JP2019098996A - Tire and method for producing tire - Google Patents

Abstract

To provide a tire that can remove properly a release agent attached to an installation area where a functional component is installed, and a method for producing a tire.SOLUTION: A tire 1 has an installation area 12 where a functional component 10 is installed. In the installation area 12, a release agent 9 is removed, and it contains infrared absorbing substance.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a tire that can be equipped with functional components on the inner surface of the tire and a method of manufacturing the tire.

  BACKGROUND ART Conventionally, a technique is known in which a functional component (for example, a sensor, a transponder, etc.) is installed on the inner surface of a tire (Patent Document 1). When installing a functional component on the inner surface of the tire, it is necessary to remove the release agent. The release agent is applied to the inner surface of the tire in order to facilitate the release of the bladder and the tire in the curing step, and remains on the inner surface of the tire after the release. This mold release agent reduces the adhesive strength between the functional component and the inner surface of the tire. Then, the invention which concerns on patent document 1 irradiates a laser to tire inner surface, and is removing the mold release agent.

JP 2005-350057

  However, the invention according to Patent Document 1 only discloses that the laser is irradiated to the inner surface of the tire, and it can not be said that the release agent can be necessarily removed properly.

  The present invention has been made in view of the above problems, and an object thereof is to provide a tire and a method of manufacturing a tire capable of appropriately removing a release agent adhering to an installation area where a functional component is installed. It is.

  The tire according to the present invention has an installation area in which functional components are installed. The installation area is freed of the mold release agent and contains an infrared absorbing material.

  The infrared absorbing material according to the present invention absorbs infrared light having a wavelength of 1000 nm to 1100 nm. The reflectance of infrared rays reflected by the infrared absorbing material is 30% or less.

  The tire inner surface according to the present invention has a region including an infrared absorbing material in the tire depth direction.

  The release agent according to the present invention comprises an infrared absorbing material.

  The functional component according to the present invention is an electronic device.

  The tire according to the present invention comprises functional components.

  According to the present invention, it is possible to appropriately remove the release agent adhering to the installation area where the functional component is installed.

FIG. 1 is a cross-sectional view in the tire width direction along the tire radial direction of a tire according to an embodiment of the present invention. FIG. 2 is a cross-sectional view for explaining the positional relationship between the functional component, the mold release agent, and the inner surface of the tire. Fig.3 (a)-(c) is sectional drawing explaining the positional relationship of a functional component, a mold release agent, and the tire inner surface. FIG. 4 is a flowchart showing a method of manufacturing a tire according to an embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same parts will be denoted by the same reference numerals and the description thereof will be omitted.

(Structure of tire)
The configuration of the tire 1 according to the present embodiment will be described with reference to FIG. As shown in FIG. 1, the tire 1 includes a pair of bead portions 2 in contact with a rim (not shown), a carcass layer 3 forming a skeleton of the tire 1, a tread portion 4 having a ground contact surface in contact with a road surface And a pair of side wall portions 6 connected to both sides of the portion 4.

  The carcass layer 3 extends in a toroidal manner between the bead cores 5. At least two bead cores 5 are disposed apart in the tire width direction.

  A belt layer 7 is provided between the carcass layer 3 and the tread portion 4. A plurality of belt layers 7 are stacked along the tire circumferential direction.

  A release agent 9 adheres to the inner surface 8 of the tire 1. The release agent 9 is applied to the inner surface in the vulcanization step and remains on the inner surface 8 after vulcanization. In the vulcanization step, the bladder is expanded to press the inner surface of the unvulcanized tire. When vulcanization is completed, a release agent is applied to the inner surface of the unvulcanized tire so that the bladder and the inner surface of the tire do not contact with each other. Then, as shown in FIG. 1, the release agent 9 remains on the inner surface 8 after vulcanization. The release agent 9 is, for example, silicon. In the present embodiment, the inner surface 8 of the tire 1 refers to the surface on the space inside the tread portion 4.

  As shown in FIG. 1, the release agent 9 adheres to the inner surface 8 from the widest part of the sidewall portion 6 to the bead portion 2, but this is an example, and the release agent 9 adheres. A part is not limited to this.

  Next, with reference to FIG. 2, the functional component 10 installed on the inner surface 8 of the tire 1 will be described. The functional component 10 is, for example, a sensor, a sponge, or a sealant. The sensor is an electronic device, which measures the internal pressure of the tire 1 or detects the gravity. The sponge absorbs the sound of the tire 1. The sealant prevents air leakage during punctures. The sensor may be set on a rubber pedestal, and the pedestal may be installed on the inner surface 8. The functional component 10 also includes such a pedestal.

  The functional component 10 is fixed to the inner surface 8 by the adhesive 11. However, as shown in FIG. 2, when the release agent 9 is attached to the inner surface 8, the adhesive strength of the adhesive 11 may be reduced by the release agent 9. Thereby, the adhesive strength between the functional component 10 and the inner surface 8 may be reduced.

  So, in this embodiment, the mold release agent 9 is removed appropriately using an infrared laser, and the adhesive strength of the functional component 10 and the inner surface 8 is improved.

  Next, removal of the release agent 9 using an infrared laser will be described with reference to FIG.

  As shown to Fig.3 (a), when the mold release agent 9 has adhered to the installation area | region 12 in which the functional component 10 is installed, the infrared rays laser is irradiated to the inner surface 8, and the mold release agent 9 is removed. Specifically, an infrared laser is irradiated to a region 8 a formed in the tire depth direction from the inner surface 8. The area 8 a is an area included in the installation area 12 where the functional component 10 is installed. Region 8a also contains an infrared absorbing material.

  Here, the principle of removal of the release agent 9 using an infrared laser will be described. When the inner surface 8 (area 8a) is irradiated with the infrared laser, the laser beam of the infrared laser is absorbed by the inner surface 8 (area 8a). The laser light absorbed by the inner surface 8 (region 8a) is converted to heat. This thermal energy evaporates the release agent 9. Thereby, the release agent 9 is removed.

  As described above, in order to efficiently convert the laser beam of the infrared laser into heat, the inner surface 8 preferably absorbs the laser beam efficiently. So, in this embodiment, as shown to Fig.3 (a), the area | region 8a containing an infrared rays absorption material is formed toward the tire depth direction from the inner surface 8. As shown to FIG. The infrared absorbing material in the present embodiment is, for example, carbon, and absorbs infrared light having a wavelength of 1000 nm to 1100 nm. In addition, the infrared absorbing material contains a material having a low infrared reflectance. The reflectance of the laser beam reflected by the infrared absorbing material is preferably 30% or less. If the reflectance is greater than 30%, the reflected laser light is irradiated to the area other than the area from which the releasing agent 9 is removed. As a result, the area other than the area from which the release agent 9 is removed may be damaged by heat, which may lower the durability of the inner surface member. Also, when the laser light is reflected, the absorbed laser light is relatively small. If the amount of laser light absorbed is relatively small, the thermal energy will be insufficient. As a result, the release agent 9 is not sufficiently removed, and the adhesive strength of the functional component 10 may be reduced. For the above reasons, the reflectance is preferably 30% or less.

  In FIG. 3A, the region 8 a containing the infrared absorbing material is formed on a part of the inner surface 8, but this is an example, and the region 8 a may be formed on the entire inner surface 8.

  As shown in FIG. 3A, when the region 8a containing the infrared absorbing material is irradiated with the infrared laser, the releasing agent 9 is removed by the thermal energy. Thereby, as shown in FIG.3 (b), the recessed part 13 from which the mold release agent 9 was removed is formed. Thereafter, as shown in FIG. 3C, the functional component 10 is installed in the recess 13. Thus, the adhesive strength of the functional component 10 and the inner surface 8 improves by installing the functional component 10 in the recessed part 13 from which the mold release agent 9 was removed.

  The installation area 12 where the functional component 10 is installed, that is, the area from which the mold release agent 9 is removed may be one or more.

  In addition, although it demonstrated that the area | region 8a contains an infrared rays absorptive material in this embodiment, it is not limited to this. For example, the release agent 9 may contain an infrared absorbing material. When the releasing agent 9 contains an infrared absorbing material, the infrared laser is irradiated to the releasing agent 9, and the releasing agent 9 is removed by thermal energy. In addition, the region 8a may contain an infrared absorbing material, and the releasing agent 9 may also contain an infrared absorbing material.

[Experimental result]
Next, experimental results on the reflectance of laser light of infrared laser will be described.

  In the experiment, a release agent containing no infrared absorbing material (comparative example) and a releasing agent containing an infrared absorbing material (example) were used. The inventors irradiated the two mold release agents with an infrared laser to measure the reflectance of the laser light. In addition, in this experiment, the inventor attached the reflection measurement unit of 1-mm condensing type to the ultraviolet visible infrared spectrophotometer MV-3300 made by JASCO Corporation, and measured the reflectance of a laser beam.

[Comparative example]
As a release agent of the comparative example, mica containing no infrared absorbing material was used. The inventor applied a mold release agent to the inner surface with a thick film of 50 μm or more and vulcanized the tire. The inventor irradiated an infrared laser to the releasing agent remaining on the tire after vulcanization and measured the reflectance of the laser light. The reflectance of the wavelength of 1000 nm to 1100 nm was 32 to 35%.

  When the inventor irradiated the release agent with an infrared laser having a wavelength of 1090 nm, part of the reflected light hit the bead portion, and the tire drum durability decreased. Moreover, when the functional component was installed in 30 tires of the comparative example and left at room temperature for six months, the functional component peeled off in one tire. Thus, the adhesive strength of the functional component was insufficient.

[Example]
As a mold release agent of the example, black mica containing 10% of carbon which is an infrared absorbing material was used. The inventor applied a mold release agent to the inner surface with a thick film of 50 μm or more and vulcanized the tire. The inventor irradiated an infrared laser to the releasing agent remaining on the tire after vulcanization and measured the reflectance of the laser light. The reflectance of the wavelength of 1000 nm to 1100 nm was 20 to 25%.

  When the inventor irradiated the release agent with an infrared laser having a wavelength of 1090 nm, no decrease in tire drum durability was confirmed. Moreover, when the functional component was installed in 30 tires of an Example and it left at room temperature for six months, the tire in which the functional component peeled was not confirmed.

  According to the above experimental results, if the reflectance of the laser beam reflected by the infrared absorbing material is 30% or less, the tire drum durability does not decrease, and the release agent can be appropriately removed, and the functional component is adhered It can be seen that the strength is improved.

  Next, with reference to the flowchart of FIG. 4, a method of manufacturing the tire 1 according to the present embodiment will be described. As shown in FIG. 4, the method of manufacturing the tire 1 includes an unvulcanized tire preparation step S10, a vulcanization step S20, an irradiation step S30, and an installation step S40.

  In the unvulcanized tire preparation step S10, an unvulcanized tire is prepared.

  Next, in the vulcanization step S20, the release agent 9 is applied to the inner surface of the unvulcanized tire. The release agent 9 may contain an infrared absorbing material. In addition, when the release agent 9 does not contain the infrared absorbing material, in the unvulcanized tire, a region including the infrared absorbing material may be formed from the inner surface in the tire depth direction. The bladder is inflated to press the inner surface of the unvulcanized tire. Thereafter, the unvulcanized tire is vulcanized by the vulcanizing mold. After vulcanization, the release agent 9 remains on the inner surface 8 of the tire 1.

  Next, in the irradiation step S30, an infrared laser is irradiated to the installation area 12 where the functional component 10 is installed. As shown in FIG. 3A, when the inner surface 8 (region 8a) contains an infrared absorbing material, the region 8a is irradiated with an infrared laser. When the release agent 9 contains an infrared absorbing material, the release agent 9 is irradiated with an infrared laser. The irradiated laser light is converted to heat, and the heat energy removes the release agent 9.

  Next, in the installation step S40, the functional component 10 is installed in the area where the release agent 9 is removed. Thereby, the adhesive strength between the functional component 10 and the inner surface 8 is improved.

[Function effect]
As described above, the tire 1 has the installation area 12 in which the functional component 10 is installed. A release agent 9 is attached to the installation area 12. The releasing agent 9 may contain an infrared absorbing material. In addition, in the installation area 12, an area 8a including an infrared absorbing material is formed. When the release agent 9 or the region 8a is irradiated with an infrared laser, the laser light is converted to heat. The release agent 9 is removed by this heat energy. Since the reflectance of the laser beam reflected by the infrared absorbing material is 30% or less, the infrared absorbing material can efficiently convert the laser beam of the infrared laser into heat. Thereby, the present invention can remove appropriately mold release agent 9 adhering to installation field 12 in which functional component 10 is installed. Moreover, since the reflectance of the laser beam which an infrared rays absorbing material reflects is 30% or less, this invention can prevent that a reflected light exerts a bad influence on durability of an inner surface member.

  While the embodiments of the present invention have been described above, it should not be understood that the statements and drawings that form a part of this disclosure limit the present invention. Various alternative embodiments, examples and operation techniques will be apparent to those skilled in the art from this disclosure.

  For example, if the inner surface 8 is provided with an inner liner, the inner liner may comprise an infrared absorbing material.

DESCRIPTION OF SYMBOLS 1 tire 2 bead part 3 carcass layer 4 tread part 5 bead core 6 side wall part 7 belt layer 8 inner surface 8a area 9 mold release agent 10 functional component 11 adhesive 12 installation area 13 recessed part

Claims (7)

A tire capable of providing functional components on the inner surface of the tire,
Having an installation area in which the functional component is installed;
The said installation area | region is a tire in which the mold release agent is removed, and an infrared rays absorbing material is included. The infrared absorbing material absorbs infrared radiation having a wavelength of 1000 nm to 1100 nm,
The tire according to claim 1, wherein a reflectance of the infrared light reflected by the infrared light absorbing material is 30% or less.   The tire according to claim 1 or 2, wherein the tire inner surface has a region including the infrared absorbing material in a tire depth direction.   The tire according to any one of claims 1 to 3, wherein the release agent contains the infrared absorbing material.   The tire according to any one of claims 1 to 4, wherein the functional component is an electronic device.   The tire according to any one of claims 1 to 5, comprising the functional component. A method of manufacturing a tire capable of providing a functional component on the inner surface of the tire, comprising:
Applying a release agent to the inner surface of the unvulcanized tire;
Vulcanizing the unvulcanized tire to which the mold release agent has been applied;
Irradiating an infrared ray to an installation area where the functional component is installed in the tire after vulcanization;
The method of manufacturing a tire, wherein the installation area includes an infrared absorbing material.

Images