Radio frequency identification tag used for being embedded into tire and preparation method of radio frequency identification tag

Abstract

The present invention relates to a radio frequency identification tag to be embedded into a tire, and according to one embodiment of the present invention, the radio frequency identification tag to be embedded into a tire is technically characterized by comprising: a PCB substrate having a prescribed length; an antenna having a predetermined length, formed in a spiral shape, and fitted along the longitudinal direction of the PCB substrate; and a radio frequency identification (RFID) chip which is provided in the central portion of the PCB substrate and which wirelessly receives data from the antenna, the PCB substrate and the antenna being spaced apart from each other by a predetermined distance as the front / rear width of the interior of the antenna formed by the spiral shape is larger than the front / rear width of the PCB substrate, and the PCB substrate and the antenna forming a space portion, the space portion being spaced apart from each other by a predetermined distance. And a part of the antenna is arranged in the protective cover, so that the interval between the radio frequency identification chip and the antenna is kept constant.

Description

Technical Field

[0001] This invention relates to a radio frequency identification (RFID) tag for embedding in a tire, and more specifically, to a radio frequency identification (RFID) tag for embedding in a tire and a method for manufacturing the same, wherein rubber is inserted between an antenna and a substrate during the tire vulcanization process so that the RFID tag can be completely embedded inside the tire. Background Technology

[0002] Taking automobile tires as an example, in order to manage manufacturing, shipping and distribution, it is necessary to quickly understand the inherent information of each tire, such as type, manufacturing number, specifications, characteristics, processing history, usage history, etc.

[0003] In particular, product liability law stipulates that if a product defect causes harm to the life, body or property of others, the manufacturer is liable for compensation for the resulting losses regardless of whether the manufacturer was negligent. Therefore, manufacturers need to thoroughly manage each tire.

[0004] Therefore, tire manufacturers use radio frequency identification (RFID) tags affixed to tires to manage each tire, as these tags can remember product history and usage history.

[0005] Most existing RFID tags are helical in shape. Because these helical RFID tags are inserted into the tire with a helical structure and a hollow interior, the air inside the helical structure cannot be completely expelled. In other words, existing RFID tags are manufactured by inserting them into the tire with air inside the helical structure, and this is a defective factor.

[0006] For example, there is a risk of air bubbles forming inside the tire, which reduces the adhesion of the RFID tag and makes it easy to separate. In addition, during vehicle operation, the durability of tires with embedded RFID tags may be reduced due to continuous impacts from road conditions and vehicle conditions.

[0007] To address the aforementioned issues, radio frequency identification (RFID) tags with built-in antennas were developed. However, these RFID tags with built-in antennas simply attach the substrate directly to the tire, which can lead to insufficient durability due to damage to the substrate attached to the tire.

[0008] Furthermore, existing RFID tags have their chips and antennas physically connected directly. When used by pasting or embedding them inside tires, there is a problem that the physical connection between the chip and the antenna may break, causing the RFID tag to become unreadable.

[0009] To solve the above problems, it is necessary to study the preparation method of radio frequency identification tags.

[0010] Existing technical documents

[0011] Patent documents

[0012] Patent Document 1: Korean Patent No. 10-2332843 (November 25, 2021) Summary of the Invention

[0013] Technical issues

[0014] The problem to be solved by the present invention is to provide a wireless radio frequency identification tag for embedding in tires and a method for preparing the same. In the tire vulcanization process, rubber is inserted between the antenna and the substrate so that the radio frequency identification tag can be completely embedded in the tire. The radio frequency identification tag is wireless, thereby preventing the problem of failure to identify due to the physical connection between the chip and the antenna breaking in advance. Furthermore, the setting interval between the chip and the antenna is completely fixed, and a high recognition rate can be maintained while using wireless technology.

[0015] Technical solution

[0016] The present invention addresses the technical problem described above. One embodiment of the present invention features a wireless radio frequency identification (RFID) tag for embedding in a tire, comprising: a PCB (printed circuit board) substrate having a predetermined length; an antenna having a predetermined length, formed in a spiral shape, and fitted along the length direction of the PCB substrate; and an RFID chip disposed in the central portion of the PCB substrate, which wirelessly receives data from the antenna. The front / rear width of the interior formed by the spiral shape of the antenna is greater than the front / rear width of the PCB substrate, and a space is formed between the PCB substrate and the antenna by a predetermined distance.

[0017] Furthermore, in one embodiment of the present invention, an insertion hole can be formed on the left and right sides of the PCB substrate, respectively. One end of the antenna can be connected to the left insertion hole of the PCB substrate, and the other end of the antenna can be connected to the right insertion hole of the PCB substrate.

[0018] An embodiment of the present invention provides a radio frequency identification (RFID) tag for embedding in a tire that may further include a protective cover formed by molding on the PCB substrate to protect the RFID chip.

[0019] In a wireless radio frequency identification tag for embedding in a tire according to an embodiment of the present invention, at least one rubber inlet hole may be formed along the length direction of the PCB substrate.

[0020] The technical features of the method for preparing a wireless radio frequency identification tag for embedding in a tire according to an embodiment of the present invention are as follows: a step of preparing a PCB substrate with a radio frequency identification chip attached, wherein the radio frequency identification chip wirelessly receives data from an antenna; a step of preparing a metal antenna having a specified length and being formed in a spiral shape, wherein the front / back width of the interior formed by the spiral shape is greater than the front / back width of the PCB substrate; and a step of inserting the antenna into the end of the PCB substrate for fitting.

[0021] Furthermore, a method for preparing a radio frequency identification tag for embedding in a tire according to an embodiment of the present invention may include the following steps: molding a protective cover onto a PCB substrate incorporating the antenna; applying a primer to the PCB substrate; and applying a rubber solution to the PCB substrate.

[0022] The method for preparing a radio frequency identification tag for embedding in a tire according to an embodiment of the present invention may further include the following steps: forming at least one rubber inlet hole along the length direction of the PCB substrate.

[0023] The effects of the invention

[0024] According to the present invention, since rubber is inserted between the antenna and the substrate during the tire vulcanization process, the radio frequency identification tag can be completely embedded inside the tire, thereby improving the adhesion of the radio frequency identification tag to the tire and improving its durability.

[0025] Furthermore, according to the present invention, the radio frequency identification chip and the antenna do not need to be physically directly connected. This is different from the existing method where the physical direct connection between the radio frequency identification chip and the antenna will fail to work when broken. Since there is no physical direct connection required, it has the effect of longer service life and durability when embedded inside the tire.

[0026] Furthermore, according to the present invention, by using a wireless coupling method, after the antenna receives data, the RFID chip wirelessly receives data from the antenna, thus preventing the problem of the existing chip and antenna being unable to identify RFID tags due to the breakage of the physical connection.

[0027] Furthermore, according to the present invention, a protective cover is formed by an epoxy coating, thereby completely fixing the spacing between the RFID chip and the antenna, thus maintaining a high recognition rate even when using wireless coupling.

[0028] Furthermore, according to the present invention, the excellent adhesion of the RFID tag to the tire can be maintained for a long time, thereby further improving the durability of the tire with the RFID tag. Attached Figure Description

[0029] Figure 1 This is a perspective view of a radio frequency identification tag for embedding in a tire, according to an embodiment of the present invention.

[0030] Figure 2 This is a top view of a radio frequency identification tag for embedding in a tire, according to an embodiment of the present invention.

[0031] Figure 3 This is a side view from the front of an embodiment of the present invention of a radio frequency identification tag for embedding in a tire.

[0032] Figure 4 A state diagram of a radio frequency identification tag for embedding in a tire, prepared according to an embodiment of the present invention.

[0033] Figure 5 This is a side view of a radio frequency identification tag for embedding in a tire, according to an embodiment of the present invention.

[0034] Figure 6 This is a partial cross-sectional view of a conventional tire with an RFID tag affixed, according to an embodiment of the present invention.

[0035] Figure 7 This is a flowchart illustrating a method for preparing a radio frequency identification tag for embedding in a tire according to an embodiment of the present invention. Detailed Implementation

[0036] The following detailed description, through specific examples, illustrates the method for preparing a radio frequency identification (RFID) tag for embedding in a tire with improved durability and adhesion according to the present invention. However, the following embodiments are provided as examples to fully convey the spirit of the present invention to those skilled in the art.

[0037] Therefore, the present invention is not limited to the embodiments presented below, but may be embodied in other forms. The embodiments presented below are only used to illustrate the idea of ​​the present invention, and the present invention is not limited thereto.

[0038] In this context, unless otherwise defined, the technical and scientific terms used have the meanings commonly understood by one of ordinary skill in the art to which this invention pertains, and are defined in consideration of the functions in this invention. They may vary depending on the intentions or habits of the user or operator. Therefore, these terms should be defined based on the entire contents of this specification, and descriptions of well-known functions and structures that may unnecessarily obscure the spirit of this invention will be omitted in the following description.

[0039] Furthermore, unless the context clearly indicates otherwise, the singular form used in the specification and appended claims may also be intended to include the plural form.

[0040] The present invention will now be described in detail.

[0041] Figure 1 This is a perspective view of a radio frequency identification tag for embedding in a tire according to an embodiment of the present invention. Figure 2 This is a top view of a radio frequency identification tag for embedding in a tire according to an embodiment of the present invention. Figure 3 This is a side view from the front of an embodiment of the present invention of a radio frequency identification tag for embedding in a tire. Figure 4 A state diagram of a radio frequency identification tag for embedding in a tire, prepared according to an embodiment of the present invention.

[0042] refer to Figures 1 to 4 An embodiment of the present invention provides a wireless radio frequency identification (RFID) tag for embedding in a tire, comprising: a PCB substrate 100 having a predetermined length; an antenna 200 having a predetermined length and formed in a spiral shape, fitted along the length direction of the PCB substrate 100; and an RFID chip 300 disposed in the central portion of the PCB substrate, which wirelessly receives data from the antenna 200. Since the front / rear width of the interior formed by the spiral shape of the antenna 200 is greater than the front / rear width of the PCB substrate 100, a space can be formed between the PCB substrate 100 and the antenna 200 at a predetermined interval.

[0043] In this invention, PCB substrate refers to printed circuit board, which is a product structure made by printing and etching copper foil to form a pattern on a substrate with stacked copper plates. Printed circuit boards are usually equipped with components such as semiconductors, capacitors or resistors and can be used in various electronic devices (home appliances, computers, mobile communication devices or artificial satellites, etc.).

[0044] The PCB substrate 100 can be made of phenolic paper, fiberglass cloth epoxy resin (FR-4), fiberglass substrate epoxy resin (CEM-1, CEM-3), Teflon, metal, or ceramic, but is not limited to these. Preferably, FR-4 (Flame Retardant-4) material can be used as the PCB substrate.

[0045] When FR-4 is used as the PCB substrate 100, lightweight and thin RFID tags can be fabricated, and they can have high heat resistance. The circuitry of the PCB substrate 100 can be printed with gold and copper. Preferably, the PCB substrate 100 can have a thickness of 0.1 mm to 0.5 mm, a width of 1 mm to 5 mm, and a length of 25 mm to 75 mm. More preferably, it can have a thickness of 0.3 mm, a width of 3.5 mm, and a length of 40 mm. When the PCB substrate has a thickness of 0.2 mm, a width of 3 mm, and a length of 40 mm, even when inserted into the tire, the original performance of the tire is minimized and identification errors are reduced.

[0046] In this invention, the PCB substrate 100 is formed into a flat shape with a predetermined length. Furthermore, the antenna 200 has a predetermined length and is formed into a spiral shape, fitting along the length direction of the PCB substrate 100. Since the front / back width of the interior formed by the spiral shape of the antenna 200 is greater than the front / back width of the PCB substrate 100, a space can be formed between the PCB substrate 100 and the antenna 200 at a predetermined interval.

[0047] In this case, insertion holes are formed on the left and right sides of the PCB substrate 100, and one end and the other end of the antenna 200 can be connected to the left and right insertion holes of the PCB substrate 100, respectively.

[0048] For reference, the antenna 200 can be formed of a metallic material, for example, it can be formed of iron wire coated with brass. Furthermore, the antenna 200 can be formed in a spiral shape or a spring shape, in which case the number of coils can be 8 to 12.

[0049] Furthermore, the shape of the antenna 200 can be formed into various shapes such as circular, square, or horizontal. In this case, the number of coils can also be appropriately selected between 6 and 20.

[0050] As described above, the radio frequency identification tag for embedding in a tire according to an embodiment of the present invention is not formed in such a way that the antenna 200 is completely attached to the PCB substrate 100. Instead, a space is formed between the antenna 200 and the PCB substrate 100 at a predetermined distance. The adhesion of the radio frequency identification tag to the tire is further improved by the space, and the durability after attachment is further improved, so that it can be used for a long time.

[0051] Furthermore, according to one embodiment of the present invention, the radio frequency identification chip 300 and the antenna 200 should be spaced at a predetermined distance, and the predetermined distance should remain unchanged from the initial design and installation state. In particular, in the present invention, since the PCB substrate 100 and the antenna 200 are formed to have a predetermined length, it is very important to maintain the initial installation state and structure unchanged along the length direction (axial direction) of the PCB substrate 100 and the antenna 200.

[0052] If the distance between the RFID chip 300 and the antenna 200 changes from the initial installation state, the data transmission / reception rate between the wirelessly coupled RFID chip 300 and the antenna 200 may be inaccurate, and this error may reduce the recognition rate of the RFID reader.

[0053] In particular, since the present invention relates to an RFID tag embedded in a tire, the distance between the RFID chip 300 and the antenna 200 should remain constant even in harsh environments after being embedded inside the tire.

[0054] In this invention, the (initial installation) distance between the RFID chip 300 and the antenna 200 can be completely fixed by forming the protective cover 400 described later. Therefore, the data transmission / reception rate between the wirelessly coupled RFID chip 300 and the antenna 200 can always be kept constant, and the recognition rate of the RFID reader can be prevented from decreasing, thereby maintaining high quality.

[0055] The radio frequency identification (RFID) tag is affixed to the inside of the tire, more specifically, in a form that is embedded at a specified depth inside the tire.

[0056] In this invention, the rubber constituting the tire is embedded within the spatial portion, and the RFID tag is embedded in the tire in a spiral shape and integrally formed with the rubber. Since the inserted tire rubber simultaneously secures the PCB substrate 100 and the antenna 200, the adhesion between the RFID tag and the tire is improved. Furthermore, this enhanced adhesion further improves the durability of the tire.

[0057] In a wireless radio frequency identification tag for embedding in a tire according to an embodiment of the present invention, the radio frequency identification chip 300 may be configured to wirelessly receive data from the antenna 200.

[0058] Therefore, in this invention, the RFID chip 300 and the antenna 200 do not need to be physically directly connected. Compared with the previous situation where the physical direct connection between the RFID chip 300 and the antenna 200 was broken and the chip could not work, since there is no need for a physical direct connection, it has a longer service life when embedded inside the tire.

[0059] Furthermore, an embodiment of the present invention may include a protective cover 400 formed on the PCB substrate 100 to protect the RFID chip 300.

[0060] The protective cover 400 needs to be larger than the RFID chip 300 in order to protect the RFID chip 300.

[0061] Furthermore, if necessary, it can be configured to cover the antenna 200 to further improve durability.

[0062] For example, such as Figure 1 As shown, specifically, the antenna 200 is inserted into the protective cover 400. After the antenna 200 is attached, the protective cover 400 is molded, thereby achieving a form in which the antenna 200 is inserted (built into) inside the protective cover 400. This form is a structure in which the protective cover 300, molded in the central part, firmly fixes the antenna 200, thereby further improving stability. This improves durability and service life when embedded inside the tire.

[0063] And, as Figure 3 As shown, the protective cover 300 can be formed on the front and back sides of the PCB substrate 100, thereby allowing the protective cover 300 to completely fix the antenna 200.

[0064] That is, the (initial installation) distance between the RFID chip 300 and the antenna 200 can be completely fixed by forming the protective cover 300, so that the data transmission / reception rate between the RFID chip 300 and the antenna 200 in wireless coupling mode can always be kept constant.

[0065] Furthermore, as shown in the figure, the protective cover 300 can be elliptical in shape or rectangular as needed.

[0066] Furthermore, in a wireless radio frequency identification tag for embedding in a tire according to an embodiment of the present invention, at least one rubber inlet hole 101 may be formed along the length direction of the PCB substrate 100.

[0067] like Figure 2 As shown, three rubber inlet holes 101 can be formed on the left and right sides of the PCB substrate 100, respectively.

[0068] Rubber forming the tire can be inserted into the rubber inlet 101, thus allowing the RFID tag and rubber to be completely integrated and embedded inside the tire. Furthermore, since the tire rubber inserted in this way simultaneously fixes the PCB substrate 100 and the antenna 200, the adhesion between the RFID tag and the tire can be further improved.

[0069] Figure 7 This is a flowchart illustrating a method for preparing a radio frequency identification tag for embedding in a tire according to an embodiment of the present invention.

[0070] refer to Figure 7 A method for preparing a radio frequency identification (RFID) tag for embedding in a tire according to an embodiment of the present invention may include: step S100, preparing a PCB substrate 100 with an RFID chip 300 attached thereon; step S200, preparing a metal antenna 200 having a specified length and forming a spiral shape, wherein the front / back width of the interior formed by the spiral shape is greater than the front / back width of the PCB substrate 100; and step S300, inserting the antenna 200 into one end of the PCB substrate 100 for fitting.

[0071] Step S100 is the step of preparing the PCB substrate 100 on which the RFID chip 300 is attached. For example, the front / back width of the PCB substrate 100 can be 0.1 mm to 0.5 mm, preferably 0.3 mm. In this case, the front / back width of the PCB substrate 100 is... Figure 1 or Figure 2 As the standard.

[0072] Furthermore, in step S100 of preparing the PCB substrate, the radio frequency identification chip 300 can be pasted on the PCB substrate 100, and an insertion hole 105 can be formed. After the antenna 200 is inserted, the end of the antenna 200 can be inserted into it and connected.

[0073] For example, insertion holes 105 can be formed on the right and left sides of the PCB substrate 100, respectively.

[0074] Step S200 involves preparing a metal antenna 200 of a specified length, formed in a spiral shape. The front / back width of the interior formed by the spiral shape is greater than the front / back width of the PCB substrate 100. For example, stainless steel (iron wire) can be used as the main material to fabricate the antenna 200. For instance, the front / back width of the interior formed by the spiral shape, i.e., the width of the internal space of the antenna 200, can be from 0.15 mm to 1.0 mm, preferably 0.35 mm. In this case, the width of the internal space of the antenna 200 is... Figure 1 or Figure 2 As the standard.

[0075] Furthermore, the diameter of the antenna 200 can be made from 0.15 mm to 0.35 mm, preferably from 0.22 mm to 0.25 mm.

[0076] Step S300 is the step of inserting the antenna 200 into the end of the PCB substrate 100 for fitting, specifically the step of fitting the antenna 200, which is fabricated into a spiral shape. (See reference) Figure 2 The antenna 200 can be inserted into the left or right end of the PCB substrate 100 for fitting.

[0077] For example, one end of the antenna 200 can be connected to the left side of the PCB substrate 100, and the other end of the antenna 200 can be connected to the right side of the PCB substrate 100.

[0078] Furthermore, in the method for preparing a radio frequency identification tag for embedding in a tire according to an embodiment of the present invention, surface mounting (SMT, Surface Mount Technology) and coating with permanent ink can be performed in the PCB substrate preparation step (S100).

[0079] Permanent inks used for permanent ink coatings can include, but are not limited to, ultraviolet (UV) inks, thermosetting inks (IR inks), and PSR inks (photoimageable solder resist inks). Preferably, photoimageable black solder resist inks (PSR black) can be used. When the photoimageable black solder resist ink is used as a permanent ink, the thermosetting and photosetting components are mixed, thereby forming the desired image through exposure and development.

[0080] Because the modified ink is photosensitive, when exposed to ultraviolet light, only the portion exposed to the light cures, while the rest can be removed by a developer. The permanent ink protects the circuitry attached to the PCB substrate and has the effect of preventing solder bridges between circuits during the wave soldering process accompanying the mounting of components on the PCB substrate.

[0081] The permanent ink may contain 10 to 45 parts by weight of epoxyacrylate oligomer, 0.5 to 5 parts by weight of 1,3,5-triglycidyl isocyanurate, 1 to 20 parts by weight of epoxy resin, 3 to 15 parts by weight of acrylic resin, a photoinitiator, 10 to 30 parts by weight of pigment, 0.5 to 30 parts by weight of inorganic fillers, 10 to 40 parts by weight of solvent naphtha, and 5 to 25 parts by weight of diethylene glycol monoethyl ether acetate solvent.

[0082] The epoxy acrylate oligomer can be a diacrylate oligomer or a triacrylate oligomer for viscosity adjustment, but is not limited to these. By adding epoxy acrylate oligomers, the permanent ink can have advantages such as curing properties through a UV curing agent, prevention of yellowing, or improved adhesion.

[0083] The epoxy acrylate oligomer can be replaced by adipic acid at a ratio of 0.01 mol / L to 10 mol / L, but is not limited thereto. Replacing the epoxy acrylate oligomer with adipic acid can improve its curing properties, curing characteristics, and insulation properties.

[0084] The 1,3,5-triglycidyl isocyanurate (TGIC) can have a curing agent function and improve adhesion while enhancing electrical insulation, thereby forming a stable coating.

[0085] The photoinitiator may be 2-methyl-4'-(Methylthio)-2-morpholinopropiophenone, oligomeric alpha hydroxyketone, 2-hydroxy-2-methyl-1-phenyl propane, or a mixture thereof, but is not limited thereto. By adding the photoinitiator, the permanent ink cures quickly and binds effectively with the colorant to display color.

[0086] The colorant can be titanium dioxide (TiO2) or zinc oxide (ZnO), but is not limited to these. By adding the colorant, the permanent ink can be made to have ultraviolet absorption function, and the insulation of the permanent ink coating can be improved.

[0087] The inorganic filler can be barium sulfate, potassium permanganate (KMnO4), or similar compounds, but is not limited to these. By adding the inorganic filler, the printability, heat resistance, etc., of the permanent ink can be improved.

[0088] The solvent may include naphtha or diethylene glycol monoethyl ether acetate (carbitol acetate), corresponding to carbon numbers from C9 to C6. 16 Aromatic hydrocarbons with boiling points ranging from 165°C to 290°C. By adding the solvent to the permanent ink, the viscosity of the permanent ink can be adjusted by the solubility of the solvent.

[0089] In the step of coating the permanent ink, the coating thickness of the permanent ink can be from 80 μm to 120 μm, but is not limited to this. When the coating thickness of the permanent ink is less than 80 μm, it may lead to reduced heat resistance and sensitivity, and make it difficult to provide circuit protection. When it is greater than 120 μm, due to the etching effect, undercut may occur as grooves next to the conductor pattern, and rapid curing may occur, which may reduce the wireless identification efficiency of the RFID tag.

[0090] Furthermore, according to one embodiment of the present invention, it can be configured to include step S400 of molding the protective cover 400 onto the PCB substrate 100 that is coupled with the antenna 200.

[0091] After the PCB substrate 100 and the antenna 200 are combined through steps S100 to S300, a protective cover 400 is formed by molding on the PCB substrate 100.

[0092] In step S400, the protective cover 400 can be formed by epoxy resin coating or EMC molding.

[0093] When applying epoxy resin coating, the length, width, and thickness of the epoxy resin coating can be varied according to the size of the RFID chip 300 and the PCB substrate 100.

[0094] Epoxy molding compound (EMC) is an inorganic / organic composite material. It is based on thermosetting polymer materials that form a three-dimensional curing structure through external heat, and is mixed with inorganic materials to enhance the material's function. Its advantages lie in its excellent molding and mechanical properties.

[0095] Furthermore, according to an embodiment of the present invention, the method may be configured to include: step S500, coating a primer on the PCB substrate 100; and step S600, coating a rubber solution on the PCB substrate 100 coated with the primer.

[0096] In this invention, the radio frequency identification tag is prepared by including the step S500 of applying a primer, which can improve the adhesion between the permanent ink of the epoxy resin material coated on the surface of the PCB substrate 100 and the rubber solution.

[0097] The primer may be a liquid polymer compound with a solid content of 26% to 30% and a viscosity of 800 cps to 1500 cps, but is not limited thereto.

[0098] Because the primer has the specified solid content and viscosity, the primer applied to the surface of the PCB substrate 100 has good wettability, which can improve the adhesion to the rubber solution and reduce the phenomenon of film thinning caused by the liquid coating material sagging before drying.

[0099] The primer is a liquid mixture and can be made of resins such as polyamide, polyester, polyurethane, epoxy, synthetic resin, and polyolefin, but is not limited to these. Preferably, the primer can be a polyolefin resin.

[0100] The polyolefin resin may be a polyolefin resin having at least one functional group that reacts with permanent inks and rubber solutions, but is not limited thereto.

[0101] When the polyolefin resin is used as the primer, it can have excellent adhesion to the permanent ink and the rubber solution applied to the PCB substrate 200, even at operating temperatures above 100°C.

[0102] The primer may contain 45 to 50 parts by weight of xylene (C6H4(CH3)2) and 25 to 35 parts by weight of ethylbenzene (C8H4(CH3)2). 10), 1 to 5 parts by weight of zinc oxide (ZnO), 1 to 5 parts by weight of carbon black (C), 0.1 to 1.0 parts by weight of silica (SiO2), 10 to 15 parts by weight of synthetic resin, and 5 to 10 parts by weight of modified polyethylene.

[0103] Furthermore, the primer may also contain graphene with a particle size of approximately 20 nm to 50 nm. The graphene may have at least one particle shape selected from spherical, sheet-like, needle-like, rod-like, and tubular. Preferably, graphene with a spherical particle shape can be used; when the shape is not spherical, the graphene particles are formed into angular shapes, which reduces adhesion due to the angular portions. When a primer containing the graphene is applied, the risk of primer flow is low, and it has the effect of firmly maintaining the primer between the permanent ink applied to the PCB substrate 200 and the rubber solution during the subsequent application of the rubber solution. Preferably, the specific surface area of ​​the graphene is 1000 m². 2 / g to 2000m 2 / g, more preferably, can be 1500m 2 / g.

[0104] The graphene can be graphene that has been modified by surface treatment, which can be performed by irradiation with microwaves.

[0105] Furthermore, the particle size of the primer can be from 10 nm to 60 nm, but is not limited thereto. Preferably, the particle size of the primer can be from 30 nm to 40 nm.

[0106] When the particle size of the primer exceeds the condition, the smaller the particle size of the primer, the greater the specific surface area, resulting in a larger contact interface. This reduces the thickness of the primer coating on the surface of the RFID tag and may hinder the effect of uniform coating while improving adhesion to the permanent ink surface coated on the PCB substrate 100.

[0107] In the step of applying the primer, there are no restrictions on the application method and thickness of the primer. However, it is preferable to apply the primer with a thickness of 1 μm to 20 μm using a spraying method, and the primer can be applied multiple times until the desired thickness is achieved. Specifically, the primer can be applied to the PCB substrate 100 with a thickness of 5 μm to 15 μm. When the primer is applied to the desired thickness using the aforementioned coating method, it exhibits good wetting properties, thereby improving adhesion to permanent inks and rubber solutions, and reducing the phenomenon of liquid coating materials sagging before the primer dries, which would lead to a thinner film thickness.

[0108] Furthermore, after the primer coating step S500, the PCB substrate 200 coated with the primer can be dried using a dryer. For example, it can be dried at a temperature of 50°C to 100°C for 1 to 20 minutes, but is not limited thereto. Preferably, it can be dried at a temperature of 60°C to 90°C for 1 to 10 minutes.

[0109] When the PCB substrate 100 coated with primer is dried according to the drying conditions described, it can achieve the best adhesion to the permanent ink and rubber solution coated on the PCB substrate 100 in the optimal primer drying state.

[0110] In step S600, where the rubber solution is coated onto the PCB substrate 100 following the above steps, after the solvent evaporates, the remaining raw rubber has the same interface as the tire interlayer, thus improving adhesion. Therefore, when the PCB substrate 100 coated with the rubber solution is directly inserted into the tire for integral molding, it can achieve a semi-permanent adhesion with the tire. Furthermore, it reduces the risk of external damage, prevents RFID tag malfunctions by improving insulation, and protects the RFID tag from external moisture, thus preventing corrosion.

[0111] In this invention, the rubber solution can be prepared by mixing 40 to 100 parts by weight of inorganic filler, 0.1 to 10 parts by weight of vulcanizing agent, 2 to 10 parts by weight of vulcanization accelerator, 6 to 12 parts by weight of lubricant, 4 to 10 parts by weight of zinc oxide and 140 to 190 parts by weight of solvent relative to 100 parts by weight of raw rubber.

[0112] The raw material rubber may include natural rubber (NR), synthetic rubber (SR), or mixtures thereof, for use in common tire rubber compositions, but is not limited thereto.

[0113] When natural rubber and synthetic rubber are used as raw material rubber in combination, the natural rubber is mixed with synthetic rubber, which has good elasticity, wear resistance, and low-temperature performance but poor mechanical properties, thereby achieving the effect of high mechanical properties.

[0114] The raw material rubber may consist of natural rubber, synthetic rubber, or mixtures thereof at a concentration of 10 wt% to 50 wt%.

[0115] The natural rubber is preferably polyisoprene rubber obtained from nature.

[0116] The synthetic rubber may be selected from styrene-butadiene rubber (SBR), modified styrene-butadiene rubber, butadiene rubber (BR), modified butadiene rubber, chlorosulfonated polyethylene rubber (CSM), epichlorohydrin rubber (ECO), fluororubber (FRM / FKM), silicone rubber (SI), vinyl-methyl silicone rubber (VMQ), halogenated silicone rubber (FMQ), nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), and butyl rubber (IIR). ( ) rubber), Nitrile Butadiene Rubber (NBR), Modified Nitrile Butadiene Rubber, Chlorinated Polyethylene Rubber, Styrene-Ethylene-Butylene-Styrene Rubber (SEBS), Ethylene-Propylene Rubber (EPM), Ethylene-Propylene Rubber (EPDM), Hypalon Rubber, Chloroprene Rubber (CR), Ethylene Vinyl Acetate Rubber (EVM), Ethylene-Acrylic Rubber (AEM), ACM,The rubber comprises one or more of the following, but is not limited to: polyacrylate rubber, hydroquinone rubber, vinyl-benzyl-Chloride-Styrene-Butadiene rubber, bromo-Methyl-Styrene-Butyl rubber, Malaysian styrene-butadiene rubber, carboxylic styrene-butadiene rubber (XSBR), epoxy isoprene rubber, Malaysian ethylene-propylene rubber, carboxylic nitrile rubber, and brominated polyisobutyl isoprene-co-paramethyl styrene (BIMS).

[0117] The raw material rubber can be a mixture of natural rubber and synthetic rubber in a 50:50 weight ratio.

[0118] Using the mixed rubber at the stated weight ratio as the raw material rubber, the excellent wear resistance of natural rubber and the excellent oil resistance, corrosion resistance and abrasion resistance of synthetic rubber can be appropriately combined, thereby improving the durability of the RFID tag.

[0119] The inorganic filler may be selected from carbon black, alumina, aluminosilicate, calcium carbonate (CaCO3), diatomaceous earth, bentonite, montmorillonite, nontronite, beidellite, volkonskoite, hectorite, saponite, sauconite, vermiculite, halloisite, sericite, or mixtures thereof, but is not limited thereto. Preferably, it may be carbon black and calcium carbonate.

[0120] The carbon black can be from several commonly used sources and types. For example, it can be N110, N121, N134, N220, N231, N234, N242, N293, N299, N315, N326, N330, N332, N339, N343, N347, N351, N358, N375, N539, N550, N582, N630, N642, N650, N683, N754, N762, N765, N774, N787, N907, N908, N990, or N991, etc.

[0121] The inclusion of carbon black in the rubber solution enhances the rubber product due to its high surface area. Furthermore, the small particle size of the carbon black allows it to disperse easily in the rubber solution, thereby increasing molding speed and improving the durability, oil resistance, and heat resistance of the rubber product.

[0122] In the rubber solution, the carbon black content may be from 30 parts by weight to 70 parts by weight relative to 100 parts by weight of raw rubber, but is not limited thereto. Preferably, the carbon black content in the rubber solution may be from 40 parts by weight to 60 parts by weight relative to 100 parts by weight of raw rubber.

[0123] The calcium carbonate can be from several commonly used sources and types. In the rubber solution, the calcium carbonate content can be from 10 parts by weight to 30 parts by weight relative to 100 parts by weight of raw rubber, but is not limited thereto. Preferably, in the rubber solution, the calcium carbonate content can be from 15 parts by weight to 25 parts by weight relative to 100 parts by weight of raw rubber.

[0124] The vulcanizing agent can be selected from the group consisting of sulfur powder (S), insoluble sulfur (S), precipitated sulfur (S), and colloidal sulfur as inorganic vulcanizing agents, or tetramethylthiuram disulfide (TMTD), tetraethyltriuram disulfide (TETD), and dithiodimorpholine as organic vulcanizing agents, but is not limited thereto. Preferably, the vulcanizing agent can be sulfur powder.

[0125] The present invention will now be described in more detail by way of examples and comparative examples.

[0126] However, the following embodiments and comparative examples are merely examples for illustrating the present invention in more detail, and the present invention is not limited to the following embodiments and comparative examples.

[0127] <Example 1>

[0128] A PCB substrate 100 made of FR-4 material with a front / back width of 0.3mm, a top / bottom width of 3.5mm, and a left / right length of 40mm.

[0129] An antenna 200 with a spiral structure is fabricated, wherein the front / rear width of the antenna 200 is 0.35 mm. Furthermore, an RFID tag is used to form a spatial portion by fitting the antenna 200 onto the PCB substrate 100.

[0130] <Example 2>

[0131] An elliptical protective cover 400 is formed by molding to cover the radio frequency identification chip 300 mounted on the PCB substrate 100, and a three-coil antenna 200 is built into the protective cover 400. Otherwise, the same radio frequency identification tag as in Embodiment 1 is used.

[0132] <Comparative Example 1>

[0133] A PCB substrate 100 made of FR-4 material with a front / back width of 0.3mm, a top / bottom width of 3.5mm, and a left / right length of 40mm.

[0134] An antenna 200 with a spiral structure is fabricated, wherein the front / rear width of the antenna 200 is 0.35 mm. Furthermore, an RFID tag is used to embed the antenna 200 and form a spatial portion on the PCB substrate 100.

[0135] Furthermore, the RFID tag is used after the antenna 200 is embedded on the PCB substrate 100 and then compressed without forming a spatial portion.

[0136] <Experimental Example 1> - Adhesive Strength Test

[0137] To evaluate the improved adhesion of the RFID tags prepared according to Examples 1, 2 and Comparative Example 1, the RFID tags prepared according to Examples 1, 2 and Comparative Example 1 were directly inserted into the middle layer of the tire and integrally molded to prepare tire samples with a thickness of 1.0 cm, a length of 11 cm and a width of 3 cm, and the adhesion strength was determined by ASTM D429 (Method B) test method.

[0138] Tire samples affixed with RFID tags prepared according to the examples and comparative examples were left to stand at room temperature for 30 minutes, and then peeled off using a universal tensile testing machine at a speed of 100 mm / min to evaluate the adhesive strength. The average value calculated from five bonded samples is shown in Table 1. Adhesive strength is defined as the value obtained by dividing the width of the bonded sample by the average load.

[0139] [Table 1]

[0140]

[0141] As can be confirmed by Table 1, the adhesive strength of the RFID tag for embedding in the tire in Example 1 is improved compared to Comparative Example 1.

[0142] Moreover, as can be seen from Example 2, the adhesive strength of Example 2, which forms an elliptical protective cover 400 by molding, is improved compared to Example 1.

[0143] <Experimental Example 2> - Durability Test

[0144] Durability testing evaluates real-world performance under conditions that assume the tire's lifespan has ended. Durability testing is conducted at speeds of 200–240 km / h, loads of 440–830 kg, tire pressures of 44–51 psi, temperatures of 35–40°C, and running times of 60–80 minutes. The test involves driving at 200 km / h (more than twice the normal speed) for 20 minutes, then at 210 km / h for 10 minutes, 220 km / h for 10 minutes, 230 km / h for 20 minutes, and 240 km / h for 10 minutes.

[0145] Furthermore, the mileage is measured in units of 10,000 km, and the status of the tag is checked every 10,000 km.

[0146] [Table 2]

[0147]

[0148] Table 2 shows that the durability of the RFID tags for embedding in tires in Examples 1 and 2 is improved compared to Comparative Example 1. In particular, the durability of the RFID tag for embedding in tires in Example 2 is the best.

[0149] The detailed description of the preferred embodiments of the present invention disclosed above is provided to enable those skilled in the art to implement and practice the present invention. The above description refers to preferred embodiments of the present invention; however, those skilled in the art will understand that various modifications and alterations can be made to the present invention without departing from its scope. For example, those skilled in the art can utilize the structural elements described in the above embodiments by combining them with each other.

[0150] Therefore, the present invention is not intended to be limited to the embodiments described herein, but is intended to be given the broadest scope consistent with the principles and novel features disclosed herein.

[0151] This invention can be embodied in other specific forms without departing from its spirit and essential characteristics. Therefore, the detailed description above should not be construed as limiting in any way, but rather should be considered exemplary. The scope of this invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of this invention are included within its scope. This invention is not intended to be limited to the embodiments described herein, but rather to impart the broadest scope consistent with the principles and novel features disclosed herein. Furthermore, claims not expressly referenced within the scope of the invention may be combined to form embodiments or incorporated into new claims through post-application modifications.

[0152] Explanation of reference numerals in the attached figures

[0153] 100: PCB substrate, 200: antenna, 300: RFID chip, 400: protective cover, 101: rubber inlet hole, 105: insertion hole.

Claims

1. A radio frequency identification tag for embedding in a tire, characterized in that, include: PCB substrate, which has a specified length; An antenna, having a specified length, is formed in a spiral shape and is fitted along the length direction of the PCB substrate; as well as An RFID chip, disposed in the center portion of the PCB substrate, wirelessly receives data from the antenna. With the front / back width of the interior formed by the spiral shape of the antenna being greater than the front / back width of the PCB substrate, a space is formed between the PCB substrate and the antenna by a predetermined distance.

2. The radio frequency identification tag for embedding in a tire according to claim 1, characterized in that, Insertion holes are formed on the left and right sides of the PCB substrate, respectively. One end of the antenna is connected to the insertion hole on the left side of the PCB substrate. The other end of the antenna is connected to the insertion hole on the right side of the PCB substrate.

3. The radio frequency identification tag for embedding in a tire according to claim 1, characterized in that, It also includes a protective cover, which is molded onto the PCB substrate to protect the RFID chip. A portion of the antenna is embedded inside the protective cover to keep the spacing between the RFID chip and the antenna constant.

4. The radio frequency identification tag for embedding in a tire according to claim 1, characterized in that, At least one rubber inlet hole is formed along the length of the PCB substrate.

5. A method for preparing a radio frequency identification tag for embedding in a tire, characterized in that, Includes the following steps: The step of preparing a PCB substrate with an RFID chip attached, wherein the RFID chip wirelessly receives data from an antenna; The steps for manufacturing a metal antenna, wherein the antenna has a specified length and is formed in a spiral shape, and the front / back width of the interior formed by the spiral shape is greater than the front / back width of the PCB substrate; as well as The step of inserting the antenna into the end of the PCB substrate for fitting.

6. The method for preparing a radio frequency identification tag for embedding in a tire according to claim 5, characterized in that, Includes the following steps: The step of molding a protective cover onto a PCB substrate incorporating the antenna; The step of applying a primer to the PCB substrate; and The step of coating the PCB substrate with a rubber solution.

7. The method for preparing a radio frequency identification tag for embedding in a tire according to claim 5, characterized in that, It also includes the following steps: At least one rubber inlet hole is formed along the length of the PCB substrate.

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