RFID patch and tire

Abstract

To provide an RFID patch which is difficult to be peeled when being stuck to a tire.SOLUTION: An RFID patch has: an RFID tag having an RFID chip, an antenna connected to the RFID chip, and a coating resin layer for coating the RFID chip and the antenna; and an adhesive layer for boding the RFID tag and an object to be stuck and having a thickness of 1 mm or more.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to an RFID patch and a tire.

Background Art

[0002] In recent years, due to weight reduction and ease of recycling, it has been required to use thermoplastic resins, thermoplastic elastomers, etc. as tire materials, and tires using resin materials for tire skeleton members have been proposed. In addition, tires have been proposed in which an RFID (Radio Frequency Identification) chip storing tire information and the like and an RFID tag incorporating an antenna are attached to a tire using a resin material for such a tire skeleton member (see, for example, Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] It is conceivable to add an adhesive layer to the RFID tag to form an RFID patch and attach the RFID patch to the completed tire. However, when the RFID patch is attached to the tire and the tire is run, the RFID patch may be peeled off from the tire due to vibration or deformation of the tire.

[0005] An object of the present disclosure is to provide an RFID patch that is difficult to peel off when attached to a tire.

Means for Solving the Problems

[0006] The RFID patch of the first aspect includes an RFID tag having an RFID chip, an antenna connected to the RFID chip, and a coating resin layer covering the RFID chip and the antenna, and an adhesive layer with a thickness of 1 mm or more that adheres the RFID tag to an object to be pasted.

[0007] In the RFID patch of the first aspect, since the thickness of the adhesive layer is 1 mm or more, when the RFID patch is attached to a tire, the influence of vibration or deformation of the tire can be alleviated in the adhesive layer. Therefore, when the RFID patch is attached to a tire, it is less likely to peel off.

[0008] The RFID patch of the second aspect is the RFID patch of the first aspect, wherein the thickness of the adhesive layer is 25% or more of the total thickness.

[0009] In the RFID patch of the second aspect, since the thickness of the adhesive layer is 25% or more of the total thickness, when the RFID patch is attached to a tire, the influence of vibration or deformation of the tire can be alleviated in the adhesive layer. Therefore, when the RFID patch is attached to a tire, it is less likely to peel off.

[0010] The RFID patch of the third aspect is the RFID patch of the first aspect or the second aspect, wherein the adhesive layer has a lower hardness than the coating resin layer.

[0011] In the RFID patch of the third aspect, since the adhesive layer has a lower hardness than the coating resin layer, when the RFID patch is attached to a tire, the influence of vibration or deformation of the tire can be alleviated in the adhesive layer. Therefore, when the RFID patch is attached to a tire, it is less likely to peel off.

[0012] The RFID patch of the fourth aspect is the RFID patch of any one of the first to third aspects, wherein the adhesive layer includes, in order from the coating resin layer side, a first adhesive layer having adhesiveness on both the front and back surfaces, a buffer layer having buffering properties, and a second adhesive layer having adhesiveness on both the front and back surfaces.

[0013] In the RFID patch of the fourth aspect, since the adhesive layer has a first adhesive layer, a buffer layer having a buffering property, and a second adhesive layer, a material having no adhesiveness can be used for the buffer layer. Therefore, the degree of freedom in selecting the material of the buffer layer can be increased.

[0014] The RFID patch of the fifth aspect is the RFID patch of any one of the first to third aspects, wherein the adhesive layer is composed of a single layer having a buffering property and an adhesiveness.

[0015] In the RFID patch of the fifth aspect, since the adhesive layer is composed of a single layer having a buffering property and an adhesiveness, the configuration of the RFID patch can be simplified.

[0016] The tire of the sixth aspect has a skeleton member made of a resin material, and the RFID patch of any one of the first to fifth aspects is attached thereto.

[0017] In the tire of the sixth aspect, since the RFID patch of any one of the first to fifth aspects is attached thereto, the RFID patch is less likely to peel off.

Advantages of the Invention

[0018] As described above, according to the RFID patch and the tire of the present disclosure, the RFID patch attached to the tire can be made less likely to peel off.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0020] Referring to FIGS. 1 to 4, a tire 10 according to an embodiment of the present invention will be described. In each drawing, the same or substantially equivalent elements, members, and parts are given the same reference numerals. Also, the dimensions and ratios in the drawings are exaggerated for the convenience of explanation and may be different from the actual ratios. Further, in the cross-sectional view of FIG. 2, the internal structures of the RFID tag 60 and the adhesive layer 70 of the RFID patch 50 are omitted and shown.

[0021] (Tire Configuration) The tire 10 of the present embodiment shown in FIGS. 1 and 2 is a pneumatic tire that is used by filling air inside. The tire 10 includes a tire skeleton member 17. The tire skeleton member 17 includes a pair of bead portions 12, a side portion 14 that extends radially outward of the tire diameter from the bead portion 12, and a crown portion 16 that connects the radially outer ends of the respective side portions 14 in the tire diameter direction.

[0022] The tire skeleton member 17 is composed of a pair of tire skeleton halves 17A having the same shape of an annular shape in which one bead portion 12, one side portion 14, and a half-width crown half portion 16A are integrally formed. The tip 16B of the crown half portion 16A has a tapered shape on the tire equatorial plane CL side.

[0023] The pair of tire skeleton halves 17A are abutted against each other at the tip 16B of the crown half portion 16A and joined at the tire equatorial plane CL portion to form the tire skeleton member 17. A thermoplastic material 19 for welding is used for the joining at the tire equatorial plane CL portion.

[0024] On the radially outer side of the crown portion 16 in the tire diameter direction, a tread portion 30 that constitutes a tire tread, which is a grounding portion of the tire, is disposed.

[0025] The tire skeletal member 17 is formed of a resin material. The resin material herein does not include vulcanized rubber. Examples of the resin material include thermoplastic resins (including thermoplastic elastomers), thermosetting resins, and other general-purpose resins, as well as engineering plastics (including super engineering plastics).

[0026] The thermoplastic resin (including thermoplastic elastomers) refers to a polymer compound that softens and flows as the temperature rises and becomes relatively hard and strong when cooled. In this specification, among them, a polymer compound that softens and flows as the temperature rises and becomes relatively hard and strong when cooled, and has rubber-like elasticity is defined as a thermoplastic elastomer, and a polymer compound that softens and flows as the temperature rises and becomes relatively hard and strong when cooled, and does not have rubber-like elasticity is defined as a thermoplastic resin that is not an elastomer.

[0027] Examples of the thermoplastic resin (including thermoplastic elastomers) include polyolefin-based thermoplastic elastomers (TPO), polystyrene-based thermoplastic elastomers (TPS), polyamide-based thermoplastic elastomers (TPA), polyurethane-based thermoplastic elastomers (TPU), polyester-based thermoplastic elastomers (TPC), and dynamically crosslinked thermoplastic elastomers (TPV), as well as polyolefin-based thermoplastic resins, polystyrene-based thermoplastic resins, polyamide-based thermoplastic resins, and polyester-based thermoplastic resins.

[0028] In addition, as the above thermoplastic material, for example, those having a heat distortion temperature (at a load of 0.45 MPa) specified in ISO 75-2 or ASTM D648 of 78 °C or higher, a tensile yield strength specified in JIS K7113 of 10 MPa or higher, a tensile fracture elongation (JIS K7113) specified in JIS K7113 of 50% or higher, and a Vicat softening temperature (Method A) specified in JIS K7206 of 130 °C can be used.

[0029] A thermosetting resin refers to a polymer compound that forms a three-dimensional network structure and cures as the temperature rises. Examples of thermosetting resins include phenolic resins, epoxy resins, melamine resins, urea resins, and the like.

[0030] In addition to the aforementioned thermoplastic resins (including thermoplastic elastomers) and thermosetting resins, general-purpose resins such as (meth)acrylic resins, EVA resins, vinyl chloride resins, fluorine-based resins, and silicone-based resins may also be used as the resin material.

[0031] In this embodiment, the case where the tire skeleton member 17 is formed of a thermoplastic resin will be described.

[0032] The tire skeleton half-body 17A formed using a thermoplastic material can be molded, for example, by vacuum molding, pressure-air molding, injection molding, melt casting, etc. Compared with the case of molding (vulcanizing) with rubber, the manufacturing process can be significantly simplified, and the molding time can also be shortened.

[0033] Note that the tire skeleton member 17 may be composed of a single thermoplastic material, or, similar to a conventional general rubber pneumatic tire, thermoplastic materials having different characteristics may be used for each part of the tire skeleton member 17 (such as the side part 14, the crown part 16, the bead part 12, etc.).

[0034] An annular bead core 15 is embedded in the bead part 12 of the tire skeleton member 17. The bead core 15 is made of a steel cord, similar to a conventional general pneumatic tire. Note that if the rigidity of the bead part 12 is ensured and there is no problem in fitting with a rim (not shown), the bead core 15 may be omitted. Also, the bead core 15 may be formed of a cord other than steel, such as an organic fiber cord or a cord in which an organic fiber is resin-coated, and furthermore, the bead core 15 may be formed of a hard resin by injection molding or the like instead of a cord.

[0035] The crown portion 16 of the tire skeletal member 17 is provided with a cord reinforcing layer 28 including a steel cord 26S wound in a spiral shape. The cord reinforcing layer 28 corresponds to a belt disposed on the outer peripheral surface of the carcass of a conventional pneumatic tire made of rubber.

[0036] A covering layer 24 is formed on the tire skeletal member 17 from the bead portion 12 to the outside in the tire axial direction W of the crown portion 16. The end portion of the covering layer 24 on the bead portion 12 side is disposed inside the tire with respect to the contact portion with the rim (not shown) of the bead portion 12. The covering layer 24 of the present embodiment includes a first covering layer 24R extending from one bead portion 12 to a position slightly exceeding the tire equatorial plane CL, and a second covering layer 24L extending from the other bead portion 12 to a position slightly exceeding the tire equatorial plane CL and overlapping the first covering layer 24R on the tire equatorial plane CL.

[0037] The first covering layer 24R and the second covering layer 24L are configured such that a reinforcing material is covered with a resin material. As the resin material, for example, the same material as the resin material constituting the tire skeletal member 17 is used. The covering with the resin material may be on one side or both sides of the reinforcing material. When covering both sides of the reinforcing material with the resin material, the reinforcing material can be disposed at the center in the thickness direction of the first covering layer 24R and the second covering layer 24L. In the case of double-sided covering, different resin materials may be used for one side and the other side.

[0038] The reinforcing material is, for example, a twisted cord or an aggregate of a plurality of filaments. The material of the reinforcing material is, for example, a metal such as aliphatic polyamide, polyethylene terephthalate, glass, aramid, steel, etc. In the first covering layer 24R and the second covering layer 24L, the reinforcing material extends at least along the tire radial direction. A reinforcing material extending in the tire circumferential direction may be combined with this reinforcing material so that the reinforcing materials overlap each other. In this case, the reinforcing materials may be woven or knitted to form a cloth shape. Note that the reinforcing material may be inclined with respect to the tire radial direction or the tire circumferential direction.

[0039] On the outer side in the tire radial direction of the tire skeleton member 17, a tread portion 30 is disposed outside the covering layer 24, and on the outer side in the tire width direction of the tire skeleton member 17, a side member 31 is disposed outside the covering layer 24.

[0040] The tread portion 30 constitutes the tire tread which is the grounding portion of the tire 10.

[0041] The tread portion 30 is formed of rubber having better wear resistance than the thermoplastic resin of the tire skeleton member 17. As the rubber used for the tread portion 30, the same type of rubber as that used for conventional pneumatic rubber tires can be used. In addition, as the tread portion 30, a tread portion 30 composed of another type of thermoplastic resin having better wear resistance than the thermoplastic resin forming the side portion 14 may be used.

[0042] For the side member 31, the same type of rubber as that used for conventional pneumatic rubber tires can be used.

[0043] (RFID patch) The RFID patch 50 of the present embodiment shown in FIGS. 3 and 4 includes an RFID tag 60 having an RFID chip 62, an antenna 64 connected to the RFID chip 62, and a coating resin layer 66 covering the RFID chip 62 and the antenna 64, and an adhesive layer 70 having a thickness of 1 mm or more for adhering the RFID tag 60 and the tire 10 which is an object to be pasted.

[0044] The RFID patch 50 is configured to be attachable to the tire 10 by the adhesive layer 70 in order to attach the RFID tag 60 to the completed tire 10 later. The RFID patch 50 has flexibility and is configured to be deformable in accordance with the deformation of the tire 10.

[0045] The RFID tag 60 is a wireless tag having a function of communicating wirelessly by transmitting and receiving radio waves via the antenna 64, and is capable of receiving the radio waves emitted by the reader and transmitting wirelessly the information recorded in the RFID chip 62 and the like.

[0046] As the resin material constituting the coating resin layer 66, it is preferable to use the same type of resin material as the thermoplastic resin of the cord reinforcing layer 28.

[0047] The adhesive layer 70 is formed to have a thickness of 1 mm or more and has buffering properties and adhesiveness. The adhesive layer 70 of the present embodiment includes, in order from the RFID tag 60 side, a first adhesive layer 71 having adhesiveness on both the front and back surfaces, a buffer layer 72 having buffering properties, and a second adhesive layer 73 having adhesiveness on both the front and back surfaces.

[0048] The first adhesive layer 71 and the second adhesive layer 73 can be constituted by a double-sided tape having a base material such as paper or cellophane, a double-sided tape having no base material, or an adhesive coating layer or the like.

[0049] The buffer layer 72 can be constituted by rubber, sponge, or the like.

[0050] Note that the thickness of the adhesive layer 70 is preferably 25% or more of the total thickness of the RFID patch 50. Further, the thickness of the adhesive layer 70 is more preferably 40% or more of the total thickness of the RFID patch 50. Also, the adhesive layer 70 preferably has a lower hardness than the coating resin layer. In the present embodiment, the thickness of the adhesive layer 70 is set to 25% or more of the total thickness of the RFID patch 50, and the hardness of the adhesive layer 70 is made lower than that of the coating resin layer 66.

[0051] The RFID patch 50 of the present embodiment is attached to the inner peripheral surface of the tire carcass member 17 at the central position in the tire axial direction W with its longitudinal direction oriented in the tire circumferential direction.

[0052] (Function, effect) In the RFID patch 50 of the present embodiment, since the thickness of the adhesive layer 70 is 1 mm or more, when the RFID patch 50 is attached to the tire 10, the influence of vibration or deformation of the tire 10 can be mitigated in the adhesive layer 70. Therefore, when the RFID patch 50 is attached to the tire 10, it is less likely to peel off.

[0053] Also, in the RFID patch 50 of the present embodiment, since the thickness of the adhesive layer 70 is set to 25% or more of the overall thickness, when the RFID patch 50 is attached to the tire, the influence of vibrations or deformations of the tire 10 can be mitigated in the adhesive layer 70. Therefore, when the RFID patch 50 is attached to the tire 10, it becomes difficult to peel off.

[0054] Also, in the RFID patch 50 of the present embodiment, since the hardness of the adhesive layer 70 is lower than that of the coating resin layer 66, when the RFID patch 50 is attached to the tire 10, the influence of vibrations or deformations of the tire 10 can be mitigated in the adhesive layer 70. Therefore, when the RFID patch 50 is attached to the tire 10, it becomes difficult to peel off.

[0055] Also, in the RFID patch 50 of the present embodiment, since the adhesive layer 70 has a first adhesive layer 71, a buffer layer 72 having buffering properties, and a second adhesive layer 73, a material having no adhesiveness can be used for the buffer layer 72. Therefore, the degree of freedom in selecting the material of the buffer layer 72 can be increased.

[0056] [Other Embodiments] As described above, one embodiment of the technology of the present disclosure has been described. However, the technology of the present disclosure is not limited to the above, and it goes without saying that various modifications can be made within the scope not departing from the gist thereof other than the above.

[0057] For example, in the above embodiment, the RFID patch 50 was attached to the tire 10 with the longitudinal direction facing the tire circumferential direction. However, the RFID patch 50 may be attached to the tire 10 with the longitudinal direction facing a direction inclined with respect to the tire circumferential direction, or the RFID patch 50 may be attached to the tire 10 with the longitudinal direction facing the tire width direction.

[0058] Also, in the above embodiment, the RFID patch 50 was attached to the crown portion 16 on the inner circumferential surface of the tire skeletal member 17, but it may be attached to the side portion 14.

[0059] Also, in the above embodiment, the RFID tag 60 of the RFID patch 50 is composed of an RFID chip 62, an antenna 64, and a coating resin layer 66, but other members or layers may be further added.

[0060] Also, in the above embodiment, the adhesive layer 70 of the RFID patch 50 has a first adhesive layer 71, a buffer layer 72 having buffering properties, and a second adhesive layer 73. However, as shown in FIG. 5, it may be composed of a single buffer adhesive layer 74 having buffering properties and adhesiveness. As the buffer adhesive layer 74 having buffering properties and adhesiveness, for example, butyl rubber or the like can be used.

[0061] Also, in the above embodiment, the tire skeleton member 17 is formed of a resin material. However, the tire skeleton member 17 may be a tire skeleton (tire case) of a conventional pneumatic tire including a carcass in which cords are rubber-coated, a rubber inner liner, a rubber bead filler, and the like.

Explanation of Reference Numerals

[0062] 10 Tire 12 Bead portion 14 Side portion 15 Bead core 16 Crown portion 17 Tire skeleton member 17A Half tire skeleton 24 Coating layer 28 Cord reinforcing layer 30 Tread portion 31 Side member 50 RFID patch 60 RFID tag 62 RFID chip 64 Antenna 66 Coating resin layer 70 Adhesive layer 71 First adhesive layer 72 Buffer layer 73 Second adhesive layer 74 Buffer adhesive layer

Claims

1. An RFID tag having an RFID chip, an antenna connected to the RFID chip, and a coating resin layer covering the RFID chip and the antenna, and an adhesive layer having a thickness of 1 mm or more for adhering the RFID tag to an object to be pasted. An RFID patch.

2. The thickness of the adhesive layer is 25% or more of the total thickness. The RFID patch according to Claim 1.

3. The adhesive layer has a lower hardness than the coating resin layer. The RFID patch according to Claim 1.

4. The adhesive layer in order from the coating resin layer side, has a first adhesive layer having adhesiveness on both the front and back surfaces, a buffer layer having buffering properties, and a second adhesive layer having adhesiveness on both the front and back surfaces. The RFID patch according to Claim 1.

5. The adhesive layer is composed of a single layer having buffering properties and adhesiveness. The RFID patch according to Claim 1.

6. Having a skeleton member made of a resin material, A tire to which the RFID patch according to any one of Claims 1 to 5 is attached.

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