JP2019209505A - Manufacturing method of tire - Google Patents

Abstract

To provide the manufacturing method of the tire, that can remove a release agent attached to a functional component and can improve adhesive strength between the functional component and an inner surface of the tire.SOLUTION: A functional component 200 has an adhesion surface 140 that adheres to a tire inner surface 30. The manufacturing method of a tire comprises attaching the functional component 200 to the tire inner surface 30 after irradiating a laser to the adhesion surface 140 of the functional component 200.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tire manufacturing method.

  Conventionally, a technique for installing a functional component (for example, a sensor or a transponder) on a tire inner surface is known (Patent Document 1). When functional parts are installed 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 vulcanization process, and remains on the inner surface of the tire after release. This release agent reduces the adhesive strength between the functional component and the tire inner surface. Therefore, the invention according to Patent Document 1 irradiates the tire inner surface with a laser to remove the release agent.

JP 2005-350057 A

  A release agent may also adhere to functional parts. However, the invention according to Patent Document 1 only mentions a release agent adhering to the tire inner surface. Even when a release agent adheres to the functional component, the adhesive strength between the functional component and the tire inner surface may be reduced.

  The present invention has been made in view of the above problems, and an object of the present invention is to remove a release agent adhering to a functional component and improve the adhesive strength between the functional component and the tire inner surface. It is to provide a manufacturing method.

  In the tire manufacturing method according to the present invention, the functional component is attached to the inner surface of the tire after irradiating the adhesive surface of the functional component with laser.

  According to the present invention, the release agent adhering to the functional part can be removed, and the adhesive strength between the functional part and the tire inner surface can be improved.

FIG. 1 is a cross-sectional view of a pneumatic tire according to an embodiment of the present invention along the tire width direction and the tire radial direction. FIG. 2 is a perspective view of the functional component and the functional component mounting base according to the embodiment of the present invention. FIG. 3 is a side view of the functional component and the functional component mounting base according to the embodiment of the present invention. FIG. 4 is a side view of the functional component and the functional component mounting base according to the embodiment of the present invention. FIG. 5 is a side view of the functional component and the functional component mounting base according to the embodiment of the present invention. FIG. 6A is a diagram for explaining the positional relationship among the functional component, the release agent, and the tire inner surface. FIG. 6B is a diagram illustrating a positional relationship among the functional component, the release agent, and the tire inner surface. FIG. 6C is a diagram illustrating the positional relationship among the functional component, the release agent, and the tire inner surface. FIG. 7 is a flowchart showing a method for manufacturing a pneumatic 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 portions are denoted by the same reference numerals, and description thereof is omitted.

(Composition of pneumatic tire)
With reference to FIG. 1, the structure of the pneumatic tire 10 which concerns on this embodiment is demonstrated.

  As shown in FIG. 1, the pneumatic tire 10 is used by being assembled in a rim hole 50. The inner space of the pneumatic tire 10 assembled in the rim hole 50 is filled with a gas such as air.

  A functional component 200 is attached to the back side of the tread 20 in contact with the road surface. Examples of the functional component 200 include a sensor that measures temperature, internal pressure, acceleration, and the like. The functional component 200 is not limited to a sensor, and may be a sponge, a sealant, a wireless communication device (wireless device), or the like.

  The functional component 200 is attached to the inner surface of the pneumatic tire 10, specifically, the tire inner surface 30 via the functional component mounting base 100. That is, the functional component mounting base 100 is a base for mounting the functional component 200 to the tire inner surface 30. In the present embodiment, the functional component 200 and the functional component mounting base 100 are described separately. However, the functional component 200 and the functional component mounting base 100 may be expressed as functional components.

  In addition, although the kind of pneumatic tire 10 is not specifically limited, in this embodiment, it is mainly mounted on automobiles such as passenger cars, trucks, and buses that travel on ordinary paved roads (general roads and highways). Assumption.

(Structure of functional parts and functional part mounting base)
Next, the structure of the functional component 200 and the functional component mounting base 100 will be described with reference to FIG.

  As shown in FIG. 2, the functional component 200 has the same shape as a button battery having a certain thickness, for example. Further, as shown in FIG. 2, the functional component mounting base 100 includes an enclosing wall portion 110, a ceiling portion 130, and a base portion 120. Further, the back side of the base portion 120 is an adhesive surface 140 that adheres to the tire inner surface 30.

  The bonding surface 140 may be formed of a mold molding member such as vulcanized rubber or plastic, or may be formed of a metal member. The adhesion surface 140 being formed of a metal member means that a part of the printed circuit board is exposed on the adhesion surface 140 or the wiring terminal of the metal member is exposed on the surface of the vulcanized rubber member. In addition, the wiring terminal of a metal member is aluminum, copper, gold | metal | money etc., for example.

  As shown in FIG. 3, the adhesive surface 140 is fixed to the tire inner surface 30 with an adhesive. However, as shown in FIG. 3, if a substance (such as a release agent 70 or an anti-aging agent) is attached to the bonding surface 140, the release agent 70 may reduce the adhesive strength of the adhesive. Thereby, there exists a possibility that the adhesive strength of the adhesion surface 140 and the tire inner surface 30 may fall.

  Therefore, in this embodiment, the release agent 70 attached to the adhesive surface 140 is appropriately removed using an infrared laser. This point will be described with reference to FIG.

  As shown in FIG. 4, an infrared absorbing material 150 is added to the bonding surface 140 before irradiating the infrared laser. The infrared absorbing material 150 in the present embodiment is, for example, carbon and absorbs infrared rays having a wavelength in the range of 1000 nm to 1100 nm. The infrared absorbing material 150 contains a material that reduces the reflectance of the infrared laser. The reflectance of the infrared laser reflected by the infrared absorbing material 150 may be 70% or less, and is not particularly limited. The reflectance of the infrared laser reflected by the infrared absorbing material 150 may be 30% or less.

  The addition of the infrared absorbing material 150 is not particularly limited. When the bonding surface 140 is formed of a vulcanized rubber member, the infrared absorbing material 150 may be unevenly distributed on the bonding surface 140. The uneven distribution of the infrared absorbing material 150 means that the infrared absorbing material 150 is applied to or adhered to the adhesive surface 140. Further, it may be bleed to the adhesive surface 140 at the time of molding, and the infrared absorbing material 150 may be included in the release agent 70. In the case where the bonding surface 140 is formed of a metal member, the infrared absorbing material 150 may be applied to or adhered to the bonding surface 140.

  When the infrared absorbing material 150 is irradiated with an infrared laser, the infrared laser absorbed by the infrared absorbing material 150 is converted into heat. This heat energy evaporates the release agent 70. Thereby, the release agent 70 is removed, and the adhesive strength between the adhesive surface 140 and the tire inner surface 30 is improved as shown in FIG.

  It has been described that the reflectance of the infrared laser reflected by the infrared absorbing material 150 may be 70% or less. The reason is that when the reflectance is greater than 70%, the reflected infrared laser is used as a laser irradiation device. This is because it returns with high power. Thereby, the irradiation part of a laser irradiation apparatus becomes easy to break down, the maintenance frequency in mass production increases, and efficiency becomes low. For example, when an infrared laser is applied to a metal member having a reflectance near 1000 nm and greater than 70%, the laser irradiation apparatus needs to be repaired at a rate of once every 1000 to 2000 times. If the reflectance is 70% or less, the number of repairs of the laser irradiation apparatus is reduced and the productivity is improved.

  In the above example, the release agent 70 attached to the adhesive surface 140 has been described. However, the release agent is not limited to the adhesive surface 140. As shown in FIG. 6A, a release agent 71 may adhere to the tire inner surface 30. The release agent 71 is applied to the inner surface in the vulcanization process and remains on the tire inner surface 30 after vulcanization. In the vulcanization step, the bladder is expanded and the inner surface of the unvulcanized tire is pressed. A release agent 71 is applied to the inner surface of the unvulcanized tire so that the bladder and the inner surface of the tire are not in close contact with each other when vulcanization is completed. As shown in FIG. 6A, the release agent 71 remains on the tire inner surface 30 after vulcanization. Note that the release agent 71 is, for example, silicon. The release agent 71 may reduce the adhesive strength between the functional component 200 and the tire inner surface 30.

  As shown in FIG. 6A, when the release agent 71 is attached to the installation area 80 where the functional component 200 is installed, the release agent 71 is removed by irradiating the tire inner surface 30 with an infrared laser. Specifically, an infrared laser is applied to a region 81 formed from the tire inner surface 30 toward the outer side in the tire radial direction. This area 81 is an area included in the installation area 80 where the functional component 200 is installed. The region 81 includes an infrared absorbing material.

  As shown in FIG. 6A, when the region 81 including the infrared absorbing material 160 is irradiated with an infrared laser, the infrared laser is absorbed by the tire inner surface 30 (region 81). The infrared laser absorbed by the tire inner surface 30 (region 81) is converted into heat. The release agent 71 is removed by this thermal energy. Thereby, as shown to FIG. 6B, the recessed part 90 from which the mold release agent 71 was removed is formed. Thereafter, as shown in FIG. 6C, the functional component 200 is installed in the recess 90. Thus, the adhesive strength between the functional component 200 and the tire inner surface 30 is improved by installing the functional component 200 in the recess 90 from which the release agent 71 has been removed.

  The infrared absorbing material 160 is, for example, carbon and absorbs infrared rays having a wavelength in the range of 1000 nm to 1100 nm. The infrared absorbing material 160 contains a material that reduces the reflectance of the infrared laser. The reflectance of the infrared laser reflected by the infrared absorbing material 160 may be 30% or less. When the reflectance is greater than 30%, the reflected infrared laser is irradiated to a region other than the region where the release agent 71 is removed. Thereby, regions other than the region from which the release agent 71 is removed may be damaged by heat, and the durability of the inner surface member may be lowered. Also, when the infrared laser is reflected, the absorbed infrared laser becomes relatively small. If relatively little infrared laser is absorbed, the thermal energy will be insufficient. Thereby, the mold release agent 71 is not sufficiently removed, and the adhesive strength between the functional component 200 and the tire inner surface 30 may be reduced. For the above reason, the reflectance may be 30% or less. Note that the release agent 71 may include an infrared absorbing material.

  Further, both the adhesive surface 140 and the tire inner surface 30 may be irradiated with an infrared laser. Thereby, the release agent 70 adhering to the adhesion surface 140 and the release agent 71 adhering to the tire inner surface 30 are removed, and the adhesive strength between the functional component 200 and the tire inner surface 30 is improved.

(Experimental result)
Next, experimental results regarding the reflectance of the infrared laser will be described.

  In the experiment, a release agent (comparative example) not including the infrared absorbing material 160 and a release agent 71 (example) including the infrared absorbing material 160 were used. The inventor measured the reflectance of the infrared laser by irradiating the two release agents with an infrared laser. In this experiment, the inventor measured the reflectance of an infrared laser by attaching a 1 mm condensing type reflection measuring unit to an ultraviolet-visible infrared spectrophotometer MV-3300 manufactured by JASCO Corporation.

(Comparative example)
As a release agent for the comparative example, mica containing no infrared absorbing material was used. The inventor applied a 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 on the release agent remaining on the tire after vulcanization, and measured the reflectance of the laser beam. The reflectance at a wavelength of 1000 nm to 1100 nm was 32 to 35%.

  When the inventor irradiates the release agent with an infrared laser having a wavelength of 1090 nm, a part of the reflected infrared laser hits the bead portion, and the tire drum durability is lowered. Moreover, when functional parts were installed on 30 tires of comparative examples and left at room temperature for 6 months, the functional parts were peeled off in one tire. Thus, the adhesive strength of the functional component was insufficient.

(Example)
As the release agent 71 of the example, black mica containing 10% of carbon as the infrared absorbing material 160 was used. The inventor applied the release agent 71 on the inner surface with a thick film of 50 μm or more and vulcanized the tire. The inventor irradiated an infrared laser to the release agent 71 remaining on the tire after vulcanization, and measured the reflectance of the infrared laser. The reflectance at a wavelength of 1000 nm to 1100 nm was 20 to 25%.

  When the inventor irradiates the release agent 71 with an infrared laser having a wavelength of 1090 nm, no decrease in the durability of the tire drum was confirmed. In addition, when functional parts were installed on 30 tires of the example and left at room temperature for 6 months, no tires from which the functional parts were peeled off were confirmed.

  From the above experimental results, if the reflectance of the infrared laser reflected by the infrared absorbing material 160 is 30% or less, the durability of the tire drum does not decrease, and the release agent 71 can be removed appropriately, and the functional component It can be seen that the bonding strength between the tire 200 and the tire inner surface 30 is improved.

  Next, with reference to the flowchart of FIG. 4, the manufacturing method of the pneumatic tire 10 which concerns on this embodiment is demonstrated.

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

  Next, in the vulcanization step S20, a release agent 71 is applied to the inner surface of the unvulcanized tire. This release agent 71 may contain an infrared absorbing material 160. In the case where the release agent 71 does not include the infrared absorbing material 160, a region 81 including the infrared absorbing material 160 may be formed from the inner surface toward the outer side in the tire radial direction in the unvulcanized tire. The bladder is inflated and the inner surface of the unvulcanized tire is pressed. Thereafter, the unvulcanized tire is vulcanized by a vulcanization mold. The release agent 71 remains on the tire inner surface 30 after vulcanization.

  Next, in the infrared absorbing substance adding step S30, the infrared absorbing substance 150 is added to the adhesive surface 140 of the functional component 200.

  Next, in the irradiation step S40 (first step), the adhesive surface 140 is irradiated with an infrared laser. The infrared laser absorbed by the infrared absorbing material 150 is converted into heat, and the release agent 70 is removed by this thermal energy. Further, an infrared laser is irradiated to the installation area 80 where the functional component 200 is installed. The infrared laser absorbed by the infrared absorbing material 160 is converted into heat, and the release agent 71 is removed by this thermal energy.

  Next, in the installation step S50 (second step), the functional component 200 is installed in the area where the release agent 71 has been removed. At this time, the release agent 70 attached to the adhesive surface 140 of the functional component 200 is also removed. Thereby, the adhesive strength between the functional component 200 and the tire inner surface 30 is improved.

(Function and effect)
In the pneumatic tire 10 according to the present embodiment, the functional component 200 can be provided on the tire inner surface 30. The functional component 200 has an adhesion surface 140 that adheres to the tire inner surface 30. The infrared absorbing material 150 is added to the bonding surface 140 and then the bonding surface 140 is irradiated with an infrared laser. The infrared laser absorbed by the infrared absorbing material 150 is converted into heat, and this thermal energy evaporates the material (mold release agent 70, anti-aging agent, etc.) adhering to the adhesive surface 140. Thereby, the mold release agent 70 is removed, and the adhesive strength between the adhesive surface 140 and the tire inner surface 30 is improved. Further, as a characteristic of the infrared absorbing material 150, the reflectance of infrared rays having a wavelength of 1000 nm to 1100 nm is 30% or less. Thereby, the reflected infrared laser is less likely to return to the laser irradiation device with high power. This reduces the number of repairs of the laser irradiation device and improves productivity.

  Although the embodiments of the present invention have been described as described above, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  For example, when an inner liner is provided on the tire inner surface 30, the inner liner may include an infrared absorbing material.

DESCRIPTION OF SYMBOLS 10 Pneumatic tire 20 Tread 30 Tire inner surface 50 Rim hole 70, 71 Release agent 80 Installation area 81 Area 90 Recess 100 Functional component mounting base 110 Surrounding wall part 120 Base part 130 Ceiling part 140 Adhesive surface 150, 160 Infrared absorbing substance 200 Function parts

Claims (3)

A tire manufacturing method capable of providing a functional component on the tire inner surface,
The functional component has an adhesion surface that adheres to the tire inner surface,
A first step of irradiating the adhesive surface with a laser;
A method for manufacturing a tire, comprising a second step of attaching the functional component to the tire inner surface after the first step. The adhesive surface is formed of a vulcanized rubber member,
Before the first step, the method further includes a step of adding an infrared absorbing material having an infrared reflectance of 30% or less having a wavelength of 1000 nm to 1100 nm to the adhesive surface,
2. The tire manufacturing method according to claim 1, wherein, in the first step, the laser is irradiated on the adhesive surface to which the infrared absorbing material is added. 3. The adhesive surface is formed of a metal member,
Before the first step, the method further includes a step of adding an infrared ray absorbing material having a wavelength of 1000 nm to 1100 nm with an infrared reflectance of 30% or less to the adhesive surface,
2. The tire manufacturing method according to claim 1, wherein, in the first step, the laser is irradiated on the adhesive surface to which the infrared absorbing material is added. 3.

Images