fiber layer, the conductive layer, and the polymerized film form a laminate, and the laminate is disposed between the reception antenna of the RFID smart chip and the transmission antenna of the RFID signal generator. The electromagnetic shielding material according to claim 1, further comprising an ability to inhibit signal reading by the RFID smart chip. The electromagnetic shielding material according to claim 2, further comprising an adhesive for bonding between the conductive layer and the first paper fiber layer and between the polymerized film and the conductive layer. The adhesive is one or a combination of two or more selected from 100% solid adhesive, solvent-based adhesive, water-based adhesive, hot-melt adhesive, ultraviolet curable adhesive, and electron beam curable adhesive The electromagnetic shielding material according to claim 3. The electromagnetic shielding material according to claim 3, wherein the adhesive contains an electric conductor. The electromagnetic shielding material according to claim 1, wherein the first paper fiber layer includes a fibrous body selected from natural fibers, synthetic fibers, and recycled fibers. The electromagnetic shielding material according to claim 2, wherein the polymer film includes one or a combination of two or more selected from polylactic acid, polyester, and polypropylene. The electromagnetic shielding material according to claim 1, wherein the conductive layer includes one or a combination of two or more selected from metal foil, metal particles, carbon, and carbon nanotube. At least one of the metal foil and the metal particles is one or more selected from aluminum, copper, silver and nickel, or one or more selected from aluminum, copper, silver and nickel The electromagnetic shielding material according to claim 8, comprising an alloy containing The electromagnetic shielding material according to claim 2, further comprising a second paper fiber layer bonded so as to contact the surface of the polymerized film. A first paper fiber layer;
A metallized polymer film adhered to be in contact with the surface of the first paper fiber layer;
A second paper fiber layer bonded so as to be in contact with the surface of the metallized polymer film,
The first paper fiber layer, the metallized polymer film, and the second paper fiber layer form a laminate, and the laminate is between the receiving antenna of the RFID smart chip and the transmitting antenna of the RFID signal generator. An electromagnetic shielding material having an ability to inhibit reading of a signal by the RFID smart chip when placed on the RFID smart chip. The electromagnetic shielding material according to claim 11, wherein the metallized polymer film is adhered to the first paper fiber layer and the second paper fiber layer with an adhesive. The electromagnetic shielding material according to claim 11, wherein the adhesive has electrical conductivity. The electromagnetic shielding material according to claim 11, wherein the metallized polymer film includes a polymer film containing particles of a conductive material. The particles of the conductive material contain one or more combinations selected from aluminum, copper, silver and nickel, or one or more selected from aluminum, copper, silver and nickel. The electromagnetic shielding material according to claim 12, which is an alloy. A paper fiber layer,
A polymerized film;
An electrical conductor sandwiched between the paper fiber layer and the polymerized film,
The paper fiber layer, the polymerized film and the conductor form a laminate, and the laminate is disposed between the RFID smart chip receiving antenna and the RFID signal generator transmitting antenna. Electromagnetic shielding material with the ability to block the reading of signals by smart chips. The electromagnetic shielding material according to claim 16, further comprising an adhesive that adheres the paper fiber layer, the polymerized film, and the conductor to each other. The electromagnetic shielding material according to claim 17, wherein the adhesive contains an electric conductor. The conductor is one or a combination of two or more selected from aluminum, copper, silver and nickel, or an alloy containing one or more selected from aluminum, copper, silver and nickel. Item 17. The electromagnetic shielding material according to Item 16. A first conductor;
A second electrical conductor;
A polymerized film disposed between the first conductor and the second conductor;
The first conductor, the second conductor, and the polymer film form a laminate, and the laminate is disposed between the reception antenna of the RFID smart chip and the transmission antenna of the RFID signal generator. In the case, an electromagnetic shielding material having an ability to inhibit reading of signals by the RFID smart chip. At least one of the first conductor and the second conductor is selected from one or a combination of two or more selected from aluminum, copper, silver and nickel, or selected from aluminum, copper, silver and nickel The electromagnetic shielding material according to claim 20, wherein the alloy is an alloy containing one or more selected ones. The at least one of the first conductor and the second conductor is one or a combination of two or more selected from carbon, a carbon-supporting matrix material, graphite, and carbon nanotubes. Electromagnetic shielding material. The electromagnetic shielding material according to claim 20, wherein at least one of the first conductor and the second conductor is bonded to the polymerized film. The electromagnetic shielding material according to claim 20, wherein at least one of the first conductor and the second conductor is contained in the vicinity of the surface of the polymerized film. An electromagnetic shielding material having one or more conductive layers;
One or more substrates disposed in contact with the electromagnetic shielding material, wherein the electromagnetic shielding material is disposed between the reception antenna of the RFID smart chip and the transmission antenna of the RFID signal generator. A security product capable of electromagnetically shielding an RFID smart chip, which has the ability to inhibit reading of signals by the smart chip. The security article according to claim 25, comprising a non-conductive layer composed of a combination of one or two selected from paper and polymer. The one or more conductive layers are one or a combination of two or more selected from aluminum, copper, silver and nickel, or an alloy containing one or more selected from aluminum, copper, silver and nickel The security article according to claim 25, or any one or a combination of two or more selected from carbon, a carbon-supporting matrix material, graphite, and carbon nanotubes. The security article according to claim 25, wherein the one or more substrates are any one of a paper envelope, a sleeve, a chassis, and a holder that can accommodate the RFID smart chip. The security article according to claim 25, wherein the one or more substrates are wallpaper. The security article according to claim 25, wherein the substrate is integrated as a component in any of a wallet, a coin purse, a handbag, a pocket pad, clothing, a suitcase, and a computer bag. Providing an electromagnetic shielding material including at least an electric conductor;
Placing the electromagnetic shielding material in a position adjacent to the RFID smart chip;
Sandwiching the electromagnetic shielding material between the RFID smart chip and a transmission antenna of an RFID signal generator, and electromagnetically shielding the RFID smart chip. 32. The method of claim 31, wherein the electromagnetic shielding material comprises a laminate having one or more paper fiber layers and one or more polymerized films. 32. The method of claim 31, wherein the step of preparing the electromagnetic shielding material includes attaching the electromagnetic shielding material to an instrument that houses the document material to which the RFID smart chip is attached. 34. The method of claim 33, wherein the instrument for receiving the document material is any one selected from an envelope, a protective sleeve, a holder, a wallet, a coin purse, a handbag, and a room.

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