KR20200056179A - Rfid tag label and thereof manufacturing method - Google Patents

Abstract

Provided are an RFID tag label attached to a target object made of a metal material and a manufacturing method thereof. Metal flakes are formed with respect to alloy powder through a plate forming process. The mixture is formed by dispersing the metal flakes in a polymer resin. A non-magnetic polymer sheet is formed by allowing the mixture to be sheeted through a tape casting process. The non-magnetic polymer sheet is labeled on a polymer substrate on which an antenna pattern is formed through a roll-to-roll process.

Description

RFID tag label and its manufacturing method {RFID TAG LABEL AND THEREOF MANUFACTURING METHOD}

Embodiments of the present invention relate to an RFID tag label and a method of manufacturing the same. More specifically, the present invention relates to an RFID tag label including a polymer sheet and a manufacturing method thereof through a roll-to-roll process.

Recently, various functions such as near field communication (hereinafter referred to as “NFC”) using RFID (Radio Frequency Identification) have been added to portable terminals such as mobile phones and tablet PCs.

In particular, as a non-contact short-range wireless communication module using the NFC 13.56MHz frequency band, it refers to a technology for transmitting data between terminals at a close distance of 10cm. Here, NFC is widely used not only for mobile payments, but also for file transfers in supermarkets and general shops to transmit product information or travel information for visitors, transportation, and access control locks.

Meanwhile, since the wireless environment of RFID is widely used in portable terminals, for example, an NFC chip that realizes NFC is mounted, or a contactless smart card such as a USIM (Universal Subscriber Identification Module) card is mounted. In this case, when the external RF reader approaches the portable terminal, the RF reader reads the information on the USIM card of the portable terminal device and records necessary information by short-range wireless communication. (Eg, electronic money function) is realized.

At this time, the exchange of information between the NFC chip and the RF reader is performed by the induction electromotive force at 13.56 MHz between the primary coil (antenna) installed in the RF reader and the secondary coil (antenna) of the NFC chip installed in the mobile terminal. This is achieved by supplying power for driving.

That is, in order to apply the RFID system (NFC) to the portable terminal, a loop antenna in the form of a helical coil capable of generating induced electromotive force is required. The loop antenna for NFC is mainly installed on the battery cover. In this case, the induced electromotive force induced by the spiral coil-type loop antenna is determined by Faraday's law and Lenz's law. Therefore, in order to obtain a high voltage signal, the secondary coil (loop antenna coil) is interlinked. The more the amount of magnetic flux, the more advantageous. The amount of magnetic flux increases as the amount of soft magnetic material contained in the secondary coil increases, and as the permeability of the material increases.

In addition, a magnetic field of 100 kHz to several tens of MHz is generated in the antenna coil provided in the portable terminal when performing a near field communication (NFC) function with an adjacent terminal. In particular, when the roof antenna is attached to a skin complex made of a metallic material, due to RFID communication characteristics, radio wave distortion and poor communication due to diffuse reflection may occur.

Therefore, a ferrite sheet for magnetic field shielding is essential for the antenna coil provided in the portable terminal to prevent heat generation due to eddy current generated in the skin complex and to maximize the performance of additional functions by focusing the magnetic field. .

However, the ferrite sheet mainly uses an iron oxide-based magnetic material, which makes it difficult to manufacture an RFID tag label through a roll-to-roll process. This is because it is difficult to roll the ferrite sheet in a roll-to-roll process. Further, when the ferrite sheet is rolled, the surface is broken, and the RFID characteristics change as the permeability of the ferrite sheet changes.

As a result, as the roll-to-roll process using a ferrite sheet becomes difficult, manual work must be performed to attach the adhesive film to the ferrite sheet.

An object of the present invention is to provide an RFID tag label and a method of manufacturing the same, which can attach a polymer sheet for magnetic field shielding to a tag sheet through a roll-to-roll process.

Disclosed is an RFID tag label and a method of manufacturing the same according to an embodiment of the present invention for achieving the above object. In an RFID tag label attached to an object made of a metal material and a manufacturing method thereof, metal flakes are formed through a plate-making process for an alloy powder. The metal flakes are dispersed in a polymer resin to form a mixture. The mixture is sheeted through a tape casting process to form a nonmagnetic polymer sheet. The non-magnetic polymer sheet is labeled on a polymer substrate on which an antenna pattern is formed through a roll-to-roll process.

In one embodiment of the present invention, the non-magnetic polymer sheet may be formed to have a permeability in the range of 100 to 200 μ ₀ .

In one embodiment of the present invention, the non-magnetic polymer sheet may be formed to have a thickness of 0.3 to 0.7 mm.

In one embodiment of the present invention, the alloy powder may include FeCrSiAl-based alloy, FeSi alloy, stainless magnetic steel, FeCuNbSiB-based alloy, FeSiAl-based alloy, or a mixture of at least two of them.

In one embodiment of the present invention, the antenna pattern may be provided on one side of the polymer substrate, and the non-magnetic polymer sheet may be provided on the other side of the polymer substrate.

In one embodiment of the present invention, in the roll roll process, an adhesive tape may be interposed between the non-magnetic polymer sheet and the polymer substrate.

In one embodiment of the present invention, the roll roll process may additionally include a release paper to cover the polymer substrate on which the antenna pattern is formed.

According to the embodiments of the present invention as described above, the polymer substrate and the polymer sheet can be mutually compressed by being pressed through a roll-to-roll process. Accordingly, the RFID tag label including the polymer substrate and the polymer sheet is manufactured through an automated process, thereby improving productivity and reducing manufacturing cost.

Meanwhile, the non-magnetic polymer sheet may be formed to have a thickness of 0.3 to 0.7 mm. The gap between the metal flakes contained in the non-magnetic polymer sheet is uniform and the agglomeration between the metal flakes is suppressed, while the thickness variation of the non-magnetic polymer sheet is reduced, so that the problem of performance variation of the RFID tag label is solved. The problem of excessive increase in loss can be suppressed.

1 is a flowchart illustrating a method of manufacturing an RFID tag label according to an embodiment of the present invention.
2 is a cross-sectional view illustrating an RFID tag label according to an embodiment of the present invention.
3 is a cross-sectional view for explaining the nonmagnetic polymer sheet of FIG. 2.
4A and 4B are electron micrographs showing metals before the planarization process (FIG. 4A) and after the planarization process (FIG. 4B).
5A and 5B are electron micrographs showing non-magnetic polymer sheets 0.2 mm (FIG. 5A) and 0.6 mm (FIG. 5B) thick.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention should not be configured as limited to the embodiments described below, but may be embodied in various other forms. The following examples are provided to sufficiently convey the scope of the present invention to those skilled in the art of the present invention rather than to provide the present invention to be completely completed.

In the embodiments of the present invention, when one element is described as being disposed on or connected to another element, the element may be disposed or connected directly on the other element, and other elements are interposed between them. It may be. Alternatively, if it is described that one element is disposed or connected directly on the other element, there cannot be another element between them. Terms such as first, second, third, etc. may be used to describe various items such as various elements, compositions, regions, layers and / or parts, but the items are not limited by these terms. Would not.

The terminology used in the embodiments of the present invention is used for the purpose of describing specific embodiments only, and is not intended to limit the present invention. In addition, unless otherwise limited, all terms including technical and scientific terms have the same meaning that can be understood by those of ordinary skill in the art. These terms, such as those defined in conventional dictionaries, will be construed to have meanings consistent with their meanings in the context of the description of the invention and the related art, ideally or excessively intuition, unless explicitly defined. It will not be interpreted.

Embodiments of the present invention are described with reference to schematic illustrations of ideal embodiments of the present invention. Accordingly, variations from the shapes of the illustrations, for example, variations in manufacturing methods and / or tolerances, are those that can be expected sufficiently. Accordingly, the embodiments of the present invention are not limited to specific shapes of regions described as illustrations, but include variations in shapes, and the elements described in the figures are entirely schematic and their shapes Is not intended to describe the exact shape of the elements nor is it intended to limit the scope of the invention.

1 is a flowchart illustrating a method of manufacturing an RFID tag label according to an embodiment of the present invention. 2 is a cross-sectional view illustrating an RFID tag label according to an embodiment of the present invention. 3 is a cross-sectional view illustrating a non-magnetic polymer sheet in the RFID tag label of FIG. 2.

Referring to FIG. 1, according to a method of manufacturing an RFID tag label according to an embodiment of the present invention, first, metal flakes are formed through a plate-making process for an alloy powder (S110).

The alloy powder is a soft magnetic alloy powder, and may be a kind of sendust. The components constituting the alloy powder may include FeCrSiAl-based alloy, FeSi alloy, stainless magnetic steel, FeCuNbSiB-based alloy, FeSiAl-based alloy, or a mixture of at least two of them.

An example of the plate forming process is a milling process. That is, according to the milling process, the raw material alloy powder can be processed into a metal flake using an attrition milling machine. At this time, by adjusting the processing time of the attrition milling machine, it is possible to control the degree of flake plate formation.

The attrition milling machine is a device that crushes a workpiece by high-speed abrasion action of a microbead by an impeller rotating at a high speed. When a soft magnetic metal powder is put together with a zirconia ball (or a suspension ball), it is processed into a plate shape. Metal flakes can be obtained.

At this time, in this process, the rotational processing speed of the attrition milling machine is made at 450 to 550 rpm, and can be performed for a relatively short period of 2 to 5 hours in the processing time. Accordingly, the metal flakes having a relatively high aspect ratio are formed through a processing operation at a high speed and in a short period of time, thereby obtaining an effect of reducing manufacturing time and cost.

Subsequently, the metal flakes are dispersed in a polymer resin to form a mixture (S130). In order to form the mixture, a kneader can be used.

Polyurethane resin may be used as the polymer resin. The polyurethane resin allows the non-magnetic polymer sheet to be subsequently formed to have excellent electrical insulation and elasticity. Accordingly, the RFID tag label including the polymer sheet can have excellent electrical and mechanical properties.

Meanwhile, a small amount of a platinum-based compound may be added to the mixture to add flame retardancy and used.

Thereafter, the non-magnetic polymer sheet is formed through the tape casting process (S150). By forming the non-magnetic polymer sheet 150 through the tape casting process, the thickness of the non-magnetic polymer sheet 150 can be uniformly adjusted. That is, the non-magnetic polymer sheet 150 may have a difference in frequency characteristics and recognition distance of the RFID tag 100 depending on the thickness, but may be formed through a tape casting process, and thus may have a uniform thickness. The frequency characteristic and the recognition distance of 100) may be uniform.

The non-magnetic polymer sheet 150 may be formed to have a thickness of 0.3 to 0.7 mm. When the non-magnetic polymer sheet 150 has a thickness of less than 0.3 mm, aggregation between metal flakes may occur as the gaps between the metal flakes are non-uniform and too small. Furthermore, the RFID tag label 100 of the non-magnetic polymer sheet 150 having a thickness of less than 0.3 mm may have a problem of performance variation due to thickness variation and aggregation between plates. On the other hand, when the non-magnetic polymer sheet 150 has a thickness of more than 0.7 mm, the size of the imaginary part of a plurality of dielectric constants increases as the distribution structure of the flakes changes. Therefore, the RFID tag label 100 having a non-magnetic polymer sheet 150 having a thickness of more than 0.7 mm may increase power loss excessively.

The non-magnetic polymer sheet 150 may be adjusted to have a permeability in the range of 100 to 200 μ ₀ . When the non-magnetic polymer sheet 150 has a magnetic permeability of more than 200 μ ₀ , there may be a problem in that the characteristics of the RFID tag label 100 are greatly changed according to a temperature change and a material forming a skin complex. On the other hand, if the non-magnetic polymer sheet 150 has a permeability of less than 100 μ ₀ , there is a problem that the RFID tag must be formed too large. Referring to FIG. 3, the non-magnetic polymer according to an embodiment of the present invention The sheet 150 may have a multilayer structure. In this case, the non-magnetic polymer sheet 150 may include a first non-magnetic polymer sheet 151 and a second non-magnetic polymer sheet 152. Each of the first non-magnetic polymer sheet 151 and the second non-magnetic polymer sheet 152 may include polymer resins 151a and 152a and metal flakes 151b and 152b dispersed in the polymer resin.

Thereafter, the non-magnetic polymer sheet 150 is labeled on the polymer substrate 110 on which the antenna pattern 130 is formed through a roll-to-roll process (S170).

The antenna pattern 130 is formed on one surface of the polymer substrate 110. The antenna pattern 130 may have a meander shape to secure a recognition distance. In addition, the antenna pattern 130 is electrically connected to a chip mounted on one surface of the polymer substrate 110.

The polymer substrate 110 may be made of, for example, polyimide, polypropene or polyethylene terephthalate (PET).

In the roll-to-roll process, roll-to-roll equipment including a press unit, a winding roller, and the like may be used. The polymer substrate 110 and the non-magnetic polymer sheet 150 are drawn into the roll-to-roll equipment, and can be compressed together by pressing the polymer substrate 110 and the non-magnetic polymer sheet 150.

As a result, in manufacturing the RFID tag label 100 including the polymer substrate 110 and the non-magnetic polymer sheet 150, productivity may be improved and manufacturing costs may be reduced through an automated process.

In the roll roll process according to an embodiment of the present invention, an adhesive tape 140 may be further interposed between the non-magnetic polymer sheet 150 and the polymer substrate 110. Thus, the non-magnetic polymer sheet 150 and the polymer substrate 110 can be more firmly pressed.

The RFID tag label 100 formed as described above may have an antenna pattern 130 on the front side facing the reader antenna and a non-magnetic polymer sheet 150 on the back side. The RFID tag label 100 has a self-resonant frequency (SRF) of the antenna pattern 130 by a non-magnetic polymer sheet 150 including a metal flake even when a metal material is close to the rear surface. It can prevent changes or communication failures.

Accordingly, even if the RFID tag label 100 including the non-magnetic polymer sheet 150 is mounted on an object including metal, communication with the reader antenna may be possible.

According to the roll roll process according to an embodiment of the present invention, a release paper (not shown) may be additionally provided to cover the polymer substrate on which the antenna pattern is formed. The release paper may be formed of a PET material. The release paper may suppress deformation of the non-magnetic polymer sheet 150 and the polymer substrate 110 during the roll-to-roll process.

4A and 4B are electron micrographs showing metals before the planarization process (FIG. 4A) and after the planarization process (FIG. 4B).

4A and 4B, it can be confirmed that the alloy powder is converted into a flake shape through a flattening process such as the milling process.

5A and 5B are electron micrographs when the thickness of the non-magnetic polymer sheet is 0.2 mm and 0.6 mm.

5A and 5B, it can be seen that the 0.2 mm thick non-magnetic polymer sheet (see FIG. 5A) has a non-uniform spacing between metal flakes, and aggregation occurs in a specific region.

On the other hand, it can be seen that the non-magnetic polymer sheet having a thickness of 0.6 mm (see FIG. 5B) has a uniform spacing between metal flakes and no agglomeration.

Although described above with reference to preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand that there is.

100: RFID tag label 110: polymer substrate
140: adhesive tape 130: antenna pattern
150: non-magnetic polymer sheet 151: first non-magnetic polymer sheet
152: second non-magnetic polymer sheet

Claims (8)

In the method of manufacturing an RFID tag label attached to an object made of a metal material,
Forming metal flakes on the alloy powder through a plate forming process;
Dispersing the metal flakes in a polymer resin to form a mixture;
Forming the non-magnetic polymer sheet by sheeting the mixture through a tape casting process;
A method of manufacturing an RFID tag label comprising the step of labeling the non-magnetic polymer sheet on a polymer substrate having an antenna pattern through a roll-to-roll process. The method of claim 1, wherein the non-magnetic polymer sheet is formed to have a permeability in the range of 100 to 200 μ ₀ . The method of claim 1, wherein the non-magnetic polymer sheet is formed to have a thickness of 0.3 to 0.7 mm. The method of claim 1, wherein the alloy powder comprises FeCrSiAl-based alloy, FeSi alloy, stainless magnetic steel, FeCuNbSiB-based alloy, FeSiAl-based alloy, or a mixture of at least two of them. The method of claim 1, wherein the antenna pattern is provided on one surface of the polymer substrate, and the non-magnetic polymer sheet is provided on the other surface of the polymer substrate. The method of claim 1, wherein the step of performing the roll roll process comprises interposing an adhesive tape between the non-magnetic polymer sheet and the polymer substrate. The method of claim 1, wherein the step of performing the roll-to-roll process further comprises the step of additionally providing a release paper to cover the polymer substrate on which the antenna pattern is formed. The RFID tag label manufactured by the manufacturing method of the RFID tag label of any one of Claims 1-7.

Images