JP2022143184A - Rfid antenna, rfid inlay and rfid label - Google Patents

Abstract

To provide an RFID antenna, an RFID inlay, and an RFID label that can be recycled together with paper.SOLUTION: There is provided an RFID label in which an RFID inlay with an IC chip mounted on an antenna of an RFID antenna with an antenna made of a conductor formed on one surface of an inlay substrate and an adhesive layer for an adherend are laminated. The inlay substrate includes cellophane.SELECTED DRAWING: Figure 4

Description

The present invention relates to an RFID (Radio Frequency Identification) antenna, an RFID inlay having an IC mounted thereon, and an RFID label provided with the RFID inlay.

In modern society, it is becoming more and more important to deal with environmental problems. Efforts to protect the environment are carried out not only at the individual level but also at the company or group level, and the way in which they approach the environment is one of the criteria that expresses the company's attitude. It has come to be recognized that it is natural for companies to carry out environmental conservation activities in addition to their normal business activities.

Examples of environmental conservation activities include recycling in which resources after use are collected and reused after changing their shape, and reuse in which resources are used as they are. It can be said that it is a mission imposed on modern companies to provide products that are easy to recycle or reuse.

A recycling system that collects and recycles used paper and cardboard boxes has been functioning for a long time, but it is predicted that the number of RFID labels that read and write information by wireless communication will increase rapidly in the future. In this case, the number of cardboard boxes that are collected with the RFID label attached will increase. The RFID label has an RFID inlay with an RFID antenna formed on the surface of the PET film. If the cardboard with the RFID label attached is recycled, the PET film pieces will be mixed with the paper and the quality of the recycled paper will deteriorate. cause.

Patent Literature 1 discloses an RFID label that does not affect the quality of recycled paper even when attached to an adherend such as a cardboard box. This RFID label has a structure in which the part where the RFID inlay is laminated can be easily removed from the state in which it is attached to the adherend, and the label containing the removed RFID inlay can be separated as plastic waste.

JP 2009-069935 A

The RFID label of Patent Document 1 contributes to maintaining the quality of recycled paper by peeling off the RFID inlay, but it is necessary to peel off the part containing the RFID inlay for each RFID label, which complicates the work. This may hinder labor saving. SUMMARY OF THE INVENTION It is an object of the present invention to provide a recyclable RFID antenna, RFID inlay and RFID label together with paper.

The present invention relates to an RFID antenna in which an antenna made of a conductor is formed on one surface of an inlay base material, the inlay base material containing cellophane.
In the RFID antenna, the conductor is preferably a metal foil. Further, in the RFID antenna, the cellophane is preferably moisture-proof cellophane.

Further, the present invention provides an RFID inlay in which an antenna made of a conductor is formed on one surface of an inlay base material and an IC chip is mounted on the antenna of the RFID inlay, wherein the inlay base material contains cellophane. Regarding.
Preferably, in the RFID inlay, the conductor is a metal foil.
Further, in the RFID inlay, the cellophane is preferably moisture-proof cellophane.

Furthermore, the present invention provides an RFID antenna in which an antenna made of a conductor is formed on one surface of an inlay base material, and an RFID inlay in which an IC chip is mounted on the antenna, and an adhesive layer for an adherend are laminated. An RFID label, wherein said inlay substrate comprises cellophane.
It is preferable that a laminate label comprising a label substrate and an adhesive layer for lamination is laminated on the RFID inlay side of the RFID label.
Further, it is preferable that a protective label comprising a protective substrate and an adherend adhesive layer is laminated on the adherend adhesive layer side of the RFID label.
A laminate label consisting of a label substrate and an adhesive layer for lamination is laminated on the RFID inlay side of the RFID label, and a protective substrate and an adhesive layer for an adherend are laminated on the adhesive layer side for an adherend. It is preferable that the protective label is laminated.
Preferably, in the RFID label, the conductor is a metal foil.
Moreover, in the RFID label, it is preferable that the cellophane of the inlay base material is moisture-proof cellophane.

Since the RFID antenna, RFID inlay and RFID label of the present invention use cellophane as the base film of the RFID antenna, paper such as cardboard can be recycled with the RFID label attached. Contamination of foreign matter in recycled paper obtained as a result of recycling can be avoided, and the quality of recycled paper can be maintained. There is no need to peel off part or all of the RFID label prior to recycling work, which contributes to labor saving.

1 is a plan view showing an embodiment of an RFID antenna according to the present invention; FIG. FIG. 2(a) is a sectional view of the RFID antenna taken along line II-II shown in FIG. 1, and FIG. 2(b) is a sectional view of the RFID inlay. 1 is a cross-sectional view showing an embodiment of an RFID label according to the present invention; FIG. FIG. 4 is a cross-sectional view showing another embodiment of an RFID label according to the present invention; FIG. 4 is a cross-sectional view showing another embodiment of an RFID label according to the present invention; FIG. 4 is a cross-sectional view showing another embodiment of an RFID label according to the present invention; FIG. 4 is a cross-sectional view showing another embodiment of an RFID label according to the present invention; FIG. 4 is a cross-sectional view showing another embodiment of an RFID label according to the present invention; FIG. 4 is a cross-sectional view showing another embodiment of an RFID label according to the present invention; FIG. 4 is a cross-sectional view showing another embodiment of an RFID label according to the present invention; It is sectional drawing which shows the modification of this invention.

[RFID antenna and RFID inlay]
An RFID antenna 1 according to an embodiment of the present invention will be described.
FIG. 1 is a plan view for explaining an RFID antenna 1 according to this embodiment, and FIG. 2(a) is a sectional view taken along line II-II of FIG. FIG. 2(b) is a cross-sectional view of the RFID inlay, taken at the same position as in FIG. 2(a).

The RFID antenna 1 shown in FIG. 2(a) is obtained by forming an antenna pattern 4 with a metal foil 3 on the surface of a base film 2 which is an inlay substrate. The metal foil 3 is adhered to the base film 2 with an antenna bonding adhesive layer 5 . The RFID inlay 10 shown in FIG. 2(b) has an IC chip 6 mounted on an antenna pattern 4 made of a conductor.

For the base film 2, for example, a film containing cellophane can be used. It is particularly preferable to use cellophane in which the dry weight ratio (biomass degree) of the biomass raw material, which is an organic resource of biological origin, is 80% or more. Moisture-proof cellophane can also be used as the cellophane. Here, the moisture-proof cellophane is cellophane coated with a resin for the purpose of moisture-proof processing on the surface of cellophane. Examples of resins that can be used here include acrylic resins, vinyl chloride resins, vinyl chloride-vinyl acetate copolymers, and polyvinylidene chloride. For cellophane, for example, products of Rengo Co., Ltd. or Futamura Chemical Co., Ltd. can be used. Moisture-proof cellophane, for example, a product of Futamura Chemical Co., Ltd. can be used.

The thickness of the base film 2 is determined from the viewpoint of the strength for forming the antenna pattern 4 made of a conductor on the base film 2 and mounting the IC chip 6, and from the viewpoint of the use of the base film 2 itself as a label substrate. In order to correspond to the example, the thickness is preferably 10 μm or more and 300 μm or less. The thickness of the base film 2 can be appropriately selected within the above range depending on the design and application of the product manufactured using the RFID inlay 10 .

The antenna pattern 4 includes a loop portion 11 to which the IC chip 6 is mounted, an IC chip connection portion 12 to which the IC chip 6 is connected, meanders 13 and 14 extending symmetrically from the loop portion 11, and meanders 13 and 14. Capacitor hats 15 and 16 connected to the ends are provided. That is, the RFID antenna 1 illustrated in FIG. 1 is a UHF band dipole antenna.

The antenna pattern 4 made of the metal foil 3 is adhered to the base film 2 with an antenna bonding adhesive layer 5 as shown in FIG. As the adhesive for the antenna bonding adhesive layer 5, for example, an acrylic adhesive, a urethane adhesive, a silicone adhesive, a rubber adhesive, or the like can be used. In this embodiment, the UV-curable adhesive is transferred and printed in a desired shape using a plate, and the desired adhesive strength is obtained by UV irradiation. The adhesive is one size smaller than the outline of the antenna, and more specifically, it is transferred and printed with a margin of several tens to several hundreds of μm on the periphery.

In this embodiment, the antenna pattern 4 has an antenna length and an antenna width corresponding to the UHF band (300 MHz to 3 GHz, especially 860 MHz to 960 MHz).

Metal foils applicable to the RFID antenna 1 include, for example, copper and aluminum. From the viewpoint of suppressing manufacturing costs, it is preferable to use aluminum.

Moreover, the thickness of the metal foil is preferably 3 μm or more and 40 μm or less from the viewpoint of the overall thickness of the RFID inlay 10 or the overall thickness when formed on the RFID medium, and the manufacturing cost.

In the RFID inlay 10, the IC chip 6 is electrically and mechanically attached to the IC chip connection portion 12 in the center of the antenna pattern 4 by an anisotropic conductive material (not shown) such as an anisotropic conductive adhesive or an anisotropic conductive film. properly connected. The anisotropically conductive material is a mixture of a binder, which is an adhesive component, and a conductive filler (hereinafter referred to as a filler) prepared to have a predetermined particle size. electrically and mechanically connected.

[RFID label]
Next, an RFID label according to an embodiment of the invention will be described.

FIG. 3 is a cross-sectional view of an RFID label 20 according to one embodiment of the invention. The RFID label 20 shown in FIG. 2 is provided with an adherend adhesive layer 21 for sticking to an article such as a cardboard on the antenna of the RFID inlay 10 shown in FIG. It is a thing. A separator 22 is temporarily attached to the adherend adhesive layer 21 . A general-purpose adhesive can be used for the adherend adhesive layer 21 . Alternatively, the adhesive layer 21 for the adherend may be formed by laminating a double-sided tape. In the RFID label 20 having this cross-sectional structure, the base film 2 also serves as the label substrate.

The base film 2 is a film containing cellophane. It is particularly preferable to use cellophane in which the dry weight ratio (biomass degree) of the biomass raw material, which is an organic resource of biological origin, is 80% or more. In terms of dimensional stability, durability, and moisture resistance, it is desirable to use moisture-proof cellophane as the cellophane. Here, the moisture-proof cellophane is cellophane coated with a resin for the purpose of moisture-proof processing on the surface of cellophane. Examples of coating resins that can be used include acrylic resins, vinyl chloride resins, vinyl chloride-vinyl acetate copolymers, and polyvinylidene chloride. For cellophane, for example, products of Rengo Co., Ltd. or Futamura Chemical Co., Ltd. can be used. Moisture-proof cellophane is a product of Futamura Chemical Co., Ltd., for example.

This RFID label 20 reads and writes information to and from the IC chip 6 by communication, but it may be printed with an image receiving layer (not shown) on the surface, or information such as a bar code may be printed by a label printer.

If the RFID label 20 is attached to a paper box (not shown) such as a cardboard box, it can be recycled together with the paper box and does not need to be peeled off before the recycling operation. Furthermore, contamination of the recycled paper obtained by recycling is reduced, and it is possible to suppress deterioration of the purity of the recycled paper.

FIG. 4 is a cross-sectional view of an RFID label 30 according to another embodiment of the invention. The RFID label 30 shown in the figure is obtained by laminating a label 33 comprising a label substrate 31 and an adhesive layer 32 on the base film 2 side of the RFID label 20 shown in FIG. The surface of the label 33 becomes a printing surface 34 on which information such as a bar code is printed by a label printer. The label base material 31 is appropriately selected according to the use of the RFID label 30, but on the premise that it will be recycled together with an adherend such as a cardboard box, it is desirable to use a paper base material for the label base material 31. .

FIG. 5 is a cross-sectional view of an RFID label 40 according to another embodiment of the invention. The RFID label 40 shown in FIG. 3 has a label 43 (a label 43 ( protective label). The label base material 41 is laminated for the purpose of securing strength as the RFID label 40 and protecting the IC chip 6 . If the label substrate 41 is to be recycled together with an adherend such as a cardboard box, it is desirable to use a paper substrate. The adherend pressure-sensitive adhesive layer 42 may be selected according to the adherend. Alternatively, the adhesive layer 42 for the adherend may be formed by laminating a double-sided tape. In the RFID label 40 having this cross-sectional structure, the base film 2 also serves as the label substrate.

FIG. 6 is a cross-sectional view of an RFID label 50 according to another embodiment of the invention. The RFID label 30 shown in FIG. A label 43 (protective label) composed of a label substrate (protective substrate) 41 and an adherend adhesive layer 42 is laminated on the adhesive layer 21 side (see FIG. 5). The surface of the label base material 31 becomes the printing surface 51 .

FIG. 7 is a cross-sectional view of an RFID label 60 according to another embodiment of the invention. The RFID label 60 shown in FIG. 3 has the RFID inlay 10 of the RFID label 20 shown in FIG. A separator 22 is temporarily attached to the adherend adhesive layer 21 . A general-purpose adhesive can be used for the adherend adhesive layer 21 . Alternatively, the adhesive layer 21 for the adherend may be formed by laminating a double-sided tape. The RFID label 20 having this cross-sectional structure has a simple structure in which the base film 2 also serves as the label substrate. Therefore, the IC chip 6 is exposed, and it is suitable for applications where external force is not applied, such as inside a device.

FIG. 8 is a cross-sectional view of an RFID label 70 according to another embodiment of the invention. The RFID label 70 shown in FIG. 7 is obtained by laminating a laminate label 73 composed of a label substrate 71 and an adhesive layer 72 for lamination on the IC chip 6 side of the base film 2 of the RFID label 60 shown in FIG. The surface of the laminate label 73 serves as a printing surface 74 for printing information such as a bar code with a label printer. The label base material 71 is appropriately selected according to the use of the RFID label 30. If it is assumed that the label base material 71 is recycled together with an adherend such as a cardboard box, it is desirable to use a paper base material.

FIG. 9 is a cross-sectional view of an RFID label 80 according to another embodiment of the invention. The RFID label 80 shown in FIG. 7 is obtained by laminating a label 83 composed of a label substrate 81 and an adherend adhesive layer 82 on the adherend adhesive layer 21 side of the RFID label 60 shown in FIG. . The label base material 81 is laminated for the purpose of securing strength as the RFID label 80 and protecting the IC chip 6 . If it is assumed that the label base material 81 is recycled together with an adherend such as a cardboard box, it is desirable to use a paper base material. The adherend pressure-sensitive adhesive layer 82 may be selected according to the adherend. Alternatively, the adhesive layer 82 for the adherend may be formed by laminating a double-sided tape. In the RFID label 80 having this cross-sectional structure, the base film 2 also serves as the label substrate.

FIG. 10 is a cross-sectional view of an RFID label 90 according to another embodiment of the invention. The RFID label 90 shown in FIG. A label 43 composed of a label substrate 41 and an adherend adhesive layer 42 is laminated on the adherend adhesive layer 21 side (see FIG. 9).

[Modification]
FIG. 11 shows a modification of the invention.
FIG. 11 shows an RFID recording medium 100 in which a base material made of paper is laminated using an adhesive on both sides of an RFID inlay. In the figure, a paper substrate 101 is laminated on the IC chip 6 side of the RFID inlay 10 with an adhesive layer 102, and a paper substrate 111 is laminated on the base film 2 side of the RFID inlay 10 with an adhesive layer 112. is. This recording medium can be used, for example, as apparel tags (price tags), tickets, wristbands, and luggage tags. The paper base material 101 and the paper base material 111 may be selectively used depending on the product (application). For example, in the case of tags for apparel, a paper substrate having a thickness of 100 μm or more is used. In this case, the total thickness is close to 300 μm, giving a heavy feel to the touch. On the other hand, for ticket applications, a paper substrate having a thickness of 50 to 100 μm is used. This enables printing with a general-purpose label printer.

The apparel tags (price tags), tickets, wristbands, and luggage tags described above are incinerated or landfilled as garbage after completing their respective roles. When incinerated, the heat of combustion is smaller than that of conventional inlay PET films, which contributes to the prevention of global warming and the extension of the life of incinerators. In addition, when it is landfilled, it is biodegradable in the natural world because it is a plant-derived material.

1 RFID antenna 2 base film 3 metal foil (antenna pattern)
4 antenna pattern 5 adhesive layer for antenna bonding 6 IC chip 10 RFID inlay 11 loop part 12 IC chip connection part 13, 14 meander 15, 16 capacitor hat 20, 30, 40, 50, 60, 70, 80, 90 RFID label 21 adhesive layer 22 separators 31, 41, 71, 81, 101, 111 substrates 34, 74 printed surface 100 RFID recording medium

Claims (12)

1. An RFID antenna having an antenna made of a conductor formed on one surface of an inlay base material, wherein the inlay base material contains cellophane. The RFID antenna of Claim 1, wherein said conductor is a metal foil. 3. The RFID antenna according to claim 1 or 2, wherein the cellophane is moisture-proof cellophane. An RFID inlay in which an antenna made of a conductor is formed on one surface of an inlay base material and an IC chip is mounted on the antenna of the RFID antenna, wherein the inlay base material contains cellophane. 5. The RFID inlay of Claim 4, wherein the conductor is a metal foil. 6. The RFID inlay according to claim 4 or 5, wherein said cellophane is moisture-proof cellophane. An RFID label in which an RFID inlay in which an antenna made of a conductor is formed on one surface of an inlay base material and an IC chip is mounted on the antenna of the RFID antenna and an adhesive layer for an adherend are laminated, , an RFID label wherein said inlay substrate comprises cellophane. 8. The RFID label according to claim 7, wherein a laminate label comprising a label substrate and an adhesive layer for lamination is laminated on the RFID inlay side of the RFID label. 9. The RFID label according to claim 7, wherein a protective label comprising a protective substrate and an adherend adhesive layer is laminated on the adherend adhesive layer side of said RFID label. A laminate label consisting of a label substrate and an adhesive layer for lamination is laminated on the RFID inlay side of the RFID label, and a protective substrate and an adhesive layer for an adherend are laminated on the adhesive layer side for an adherend. 10. The RFID label according to any one of claims 7 to 9, wherein the protective label is laminated. The RFID label according to any one of claims 7-10, wherein said conductor is a metal foil. The RFID label according to any one of claims 7 to 11, wherein the inlay substrate cellophane is moisture-proof cellophane.

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