JP5865455B2 - tire - Google Patents

Description

  The present invention relates to a tire mounted on a rim, and particularly relates to a tire formed at least partially from a resin material.

Conventionally, pneumatic tires made of rubber, organic fiber materials, steel members, and the like are used in vehicles such as passenger cars.
In recent years, from the viewpoint of weight reduction, ease of molding, and ease of recycling, the use of resin materials, particularly thermoplastic resins and thermoplastic elastomers, as tire materials has been studied.
For example, Patent Document 1 and Patent Document 2 disclose a pneumatic tire formed using a thermoplastic polymer material.

JP 2003-104008 A Japanese Patent Laid-Open No. 03-143701

  A tire using a thermoplastic polymer material is easier to manufacture and lower in cost than a conventional rubber tire. However, in general, some thermoplastic polymer materials forming the tire skeleton easily change in properties due to the influence of the external environment on ultraviolet rays and humidity. For this reason, the importance of the weather resistance with respect to external environments, such as moisture resistance and light resistance, is large compared with the rubber which forms the conventional tire. In particular, when the tire skeleton is formed of a uniform thermoplastic polymer material, for example, when the tire is abused in a situation where moisture such as rainwater or muddy water is in contact, the tire skeleton is formed. It is assumed that the thermoplastic polymer material reacts to cause hydrolysis of the thermoplastic polymer. In addition, it is assumed that the thermoplastic polymer material forming the tire skeleton is deteriorated by ultraviolet rays and a small crack is generated, or a small crack called a so-called solvent crack is generated in the tire skeleton by an external salt content. Although the performance of the tire itself does not deteriorate immediately due to the occurrence of such hydrolysis or small cracks, it is desirable to replace the tire with the degree of occurrence as a guide. However, there is a problem that the property change of the tire material as described above, small cracks, and the like are difficult to distinguish with the naked eye. For this reason, it is desirable that a tire using a thermoplastic polymer material be provided with a means by which a user or the like can easily check the condition of the tire for weather resistance and can determine an accurate tire replacement time.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a tire that is formed using a resin material and that can visually confirm the state of the resin material that forms the tire frame. is there.

(1) The tire of the present invention has a tire skeleton of the cyclic formed of a resin material, visually in accordance with the chemical effects from the surrounding environment of the tire frame member to at least a portion of the tire frame member An indicator area that is irreversibly changed is provided.

  The tire of the present invention has an annular tire skeleton formed of a resin material. Here, the “resin” is a concept including a thermoplastic resin (including a thermoplastic elastomer) and a thermosetting resin, and does not include vulcanized rubber. In the tire of the present invention, since the tire frame is formed of a resin material, the vulcanization process that is an essential process in the conventional rubber tire is not essential. For example, the tire frame is molded by injection molding or the like. be able to. For this reason, simplification of a manufacturing process, time reduction, cost reduction, etc. can be aimed at. In addition, a tire frame formed using a resin material has an advantage that the weight is light because the structure of the tire frame is generally simpler than that of a conventional rubber tire. For this reason, the wear resistance and rolling resistance of the tire can be improved.

Also, the tire of the present invention, the tire frame body, visually changing indicator area is provided in accordance with the chemical effects of the surrounding environment of the tire frame member. Here, “chemical or physical influence from the surrounding environment of the tire frame” means a chemical or physical influence from the surrounding environment that the tire frame can receive. Examples of the chemical influence from the surrounding environment that can be received by the tire frame body include an influence by a chemical reaction that can be received from factors such as ultraviolet rays, moisture, salt, chemicals (acid, alkali, oil, various solvents), and the like. . Moreover, the physical influence which the said tire frame body can receive includes the influence by the physical impact from the tire exterior, etc.

  Furthermore, “the indicator region visually changes in response to a chemical or physical influence from the surrounding environment of the tire frame” means that the indicator region is “chemical or from the surrounding environment of the tire frame”. By directly receiving “physical effect” or indirectly from the tire frame, it means visually changing its appearance. “Visually changing the appearance” means, for example, changing the color (hue, saturation, brightness, density, etc.) of the indicator region by color development, or changing the shape of the indicator region.

  As described above, the indicator region visually changes in accordance with the chemical or physical influence from the surrounding environment of the tire frame body, so that the chemical or physical influence received by the tire from the surrounding environment is visually recognized. Can be expressed as For this reason, it is possible to visually determine the situation such as the deterioration state of the tire from the outside of the tire.

(2) The tire of the present invention, the indicator region may be configured to visually changes depending on the chemical changes in the tire frame body. The visual change may be a visually irreversible change corresponding to a chemical change caused by at least one of moisture, salt, and chemicals of the tire frame body.

Here, "chemical or physical change of the tire frame body" means that the tire frame body itself changes chemically or physically by chemical influence from the surrounding environment of the tire frame body above . Examples of the chemical change of the tire frame body include a property change (deterioration) of the resin of the tire frame body due to hydrolysis and a property change (deterioration) of the resin due to ultraviolet rays. Moreover, as a physical change of a tire frame body, the crack (crack) in a tire frame body etc. are mentioned, for example.

  Further, “the indicator region visually changes according to a chemical or physical change of the tire frame body” means that the indicator region corresponds to the “chemical or physical change of the tire frame body. "Visually changing" from the tire frame means visually changing its appearance as described above.

  As described above, the indicator region is configured to visually change in accordance with the chemical or physical change of the tire frame body, so that the state of the chemical or physical change of the tire frame body itself can be determined. Can be confirmed visually.

(3) The tire of the present invention can be configured such that the indicator region is visually irreversibly changed by the coloring means.

  By using color developing means for the indicator region, the indicator region can be color-sensitively changed (for example, hue, saturation, and brightness are changed). Thereby, the condition of the resin material forming the tire frame body can be easily confirmed from the outside by the difference in color.

(4) In the tire of the present invention, cobalt chloride or a coloring agent-containing capsule can be used as the coloring means.

(5) The tire of the present invention can be configured such that the resin material includes a thermoplastic resin. Here, the “thermoplastic resin” means a resin having thermoplasticity, and does not include conventional vulcanized rubber such as natural rubber and synthetic rubber.

(6) The tire of the present invention can be configured such that the resin material includes a thermoplastic elastomer. Here, the “thermoplastic elastomer” means a copolymer having a crystalline hard segment having a high melting point or a hard segment having a high cohesion and a non-crystalline polymer having a low glass transition temperature. It means a thermoplastic resin made of a polymer.

  As described above, according to the present invention, it is possible to provide a tire that is formed using a resin material and that can visually confirm the state of the resin material that forms the tire frame.

It is explanatory drawing which shows the aspect of an indicator area | region. It is another explanatory drawing which shows the aspect of an indicator area | region. It is another explanatory drawing which shows the aspect of an indicator area | region. It is explanatory drawing for demonstrating the coloring mechanism of an indicator area | region. (A) is a perspective view showing a section of a part of a tire concerning one embodiment of the present invention, and (B) is a sectional view of a bead part attached to a rim. It is sectional drawing along the tire rotating shaft which shows the state by which the reinforcement cord was embed | buried under the crown part of the tire case of the tire of 1st Embodiment. It is explanatory drawing for demonstrating the operation | movement which sets a tire half body to the tire support part of a molding machine. (A) It is a perspective view which shows the state where the protrusion amount of the cylinder rod of the tire support part of a molding machine is the smallest. (B) It is a perspective view which shows the state with the largest protrusion amount of the cylinder rod of the tire support part of a molding machine. It is explanatory drawing for demonstrating the operation | movement which adheres the thermoplastic resin material for welding to the junction part of a tire half body using an extruder. It is explanatory drawing for demonstrating the operation | movement which embeds a reinforcement cord in the crown part of a tire case using a cord heating apparatus and rollers. It is a perspective view of the tire support part which supported the tire half and the tire inner surface support ring. It is explanatory drawing for demonstrating the operation | movement which heats the part by which the reinforcement cord is embed | buried with a warm air apparatus in the manufacturing method of the tire of other embodiment. (A) is sectional drawing along the tire width direction of the tire which concerns on one Embodiment of this invention. (B) is an enlarged view of a cross section along a tire width direction of a bead portion in a state where a rim is fitted to a tire. It is sectional drawing along the tire width direction which shows the circumference | surroundings of the reinforcement layer of the tire of 2nd Embodiment. It is a perspective view which shows the state which is performing the roughening process on the outer peripheral surface of a tire case using a blasting apparatus. It is the enlarged view to which the outer peripheral surface of the tire case which is performing the roughening process was expanded. It is sectional drawing along the tire width direction of the tire of other embodiment. It is explanatory drawing for demonstrating the operation | movement which covers the covering cord member wound and joined to the crown part of the tire case of other embodiment with the thermoplastic resin material for a covering. It is a perspective view which shows the state which is performing the roughening process on the outer peripheral surface of the tire case of other embodiment. It is explanatory drawing for demonstrating the operation | movement which covers the coating | coated cord member wound and joined to the crown part of the tire case of other embodiment with a welding sheet | seat.

As described above, the tire of the present invention has an annular tire skeleton formed of a resin material, and at least part of the tire skeleton has a chemical or physical influence from the surrounding environment of the tire skeleton. An indicator region that changes visually in response to is provided.
Hereinafter, the indicator region, its mode, and the resin material constituting the tire skeleton in the present invention will be described, and then specific embodiments of the tire of the present invention will be described with reference to the drawings.

[Indicator area]
First, the function of the indicator area will be described. The indicator region changes visually according to chemical or physical influences from the surrounding environment of the tire frame. As described above, “chemical or physical influence from the surrounding environment of the tire frame” means a chemical or physical influence from the surrounding environment that the tire frame can receive. In addition, as a chemical influence from the surrounding environment that the tire frame body can receive, for example, there is an influence due to a chemical reaction that can be received from factors such as ultraviolet rays, moisture, salt, chemicals (acid, alkali, oil, various solvents) and the like. Can be mentioned. Furthermore, examples of the physical influence that the tire frame body can receive include an influence caused by a physical impact from the outside of the tire.

  The indicator region receives the “chemical or physical influence from the surrounding environment of the tire frame body” directly or indirectly from the tire frame body, thereby visually changing the appearance thereof. Here, “visually changing the appearance” means, for example, changing the color of the indicator region (hue, saturation, brightness, density, etc.) by color development, or changing the shape of the indicator region. .

  As will be described later, the indicator region is formed by applying or adhering a material constituting the indicator region to the outer peripheral surface of the resin material forming the tire frame body, or forming the indicator region on a part or all of the tire frame body. It can be formed by mixing materials.

  When the indicator region directly receives chemical or physical influence from the surrounding environment of the tire frame, the chemical or physical influence from the surrounding environment of the tire frame is directly related to the material constituting the indicator region. It means a case where the indicator region is configured to change visually by receiving.

Specifically, for example, when the moisture absorption degree of the tire is configured so as to be visible in the indicator region, a coloring means that changes color due to moisture absorption (for example, cobalt chloride) is used as a resin material for forming the tire skeleton. The indicator region can be formed by mixing or applying to the tire surface a resin composition containing the same resin material as the resin material and the coloring means. For example, cobalt (II) chloride becomes anhydrate and exhibits a blue color when coordinated water is lost, but exhibits a pink color due to moisture absorption.
In this case, the coloring means (cobalt chloride) constituting the indicator region changes its color from blue to pink by directly receiving moisture in the tire frame, that is, chemical influence from the surrounding environment of the tire frame. Therefore, the indicator area is visually changed.

  Further, in the case where the indicator region is configured to make it possible to visually recognize how much the tire is exposed to ultraviolet rays, a coloring means (for example, an ultraviolet curable capsule containing a coloring agent) whose properties are changed by irradiation with ultraviolet rays is provided. The indicator region can be formed by mixing with a resin material forming a tire skeleton or by applying or adhering to a tire surface. When the ultraviolet curable capsule is used, for example, the ultraviolet curable capsule absorbs a certain amount of ultraviolet rays and the capsule wall is cured. When the capsule wall is hardened, the capsule wall is easily broken by an external impact. For this reason, when the ultraviolet ray curable capsule absorbs a certain amount or more of ultraviolet rays, the capsule wall is easily broken and the encapsulated color former flows out. The color of the indicator region can be changed by the outflow of the color former. In this case, the color forming means (color forming agent-containing UV curable capsule) constituting the indicator region directly receives the same amount of ultraviolet light as that received by the tire frame body, that is, the chemical influence from the surrounding environment of the tire frame body. As a result, the indicator region is visually changed.

  On the other hand, when the indicator region receives a chemical or physical influence from the surrounding environment of the tire frame body indirectly from the tire frame body, the material constituting the indicator region is a chemical or physical influence from the surrounding environment. This means that the tire frame is configured to change visually according to the chemical or physical change of the tire frame. That is, the tire skeleton itself changes chemically due to the chemical or physical influence from the surrounding environment described above (for example, the property change (deterioration) of the resin of the tire skeleton due to hydrolysis or the property change of the resin due to ultraviolet rays). ) Or physically change (eg, cracks), the indicator region can be configured such that the appearance of the material that makes up the indicator region changes.

Specifically, in the case where the degree of occurrence of cracks in the tire frame is configured to be visible in the indicator region, a color former-containing capsule can be used as the color development means. In this case, for example, the indicator region can be formed by mixing the color former-containing capsule with a resin material forming a tire skeleton, or by applying or attaching the color former-containing capsule to the tire surface.
At this time, if a crack occurs in the indicator region of the tire frame body, the color former-containing capsule is broken by the crack, and the internal color former flows out. The color of the indicator region can be changed by the outflow of the color former. For this reason, the generation | occurrence | production state of the crack of a tire frame body can be visually confirmed from the tire exterior through an indicator area | region. That is, the material constituting the indicator region (coloring agent-containing capsule) receives the chemical or physical influence from the surrounding environment of the tire frame body indirectly as a physical change of the tire frame body called a crack, thereby The area will be changed visually.

  Next, an aspect of the indicator area will be described with reference to the drawings. 1-3 is explanatory drawing which shows the aspect of an indicator area | region. In the present invention, the shape, position, and size of the indicator region are not particularly limited. For example, as shown in FIG. 1, the indicator region 2A can be provided continuously along the circumferential direction of the tire case half 17A. Moreover, as shown in FIG. 2, you may form the indicator area | region 2B in a part of side surface of the tire case half body 17A. Furthermore, as shown in FIG. 3, you may comprise so that all the side surfaces of the tire case half body 17A may become the indicator area | region 2C. In these cases, for example, the color in the indicator regions 2A to 2C is, for example, black to yellow according to the degree of moisture absorption of the tire case half 17A, the amount of ultraviolet absorption, or the occurrence of cracks in the tire case half 17A, or It changes from blue to red. The criteria for determining the degree of change of these indicator areas vary depending on the desired mode. For example, the color in the indicator area 2B changes to yellow, and the density of the color becomes high. It is possible to arbitrarily set the tire replacement time.

  The method for forming the indicator region is not particularly limited, and various methods can be used. For example, a resin material constituting the tire case half 17A is mixed with a coloring means that visually changes in accordance with a physical change of the tire case, and the tire case is injection molded using the resin material. At this time, the resin material mixed with the coloring means may be injected together to form the tire case half body 17A so that the pattern of the indicator region as shown in FIGS. 1 and 3 is formed on the surface.

  Also, the indicator region can be obtained by separately preparing the color developing means or separately preparing a resin composition mixed with the resin material constituting the tire case, and applying it in a pattern as shown in FIGS. Can also be formed on the tire case half 17A. Furthermore, the said resin composition etc. may be processed into a film form, and the said resin composition may be affixed on the tire case half body 17A in the pattern shape as shown in FIGS. 1-3, and an indicator area | region may be formed.

When the indicator region is continuously formed in the circumferential direction of the tire case half body 17A as shown in FIG. 1, for example, in a case where the occurrence of cracks in the tire case can be visually recognized by the indicator region, the tire The indicator region is preferably formed in a region where cracks are likely to occur, such as the most bent region of the case.
The indicator region does not need to be formed in a pattern, and the tire frame is formed using a resin material mixed (dispersed) with the coloring means, and the indicator region is provided on the entire surface of the tire frame. It can also be.

  Next, the configuration of the indicator area will be described. The indicator region is configured to visually change its appearance in response to a chemical or physical influence from the surrounding environment of the tire frame or a chemical or physical change of the tire frame. That is, the indicator region can be configured to change the color of the indicator region (hue, saturation, brightness, density, etc.) or change the shape of the indicator region according to these factors. When the color of the indicator region is changed by color development, the color development means can be used as described above. Moreover, when changing the shape of an indicator area | region, the microcapsule which includes resin hardened | cured with the water | moisture content in air can be used, for example. In this case, for example, when the microcapsule is broken due to a crack in the tire frame and the curable resin flows out to the tire surface, it can be hardened in the indicator region to form a minute bulge.

  Examples of the coloring means include materials that change color (saturation, brightness, hue) by absorption of moisture, ultraviolet rays, salt, chemicals (acids, alkalis, oils, various solvents), and coloring agents due to impacts and cracks. An outflowing color former-containing capsule or an ultraviolet curable capsule containing the color former can be used.

  The material whose color is changed by absorption of moisture, ultraviolet rays, salt, chemicals (acid, alkali, oil, various solvents) is not particularly limited, but is used for, for example, a wetness detection material. Examples of the compound include cobalt chloride. The compound can be used, for example, by mixing with a resin material forming a tire skeleton. Specifically, the above-described cobalt chloride or the like is mixed in the entire tire frame body, a region containing these compounds is formed in a part of the tire frame body, or a resin material that separately forms the tire frame body and these compounds Can be prepared and applied, or a film made of the resin composition can be attached to the tire frame. Moreover, it is preferable that the said compound is used in the aspect which raise | generates an irreversible reaction.

As described above, cobalt chloride can be used when the degree of hydrolysis of the tire frame body can be visually recognized by the indicator region. When cobalt chloride is used by being mixed with the resin material forming the tire frame body, from the viewpoint of improving visibility, it is preferably 1% by mass with respect to the total amount of the resin material forming the tire frame body in the indicator region. It is preferable to mix cobalt chloride in an amount of about 0.5 mass%. In addition, when cobalt chloride is applied to the tire frame body, or is applied to the tire frame body in the form of a film, cobalt chloride may be used alone, but the same or different from the resin material constituting the tire frame body. It is preferable to use a resin composition containing the above kind of resin and cobalt chloride, and it is particularly preferred to use a resin material containing the same kind of resin as the resin material and cobalt chloride.
However, the content of the cobalt chloride is preferably determined so that the degree to which the tire frame body is hydrolyzed and deteriorated due to moisture absorption can be confirmed. For this reason, for example, when the moisture absorption to such an extent that the hydrolysis rate of the resin material forming the tire frame body is estimated to be equal to or higher than a certain threshold value is set, the indicator region changes its color, It can be configured such that the color density in the indicator region gradually changes (for example, becomes darker) according to the decomposition amount (moisture absorption amount).

  Moreover, it is preferable that the said cobalt chloride is used in the aspect which raise | generates an irreversible reaction. As said cobalt chloride, what is utilized for the well-known water wet detection seal | sticker etc. can be selected suitably, for example. Moreover, as said cobalt chloride, a commercial item can be utilized, for example, "Paper Indicator" by Toyoda Chemical Co., Ltd. may be used.

  On the other hand, in the case where the degree of occurrence of cracks in the tire skeleton is made visible by the indicator region as described above, a color former-containing capsule that allows the color former contained by the capsule wall to flow out is used. Can do. The color former-containing capsule is not particularly limited as long as the capsule wall has a strength such that the capsule wall is broken by the progress of cracks generated in the tire frame and does not break when the tire frame is molded. be able to. Although the material which comprises a capsule wall in particular is not ask | required, Glass (silicon compound), a thermosetting resin (an epoxy resin, a phenol resin) etc. can be used, for example. The color former preferably uses a different color from the tire skeleton from the viewpoint of visibility. For example, when the tire frame is formed of black, white, red, blue, yellow, green, etc. other than black are preferable, but there is no particular limitation as long as the color is conspicuous on a black background. Further, a fluorescent color or the like can also be used. As the color former, a liquid such as a known dye or pigment dispersion can be used as long as it flows out when the capsule wall is broken. Further, the color former may be a solid (for example, a powder), and is preferably one that is difficult to be altered (solidified, increased in viscosity) depending on the temperature when the tire is added. As the color former, for example, “Picarico” manufactured by Chemtech can be used.

  The size of the color former-containing capsule is not particularly limited, but it is preferable to use a capsule having a size of 1 mm or less, for example. The content of the color former-containing capsule is not particularly limited as long as the color former surely flows out to the outer surface of the tire when a crack occurs in the tire frame and does not reduce the strength of the tire. Further, when the color former-containing capsule is applied to a tire skeleton body or is separately attached to the tire skeleton body in the form of a film, the color former-containing capsule may be used alone, but the resin constituting the tire skeleton body It is preferable to use a resin composition containing the same kind of resin as the material or another kind of resin and a color former-containing capsule, and it is particularly preferred to use a resin material containing the same kind of resin as the resin material and a color former-containing capsule.

  A known method can be appropriately employed for producing the color former-containing capsule. Moreover, the said color former containing capsule can utilize the thing of a commercial item.

  As described above, in the case where the deterioration of the resin material constituting the tire skeleton body can be visually recognized by the indicator region, the capsule wall is hardened by absorbing the ultraviolet rays and the impact resistance is weakened. It is possible to use a color developing agent-containing UV curable capsule that has a color developing agent that flows out due to cracks in the capsule wall. The color former-containing capsule is not particularly limited as long as the capsule wall has a strength such that the capsule wall is broken by the progress of cracks generated in the tire frame and does not break when the tire frame is molded. be able to. In particular, any material can be used as long as it has ultraviolet curability constituting the capsule wall. The color former can be the same as the color former-containing capsule.

  The size of the color former-containing ultraviolet curable capsule is not particularly limited, but it is preferable to use a capsule having a size of 1 mm or less, for example. Further, the content of the color former-containing UV curable capsule is limited as long as the color former surely flows out to the outer surface of the tire when a crack occurs in the tire frame and does not reduce the strength of the tire. Absent. Further, when the color former-containing ultraviolet curable capsule is applied to a tire skeleton body or a film form and separately attached to the tire skeleton body, the color former-containing capsule may be used alone. It is preferable to use a resin composition containing the same or different type of resin material as the constituent resin and a color former-containing ultraviolet curable capsule, and includes the same kind of resin as the resin material and the color former-containing ultraviolet curable capsule. It is particularly preferable to use a resin material.

  A known method can be appropriately employed for producing the color former-containing ultraviolet curable capsule. Moreover, the said color former containing ultraviolet curable capsule can utilize a commercial item.

  Next, an example of the color development mechanism of the indicator region configured to change the color in the region by the occurrence of a crack using the color former-containing capsule will be described with reference to the drawings. FIG. 4 is an explanatory diagram for explaining the coloring mechanism of the indicator region.

  In FIG. 4, the tire case 17 is provided with an indicator region 2C as shown in FIG. Further, the color former layer 4 is embedded in the tire case 17. The color former layer 4 is continuously provided along the circumferential direction of the tire case 17, and innumerable microcapsules 6 containing the color former 8 (for example, a yellow color former) are dispersed. The color former layer 4 is formed by, for example, injecting a resin composition in which the microcapsules 6 are dispersed in a resin material constituting the tire case 17 when the tire case 17 is formed by injection molding. It can be molded so as to be embedded in the case 17 integrally.

  As shown in FIG. 4, when the crack 5 is generated in the tire case 17, the microcapsule 6 in the crack 5 is broken along with the progress. When the microcapsule 6 is broken, the encapsulated coloring agent 8 flows out of the capsule. Subsequently, the color former 8 that has flowed out of the capsule flows out to the outer surface of the side surface of the tire case 17 through the crack 5. The outer surface of the tire case 17 from which the color former 8 has flowed forms an indicator region 2C. For this reason, when the color former 8 flows out to the outer surface of the tire case 17 due to the occurrence of a crack, the inside of the indicator region 2C can be changed to yellow. Thereby, the user etc. can visually confirm generation | occurrence | production of the crack in the tire case 17 easily.

[Resin material]
Next, the resin material forming the tire frame will be described. Here, the “resin” is a concept including a thermoplastic resin (including a thermoplastic elastomer) and a thermosetting resin, and does not include vulcanized rubber.
Examples of the thermosetting resin include phenol resin, urea resin, melamine resin, epoxy resin, polyamide resin, and polyester resin.
Examples of the thermoplastic resin include urethane resin, olefin resin, vinyl chloride resin, polyamide resin, and polyester resin.

The thermoplastic elastomer is generally made of a copolymer having a crystalline hard segment having a high melting point or a hard segment having a high cohesion and a non-crystalline polymer having a low glass transition temperature. Is a thermoplastic resin material. Examples of the thermoplastic elastomer include polyamide-based thermoplastic elastomer (TPA), polyester-based thermoplastic elastomer (TPC), polyolefin-based thermoplastic elastomer (TPO), and polystyrene-based thermoplastic elastomer (specified in JIS K6418: 2007). TPS), polyurethane-based thermoplastic elastomer (TPU), crosslinked thermoplastic rubber (TPV), or other thermoplastic elastomer (TPZ). In consideration of elasticity required at the time of traveling, moldability at the time of manufacture, and the like, the tire frame body preferably uses a thermoplastic resin as the resin material, and more preferably uses a thermoplastic elastomer.
In the following resin materials, the same type refers to forms such as ester groups and styrene groups.

-Polyamide thermoplastic elastomer-
The polyamide-based thermoplastic elastomer is a thermoplastic resin material comprising a copolymer having a crystalline polymer having a high melting point and a non-crystalline polymer having a low glass transition temperature. It means that having an amide bond (—CONH—) in the main chain of the polymer constituting the hard segment. Examples of the polyamide-based thermoplastic elastomer include an amide-based thermoplastic elastomer (TPA) defined in JIS K6418: 2007, a polyamide-based elastomer described in JP-A-2004-346273, and the like.

  The polyamide-based thermoplastic elastomer constitutes a hard segment having a high melting point and at least a polyamide being crystalline, and a soft segment having a low glass transition temperature and other polymers (for example, polyester or polyether). Materials. The polyamide thermoplastic elastomer may use a chain extender such as dicarboxylic acid in addition to the hard segment and the soft segment. Examples of the polyamide that forms the hard segment include polyamides produced from monomers represented by the following general formula (1) or general formula (2).

General formula (1)



[In General Formula (1), R ¹ represents a molecular chain of a hydrocarbon having 2 to 20 carbon atoms or an alkylene group having 2 to 20 carbon atoms. ]

General formula (2)


[In General Formula (2), R ² represents a molecular chain of a hydrocarbon having 3 to 20 carbon atoms or an alkylene group having 3 to 20 carbon atoms. ]

In general formula (1), R ¹ is preferably a hydrocarbon chain having 3 to 18 carbon atoms or an alkylene group having 3 to 18 carbon atoms, and a hydrocarbon molecular chain having 4 to 15 carbon atoms or 4 carbon atoms. To 15 alkylene groups are more preferable, and hydrocarbon chains having 10 to 15 carbon atoms or alkylene groups having 10 to 15 carbon atoms are particularly preferable. In general formula (2), R ² is preferably a hydrocarbon molecular chain having 3 to 18 carbon atoms or an alkylene group having 3 to 18 carbon atoms, and a molecular chain or carbon having 4 to 15 carbon atoms. An alkylene group having 4 to 15 carbon atoms is more preferable, and a molecular chain of a hydrocarbon having 10 to 15 carbon atoms or an alkylene group having 10 to 15 carbon atoms is particularly preferable.
Examples of the monomer represented by the general formula (1) or the general formula (2) include ω-aminocarboxylic acid and lactam. Examples of the polyamide forming the hard segment include polycondensates of these ω-aminocarboxylic acids and lactams, and co-condensation polymers of diamines and dicarboxylic acids.

Examples of the ω-aminocarboxylic acid include 6-aminocaproic acid, 7-aminoheptanoic acid, 8-aminooctanoic acid, 10-aminocapric acid, 11-aminoundecanoic acid, and 12-aminododecanoic acid. And aliphatic ω-aminocarboxylic acid. Moreover, as a lactam, C5-C20 aliphatic lactams, such as lauryl lactam, (epsilon) -caprolactam, udecan lactam, (omega) -enantolactam, 2-pyrrolidone, etc. can be mentioned.
Examples of the diamine include ethylenediamine, trimethylenediamine, tetramethylenediamine, hexamethylenediamine, heptamethylenediamine, octamethylenediamine, nonamethylenediamine, decamethylenediamine, undecamethylenediamine, dodecamethylenediamine, 2,2, Examples thereof include diamine compounds such as aliphatic diamines having 2 to 20 carbon atoms such as 4-trimethylhexamethylenediamine, 2,4,4-trimethylhexamethylenediamine, 3-methylpentamethylenediamine, and metaxylenediamine. Further, the dicarboxylic acid can be represented by HOOC- (R ³ ) m-COOH (R ³ : a hydrocarbon molecular chain having 3 to 20 carbon atoms, m: 0 or 1). For example, oxalic acid, succinic acid And aliphatic dicarboxylic acids having 2 to 20 carbon atoms such as glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid and dodecanedioic acid.
As the polyamide forming the hard segment, a polyamide obtained by ring-opening polycondensation of lauryl lactam, ε-caprolactam or udecan lactam can be preferably used.

Examples of the polymer that forms the soft segment include polyesters and polyethers, such as polyethylene glycol, propylene glycol, polytetramethylene ether glycol, ABA type triblock polyether, and the like. A single compound or two or more compounds can be used. Moreover, polyether diamine etc. which are obtained by making animonia etc. react with the terminal of polyether can be used.
Here, the “ABA type triblock polyether” means a polyether represented by the following general formula (3).

General formula (3)


[In general formula (3), x and z represent the integer of 1-20. y represents an integer of 4 to 50. ]

  In the general formula (3), x and z are each preferably an integer of 1 to 18, more preferably an integer of 1 to 16, particularly preferably an integer of 1 to 14, and most preferably an integer of 1 to 12. . In the general formula (3), each of y is preferably an integer of 5 to 45, more preferably an integer of 6 to 40, particularly preferably an integer of 7 to 35, and most preferably an integer of 8 to 30. .

  Examples of the combination of the hard segment and the soft segment include the combinations of the hard segment and the soft segment mentioned above. Among these, lauryl lactam ring-opening polycondensate / polyethylene glycol combination, lauryl lactam ring-opening polycondensate / polypropylene glycol combination, lauryl lactam ring-opening polycondensate / polytetramethylene ether glycol combination, lauryl lactam The ring-opening polycondensate / ABA triblock polyether combination is preferred, and the lauryl lactam ring-opening polycondensate / ABA triblock polyether combination is particularly preferred.

  The number average molecular weight of the polymer (polyamide) constituting the hard segment is preferably 300 to 15000 from the viewpoint of melt moldability. Moreover, as a number average molecular weight of the polymer which comprises the said soft segment, 200-6000 are preferable from a viewpoint of toughness and low temperature flexibility. Furthermore, the mass ratio (x: y) to the hard segment (x) and the soft segment (y) is preferably 50:50 to 90:10, more preferably 50:50 to 80:20, from the viewpoint of moldability. preferable.

  The polyamide-based thermoplastic elastomer can be synthesized by copolymerizing the polymer that forms the hard segment and the polymer that forms the soft segment by a known method.

  Examples of the polyamide-based thermoplastic elastomer include “UBESTA XPA” series (for example, XPA9063X1, XPA9055X1, XPA9048X2, XPA9048X1, XPA9040X1, XPA9040X2, etc.) of Ube Industries, Ltd. “Vestamide” series (for example, E40-S3, E47-S1, E47-S3, E55-S1, E55-S3, EX9200, E50-R2) and the like can be used.

-Polyurethane thermoplastic elastomer-
The polyurethane-based thermoplastic elastomer is a material in which at least polyurethane forms a hard segment in which pseudo-crosslinking is formed by physical aggregation, and other polymers are amorphous and have a soft segment having a low glass transition temperature. For example, it can be represented as a copolymer containing a soft segment containing a unit structure represented by the following formula A and a hard segment containing a unit structure represented by the following formula B.

[In the above formula, P represents a long-chain aliphatic polyether or a long-chain aliphatic polyester. R represents an aliphatic hydrocarbon, an alicyclic hydrocarbon, or an aromatic hydrocarbon. P ′ represents a short-chain aliphatic hydrocarbon, alicyclic hydrocarbon, or aromatic hydrocarbon. ]

In the formula A, as the long-chain aliphatic polyether and long-chain aliphatic polyester represented by P, for example, those having a molecular weight of 500 to 5000 can be used. The P is derived from a diol compound containing a long-chain aliphatic polyether represented by the P and a long-chain aliphatic polyester. Such diol compounds include, for example, polyethylene glycol, propylene glycol, polytetramethylene ether glycol, poly (butylene adipate) diol, poly-ε-caprolactone diol, poly (hexamethylene) having a molecular weight within the above range. Carbonate) diol, the ABA type triblock polyether, and the like.
These may be used alone or in combination of two or more.

In Formula A and Formula B, R is derived from a diisocyanate compound containing an aliphatic hydrocarbon, alicyclic hydrocarbon, or aromatic hydrocarbon represented by R. Examples of the aliphatic diisocyanate compound containing the aliphatic hydrocarbon represented by R include 1,2-ethylene diisocyanate, 1,3-propylene diisocyanate, 1,4-butane diisocyanate, and 1,6-hexamethylene diisocyanate. Etc.
Examples of the diisocyanate compound containing the alicyclic hydrocarbon represented by R include 1,4-cyclohexane diisocyanate and 4,4-cyclohexane diisocyanate. Furthermore, examples of the aromatic diisocyanate compound containing the aromatic hydrocarbon represented by R include 4,4′-diphenylmethane diisocyanate and tolylene diisocyanate.
These may be used alone or in combination of two or more.

In the formula B, as the short chain aliphatic hydrocarbon, alicyclic hydrocarbon, or aromatic hydrocarbon represented by P ′, for example, those having a molecular weight of less than 500 can be used. The P ′ is derived from a diol compound containing a short chain aliphatic hydrocarbon, alicyclic hydrocarbon or aromatic hydrocarbon represented by the P ′. Examples of the aliphatic diol compound containing a short-chain aliphatic hydrocarbon represented by P ′ include glycol and polyalkylene glycol, such as ethylene glycol, propylene glycol, trimethylene glycol, 1,4-butanediol, Examples include 1,3-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol and 1,10-decanediol. It is done.
Examples of the alicyclic diol compound containing the alicyclic hydrocarbon represented by P ′ include cyclopentane-1,2-diol, cyclohexane-1,2-diol, and cyclohexane-1,3-diol. , Cyclohexane-1,4-diol, cyclohexane-1,4-dimethanol and the like.
Furthermore, examples of the aromatic diol compound containing an aromatic hydrocarbon represented by P ′ include hydroquinone, resorcin, chlorohydroquinone, bromohydroquinone, methylhydroquinone, phenylhydroquinone, methoxyhydroquinone, phenoxyhydroquinone, 4,4 ′. -Dihydroxybiphenyl, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxydiphenyl sulfide, 4,4'-dihydroxydiphenyl sulfone, 4,4'-dihydroxybenzophenone, 4,4'-dihydroxydiphenylmethane, bisphenol A, 1 , 1-di (4-hydroxyphenyl) cyclohexane, 1,2-bis (4-hydroxyphenoxy) ethane, 1,4-dihydroxynaphthalene, 2,6-dihydroxynaphthalene and the like. The
These may be used alone or in combination of two or more.

The number average molecular weight of the polymer (polyurethane) constituting the hard segment is preferably 300 to 1500 from the viewpoint of melt moldability. In addition, the number average molecular weight of the polymer constituting the soft segment is preferably 500 to 20000, more preferably 500 to 5000, and particularly preferably 500 to 5000, from the viewpoints of flexibility and thermal stability of the polyurethane-based thermoplastic elastomer. 3000. The mass ratio (x: y) to the hard segment (x) and the soft segment (y) is preferably 15:85 to 90:10, more preferably 30:70 to 90:10, from the viewpoint of moldability. preferable.
The polyurethane-based thermoplastic elastomer can be synthesized by copolymerizing the polymer that forms the hard segment and the polymer that forms the soft segment by a known method. As the polyurethane-based thermoplastic elastomer, for example, thermoplastic polyurethane described in JP-A-5-331256 can be used.
Specific examples of the polyurethane thermoplastic elastomer include tolylene diisocyanate (TDI) / polyester polyol copolymer, TDI / polyether polyol copolymer, TDI / caprolactone polyol copolymer, and TDI / polycarbonate. Polyol copolymer, 4,4'-diphenylmethane diisocyanate (MDI) / polyester polyol copolymer, MDI / polyether polyol copolymer, MDI / caprolactone polyol copolymer, MDI / polycarbonate polyol copolymer TDI and polyester polyol, TDI and polyether polyol, MDI and polyester polyol, and MDI and polyether polyol are more preferable.

  Examples of the polyurethane-based thermoplastic elastomer include, for example, commercially available “Elastollan” series (for example, ET680, ET880, ET690, ET890, etc.) manufactured by BASF, and “Clamiron U” series (manufactured by Kuraray Co., Ltd.). For example, 2000 series, 3000 series, 8000 series, 9000 series, “Milactolan” series (for example, XN-2001, XN-2004, P390RSUP, P480RSUI, P26MRNAT, E490, E590, P890) manufactured by Japan Miraclan Co., Ltd. Can be used.

-Polystyrene thermoplastic elastomer-
In the polystyrene-based thermoplastic elastomer, at least polystyrene constitutes a hard segment, and other polymers (for example, polybutadiene, polyisoprene, polyethylene, hydrogenated polybutadiene, hydrogenated polyisoprene, etc.) are amorphous and have a low glass transition temperature. The material which comprises a soft segment is mentioned. As the polystyrene forming the hard segment, for example, those obtained by a known radical polymerization method or ionic polymerization method can be suitably used, and examples thereof include polystyrene having anion living polymerization.

  Examples of the polymer forming the soft segment include polybutadiene, polyisoprene, poly (2,3-dimethyl-butadiene), and the like.

  As a combination of the above-mentioned hard segment and a soft segment, each combination of a hard segment and a soft segment mentioned above can be mentioned. Among these, a combination of polystyrene / polybutadiene and a combination of polystyrene / polyisoprene are preferable. Moreover, in order to suppress the unintended cross-linking reaction of the thermoplastic elastomer, the soft segment is preferably hydrogenated.

The number average molecular weight of the polymer (polystyrene) constituting the hard segment is preferably 5,000 to 500,000, and preferably 10,000 to 200,000.
Moreover, as a number average molecular weight of the polymer which comprises the said soft segment, 5000-1 million are preferable, 10000-800000 are more preferable, and 30000-500000 are especially preferable. Furthermore, the volume ratio (x: y) to the hard segment (x) and the soft segment (y) is preferably 5:95 to 80:20, more preferably 10:90 to 70:30, from the viewpoint of moldability. preferable.

The polystyrene-based thermoplastic elastomer can be synthesized by copolymerizing the polymer that forms the hard segment and the polymer that forms the soft segment by a known method.
Examples of the polystyrene-based thermoplastic elastomer include styrene-butadiene copolymer [SBS (polystyrene-poly (butylene) block-polystyrene), SEBS (polystyrene-poly (ethylene / butylene) block-polystyrene)], styrene-isoprene copolymer. Polymer [polystyrene-polyisoprene block-polystyrene), styrene-propylene copolymer [SEP (polystyrene- (ethylene / propylene) block-polystyrene), SEPS (polystyrene-poly (ethylene / propylene) block-polystyrene), SEEPS (polystyrene) -Poly (ethylene-ethylene / propylene) block-polystyrene), SEB (polystyrene (ethylene / butylene) block) and the like.

  As the polystyrene-based thermoplastic elastomer, for example, “Tough Tech” series (for example, H1031, H1041, H1043, H1051, H1052, H1053, H1082, H1141, H1221, H1272) manufactured by Asahi Kasei Co., Ltd., Kuraray Co., Ltd. SEBS (8007, 8076, etc.) and SEPS (2002, 2063, etc.) manufactured by the company can be used.

-Polyolefin thermoplastic elastomer-
The polyolefin-based thermoplastic elastomer is a soft segment having at least a crystalline polyolefin and a high melting point, and other polymers (for example, the polyolefin, other polyolefins, and polyvinyl compounds) are amorphous and have a low glass transition temperature. The material which comprises the segment is mentioned. Examples of the polyolefin forming the hard segment include polyethylene, polypropylene, isotactic polypropylene, polybutene, and the like.
Examples of the polyolefin-based thermoplastic elastomer include olefin-α-olefin random copolymers, olefin block copolymers, and the like. For example, propylene block copolymers, ethylene-propylene copolymers, propylene-1-hexene copolymers. Polymer, propylene-4-methyl-1-pentene copolymer, propylene-1-butene copolymer, ethylene-1-hexene copolymer, ethylene-4-methyl-pentene copolymer, ethylene-1-butene copolymer Polymer, 1-butene-1-hexene copolymer, 1-butene-4-methyl-pentene, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-ethyl methacrylate copolymer, Ethylene-butyl methacrylate copolymer, ethylene-methyl acrylate copolymer, Lene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer, propylene-methacrylic acid copolymer, propylene-methyl methacrylate copolymer, propylene-ethyl methacrylate copolymer, propylene-butyl methacrylate copolymer , Propylene-methyl acrylate copolymer, propylene-ethyl acrylate copolymer, propylene-butyl acrylate copolymer, ethylene-vinyl acetate copolymer, propylene-vinyl acetate copolymer, and the like.

Examples of the polyolefin-based thermoplastic elastomer include a propylene block copolymer, an ethylene-propylene copolymer, a propylene-1-hexene copolymer, a propylene-4-methyl-1-pentene copolymer, and a propylene-1-butene copolymer. Polymer, ethylene-1-hexene copolymer, ethylene-4-methyl-pentene copolymer, ethylene-1-butene copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene- Ethyl methacrylate copolymer, ethylene-butyl methacrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer, propylene-methacrylic acid copolymer, propylene- Methyl methacrylate copolymer, propylene Ethyl tacrylate copolymer, propylene-butyl methacrylate copolymer, propylene-methyl acrylate copolymer, propylene-ethyl acrylate copolymer, propylene-butyl acrylate copolymer, ethylene-vinyl acetate copolymer, propylene- Vinyl acetate copolymers are preferred, ethylene-propylene copolymers, propylene-1-butene copolymers, ethylene-1-butene copolymers, ethylene-methyl methacrylate copolymers, ethylene-methyl acrylate copolymers, More preferred are ethylene-ethyl acrylate copolymers and ethylene-butyl acrylate copolymers.
Moreover, you may use combining 2 or more types of polyolefin resin like ethylene and propylene. The polyolefin content in the polyolefin-based thermoplastic elastomer is preferably 50% by mass or more and 100% by mass or less.

  The number average molecular weight of the polyolefin-based thermoplastic elastomer is preferably 5,000 to 10,000,000. When the number average molecular weight of the polyolefin-based thermoplastic elastomer is in the range of 5,000 to 10,000,000, the mechanical properties of the thermoplastic resin material are sufficient and the processability is also excellent. From the same viewpoint, it is more preferably 7,000 to 1,000,000, and particularly preferably 10,000 to 1,000,000. Thereby, the mechanical properties and workability of the thermoplastic resin material can be further improved. Moreover, as a number average molecular weight of the polymer which comprises the said soft segment, 200-6000 are preferable from a viewpoint of toughness and low temperature flexibility. Furthermore, the mass ratio (x: y) to the hard segment (x) and the soft segment (y) is preferably 50:50 to 95:15, more preferably 50:50 to 90:10, from the viewpoint of moldability. preferable.

  The polyolefin-based thermoplastic elastomer can be synthesized by copolymerization by a known method.

Examples of the polyolefin-based thermoplastic elastomer include, for example, commercially available “Tafmer” series manufactured by Mitsui Chemicals (for example, A0550S, A1050S, A4050S, A1070S, A4070S, A35070S, A1085S, A4085S, A7090, A700090, MH7007, MH7010, XM-7070, XM-7080, BL4000, BL2481, BL3110, BL3450, P-0275, P-0375, P-0775, P-0180, P-0280, P-0480, P-0680), Mitsui DuPont Polychemical "Nucrel" series (for example, AN4214C, AN4225C, AN42115C, N0903HC, N0908C, AN42012C, N410, N1050H, N1108C, 1110H, N1207C, N1214, AN4221C, N1525, N1560, N0200H, AN4228C, AN4213C, N035C, “Elvalloy AC” series (for example, 1125AC, 1209AC, 1218AC, 1609AC, 1820AC, 1913AC, 2112AC, 2116AC, 2615AC, 2715AC, 3117AC, 2715AC, 3117AC 3427AC, 3717AC), Sumitomo Chemical Co., Ltd. “ACRlift” series, “Evertate” series, Tosoh Corporation “Ultrasen” series, and the like.
Further, as the polyolefin-based thermoplastic elastomer, for example, “Prime TPO” series (for example, E-2900H, F-3900H, E-2900, F-3900, J-5900, E-manufactured by a commercial prime polymer). 2910, F-3910, J-5910, E-2710, F-3710, J-5910, E-2740, F-3740, R110MP, R110E, T310E, M142E, etc.) can also be used.

-Polyester thermoplastic elastomer-
The polyester-based thermoplastic elastomer comprises a hard segment having at least a crystalline polyester and a high melting point, and a soft segment having a low glass transition temperature and other polymers (for example, polyester or polyether). Materials.

An aromatic polyester can be used as the polyester that forms the hard segment. The aromatic polyester can be formed, for example, from an aromatic dicarboxylic acid or an ester-forming derivative thereof and an aliphatic diol. The aromatic polyester is preferably terephthalic acid and / or polybutylene terephthalate derived from dimethyl terephthalate and 1,4-butanediol, and further, isophthalic acid, phthalic acid, naphthalene-2,6-dicarboxylic acid, Dicarboxylic acid components such as naphthalene-2,7-dicarboxylic acid, diphenyl-4,4′-dicarboxylic acid, diphenoxyethanedicarboxylic acid, 5-sulfoisophthalic acid, or ester-forming derivatives thereof, and diols having a molecular weight of 300 or less For example, aliphatic diols such as ethylene glycol, trimethylene glycol, pentamethylene glycol, hexamethylene glycol, neopentyl glycol, decamethylene glycol, 1,4-cyclohexanedimethanol, tricyclodecanedi Cycloaliphatic diols such as methylol, xylylene glycol, bis (p-hydroxy) diphenyl, bis (p-hydroxyphenyl) propane, 2,2-bis [4- (2-hydroxyethoxy) phenyl] propane, bis [4 -(2-hydroxy) phenyl] sulfone, 1,1-bis [4- (2-hydroxyethoxy) phenyl] cyclohexane, 4,4'-dihydroxy-p-terphenyl, 4,4'-dihydroxy-p-quarter It may be a polyester derived from an aromatic diol such as phenyl, or a copolyester in which two or more of these dicarboxylic acid components and diol components are used in combination. It is also possible to copolymerize a trifunctional or higher polyfunctional carboxylic acid component, a polyfunctional oxyacid component, a polyfunctional hydroxy component, and the like in a range of 5 mol% or less.
Examples of the polyester that forms the hard segment include polyethylene terephthalate, prebutylene terephthalate, polymethylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, and the like, and polybutylene terephthalate is preferable.

Examples of the polymer forming the soft segment include aliphatic polyesters and aliphatic polyethers.
Examples of the aliphatic polyether include poly (ethylene oxide) glycol, poly (propylene oxide) glycol, poly (tetramethylene oxide) glycol, poly (hexamethylene oxide) glycol, a copolymer of ethylene oxide and propylene oxide, and poly (propylene oxide). And ethylene oxide addition polymer of glycol, and a copolymer of ethylene oxide and tetrahydrofuran.
Examples of the aliphatic polyester include poly (ε-caprolactone), polyenantlactone, polycaprylolactone, polybutylene adipate, and polyethylene adipate.
Among these aliphatic polyethers and aliphatic polyesters, poly (tetramethylene oxide) glycol, poly (propylene oxide) glycol ethylene oxide adduct, poly (ε -Caprolactone), polybutylene adipate, polyethylene adipate and the like are preferred.

  Moreover, as a number average molecular weight of the polymer which comprises the said soft segment, 300-6000 are preferable from a viewpoint of toughness and low temperature flexibility. Furthermore, the mass ratio (x: y) to the hard segment (x) and the soft segment (y) is preferably 99: 1 to 20:80, more preferably 98: 2 to 30:70, from the viewpoint of moldability. preferable.

  As a combination of the above-mentioned hard segment and a soft segment, each combination of a hard segment and a soft segment mentioned above can be mentioned. Among these, a combination of polybutylene terephthalate and soft segment aliphatic polyether is preferable for the hard segment, polybutylene terephthalate for the hard segment, and poly (ethylene oxide) glycol for the soft segment is more preferable.

-Polyester thermoplastic elastomer-
The polyester-based thermoplastic elastomer comprises a hard segment having at least a crystalline polyester and a high melting point, and a soft segment having a low glass transition temperature and other polymers (for example, polyester or polyether). Materials.

An aromatic polyester can be used as the polyester that forms the hard segment. The aromatic polyester can be formed, for example, from an aromatic dicarboxylic acid or an ester-forming derivative thereof and an aliphatic diol. The aromatic polyester is preferably terephthalic acid and / or polybutylene terephthalate derived from dimethyl terephthalate and 1,4-butanediol, and further, isophthalic acid, phthalic acid, naphthalene-2,6-dicarboxylic acid, Dicarboxylic acid components such as naphthalene-2,7-dicarboxylic acid, diphenyl-4,4′-dicarboxylic acid, diphenoxyethanedicarboxylic acid, 5-sulfoisophthalic acid, or ester-forming derivatives thereof, and diols having a molecular weight of 300 or less For example, aliphatic diols such as ethylene glycol, trimethylene glycol, pentamethylene glycol, hexamethylene glycol, neopentyl glycol, decamethylene glycol, 1,4-cyclohexanedimethanol, tricyclodecanedi Cycloaliphatic diols such as methylol, xylylene glycol, bis (p-hydroxy) diphenyl, bis (p-hydroxyphenyl) propane, 2,2-bis [4- (2-hydroxyethoxy) phenyl] propane, bis [4 -(2-hydroxy) phenyl] sulfone, 1,1-bis [4- (2-hydroxyethoxy) phenyl] cyclohexane, 4,4'-dihydroxy-p-terphenyl, 4,4'-dihydroxy-p-quarter It may be a polyester derived from an aromatic diol such as phenyl, or a copolyester in which two or more of these dicarboxylic acid components and diol components are used in combination. It is also possible to copolymerize a trifunctional or higher polyfunctional carboxylic acid component, a polyfunctional oxyacid component, a polyfunctional hydroxy component, and the like in a range of 5 mol% or less.
Examples of the polyester that forms the hard segment include polyethylene terephthalate, prebutylene terephthalate, polymethylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, and the like, and polybutylene terephthalate is preferable.

Examples of the polymer forming the soft segment include aliphatic polyesters and aliphatic polyethers.
Examples of the aliphatic polyether include poly (ethylene oxide) glycol, poly (propylene oxide) glycol, poly (tetramethylene oxide) glycol, poly (hexamethylene oxide) glycol, a copolymer of ethylene oxide and propylene oxide, and poly (propylene oxide). And ethylene oxide addition polymer of glycol, and a copolymer of ethylene oxide and tetrahydrofuran.
Examples of the aliphatic polyester include poly (ε-caprolactone), polyenantlactone, polycaprylolactone, polybutylene adipate, and polyethylene adipate.
Among these aliphatic polyethers and aliphatic polyesters, poly (tetramethylene oxide) glycol, poly (propylene oxide) glycol ethylene oxide adduct, poly (ε -Caprolactone), polybutylene adipate, polyethylene adipate and the like are preferred.

  Moreover, as a number average molecular weight of the polymer which comprises the said soft segment, 300-6000 are preferable from a viewpoint of toughness and low temperature flexibility. Furthermore, the mass ratio (x: y) to the hard segment (x) and the soft segment (y) is preferably 99: 1 to 20:80, more preferably 98: 2 to 30:70, from the viewpoint of moldability. preferable.

  As a combination of the above-mentioned hard segment and a soft segment, each combination of a hard segment and a soft segment mentioned above can be mentioned. Among these, a combination of polybutylene terephthalate and soft segment aliphatic polyether is preferable for the hard segment, polybutylene terephthalate for the hard segment, and poly (ethylene oxide) glycol for the soft segment is more preferable.

  The above-mentioned thermoplastic elastomer can be synthesized by copolymerizing the polymer forming the hard segment and the polymer forming the soft segment by a known method.

The melting point of the resin material is usually about 100 ° C to 350 ° C, preferably about 100 to 250 ° C, more preferably 100 ° C to 200 ° C from the viewpoint of tire productivity.
Further, the durability and productivity of the tire can be improved. Examples of the resin material include rubber, elastomer, thermoplastic resin, various fillers (for example, silica, calcium carbonate, clay), anti-aging agent, oil, plasticizer, color former, weathering agent, and reinforcing material. Various additives such as these may be contained (blended).

  The tensile modulus of elasticity of the resin material specified in JIS K7113: 1995 (hereinafter referred to as “elastic modulus” in the present specification unless otherwise specified) is preferably 100 to 1000 MPa, ˜800 MPa is more preferable, and 100 to 700 MPa is particularly preferable. When the tensile elastic modulus of the resin material is 100 to 1000 MPa, the rim can be assembled efficiently while maintaining the shape of the tire frame.

  The tensile yield strength specified in JIS K7113: 1995 of the resin material is preferably 5 MPa or more, preferably 5 to 20 MPa, and more preferably 5 to 17 MPa. When the tensile yield strength of the resin material is 5 MPa or more, the resin material can withstand deformation against a load applied to the tire during traveling.

  The tensile yield elongation defined by JIS K7113: 1995 of the resin material is preferably 10% or more, preferably 10 to 70%, and more preferably 15 to 60%. When the tensile yield elongation of the resin material is 10% or more, the elastic region is large and the rim assembly property can be improved.

  The tensile fracture elongation specified in JIS K7113: 1995 of the resin material is preferably 50% or more, preferably 100% or more, more preferably 150% or more, and particularly preferably 200% or more. When the tensile fracture elongation of the resin material is 50% or more, the rim assembly property is good and it is possible to make it difficult to break against a collision.

  As a deflection temperature under load (at the time of 0.45 MPa load) specified in ISO75-2 or ASTM D648 of the resin material, 50 ° C. or higher is preferable, 50 to 150 ° C. is preferable, and 50 to 130 ° C. is more preferable. When the deflection temperature under load of the resin material is 50 ° C. or higher, deformation of the tire frame body can be suppressed even when vulcanization is performed in the manufacture of the tire.

[First Embodiment]
A tire according to a first embodiment of the tire of the present invention will be described below with reference to the drawings.
The tire 10 of this embodiment will be described. The tire of the present embodiment has an indicator region whose color changes according to the amount of absorbed ultraviolet light. FIG. 5A is a perspective view showing a partial cross section of a tire according to an embodiment of the present invention. FIG. 5B is a cross-sectional view of the bead portion attached to the rim. As shown in FIG. 5, the tire 10 of the present embodiment has a cross-sectional shape substantially similar to that of a conventional general rubber pneumatic tire.

  As shown in FIG. 5 (A), the tire 10 includes a pair of bead portions 12 that contact the bead seat 21 and the rim flange 22 of the rim 20 shown in FIG. A tire case 17 comprising: a side portion 14 extending in the direction of a tire; and a crown portion 16 (outer peripheral portion) for connecting a tire radial direction outer end of one side portion 14 and a tire radial direction outer end of the other side portion 14. ing. The tire case 17 is provided with an indicator region 2 </ b> A continuously along the circumferential direction of the side portion 14.

  Here, the tire case 17 of the present embodiment is formed of a thermoplastic resin material (polyamide thermoplastic elastomer (“Ubesta XPA9055X1” manufactured by Ube Industries, Ltd., melting point 164 ° C.)). In the present embodiment, the tire case 17 is formed of a single thermoplastic resin material. However, the present invention is not limited to this configuration, and the tire case 17 is similar to a conventional rubber pneumatic tire. You may use the thermoplastic resin material which has a different characteristic for every site | part (the side part 14, the crown part 16, the bead part 12, etc.). Further, a reinforcing material (polymer material, metal fiber, cord, nonwoven fabric, woven fabric, etc.) is embedded in the tire case 17 (for example, the bead portion 12, the side portion 14, the crown portion 16 and the like), and the reinforcing material is provided. The tire case 17 may be reinforced.

  The tire case 17 of the present embodiment is obtained by joining a pair of tire case halves (tire frame pieces) 17A formed of a thermoplastic resin material. The tire case half 17A is formed by injection molding or the like so that one bead portion 12, one side portion 14, and a half-width crown portion 16 are integrated with each other so as to face each other. It is formed by joining at the tire equator part. The tire case 17 is not limited to the one formed by joining two members, and may be formed by joining three or more members.

The tire case half 17A formed of a thermoplastic resin material can be molded by, for example, vacuum molding, pressure molding, injection molding, melt casting, or the like. For this reason, it is not necessary to perform vulcanization compared to the case where the tire case is molded with rubber as in the prior art, the manufacturing process can be greatly simplified, and the molding time can be omitted.
In the present embodiment, the tire case half body 17A has a symmetrical shape, that is, the one tire case half body 17A and the other tire case half body 17A have the same shape. There is also an advantage that only one type of mold is required.

  In the present embodiment, as shown in FIG. 5 (B), an annular bead core 18 made of a steel cord is embedded in the bead portion 12 as in a conventional general pneumatic tire. However, the present invention is not limited to this configuration, and the bead core 18 can be omitted if the rigidity of the bead portion 12 is ensured and there is no problem in fitting with the rim 20. In addition to the steel cord, an organic fiber cord, a resin-coated organic fiber cord, or a hard resin may be used.

  In the present embodiment, a material having a better sealing property than a thermoplastic resin material constituting the tire case 17 at a portion that contacts the rim 20 of the bead portion 12 or at least a portion that contacts the rim flange 22 of the rim 20, for example, An annular seal layer 24 made of rubber is formed. The seal layer 24 may also be formed at a portion where the tire case 17 (bead portion 12) and the bead sheet 21 are in contact with each other. As a material having a better sealing property than the thermoplastic resin material constituting the tire case 17, a softer material can be used as compared with the thermoplastic resin material constituting the tire case 17. As the rubber that can be used for the seal layer 24, it is preferable to use the same type of rubber as that used on the outer surface of the bead portion of a conventional general rubber pneumatic tire. If the sealing property with the rim 20 can be secured only with the thermoplastic resin material, the rubber seal layer 24 may be omitted, and other thermoplastic resins (thermoplastic properties) that have better sealing properties than the thermoplastic resin material. Elastomer) may be used. Examples of such other thermoplastic resins include resins such as polyurethane resins, polyolefin resins, polystyrene resins, and polyester resins, and blends of these resins with rubbers or elastomers. Thermoplastic elastomers can also be used, for example, polyester-based thermoplastic elastomers, polyurethane-based thermoplastic elastomers, polystyrene-based thermoplastic elastomers, polyolefin-based thermoplastic elastomers, combinations of these elastomers, and blends with rubber. Thing etc. are mentioned.

  As shown in FIG. 5, a reinforcing cord 26 having higher rigidity than the thermoplastic resin material constituting the tire case 17 is wound around the crown portion 16 in the circumferential direction of the tire case 17. The reinforcing cord 26 is wound spirally in a state in which at least a part thereof is embedded in the crown portion 16 in a cross-sectional view along the axial direction of the tire case 17, thereby forming a reinforcing cord layer 28. A tread 30 made of a material having higher wear resistance than the thermoplastic resin material constituting the tire case 17, for example, rubber, is disposed on the outer circumferential side of the reinforcing cord layer 28 in the tire radial direction.

  The indicator region 2A provided in the side portion 14 has the same color as the initial tire case 17 but is configured to color yellow according to the amount of ultraviolet light absorbed by the indicator region 2A. In the indicator region 2A, an infinite number of ultraviolet curable microcapsules (not shown) are dispersed in the thermoplastic resin material constituting the tire case 17. The ultraviolet curable microcapsule has a microcapsule wall formed of an ultraviolet curable resin and includes a yellow color former. Further, the microcapsule is configured such that when the ultraviolet ray is absorbed, the capsule wall is hardened and easily broken, and the encapsulated color former is likely to flow out. Therefore, when the ultraviolet ray irradiation amount of the tire 10 (indicator region 2A) exceeds a certain amount due to the passage of time or the like, the capsule wall of the microcapsule is easily broken even with a slight impact, and the encapsulated colorant flows out and the indicator region The inside can be colored yellow.

  The reinforcing cord layer 28 formed by the reinforcing cord 26 will be described with reference to FIG. FIG. 6 is a cross-sectional view along the tire rotation axis showing a state where a reinforcing cord is embedded in a crown portion of the tire case of the tire of the first embodiment. As shown in FIG. 6, the reinforcing cord 26 is spirally wound in a state in which at least a part is embedded in the crown portion 16 in a sectional view along the axial direction of the tire case 17. A reinforcing cord layer 28 indicated by a broken line portion in FIG. 6 is formed together with a part of the outer peripheral portion 17. The portion embedded in the crown portion 16 of the reinforcing cord 26 is in close contact with the thermoplastic resin material constituting the crown portion 16 (tire case 17). As the reinforcing cord 26, a monofilament (single wire) such as a metal fiber or an organic fiber, or a multifilament (twisted wire) obtained by twisting these fibers such as a steel cord twisted with a steel fiber can be used. In the present embodiment, a steel cord is used as the reinforcing cord 26.

  In FIG. 6, the burying amount L indicates the burying amount of the reinforcing cord 26 in the tire rotation axis direction with respect to the tire case 17 (crown portion 16). The embedding amount L of the reinforcing cord 26 in the crown portion 16 is preferably 1/5 or more of the diameter D of the reinforcing cord 26, and more preferably more than 1/2. Most preferably, the entire reinforcing cord 26 is embedded in the crown portion 16. When the embedment amount L of the reinforcing cord 26 exceeds 1/2 of the diameter D of the reinforcing cord 26, it is difficult to jump out of the embedded portion due to the size of the reinforcing cord 26. Further, when the entire reinforcing cord 26 is embedded in the crown portion 16, the surface (outer peripheral surface) becomes flat, and even if a member is placed on the crown portion 16 where the reinforcing cord 26 is embedded, Air can be prevented from entering. The reinforcing cord layer 28 corresponds to a belt disposed on the outer peripheral surface of the carcass of a conventional rubber pneumatic tire.

  As described above, the tread 30 is disposed on the outer peripheral side of the reinforcing cord layer 28 in the tire radial direction. The rubber used for the tread 30 is preferably the same type of rubber as that used in conventional rubber pneumatic tires. Instead of the tread 30, a tread formed of another type of thermoplastic resin material that is more excellent in wear resistance than the thermoplastic resin material constituting the tire case 17 may be used. Further, the tread 30 is formed with a tread pattern including a plurality of grooves on the ground contact surface with the road surface in the same manner as a conventional rubber pneumatic tire.

(Tire manufacturing equipment)
Next, the manufacturing apparatus of the tire 10 of this embodiment is demonstrated. FIG. 7 is an explanatory diagram for explaining the operation of setting the tire half body on the tire support portion of the molding machine used when forming the tire 10.

  FIG. 7 is a perspective view showing a main part of the molding machine 32 used when forming the tire 10. In FIG. 7, the molding machine 32 has a geared motor 37 for rotating a horizontally disposed shaft 36 attached to an upper portion of a pedestal 34 that is grounded to the floor surface.

A tire support portion 40 is provided on the end portion side of the shaft 36. The tire support 40 includes a cylinder block 38 fixed to the shaft 36, and a plurality of cylinder rods 41 extending radially outward are provided at equal intervals in the circumferential direction.
A tire support piece 42 having an arcuate curved surface 42A whose outer surface is set substantially equal to the radius of curvature of the tire inner surface is provided at the tip of the cylinder rod 41.

  In the tire support portion 40, the cylinder rods 41 can move in the same amount radially in conjunction with each other. Here, FIG. 8A is a perspective view showing a state in which the protrusion amount of the cylinder rod of the tire support portion of the molding machine is the smallest. FIG. 8B is a perspective view showing a state in which the protruding amount of the cylinder rod of the tire support portion of the molding machine is the largest. 7 and 8A, the tire support portion 40 shows a state where the protruding amount of the cylinder rod 41 is the smallest (the tire support portion 40 has a minimum diameter). On the other hand, FIG. 8 (B) shows a state in which the protruding amount of the cylinder rod 41 is the largest (the tire support portion 40 has the maximum diameter).

As shown in FIG. 9, when the tire case 17 is divided into a plurality of parts and formed in the vicinity of the molding machine 32, these tire frame pieces (in this embodiment, the tire case 17 is divided into a left and right half tire case half). An extruder 44 for extruding a thermoplastic resin material for welding used to integrate the body 17A by welding and integration) is disposed. FIG. 9 is an explanatory diagram for explaining the operation of attaching the thermoplastic resin material for welding to the joint portion of the tire half using an extruder. In FIG. 9, the extruder 44 includes a nozzle 46 that discharges the molten welding thermoplastic resin material 43 downward.
As the thermoplastic resin material 43 for welding, a thermoplastic resin material constituting the tire case 17 and a resin having high adhesiveness can be used, and the same kind of material as the thermoplastic resin material constituting the tire case 17 is used. Is preferably used. Further, different types may be used as long as the tire case 17 can be welded. In the present embodiment, the thermoplastic resin material (polyamide-based thermoplastic elastomer ("Uvesta XPA9055X1" manufactured by Ube Industries, Ltd.) forming the tire case 17 is used as the thermoplastic resin material 43 for welding.

  Further, in the vicinity of the nozzle 46, the leveling roller 48 that presses the welding thermoplastic resin material 43 attached to the periphery of the joint portion of the tire case half 17A and the leveling roller 48 are moved in the vertical direction. A cylinder device 50 is arranged. The cylinder device 50 is supported on the support column 52 of the extruder 44 through a frame (not shown). The extruder 44 is movable in a direction parallel to the shaft 36 of the molding machine 32 along a guide rail 54 disposed on the floor surface.

  On the guide rail 54, a cord supply device 56 including a reel 58, a cord heating device 59 and the like is movably mounted as shown in FIG. FIG. 10 is an explanatory diagram for explaining an operation of embedding a reinforcing cord in a crown portion of a tire case using a cord heating device and rollers.

  In FIG. 10, the cord supply device 56 is disposed on the reel 58 around which the reinforcing cord 26 is wound, the cord heating device 59 disposed on the downstream side of the reel 58 in the cord transport direction, and the downstream side of the reinforcing cord 26 in the transport direction. The first roller 60, the first cylinder device 62 that moves the first roller 60 in the direction of contacting and separating from the outer peripheral surface of the tire, and the downstream side in the conveying direction of the reinforcing cord 26 of the first roller 60 A second roller 64, and a second cylinder device 66 that moves the second roller 64 in a direction in which the second roller 64 comes in contact with and separates from the tire outer peripheral surface. The second roller 64 can be used as a metal cooling roller. Further, in the present embodiment, the surface of the first roller 60 or the second roller 64 is made of a fluororesin (in this embodiment, Teflon (registered trademark)) in order to suppress adhesion of a molten or softened thermoplastic resin material. ). In the present embodiment, the cord supply device 56 is configured to have two rollers, the first roller 60 or the second roller 64, but the present invention is not limited to this configuration, and any one of the rollers. It is also possible to have only one (that is, one roller).

  The cord heating device 59 includes a heater 70 and a fan 71 that generate hot air. Further, the cord heating device 59 includes a heating box 74 through which the reinforcing cord 26 passes through an internal space in which hot air is supplied, and a discharge port 76 for discharging the heated reinforcing cord 26.

Hereinafter, the tire manufacturing method of the present invention will be described.
-Tire case molding process-
The tire case molding process will be described with reference to the drawings. FIG. 11 is a perspective view of a tire support that supports the tire half and the tire inner surface support ring.

  First, when molding the tire case half 17A by injection molding, a resin composition in which the microcapsules are dispersed in the same kind of resin material as the tire case half 17A is injected into a mold. As a method for injecting two or more kinds of resins, a known method can be appropriately employed. Thereby, the tire case half body 17A in which the indicator region 2A is integrally formed is formed. Further, the injection molding of the tire case half body 17A is performed such that a patterned indicator region 2A along the circumferential direction is formed on the side portion 14 thereof. In the present embodiment, the indicator region is formed integrally with the tire frame half, but the aspect of the present invention is not limited to this.

  Next, the tire case 17 having the completed indicator region 2A and the tire case half not provided with the indicator region are joined together to form the tire case 17. In FIG. 11, as shown in FIG. 8A, two tire case halves 17 </ b> A that face each other face each other are disposed on the outer peripheral side of the tire support portion 40 whose diameter is reduced, and two tires A cylindrical tire inner surface support ring 72 made of a thin metal plate (for example, a steel plate having a thickness of 0.5 mm) is disposed inside the case half body 17A (in FIG. 11, in order to show the inside, the tire case half body The body 17A is removed and described.) The outer diameter of the tire inner surface support ring 72 is set to be approximately the same as the inner diameter of the outer peripheral portion of the tire case half body 17A, and the outer peripheral surface of the tire inner surface support ring 72 is within the outer peripheral portion of the tire case half body 17A. It comes in close contact with the peripheral surface. As a result, the inner surface side of the joint portion between the tire case halves 17A is in close contact with the outer peripheral surface of the tire inner surface support ring 72, and the tire support portion is formed by the gap between the tire support piece 42 and the tire support piece 42 of the tire support portion 40. Occurrence of unevenness (opposite shape of the unevenness) of the joint portion (welding thermoplastic resin material 43) due to the unevenness occurring on the outer periphery can be suppressed. Moreover, it is possible to suppress the occurrence of unevenness in the arrangement member (the tire case 17, the tread 30, and other tire constituent members (for example, a belt reinforcing layer)) due to the gap between the tire support pieces 42. That is, it is possible to suppress the occurrence of unevenness in a portion corresponding to the gap between the tire support pieces 42 of the arrangement member due to the force (tension, pressing force, etc.) applied when arranging the arrangement member. Since the tire inner surface support ring 72 is formed of a thin metal plate, it can be easily inserted into the tire case half body 17A by being bent and deformed.

  Next, as shown in FIG. 11, the diameter of the tire support portion 40 is enlarged, the plurality of tire support pieces 42 are brought into contact with the inner peripheral surface of the tire inner surface support ring 72, and the tire inner surfaces are formed by the plurality of tire support pieces 42. The support ring 72 is held from the inside (note that both tire case halves 17A are removed in FIG. 11 to show the inside).

-Tire case half joining process-
Next, the outer peripheral surface of the abutting portion of the tire case half A is supported on the outer peripheral surface side of the two tire case halves 17A that are supported by the tire inner surface support ring 72 and abutted against each other so that the joining surfaces are in contact with each other. Install a joining die that is not shown in the figure. Here, the said joining metal mold | die is comprised so that the periphery of the junction part (butting part) of the tire case half A may be pressed with a predetermined pressure, and a tire case is heated while heating the junction of the tire case half A The half A can be configured to rotate in the circumferential direction. Next, the joining mold is heated so that the periphery of the joining portion of the tire case half A is equal to or higher than the melting point of the thermoplastic resin material constituting the tire case. According to this embodiment, for example, the heating temperature can be set to about 210 ° C. in accordance with the melting point (164 ° C.) of the polyamide-based thermoplastic resin. When the joining portion of the tire case half A is heated and pressurized by the joining mold, the joining portion is melted and the tire case half A is fused together, and these members are integrated to form the tire case 17. The In the present embodiment, the joining portion of the tire case half A is heated using a joining mold. However, the present invention is not limited to this, and for example, the joining portion is heated by a separately provided high-frequency heater or the like. Alternatively, the tire case halves 17A may be joined by being softened or melted beforehand by hot air, infrared irradiation, or the like, and pressurized by a joining mold.

In the present embodiment, as shown in FIG. 9, the extruder 44 is moved, and the nozzle 46 is disposed above the joining portion (butting portion) of the tire case half body 17A. Then, while rotating the tire support 40 in the direction of arrow A, the welded thermoplastic resin material 43 is extruded from the nozzle 46 toward the joining portion, and melted along the joining portion of the tire case half 17A. A thermoplastic resin material 43 is adhered. The adhering thermoplastic resin material 43 for welding is leveled by the leveling roller 48 arranged on the downstream side, and is welded to the outer peripheral surfaces of both the tire case halves 17A. The welding thermoplastic resin material 43 is gradually solidified by natural cooling, and the joining of the one tire case half body 17A and the other tire case half body 17A becomes stronger by the welding thermoplastic resin material 43.
In addition, in the tire case half body 17A, only the surface of the portion to which the thermoplastic resin material 43 for welding is attached is softened or melted by hot air, infrared irradiation or the like in advance, and the heat for welding is applied to the softened or melted portion. A plastic resin material 43 may be attached. Thereby, the thermoplastic resin material constituting the tire case half 17A and the thermoplastic resin material 43 for welding are well mixed at the joint portion, and the joint strength is improved.

-Reinforcement cord member winding process-
Next, as shown in FIG. 10, the extruder 44 is retracted, and the cord supply device 56 is disposed in the vicinity of the tire support portion 40. Then, the temperature of the heater 70 of the cord heating device 59 is raised, and the ambient air heated by the heater 70 is sent to the heating box 74 by the wind generated by the rotation of the fan 71. Next, the reinforcing cord 26 unwound from the reel 58 is fed into a heating box 74 in which the internal space is heated with hot air (for example, the temperature of the reinforcing cord 26 is heated to about 100 to 200 ° C.). The heated reinforcing cord 26 passes through the discharge port 76 and is wound spirally around the outer peripheral surface of the crown portion 16 of the tire case 17 rotating in the direction of arrow R in FIG. Here, when the heated reinforcing cord 26 comes into contact with the outer peripheral surface of the crown portion 16, the thermoplastic resin material in the contact portion is melted or softened, and at least a part of the heated reinforcing cord 26 is outer peripheral surface of the crown portion 16. Buried in At this time, since the heated reinforcing cord 26 is embedded in the molten or softened thermoplastic resin material, the thermoplastic resin material and the reinforcing cord 26 are in a state where there is no gap, that is, in a close contact state. Thereby, the air entering to the portion where the reinforcing cord 26 is embedded is suppressed. In addition, by heating the reinforcing cord 26 to a temperature higher than the melting point of the thermoplastic resin material of the tire case 17, melting or softening of the thermoplastic resin material in a portion in contact with the reinforcing cord 26 is promoted. By doing in this way, it becomes easy to embed the reinforcement cord 26 in the outer peripheral surface of the crown part 16, and air entry can be effectively suppressed.

  Further, the tension applied to the reinforcing cord 26 is adjusted by applying a brake to the reel 58 that is driven to rotate with respect to the tire case 17. Thus, the reinforcing cord 26 is operated while applying a certain tension. , The meandering of the reinforcing cord 26 can be suppressed, and the embedment amount of the reinforcing cord 26 can also be adjusted. In this embodiment, the tension is adjusted by applying a brake to the reel 58, but the tension may be adjusted by providing a tension adjusting roller in the middle of the conveyance path of the reinforcing cord 26.

  Further, immediately after at least a part of the heated reinforcing cord 26 is embedded in the outer peripheral surface of the crown portion 16, it is pressed by the first roller 60 and embedded deeper. At this time, the periphery of the embedded portion is leveled by the first roller 60, and the air that has entered when the reinforcing cord 26 is embedded is also pushed out. Note that the first roller 60 is driven to rotate with respect to the tire case 17.

  Thereafter, a portion where the thermoplastic resin material is melted or softened by the heated reinforcing cord 26 is forced by the second roller 64 provided downstream of the first roller 60 and pressed against the outer peripheral surface of the crown portion 16. Cooled. Thereby, since the thermoplastic resin material in the portion where the reinforcing cord 26 is embedded is cooled before the reinforcing cord 26 moves, the reinforcing cord 26 can be disposed with high accuracy and the reinforcing cord 26 can be Deformation of the thermoplastic resin material in the embedded portion can be suppressed. The second roller 64 is driven to rotate with respect to the tire case 17.

  The embedment amount L of the reinforcing cord 26 can be adjusted by the heating temperature of the reinforcing cord 26, the tension applied to the reinforcing cord 26, the pressing force by the first roller 60, and the like. In the present embodiment, the embedding amount L of the reinforcing cord 26 is set to be 1/5 or more of the diameter D of the reinforcing cord 26. The burying amount L of the reinforcing cord 26 is more preferably more than 1/2 of the diameter D, and most preferably the entire reinforcing cord 26 is embedded.

  In this way, the reinforcing cord layer 28 is formed on the outer peripheral side of the crown portion 16 of the tire case 17 by winding the heated reinforcing cord 26 while being embedded in the outer peripheral surface of the crown portion 16.

  Next, a vulcanized belt-like tread 30 is wound around the outer peripheral surface of the tire case 17 for one turn, and the tread 30 is bonded to the outer peripheral surface of the tire case 17 using an adhesive or the like. In addition, the precure tread used for the retread tire conventionally known can be used for the tread 30, for example. This step is the same step as the step of bonding the precure tread to the outer peripheral surface of the base tire of the retreaded tire.

  And if the sealing layer 24 which consists of vulcanized rubber is adhere | attached on the bead part 12 of the tire case 17 using an adhesive agent etc., the tire 10 will be completed.

  Finally, the diameter of the tire support portion 40 is reduced, the completed tire 10 is removed from the tire support portion 40, and the inner tire inner surface support ring 68 is bent and deformed and removed from the tire.

(Function)
The tire 10 of the present embodiment has an indicator region 2A that is continuously formed in the side portion 14 along the circumferential direction. The indicator region 2A contains an ultraviolet curable microcapsule containing a yellow color former, and the indicator region is colored yellow when it absorbs a certain amount of ultraviolet light. As described above, since the indicator region 2A develops yellow color in conjunction with the ultraviolet absorption amount of the tire 10 with the passage of time or the like, the user or the like can easily determine the ultraviolet absorption amount of the tire 10 visually from the color development state of the indicator region 2A. For example, it can be used as a guideline for tire replacement timing.

  In the tire 10 of the present embodiment, since the tire case 17 is formed of a polyamide-based thermoplastic elastomer, it is excellent in heat resistance, tensile elastic modulus, tensile strength, and breaking strain, and further compared to a conventional rubber tire. Light weight due to simple structure. For this reason, the tire 10 of this embodiment is excellent in impact resistance, and has high friction resistance and durability.

  In addition, the polyamide-based thermoplastic elastomer easily penetrates between the twisted cords not only between the fibers of the reinforcing cord member itself but also when the reinforcing cord member has a twisted structure of fibers due to its low melt viscosity. For this reason, the adhesiveness with respect to the reinforcement cord 26 is high, and furthermore, fixing performance such as welding strength is excellent. Thereby, the phenomenon (air entering) in which air remains around the reinforcing cord 26 in the reinforcing cord winding step can be suppressed. If the adhesion to the reinforcement cord 26 and the weldability are high, and if air entry around the reinforcement cord member is suppressed, it is possible to effectively suppress the movement of the reinforcement cord 26 due to input during traveling or the like. . Thereby, for example, even when the tire constituent member is provided so as to cover the entire reinforcing cord member on the outer peripheral portion of the tire frame body, the movement of the reinforcing cord member is suppressed. The peeling of the tire frame (including the tire frame) is suppressed, and the durability of the tire 10 is improved.

  In the tire 10 of the present embodiment, the reinforcing cord 26 having higher rigidity than the thermoplastic resin material is spirally wound in the circumferential direction on the outer peripheral surface of the crown portion 16 of the tire case 17 formed of the thermoplastic resin material. Therefore, puncture resistance, cut resistance, and circumferential rigidity of the tire 10 are improved. In addition, the creep of the tire case 17 formed of the thermoplastic resin material is prevented by improving the circumferential rigidity of the tire 10.

  In addition, at least a part of the reinforcing cord 26 is formed on the outer peripheral surface of the crown portion 16 of the tire case 17 formed of a thermoplastic resin material in a cross-sectional view along the axial direction of the tire case 17 (the cross section shown in FIG. 5). Since it is embedded and is in close contact with the thermoplastic resin material, entry of air at the time of manufacture is suppressed, and movement of the reinforcing cord 26 due to input during travel is suppressed. Thereby, it is suppressed that peeling etc. arise in the reinforcement cord 26, the tire case 17, and the tread 30, and durability of the tire 10 improves.

  And since the embedding amount L of the reinforcement cord 26 is 1/5 or more of the diameter D as shown in FIG. 6, the air entry at the time of manufacture is suppressed effectively, the input at the time of driving, etc. This further suppresses the movement of the reinforcing cord 26.

In addition, since the tread 30 that comes into contact with the road surface is made of a rubber material that is more resistant to wear than the thermoplastic resin material that forms the tire case, the wear resistance of the tire 10 is improved.
Further, since an annular bead core 18 made of a metal material is embedded in the bead portion 12, the tire case 17, that is, the tire 10 is strong against the rim 20 like the conventional rubber pneumatic tire. Retained.

  Furthermore, since the seal layer 24 made of a rubber material having a sealing property than the thermoplastic resin material constituting the tire case is provided in a portion of the bead portion 12 that contacts the rim 20, the tire 10 and the rim 20 are provided. The sealing performance between the two is improved. For this reason, the air leak in a tire is further suppressed compared with the case where it seals with the rim | limb 20 and a polyamide-type thermoplastic elastomer. Further, the rim fit property is improved by providing the seal layer 24.

  In the above-described embodiment, the reinforcing cord 26 is heated, and the polyamide-based thermoplastic elastomer in the portion where the heated reinforcing cord 26 contacts is melted or softened. However, the present invention is not limited to this configuration, and the reinforcing cord It is also possible to use a hot air generating device without heating 26 and heat the outer peripheral surface of the crown portion 16 in which the reinforcing cord 26 is embedded, and then embed the reinforcing cord 26 in the crown portion 16. FIG. 12 is an explanatory diagram for explaining an operation of heating a portion in which the reinforcing cord is embedded with a warm air device. In the embodiment shown in FIG. 12, a hot air generator 78 having a fan 82, a heater 80, and a discharge port 84 is used, and the hot air generated by the hot air generator 78 is blown onto the portion where the reinforcing cord 26 is embedded to generate heat. After the plastic resin material is melted or softened, the reinforcing cord 26 is embedded and adhered. In addition, you may use together the code heating apparatus 59 in the above-mentioned embodiment, and the hot air production | generation apparatus 78 of this embodiment. When both are used together, the reinforcing cord 26 can be reliably embedded and adhered in the thermoplastic resin material as compared with the case where only the former or the latter is used.

  In the first embodiment, the heat source of the cord heating device 59 is a heater and a fan. However, the present invention is not limited to this configuration, and the reinforcement cord 26 may be directly heated by radiant heat (for example, infrared rays). Good. Moreover, although the heat source of the hot air generating device 78 is the heater 80 and the fan 82, the present invention is not limited to this configuration. For example, infrared rays are converged on a portion where the reinforcing cord 26 is embedded, and the embedded portion is melted or melted. It may be softened.

  Furthermore, in the first embodiment, the portion in which the thermoplastic resin material in which the reinforcing cord 26 is embedded is melted or softened is forcibly cooled by the metal second roller 64, but the present invention has this configuration. It is not limited, It is good also as a structure which forcibly cools and solidifies the melt | dissolved or softened part of the thermoplastic resin material by spraying cold air directly on the part where the thermoplastic resin material was melted or softened.

  In the first embodiment, the reinforcement cord 26 is heated. However, for example, the outer periphery of the reinforcement cord 26 may be covered with the same thermoplastic resin material as that of the tire case 17. When the reinforcing cord is wound around the crown portion 16 of the tire case 17, the thermoplastic resin material coated together with the reinforcing cord 26 is also heated, so that the air can be effectively suppressed when being embedded in the crown portion 16. .

  The tire 10 of the first embodiment is a so-called tubeless tire in which an air chamber is formed between the tire 10 and the rim 20 by attaching the bead portion 12 to the rim 20, but the present invention is limited to this configuration. It may be a complete tube shape.

Further, although it is easy to manufacture the reinforcing cord 26 in a spiral manner, a method of making the reinforcing cord 26 discontinuous in the width direction is also conceivable.
The embodiments of the present invention have been described above with reference to the embodiments. However, these embodiments are merely examples, and various modifications can be made without departing from the scope of the invention. It goes without saying that the scope of rights of the present invention is not limited to these embodiments.

[Second Embodiment]
Next, a tire manufacturing method and a second embodiment of the tire according to the present invention will be described with reference to the drawings. The tire of this embodiment has an indicator region whose color changes according to the moisture absorption of the tire.
In addition, the tire of the present embodiment has substantially the same cross-sectional shape as a conventional general rubber pneumatic tire, as in the first embodiment described above. For this reason, in the following figures, the same number is attached | subjected about the structure similar to the said 1st Embodiment. FIG. 13A is a cross-sectional view along the tire width direction of the tire of the second embodiment, and FIG. 13B is a tire of a bead portion in a state where a rim is fitted to the tire of the second embodiment. It is an enlarged view of the cross section along the width direction. FIG. 14 is a cross-sectional view along the tire width direction showing the periphery of the reinforcing layer of the tire of the second embodiment.

  In the tire 200 of the second embodiment, the tire case 17 is a thermoplastic resin in which the tire case 17 is made of a polyamide-based thermoplastic elastomer (“Uvesta XPA9055X1” manufactured by Ube Industries, Ltd., melting point 164 ° C.). Made of material. In the present embodiment, the tire 200 is provided with an indicator region 2B in a part of the side portion 14 of the tire case 17 as shown in FIGS. 13 and 14. In addition, a reinforcing cord layer 28 (indicated by a broken line in FIG. 14) formed by winding a covering cord member 26 </ b> B in the circumferential direction is laminated on the crown portion 16. The reinforcing cord layer 28 constitutes the outer peripheral portion of the tire case 17 and reinforces the circumferential rigidity of the crown portion 16.

  The covering cord member 26B is formed by coating a covering resin material 27 that is separate from the thermoplastic resin material forming the tire case 17 on the cord member 26A having higher rigidity than the thermoplastic resin material forming the tire case 17. Is formed. Further, the covering cord member 26B is joined (for example, welded or adhered with an adhesive) at the contact portion with the crown portion 16 where the covering cord member 26B and the crown portion 16 are joined.

  The elastic modulus of the coating resin material 27 is preferably set in the range of 0.1 to 10 times the elastic modulus of the resin material forming the tire case 17. When the elastic modulus of the coating resin material 27 is 10 times or less than the elastic modulus of the thermoplastic resin material forming the tire case 17, the crown portion does not become too hard and rim assembly is facilitated. When the elastic modulus of the coating resin material 27 is 0.1 times or more of the elastic modulus of the thermoplastic resin material forming the tire case 17, the resin constituting the reinforcing cord layer 28 is not too soft and the belt surface Excellent internal shear rigidity and improved cornering force. In the present embodiment, the same material as the thermoplastic resin material (polyamide thermoplastic elastomer (“Uvesta XPA9055X1” manufactured by Ube Industries, Ltd.)) is used as the coating resin material 27.

  In FIG. 13, the indicator region 2B provided on the side portion 14 has the same color as the initial tire case 17 but is configured to develop a pink color according to the amount of moisture absorbed in the indicator region 2B. Yes. The indicator region 2B is composed of a resin material and a cobalt chloride-containing material. In the present embodiment, the cobalt chloride-containing material is dispersed in the thermoplastic resin material constituting the tire case 17. The cobalt chloride-containing material irreversibly changes from blue to pink depending on the degree of moisture absorption. Further, the indicator region 2B is configured to include a cobalt chloride-containing material. Therefore, the indicator region 2B is configured such that the pink density gradually increases with the amount of moisture absorbed by the tire 200 (indicator region 2B) over time. In the present embodiment, the size of the indicator region 2B is not particularly limited and can be set to a desired size.

  As shown in FIG. 14, the covering cord member 26B has a substantially trapezoidal cross-sectional shape. In the following description, the upper surface (the surface on the outer side in the tire radial direction) of the covering cord member 26B is denoted by reference numeral 26U, and the lower surface (the surface on the inner side in the tire radial direction) is denoted by reference numeral 26D. In the present embodiment, the cross-sectional shape of the covering cord member 26B is a substantially trapezoidal shape. However, the present invention is not limited to this configuration, and the cross-sectional shape is from the lower surface 26D side (the tire radial direction inner side) to the upper surface 26U. Any shape may be used as long as the shape excluding the shape that becomes wider toward the side (the tire radial direction outer side).

  As shown in FIG. 14, since the covering cord members 26B are arranged at intervals in the circumferential direction, a gap 28A is formed between the adjacent covering cord members 26B. For this reason, the outer peripheral surface of the reinforcing cord layer 28 is uneven, and the outer peripheral surface 17S of the tire case 17 in which the reinforcing cord layer 28 forms the outer peripheral portion is also uneven.

  On the outer peripheral surface 17S (including irregularities) of the tire case 17, fine roughened irregularities 96 are uniformly formed, and a cushion rubber 29 is bonded thereon via a bonding agent. In the cushion rubber 29, the radially inner rubber portion flows into the roughened unevenness 96.

  In addition, a tread 30 made of a material having higher wear resistance than the resin material forming the tire case 17, for example, rubber, is joined on the cushion rubber 29 (outer peripheral surface).

  The rubber used for the tread 30 (tread rubber 30A) is preferably the same type of rubber as that used for conventional rubber pneumatic tires. Instead of the tread 30, a tread formed of another type of resin material that is more excellent in wear resistance than the resin material forming the tire case 17 may be used. Further, the tread 30 is formed with a tread pattern (not shown) including a plurality of grooves on the ground contact surface with the road surface, similarly to the conventional rubber pneumatic tire.

(Tire manufacturing equipment)
Next, the tire manufacturing apparatus of this embodiment will be described.
The tire manufacturing apparatus in the present embodiment is the same as that in the first embodiment described above. In the cord supply apparatus 56 shown in FIG. 10 of the first embodiment described above, the cord member 26A is attached to the reel 58 with the coating resin material 27. A member obtained by winding a covering cord member 26B having a substantially trapezoidal cross-sectional shape covered with (a thermoplastic material in the present embodiment) is used. Further, as shown in FIG. 15, a blast device 100 for roughening the outer peripheral surface 17S of the tire case 17 is mounted on the guide rail 54 so as to be movable. FIG. 15 is a perspective view showing a state where a roughening process is performed on the outer peripheral surface of the tire case using the blasting device.

  The blast apparatus 100 includes a blast gun 102 for injecting a particulate projection material 104, and causes the projection material 104 to collide with the outer peripheral surface 17S of the tire case 17 to form fine roughening irregularities on the outer peripheral surface 17S. The outer peripheral surface 17S is roughened. Further, as the projection material 104, any material such as a metal or a sand (silica sand) polymer material may be used, and a material that vaporizes from a solid to a gas in the air (for example, dry ice particles) is used. You can also. The blast apparatus 100 is adapted to roughen the outer peripheral surface 17S by causing the projection material 104 to collide with the outer peripheral surface 17S so that the arithmetic average roughness Ra of the outer peripheral surface 17S is 0.05 mm or more.

Next, the manufacturing method of the tire of this embodiment is demonstrated.
(Skeleton formation process)
First, in the same manner as in the first embodiment described above, the tire case half 17A is formed, and this is heated and pressed by a joining mold to form the tire case 17.
Separately, a resin composition in which the polyamide-based thermoplastic elastomer is dispersed so as to contain a cobalt chloride-containing material is prepared, and this is applied to the side portion 14 of the tire case 17 and dried to form the indicator region 2B. Make it. The coating method and the drying method are not particularly limited, and known methods can be used. Moreover, there is no limitation in particular also about the thickness of a coating film, It can be set as a desired size. In the present embodiment, the indicator region 2B is formed after the tire case 17 is molded. However, the present invention is not limited to this. For example, the indicator is attached to the tire case 17 after all the steps are completed. The region 2B may be formed.

  Next, as shown in FIG. 10 described above, the extruder 44 is retracted, and the cord supply device 56 is disposed in the vicinity of the tire support portion 40. Then, the temperature of the heater 70 is raised, and the ambient air heated by the heater 70 is sent to the heating box 74 by the wind generated by the rotation of the fan 71.

  Next, the coated cord member 26B unwound from the reel 58 set in the above process is fed into a heating box 74 in which the internal space is heated with hot air (for example, the temperature of the outer peripheral surface of the coated cord member 26B is The melting point of the resin material 27 for coating is equal to or higher than the melting point). Here, when the covering cord member 26B is heated, the covering resin material 27 is melted or softened.

  The covering cord member 26B is spirally wound around the outer peripheral surface of the crown portion 16 of the tire case 17 that rotates in the front direction of the paper through the discharge port 76 with a certain tension. At this time, the lower surface 26 </ b> D of the covering cord member 26 </ b> B contacts the outer peripheral surface of the crown portion 16. Then, the molten or softened covering resin material 27 in the contacted portion spreads on the outer peripheral surface of the crown portion 16, and the covering cord member 26 </ b> B is welded to the outer peripheral surface of the crown portion 16. Thereby, the joint strength between the crown portion 16 and the covering cord member 26B is improved.

  Further, the tension applied to the covering cord member 26B is adjusted by applying a brake to the reel 58 that is driven to rotate with respect to the tire case 17, and thus the covering cord is operated while applying a certain tension. By winding the member 26B, the covered cord member 26B can be prevented from meandering. In this embodiment, the tension is adjusted by applying a brake to the reel 58. However, the tension may be adjusted by providing a tension adjusting roller in the middle of the conveying path of the coated cord member 26B.

  Further, the coating cord member 26B in which the coating resin material 27 is in a molten or softened state is pressed by the first roller 60 immediately after contacting the outer peripheral surface of the crown portion 16, thereby being in a molten or softened coating resin material. 27 spreads on the outer peripheral surface of the crown portion 16, and a bonding area with the crown portion 16 can be secured. In addition, by pressing in this way, the air that has entered when the covering cord member 26B is brought into contact with the crown portion 16 is also pushed out, and air entering between the covering cord member 26B and the crown portion 16 is further suppressed. The

  Thereafter, the coating resin material 27 in which the coating cord member 26B is melted or softened is forcibly cooled by the second roller 64 provided on the downstream side of the first roller 60. Thereby, since the covering cord member 26B and its surroundings are cooled before the covering cord member 26B moves, the covering cord member 26B can be arranged with high accuracy.

Thus, by winding the covering cord member 26 </ b> B around the crown portion 16 in a spiral manner, the reinforcing cord layer 28 is formed on the outer peripheral side of the crown portion 16, and the outer peripheral portion of the tire case 17 is configured. In the reinforcing cord layer 28, the covering cord members 26B are arranged at intervals, so that a gap 28A is formed, and the outer peripheral surface 17S of the tire case 17 is uneven.
Further, for example, the covering cord member 26B is arranged so that the cross-sectional shape of the covering cord member 26B is substantially rectangular, and the feeding speed in the width direction of the discharge port 76 is adjusted so that no gap is generated between the adjacent covering cord members 26B. By providing, the outer peripheral surface 17S of the tire case 17 can be made flat (flat) instead of uneven.

(Roughening process)
Next, the extruder 44 is retracted, and the blast device 100 is disposed in the vicinity of the tire support portion 40 (see FIG. 15). Then, the blast gun 102 is directed toward the outer peripheral surface 17S of the tire case 17, and the projection material 104 is injected at a high speed onto the outer peripheral surface 17S while rotating the tire case 17 side (arrow R direction). The injected projection material 104 collides with the outer peripheral surface 17S, and fine roughening irregularities 96 having an arithmetic average roughness Ra of 0.05 mm or more are formed on the outer peripheral surface 17S (see FIG. 16). Instead of rotating the tire case 17 side, the blast gun 102 side may be rotated around the circumferential direction of the tire case 17.

  Thus, by forming the fine roughening unevenness 96 on the outer peripheral surface 17S of the tire case 17, the outer peripheral surface 17S becomes hydrophilic, and the wettability of the bonding agent described later is improved.

Here, for example, when the outer peripheral surface 17S of the tire case 17 is roughened using sandpaper, a leuter, or the like, roughening is performed on the concave and convex portions (gap 28A) of the outer peripheral surface 17S of the tire case 17 in particular. It is difficult to perform the processing, and the work becomes complicated.
However, as shown in FIG. 16, by injecting the projection material 104 from the blast gun 102, the concave wall and the concave bottom of the concave portion can be roughened, so that the outer peripheral surface 17S is roughened almost uniformly. can do.

  Further, the roughening range is preferably the same as the range in which cushion rubber 29 described later as the tire constituting rubber member is laminated or wider than the range in which cushion rubber 29 is laminated. As a result, the cushion rubber 29 is laminated in a range in which the entire surface is roughened and the intimacy is improved, so that the bonding strength between the cushion rubber 29 and the tire case 17 is ensured.

The outer peripheral surface 17S is roughened so that the arithmetic average roughness Ra is 0.05 mm or more, and the roughened outer peripheral surface 17S is bonded to the uncured or semi-cured state, for example, via a bonding agent. When the rubber 29 is laminated and vulcanized, the rubber of the cushion rubber 29 flows to the bottom of the roughened unevenness 96 formed by the roughening treatment, so that a sufficient anchor effect is provided between the tire case 17 and the cushion rubber 29. Is exerted, and the bonding strength between the tire case 17 and the cushion rubber 29 is improved. In addition, when the arithmetic average roughness Ra is less than 0.05 mm, the roughened unevenness 96 is shallow, so that the wettability of the bonding agent is increased. Low, sufficient anchor effect is not exhibited, and the joining strength between the tire case 17 and the cushion rubber 29 cannot be sufficiently ensured.

  Further, when a material that evaporates from fixed to gas in the air is used as the projecting material 104, the projecting material 104 changes from fixed to gas in the air after the roughening treatment of the outer peripheral surface 17S of the tire case 17. Since it vaporizes, the projection material 104 does not remain on the outer peripheral surface 17S of the tire case 17. When such a projection material 104 is used, an operation for removing the projection material 104 from the tire case 17 is not required, and the complexity of the operation is improved.

(Lamination process)
Next, a bonding agent is applied to the outer peripheral surface 17S of the tire case 17 subjected to the roughening treatment. The bonding agent is not particularly limited, such as triazine thiol adhesive, chlorinated rubber adhesive, phenolic resin adhesive, isocyanate adhesive, halogenated rubber adhesive, etc., but cushion rubber 29 is vulcanized. It is preferable to react at a temperature (90 ° C. to 140 ° C.) that can be performed.

  Next, the cushion rubber 29 in an unvulcanized state is wound around the outer peripheral surface 17S to which the bonding agent is applied for one round, and a bonding agent such as a rubber cement composition is applied on the cushion rubber 29, A vulcanized or semi-vulcanized tread rubber 30A is wound for one turn to obtain a raw tire case state.

(Vulcanization process)
Next, the raw tire case is accommodated in a vulcanizing can or mold and vulcanized. At this time, the unvulcanized cushion rubber 29 flows into the roughened irregularities 96 formed on the outer peripheral surface 17S of the tire case 17 by the roughening treatment. When the vulcanization is completed, the anchor rubber is exerted by the cushion rubber 29 flowing into the roughened unevenness 96, and the bonding strength between the tire case 17 and the cushion rubber 29 is improved. That is, the bonding strength between the tire case 17 and the tread 30 is improved via the cushion rubber 29.

  And if the sealing layer 24 which consists of a soft material softer than a resin material is adhere | attached on the bead part 12 of the tire case 17 using an adhesive agent etc., the tire 200 will be completed.

  Finally, the diameter of the tire support portion 40 is reduced, the completed tire 200 is removed from the tire support portion 40, the inner tire inner surface support ring 72 is bent and deformed, and removed from the tire.

(Function)
In the tire 200 of the present embodiment, the side portion 14 has an indicator region 2B. In addition, the indicator region 2B is formed of a resin composition made of a polyamide-based thermoplastic elastomer and a cobalt chloride-containing material, and is configured such that the indicator region gradually develops a pink color according to moisture absorption. For this reason, since the indicator area 2B is colored pink in conjunction with the moisture absorption amount of the tire 200 with the passage of time or the like, the user or the like can absorb the moisture absorption amount of the tire 200 (the resin material associated therewith) from the coloration degree of the indicator area 2B. The degree of hydrolysis of the product can be easily determined visually, and this can be used as a guideline for tire replacement timing.

  In the tire 200 of the present embodiment, since the tire case 17 is formed of a thermoplastic resin material made of a polyamide-based thermoplastic elastomer, the tire case 17 is excellent in heat resistance, tensile elastic modulus, tensile strength and breaking strain, and is made of a conventional rubber. Compared to other tires, the structure is simple and the weight is light. For this reason, the tire 200 of this embodiment is excellent in impact resistance, and has high friction resistance and durability. Further, the polyamide-based thermoplastic elastomer has high adhesion to the coated cord member 26B.

  In the tire manufacturing method of the present embodiment, since the outer peripheral surface 17S of the tire case 17 is roughened when the tire case 17, the cushion rubber 29, and the tread rubber 30A are integrated, the bondability is achieved by the anchor effect. (Adhesiveness) is improved. Moreover, since the resin material forming the tire case 17 is dug up by the collision of the projection material 104, the wettability of the bonding agent is improved. Thereby, the bonding agent is held in a uniform applied state on the outer peripheral surface 17S of the tire case 17, and the bonding strength between the tire case 17 and the cushion rubber 29 can be ensured.

  In particular, even when the outer peripheral surface 17S of the tire case 17 is uneven, the projection material 104 is collided with the recess (gap 28A) to roughen the periphery of the recess (concave wall, bottom), and the tire case It is possible to secure the bonding strength between the cushion 17 and the cushion rubber 29.

  On the other hand, since the cushion rubber 29 is laminated in the roughened region of the outer peripheral surface 17S of the tire case 17, the bonding strength between the tire case 17 and the cushion rubber can be effectively ensured.

  In the vulcanization step, when the cushion rubber 29 is vulcanized, the cushion rubber 29 flows into the roughened irregularities 96 formed on the outer peripheral surface 17S of the tire case 17 by the roughening process. When the vulcanization is completed, the anchor rubber is exerted by the cushion rubber 29 flowing into the roughened unevenness 96, and the bonding strength between the tire case 17 and the cushion rubber 29 is improved.

  The tire 200 manufactured by such a tire manufacturing method ensures the bonding strength between the tire case 17 and the cushion rubber 29, that is, the bonding between the tire case 17 and the tread 30 via the cushion rubber 29. Strength is secured. Thereby, the peeling between the outer peripheral surface 17S of the tire case 17 of the tire 200 and the cushion rubber 29 is suppressed during traveling or the like.

  Further, since the outer peripheral portion of the tire case 17 is configured by the reinforcing cord layer 28, the puncture resistance and the cut resistance are improved as compared with the outer peripheral portion configured by other than the reinforcing cord layer 28. To do.

  Further, since the reinforcing cord layer 28 is formed by winding the covering cord member 26B, the circumferential rigidity of the tire 200 is improved. By improving the circumferential rigidity, creep of the tire case 17 (a phenomenon in which plastic deformation of the tire case 17 increases with time under a constant stress) is suppressed, and pressure resistance against air pressure from the inner side in the tire radial direction is suppressed. improves.

  In this embodiment, although the unevenness | corrugation was comprised in the outer peripheral surface 17S of the tire case 17, this invention is not restricted to this, It is good also as a structure which forms the outer peripheral surface 17S flatly. Below, the modification 1 of the tire case 17 which formed the outer peripheral surface 17S flatly is demonstrated.

  A modification of the second embodiment will be described with reference to the drawings. FIG. 17 is a cross-sectional view along the tire width direction of the tire according to the embodiment of the present modification. In the tire case 17 shown in FIG. 17, the reinforcing cord layer 28 is covered with a covering layer 88 formed of a covering thermoplastic material 90. The coating layer 88 has a flat outer peripheral surface and constitutes the outer peripheral portion of the tire case 17. And the cushion rubber 29 and the tread 30 are formed on the coating layer 88 via a bonding agent. The outer peripheral surface 17S of the tire case 17 is subjected to a roughening process.

  Next, the manufacturing method of the modification 1 of the tire case 17 is demonstrated. FIG. 18 is an explanatory diagram for explaining the operation of covering the coated cord member wound and joined to the crown portion of the tire case of the present modified example with a coating thermoplastic material. After the reinforcing cord layer 28 is formed on the tire case 17 in the above-described procedure, as shown in FIG. 18, from the extruder 44 in which the nozzle 46 is replaced with a large-diameter nozzle 86, a molten or softened thermoplastic material for coating. 90 is discharged onto the reinforcing cord layer 28 to form a covering layer 88. At this time, it is preferable that the surface (outer peripheral surface) of the coating layer 88 is leveled by the roller 48 or the like so as to be flat. In addition, without using the extruder 44, as shown in FIG. 20, the joining surface side of the welding sheet 92 is heated with hot air blown from the outlet 99 of the hot air device 98 to be in a molten or softened state, so that the reinforcing cord layer 28 The covering layer 88 may be formed by being attached to the surface (outer peripheral surface). FIG. 20 is an explanatory diagram for explaining an operation of covering the coated cord member wound and joined to the crown portion of the tire case with a welding sheet in the present modification.

  Then, after the coating layer 88 is cooled and solidified, as shown in FIG. 19, the projection material 104 from the blast gun 102 of the blasting device 100 toward the outer circumferential surface 17 </ b> S of the tire case 17 (including the outer circumferential surface of the coating layer 88). And a roughening process for forming fine roughening irregularities 96 on the outer peripheral surface 17S is performed. FIG. 19 is a perspective view showing a state in which a roughening process is performed on the outer peripheral surface of the tire case in the present modification. After the outer peripheral surface 17S of the tire case 17 is roughened, a bonding agent is applied to the outer peripheral surface 17S, and a cushion rubber 29 and a tread rubber 30A are sequentially laminated thereon and vulcanized.

  In this modification, the outer peripheral surface 17S of the tire case 17 is made flat by covering the reinforcing cord layer 28 of the tire case 17 with the covering layer 88, but the present invention is not limited to this configuration. The cord member 26A heated against the outer peripheral surface of the crown portion 16 is pressed using the resin material of the tire case 17 as a thermoplastic material, and the reinforcing cord layer 28 is formed by being embedded while melting the thermoplastic material. It is good also as a structure which forms the above-mentioned coating layer 88 and makes the outer peripheral surface 17S of the tire case 17 flat. If a groove is formed in the crown portion 16 in advance and the cord member 26A is fitted into the groove, heating of the cord member 26A can be omitted.

  In the second embodiment described above, the tire case half 17A (case divided body) is joined to form the tire case 17. However, the present invention is not limited to this configuration, and the tire case is formed using a mold or the like. 17 may be integrally formed.

  The tire 200 of the second embodiment is a so-called tubeless tire in which an air chamber is formed between the tire 200 and the rim 20 by attaching the bead portion 12 to the rim 20, but the present invention is limited to this configuration. Instead, the tire 200 may have a complete tube shape, for example.

  In the second embodiment, the cushion rubber 29 is disposed between the tire case 17 and the tread 30. However, the present invention is not limited thereto, and the cushion rubber 29 may not be disposed.

  In the second embodiment, the covering cord member 26B is spirally wound around the crown portion 16. However, the present invention is not limited thereto, and the covering cord member 26B is discontinuous in the width direction. It is good also as a structure wound up.

In the second embodiment, the covering resin material 27 for forming the covering cord member 26B is made of a thermoplastic material, and the covering resin material 27 is heated to be melted or softened to be coated on the outer peripheral surface of the crown portion 16. Although the member 26B is welded, the present invention is not limited to this structure, and the covering cord member 26B is bonded to the outer peripheral surface of the crown portion 16 using an adhesive or the like without heating the covering resin material 27. It is good also as a structure.
The covering resin material 27 for forming the covering cord member 26B may be a thermosetting resin, and the covering cord member 26B may be bonded to the outer peripheral surface of the crown portion 16 using an adhesive or the like without being heated.
Further, the covering resin material 27 for forming the covering cord member 26B may be a thermosetting resin, and the tire case 17 may be formed of a thermoplastic resin material. In this case, the covering cord member 26B may be bonded to the outer peripheral surface of the crown portion 16 using an adhesive or the like, and the portion of the tire case 17 where the covering cord member 26B is disposed is heated to be melted or softened. The covering cord member 26 </ b> B may be welded to the outer peripheral surface of the crown portion 16 in a state.
Further, the covering resin material 27 for forming the covering cord member 26B may be made of a thermoplastic material, and the tire case 17 may be made of a thermoplastic resin material. In this case, the covering cord member 26B may be bonded to the outer peripheral surface of the crown portion 16 using an adhesive or the like, and the portion of the tire case 17 where the covering cord member 26B is disposed is heated to be melted or softened. The coating resin material 27 may be heated to a molten or softened state while the coating cord member 26 </ b> B is welded to the outer peripheral surface of the crown portion 16. In addition, when both the tire case 17 and the covering cord member 26B are heated and melted or softened, the two are mixed well, so that the bonding strength is improved. When both the resin material forming the tire case 17 and the covering resin material 27 forming the covering cord member 26B are thermoplastic materials, the same kind of thermoplastic material, particularly the same thermoplastic material, should be used. Is preferred.
For example, a rubber-coated cord (an example of a reinforcing cord member) in which the cord member 26A is covered with vulcanized rubber is wound around the outer peripheral surface of the crown portion 16 of the tire case 17 made of a resin material to form a reinforcing layer. It may be configured. In this case, as described above, the rubber-coated cord may be welded or bonded to the outer peripheral surface of the crown portion 16.

Furthermore, the order for manufacturing the tire 200 is not limited to the order of the second embodiment, and may be changed as appropriate.
The embodiments of the present invention have been described above with reference to the embodiments. However, these embodiments are merely examples, and various modifications can be made without departing from the scope of the invention. It goes without saying that the scope of rights of the present invention is not limited to these embodiments.

  Furthermore, although the specific aspect of this invention was demonstrated using 1st Embodiment and 2nd Embodiment, this invention is not limited to the above-mentioned aspect.

2A to 2C Indicator region 6 Microcapsule 8 Color former 10,200 Tire 12 Bead portion 16 Crown portion (outer peripheral portion)
18 Beadcore
20 Rim 21 Bead sheet 22 Rim flange 17 Tire case (tire frame)
24 Seal layer (seal part)
26 Reinforcement cord (reinforcement cord member)
26A cord member (reinforcing cord member)
28 Reinforcing cord layer 30 Tread D Diameter of reinforcing cord (diameter of reinforcing cord member)
L Embedding amount of reinforcement cord (embedding amount of reinforcement cord member)

Claims (4)

A pair of bead portions, a pair of side portions extending outward in the tire radial direction from each of the bead portions, and a tire radial outer end and the other of the one side portion are formed of a resin material including a thermoplastic resin. A ring portion that includes a crown portion that connects a tire radial direction outer end of the side portion,
A tire in which at least a part of the tire frame is provided with an indicator region that changes visually and irreversibly in accordance with a chemical influence from at least one of moisture, salt, and chemicals in the surrounding environment of the tire frame. 2. The tire according to claim 1, wherein the indicator region changes visually and irreversibly in accordance with a chemical change caused by at least one of moisture, salt and chemicals of the tire frame. The tire according to claim 1 or 2, wherein the indicator region is visually irreversibly changed by a coloring means.   The tire according to any one of claims 1 to 3, wherein the resin material includes a thermoplastic elastomer.