JP2018151511A - Rfid label and pasted body of rfid label - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an RFID label that breaks an antenna function by removal having an antenna conductor pattern layer formed on a front/back face of an antenna base material, the RFID label capable of being manufactured with a manufacturing process having no alignment means.SOLUTION: An RFID label 20 includes: at least on one face of an antenna base material 1, a removal coat layer 2, an adhesive layer 3, an antenna conductor pattern layer A5, and an adhesive material layer 6 for an adherend; and on the other face thereof, an adhesive layer and an antenna conductor pattern layer B4. In the RFID label, an antenna conductor pattern layer A and an antenna conductor pattern layer B have an antenna configuration that can exhibit an antenna function when all conduction parts 10 are connected.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an RFID label for detecting tampering and a sticker to which the RFID label is attached.

  Conventionally, a seal label or the like has been used to detect unauthorized opening of a high-class whiskey or an expensive article. However, with a paper-based sealed label, it is not possible to detect 100% unauthorized opening because it can be successfully opened without damaging the sealed label, the contents can be replaced, and then sealed again using the same label. . Further, when the seal label is peeled off, even if there is some damage, there is a possibility that it is difficult to detect unauthorized opening as long as it cannot be visually recognized.

  Therefore, as a technology that can detect that the package has been reliably opened, the RFID label that has been affixed once is peeled off from the adherend, and it is used for the purpose of preventing unauthorized use such as reattaching to another adherend. A configuration that destroys the RFID function at the time of peeling is considered.

  For example, Patent Document 1 discloses an RFID label in which a conductor foil is pasted on an antenna substrate such as a PET film, an antenna pattern is formed by etching, an IC chip is mounted, and then an adhesive material is stacked. A technology that makes the antenna pattern easily breakable at the time of re-peeling by providing a part of the adhesive strength of the antenna pattern to the antenna base by providing a release coat layer between the antenna base and the conductor foil. Is disclosed.

  This technique is a technique with a high level of detecting tampering, but a release coat layer must be arranged in accordance with the antenna shape.

  Usually, when an antenna pattern is formed by etching, a conductive foil is bonded on an antenna substrate such as a PET film in a roll state, and then antenna formation by etching is also performed in a roll state. It is not necessary to align the substrate and the antenna pattern. However, in the technique disclosed in Patent Document 1, since the alignment of the release coat layer and the antenna pattern is required, equipment for alignment is necessary, which hinders cost reduction.

JP 2001-39068 A

  In view of the above circumstances, the present invention can manufacture an RFID label that destroys an antenna function by peeling with an antenna conductor pattern layer formed on the front and back surfaces of an antenna substrate in a manufacturing process that does not include an alignment means. It is an object to provide a simple RFID label.

As means for solving the above-mentioned problems, the invention according to claim 1 of the present invention is characterized in that at least one surface of the antenna substrate is provided with a release coat layer, an adhesive layer, an antenna conductor pattern layer A, and an adhesion. An adhesive layer for adherend that adheres to the body, and an adhesive layer and an antenna conductor pattern layer B on the other surface, and an antenna conductor pattern A and an antenna conductor pattern In the RFID label in which B is electrically connected by a plurality of conductive parts,
The antenna conductor pattern layer A and the antenna conductor pattern layer B have an antenna configuration that exhibits an antenna function when all of the plurality of conductive portions are connected,
The RFID label is characterized in that the adhesive strength between the release coat layer and the adhesive layer is smaller than the adhesive strength between the adherend and the adherent adhesive layer.

Further, the invention described in claim 2 is an adherend adhesive material for adhering a peel coat layer, an adhesive layer, a conductor pattern A, and an adherend to at least one surface of an antenna substrate. And the other surface is provided with an adhesive layer, an antenna conductor pattern C, an insulating layer, and an antenna conductor pattern D. The antenna conductor pattern C and the antenna conductor pattern D are In the RFID label that is conductive in the through-hole provided in a part of the insulating layer, and the antenna conductor pattern C and the conductor pattern A are electrically connected by a plurality of conductive portions,
The adhesive strength between the release coat layer and the adhesive layer is smaller than the adhesive strength between the adherend and the adherent adhesive layer,
An RFID that is characterized in that it detects that the RFID label has been peeled off by disconnecting any of the conductive portions that electrically connect the antenna conductor pattern C and the conductor pattern A, but retains the antenna function. It is a label.

The invention according to claim 3 is the sticker of the RFID label according to claim 1 or 2,
The RFID label sticking body is characterized in that at least one of the conducting parts of the RFID label is disposed across the opening of the sticking object.

  According to the RFID label of the first aspect of the present invention, the RFID label includes a plurality of conductive portions that conduct the antenna conductor pattern layer formed on the front and back surfaces of the antenna base, and any one of the conductive portions is provided. Since the antenna function is destroyed by disconnection when peeling from the adherend to which the RFID label is attached, an RFID label capable of detecting unauthorized opening can be provided.

  Moreover, according to the RFID label of the second aspect of the present invention, the antenna function is expressed by the two-layer antenna conductor pattern formed by sandwiching the insulating layer on the label exterior material side, and is formed on the adherend side. Any one of the plurality of conductive portions that electrically connect the conductor pattern and the antenna conductor pattern is disconnected when the conductor pattern is peeled off from the adherend to which the RFID label is attached. Sustainable RFID labels can be provided.

  The RFID label of the present invention can be manufactured by a manufacturing process that does not require alignment.

  Moreover, it can be set as the sticking body of the RFID label which can detect unauthorized opening by arrange | positioning and sticking the several conduction | electrical_connection part of the RFID label of this invention ranging over the opening part of a to-be-pasted body.

Sectional drawing which shows an example of the RFID label which has an antenna destruction function of this invention. Sectional drawing which illustrates the state which the conduction | electrical_connection part of the RFID label of FIG. 1 peeled with the adhesive bond layer 3 and antenna conductor pattern layer A5. The top view which shows an example of the RFID label which has an antenna destruction function of this invention. The bird's-eye view which shows an example of the sticking body of the RFID label which can detect the unauthorized opening of this invention. Sectional drawing which shows an example of the RFID label which has an antenna destruction function of this invention. Sectional drawing which illustrates the state which the conduction | electrical_connection part of the RFID label of FIG. 5 peeled in the interface of the adhesive bond layer 3 and antenna conductor pattern A5-1.

<RFID label>
(First embodiment)
An RFID label according to a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view illustrating the layer configuration of an RFID label 20 of the present invention.

  The RFID label 20 of the present invention includes a release coat layer 2, an adhesive layer 3, an antenna conductor pattern layer A5, and an adherend adhesive layer 6 on at least one surface of the antenna substrate 1. The other side is an RFID label provided with an adhesive layer 3 and an antenna conductor pattern layer B4.

The antenna conductor pattern layer A5 and the antenna conductor pattern layer B4 are electrically connected by a plurality of conducting portions 10 so as to exhibit an antenna function.
It is a feature that the antenna function can be exhibited when all of the plurality of conducting portions 10 are connected.
FIG. 1 further shows an example in which an adhesive layer 7, a label exterior material adhesive layer 8, and a label exterior material 9 are provided on the antenna conductor pattern layer B4.

  FIG. 2 exemplifies a cross-sectional state of the RFID label 20 in which peeling occurs between the peeling coat layer 2 and the adhesive layer 3 when the RFID label 20 of FIG. is there. By separating in this way, the conductive portion 10 is separated from the conductor pattern A5, and the conductor pattern A5 and the conductor pattern B4 are electrically disconnected, so that the function as an antenna is destroyed. This is because the conductor pattern A5 and the conductor pattern B4 are configured to function as one antenna by being conducted in all the conducting portions 10. Therefore, the antenna function is destroyed when any of the conducting portions 10 is not conducted.

FIG. 3 shows an example of a top view of the RFID label 20 of the present invention. The antenna conductor pattern layer B4 and the antenna conductor pattern layer A5 formed on the front and back surfaces of the antenna substrate 1 are electrically connected by the conductive portions 11 and 12 provided at two locations, and are electrically connected. In this state, an antenna is formed. Therefore, if either one of the conducting part 11 and the conducting part 12 is disconnected, the antenna does not function. In this example, there are two conducting parts, but it is not necessary to limit to two places, and two or more conducting parts are provided, and the antenna function is destroyed when one of them is disconnected. It only has to be done.
An IC chip 15 is connected to the antenna to form an inlet.

(Antenna substrate)
Antenna base material is polyethylene terephthalate (PET), polyethylene naphthalate

Plastic substrates such as (PEN), polycarbonate (PC), and polyimide (PI) can be used. Further, a paper base material or the like may be used.

(Adhesive layer and adhesive layer)
As an adhesive (adhesive) layer used for the adhesive layer 3, the adherent adhesive layer 6, the label exterior material adhesive (or adhesive) layer 7, etc., the adhesive strength (adhesive) having a width of 10 mm is used. A material having a 180 ° peel test value of 2N / 10 mm or more, preferably 3N / 10 mm or more when the layer is attached to a stainless steel plate can be used. This is a so-called medium-adhesive or strong-adhesive region. If it is within this range, it can be attached and held on the adherend, and the label itself is peeled off from the adherend 9 when the metal layer described later is peeled Can be prevented.

  Although it does not specifically limit as thickness of an adhesion | attachment (adhesion) layer, 0.1 micrometer-5 mm, Preferably it can provide in the range of 10-50 micrometers.

  As the adhesive (adhesive) layer, a solvent type, an aqueous emulsion type, a hot melt type, or the like can be used.

  The solvent type is mainly composed of natural rubber and synthetic rubber including block copolymer, rosin and its ester, tackifier resin such as terpene resin, softener such as phthalate ester and phosphate ester, toluene, N- Adhesion of rosin and its ester, terpene resin, etc. to acrylic resin mainly composed of polyacrylic acid ester obtained by radical polymerization in a solvent mainly composed of ethyl acetate or toluene. There are resins made of an imparting resin, a plasticizer such as a phthalate ester and a phosphate ester, and a curing agent such as a diisocyanate and an aziridinyl group compound.

  As an aqueous emulsion type, an acrylic resin mainly composed of polyacrylate obtained by emulsion polymerization in water is made into an emulsion composed of additives such as antifoaming agent, leveling agent, thickener netine dispersion, etc. There is.

  As the hot melt type (solvent-free type), there is one having an ethylene-vinyl acetate copolymer as a main component, and any of the above solvent type, aqueous emulsion type, and hot melt type (solvent-free type) can be used. Among them, the adhesive layer using the water-based emulsion type adhesive with acrylic resin as the main resin is more suitable in terms of flexibility between the rollers, and it can cope with environmental problems, safety and economy. It is a more advantageous pressure-sensitive adhesive from the viewpoint of the above.

  In addition, polyvinyl acetate, ethylene-vinyl acetate copolymer, polyacrylate ester, polyvinyl chloride, natural rubber, synthetic rubber, vinyl acetate-acrylate copolymer, polyester, polyurethane, etc. A water-insoluble polymer material can also be used. These materials can be set within the aforementioned adhesive strength range by optimization of additives, molecular weight, and the like.

As the adhesive (adhesive) layer, rubber-based, silicone-based, and urethane-based materials can be appropriately used.
Moreover, it is good also as a pseudo-adhesion layer using the pressure sensitive adhesive composition which added microparticles | fine-particles. Since the pressure-sensitive adhesive composition to which fine particles are added can be easily peeled off, it is advantageous for peeling off the metal layer.

  The adhesive base used in the pressure-sensitive adhesive composition to which fine particles are added is not particularly limited, and can be arbitrarily selected from those conventionally used for conventional pressure-sensitive adhesives such as natural rubber and synthetic rubber. In particular, natural rubber latex obtained by graft copolymerization of natural rubber with styrene and methyl methacrylate is suitable in terms of blocking resistance, heat resistance, wear resistance, and the like. .

  The fine particles used in the pressure-sensitive adhesive composition are not compatible with the pressure-sensitive adhesive base used, that is, a fine particle filler that is incompatible with the pressure-sensitive adhesive base. It is preferable. Examples of such a fine filler include zinc oxide, titanium oxide, calcium carbonate, kaolin, activated clay, spherical alumina, wheat starch, silica, glass powder, and shirasu balloon. These materials may be used alone or in combination of two or more, but a combination of silica and another filler is particularly suitable.

  As the adhesive (adhesive) agent layer, a release coat layer and an adhesive (adhesive) layer body can be used for easy peeling. Since the adhesive (adhesive) layer body has a release coat layer, it is not always necessary to use a weak adhesive material, and an adhesive (adhesive) material that can be easily peeled off can be used.

(Release coat layer)
The release coat layer 2 is not particularly limited as long as it can impart releasability. For example, the release coat layer 2 is composed of a silicone-based release agent to which medium is added, if necessary, an acrylic resin, a vinyl chloride resin, Urethane-based resins, chlorinated rubber-based resins, and the like can be used. If necessary, an additive composed of either a polyester-based resin or a vinyl chloride-based resin can be added.

(Antenna conductor pattern layers A and B)
The antenna conductor pattern layer A5 and the antenna conductor pattern layer B4 are not particularly limited as long as a circuit can be formed using a conductive material, and various types can be used. For example, a method of forming a metal layer in a pattern by etching, a method in which conductive ink is formed in a pattern by printing, and the like can be mentioned.

  As a method of forming a metal layer in a pattern by etching, a conductive thin film such as aluminum or copper is coated in a pattern with an etchant-resistant material, and the conductive thin film is partially removed with an etchant. A method of forming a conductive thin film in a pattern can be used. In addition, about the part where wiring intersects, you may connect by providing a jumper wire on the back of the inlet base material, providing an opening for connection on the inlet base material, or connecting by separately using a jumper wire member You may let them.

  As a method of forming the conductive ink in a pattern by printing, it is preferable that the conductive ink is made of a conductive paste in which particles made of a conductive material are dissolved or dispersed in a binder. The conductive material described above is preferably silver-based, and examples of the conductive paste include an evaporative drying type silver paste that contains a binder resin, a solvent, and silver powder to obtain conductivity by contacting them. However, the conductive material is not limited to silver, but for example, a metal powder such as copper or nickel, a conductive carbon powder, a conductive fiber, a conductive whisker or the like dissolved or dispersed in a solvent together with a resin binder is used. it can. As a printing method, for example, it can be formed by printing by a printing method such as screen printing, flexographic printing, gravure printing, or offset printing. It is also possible to print conductive ink with a printer.

(Label exterior material adhesive layer)
As the label exterior material adhesive layer, the same material as the above-mentioned adhesive (adhesive) layer may be used.

(Label packaging material)
Although it does not specifically limit as a label exterior material, For example, what printed the pattern and the character on the resin film can be used.

(Second Embodiment)
An RFID label according to a second embodiment of the present invention will be described with reference to the drawings.
FIG. 5 is a cross-sectional view illustrating the layer configuration of the RFID label 30 of the present invention.
The RFID label 30 of the present invention is attached to at least one surface of the antenna substrate 1 for bonding the release coat layer 2, the adhesive layer 3, the antenna conductor pattern A 5-1, and the adherend 9. An adhesive layer, an antenna conductor pattern C4-2, an insulating layer 11, and an antenna conductor pattern D4-1 on the other surface. The conductor pattern C4-2 and the antenna conductor pattern D4-1 are electrically connected through a through hole provided in a part of the insulating layer 11, and the antenna conductor pattern C4-2 and the conductor pattern A5-1 include a plurality of conductor patterns C4-2. It is an RFID label 30 that is electrically connected by a conduction part 10.

  In the RFID label 30, the adhesive strength between the release coat layer 2 and the adhesive layer 3 is smaller than the adhesive strength between the adherend 9 and the adherent adhesive layer 6, and the antenna conductor pattern C4-2 An RFID that is characterized in that it detects that the RFID label 30 has been peeled off by disconnection of any of the conducting portions 10 that electrically connect the antenna conductor pattern A5-1, but retains the antenna function. It is a label.

<Attached body of RFID label>
FIG. 4 shows a state in which the RFID label 20 of the present invention is affixed to the unsealed portion 13 of the adherend, and illustrates the RFID label affixed body 14 capable of detecting unauthorized opening of the present invention.

  In the RFID label sticking body 14 of the present invention, at least one conductive portion of the RFID label 20 of the present invention is disposed across the unsealing portion 13 of the adherend.

  The RFID having an antenna destruction function when the unsealed portion 13 of the adherend is opened by providing at least one conductive portion 11 and 12 across the unsealed portion 13 of the adherend as described above. Since either the conducting portion 11 or the conducting portion 12 of the label 20 must be peeled off, the RFID label sticking body 14 capable of detecting unauthorized opening can be obtained.

<Method of manufacturing RFID label having antenna destruction function>
Next, the manufacturing method of the RFID label of this invention is demonstrated.
The RFID label of the present invention can be manufactured using a conventional RFID label manufacturing method.

  For example, a step of forming a release coat layer that can weaken the adhesive strength with the adhesive layer on one surface of the antenna substrate, and then laminating a copper foil on the front and back surfaces of the antenna substrate via the adhesive layer A step of forming an antenna pattern by patterning the copper foil on the front and back surfaces, and then a plurality of through holes for connecting the antenna patterns formed on the front and back surfaces to a plurality of locations of the antenna pattern A step of forming in a place, a step of performing electrical connection by forming a conductor in the through hole, and a step of forming a pressure-sensitive adhesive layer for adhering to an adherend on one surface The RFID label of the present invention can be manufactured by performing the step of adhering the label outer packaging material via the adhesive layer for adhering the label outer packaging material to the other surface. Here, in the step of forming the through-holes at a plurality of locations, the positions where the through-holes are formed are the positions that function as one antenna by connecting the antenna patterns formed on the front and back surfaces. Can be provided with an antenna destruction function. The position where the through hole is formed can be, for example, a position where the antennas are connected in series.

  Further, since the release coat layer is applied over the entire RFID label, it is not necessary to align the antenna pattern and the release coat layer. Also, in the step of forming the antenna pattern by patterning the copper foils on the front and back surfaces, alignment is not required by using a pair of front and back photomasks that are aligned in advance.

(Step of forming a release coat layer)
A coating solution for forming a release coating layer is applied to one surface of an antenna substrate such as a PET film wound in a roll shape by a roll-to-roll type coating apparatus, and the release coating layer is formed by drying. A process can be performed.

(The process of laminating copper foil through the adhesive layer)
Next, a copper foil is laminated and bonded to both surfaces of an article having a release coat layer formed on one surface of the antenna substrate. This step may be any step as long as the copper foil can be laminated via the adhesive layer. For example, the adhesive layer is applied to both sides of the article in which the release coating layer is formed on one side of the antenna substrate, or the copper foil. The process of laminating copper foil through an adhesive bond layer can be implemented by apply | coating an adhesive bond layer to the adhesive surface side and sandwiching with copper foil.

(Process for forming antenna pattern)
Next, in the process of forming the antenna pattern, the copper foil bonded in the above process can be patterned using a photolithography process to form the antenna pattern. Aluminum foil may be used instead of copper foil. As an etching mask used in the photolithography process, a liquid photosensitive resist may be applied and dried, or a photosensitive dry film may be laminated. Conventional photolithography processes, including others, can be suitably used.

(Process of forming through holes at multiple locations)
As described above, after the antenna pattern is formed on both surfaces of the article having the release coat layer formed on one surface of the antenna substrate, through holes are formed at a plurality of locations. The positions where the through holes are formed are formed at a plurality of positions where the antenna patterns formed on the front and back surfaces are connected to enable the function as an antenna. For example, through holes are formed in at least two positions where antenna patterns formed on the front and back surfaces are connected in series. These through holes need to be in a positional relationship so that they can be arranged across the opening of the adherend. Any number of through-holes may be formed as long as they have a positional relationship that can be arranged across the opening of the adherend.

  The means for forming the through hole need not be particularly limited. Any means capable of forming a through hole in the antenna substrate may be used. Also, the through hole only needs to be able to conduct the antenna pattern formed on the front and back surfaces. The through hole may be formed inside the antenna pattern, or may protrude outside the antenna pattern. And what is necessary is just to be able to form a conductive material so that the antenna pattern formed in the front and back surfaces can be connected.

(Process to form a conductor in the through hole and make electrical connection)
As the conductive material, metal plating such as copper plating or conductive ink can be preferably used. Further, conduction may be obtained using caulking or rivets. In this case, the narrow side of caulking or rivets is arranged on the side where the release coat layer is formed to facilitate removal.

DESCRIPTION OF SYMBOLS 1 ... Antenna base material 2 ... Release coating layer 3 ... Adhesive layer 4 ... Antenna conductor pattern layer B
4-1 ... Antenna conductor pattern layer D
4-2 ... Antenna conductor pattern layer C
5, 5-1 ... Antenna conductor pattern layer A
6 ... Adhesive layer for adherend 7 ... Label exterior material adhesive layer 8 ... Label exterior material 9 ... Adhered part (part where the RFID label of the adherend is attached)
DESCRIPTION OF SYMBOLS 10, 11, 12 ... Conduction part 13 ... Opening part 14 of a to-be-adhered body ... RFID label attaching body 15 ... IC chip 20, 30 ... RFID label

Claims (3)

At least one surface of the antenna substrate is provided with a release coat layer, an adhesive layer, an antenna conductor pattern layer A, and an adherend adhesive layer for adhesion to the adherend, and the other In the RFID label, the surface includes an adhesive layer and an antenna conductor pattern layer B, and the antenna conductor pattern A and the antenna conductor pattern B are electrically connected by a plurality of conductive portions.
The antenna conductor pattern layer A and the antenna conductor pattern layer B have an antenna configuration that exhibits an antenna function when all of the plurality of conductive portions are connected,
An RFID label, wherein an adhesive strength between a release coat layer and an adhesive layer is smaller than an adhesive strength between an adherend and an adherent adhesive layer. At least one surface of the antenna substrate is provided with a release coat layer, an adhesive layer, a conductor pattern A, and an adherent adhesive layer for adhesion to the adherend, and on the other surface. Includes an adhesive layer, an antenna conductor pattern C, an insulating layer, and an antenna conductor pattern D. The antenna conductor pattern C and the antenna conductor pattern D pass through a part of the insulating layer. In the RFID label that is conductive in the hole, and the antenna conductor pattern C and the conductor pattern A are electrically connected by a plurality of conductive portions,
The adhesive strength between the release coat layer and the adhesive layer is smaller than the adhesive strength between the adherend and the adherent adhesive layer,
An RFID that is characterized in that it detects that the RFID label has been peeled off by disconnecting any of the conductive portions that electrically connect the antenna conductor pattern C and the conductor pattern A, but retains the antenna function. label. A sticker of the RFID label according to claim 1 or 2,
The RFID label sticking body, wherein the conductive portions of the RFID label are arranged at least one by one across the opening of the sticking body.