JP6001698B2 - Tire and tire manufacturing method - Google Patents

Description

  The present invention relates to a tire mounted on a rim and a method for manufacturing the tire, and more particularly to a tire at least partially formed of a thermoplastic material and a method for manufacturing the tire.

  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

  Tires using thermoplastic polymer materials are easier to manufacture and less expensive than conventional rubber tires, but they offer durability comparable to conventional rubber tires. Is required. However, the present situation is that tires excellent in durability and manufacturability have not yet been provided while using thermoplastic polymer materials.

  The present invention has been made to solve the above problems, and an object thereof is to provide a tire formed using a thermoplastic polymer material and having excellent durability and manufacturability, and a method for manufacturing the tire. It is.

(1) The tire of the present invention is a tire having an annular tire skeleton formed of a thermoplastic resin material, and the thermoplastic resin material is other than a polyester-based thermoplastic elastomer and the polyester-based thermoplastic elastomer. An acid-modified elastomer obtained by acid-modifying the above thermoplastic elastomer, or a mixture of a thermoplastic elastomer other than the polyester-based thermoplastic elastomer and an acid-modified elastomer obtained by acid-modifying the elastomer.
That is, the tire of the present invention has an annular tire skeleton formed of a specific thermoplastic resin material. The specific thermoplastic resin material includes 1) a polyester-based thermoplastic elastomer and a polyester-based heat. Combinations of acid-modified elastomers obtained by acid-modifying thermoplastic elastomers other than plastic elastomers, or 2) polyester-based thermoplastic elastomers, thermoplastic elastomers other than polyester-based thermoplastic elastomers, and polyester-based thermoplastic elastomers A combination with an acid-modified elastomer obtained by acid-modifying a thermoplastic elastomer is included.
The tire of the present invention uses an unmodified olefin thermoplastic elastomer or an unmodified styrene thermoplastic elastomer as a thermoplastic elastomer other than the polyester thermoplastic elastomer, and the unmodified olefin thermoplastic as the acid-modified elastomer. An acid-modified elastomer obtained by acid-modifying an elastomer or the unmodified styrene thermoplastic elastomer is used.

Here, the “thermoplastic elastomer” is a polymer compound having elasticity, which is a crystalline polymer that forms a hard segment with a high melting point, and an amorphous polymer that forms a soft segment with a low glass transition temperature. The thermoplastic resin material which consists of a copolymer which has this.
“Polyester-based thermoplastic elastomer” is a heat composed of a copolymer having a polyester-containing polymer comprising a hard segment having a high melting point and a non-crystalline polymer comprising a soft segment having a low glass transition temperature. It means a plastic resin material having a partial structure made of polyester in its structure.
The “thermoplastic elastomer other than the polyester-based thermoplastic elastomer” refers to a thermoplastic elastomer that does not include a partial structure made of polyester. Hereinafter, this thermoplastic elastomer is also referred to as “other thermoplastic elastomer” as appropriate.
"Acid-modified elastomer obtained by acid-modifying a thermoplastic elastomer other than a polyester-based thermoplastic elastomer" means that a compound having an acidic group is bonded to a thermoplastic elastomer (other thermoplastic elastomer) other than a polyester-based thermoplastic elastomer. Means what Hereinafter, this thermoplastic elastomer is also referred to as “acid-modified elastomer” as appropriate.
Other thermoplastic elastomers do not include acid-modified elastomers.

  Further, the thermoplastic resin in the present invention means a resin having thermoplasticity, and does not include vulcanized rubber such as conventional natural rubber and synthetic rubber.

In the present invention, the polyester-based thermoplastic elastomer contained in the thermoplastic resin material has heat resistance, impact resistance, and oil resistance, and has an advantage of excellent tensile modulus, tensile strength, and breaking strain. Furthermore, since the thermoplastic resin material contains an acid-modified elastomer, it has the above properties derived from the polyester-based thermoplastic elastomer, but does not become too elastic and has flexibility. Even when it breaks, the resin material tears, breaks, is not easily broken, and is easily stretched.
Further, since the polyester-based thermoplastic elastomer has an advantage that the change in the elastic modulus due to the temperature change is small as compared with other thermoplastic elastomers, the temperature condition selection range at the time of use of the tire can be widened. Furthermore, even when an acid-modified elastomer is used in combination, the fluidity of the thermoplastic resin material is ensured at the time of forming the tire frame, and the influence on the manufacturability is small.
For this reason, while the tire of the present invention has excellent manufacturability, the deformation and change in hardness due to temperature fluctuations in the use environment are small, and it is strong in impact, and it has an influence on the riding comfort of a vehicle equipped with the tire. In addition to reducing the number of tires, it is difficult to puncture even when the tire is damaged, and the tire can be prevented from bursting.

(2) The tire of the present invention can be configured such that the acid value of the thermoplastic resin material is 0.1 mg-CH ₃ ONa / g or more and 10 mg-CH ₃ ONa / g or less.
Thus, by making the acid value of a thermoplastic resin material into the said range, especially the increase in the melt viscosity of a thermoplastic resin material is suppressed, and since it is excellent in fluidity | liquidity, it is excellent in injection moldability. Therefore, the tire production efficiency is further improved. Therefore, it is possible to achieve both tensile properties as tire performance and manufacturability from the viewpoint of injection moldability.
The thermoplastic resin material is composed of a matrix phase composed of a polyester-based thermoplastic elastomer (hereinafter also referred to as “sea phase”) and an acid-modified elastomer, or an acid-modified elastomer and other thermoplastic elastomers (unmodified). And a dispersed island phase (hereinafter also referred to as “island phase”). In the sea-island structure, the higher the acid value, the smaller the island phase, and the lower the acid value, the larger the island phase. When the acid value of the acid-modified elastomer is in the above range, the island phase is finely dispersed in the thermoplastic resin, and impact resistance and tensile properties are improved.

(3) In the tire of the present invention, the mass (A) of the polyester-based thermoplastic elastomer in the thermoplastic resin material, and the total mass of the thermoplastic elastomer other than the polyester-based thermoplastic elastomer and the acid-modified elastomer (B )) (A: B) can be configured to be 90:10 to 50:50.
By setting the ratio of the acid-modified elastomer to the polyester-based thermoplastic elastomer in the thermoplastic resin material within the above range, the performance of the thermoplastic resin material can be sufficiently exerted, and the tensile properties as tire performance can be further improved. be able to.

(4) The tire of this invention can be comprised so that content of the polyester-type thermoplastic elastomer in the said thermoplastic resin material may be 50 mass%-95 mass%.
When the content of the polyester-based thermoplastic elastomer in the thermoplastic resin material is within the above range, the characteristics derived from the polyester-based thermoplastic elastomer can be sufficiently exhibited, and the performance of the thermoplastic resin material can be sufficiently exhibited. Further, the tensile characteristics as tire performance can be further improved.

(5) In the tire of the present invention, a reinforcing cord layer may be formed by winding a reinforcing cord member around an outer peripheral portion of a tire skeleton formed of a thermoplastic resin material. When the reinforcing cord layer is formed on the outer peripheral portion of the tire frame body, the puncture resistance and cut resistance of the tire and the circumferential rigidity of the tire (tire frame body) are improved. In addition, the improvement of the circumferential rigidity suppresses the creep of the tire frame formed of a thermoplastic material (a phenomenon in which the plastic deformation of the tire frame increases with time under a certain stress).

(6) The method for producing a tire according to the present invention includes a polyester-based thermoplastic elastomer and an acid-modified elastomer obtained by acid-modifying a thermoplastic elastomer other than the polyester-based thermoplastic elastomer or a thermoplastic other than the polyester-based thermoplastic elastomer. A tire skeleton piece forming step of forming a tire skeleton piece constituting a part of an annular tire skeleton by a thermoplastic resin material comprising an elastomer and an acid-modified elastomer mixture obtained by acid-modifying the elastomer, and the tire Including a tire frame piece joining step in which the tire frame body is formed by fusing two or more of the paired tire frame pieces by applying heat to the joint surfaces of the frame pieces.
The tire manufacturing method of the present invention uses an unmodified olefin-based thermoplastic elastomer or an unmodified styrene-based thermoplastic elastomer as the thermoplastic elastomer other than the polyester-based thermoplastic elastomer, and the acid-modified elastomer as the unmodified olefin. An acid-modified elastomer obtained by acid-modifying a thermoplastic elastomer or an unmodified styrene thermoplastic elastomer is used.
The thermoplastic resin material used in the method for producing a tire of the present invention includes a mass (A) of the polyester-based thermoplastic elastomer in the thermoplastic resin material, the unmodified olefin-based thermoplastic elastomer, and the unmodified-olefin-based material. Total mass of acid-modified elastomer formed by acid-modifying thermoplastic elastomer, or total mass of acid-modified elastomer obtained by acid-modifying unmodified styrene-based thermoplastic elastomer and unmodified styrene-based thermoplastic elastomer ( B) and the ratio (A: B) of 90:10 to 50:50, and the content of the polyester-based thermoplastic elastomer in the thermoplastic resin material is 50% by mass to 95% by mass. It can be constituted as follows.

  In the method for manufacturing a tire according to the present invention, a tire frame piece of an annular tire frame body is formed of a thermoplastic resin material. Since the thermoplastic resin material used in the production method of the present invention is excellent in tensile properties, it is excellent in the riding comfort of an automobile using the produced tire, and can improve the tear resistance and puncture resistance of the tire. .

(7) The tire manufacturing method of the present invention can be configured such that an acid value of the thermoplastic resin material is 0.1 mg-CH ₃ ONa / g or more and 10 mg-CH ₃ ONa / g or less.
As described above, by setting the acid value of the acid-modified elastomer within the above range, in particular, an increase in the melt viscosity of the thermoplastic resin material is suppressed and the fluidity is excellent, so that the injection moldability is excellent. Therefore, the tire production efficiency is improved, which is preferable from the viewpoint of environment such as energy saving.

(8) The tire manufacturing method of the present invention can be configured to include a step of injection molding using the thermoplastic resin material in the tire frame piece forming step.
Since the thermoplastic resin material used in the production method of the present invention is excellent in injection moldability, the productivity of the tire can be increased.

  As described above, according to the present invention, a tire formed using a thermoplastic polymer material and excellent in durability and manufacturability, and a method for manufacturing the tire can be provided.

(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 embeds a reinforcement cord in the crown part of a tire case using a cord heating apparatus and rollers. (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.

  First, the thermoplastic 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.

[Thermoplastic resin material]
The tire of the present invention comprises a polyester-based thermoplastic elastomer, an acid-modified elastomer obtained by acid-modifying a thermoplastic elastomer other than the polyester-based thermoplastic elastomer, or a thermoplastic elastomer other than the polyester-based thermoplastic elastomer and the elastomer. And an annular tire skeleton formed of a thermoplastic resin material containing an acid-modified elastomer mixture obtained by acid modification.
As described above, the thermoplastic resin material is a combination of 1) a polyester-based thermoplastic elastomer and an acid-modified elastomer obtained by acid-modifying a thermoplastic elastomer other than the polyester-based thermoplastic elastomer, or 2) a polyester-based material. A combination of at least a thermoplastic elastomer, a thermoplastic elastomer other than the polyester-based thermoplastic elastomer, and an acid-modified elastomer obtained by acid-modifying a thermoplastic elastomer other than the polyester-based thermoplastic elastomer is included.
The tire of the present invention uses an unmodified olefin thermoplastic elastomer or an unmodified styrene thermoplastic elastomer as a thermoplastic elastomer other than the polyester thermoplastic elastomer, and the unmodified olefin thermoplastic as the acid-modified elastomer. An acid-modified elastomer obtained by acid-modifying an elastomer or the unmodified styrene thermoplastic elastomer is used.

  In the present invention, as a thermoplastic resin material, even if any combination of the above 1) and 2) is applied, the tire skeleton formed by the resin material exhibits excellent tensile properties, Excellent manufacturability such as injection moldability. Furthermore, when the combination of the above 2) is applied, the total amount of the thermoplastic elastomer other than the polyester-based thermoplastic elastomer and the acid-modified elastomer obtained by acid-modifying the thermoplastic elastomer other than the polyester-based thermoplastic elastomer is made constant. Since the acid value can be controlled, both injection moldability and elastic modulus can be achieved.

  Hereinafter, polyester-based thermoplastic elastomers, thermoplastic elastomers other than polyester-based thermoplastic elastomers (other thermoplastic elastomers), and acid-modified elastomers obtained by acid-modifying thermoplastic elastomers other than polyester-based thermoplastic elastomers will be described. .

  As described above, the “thermoplastic elastomer” is a polymer compound having elasticity, and is composed of a crystalline polymer and a hard segment having a high melting point, and an amorphous polymer having a low glass transition temperature. The thermoplastic resin material which consists of a copolymer which has a polymer is said.

  As described above, “polyester-based thermoplastic elastomer” is a high-molecular compound having elasticity, and is a non-crystalline, low glass transition temperature soft polymer with a polyester-containing polymer that forms a hard segment having a high melting point. It is a thermoplastic resin material made of a copolymer having a polymer forming a segment, and has a partial structure made of polyester in its structure. Examples of the polyester-based thermoplastic elastomer include ester-based thermoplastic elastomer (TPC) defined in JIS K6418.

  The polyester-based thermoplastic elastomer is not particularly limited. However, a crystalline polyester constitutes a hard segment having a high melting point, and an amorphous polymer constitutes a soft segment having a low glass transition temperature. A polymer is mentioned.

An aromatic polyester can be used as the crystalline 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.
Examples of the aromatic polyester that forms the hard segment include polyethylene terephthalate, polybutylene terephthalate, polystyrene terephthalate, polyethylene naphthalate, and polybutylene naphthalate. Polybutylene terephthalate is preferable.

  One suitable aromatic polyester that forms the hard segment includes terephthalic acid and / or polybutylene terephthalate derived from dimethyl terephthalate and 1,4-butanediol, and further includes isophthalic acid, phthalic acid, naphthalene. Dicarboxylic acids such as -2,6-dicarboxylic acid, naphthalene-2,7-dicarboxylic acid, diphenyl-4,4'-dicarboxylic acid, diphenoxyethanedicarboxylic acid, 5-sulfoisophthalic acid, or ester-forming derivatives thereof Ingredients 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-cyclohexane dimeta , Cycloaliphatic diols such as tricyclodecane dimethylol, 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 It may be a polyester derived from an aromatic diol such as' -dihydroxy-p-quarterphenyl], or a copolymer polyester 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, polyfunctional oxyacid component, polyfunctional hydroxy component, and the like in a range of 5 mol% or less.

Examples of the polymer forming the soft segment include polymers selected from aliphatic polyesters and aliphatic polyethers.
Aliphatic polyethers include poly (ethylene oxide) glycol, poly (propylene oxide) glycol, poly (tetramethylene oxide) glycol, poly (hexamethylene oxide) glycol, copolymers of ethylene oxide and propylene oxide, poly (propylene oxide) Examples thereof include ethylene oxide addition polymers of glycol and copolymers 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) from the viewpoint of the elastic properties of the resulting copolymer Polybutylene adipate, polyethylene adipate and the like are preferable.

  The number average molecular weight of the polymer (polyester) forming the hard segment is preferably 300 to 6000 from the viewpoint of toughness and low temperature flexibility. Moreover, as a number average molecular weight of the polymer which forms a soft segment, 300-6000 are preferable from a viewpoint of toughness and low temperature flexibility. Furthermore, the volume 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. .

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

  As the polyester-based thermoplastic elastomer, commercially available products can be used. For example, “Hytrel” series (for example, 3046, 5557, 6347, 4047, 4767) manufactured by Toray DuPont Co., Ltd., manufactured by Toyobo Co., Ltd. "Perprene" series (for example, P30B, P40B, P40H, P55B, P70B, P150B, P250B, E450B, P150M, S1001, S2001, S5001, S6001, S9001, etc.) can be used.

  “Thermoplastic elastomers (other thermoplastic elastomers) other than the polyester-based thermoplastic elastomer” are, as described above, those which do not include a partial structure made of polyester among the thermoplastic elastomers. The other thermoplastic elastomer does not include an acid-modified elastomer obtained by acid-modifying the other thermoplastic elastomer.

Examples of other thermoplastic elastomers include olefin-based thermoplastic elastomers (unmodified olefin-based thermoplastic elastomers), styrene-based thermoplastic elastomers (unmodified styrene-based thermoplastic elastomers), and the like.
In addition, an olefin type thermoplastic elastomer and a styrene type thermoplastic elastomer say that the polymer which comprises a hard segment is an olefin and a polystyrene, respectively.

  Commercially available products can also be used as the polyolefin-based thermoplastic elastomer (unmodified olefin-based thermoplastic elastomer), and examples thereof include “Toughmer” series (for example, A1050S, A4050S, P275) manufactured by Mitsui Chemicals, Inc. It is done.

  As the polystyrene-based thermoplastic elastomer (unmodified styrene-based thermoplastic elastomer), commercially available products can also be used. For example, “Tough Tech” series (for example, H1031, H1041, H1043, H1051, H1052, manufactured by Asahi Kasei Co., Ltd.) H1053, H1082, H1141, H1221, H1272), G1641H, G1643M manufactured by Kraton, and the like.

  “To be obtained by acid-modifying a thermoplastic elastomer other than a polyester-based thermoplastic elastomer” means that an unsaturated compound having an acidic group such as a carboxylic acid group, a sulfuric acid group, or a phosphoric acid group is bonded to another thermoplastic elastomer. Say. For example, if an unsaturated carboxylic acid (generally maleic anhydride) is used as the unsaturated compound having an acidic group, the unsaturated bond site of the unsaturated carboxylic acid is bonded to the olefinic thermoplastic elastomer. A mode (for example, graft polymerization) is exemplified.

  As an elastomer obtained by acid-modifying another thermoplastic elastomer (hereinafter also referred to as “acid-modified elastomer”), for example, an unmodified olefin thermoplastic elastomer or an unmodified styrene thermoplastic elastomer has an acid group. The thing which combined the compound is mentioned.

  The compound having an acidic group is preferably a compound having a carboxylic acid group which is a weak acid group from the viewpoint of suppressing deterioration of the polyester-based thermoplastic elastomer and other thermoplastic elastomers, for example, acrylic acid, methacrylic acid, itaconic acid, Examples include crotonic acid, isocrotonic acid, and maleic acid.

Commercially available products may be used as the acid-modified olefin-based thermoplastic elastomer, and examples thereof include “Tuffmer” series (for example, MA8510, MH7007, MH7010, MH7020, MP0610, MP0620) manufactured by Mitsui Chemicals, Inc. .
Commercially available products may be used as the acid-modified styrene-based thermoplastic elastomer, and examples thereof include “Tough Tech” series manufactured by Asahi Kasei Corporation (for example, M1943, M1911, M1913, FG19181G manufactured by Kraton, etc.).

  Other thermoplastic elastomers and acid-modified elastomers are preferably hydrogenated in order to prevent the thermoplastic resin material from causing an unintended crosslinking reaction. Examples of the hydrogenated (SEBS) acid-modified elastomer include Tuftec manufactured by Asahi Kasei Corporation.

In the present invention, the acid value of the thermoplastic resin material only needs to exceed 0 mg-CH ₃ ONa / g.
Here, in this specification, the “acid value of the thermoplastic resin material” means the sodium methoxide (CH ₃ ONa) necessary for neutralizing the acid-modified site of the acid-modified elastomer with respect to the total mass of the thermoplastic resin material. When the total mass and the number of acid-modified elastomers contained in the thermoplastic resin material is one, calculated from the following formula (1), and the number of acid-modified elastomers contained in the thermoplastic resin material is two or more Is calculated from the following equation (2).

Formula (1)
[(Acid value of acid-modified elastomer A) × (total mass of acid-modified elastomer A)] / [total mass of thermoplastic resin material]

Formula (2)
[(Acid value of acid-modified elastomer A) × (total mass of acid-modified elastomer A) + (acid value of acid-modified elastomer B) × (total mass of acid-modified elastomer B) + ...] / [thermoplastic resin Total mass of material)

In this specification, the acid value of the acid-modified elastomer is the sodium methoxide used when neutralization titration is performed on the acid-modified elastomer 1 [g] using sodium methoxide (CH ₃ ONa). It is measured as the mass [mg] of (CH ₃ ONa).

From the viewpoint of injection moldability of the thermoplastic resin material, the acid value of the thermoplastic resin material is preferably 0.1 mg-CH ₃ ONa / g or more and 10 mg-CH ₃ ONa / g or less, preferably 0.1 mg- More preferably, it is CH ₃ ONa / g or more and 7 mg-CH ₃ ONa / g or less, and further preferably 0.1 mg-CH ₃ ONa / g or more and 5 mg-CH ₃ ONa / g or less.
The acid value of the thermoplastic resin material may be controlled by controlling the acid value of the acid-modified elastomer, or the mixing ratio of the other thermoplastic elastomer contained in the thermoplastic resin material and the acid-modified elastomer is controlled. You may control by.

  The thermoplastic resin material has a sea-island structure having a sea phase composed of a polyester-based thermoplastic elastomer and an island phase composed of an acid-modified elastomer and another thermoplastic elastomer (unmodified). When the interaction at the phase interface between the sea phase and the island phase is weak, the fluidity of the thermoplastic resin material increases and the injection moldability is excellent. Since the acid-modified elastomer has an acid-modified site in the molecule, the interaction with the polyester-based thermoplastic elastomer is stronger than that of the non-acid-modified elastomer.

  On the other hand, in the sea-island structure, the higher the acid value of the elastomer, the smaller the island phase, and the lower the acid value, the larger the island phase. When the acid value of the elastomer is in the above range, the island phase is finely dispersed in the thermoplastic resin, and the impact property of the thermoplastic resin material is particularly improved. Moreover, since the increase in the melt viscosity of the thermoplastic resin material can be suppressed, the injection moldability of the thermoplastic resin material is excellent. Therefore, when a tire case is produced using a thermoplastic resin material, it is not necessary to heat the thermoplastic resin to a high temperature, and therefore, overheating damage to the thermoplastic resin material can be suppressed.

  In addition, it can confirm from the photograph observation using SEM (scanning electron microscope) that the island phase of the acid-modified elastomer is finely dispersed in the thermoplastic resin.

The acid value of the acid-modified elastomer included as the thermoplastic resin material, _0mg-CH 3 ONa / preferably g or less beyond _{20mg-CH 3 ONa / g,} 0mg-CH 3 ONa / g , greater 17 mg-CH It is more preferably ₃ ONa / g or less, and more preferably 0 mg-CH ₃ ONa / g and 15 mg-CH ₃ ONa / g or less.
When the acid-modified elastomer contained in the thermoplastic resin material is one type, the acid value of the acid-modified elastomer is within the above range. The acid value of the acid-modified elastomer is preferably in the above range.

  The ratio (A: B) of the mass (A) of the polyester-based thermoplastic elastomer in the thermoplastic resin material and the total mass (B) of the other thermoplastic elastomer and the acid-modified elastomer is determined as follows. From the viewpoint of phase, it is preferably 95: 5 to 50:50. More preferably, it is 90: 10-55: 45.

In the present invention, the content of the polyester-based thermoplastic elastomer in the thermoplastic resin material is not particularly limited, but is 50% by mass to 95% by mass with respect to the total amount of the thermoplastic resin material. It is more preferable that it is 50 mass%-90 mass%.
The content of the polyester-based thermoplastic elastomer is based on the total amount of the thermoplastic resin material.
By setting it as 50 mass%-95 mass%, the characteristic of a thermoplastic resin material can fully be exhibited, and the tensile characteristic of a tire can be improved.

  The thermoplastic resin material contains various additives such as various fillers (for example, silica, calcium carbonate, clay), anti-aging agents, oils, plasticizers, colorants, weathering agents, and reinforcing materials as desired. You may let them.

  The thermoplastic resin material is a mixture of the above-described polyester-based thermoplastic elastomer and acid-modified elastomer (or other thermoplastic elastomer when the thermoplastic resin material contains another thermoplastic elastomer), if necessary. In addition, various additives can be added and melt-mixed. The mixing ratio of the polyester-based thermoplastic elastomer, the acid-modified elastomer, and the other thermoplastic elastomer is in accordance with the aforementioned ratio. The resin obtained by melt mixing can be used in the form of pellets if necessary.

  As the tensile elastic modulus (hereinafter referred to as “elastic modulus” in the present specification unless otherwise specified) as defined in JIS K7113: 1995 of the thermoplastic resin material, 100 MPa to 1000 MPa is preferable. 100 MPa to 800 MPa is more preferable, and 100 MPa to 700 MPa is particularly preferable. When the tensile elastic modulus of the thermoplastic resin material is 100 MPa 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 thermoplastic resin material is preferably 5 MPa or more, preferably 5 MPa to 20 MPa, and more preferably 5 MPa to 17 MPa. When the tensile yield strength of the thermoplastic resin material is 5 MPa or more, the thermoplastic resin material can withstand deformation against a load applied to the tire during traveling.

  The tensile yield elongation specified in JIS K7113: 1995 of the thermoplastic resin material is preferably 10% or more, preferably 10 to 70%, and more preferably 15 to 60%. When the tensile yield elongation of the polyester-based thermoplastic elastomer 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 thermoplastic 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 elongation at break of the thermoplastic 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 thermoplastic resin material, 50 ° C. or more is preferable, 50 to 150 ° C. is preferable, and 50 to 130 ° C. is more preferable. When the deflection temperature under load of the thermoplastic resin material is 50 ° C. or more, deformation of the tire frame body can be suppressed even when vulcanization is performed in the manufacture of the tire.

[Resin material constituting the reinforcing cord layer]
The tire of the present invention may have a reinforcing cord member that is wound in the circumferential direction on the outer peripheral portion of the tire frame to form a reinforcing cord layer.
Further, the reinforcing cord layer can be configured to include a resin material. In this way, when the resin material is included in the reinforcing cord layer, the difference in hardness between the tire and the reinforcing cord layer can be reduced as compared with the case where the reinforcing cord member is fixed with cushion rubber. The cord member can be adhered and fixed to the tire frame. As described above, the “resin material” 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 that can be used for the reinforcing cord layer 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.

Examples of the thermoplastic elastomer include amide-based thermoplastic elastomer (TPA), ester-based thermoplastic elastomer (TPC), olefin-based thermoplastic elastomer (TPO), and styrene-based thermoplastic elastomer (specified in JIS K6418: 2007). TPS), urethane-based thermoplastic elastomer (TPU), crosslinked thermoplastic rubber (TPV), or other thermoplastic elastomer (TPZ). Note that it is preferable to use a thermoplastic elastomer in consideration of elasticity required at the time of traveling, moldability at the time of manufacture, and the like.
Moreover, the same kind of resin material refers to forms, such as ester systems and styrene systems.

  The elastic modulus (tensile elastic modulus defined in JIS K7113) of the resin material used for the reinforcing cord layer is set within a range of 0.1 to 10 times the elastic modulus of the thermoplastic resin forming the tire frame body. It is preferable. When the elastic modulus of the resin material is 10 times or less than the elastic modulus of the thermoplastic resin material forming the tire frame body, the crown portion is not too hard and rim assembly is facilitated. Further, when the elastic modulus of the resin material is 0.1 times or more of the elastic modulus of the thermoplastic resin material forming the tire frame body, the resin constituting the reinforcing cord layer is not too soft and the in-plane shear rigidity Excellent cornering power.

[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. FIG. 1A is a perspective view showing a partial cross section of a tire according to an embodiment of the present invention. FIG. 1B is a cross-sectional view of the bead portion attached to the rim. As shown in FIG. 1, 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. 1A, 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.

Here, the tire case 17 of the present embodiment includes a polyester-based thermoplastic elastomer (“Hytrel 6347” manufactured by Toray DuPont Co., Ltd.) and an acid-modified α-olefin-based thermoplastic elastomer (manufactured by Mitsui Chemicals, Inc.). It is formed by "TAFMER MA7010") mixed material of [acid value of the thermoplastic resin material = _1.11mg-CH 3 ONa / g]. 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 thermoplastic resin material includes a polyester-based thermoplastic elastomer and an acid-modified elastomer. In particular, when the acid value of the thermoplastic resin material is _{0.1mg-CH 3 ONa / g~5mg-} CH 3 ONa / g is excellent in fluidity of the thermoplastic resin material, is suppressed increase in the melt viscosity Excellent in injection moldability.
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. 1 (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. Moreover, if the sealing property between the rim 20 can be ensured only with the thermoplastic resin material, the rubber seal layer 24 may be omitted, and a thermoplastic resin (including a thermoplastic elastomer) having an excellent sealing property is used. Also good. Examples of such thermoplastic resins include polyurethane resins, olefin resins, polystyrene resins, polyester resins, and the like, and blends of these resins with rubbers or elastomers. In addition, as the thermoplastic elastomer, thermoplastic elastomers such as polyolefin-based thermoplastic elastomers, styrene-based thermoplastic elastomers, urethane-based thermoplastic elastomers, polyamide-based thermoplastic elastomers, polyester-based thermoplastic elastomers, or combinations of these elastomers And a blend with rubber.

  As shown in FIG. 1, 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 reinforcing cord layer 28 formed by the reinforcing cord 26 will be described with reference to FIG. FIG. 2 is a cross-sectional view along the tire rotation axis showing a state where a reinforcing cord is embedded in the crown portion of the tire case of the tire of the first embodiment. As shown in FIG. 2, 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. 2 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. 2, 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.

Hereinafter, the tire manufacturing method of the present invention will be described.
(Tire case molding process)
First, tire case halves supported by a thin metal support ring face each other. Next, a joining mold (not shown) is installed so as to be in contact with the outer peripheral surface of the abutting portion of the tire case half. Here, the said joining metal mold | die is comprised so that the periphery of the junction part (butting part) of the tire case half body A may be pressed with a predetermined pressure. Next, the periphery of the joint portion of the tire case half is pressed at a temperature equal to or higher than the melting point of the thermoplastic resin material constituting the tire case. When the joining portion of the tire case half is heated and pressurized by the joining mold, the joining portion is melted and the tire case halves are fused together, and the tire case 17 is formed by integrating these members. In the present embodiment, the joining portion of the tire case half is heated using a joining mold, but the present invention is not limited to this. For example, the joining portion is heated by a separately provided high-frequency heater or the like. Or softened or melted beforehand by hot air, infrared irradiation, etc., and pressed by a joining mold. The tire case halves may be joined.

(Reinforcement cord member winding process)
Next, the reinforcing cord winding process will be described with reference to FIG. FIG. 3 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. 3, 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. 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 melted or softened polyamide-based thermoplastic elastomer. )). 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 72 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.

  In this step, first, 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 72. 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 polyester-based thermoplastic elastomer 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.

  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.

(Function)
In the tire 10 of the present embodiment, the tire case 17 is formed of the thermoplastic resin material, and thus has excellent tensile elastic modulus and breakability. Furthermore, since the structure of the tire 10 of the present embodiment can be simplified by using a thermoplastic resin material, the weight is lighter than rubber used in conventional tires. For this reason, if the tire 10 of this embodiment is applied to a motor vehicle, it can reduce in weight and can suppress a fuel consumption.
In particular, when the acid value of the thermoplastic resin material used for forming the tire case 17 is 0.1 mg-CH ₃ ONa / g or more and 10 mg-CH ₃ ONa / g or less, the polyester-based thermoplastic elastomer is used as the sea phase. The island phase is finely dispersed in the thermoplastic resin material having a sea-island structure in which the acid-modified elastomer or the acid-modified elastomer and other thermoplastic elastomer (unmodified) are used as the island phase. , Tensile properties are improved.

  The acid-modified elastomer contained in the thermoplastic resin material has high adhesion to the reinforcing cord 26. For this reason, the phenomenon (air entering) in which air remains around the reinforcing cord 26 in the reinforcing cord winding step can be suppressed. If the adhesiveness to the reinforcement cord 26 is high and the entry of air into the periphery of the reinforcement cord member is suppressed, it is possible to effectively suppress the movement of the reinforcement cord 26 due to an input during traveling. 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 addition, since the thermoplastic resin material contains an acid-modified elastomer, the thermoplastic resin material is excellent in fluidity, and by setting the modification rate of the acid-modified elastomer within the above-described range, it is particularly excellent in injection moldability. As a result, the tire production efficiency is improved, energy saving is achieved, and the environment is preferable.

  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 made 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. 1). 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. 2, 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 this way, when the reinforcing cord layer 28 is made of a thermoplastic resin material containing a polyester-based thermoplastic elastomer, the tire case 17 and the reinforcing cord layer 28 are compared with the case where the reinforcing cord 26 is fixed with cushion rubber. Therefore, the reinforcing cord 26 can be further adhered and fixed to the tire case 17. Thereby, the above-mentioned air entering can be prevented effectively, and it can control effectively that a reinforcement cord member moves at the time of driving.
Further, when the reinforcing cord 26 is a steel cord, the reinforcing cord 26 can be easily separated and recovered from the thermoplastic resin material by heating at the time of disposal of the tire, which is advantageous in terms of recyclability of the tire 10. .
Further, since the polyester-based thermoplastic elastomer has a lower loss factor (Tan δ) than vulcanized rubber, if the reinforcing cord layer 28 contains a large amount of the polyester-based thermoplastic elastomer, the rolling property of the tire can be improved. it can.
Furthermore, the polyester-based thermoplastic elastomer has an advantage that the in-plane shear rigidity is larger than that of the vulcanized rubber, and the stability and wear resistance during running of the tire are excellent.

In addition, since the tread 30 that is in contact with the road surface is made of a rubber material that is more wear resistant than the polyester-based thermoplastic elastomer, 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 a seal layer 24 made of a rubber material having a sealing property rather than a polyester-based thermoplastic elastomer is provided at a portion of the bead portion 12 that contacts the rim 20, the space between the tire 10 and the rim 20 is provided. Sealability 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 an amide elastomer. Further, the rim fit property is improved by providing the seal layer 24.

  In the first embodiment, the reinforcing cord 26 is heated and the polyester-based thermoplastic elastomer at 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 26 is reinforced. The hot cord generator may be used without heating the cord 26, and the reinforcing cord 26 may be buried in the crown portion 16 after the outer peripheral surface of the crown portion 16 in which the reinforcing cord 26 is buried is heated.

  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 is directly heated by radiant heat (for example, infrared rays). Also good.

  Further, 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 is configured in this manner. However, the present invention may be configured to forcibly cool and solidify the melted or softened portion of the thermoplastic resin material by directly blowing cold air to the melted or softened portion of the thermoplastic resin material.

  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 the tire case 17. When the covering reinforcing cord is wound around the crown portion 16 of the tire case 17, the thermoplastic resin material covered with the reinforcing cord 26 is also heated, thereby effectively suppressing air entry when embedded in the crown portion 16. it can.

  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 has this configuration. It is not limited and a perfect tube shape may be sufficient.

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 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. Similar to the first embodiment, the tire according to the present embodiment has a cross-sectional shape substantially similar to that of a conventional general rubber pneumatic tire. For this reason, in the following figures, the same number is attached | subjected about the structure similar to the said 1st Embodiment. FIG. 10A is a cross-sectional view along the tire width direction of the tire of the second embodiment, and FIG. 10B is a bead portion in a state where a rim is fitted to the tire of the second embodiment. It is an enlarged view of a section along the tire width direction. FIG. 11 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 according to the second embodiment, the tire case 17 includes a thermoplastic resin material (polyester-based thermoplastic elastomer (“Hytrel 6347” manufactured by Toray DuPont Co., Ltd.)) and acid modification, as in the first embodiment described above. And a mixed material with an α-olefin-based thermoplastic elastomer (“Tuffmer MA7010” manufactured by Mitsui Chemicals, Inc.); acid value of thermoplastic resin material = 1.11 mg-CH ₃ ONa / g]. In the present embodiment, as shown in FIGS. 4 and 5, the tire 200 includes a reinforcing cord layer 28 (indicated by a broken line in FIG. 11) formed by winding a covering cord member 26 </ b> B around the crown portion 16 in the circumferential direction. Are stacked). 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 outer peripheral surface of the reinforcing cord layer 28 is included in the outer peripheral surface 17S of the tire case 17.

  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.

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 this embodiment, as the coating resin material 27, the same kind of material as the thermoplastic resin material constituting the tire case 17 (“Hytrel 6347” manufactured by Toray DuPont Co., Ltd.), and acid-modified α - olefinic thermoplastic elastomer (Mitsui Chemicals Co., Ltd. "TAFMER MA7010") mixed material of; heat = acid value of the thermoplastic resin material _1.11mg-CH 3 ONa / g] is used.

  Further, as shown in FIG. 5, the coated cord member 26B has a substantially trapezoidal cross-sectional shape. In the following description, the upper surface (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 (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. 5, 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.

Next, the manufacturing method of the tire of this embodiment is demonstrated.
(Skeleton formation process)
(1) First, the tire case half body 17A is formed in the same manner as in the first embodiment described above, and this is heated and pressed by a joining mold to form the tire case 17.

(Reinforcement cord member winding process)
(2) 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. 3 of the first embodiment described above, the cord member 26A is coated on the reel 58. A material in which a covering cord member 26B having a substantially trapezoidal cross-section covered with a resin material 27 (a thermoplastic material in the present embodiment) is wound is used.

  First, 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 72. The coated cord member 26B unwound from the reel 58 is fed into the 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 equal to or higher than the melting point of the coating resin material 27). And 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.

(Roughening process)
(3) Next, with a blasting device not shown, the projection material is injected onto the outer peripheral surface 17S at a high speed while rotating the tire case 17 side (arrow R direction) toward the outer peripheral surface 17S of the tire case 17. To do. The ejected projection material collides with the outer peripheral surface 17S, and fine roughening unevenness 96 having an arithmetic average roughness Ra of 0.05 mm or more is formed on the outer peripheral surface 17S.
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.

(Lamination process)
(4) 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.).

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

(Vulcanization process)
(6) 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.
In the vulcanization process, it is necessary to increase the temperature to a temperature (90 ° C. to 140 ° C.) at which the cushion rubber 29 can be vulcanized, and when only a thermoplastic resin other than the polyester-based thermoplastic elastomer is used for the tire case, The temperature rise at the time of vulcanization may cause the tire case 17 to bend and thus affect the tire formation maintenance. In this respect, the polyester-based thermoplastic elastomer has a higher deflection temperature under load than other thermoplastic elastomers, so that the tire shape maintainability can be further improved and the tire productivity can also be improved. .

(7) When the seal layer 24 made of a soft material softer than the resin material is bonded to the bead portion 12 of the tire case 17 using an adhesive or the like, the tire 200 is completed.

(8) Finally, the diameter of the tire support portion 40 is reduced, the completed tire 200 is removed from the tire support portion 40, the internal tire inner surface support ring 43 is bent and deformed, and is removed from the tire.

(Function)
In the tire 200 of the present embodiment, since the tire case 17 is formed of the thermoplastic resin material, the tire case 17 is excellent in heat resistance, tensile elastic modulus, tensile strength, and breaking strain. Moreover, since the structure of the tire 10 of the present embodiment can be simplified by using a thermoplastic resin material, the weight is lighter than rubber used in conventional tires. For this reason, the tire 200 of this embodiment has high friction resistance and durability.

In addition, the polyester-based thermoplastic elastomer used as one of the thermoplastic resin materials has high adhesiveness to the covering cord member 26 </ b> B constituting the reinforcing cord layer 28.
When the reinforcing cord layer 28 is configured to include the covering cord member 26B as described above, the hardness of the tire case 17 and the reinforcing cord layer 28 compared to the case where the cord member 26A is simply fixed by the cushion rubber 29. Therefore, the coated cord member 26 </ b> B can be further adhered and fixed to the tire case 17. Thereby, air entry can be effectively prevented, and the reinforcement cord member can be effectively suppressed from moving during traveling.
Further, when the cord member 26A is a steel cord in particular, the cord member 26A can be easily separated and collected from the coated cord member 26B by heating at the time of disposal of the tire, which is advantageous in terms of recyclability of the tire 200. is there. Further, since the polyester-based thermoplastic elastomer has a lower loss factor (Tan δ) than vulcanized rubber, if the reinforcing cord layer 28 contains a large amount of the polyester-based thermoplastic elastomer, the rolling property of the tire can be improved. it can. Furthermore, the polyester-based thermoplastic elastomer has an advantage that the in-plane shear rigidity is larger than that of the vulcanized rubber, and the stability and wear resistance during running of the tire are excellent.

  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. Further, since the resin material forming the tire case 17 is dug up by the collision of the projection material, 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 case is collided with the projection (gap 28A) to roughen the periphery of the recess (concave wall, bottom), so that the tire case 17 The bonding strength between the cushion rubber 29 and the cushion rubber 29 can be ensured.

  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 the present embodiment, the outer peripheral surface 17S of the tire case 17 is configured to be uneven, but the present invention is not limited to this, and the outer peripheral surface 17S is formed flat as in Modification 1 of the tire case 17 shown in FIG. It is good also as a structure. Below, the modification 1 of the tire case 17 which formed the outer peripheral surface 17S flatly is demonstrated.

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.
In addition, the tire case 17 may be formed with a reinforcing cord layer so as to cover the covering cord member wound and joined to the crown portion of the tire case with a covering thermoplastic material. In this case, the coating thermoplastic material can be ejected onto the reinforcing cord layer 28 in the molten or softened state to form the coating layer. Further, without using an extruder, the welding sheet may be heated to be in a molten or softened state and attached to the surface (outer peripheral surface) of the reinforcing cord layer 28 to form a coating layer.

  In 2nd Embodiment, it was set as the structure which joins a case division body (tire case half body 17A) and forms the tire case 17, However, This invention is not restricted to this structure, The tire case 17 using a metal mold | die etc. May be formed integrally.

  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 has this configuration. Without being limited, the tire 200 may be, for example, a complete tube shape.

  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 to this, and the cushion rubber 29 may not be disposed.

  In the second embodiment described above, the covering cord member 26B is spirally wound around the crown portion 16, but 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 so that it may become.

In the second embodiment, the coating resin material 27 forming the coating cord member 26B is made of a thermoplastic material, and the coating resin material 27 is heated to be melted or softened so that the outer peripheral surface of the crown portion 16 is coated. Although the cord member 26B is welded, the present invention is not limited to this configuration, 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 coating resin material 27. It is good also as composition to do.
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 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.
Still 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 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.

Further, the outer peripheral surface 17S of the tire case 17 subjected to the roughening treatment is activated by corona treatment, plasma treatment, or the like to activate the surface of the outer peripheral surface 17S and increase the hydrophilicity, and then apply an adhesive. Also good.

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 the present invention is not limited to these embodiments.

  As mentioned above, 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.

As shown in the first embodiment, the tire of the present invention can be configured as follows.
(1-1) The tire of the present invention is a cross-sectional view along the axial direction of the tire skeleton, and at least a part of the reinforcing cord member on the outer periphery of the tire skeleton formed of the thermoplastic resin material according to the present invention. Can be configured to be embedded.
As described above, when a part of the reinforcing cord member is embedded in the outer peripheral portion of the tire frame body, it is possible to further suppress a phenomenon (air entering) in which air remains around the cord when the reinforcing cord member is wound. When the entry of air into the periphery of the reinforcement cord member is suppressed, the movement of the reinforcement cord member due to input during traveling is suppressed. Thereby, for example, when the tire constituent member is provided on the outer peripheral portion of the tire skeleton body so as to cover the entire reinforcement cord member, the movement of the reinforcement cord member is suppressed. ) Is prevented from being peeled off and the durability is improved.

(1-2) The tire of the present invention may be provided with a tread formed of a material having more wear resistance than the thermoplastic resin material on the radially outer side of the reinforcing cord layer.
Thus, the abrasion resistance of the tire can be further improved by configuring the tread that contacts the road surface with a material that is more resistant to abrasion than the thermoplastic resin material.

(1-3) In the tire according to the present invention, in a cross-sectional view along the axial direction of the tire frame body, a diameter 1/5 or more of the reinforcing cord member is embedded in the outer peripheral portion of the tire frame body along the circumferential direction. Can be made.
Thus, when 1/5 or more of the diameter of the reinforcing cord member is embedded in the outer peripheral portion of the tire frame body in a cross-sectional view along the axial direction of the tire frame body, it is effective to enter the air around the reinforcing cord member It is possible to suppress the movement of the reinforcing cord member due to an input during traveling.

(1-4) In the tire according to the present invention, the tire frame has a bead portion in contact with a rim bead sheet and a rim flange on a radially inner side, and an annular bead core made of a metal material is embedded in the bead portion. Can be configured.
Thus, by providing a bead portion that is a fitting portion with the rim in the tire frame body, and further by embedding an annular bead core made of a metal material in this bead portion, it is the same as a conventional rubber pneumatic tire. In addition, the tire frame (that is, the tire) can be firmly held against the rim.

(1-5) In the tire of the present invention, a seal portion made of a material having a higher sealing property (adhesion with the rim) than the thermoplastic resin material can be provided at a portion where the bead portion contacts the rim.
Thus, by providing a seal portion made of a material having a higher sealing property than the thermoplastic resin material at the contact portion between the tire frame body and the rim, adhesion between the tire (tire frame body) and the rim can be improved. Can be improved. Thereby, compared with the case where only a rim | limb and a thermoplastic resin material are used, the air leak in a tire can be suppressed further. Moreover, the rim fit property of a tire can also be improved by providing the said seal part.

(1-6) The tire manufacturing method of the present invention includes a tire skeleton piece forming step of forming a tire skeleton piece constituting a part of an annular tire skeleton by a thermoplastic resin material containing at least a polyester-based thermoplastic elastomer. A tire frame piece joining step in which two or more paired tire frame pieces are fused to form a tire frame body by applying heat to the joint surfaces of the tire frame pieces, and an outer peripheral portion of the tire frame body. The reinforcing cord member is wound around the reinforcing cord member in the circumferential direction to form a reinforcing cord layer.

(1-7) The tire manufacturing method of the present invention is configured such that, in the tire frame piece bonding step, the bonding surface of the tire frame piece is heated to a temperature equal to or higher than the melting point of the thermoplastic resin material constituting the tire frame piece. can do.
As described above, when the joining surface of the divided body is heated to a temperature equal to or higher than the melting point of the thermoplastic resin material constituting the tire frame piece, the tire frame pieces can be sufficiently fused with each other. The productivity of the tire can be increased while improving.

(1-8) In the tire manufacturing method of the present invention, in the reinforcing cord member winding step, the outer periphery of the tire frame body formed in the tire frame piece joining step is melted or softened. At least a part of the reinforcing cord member may be wound around the outer periphery of the tire frame body.
In this way, at least a part of the reinforcing cord member was embedded while melting or softening the outer peripheral portion of the tire frame body, and the reinforcing cord member was wound around the outer peripheral portion of the tire frame body. At least a part of the reinforcing cord member can be welded to the molten or softened thermoplastic resin material. Thereby, the air entering between the outer peripheral part of the tire frame and the reinforcing cord member can be further suppressed in a cross-sectional view along the axial direction of the tire frame. Moreover, when the portion in which the reinforcing cord member is embedded is cooled and solidified, the fixing degree of the reinforcing cord member embedded in the tire frame body is improved.

(1-9) In the tire manufacturing method of the present invention, in the reinforcing cord member winding step, the tire skeleton has a diameter of 1/5 or more of the diameter of the reinforcing cord in a cross-sectional view along the axial direction of the tire skeleton body. It can be configured to be embedded in the outer periphery of the body.
As described above, when the reinforcing cord member is embedded in the outer peripheral portion of the tire frame body by 1/5 or more of the diameter in a cross-sectional view along the axial direction of the tire frame body, it is effective for air to enter the periphery of the reinforcement cord at the time of manufacture. In addition, the embedded reinforcing cord member can be made difficult to come off from the tire frame body.

(1-10) The tire manufacturing method of the present invention can be configured so that the heated reinforcing cord member is embedded in the tire frame body in the reinforcing cord member winding step.
Thus, in the reinforcing cord winding step, when the reinforcing cord member is embedded in the tire frame body while heating, the contact portion melts or softens when the heated reinforcing cord member contacts the outer periphery of the tire frame body. Therefore, the reinforcing cord member can be easily embedded in the outer peripheral portion of the tire frame body.

(1-11) The tire manufacturing method of the present invention can be configured such that, in the cord member winding step, a portion of the outer periphery of the tire frame body where the reinforcing cord member is embedded is heated.
Thus, by heating the portion where the reinforcement cord member is embedded in the outer peripheral portion of the tire frame body, the heated portion of the tire frame body is melted or softened, so that the reinforcement cord member is easily embedded.

(1-12) In the tire manufacturing method of the present invention, in the cord member winding step, the reinforcing cord member is pressed against the outer peripheral portion of the tire skeleton body in the circumferential direction of the outer peripheral portion of the tire skeleton body. The reinforcing cord member can be configured to be spirally wound.
As described above, when the reinforcing cord member is spirally wound while pressing the reinforcing cord member against the outer peripheral portion of the tire frame body, the amount of the reinforcing cord member embedded in the outer peripheral portion of the tire frame body can be adjusted. it can.

(1-13) According to the manufacturing method of the present invention, in the cord member winding step, after the reinforcing cord member is wound around the tire frame body, the outer peripheral portion of the tire frame body is melted or softened. Can be configured to cool.
In this way, after the reinforcing cord member is embedded, the melted or softened portion of the outer periphery of the tire frame body is forcibly cooled to naturally cool the melted or softened portion of the outer periphery of the tire frame body. Faster and faster cooling and solidification. By cooling the tire outer peripheral portion faster than natural cooling, it is possible to suppress deformation of the outer peripheral portion of the tire frame body and to suppress movement of the reinforcing cord member.

In addition, as described in the second embodiment, the tire of the present invention can be configured as follows.
(2-1) The method for manufacturing a tire according to the present invention further includes a roughening treatment step in which a particulate projection material is collided with the outer peripheral surface of the tire frame body, and the outer peripheral surface of the tire frame body is roughened. A laminating step of laminating a tire constituent rubber member on the roughened outer peripheral surface via a bonding agent.
As described above, when the roughening treatment step is provided, the particulate projection material collides with the outer peripheral surface of the annular tire skeleton formed using the thermoplastic resin material, and fine rough unevenness is formed on the outer peripheral surface. Is formed. In addition, the process which makes a projection material collide with the outer peripheral surface of a tire frame body and forms fine roughening unevenness | corrugation is called roughening process. Thereafter, a tire constituting rubber member is laminated on the outer peripheral surface subjected to the roughening treatment via a bonding agent. Here, since the outer peripheral surface of the tire frame is roughened when integrating the tire frame and the tire constituent rubber member, the bondability (adhesiveness) is improved by the anchor effect. In addition, since the resin material forming the tire frame is dug up by the collision of the projection material, the wettability of the outer peripheral surface is improved. Thereby, the bonding agent is held in a uniform applied state on the outer peripheral surface of the tire frame body, and the bonding strength between the tire frame body and the tire constituting rubber member can be ensured.

(2-2) In the tire of the present invention, at least a part of the outer peripheral surface of the tire frame body is an uneven portion, and the uneven portion can be prepared by performing a roughening treatment in the roughening treatment step.
As described above, even when at least a part of the outer peripheral surface of the tire skeleton is an uneven portion, the projection material is collided with the uneven portion to roughen the periphery of the recessed portion (concave wall, concave bottom), and the tire Bonding strength between the skeleton body and the tire constituting rubber member can be ensured.

(2-3) In the tire according to the present invention, the outer peripheral portion of the tire frame body is formed of a reinforcing layer that forms the uneven portion on the outer peripheral surface, and the reinforcing layer forms the tire frame body. Can be configured by winding a coated cord member formed by coating a reinforcing cord with the same or separate resin material in the circumferential direction of the tire frame body.
Thus, the circumferential direction rigidity of a tire frame body can be improved by constituting the perimeter part of a tire frame body with the reinforcement layer constituted by winding a covering cord member in the circumferential direction of a tire frame body.

(2-4) The tire of this invention can use a thermoplastic resin material for the resin material which comprises the said covering cord member.
In this way, by using a thermoplastic material having thermoplasticity as the resin material constituting the coated cord member, it becomes easier to manufacture and recycle compared to the case where a thermosetting material is used as the resin material. It becomes easy to do.

(2-5) The tire of the present invention can be configured to roughen a wider area than the laminated area of the tire constituent rubber members in the roughening treatment step.
As described above, in the roughening treatment step, when the roughening treatment is performed on a region wider than the lamination region of the tire constituent rubber members, the bonding strength between the tire frame body and the tire constituent rubber members can be reliably ensured.

(2-6) The tire of the present invention can be configured to roughen the outer peripheral surface so that the arithmetic average roughness Ra is 0.05 mm or more in the roughening treatment step.
As described above, when the outer peripheral surface of the tire frame body is roughened so that the arithmetic average roughness Ra is 0.05 mm or more in the roughening treatment step, the outer peripheral surface subjected to the roughening treatment, for example, via a bonding agent, When the unvulcanized or semi-cured tire component rubber member is laminated and vulcanized, the rubber of the tire component rubber member can be poured to the bottom of the roughened irregularities formed by the roughening treatment. When the rubber of the tire constituent rubber member is poured into the bottom of the roughened unevenness, a sufficient anchor effect is exerted between the outer peripheral surface and the tire constituent rubber member, and the bonding strength between the tire skeleton and the tire constituent rubber member Can be improved.

(2-7) In the tire of the present invention, unvulcanized or semi-vulcanized rubber can be used as the tire constituent rubber member.
As described above, when an unvulcanized or semi-vulcanized rubber is used as the tire constituent rubber member, when the tire constituent rubber member is vulcanized, a roughening process formed on the outer peripheral surface of the tire frame body. Rubber flows into the uneven surface. When the vulcanization is completed, the anchor effect is exhibited by the rubber (vulcanized) that has flowed into the roughened unevenness, and the bonding strength between the tire frame body and the tire constituting rubber member can be improved.

  In addition, vulcanized means the state that has reached the degree of vulcanization required for the final product, and the semi-vulcanized state has a higher degree of vulcanization than the unvulcanized state, but is required for the final product. This means that the degree of vulcanization is not reached.

(2-8) The tire of the present invention is an annular tire skeleton formed by using the thermoplastic resin material according to the present invention, and having the outer peripheral surface roughened by colliding a particulate projection material with the outer peripheral surface. And a tire constituting rubber member laminated on the roughened outer peripheral surface via a bonding agent.
As described above, when the roughened tire skeleton body is used, the bonding strength between the tire skeleton body and the tire constituting rubber member can be improved by the anchor effect. Moreover, since the outer peripheral surface is roughened, the wettability of the bonding agent is good. As a result, the bonding agent is held in a uniform application state on the outer peripheral surface of the tire frame body, the bonding strength between the tire frame body and the tire component rubber member is ensured, and the tire frame body and the tire component rubber member are separated. Can be suppressed.

Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to this.
First. In accordance with the first embodiment described above, tires of examples and comparative examples were molded. At this time, the materials described in Table 1 below were used as materials for forming the tire case. In addition, a sheet-like sample piece of 127 mm × 12.7 mm and a thickness of 1.6 mm, which has the same component composition as the tire case formed under the same conditions as in the examples and comparative examples, was prepared, injection moldability, tensile strength, The breaking elongation, tensile elastic modulus, and breaking state were evaluated. The results are shown in Table 1.
Moreover, the preparation method of each sample piece, each evaluation method, and evaluation conditions are as follows.

<Preparation of sample piece>
1. Polyester-based thermoplastic elastomer "Hytrel 6347" manufactured by Toray DuPont
2. Polyamide-based thermoplastic elastomer "UBESTA XPA9055X1" manufactured by Ube Industries, Ltd.
3. α-Olefin Thermoplastic Elastomer 1) “Tuffmer MA8510” manufactured by Mitsui Chemicals, Inc.
2) "Tuffmer MH7007" manufactured by Mitsui Chemicals, Inc.
3) “Tuffmer MH7010” manufactured by Mitsui Chemicals, Inc.
4) “Tuffmer MH7020” manufactured by Mitsui Chemicals, Inc.
5) “Tuffmer A1050S” manufactured by Mitsui Chemicals, Inc.
4). Styrenic thermoplastic elastomer [fully hydrogenated type (SEBS)]
1) "Tuftec H1052" manufactured by Asahi Kasei Corporation
2) "Tuftec M1943" manufactured by Asahi Kasei Corporation

  The thermoplastic elastomer was mixed (mass basis) with the composition shown in Table 1, and kneaded by a LABOPLASTOMILL 50MR twin screw extruder manufactured by Toyo Seiki Seisakusho Co., Ltd. to obtain pellets.

Next, using the obtained pellets as a molding material, a 127 mm × 12.7 mm, 1.6 mm thick mold was subjected to injection molding under the following conditions to obtain a sample piece.
-Injection molding machine: SE30D, manufactured by Sumitomo Heavy Industries, Ltd.-Molding temperature (temperature of thermoplastic resin): 200 ° C to 235 ° C
-Mold temperature: 50 ° C-70 ° C
Each obtained sample piece was punched out to prepare a dumbbell-shaped test piece (No. 5 type test piece) defined in JIS K6251-1993: 1993.
In addition, for each pellet of Comparative Examples 1 and 4 that could not be injection molded under the above conditions, by using an electric heating press manufactured by Kodaira Manufacturing Co., Ltd., by heating the pellet at 200 ° C. and 12 MPa for 5 minutes, Hot pressing was performed to obtain a sample piece of 120 mm × 120 mm and a thickness of 2 mm.

<Measurement of acid value of thermoplastic resin material>
The acid value of the thermoplastic resin material, examples and respective elastomer used in Comparative Example, sodium methoxide, sodium methoxide, which is used when performing the neutralization titration using _{(CH 3 ONa) (CH 3} ONa ) Based on the formula (1) or (2). The results are shown in Table 1.

<Evaluation>
1. Evaluation of tensile properties (tensile strength, elongation at break, tensile modulus, and rupture state) Using the obtained test piece, tensile strength, elongation at break, tensile modulus, and rupture state were as follows. evaluated. The results are shown in Table 1 below.
Tensile strength, elongation at break and tensile modulus were obtained by using a Shimadzu autograph “AGS-J (5KN)” manufactured by Shimadzu Corporation and a JIS No. 5 dumbbell to pull a sample piece at a tensile speed of 200 mm / min. Was measured.
The fracture state was evaluated based on the following evaluation criteria by visually observing the fracture surface of each test piece.
-Evaluation criteria-
○: The sample piece was broken by ductile fracture.
Δ: The sample piece was broken by layered fracture.
X: The sample piece was broken by brittle fracture.

2. Evaluation of injection moldability Fluidity evaluation [MFR (g / 10 min, 230 ° C.)] and injection moldability evaluation For each pellet of Examples and Comparative Examples, a semi-melt indexer type 2A manufactured by Toyo Seiki Seisakusho Co., Ltd. The flowability (MFR) was measured using a load of 21.18N, 49.03N, or 98.07N based on ASTM A1238 (Method B).
The measurement was started with a small load (21.18N), and when the MFR could not be measured under these conditions, the measurement was performed with a larger load. Table 1 shows “−” for those in which measurement was not started after 3 minutes had elapsed after the start of measurement.
Further, using SE30D manufactured by Sumitomo Heavy Industries, Ltd., the evaluation of injection moldability under the conditions of a molding temperature of 200 ° C. to 235 ° C. and a mold temperature of 50 ° C. to 70 ° C. is shown in Table 1. Table 1 shows the case where injection molding was possible under the above conditions as ◯, and the case where injection molding was not possible under the conditions as Δ.

  When the evaluation of the injection moldability is ◯, it indicates that the injection moldability has no practical problem when producing a tire. The results are shown in Table 1 below.

  As shown in Table 1, the sample pieces produced in each example are good in both tensile properties and fractured state in comparison with the sample pieces produced in the comparative examples. It can be seen that it is excellent in injection moldability. This indicates that a tire manufactured using a tire case formed using the same thermoplastic resin material as the sample pieces shown in Examples 1 to 12 has durability and excellent manufacturability. .

  In addition, when the drum driving | running | working test was done about each tire obtained by the Example and the comparative example, the safety | security on driving | running | working did not have any problem.

10, 200 Tire 12 Bead part 16 Crown part (outer peripheral part)
18 Bead core 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 (6)

A tire having an annular tire skeleton formed of a thermoplastic resin material,
The thermoplastic resin material is a polyester-based thermoplastic elastomer;
An acid-modified elastomer obtained by acid-modifying an unmodified olefin-based thermoplastic elastomer other than the polyester-based thermoplastic elastomer, or an acid obtained by acid-modifying the unmodified olefin-based thermoplastic elastomer and the unmodified olefin-based thermoplastic elastomer. A mixture of modified elastomers, or an acid-modified elastomer obtained by acid-modifying an unmodified styrene-based thermoplastic elastomer other than the polyester-based thermoplastic elastomer, or the unmodified styrene-based thermoplastic elastomer and the unmodified styrene-based thermoplastic elastomer only containing a mixture of the acid-modified elastomer obtained by acid modification, and
The mass (A) of the polyester-based thermoplastic elastomer in the thermoplastic resin material and the total of the unmodified olefin-based thermoplastic elastomer and the acid-modified elastomer obtained by acid-modifying the unmodified olefin-based thermoplastic elastomer, or The ratio (A: B) of the total mass (B) that is the total of the unmodified styrene thermoplastic elastomer and the acid-modified elastomer obtained by acid-modifying the unmodified styrene thermoplastic elastomer is 90:10. 50: a 50, the content of the polyester-based thermoplastic elastomer of the thermoplastic resin material is a 50 wt% to 95 wt%, tire. The tire according to the thermal acid value of the thermoplastic resin material, _0.1mg-CH 3 ONa / g or higher 10 _mg-CH claim 1 is 3 ONa / g or less. The tire according to claim 1 or 2 , further comprising a reinforcing cord member that is wound around an outer peripheral portion of the tire frame body in a circumferential direction to form a reinforcing cord layer. At least a polyester-based thermoplastic elastomer and an acid-modified elastomer obtained by acid-modifying an unmodified olefin-based thermoplastic elastomer other than the polyester-based thermoplastic elastomer, or the unmodified olefin-based thermoplastic elastomer and the unmodified olefin-based heat A mixture of acid-modified elastomers obtained by acid-modifying a plastic elastomer, an acid-modified elastomer obtained by acid-modifying an unmodified styrene-based thermoplastic elastomer other than the polyester-based thermoplastic elastomer, or the unmodified styrene-based thermoplastic elastomer And an acid-modified elastomer mixture obtained by acid-modifying the unmodified styrene-based thermoplastic elastomer , and a mass (A) of the polyester-based thermoplastic elastomer in the thermoplastic resin material, , The total of the unmodified olefin thermoplastic elastomer and the acid-modified elastomer obtained by acid-modifying the unmodified olefin thermoplastic elastomer, or the unmodified styrene thermoplastic elastomer and the unmodified styrene thermoplastic elastomer The ratio (A: B) of the total mass (B) that is the total of the acid-modified elastomers modified is 90:10 to 50:50, and the polyester-based thermoplastic elastomer in the thermoplastic resin material A tire skeleton piece forming step of forming a tire skeleton piece constituting a part of the annular tire skeleton by a thermoplastic resin material having a content of 50 mass% to 95 mass% ,
A tire manufacturing method including a tire skeleton piece joining step of forming a tire skeleton body by applying heat to a joining portion of the tire skeleton pieces to fuse two or more paired tire skeleton pieces together. The acid value of the thermoplastic resin material, _0.1mg-CH 3 ONa / g or more _10mg-CH 3 ONa / tire manufacturing method according to claim 4 g or less. The tire manufacturing method according to claim 5 , wherein the tire frame piece forming step includes a step of injection molding using the thermoplastic resin material.