WO2017086363A1

WO2017086363A1 - Tire manufacturing method

Info

Publication number: WO2017086363A1
Application number: PCT/JP2016/084016
Authority: WO
Inventors: 俊哉宮園; 櫻井　良
Original assignee: 株式会社ブリヂストン
Priority date: 2015-11-16
Filing date: 2016-11-16
Publication date: 2017-05-26
Also published as: JP2017087677A

Abstract

A tire manufacturing method wherein a heat-resistant film, on the surface of which protrusions or recesses are arranged in a regular pattern, is disposed inside a mold so that said surface contacts an unvulcanized tire and said unvulcanized tire is vulcanized and molded.

Description

Tire manufacturing method

The present disclosure relates to a tire manufacturing method.

Conventionally, in order to increase the visibility of the pattern part in the tire side part, a protrusion is formed on the tire surface using a mold having holes or grooves formed on the surface, and the contrast between the pattern part and the periphery of the pattern part is Is disclosed (for example, WO2012 / 131089).

However, it is difficult to form fine holes and grooves on the curved mold surface, and it is difficult to obtain sufficient visibility in the pattern part by forming a protruding part with high dimensional accuracy on the tire surface.

The present disclosure is intended to improve the visibility of the pattern portion by forming a protruding portion or a recessed portion with high dimensional accuracy on the tire surface by a simple method in consideration of the above facts.

According to the tire manufacturing method of the first aspect of the present disclosure, a heat-resistant film having convex portions or concave portions regularly arranged on a surface is disposed in a mold so that the surface contacts an unvulcanized tire. Vulcanized tires are vulcanized.

According to the tire manufacturing method of the first aspect of the present disclosure, the heat-resistant film in which convex portions or concave portions are regularly arranged on the surface forms the inner surface of the mold, and is arranged on the heat-resistant film during vulcanization molding of the tire. The unvulcanized rubber having high fluidity flows into the gaps or recesses between the protruding portions. In this state, the rubber is vulcanized and cured, whereby a pattern portion in which indentations or protrusions corresponding to the shapes of the protrusions or recesses of the heat-resistant film are regularly arranged is formed on the surface of the tire. . Note that the surface of the tire on which the pattern portion is formed includes the surface of the tire side portion, the tread surface, the bottom and side surfaces of the grooves and sipes, the surface of the bead portion in contact with the rim, the surface inside the tire, and the like.

When light enters the gap between the indented portions or the protruding portions, the incident light is reflected on the wall surface or bottom surface of the indented portion or the protruding portions, and the reflected light interferes with each other to develop a color. Alternatively, the incident light is attenuated while being repeatedly reflected between the wall surfaces of the intrusion portion or the protruding portion, so that the reflection of the light is suppressed and looks black.

Therefore, the contrast between the pattern portion in which the indented portion or the protruding portion is regularly arranged and the periphery thereof is increased, and the visibility of the pattern portion is improved.
In the tire manufacturing method according to the first aspect of the present disclosure, in order to form the indented portion or the protruding portion on the surface of the tire, the film may be processed to form a convex portion or a concave portion. Therefore, compared with the conventional method of forming a hole or groove in a metal mold, it is possible to form a protruding portion or indented portion with high dimensional accuracy by a simple method.

A tire manufacturing method according to a second aspect of the present disclosure is the tire manufacturing method according to the first aspect, wherein the heat-resistant film is formed in a flat plate shape, curved along the inner surface of the mold, and disposed in the mold. Is done.

According to the tire manufacturing method of the second aspect of the present disclosure, a flat film in which convex portions or concave portions are arranged may be curved along the curved surface of the mold at the time of molding. That is, the convex part and concave part formed in the flat film can be transferred to the tire surface. Therefore, compared with the conventional method of forming holes and grooves on the curved inner surface of the mold, it is possible to form protrusions or indentations with high dimensional accuracy on the tire surface by a simple method.

A tire manufacturing method according to a third aspect of the present disclosure is the tire manufacturing method according to the first aspect or the second aspect, wherein the height of the convex portion and the depth of the concave portion are 0.1 μm to 1 mm, and are adjacent to each other. An interval between the convex portions and an interval between the adjacent concave portions are set to 0.1 μm to 1 mm.

According to the tire manufacturing method of the third aspect of the present disclosure, the height of the convex portions and the depth of the concave portions are 0.1 μm to 1 mm, and the interval between the adjacent convex portions and the interval between the adjacent concave portions is 0. Since the thickness is set to 1 μm to 1 mm, the effect of light interference or attenuation in the pattern portion formed on the tire surface is enhanced, and the visibility of the pattern portion can be improved.

A tire manufacturing method according to a fourth aspect of the present disclosure is the tire manufacturing method according to any one of the first to third aspects, wherein the maximum width of the convex portion and the maximum width of the concave portion are 0.1 μm to 1 mm. It is said that.

According to the tire manufacturing method of the fourth aspect of the present disclosure, since the maximum width of the convex portion and the maximum width of the concave portion are 0.1 μm to 1 mm, the light interference or the pattern portion formed on the tire surface The attenuation effect is further enhanced, and the visibility of the pattern portion can be improved.

A tire manufacturing method according to a fifth aspect of the present disclosure is the tire manufacturing method according to any one of the first to fourth aspects, wherein the heat-resistant film is disposed so as to contact a side portion of the unvulcanized tire. Is done.

According to the tire manufacturing method of the fifth aspect of the present disclosure, the pattern portion in which the indented portions or the protruding portions are regularly arranged is formed on the side portion of the tire. Therefore, the visibility of the pattern portion can be improved as compared with the case where the pattern portion is formed on the tread portion, the shoulder portion, or the like.

A tire manufacturing method according to a sixth aspect of the present disclosure is the tire manufacturing method according to any one of the first to fifth aspects, wherein a portion of the tire surface in contact with the heat-resistant film is in contact with the mold. It is recessed from the tire surface inward in the tire radial direction.

According to the tire manufacturing method of the sixth aspect of the present disclosure, the portion of the tire surface in contact with the heat-resistant film is formed to be recessed inward in the tire radial direction from the portion of the tire surface in contact with the mold. Therefore, the visibility of the part which a heat-resistant film contacts can improve, and the visibility of the pattern part formed in the part which a heat-resistant film contacts can further be improved.

A tire manufacturing method according to a seventh aspect of the present disclosure is the tire manufacturing method according to any one of the first to sixth aspects, in which the heat-resistant film is surrounded by a portion where the convex portions or the concave portions are arranged. The flat portion is an inverted mark obtained by inverting a mark made of characters, numbers, symbols, figures, or the like.

According to the tire manufacturing method of the seventh aspect of the present disclosure, a mark composed of numbers, symbols, figures or the like composed of flat portions is formed on the tire surface after vulcanization. Therefore, it is possible to appeal the manufacturer name, product name, size, etc. to the viewer.

A tire manufacturing method according to an eighth aspect of the present disclosure is the tire manufacturing method according to any one of the first to sixth aspects, wherein the heat-resistant film surrounds the portion where the convex portions or the concave portions are arranged. A portion having a flat portion and in which the convex portion or the concave portion is arranged is an inverted mark obtained by inverting a mark made up of characters, numbers, symbols or figures.

According to the tire manufacturing method of the eighth aspect of the present disclosure, a mark made of letters, numbers, symbols, figures, or the like in which convex portions or the concave portions are arranged is formed on the tire surface after vulcanization. Therefore, it is possible to appeal the manufacturer name, product name, size, etc. to the viewer.

According to the method for manufacturing a tire according to the present disclosure, it is possible to improve the visibility of the pattern portion by forming a protruding portion or a recessed portion with high dimensional accuracy on the tire surface by a simple method.

It is a side view of the tire manufactured by the manufacturing method of the tire concerning a 1st embodiment of this indication. It is a partial expansion perspective view showing details of a pattern part of a tire manufactured by a manufacturing method of a tire concerning a 1st embodiment of this indication. It is a perspective view showing a heat-resistant film used in a manufacturing method of a tire concerning a 1st embodiment of this indication. It is a partial expansion perspective view which shows the detail of the uneven | corrugated | grooved part of the heat-resistant film used in the manufacturing method of the tire which concerns on 1st Embodiment of this indication. It is a partial expansion perspective view showing details of a pattern part of a tire manufactured by a manufacturing method of a tire concerning a 2nd embodiment of this indication. It is a partial expansion perspective view which shows the detail of the uneven | corrugated | grooved part of the heat-resistant film used in the manufacturing method of the tire which concerns on 2nd Embodiment of this indication. It is a partial expansion perspective view showing details of a pattern part of a tire manufactured by a manufacturing method of a tire concerning modification 1 of this indication. It is a partial expansion perspective view which shows the detail of the uneven | corrugated | grooved part of the heat-resistant film used in the manufacturing method of the tire which concerns on the modification 1 of this indication. It is a partial expansion perspective view showing details of a pattern part of a tire manufactured by a manufacturing method of a tire concerning modification 2 of this indication. It is a partial expansion perspective view which shows the detail of the uneven | corrugated | grooved part of the heat-resistant film used in the manufacturing method of the tire which concerns on the modification 2 of this indication. It is a partial expansion perspective view showing details of a pattern part of a tire manufactured by a manufacturing method of a tire concerning modification 3 of this indication. It is a partial expansion perspective view which shows the detail of the uneven | corrugated | grooved part of the film used in the manufacturing method of the tire which concerns on the modification 3 of this indication. It is a partial expansion perspective view showing details of a pattern part of a tire manufactured by a manufacturing method of a tire concerning modification 4 of this indication. It is a partial expansion perspective view which shows the detail of the uneven | corrugated | grooved part of the heat-resistant film used in the manufacturing method of the tire which concerns on the modification 4 of this indication. It is a side view of the tire manufactured by the manufacturing method of the tire concerning other embodiments of this indication. In the manufacturing method of the tire concerning a 1st embodiment of this indication, it is a side view showing the state before bonding a heat-resistant film to a metallic mold. In the manufacturing method of the tire concerning a 1st embodiment of this indication, it is a side view showing the state where the heat-resistant film was pasted up to the metallic mold. In the tire manufacturing method according to the first embodiment of the present disclosure, an unvulcanized tire is set in a mold, and a heat-resistant film is sandwiched between an unvulcanized rubber and a mold. . In the manufacturing method of the tire concerning a 1st embodiment of this indication, it is a side view showing the state where the tire was removed from the metallic mold after vulcanization.

[First Embodiment]
(tire)
Hereinafter, with reference to drawings, the tire manufactured by the manufacturing method of the tire concerning a 1st embodiment of this indication is explained.
First, an outline of a pneumatic tire 10A according to the present embodiment (hereinafter simply referred to as “tire 10A”) will be described with reference to FIG. FIG. 1 shows a side view of the tire 10A. In the present embodiment, the tire circumferential direction is indicated by U, and the tire radial direction is indicated by R.

As shown in FIG. 1, on the surface 12A of the tire side portion 12 of the tire 10A, a decorative pattern that surrounds a mark 14 formed of a smooth surface and each component 14A constituting the mark 14. A portion 20A is formed.

The mark 14 is a mark made up of letters, numbers, symbols, figures, etc., and indicates the manufacturer name, product name, size, and the like. In the present embodiment, for example, it is composed of characters “ABCDEFGH”. In the present embodiment, each character constituting the mark 14 is a component 14A.

(Pattern part)
Next, the configuration of the pattern unit 20A will be described with reference to FIG. FIG. 2 shows a protrusion 23 as an example of the protruding portion. The protrusion 23 is a linear protrusion having a height H1 which is erected in a direction perpendicular to the base surface 22 (that is, a normal direction) from the base surface 22 which is the surface of the pattern portion 20A, and is indicated by an arrow D1 in FIG. It extends along the indicated direction, and is arranged at equal intervals (or regularly) at intervals P1 along the direction indicated by the arrow D2. The width of the protrusion 23, that is, the length in the direction along the arrow D2, is L1.

In this embodiment, H1 = 1 μm, P1 = 2 μm, and L1 = 1 μm, and the arrows D1 and D2 are orthogonal to each other when viewed from the normal direction of the base surface 22. Note that the values of H1, P1, and L1 each include values that are increased or decreased by about 10%.

The protrusion 23 is erected in a direction perpendicular to the base surface 22, but this configuration is not limited to the case where both wall surfaces of the protrusion 23 are perpendicular to the base surface 22. This includes a case where the distance between both wall surfaces is widened toward the base surface 22 and a straight line connecting the centers of both wall surfaces intersecting with a plane parallel to the base surface 22 is formed vertically.

(the film)
Next, the configuration of the film 40A for forming the protrusions 23 will be described with reference to FIG. When the film 40A is placed between a mold (mold) for vulcanizing and molding a tire and an unvulcanized tire (raw tire) and vulcanized, melting, deformation, or modification does not occur, or It is a heat-resistant elastic film that is so fine that it can be ignored. It is formed in a flat plate shape.

Note that “formed in a flat plate shape” means that the film 40A is stable in a state where the surface of the film 40A is parallel to the horizontal surface in a state where the film 40A is placed on a horizontal surface. The film 40 A includes an object that bends or twists when an external force is applied.

As shown in FIG. 3, on the surface of the film 40 A, a reverse mark 16 formed as a smooth surface and an uneven portion 50 A surrounding each component 16 A constituting the reverse mark 16 are formed. . The inverted mark 15 has a shape obtained by inverting the mark 14, and the component 15 A has a shape obtained by inverting the component 14 A.

Further, an adhesive layer 42 is formed on the back surface of the film 40A, and a release paper (not shown) is attached to the back surface of the adhesive layer 42. The adhesive layer 42 is used to attach the film 40A to the inner surface of the mold during the vulcanization molding of the tire 10A, but the adhesive force is not lost due to the heat (about 150 to 200 ° C.) generated during the vulcanization, The adhesive strength is such that the film 40A can be easily peeled off from the mold surface after vulcanization.

(Uneven portion)
Next, with reference to FIG. 4, the structure of the uneven part 50A of the film 40A will be described. FIG. 4 shows a groove 53 as an example of a recess in the present disclosure. The groove 53 is a linear groove having a depth H2 formed in a direction perpendicular to the base surface 52 from the base surface 52 that is the surface of the uneven portion 50A. The grooves 53 extend along the direction indicated by the arrow D3 in FIG. 4 and are arranged at regular intervals (or regular intervals) at the interval P2 along the direction indicated by the arrow D4. The width of the groove 53 (that is, the maximum width), that is, the length in the direction along the arrow D4 is L2.

In this embodiment, H2 = 1 μm, P2 = 2 μm, and L2 = 1 μm, and the arrows D3 and D4 are orthogonal to each other when viewed from the normal direction of the base surface 52. Note that the values of H2, P2, and L2 each include values that are increased or decreased by about 10%.

In the present embodiment, the thickness of the film 40A in the reverse mark 16 portion is the same as the thickness of the film 40A in the base surface 52, and the groove 53 is formed on the back side of the film 40A with respect to the reverse mark 16. Has been. However, the embodiment of the present disclosure is not limited to the above, and the thickness of the film 40 A in the inverted mark 16 may be the same as the thickness of the film 40 A at the groove bottom of the groove 53. In this case, the reverse mark 16 is formed on the back surface side of the film 40 A with respect to the base surface 52.

The groove 53 is formed in a direction perpendicular to the base surface 52, but this configuration is not limited to the case where both groove wall surfaces of the groove 53 are perpendicular to the base surface 52. For example, the groove 53 This includes the case where the distance between both wall surfaces of the groove is widened toward the base surface 52 and a straight line connecting the centers of both groove wall surfaces intersecting with a plane parallel to the base surface 52 is formed vertically.

In addition, the maximum width in the present embodiment refers to the maximum length of line segments connecting positions where both groove wall surfaces of the groove 53 intersect with a plane parallel to the base surface 52. Furthermore, the maximum width of the convex portion or the concave portion in the present disclosure refers to the maximum length of line segments connecting positions where both wall surfaces of the convex portion or the concave portion intersect with a plane parallel to the film surface.

(Tire manufacturing method)
Next, a method for manufacturing the tire 10A of the present embodiment will be described with reference to FIGS. 16A to 16D. In order to manufacture the tire 10A, first, as shown in FIG. 16A, a film 40A is attached to an inner surface 90A of a mold 90 using an adhesive layer. At this time, the film 40A is attached so as to be in contact with the surface 11A of the unvulcanized tire 11 that becomes the surface 12A of the tire side portion 12 on the outer side in the tire radial direction from the position of the tire maximum width of the tire 10A. Since it has elasticity, it is curved and pasted along the inner surface 90A of the mold 90 as shown in FIG. 16B.

Further, the unvulcanized tire 11 is arranged on the outer surface of a core (hard core) (not shown) made of metal and formed in an annular shape.

Next, as shown in FIG. 16C, the unvulcanized tire 11 is placed in the mold 90 together with the core and vulcanized. Here, the film 40 A is sandwiched between the unvulcanized tire 11 and the mold 90. At this time, in order to make it easy for the unvulcanized rubber to flow into the groove 53 of the film 40A, it is preferable to apply a rubber member having a low rubber hardness as the rubber member constituting the tire side portion 12.

Here, in the present embodiment, as a method for manufacturing the tire 10A, a method (so-called core manufacturing method) in which the unvulcanized tire 11 is placed in a mold together with a core (a so-called core manufacturing method) is used. It is not limited to. For example, a method may be used in which the unvulcanized tire 11 is placed in a mold 90 and the unvulcanized tire 11 is expanded by a bladder and vulcanized.

After vulcanization molding, the cured tire 10A is removed from the mold 90. At this time, as shown in FIG. 16D, a mark 14 (not shown) of the tire side portion 12 is formed at a position corresponding to the reverse mark 16 (not shown) of the film 40A, and corresponds to the uneven portion 50A of the film 40A. The tire side part 12 pattern part 20A is formed in the position to be.

Further, the base surface 22 of the pattern portion 20A is formed at a position corresponding to the base surface 52 of the uneven portion 50A, and the protrusion 23 of the pattern portion 20A is formed at a position corresponding to the groove 53 of the uneven portion 50A. Further, the direction of the arrow D3 in which the groove 53 extends (see FIG. 4) and the direction of the arrow D1 in which the protrusion 23 extends (see FIG. 2) coincide with each other. Further, the surface of the tire 10 A in contact with the film 40 A, that is, the base surface 22 is formed to be recessed in the tire radial direction from the surface of the tire 10 A in contact with the mold 90.

Then, the film 40A adhered to the inner surface of the mold 90 by the adhesive layer 42 is removed from the mold 90.

(Action and effect)
Next, the operation and effect of the tire manufacturing method of the present embodiment will be described.

According to the tire manufacturing method of the present embodiment, the film 40A in which the grooves 53 are arranged at equal intervals on the surface forms the inner surface of the mold, and at the time of vulcanization molding, the grooves 53 arranged in the film 40A have fluidity. High unvulcanized rubber flows in. In this state, the rubber is vulcanized and cured to form a pattern portion 20A in which linear protrusions 23 corresponding to the shape of the groove 53 are arranged at equal intervals on the surface of the tire 10A from which the film 40A has been peeled off. .

Since the depth H2 of the groove 53 of the film 40A of this embodiment is 1 μm, the interval P2 = 2 μm, and the width L2 = 1 μm, the height H1 of the protrusion 23 of the tire 10A corresponding to the groove 53 of the film 40A = 1 μm. , The interval P1 = 2 μm and the width L1 = 1 μm.

When light enters the gap between the protrusions 23, the incident light is reflected by the wall surface or the base surface 22 of the protrusion 23, and the reflected lights interfere with each other to develop a color (so-called structural color). Specifically, a rainbow-like color tone is developed in which the color tone changes depending on the viewing angle and the light incident angle.

Therefore, the contrast between the pattern portion 20A in which the protrusions 23 are arranged at equal intervals and the mark 14 formed with a smooth surface is increased, and the visibility of the pattern portion 20A and the mark 14 is improved.

Further, since the protrusions 23 are arranged at equal intervals, for example, compared with the case where the interval between the adjacent protrusions 23 is not constant, reflected light of light incident on the pattern portion 20A from the same direction is reflected over the entire pattern portion 20A. Reflect in the same way. For this reason, local variation hardly occurs in the visibility of the pattern portion 20A, and the visibility of the pattern portion 20A and the mark 14 is improved. Furthermore, since the reflection direction of light coincides with the flat base surface 22, stronger reflected light can be obtained.

In the present embodiment, the depth H2 of the groove 53 is 1 μm, the interval P2 = 2 μm, and the width L2 = 1 μm. However, the embodiment of the present disclosure is not limited to the above. For example, the depth H2 of the groove 53 may be about 0.1 μm to 1 mm. The interval P2 between the grooves 53 may be about 0.1 μm to 1 mm. The width L2 of the groove 53 may be about 0.1 μm to 1 mm. Further, with the shape of the groove 53 of the film 40A, the height H1 is about 0.1 μm to 1 mm, the interval P1 is about 0.1 μm to 1 mm, and the width L1 is about 0.1 μm. It may be about 1 μm to 1 mm. The heights H1 and H2, the intervals P1 and P2, and the widths L1 and L2 are more preferably about 0.1 to 50 μm. These numerical values are measured using an electron microscope or an atomic force microscope.

When the depth H2 of the groove 53 of the film 40A is smaller than 0.1 μm, the height H1 of the protrusion 23 of the pattern portion 20A becomes smaller than 0.1 μm, and the protrusion 23 collapses due to a change in the diameter of the rubber, resulting in a coloring effect. Get smaller. If the depth of the groove 53 is greater than 1 mm, unvulcanized rubber will not easily enter the groove 53 at the time of molding, and the shape of the protrusion 23 will be difficult to adjust (that is, the dimensional accuracy of the protrusion 23 will deteriorate).

In addition, if the depth H2 of the groove 53 becomes deep within the range of 1 mm, that is, if the height H1 of the protrusion 23 becomes high within the range of 1 mm, the incident light is reflected by the wall surface of the protrusion 23 and the base surface 22. The reflected light interferes with each other to develop a color (so-called structural color), and develops a rainbow-like color tone in which the color tone changes depending on the viewing angle and the light incident angle.

When the interval P2 between the grooves 53 is smaller than 0.1 μm, the rigidity of the portion between the adjacent grooves 53 of the film 40A is reduced, and the shape of the grooves 53 is difficult to adjust. That is, the shape of the protrusion 23 is difficult to adjust. When the interval P2 between the grooves 53 is greater than 1 mm, the interval P1 between the protrusions 23 is greater than 1 mm, and the interference between incident light is reduced. That is, the coloring effect is reduced.

When the width L2 of the groove 53 is smaller than 0.1 μm, the unvulcanized rubber is difficult to enter the groove 53 at the time of molding, and the shape of the protrusion 23 is difficult to adjust. When the width L2 of the groove 53 is larger than 1 mm, the width L1 of the protrusion 23 is larger than 1 mm, and the area occupied by the top surface of the protrusion 23 in the pattern portion 20A is increased, so that the coloring effect is reduced.

Further, in the tire manufacturing method of the present embodiment, the surface of the flat film 40A is processed, so that the grooves 53 can be formed more easily and more accurately than when the curved mold surface is processed. High processing can be achieved. Further, at the time of tire molding, the pattern portion 20A including the protrusions 23 along the curved surface can be easily formed simply by curving and sticking the film 40A along the curved surface of the mold.

Various methods can be applied as a method of forming the groove 53 in the film 40A. For example, the groove 53 may be formed by a mold having a protruding portion corresponding to the groove 53, a laser or the like. Alternatively, the groove 53 may be formed. Even when a mold having a projecting portion corresponding to the groove 53 is used, the projecting portion may be formed on the surface of the flat mold, so that the projecting portion is formed on the curved mold surface. Compared with the case where it does, it can process easily.

In addition, since the mold is not subjected to uneven processing, one mold can be used to manufacture a plurality of types of tires having different marks. Also, the rubber may stick to the uneven parts. On the other hand, when the unevenness is applied to the mold, one mold can be used only for manufacturing one kind of tire. In addition, there is a possibility that the rubber sticks to the uneven portion.

Furthermore, since the film 40A is not melted, deformed or modified when vulcanized or is so fine that it can be ignored, the film 40A can be used repeatedly. Therefore, the manufacturing efficiency of the tire is high as compared with the case where the pattern surface is formed on the tire by processing the surface of the mold.

Further, since the film 40A is attached so as to be in contact with the surface 12A of the tire side portion 12 on the outer side in the tire radial direction from the position of the tire maximum width of the tire 10A, the pattern portion 20A due to the tire coming into contact with some obstacle. The deterioration of the visibility of the mark due to the rubbing and the rubbing of the pattern portion 20A can be suppressed.

In the present embodiment, since the groove 53 of the film 40A is a linear groove, unvulcanized rubber can easily flow along the groove 53 during molding (in other words, the air in the groove 53 can easily escape) Further, the film 40 A is easily peeled in the direction along the groove 53. For this reason, the manufacturing efficiency of the tire 10A is high.

[Second Embodiment]
Hereinafter, a tire manufacturing method according to a second embodiment of the present disclosure will be described with reference to the drawings. In addition, about the part which becomes the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

(tire)
The tire 10B manufactured by the tire manufacturing method according to the present embodiment has the same configuration as the tire 10A manufactured by the tire manufacturing method according to the first embodiment.

(Pattern part)
Next, the configuration of the pattern unit 20B will be described with reference to FIG. FIG. 5 shows a recess 24 as an example of the invaginated portion. The concave portion 24 is a hemispherical hole having a depth (ie, radius) H3 bored from the base surface 22 which is the surface of the pattern portion 20B to the base surface 22, and is along the directions indicated by arrows D5 and D15 in FIG. Are arranged at equal intervals (or regular) at intervals P3. Further, the diameter (that is, the maximum width) of the recess 24 at the base surface 22 is L3.

In this embodiment, H3 = 2 μm, P3 = 6 μm, and L3 = 4 μm. Further, the arrow D5 and the arrow D15 intersect each other at 60 ° when viewed from the normal direction of the base surface 22. Note that the values of H3, P3, and L3 each include values that are increased or decreased by about 10%.

(the film)
Next, returning to FIG. 3, the structure of the film 40B for forming the recess 24 will be described. As shown in FIG. 3, on the surface of the film 40 B, an inverted mark 16 formed as a smooth surface and an uneven part 50 B surrounding each component 16 A constituting the inverted mark 16 are formed. .

The inverted mark 15 has a shape obtained by inverting the mark 14, and the component 15 A has a shape obtained by inverting the component 14 A. An adhesive layer 42 is formed on the back surface of the film 40B, and a release paper (not shown) is attached to the back surface of the adhesive layer 42.

(Uneven portion)
Next, with reference to FIG. 6, the structure of the uneven | corrugated | grooved part 50B of the film 40B is demonstrated. FIG. 6 shows a protrusion 54 as an example of a convex portion in the present disclosure. The protrusion 54 is a hemispherical protrusion having a height (ie, radius) H4 formed on the base surface 52 from the base surface 52, which is the surface of the concavo-convex portion 50B, along the directions indicated by arrows D6 and D16 in FIG. They are arranged at regular intervals (or regularly) at intervals P4. Further, the diameter (that is, the maximum width) of the protrusion 54 on the base surface 52 is L4.

In this embodiment, H4 = 2 μm, P4 = 6 μm, and L4 = 4 μm. Further, the arrow D6 and the arrow D16 intersect each other at 60 ° when viewed from the normal direction of the base surface 52. Note that the values of H4, P4, and L4 each include a value that is increased or decreased by about 10%.

In the present embodiment, the thickness of the film 40B in the inverted mark 16 portion is the same as the thickness of the film 40B in the base surface 52, and the protrusion 54 is formed on the outer side of the film 40A with respect to the inverted mark 16. ing.

In addition, in the recessed part 24 and the protrusion 54 in the present embodiment, the hemispherical shape does not necessarily indicate a half shape of a true sphere, and may be a shape of a part of a true sphere or a flat shape such as an elliptical sphere. Any solid shape may be used as long as the wall surface is formed into a curved shape, such as a shape of a part of a sphere or a shape formed by rotating a suspension curve around an axis.

(Tire manufacturing method)
The manufacturing method of the tire 10B of the present embodiment is the same as the manufacturing method of the tire 10A of the first embodiment. At this time, the mark 14 of the tire side portion 12 is formed at a position corresponding to the reverse mark 16 of the film 40B, and the pattern portion 20B of the tire side portion 12 is formed at a position corresponding to the uneven portion 50B of the film 40B. The

Furthermore, the base surface 22 of the pattern portion 20B is formed at a position corresponding to the base surface 52 of the uneven portion 50B, and the concave portion 24 of the pattern portion 20B is formed at a position corresponding to the protrusion 54 of the uneven portion 50B. In addition, the direction of the arrow D6 in which the protrusion 54 extends and the direction of the arrow D5 in which the recess 24 is extended coincide with each other.

(Action and effect)
Next, the operation and effect of the tire manufacturing method of the present embodiment will be described. In addition, description is abbreviate | omitted about the effect obtained by the structure similar to the manufacturing method of the tire of 1st Embodiment.

According to the tire manufacturing method of this embodiment, unvulcanized rubber having high fluidity flows into the gaps between the protrusions 54 arranged on the film 40B during vulcanization molding. In this state, the rubber is vulcanized and cured, whereby a pattern portion 20B in which the recesses 24 corresponding to the shape of the protrusions 54 are arranged at equal intervals is formed on the surface of the tire 10B from which the film 40B has been peeled off.

Since the height H4 = 2 μm of the protrusions 54 of the film 40B of the present embodiment, the interval P4 = 6 μm, and the diameter L4 = 4 μm, the depth H3 = 2 μm of the recess 24 of the tire 10B corresponding to the protrusions 54 of the film 40B. , The interval P3 = 6 μm and the diameter L3 = 4 μm.

When light enters the concave portion 24, the incident light is reflected by the wall surface of the concave portion 24, and the reflected lights interfere with each other to develop a color (so-called structural color). Specifically, a rainbow-like color tone is developed in which the color tone changes depending on the viewing angle and the light incident angle.

In the present embodiment, since the wall surface of the recess 24 is formed in a curved surface, incident light incident from the same direction is reflected in various directions. Therefore, the interference effect of reflected light is enhanced, and a complex color tone can be given to the pattern portion 20B. Furthermore, since the recesses 24 are arranged at regular intervals along arrows D5 and D15 that intersect at an angle of 60 °, the arrangement pattern has less directivity compared to the protrusions 23 of the first embodiment. Therefore, since there is little difference in color tone depending on the viewing direction, the same visibility can be given to the pattern portion 20B from any direction.

Therefore, the contrast between the pattern portion 20B in which the concave portions 24 are arranged at equal intervals and the mark 14 is increased, and the visibility of the pattern portion 20B and the mark 14 is improved. Furthermore, since the reflection direction of light coincides with the flat base surface 22, stronger reflected light can be obtained.

In the present embodiment, the height H4 of the protrusions 54 is 2 μm, the interval P4 is 6 μm, and the diameter L4 is 4 μm. However, the embodiment of the present disclosure is not limited to the above. For example, the height H4 of the protrusion 54 may be about 0.1 μm to 1 mm. Further, the interval P4 between the protrusions 54 may be about 0.1 to 1 mm. Further, the diameter L4 of the protrusion 54 may be about 0.1 μm to 1 mm. Further, along with the shape of the protrusion 54 of the film 40B, the depth H3 is about 0.1 μm to 1 mm, the interval P3 is about 0.1 μm to 1 mm, and the diameter L3 is about 0.1 μm. It may be about 1 μm to 1 mm. The heights H3 and H4, the intervals P3 and P4, and the diameters L3 and L4 are more preferably about 0.1 to 50 μm.

If the height H4 of the protrusion 54 is smaller than 0.1 μm, the depth H3 of the concave portion 24 becomes smaller than 0.1 μm, and the interference between incident light is reduced. That is, the coloring effect is reduced. Further, the concave portion 24 collapses due to the change in the diameter of the rubber, and the coloring effect is reduced. If the height H4 of the protrusion 54 is greater than 1 mm, the depth H3 of the recess 24 will be greater than 1 mm, and the recess 24 is likely to be clogged with dust and the like during use of the tire, deteriorating the tire appearance.

When the interval P4 between the protrusions 54 is smaller than 0.1 μm, the interval P3 between the recesses 24 is smaller than 0.1 μm, the rigidity of the rubber between the adjacent recesses 24 is reduced, and the shape of the recesses 24 is adjusted. It becomes difficult. When the interval P4 between the protrusions 54 is greater than 1 mm, the interval P3 between the recesses 24 is greater than 1 mm, and the interference between incident light is reduced. That is, the coloring effect is reduced.

When the diameter L4 of the protrusion 54 is smaller than 0.1 μm, the diameter L3 of the concave portion 24 becomes smaller than 0.1 μm, and the interference between incident lights is reduced. That is, the coloring effect is reduced. Further, the concave portion 24 collapses due to the change in the diameter of the rubber, and the coloring effect is reduced. When the diameter L4 of the protrusion 54 is larger than 1 mm, the diameter L3 of the concave portion 24 becomes larger than 1 mm, and the concave portion 24 is easily clogged with dust and the like during use of the tire, thereby deteriorating the tire appearance.

Further, in the present embodiment, since the projection 54 as an example of the convex portion in the present disclosure of the film 40B is hemispherical, the projection 54 is difficult to peel off from the film 40B. Further, the cured rubber and the film 40B are easily peeled off. For this reason, durability of a film becomes high.

[Modification]
Next, various modifications of the above embodiment will be described. In addition, about the part which becomes the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

(Modification 1)
First, the pattern part 20C and the film 40C according to Modification 1 will be described.

(Pattern part)
Next, the configuration of the pattern unit 20C according to the first modification will be described with reference to FIG. In FIG. 7, a recess 25 is shown as an example of the intrusion portion. The recess 25 is a cylindrical hole having a depth H5 that is drilled in a direction perpendicular to the base surface 22 from the base surface 22 that is the surface of the pattern portion 20C. A bottom surface parallel to the surface 22 is provided. Further, the recesses 25 are arranged at equal intervals at intervals P5 along the directions indicated by arrows D7 and D17 in FIG. The diameter (that is, the maximum width) of the recess 25 is L5.

In this embodiment, H5 = 1 μm, P5 = 2 μm, and L5 = 1 μm. Further, the arrow D7 and the arrow D17 intersect each other at 60 ° when viewed from the normal direction of the base surface 22. Note that the values of H5, P5, and L5 each include values that are increased or decreased by about 10%.

The concave portion 25 is formed in a direction perpendicular to the base surface 22, but this configuration is not limited to the case where the wall surface of the concave portion 25 is perpendicular to the base surface 22, for example, the diameter of the concave portion 25. Includes a case where a straight line connecting the center of the wall surface of the recess 25 intersecting with a plane parallel to the base surface 22 is formed vertically.

(the film)
Next, with reference to FIG. 8, the structure of the uneven | corrugated | grooved part 50C of the film 40C for forming the recessed part 25 is demonstrated. FIG. 8 shows a protrusion 55 as an example of a convex portion in the present disclosure. The protrusion 55 is a columnar protrusion having a height H6 formed in a direction perpendicular to the base surface 52 from the base surface 52 that is the surface of the uneven portion 50C. A top surface parallel to the surface 52 is provided. Further, the protrusions 55 are arranged at equal intervals at intervals P6 along the directions indicated by arrows D8 and D18 in FIG. The diameter (that is, the maximum width) of the protrusion 55 is L6.

In this embodiment, H6 = 1 μm, P6 = 2 μm, and L6 = 1 μm. Further, the arrow D8 and the arrow D18 intersect each other at 60 ° when viewed from the normal direction of the base surface 52. Note that the values of H6, P6, and L6 each include values that are increased or decreased by about 10%.

Further, the shape of the protrusion 55 of the film 40C is not limited to the above. For example, the height H6 may be about 0.1 μm to 1 mm, the interval P6 may be about 0.1 μm to 1 mm, and the diameter L6 is About 0.1 μm to 1 mm. Further, along with the shape of the protrusion 55 of the film 40C, the height H5 is about 0.1 μm to 1 mm, the interval P5 is about 0.1 μm to 1 mm, and the diameter L5 is 0 for the shape of the concave portion 25 of the corresponding pattern portion 20C. It may be about 1 μm to 1 mm. The heights H5 and H6, the intervals P5 and P6, and the diameters L5 and L6 are more preferably about 0.1 to 50 μm.

The protrusion 55 is formed in a direction perpendicular to the base surface 52, but this configuration is not limited to the case where the wall surface of the protrusion 55 is perpendicular to the base surface 52. For example, the diameter of the protrusion 55 is Includes a case where a straight line connecting the centers of the wall surfaces of the protrusions 55 intersecting with a plane parallel to the base surface 52 is formed vertically.

(effect)
In the first modification, light incident on the wall surface of the concave portion 25 is reflected toward the bottom surface of the concave portion 25, and light incident on the bottom surface of the concave portion 25 is directed outward of the concave portion 25. Reflect. For example, when light is incident from an angle close to a direction parallel to the base surface 22, the incident light is repeatedly reflected on the wall surface of the recess 25, and the light attenuation effect is enhanced. In addition, when light is incident from an angle close to the normal direction of the base surface 22, the incident light is also reflected from the bottom surface of the recess 25, so that the interference effect between the reflected light is enhanced. Therefore, it is possible to give the pattern portion 20C an effect of producing a different color tone depending on the difference in incident light angle.

(Modification 2)
Next, the pattern part 20D and the film 40D according to Modification 2 will be described.

(Pattern part)
First, with reference to FIG. 9, the structure of the pattern part 20D which concerns on the modification 1 is demonstrated. In FIG. 9, a net-like protrusion 26 is shown as an example of the protrusion. The mesh projection 26 is a hexagonal mesh projection having a height H7 that is erected in a direction perpendicular to the base surface 22 from the base surface 22 that is the surface of the pattern portion 20D. The net-like protrusions 26 are arranged so that two opposite sides of the regular hexagon intersect each other at right angles with respect to the directions indicated by arrows D9 and D19 in FIG. 9, and the regular hexagons are arranged at equal intervals with a center interval P7. ing. Further, each regular hexagonal portion surrounded by the net-like protrusions 26 has a diameter of a circle circumscribing the regular hexagon (that is, the maximum width of the regular hexagon) is L7, and is configured to be flat at a height equal to the base surface 22. Yes.

In this embodiment, H7 = 10 μm, P7 = 40 μm, and L7 = 30 μm. Further, the arrow D9 and the arrow D19 intersect each other at 60 ° when viewed from the normal direction of the base surface 22. Note that the values of H7, P7, and L7 each include values that are increased or decreased by about 10%.

(the film)
Next, with reference to FIG. 10, the structure of the uneven | corrugated | grooved part 50D of film 40D for forming the net-like protrusion 26 is demonstrated. FIG. 10 shows a mesh groove 56 as an example of a recess in the present disclosure. The mesh groove 56 is a hexagonal mesh groove having a depth H8 that is perforated in a direction perpendicular to the base surface 52 from the base surface 52 that is the surface of the concavo-convex portion 50D, and is indicated by arrows D10 and D110 in FIG. Two opposite hexagonal sides are arranged so as to intersect at right angles with respect to the direction, and the regular hexagons are arranged at equal intervals with a center interval P8. Each regular hexagonal portion surrounded by the net-like groove 56 has a diameter of a circle circumscribing the regular hexagon (that is, the maximum width of the regular hexagon) as L8, and is configured to be flat at a height equal to the base surface 52. .

In this embodiment, H8 = 10 μm, P8 = 40 μm, and L8 = 40 μm. The arrow D10 and the arrow D110 intersect each other at 60 ° when viewed from the normal direction of the base surface 52. Note that the values of H8, P8, and L8 each include a value increased or decreased by about 10%.

Further, the shape of the mesh groove 56 of the film 40D is not limited to the above. For example, the height H8 may be about 0.1 μm to 1 mm, and the interval P8 may be about 0.1 μm to 1 mm. The diameter L8 of the circle inscribed by each regular hexagon surrounded by 56 may be about 0.1 to 1 mm. Further, along with the shape of the mesh groove 56 of the film 40D, the shape of the mesh projection 26 of the corresponding pattern portion 20D is about 0.1 μm to 1 mm in height H7 and about 0.1 μm to 1 mm in the interval P7. The diameter L7 of the circle inscribed by each regular hexagon surrounded by 26 may be about 0.1 μm to 1 mm. The heights H7 and H8, the intervals P7 and P8, and the diameters L7 and L8 are more preferably about 0.1 to 50 μm.

Furthermore, in the present embodiment, the mesh groove 56 is a hexagonal mesh groove, but the embodiment of the present disclosure is not limited thereto. For example, it may be a mesh-shaped protrusion that is regularly arranged, such as a rectangular mesh shape or a triangular mesh shape.

(effect)
In the second modified example, hexagonal mesh-like projections 26 are formed so as to surround portions that are flat at the same height as the respective base surfaces 22. The light incident on the mesh projections 26 and the vicinity of the mesh projections 26 is reflected on the mesh projections 26 to obtain an interference effect, while the light incident on the position away from the mesh projections 26 is the same as the light reflected on the mesh projections 26. Does not interfere. Accordingly, the pattern portion 20D is configured by a portion where the light interference effect can be obtained along the mesh protrusions 26 and a portion surrounded by the portion where the light interference effect can be obtained and where the light interference effect cannot be obtained. . At this time, if the mesh of the hexagonal mesh is made finer, the proportion of the portion where the light interference effect is obtained increases, and if the mesh of the hexagonal mesh is made coarse, the proportion of the portion where the light interference effect is obtained becomes small. Therefore, the degree of increasing the visibility of the pattern portion 20D can be arbitrarily adjusted.

Also, since the rubber flows along the mesh, for example, compared with a case where the holes are regularly arranged, partial rubber chipping is less likely to occur.

(Modification 3)
Next, the pattern part 20E and the film 40E according to Modification 3 will be described.

(Pattern part)
First, with reference to FIG. 11, the structure of the pattern part 20E which concerns on the modification 3 is demonstrated. FIG. 11 shows a columnar protrusion 27 as an example of the protruding portion. The columnar protrusion 27 is a columnar protrusion having a height H9 erected from the base surface 22 that is the surface of the pattern portion 20E with respect to the base surface 22 (that is, a vertical height from the base surface 22). Are arranged at equal intervals at intervals P9 along the directions indicated by arrows D11 and D111. The top surface 27T of the columnar protrusion 27 is formed in parallel with the base surface 22, and the diameter (maximum width) of the top surface 27T is L9. In addition, the inclination angle of the columnar protrusion 27 with respect to the vertical direction of the base surface 22 is θ, and is inclined along the direction indicated by the arrow D11.

In this embodiment, H9 = 20 μm, P9 = 40 μm, L9 = 10 μm, and θ = 15 °. Further, D11 and D111 are set to intersect at right angles. Note that the values of H9, P9, and L9 each include values that are increased or decreased by about 10%.

(the film)
Next, with reference to FIG. 12, the structure of the uneven | corrugated | grooved part 50E of the film 40E for forming the columnar protrusion 27 is demonstrated. FIG. 12 shows a hole 57 as an example of a recess in the present disclosure. The hole 57 is a cylindrical hole having a depth H10 that is inclined from the base surface 52, which is the surface of the concavo-convex portion 50E, with respect to the base surface 52, and is along the directions indicated by arrows D12 and D112 in FIG. Are arranged at equal intervals at intervals P10. The bottom surface 57T of the hole 57 is formed in parallel with the base surface 52, and the diameter (that is, the maximum width) of the bottom surface 57T is L10. The inclination angle of the hole 57 with respect to the vertical direction of the base surface 52 is θ, and the hole 57 is inclined along the direction indicated by the arrow D12.

In this embodiment, H10 = 20 μm, P10 = 40 μm, L10 = 10 μm, and θ = 15 °. Further, D12 and D112 are in a direction intersecting at right angles to each other. Note that the values of H10, P10, and L10 each include values that are increased or decreased by about 10%.

The shape of the hole 57 of the film 40E is not limited to the above. For example, the height H10 may be about 0.1 μm to 1 mm, the interval P10 may be about 0.1 μm to 1 mm, and the diameter L10 is About 0.1 μm to 1 mm. Further, along with the shape of the hole 57 of the film 40E, the height H9 is about 0.1 μm to 1 mm, the interval P9 is about 0.1 μm to 1 mm, and the diameter L9 is about the shape of the columnar protrusion 27 of the corresponding pattern portion 20E. It may be about 0.1 to 1 mm. The heights H9 and H10, the intervals P9 and P10, and the diameters L9 and L10 are more preferably about 0.1 to 50 μm.

In the present embodiment, the cross-sectional shape of the hole 57 that intersects the surface parallel to the base surface 52 is a perfect circle. However, the embodiment of the present disclosure is not limited to the above, and for example, parallel to the base surface 52. The cross-sectional shape of the hole 57 that intersects the surface may be an elliptical shape or an oval shape. Further, the inclination angle θ of the hole 57 with respect to the vertical direction of the base surface 52 is 15 °, but the embodiment of the present disclosure is not limited to the above, and may be about 0 ° to 30 °. When the inclination angle θ of the hole 57 with respect to the vertical direction of the base surface 52 is larger than 30 °, the film 40E is hardly peeled from the tire surface after vulcanization. Thereby, the appearance of the reflected light can be adjusted.

(Modification 4)
Next, the pattern part 20F and the film 40F according to Modification 4 will be described.

(Pattern part)
First, with reference to FIG. 13, the structure of the pattern part 20F which concerns on the modification 4 is demonstrated. FIG. 13 shows a conical protrusion 28 as an example of the protruding portion. The conical protrusion 28 is a conical protrusion having a height H11 (vertical height from the base surface 22) H11 erected from the base surface 22 which is the surface of the pattern portion 20F. Are arranged at equal intervals at intervals P11 along the directions indicated by arrows D13 and D113. The diameter (that is, the maximum width) of the bottom surface 28T of the base surface 22 of the conical protrusion 28 is L11.

In this embodiment, H11 = 20 μm, P11 = 40 μm, and L11 = 10 μm. Further, D13 and D113 are in a direction intersecting at right angles to each other. Note that the values of H11, P11, and L11 each include values that are increased or decreased by about 10%.

(the film)
Next, with reference to FIG. 14, the structure of the uneven | corrugated | grooved part 50F of the film 40F for forming the conical protrusion 28 is demonstrated. FIG. 14 shows a hole 58 as an example of a recess according to the present disclosure. The holes 58 are conical holes with a depth H12 formed in the base surface 52, which is the surface of the concavo-convex portion 50F, and are arranged at equal intervals along the direction indicated by arrows D14 and D114 in FIG. ing. The diameter (that is, the maximum width) of the hole 58 in the base surface 52 is L12.

In this embodiment, H12 = 20 μm, P12 = 40 μm, and L12 = 10 μm. Further, D14 and D114 are in a direction intersecting at right angles to each other. Note that the values of H12, P12, and L12 each include a value increased or decreased by about 10%.

The shape of the hole 58 of the film 40F is not limited to the above. For example, the height H12 may be about 0.1 μm to 1 mm, the interval P12 may be about 0.1 μm to 1 mm, and the diameter L12 is About 0.1 μm to 1 mm. Further, along with the shape of the hole 58 of the film 40F, the height H11 is about 0.1 μm to 1 mm, the interval P11 is about 0.1 μm to 1 mm, and the diameter L11 is the shape of the conical protrusion 28 of the corresponding pattern portion 20F. May be about 0.1 μm to 1 mm. The heights H11 and H12, the intervals P11 and P12, and the diameters L11 and L12 are more preferably about 0.1 to 50 μm.

Further, in the present embodiment, the cross-sectional shape of the hole 58 that intersects the surface parallel to the base surface 52 is a perfect circle, but the embodiment of the present disclosure is not limited to the above, and for example, parallel to the base surface 52 The cross-sectional shape of the hole 58 that intersects the surface may be elliptical or elliptical. Thereby, the appearance of the reflected light can be adjusted.

In the present embodiment, the tip of the hole 58 is pointed, but the embodiment of the present disclosure is not limited to the above, and a bottom surface may be formed at the tip, for example. Thereby, the shape of the conical protrusion 28 formed by the hole 58 is stabilized, and durability is increased.

The embodiments of the present disclosure have been described above with reference to the embodiments. However, these embodiments are examples, and various modifications can be made without departing from the scope of the invention. It goes without saying that the scope of rights of the present disclosure is not limited to these embodiments.

For example, in the first embodiment, as shown in FIG. 1, the component 14A of the mark 14 is surrounded by a decorative pattern portion 20A, but the embodiment of the present disclosure is not limited to this configuration. For example, as shown in FIG. 15, a component of a mark may be formed by a pattern portion 20A, and a portion adjacent to the pattern portion 20A may be a smoothing portion 17. In this case, a film having an uneven portion corresponding to the pattern portion 20A corresponding to each component may be manufactured for each component and attached to the inner surface of the mold. Alternatively, when the pattern portion 20A is formed over the entire tire circumferential direction of the surface 12A of the tire side portion 12, a single annular film is arranged so as to cover the surface 12A of the tire side portion 12 and the mold You may affix on the inner surface of. As described above, the film can be appropriately divided in the tire circumferential direction, or can be configured as a single piece continuous in the tire circumferential direction. In addition, about the structure which forms the component of a mark in the said pattern part 20A, you may apply in 2nd Embodiment and each modification.

In the first embodiment, the pattern portion 20A is formed on the surface 12A of the tire side portion 12 on the outer side in the tire radial direction from the position of the tire maximum width of the tire 10A. However, the embodiment of the present disclosure has this configuration. It is not limited. For example, it may be inside in the tire radial direction from the position of the tire maximum width of the tire 10A. Further, in addition to or instead of the surface 12A, a pattern portion 20A may be provided in a bead portion that contacts a rim (not shown). By providing the pattern portion 20A in the bead portion, the frictional force between the surface of the tire 10A and the rim surface is improved. Alternatively, the pattern portion 20A may be formed on a drainage groove (not shown) formed on the tread surface, a bottom surface or a side surface of a sipe. Specifically, the pattern portion 20A is formed on the groove bottom surface and side surface of the groove continuously extending in the tire circumferential direction, the groove bottom surface and groove side surface of the groove extending in the tire radial direction, the bottom surface and side surface of the sipe formed on the tread surface, and the like. May be formed. Alternatively, the pattern portion 20A may be formed on the tread surface in contact with the road surface, the inside of the tire (inner liner surface), or the like. In these cases, the film 40A is affixed to the inner surface of the mold 90 corresponding to each of the above portions. In addition, about the structure which forms pattern part 20A in each said part, you may apply to 2nd Embodiment and each modification.

In the first embodiment, the grooves 53 are arranged at equal intervals with the interval P2, but the configuration of the present disclosure is not limited to this. For example, a case where a group of a plurality of adjacent grooves 53 that are not equally spaced from each other is continuously arranged is also included in the regular arrangement in the present disclosure. That is, it is only necessary that a set of grooves 53 having one or more fixed sets is repeatedly arranged.

In the first embodiment, the tire 10A is a pneumatic tire, but the embodiment of the present disclosure is not limited to this configuration, and the tire 10A may be a solid tire. Similarly, the tire 10B of the second embodiment and the tires of the respective modifications may be solid tires.

In the first embodiment, the adhesive layer 42 is formed on the back surface of the film 40A, and the film 40A is attached using the adhesive layer 42. However, the embodiment of the present disclosure is not limited to the above. For example, the film 40A may be attached to the unvulcanized tire so that the uneven portion 50A of the film 40A faces the surface of the unvulcanized rubber tire. In this case, the film 40A may be attached to the surface of the unvulcanized tire by utilizing the adhesiveness of the unvulcanized tire. Similarly, the film 40B of the second embodiment and the film of each modified example may be attached to the surface of the unvulcanized tire.

In the first embodiment, the film 40A is formed of a material such as polyimide, polyethylene naphthalate (PEN), polypropylene, polyethylene terephthalate (PET), cycloolefin polymer (COP), or cycloolefin copolymer (COC). However, embodiments of the present disclosure are not limited to the above. For example, when placed between a mold for vulcanizing a tire and an unvulcanized tire and vulcanized, heat resistance that does not cause melting, deformation, or modification, or is negligibly fine Any elastic film may be used.

Furthermore, in the first embodiment, the film 40A is formed of a single material, but the embodiment of the present disclosure is not limited to the above. For example, a multilayer structure in which a plurality of materials are combined may be used, or a surface material on which fine unevenness processing is performed may be combined with a strong base material. Moreover, in order to make it easy to peel from the tire surface after vulcanization, a coating treatment or the like may be performed. Similarly, the film 40B of the second embodiment and the film of each modification need not necessarily be formed of the above materials.

The entire disclosure of Japanese Patent Application No. 2015-224243 filed on November 16, 2015 is incorporated herein by reference. All documents, patent applications, and technical standards mentioned in this specification are to the same extent as if each individual document, patent application, and technical standard were specifically and individually described to be incorporated by reference, Incorporated herein by reference.

Claims

A method for manufacturing a tire, wherein a heat-resistant film having convex portions or concave portions regularly arranged on a surface is placed in a mold so that the surface is in contact with an unvulcanized tire, and the unvulcanized tire is vulcanized and molded. .
The tire manufacturing method according to claim 1, wherein the heat-resistant film is formed in a flat plate shape, curved along the inner surface of the mold, and disposed in the mold.
The height of the convex part and the depth of the concave part are 0.1 μm to 1 mm,
The tire manufacturing method according to claim 1 or 2, wherein an interval between the adjacent convex portions and an interval between the adjacent concave portions are 0.1 μm to 1 mm.
The method for manufacturing a tire according to any one of claims 1 to 3, wherein a maximum width of the convex portion and a maximum width of the concave portion are 0.1 μm to 1 mm.
The tire manufacturing method according to any one of claims 1 to 4, wherein the heat-resistant film is disposed so as to contact a side portion of the unvulcanized tire.
The tire according to any one of claims 1 to 5, wherein a tire surface in a portion in contact with the heat resistant film is formed to be recessed inward in a tire radial direction from a tire surface in a portion in contact with the mold. Production method.
The heat-resistant film has a flat portion surrounded by a portion where the convex portions or the concave portions are arranged, and the flat portion is an inverted mark in which a mark made of letters, numbers, symbols, figures, etc. is reversed. The method for manufacturing a tire according to any one of claims 1 to 6.
The heat-resistant film has a flat portion surrounding a portion where the convex portion or the concave portion is arranged, and the portion where the convex portion or the concave portion is arranged is a mark made of letters, numbers, symbols, figures, or the like. The method for manufacturing a tire according to any one of claims 1 to 6, wherein the tire is an inverted inversion mark.