JP2018058541A - Non-pneumatic tire and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-pneumatic tire which inhibits peeling between a reinforcement layer and other members to improve the durability, and to provide a manufacturing method of the non-pneumatic tire.SOLUTION: An non-pneumatic tire T includes a support structure SS comprising: an inner annular part 1; an outer annular part 2 which is provided in a concentric circular shape at the outer side of the inner annular part 1; and a connection part 3 which connects the inner annular part 1 to the outer annular part 2. The inner annular part 1 or outer annular part 2 has: a base material part 21 formed by an elastic material; and an annular fiber-reinforced plastic 22 buried in the base material part 21. Peeling strength between the base material part 21 and the fiber-reinforced plastic 22 is 200 N/25 mm or higher.SELECTED DRAWING: Figure 1

Description

  The present invention provides a support structure including an inner annular portion, an outer annular portion provided concentrically on the outer side of the inner annular portion, and a connecting portion that connects the inner annular portion and the outer annular portion. The present invention relates to a non-pneumatic tire and a manufacturing method thereof.

  The pneumatic tire has a load supporting function, a shock absorbing ability from the ground contact surface, and a transmission ability (acceleration, stop, change of direction) such as power. For this reason, many vehicles, particularly bicycles, motorcycles, automobiles, It is used in trucks.

  In particular, these capabilities greatly contributed to the development of automobiles and other motor vehicles. Furthermore, the impact absorbing ability of pneumatic tires is useful for medical equipment and electronic equipment transport carts and other applications.

  Conventional non-pneumatic tires include, for example, solid tires, spring tires, cushion tires, and the like, but do not have the superior performance of pneumatic tires. For example, solid tires and cushion tires having a solid rubber structure support the load by compressing the contact portion, but this type of tire is heavy and stiff, and does not have a shock absorbing ability like a pneumatic tire. Further, in the non-pneumatic tire, it is possible to improve the cushioning property by increasing the elasticity, but there is a problem that the load supporting ability or the durability as the pneumatic tire has is deteriorated.

  In the following Patent Document 1, a circular first band, a first band that surrounds the first band in a separated state, a second band having a larger diameter than the first band, and the first band and the second band are connected. A tread connected to an outer surface of the second band, a plurality of spokes, a first connecting member and a second connecting member interconnecting the spokes arranged side by side; the second band; An airless tire further including a reinforcing layer positioned between the tread is disclosed. The reinforcing layer of Patent Document 1 corresponds to an air layer of a tire and plays a role of supporting the load of the vehicle.

  Patent Document 2 below discloses an inner annular portion, an outer annular portion concentrically provided outside the inner annular portion, and extends from the inner annular portion to the outer annular portion, each independently in the tire circumferential direction. A non-pneumatic tire having a support structure provided with a plurality of connecting portions provided as described above is disclosed. In this non-pneumatic tire, a reinforcing layer for reinforcing bending deformation may be provided outside the outer annular portion.

  By the way, Patent Document 1 and Patent Document 2 do not have a specific description regarding a joining method between a reinforcing layer and another member. As a method for joining the reinforcing layer and the other member, for example, an adhesive may be used. However, depending on the strength of the adhesive, there is a risk of peeling between the members.

JP 2014-8958 A JP 2014-172404 A

  Then, the objective of this invention is providing the non-pneumatic tire which can suppress peeling between a reinforcement layer and another member, and can improve durability, and its manufacturing method.

The above object can be achieved by the present invention as described below.
That is, the non-pneumatic tire of the present invention includes an inner annular portion, an outer annular portion provided concentrically outside the inner annular portion, and a connecting portion that connects the inner annular portion and the outer annular portion. A non-pneumatic tire comprising a support structure configured,
The inner annular portion or the outer annular portion includes a base material portion made of an elastic material, and an annular fiber reinforced plastic embedded in the base material portion,
The peel strength between the base material portion and the fiber reinforced plastic is 200 N / 25 mm or more.

  The non-pneumatic tire of the present invention includes an inner annular portion, an outer annular portion provided concentrically outside the inner annular portion, and a connecting portion that connects the inner annular portion and the outer annular portion. It has a structure. Further, a fiber reinforced plastic as a reinforcing layer is embedded in the inner annular portion or the outer annular portion. In the present invention, since the peel strength between the base portion of the inner annular portion or the outer annular portion and the fiber reinforced plastic is 200 N / 25 mm or more, the fiber reinforced plastic (corresponding to the reinforcing layer) and the base portion (others) (Equivalent to a member) and the durability can be improved by suppressing the separation between them.

  In the non-pneumatic tire according to the present invention, the fiber reinforced plastic preferably has a surface roughness (Ra) of 10 μm or more and 40 μm or less.

  By setting the surface roughness (Ra) of the fiber reinforced plastic to 10 μm or more and 40 μm or less, the base material portion enters the irregularities on the surface of the fiber reinforced plastic, and an anchor effect can be obtained. As a result, since the peel strength between the base material portion and the fiber reinforced plastic is increased, the peel between the fiber reinforced plastic and the base material portion can be suppressed to improve the durability.

The non-pneumatic tire manufacturing method of the present invention includes an inner annular portion, an outer annular portion provided concentrically outside the inner annular portion, and a connection that connects the inner annular portion and the outer annular portion. A method for producing a non-pneumatic tire comprising a support structure composed of a portion,
A middle mold for molding the inner peripheral side of the inner annular part, an outer mold for molding the outer peripheral side of the outer annular part, and a circumferential direction between the middle mold and the outer mold, A plurality of cores for forming the outer peripheral side, the inner peripheral side of the outer annular portion, and the connecting portion; a pair of upper molds and lower molds for molding both side surfaces in the tire width direction of the support structure; And forming a cavity corresponding to the inner annular portion, the outer annular portion, and the connecting portion;
Increasing the surface roughness (Ra) of the fiber reinforced plastic to 10 μm or more and 40 μm or less;
Disposing the annular fiber-reinforced plastic in a portion corresponding to the inner annular portion or the outer annular portion of the cavity;
Supplying a raw material liquid of an elastic material to the cavity and curing it to form a base material portion of the support structure.

  The non-pneumatic tire manufactured according to the present invention includes an inner annular portion, an outer annular portion provided concentrically on the outer side of the inner annular portion, and a connecting portion that connects the inner annular portion and the outer annular portion. A supporting structure. Further, fiber reinforced plastic as a reinforcing layer is embedded in the molded inner annular portion or outer annular portion. In the present invention, by setting the surface roughness (Ra) of the fiber reinforced plastic to 10 μm or more and 40 μm or less, the peel strength between the base material portion and the fiber reinforced plastic increases, so that the fiber reinforced plastic (corresponding to the reinforcing layer) It is possible to improve the durability by suppressing the separation between the substrate and the base material portion (corresponding to another member).

  In the non-pneumatic tire manufacturing method according to the present invention, it is preferable that the surface roughness (Ra) of the fiber-reinforced plastic is increased by energy irradiation.

  By using energy irradiation, the surface roughness (Ra) of the fiber reinforced plastic can be increased without reducing the rigidity as the reinforcing layer.

Front view showing an example of the non-pneumatic tire of the present invention 1 is a cross-sectional view of the non-pneumatic tire shown in FIG. Front view and longitudinal sectional view showing a mold for molding the support structure

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing an example of a non-pneumatic tire. 2 is a cross-sectional view of the non-pneumatic tire of FIG. Here, O indicates a tire shaft, and H indicates a tire cross-sectional height.

  The non-pneumatic tire T of the present invention has a support structure SS that supports a load from a vehicle. The non-pneumatic tire T of the present invention only needs to be provided with such a support structure SS, and a member corresponding to a tread on the outer side (outer peripheral side) or inner side (inner peripheral side) of the support structure SS, A reinforcing layer, a member for fitting with an axle or a rim, and the like may be provided.

  As shown in the front view of FIG. 1, the non-pneumatic tire T of the present embodiment includes an inner annular portion 1, an outer annular portion 2 provided concentrically on the outer side, and an inner annular portion. 1 and a connecting portion 3 that connects the outer annular portion 2.

  The inner annular portion 1 is preferably a cylindrical shape having a constant thickness from the viewpoint of improving uniformity. Moreover, it is preferable to provide the inner peripheral surface of the inner annular portion 1 with irregularities or the like for maintaining fitting properties for mounting with an axle or a rim.

  The thickness of the inner annular portion 1 in the tire radial direction is preferably 1 to 20% of the tire cross-section height H from the viewpoint of reducing weight and improving durability while sufficiently transmitting force to the connecting portion 3. 10% is more preferable.

  The inner diameter of the inner annular portion 1 is appropriately determined in accordance with the rim on which the non-pneumatic tire T is mounted and the dimensions of the axle. However, when an alternative to a general pneumatic tire is assumed, 250 to 500 mm is preferable, and 330 to 440 mm is more preferable.

  The width of the inner annular portion 1 in the tire axial direction is appropriately determined according to the application, the length of the axle, and the like. However, when an alternative to a general pneumatic tire is assumed, 100 to 300 mm is preferable, and 130 to 250 mm is preferable. More preferred.

  The tensile modulus of the inner annular portion 1 is preferably 5 to 180000 MPa, more preferably 7 to 50000 MPa, from the viewpoint of reducing weight, improving durability, and wearing properties while sufficiently transmitting force to the connecting portion 3. The tensile modulus in the present invention is a value calculated from a tensile stress at 10% elongation by conducting a tensile test according to JIS K7312.

  The outer annular portion 2 is preferably cylindrical with a constant thickness from the viewpoint of improving uniformity. The thickness of the outer annular portion 2 in the tire radial direction is preferably 1 to 20% of the tire cross-section height H from the viewpoint of reducing weight and improving durability while sufficiently transmitting the force from the connecting portion 3. 10% is more preferable.

  The outer annular portion 2 includes a base material portion 21 made of an elastic material and an annular fiber reinforced plastic 22 embedded in the base material portion 21. The fiber reinforced plastic 22 functions as a reinforcing layer. Examples of the fiber reinforced plastic 22 include carbon fiber reinforced plastic (CFRP) and glass fiber reinforced plastic (GFRP). The reinforcing layer made of the fiber reinforced plastic 22 can be easily formed by using a sheet-like intermediate member in which a fiber cloth (woven fabric) is impregnated with a thermosetting resin. The fiber orientation direction is preferably the tire width direction and the tire circumferential direction. Note that a plurality of fiber reinforced plastics 22 may be laminated.

  The peel strength between the base material portion 21 and the fiber reinforced plastic 22 is 200 N / 25 mm or more, preferably 300 N / 25 mm or more. When the peel strength is less than 200 N / 25 mm, peeling is likely to occur between the base material portion 21 and the fiber reinforced plastic 22, and the durability of the outer annular portion 2 becomes insufficient. The peel strength in the present invention is a value measured according to JIS K-6256-2, and indicates that peeling is more difficult as the value of peel strength is larger.

  The surface roughness (Ra) of the fiber reinforced plastic 22 is 10 μm or more, preferably 20 μm or more. By setting the surface roughness (Ra) of the fiber reinforced plastic 22 to 10 μm or more, the peel strength between the base material portion 21 and the fiber reinforced plastic 22 can be increased by the anchor effect. On the other hand, when the surface roughness (Ra) is less than 10 μm, it becomes difficult to exhibit a sufficient anchor effect.

  The fiber reinforced plastic 22 has a surface roughness (Ra) of 40 μm or less, preferably 30 μm or less. When the surface roughness (Ra) is larger than 26 μm, the affinity at the interface between the base material portion 21 and the fiber reinforced plastic 22 is reduced due to the entrapment of air bubbles, etc., so that the improvement in peel strength due to the anchor effect becomes a limit. . Furthermore, if the surface roughness (Ra) is larger than 40 μm, sufficient peel strength cannot be obtained.

  The inner diameter of the outer annular portion 2 is appropriately determined according to its use. However, when an alternative to a general pneumatic tire is assumed, 420 to 750 mm is preferable, and 480 to 680 mm is more preferable.

  The width of the outer annular portion 2 in the tire axial direction is appropriately determined according to the application, the length of the axle, and the like. However, when an alternative to a general pneumatic tire is assumed, 100 to 300 mm is preferable, and 130 to 250 mm is preferable. More preferred.

  The tensile modulus of the outer annular portion 2 is preferably 5 to 180000 MPa and more preferably 7 to 50000 MPa from the viewpoint of reducing weight and improving durability while sufficiently transmitting force to the connecting portion 3.

  The connecting portion 3 connects the inner annular portion 1 and the outer annular portion 2, and a plurality of connecting portions 3 are provided so as to be independent from each other in the tire circumferential direction with an appropriate interval therebetween.

  The connecting portion 3 has a plate shape extending from the inner annular portion 1 to the outer annular portion 2 in the tire radial direction. Moreover, the connection part 3 is extended in the tire width direction. The connection part 3 of this embodiment is formed continuously from one tire end in the tire width direction to the other tire end.

  The number of connecting portions 3 of the entire tire is preferably 10 to 80, and 40 to 60 from the viewpoint of reducing weight, improving power transmission, and improving durability while sufficiently supporting the load from the vehicle. More preferred.

  The thickness of the connecting portion 3 in the tire circumferential direction is 1 to 30 of the tire cross-section height H from the viewpoint of reducing the weight and improving the durability while sufficiently transmitting the force from the inner annular portion 1 and the outer annular portion 2. % Is preferable, and 1 to 20% is more preferable. The thickness of the connecting portion 3 in the tire circumferential direction is preferably 2 mm or more in order to ensure durability.

  The width of the connecting portion 3 in the tire axial direction is appropriately determined according to the use and the like, but is preferably 100 to 300 mm, and more preferably 130 to 250 mm when an alternative to a general pneumatic tire is assumed.

  The tensile modulus of the connecting portion 3 is preferably 5 to 50 MPa from the viewpoint of reducing the weight, improving the durability, and improving the lateral rigidity while sufficiently transmitting the force from the inner annular portion 1 and the outer annular portion 2. -20 MPa is more preferable.

  The support structure SS in the present invention is formed of an elastic material. The elastic material in the present invention refers to a material having a tensile modulus calculated from a tensile stress at 10% elongation by a tensile test according to JIS K7312 and 100 MPa or less. The elastic material of the present invention preferably has a tensile modulus of 5 to 100 MPa, more preferably 7 to 50 MPa from the viewpoint of imparting adequate rigidity while obtaining sufficient durability. Examples of the elastic material used as the base material include thermoplastic elastomers, crosslinked rubbers, and other resins.

  Examples of the thermoplastic elastomer include polyester elastomer, polyolefin elastomer, polyamide elastomer, polystyrene elastomer, polyvinyl chloride elastomer, polyurethane elastomer and the like. Rubber materials constituting the crosslinked rubber material include natural rubber, styrene butadiene rubber (SBR), butadiene rubber (BR), isoprene rubber (IIR), nitrile rubber (NBR), hydrogenated nitrile rubber (hydrogenated NBR). And synthetic rubbers such as chloroprene rubber (CR), ethylene propylene rubber (EPDM), fluorine rubber, silicon rubber, acrylic rubber, and urethane rubber. These rubber materials may be used in combination of two or more as required.

  Examples of other resins include thermoplastic resins and thermosetting resins. Examples of the thermoplastic resin include polyethylene resin, polystyrene resin, and polyvinyl chloride resin, and examples of the thermosetting resin include epoxy resin, phenol resin, polyurethane resin, silicon resin, polyimide resin, and melamine resin.

  Of the above elastic materials, a polyurethane resin is preferably used from the viewpoint of moldability / workability and cost. In addition, as an elastic material, you may use a foaming material, and what used said thermoplastic elastomer, crosslinked rubber, and other resin foamed can be used.

  In the support structure SS integrally formed of an elastic material, the inner annular portion 1, the outer annular portion 2, and the connecting portion 3 are preferably reinforced by reinforcing fibers.

  Examples of the reinforcing fibers include reinforcing fibers such as long fibers, short fibers, woven fabrics, and non-woven fabrics. As a form using long fibers, fibers arranged in the tire axial direction and fibers arranged in the tire circumferential direction It is preferable to use a net-like fiber assembly composed of:

  Examples of the types of reinforcing fibers include rayon cords, polyamide cords such as nylon-6,6, polyester cords such as polyethylene terephthalate, aramid cords, glass fiber cords, carbon fibers, and steel cords.

  In the present invention, in addition to reinforcement using reinforcing fibers, it is possible to perform reinforcement with a granular filler or reinforcement with a metal ring or the like. Examples of the particulate filler include ceramics such as carbon black, silica, and alumina, and other inorganic fillers.

  The support structure SS in the present invention is formed of an elastic material. However, the inner ring portion 1, the outer ring portion 2, and the connection portion 3 are used from the viewpoint of enabling integral molding when the support structure SS is manufactured. Are preferably basically the same material except for the reinforcing structure.

  In the present embodiment, an example in which a tread rubber 4 is provided outside the outer annular portion 2 is shown. As the tread rubber 4, the same tread rubber as that of a conventional pneumatic tire can be provided. Moreover, it is possible to provide the same pattern as a conventional pneumatic tire as a tread pattern.

<Method for producing non-pneumatic tire>
The manufacturing method of the present invention is a manufacturing method capable of suitably manufacturing the non-pneumatic tire T of the present invention as described above, and includes a middle mold for molding the inner peripheral side of the inner annular portion 1 and the outer annular portion 2. An outer mold for molding the outer peripheral side and a circumferential direction between the middle mold and the outer mold, and for molding the outer peripheral side of the inner annular part 1, the inner peripheral side of the outer annular part 2, and the connecting part 3 A plurality of cores and a pair of upper mold and lower mold for molding both side surfaces in the tire width direction of the support structure SS are arranged, and correspond to the inner annular portion 1, the outer annular portion 2 and the connecting portion 3. A step of forming a cavity, a step of increasing the surface roughness (Ra) of the fiber reinforced plastic 22 to 10 μm or more and 40 μm or less, and a portion of the cavity corresponding to the inner annular portion 1 or the outer annular portion 2 having an annular shape A step of disposing the fiber reinforced plastic 22 and And a step of forming a base material portion 21 of the support structure SS by supplying a raw material liquid of an elastic material and curing it.

  FIG. 3 shows a forming die for forming the support structure SS, (a) a front view and (b) a longitudinal sectional view. The mold 10 has a cavity C corresponding to the support structure SS. The cavities C1 to C3 correspond to the inner annular portion 1, the outer annular portion 2, and the connecting portion 3 of the support structure SS, respectively. Such a cavity C is formed by the middle mold 11, the outer mold 12, the core 13, the upper mold 14 (not shown in FIG. 3A), and the lower mold 15. The middle die 11 is formed on the inner peripheral side of the inner annular portion 1, the outer die 12 is formed on the outer peripheral side of the outer annular portion 3, and the core 13 is formed on the outer peripheral side of the inner annular portion 1 and the outer annular portion 2. This is for molding the inner peripheral side and the connecting portion 3. Moreover, the upper mold | type 14 and the lower mold | type 15 are for shape | molding the tire width direction both sides | surfaces of the support structure SS. The middle mold 11, the outer mold 12, and the core 13 can be fixed to the lower mold 15, and the upper mold 14 can be opened and closed with respect to the lower mold 15.

  An annular fiber reinforced plastic 22 is disposed in the cavity C <b> 2 between the outer mold 12 and the core 13. However, the surface roughness (Ra) of the fiber reinforced plastic 22 is increased in advance before the fiber reinforced plastic 22 is disposed in the cavity C2. As a method for increasing the surface roughness (Ra) of the fiber reinforced plastic 22, there is a mechanical method such as buffing, but a method using energy irradiation is preferable. According to the energy irradiation, the surface roughness of the fiber reinforced plastic 22 can be increased without reducing the rigidity as the reinforcing layer. As energy irradiation, the thing by electron beam irradiation is preferable. When the surface roughness (Ra) of the fiber reinforced plastic 22 before the electron beam irradiation is 5 to 10 μm, the electron beam irradiation is preferably performed with an irradiation dose of 30 to 180 kGy, and is performed with an irradiation dose of 100 to 150 kGy. More preferred.

  When the fiber reinforced plastic 22 is formed in an annular shape, the fiber reinforced plastic 22 preferably retains its annular shape and can be self-supporting. If the fiber is too soft to be self-supporting, it may be made self-supporting by coating with a resin. Examples of the coating resin include polyurethane primers and resin emulsions.

  Next, the cavity C of the mold 10 is filled with a raw material liquid of an elastic material. Examples of the raw material liquid for the elastic material include those obtained by softening the above-described elastic material at a high temperature, and liquid raw materials before reaction curing or before crosslinking. At the time of filling, it is preferable that the viscosity of the raw material liquid is small at the time of filling in order to suitably enter the gap of the cavity C and impregnate the reinforcing fibers.

  In addition, a method of applying centrifugal force is also effective for the purpose of uniformly filling the raw material liquid. In that case, a method of forming the lower mold 15 of the mold 10 in a disk shape and rotating the mold 10 around the axis O with a motor or the like can be used.

  Next, the support structure SS can be obtained by solidifying and removing the raw material liquid of the elastic material. Examples of the method for solidifying the raw material liquid include reaction curing, heat curing, and cooling solidification. In order to facilitate demolding, it is effective to make the core 13 of the mold 10 removable.

  After demolding, a post-cure process or the like can also be performed. Thereafter, a belt layer, tread rubber, or the like may be wound around and bonded to the outer peripheral side of the support structure SS via an adhesive.

[Other Embodiments]
(1) In the above-described embodiment, the example in which the fiber reinforced plastic is embedded in the outer annular portion 2 has been described. However, the fiber reinforced plastic may be embedded in the inner annular portion 1. Further, fiber reinforced plastic may be embedded in both the inner annular portion 1 and the outer annular portion 2.

  (2) In the above-described embodiment, an example in which a plurality of plate-like connecting portions 3 extending in the tire radial direction are provided so as to be independent from each other in the tire circumferential direction has been described. As long as the part 1 and the outer annular part 2 are connected, the shape, number, arrangement, etc. are not particularly limited.

  (3) As other embodiments of the present invention, an inner annular portion, an intermediate annular portion provided concentrically outside the inner annular portion, and an outer annular provided concentrically outside the intermediate annular portion A non-pneumatic tire having a support structure including a portion, an inner connecting portion that connects the inner annular portion and the intermediate annular portion, and an outer connecting portion that connects the intermediate annular portion and the outer annular portion, The outer annular part includes a base part made of an elastic material and an annular fiber reinforced plastic embedded in the base part, and the peel strength between the base part and the fiber reinforced plastic is 200 N / It may be 25 mm or more.

  Examples and the like specifically showing the configuration and effects of the present invention will be described below.

Comparative Example 1
The non-pneumatic tire manufactured without performing electron beam irradiation with respect to fiber reinforced plastic was made into the comparative example 1. The surface roughness was 8.2 μm. The evaluation results are shown in Table 1.

Examples 1-5, Comparative Example 2
Non-pneumatic tires manufactured by using fiber reinforced plastic having a surface roughness increased by irradiating the fiber reinforced plastic with an electron beam were designated as Examples 1 to 5 and Comparative Example 2. The evaluation results are shown in Table 1.

  From the results in Table 1, the following can be understood. In the non-pneumatic tire of Comparative Example 1, the peel strength between the base material portion and the fiber reinforced plastic was insufficient, so that the peel occurred between the fiber reinforced plastic and the base material portion. Compared with Comparative Example 1, the non-pneumatic tires of Examples 1 to 5 had a peel strength of 200 N / 25 mm or more, and could suppress peeling between the fiber-reinforced plastic and the base material portion. In the non-pneumatic tire of Comparative Example 2, the surface roughness was larger than 40 μm, sufficient peel strength was not obtained, and peeling occurred between the fiber reinforced plastic and the base material portion.

DESCRIPTION OF SYMBOLS 1 Inner ring part 2 Outer ring part 3 Connection part 10 Mold 11 Middle mold 12 Outer mold 13 Core 14 Upper mold 15 Lower mold 21 Base material part 22 Fiber reinforced plastic SS Support structure T Non-pneumatic tire C Cavity

Claims (6)

Non-pneumatic comprising a support structure comprising an inner annular portion, an outer annular portion concentrically provided outside the inner annular portion, and a connecting portion that connects the inner annular portion and the outer annular portion. Tire,
The inner annular portion or the outer annular portion includes a base material portion made of an elastic material, and an annular fiber reinforced plastic embedded in the base material portion,
The non-pneumatic tire characterized by the peeling strength between the said base-material part and the said fiber reinforced plastic being 200 N / 25mm or more.   2. The non-pneumatic tire according to claim 1, wherein a surface roughness (Ra) of the fiber reinforced plastic is 10 μm or more and 40 μm or less.   The non-pneumatic tire according to claim 1, wherein the elastic material is a thermosetting polyurethane. Non-pneumatic comprising a support structure comprising an inner annular portion, an outer annular portion concentrically provided outside the inner annular portion, and a connecting portion that connects the inner annular portion and the outer annular portion. A tire manufacturing method comprising:
A middle mold for molding the inner peripheral side of the inner annular part, an outer mold for molding the outer peripheral side of the outer annular part, and a circumferential direction between the middle mold and the outer mold, A plurality of cores for forming the outer peripheral side, the inner peripheral side of the outer annular portion, and the connecting portion; a pair of upper molds and lower molds for molding both side surfaces in the tire width direction of the support structure; And forming a cavity corresponding to the inner annular portion, the outer annular portion, and the connecting portion;
Increasing the surface roughness (Ra) of the fiber reinforced plastic to 10 μm or more and 40 μm or less;
Disposing the annular fiber-reinforced plastic in a portion corresponding to the inner annular portion or the outer annular portion of the cavity;
A method of manufacturing a non-pneumatic tire, comprising: supplying a raw material liquid of an elastic material to the cavity and curing the material liquid to form a base material portion of the support structure.   The method for producing a non-pneumatic tire according to claim 4, wherein the surface roughness (Ra) of the fiber reinforced plastic is increased by energy irradiation. The non-pneumatic tire manufacturing method according to claim 4, wherein the elastic material is thermosetting polyurethane.

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