JP6064661B2 - Pneumatic tire manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a pneumatic tire with improved wet performance and a pneumatic tire obtained by this method.

  Conventionally, pneumatic tires with improved wet performance are known (see, for example, Patent Documents 1 and 2). The technique disclosed in Patent Document 1 is a technique in which tread rubber and water-repellent rubber or hydrophilic rubber are alternately arranged in the tire radial direction to provide a rectifying action in the longitudinal direction of the groove. The technique disclosed in Patent Document 2 is a technique in which an outer layer made of a highly water-repellent material is formed on the surface of the main groove.

JP 2001-287509 A JP-A-9-164809

  In the technique disclosed in Patent Document 1, since the tread rubber and the water repellent rubber are simply arranged alternately in the tire radial direction, the pattern formed by the boundary line between these rubbers is always the length of the groove. The stripe shape is parallel to the direction. For this reason, depending on this technology, the pattern composed of the boundary line appearing in the groove cannot be made into a complicated type or various types, and as a result, a rectifying action rich in variations based on various patterns can be brought about. Can not.

  In the technique disclosed in Patent Document 2, since only a single water-repellent rubber is disposed in the groove, as in the technique disclosed in Patent Document 1, a variety of rectifying actions can be brought about. Can not.

  The present invention has been made in view of the above circumstances, and in improving the wet performance, it is possible to make a pattern composed of a boundary line between rubbers appearing in the groove into a wide variety of types. It is an object of the present invention to provide a method for manufacturing a pneumatic tire and a pneumatic tire obtained by this method, which can provide a variety of rectifying actions based on the pattern.

  The method for producing a pneumatic tire according to the present invention includes a step of forming at least one outer layer made of a thermoplastic elastomer composition containing a mixture of a thermoplastic resin and an elastomer on the surface of a tread groove, And a step of removing at least a part by laser processing or buffing.

  Moreover, the pneumatic tire according to the present invention is a pneumatic tire obtained by such a manufacturing method.

  In the method for manufacturing a pneumatic tire according to the present invention, one or a plurality of outer layers made of a specific composition are formed on the surface of the tread groove, and a predetermined region of the outer layer is removed by laser processing or the like. As a result, in the pneumatic tire obtained by this manufacturing method, in improving the wet performance, the pattern composed of the boundary line between the rubbers appearing in the groove can be made into a wide variety of types. Based on the pattern, a variety of rectifying effects can be provided.

FIG. 1 is a perspective view showing a state of a tread surface of a tire material (tread rubber) in each manufacturing process of a manufacturing method of a pneumatic tire according to the present embodiment, and (a) is a processing state of the tire material, (B) shows a state in which an outer layer is formed, (c) shows a state after laser processing, and (d) shows a state after vulcanization. FIG. 2 is a perspective view showing the state of the tread surface of the tire material (tread rubber) in each manufacturing process of the manufacturing method of the pneumatic tire according to the present embodiment, and (a) is a processing state of the tire material, (B) shows a state in which an outer layer has been formed, (c) shows a state after vulcanization, and (d) shows a state after buffing. FIG. 3 is a perspective view showing an example of a surface state of a groove obtained by the method for manufacturing a pneumatic tire according to the present embodiment. FIG. 4 is a perspective view illustrating an example of a surface state of a groove obtained by the method for manufacturing a pneumatic tire according to the present embodiment. FIG. 5 is a perspective view showing a plurality of examples of the surface state of the groove obtained by the method for manufacturing a pneumatic tire according to the present embodiment, wherein (a) shows a dimple shape on the outer layer, and (b) shows a zigzag outer layer. (C) is an example of the outer layer being wavy, and (d) is an example of the outer layer being a combination of a dimple shape and a linear shape.

  DESCRIPTION OF EMBODIMENTS Embodiments of a method for manufacturing a pneumatic tire according to the present invention (basic forms (basic forms 1 and 2) and additional forms 1 to 6 shown below) will be described in detail with reference to the drawings. Note that these embodiments do not limit the present invention. In addition, the constituent elements of the above embodiment include those that can be easily replaced by those skilled in the art, or those that are substantially the same. Furthermore, various forms included in the above-described embodiment can be arbitrarily combined within a range obvious to those skilled in the art.

[Basic form]
Below, the basic form is demonstrated about the pneumatic tire which concerns on this invention. In the following description, the tire radial direction means a direction orthogonal to the rotational axis of the pneumatic tire, the tire radial inner side is the side toward the rotational axis in the tire radial direction, and the tire radial outer side is in the tire radial direction. The side away from the rotation axis. The tire circumferential direction refers to a circumferential direction with the rotation axis as a central axis. Furthermore, the tire width direction refers to a direction parallel to the rotation axis.

(Manufacturing method of basic form 1)
The basic form 1 is a form in which laser processing is used for applying a pattern to the tread surface of the tire material (tread rubber). The method for manufacturing a pneumatic tire according to the present embodiment includes normal manufacturing processes, that is, a tire material mixing process, a tire material processing process, a green tire molding process, a vulcanization process, and an inspection process after vulcanization. Etc. The method for manufacturing a pneumatic tire according to the present embodiment particularly includes the following two steps between the tire material processing step and the green tire molding step, that is, the outer layer forming step on the tire material (tread rubber). (Hereinafter, sometimes referred to as “outer layer forming step”) and a step of removing a part of the outer layer by laser processing (hereinafter, sometimes referred to as “outer layer removing step 1”). In the following, the outer layer forming step, the outer layer removing step 1 and the like specific to the present embodiment will be described in detail.

  FIG. 1 is a perspective view showing a state of a tread surface of a tire material (tread rubber) in each manufacturing process of the manufacturing method of the pneumatic tire according to the present embodiment. In the same figure, (a) is a processing state of the tire material, (b) is a state in which an outer layer is formed, (c) is a state in which laser processing is performed, and (d) is a state after vulcanization. It is.

<Outer layer forming step>
In this step, the processed tire material (tread rubber) has at least an outer layer made of a thermoplastic elastomer composition containing a mixture of a thermoplastic resin and an elastomer at a predetermined portion of the region 10 that becomes the tread surface after vulcanization. One layer, in the example shown in FIG. 1, is a step of forming the outer layer 30 (FIGS. 1A to 1B).

  In the present embodiment, the predetermined portion of the region 10 refers to a portion that becomes a tread groove by vulcanization. Here, the groove of the tread includes a groove extending in any direction that defines various tread patterns defined on the tread surface of the vulcanized tire. That is, the groove of the tread may be a groove extending in the tire circumferential direction (hereinafter sometimes referred to as a “tire circumferential groove”), or a groove inclined to the tire circumferential direction (tire It may include a groove extending in the width direction and may hereinafter be referred to as a “tire inclined groove”. Moreover, when a groove | channel is a tire inclination groove | channel, the groove | channel which is not connected is included as well as the groove | channel which the one end communicates with the circumferential direction groove | channel. Further, the groove includes a so-called sipe. In FIG. 1B, it is assumed that the predetermined portion corresponding to an arbitrary groove among these grooves is shown.

  The thermoplastic elastomer composition is obtained by mixing a thermoplastic resin and an elastomer component and dispersing the elastomer component as a discontinuous phase in a matrix of the thermoplastic resin. Among such thermoplastic elastomer compositions, those obtained by vulcanizing an elastomer component dispersed as a discontinuous phase during kneading are preferable because they have a stable dispersion structure.

  Examples of the thermoplastic resin include polyamide resins such as nylon 6 and nylon 66, polyester resins such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT) and polyethylene isophthalate (PEI), and polyacrylonitrile (PAN). Polynitrile resins, polymethacrylate resins such as polymethyl methacrylate (PMMA), polyvinyl resins such as vinyl acetate (EVA) and polyvinyl alcohol (PVA), polyvinylidene fluoride (PVDF), and polyvinyl fluoride (PVF) And imide resins such as aromatic polyimide (PI), polyvinylidene chloride (PVDC), and polyvinyl chloride (PVC).

  Examples of the elastomer component include natural rubber (NR), isoprene rubber (IR), diene rubbers such as styrene-butadiene copolymer rubber (SBR) and butadiene rubber (BR), and ethylene propylene rubber (EPDM, EPM). Olefin rubbers, and halogen rubbers such as brominated butyl rubber (Br-IIR) and chlorinated butyl rubber (Cl-IIR).

  In the present embodiment, at least one outer layer is formed. In the example shown in FIG. 1, the outer layer 30 (FIG. 1B) is formed as the outer layer. The outer layer 30 is formed by sticking a film-like material or a sheet-like material made of a thermoplastic elastomer composition to a tread rubber.

  The affixing can be performed simply by laminating the outer layer 30 at a predetermined location in the tread rubber region 10. In the present embodiment, since the outer layer 30 is attached to the tread rubber, which is a tire material, before the green tire is molded, the attaching accuracy and workability of the outer layer 30 are excellent.

  As described above, a thermoplastic elastomer composition containing a mixture of the thermoplastic resin and the elastomer is formed at a predetermined position in the region 10 of the processed tire material (tread rubber). In the example shown in FIG. 1B, a predetermined portion of the tread rubber region 10 is covered with the outer layer 30.

  In the example shown in FIG. 1B, the outer layer is one layer, but the present embodiment is not limited to this, and the outer layer may be a plurality of layers. When making an outer layer into multiple layers, the film which laminated | stacked the several outer layer with an extruder is produced first. And this film is affixed on the predetermined location of the area | region 10 of a tread rubber. Thereby, the predetermined location of the area | region 10 of a tread rubber is covered with a some outer layer.

<Outer layer removal step 1>
This step is a step of removing at least a part of the outer layer, in the example shown in FIG. 1, by laser processing (FIGS. 1B to 1C).

  In this step, a laser beam machine is used to directly irradiate the outer layer 30 with laser light to remove a part of the outer layer 30 and partially expose the tread rubber region 10.

  The area where the outer layer 30 is not removed and the area where the outer layer 30 is removed and the tread rubber is exposed are determined by transmitting information pre-computerized by a predetermined program to the laser processing machine. Next, according to this information, for example, by using a carbon dioxide laser, a predetermined region of the outer layer 30 is removed, so that two types of layers (tread rubber and outer layer 30) as shown in FIG. An exposed tread surface can be obtained.

  Although not shown, in the case where the outer layer is composed of the above film, that is, a plurality of layers, the depth at which the outer layer is removed is determined for each region of the film. Then, based on this determination, the depth is appropriately changed for each specific region, and the outer layer is removed. As a result, a tread surface in which three or more types of layers (tread rubber and a plurality of outer layers) are exposed can be obtained. The depth at which the film is removed can be adjusted by the laser intensity (mainly proportional to the irradiation time).

<Vulcanization process>
In this step, a green tire is molded using a tread rubber (FIG. 1 (c)) in which the outer layer 30 is formed in a stripe shape, and then the green tire is vulcanized using a predetermined mold. This is a process of forming a pattern (FIGS. 1C to 1D). In this step, normal vulcanization is performed. Thereby, the groove | channel G as shown in FIG.1 (d) is formed in the tread surface.

(Manufacturing method of basic form 2)
The basic form 2 is a form in which buffing is used for patterning the tread surface of the tire material (tread rubber). The manufacturing method of the pneumatic tire according to the present embodiment is also the same as the basic mode 1 in the normal manufacturing processes, that is, the tire material mixing process, the tire material processing process, the green tire molding process, and the vulcanization process. And an inspection process after vulcanization. The method for manufacturing a pneumatic tire according to the present embodiment includes an outer layer forming step similar to that of the basic embodiment 1 between the tire material processing step and the green tire molding step, and also includes a vulcanization step and an inspection step. And a step of removing a part of the outer layer by buffing (hereinafter sometimes referred to as “outer layer removing step 2”). Of these, the outer layer forming step is the same as that of the basic mode 1, and therefore, the outer layer removing step 2 and the like specific to the present embodiment will be described in detail below.

  FIG. 2 is a perspective view showing the state of the tread surface of the tire material (tread rubber) in each manufacturing process of the manufacturing method of the pneumatic tire according to the present embodiment. In the figure, (a) is a processing state of a tire material, (b) is a state in which an outer layer is formed, (c) is a state after vulcanization, and (d) is a state in which buffing is performed. It is. In the present embodiment, the outer layer removal step 2 is performed by buffing after the vulcanization step.

<Vulcanization process>
This step forms a tread pattern by molding a green tire using the tread rubber (FIG. 2B) on which the outer layer 30 is formed, and then vulcanizing the green tire using a predetermined mold. (FIG. 2 (b) to (c)). In this step, normal vulcanization is performed. Thereby, the groove | channel G as shown in FIG.2 (c) is formed in the tread surface.

<Outer layer removal step 2>
This step is a step of removing at least a part of the outer layer, in the example shown in FIG. 2, by buffing (FIGS. 2C to 2D).

  In this step, in the state where the groove G is formed in the tread rubber region 10 by vulcanization, the outer layer 30 is buffed to remove a part thereof, and the tread rubber region 10 is partially exposed (FIG. 2 (d)).

  After determining the region where the outer layer 30 is not removed and the region where the outer layer 30 is removed to expose the tread rubber, for example, a predetermined region of the outer layer 30 is manually removed by using a predetermined abrasive. Similar to 1, a tread surface in which two types of layers (tread rubber and outer layer 30) are exposed can be obtained.

  Although not shown, in the case where the outer layer is composed of the above film, that is, a plurality of layers, the depth at which the outer layer is removed is determined for each region of the film. Then, based on this determination, the depth is appropriately changed for each specific region, and the outer layer is removed. As a result, a tread surface in which three or more types of layers (tread rubber and a plurality of outer layers) are exposed can be obtained. The depth at which the film is removed can be adjusted by the surface roughness of the buff and the contact speed between the film and the buff.

(Operation by Manufacturing Method of Basic Forms 1 and 2)
As described above, in the groove G, a stripe pattern in which two layers (tread rubber and outer layer 30) are arranged in the substantially longitudinal direction of the groove G as shown in FIGS. 1 (d) and 2 (d), It is formed. In a pneumatic tire having such a stripe pattern on the tread surface, when water flows into the groove G during rolling of the tire, the direction of the boundary line of the stripe pattern (examples shown in FIGS. 1 (d) and 2 (d)) Then, a small vortex flow (not shown) whose traveling direction is a direction substantially perpendicular to the longitudinal direction of the groove G is generated along each boundary line. For this reason, the force which discharges water out of the groove | channel G by this small eddy current generate | occur | produces, and it can improve hydroplaning performance.

  Moreover, in the example shown in FIG.1 (d) and FIG.2 (d), as above-mentioned, the stripe pattern in which two layers are arranged in the substantially longitudinal direction of the groove | channel G is formed, This pattern is not shown in figure, If the extending direction of the boundary line of the stripe pattern is appropriately changed, the pattern can be a complex type or various types, and thus various types.

  As described above, in the pneumatic tire obtained by the manufacturing method of the present embodiment (basic forms 1 and 2), various patterns formed by the boundary lines between the rubbers appearing in the groove are improved in improving the hydroplaning performance. Various types can be used, and as a result, a variety of rectifying actions can be provided based on these patterns.

[Additional form]
Next, additional modes 1 to 6 that can be optionally implemented with respect to the basic mode of the pneumatic tire according to the present invention will be described.

(Additional form 1)
In the basic form, it is preferable that the thickness of the outer layer (outer layer 30 in FIGS. 1 and 2) be 0.03 [mm] or more and 0.4 [mm] or less (additional form 1). By setting the thickness of the outer layer to 0.03 [mm] or more, the outer layer can be easily handled in the outer layer forming step. Further, by setting the thickness of the outer layer to 0.4 [mm] or less, particularly when the outer layer removing step is performed by laser processing (outer layer removing step 1), the outer layer is positioned on the inner side in the tire radial direction from the outer layer to be removed. In the outer layer removing step 1, it is possible to suppress the occurrence of defects on the surface of the tread without burning the layer (tread rubber shown in FIG. 1).

(Additional form 2)
In the basic form and the form obtained by adding the additional form 1 to the basic form, the extending direction of the thermoplastic elastomer composition is made parallel to the longitudinal direction of the groove by the laser processing or buffing (additional form). 2) is preferred.

  FIG. 3 is a perspective view showing an example of a surface state of a groove obtained by the method for manufacturing a pneumatic tire according to the present embodiment. In the example shown in the figure, two layers (tread rubber and outer layer 50) are arranged in the width direction of the groove G in the groove G of the tread obtained through the outer layer forming step and the outer layer removing step 1 (or outer layer removing step 2). And a stripe pattern arranged in the depth direction is formed.

  In this example, when water flows into the groove G during rolling of the tire, a small eddy current (in the example shown in FIG. 3, the same direction as the longitudinal direction of the groove G) in the direction of the boundary line of the stripe pattern ( (Not shown) occurs along each boundary line. Then, the plurality of vortex flows as a whole becomes a large vortex flow (not shown) whose traveling direction is the longitudinal direction of the groove G, and the anti-hydroplaning performance can be improved.

(Additional form 3)
In the basic form and the form in which the additional form 1 is added to the basic form, the thermoplastic elastomer composition is applied to the longitudinal direction of the groove by 10 [°] or more and 60 [°] by the laser processing or buffing. In the following, it is preferable that the thermoplastic elastomer composition is extended in an inclined direction, and the thermoplastic elastomer composition is extended from the bottom surface of the groove so as to straddle both wall surfaces (additional form 3).

  FIG. 4 is a perspective view illustrating an example of a surface state of a groove obtained by the method for manufacturing a pneumatic tire according to the present embodiment. In the example shown in the figure, two layers (tread rubber and outer layer 52) are arranged in the width direction of the groove G in the groove G of the tread obtained through the outer layer forming step and the outer layer removing step 1 (or the outer layer removing step 2). And the stripe pattern which inclines and extends with respect to the depth direction is formed.

  In this example, when water flows into the groove G during rolling of the tire, the direction of the boundary line of the stripe pattern (in the example shown in FIG. 4, the angle between the longitudinal direction of the groove G and 10 [°] or more and 60 [°] or less. A small vortex flow (not shown) having a traveling direction in the traveling direction is generated along each boundary line. Then, the plurality of vortex flows as a whole becomes a large vortex flow (not shown) whose traveling direction is the longitudinal direction of the groove G, and the anti-hydroplaning performance can be improved.

  In the example shown in FIG. 4, the outer layer 52 is inclined at an angle of 10 ° or more with respect to the longitudinal direction of the groove G, thereby greatly ensuring the effect of discharging water out of the groove G. In addition, the anti-hydroplaning performance can be improved. Further, by inclining the outer layer 52 at an angle of 60 [°] or less with respect to the longitudinal direction of the groove, a plurality of small vortex flows generated along each boundary line as a whole have the longitudinal direction of the groove G as the traveling direction. As a result, the hydroplaning performance can be improved.

(Additional form 4)
In the basic form and the form in which the additional form 1 is added to the basic form, the thermoplastic elastomer composition is changed from the group consisting of dimples, zigzags and undulations, and combinations thereof by the laser processing or buffing. It is preferred to have at least one selected shape (additional form 4).

  FIG. 5 is a perspective view showing a plurality of examples of the surface state of the grooves obtained by the method for manufacturing a pneumatic tire according to the present embodiment. In the figure, (a) is an example in which the outer layer is a dimple shape, (b) is an outer layer in a zigzag shape, (c) is an outer layer in a wavy shape, and (d) is an example in which the outer layer is a combined shape of a dimple shape and a linear shape. is there. In these examples, a pattern composed of two layers (tread rubber and outer layers (54, 56, 58, 60)) is formed in the groove G of the tread.

  When the dimple-shaped outer layer 54 as shown in FIG. 5A appears in the groove G, for example, turbulent flow into the water that flows into the tire at the intersection of the tire circumferential groove and the tire inclined groove. It is possible to suppress the water entering the grooves from being separated from the groove wall, and the water can be sent into the grooves with less resistance. As a result, the hydroplaning performance can be improved at the intersections between the grooves.

  When the zigzag outer layer 56 as shown in FIG. 5 (b) and / or the wavy outer layer 58 as shown in FIG. 5 (c) appear in the groove G, not only the anti-hydroplaning performance. In particular, the appearance, that is, the design of the groove surface can be enhanced.

  The shape of the outer layer that appears in the groove G is not limited to the dimple shape, zigzag shape, and wave shape shown in FIGS. 5A to 5C, and may be a combination thereof. For example, a combination shape 60 of a dimple shape and a linear shape as shown in FIG. According to these combination shapes, the above-described effects of the shapes constituting the combination can be partially obtained.

(Additional form 5)
In the basic form and the form obtained by adding at least one of the additional forms 1 to 4 to the basic form, it is preferable to add a colorant to the thermoplastic elastomer composition (outer layer) (additional form 5). By mix | blending a coloring agent with an outer layer, an outer layer can be made conspicuous with respect to a tread rubber, and an external appearance can be improved. As the colorant, pigments and dyes that can be blended in general rubber compositions can be used. In addition, when the outer layer is a plurality of layers, it is possible to clearly distinguish the outer layers from each other by blending a colorant only in a specific outer layer, or blending a colorant having a different color for each outer layer. it can.

(Additional form 6)
In the basic form and the form obtained by adding at least one of the additional forms 1 to 5 to the basic form, it is preferable to perform the laser processing before vulcanization (additional form 6). In the basic mode, the outer layer removal step 1 by laser processing is performed between the tire material processing step and the green tire molding step, that is, before vulcanization, and the outer layer removal step 1 is performed after vulcanization. You can also However, after the grooves are formed by vulcanization, it is difficult to perform laser irradiation with high accuracy on the outer layer formed in the grooves. It is preferable to carry out before vulcanization.

  Pneumatic tires manufactured according to the above-described embodiment (a basic form and a form in which at least one of additional forms 1 to 6 including the basic form is optionally added) are all grooves. A pattern consisting of a boundary line between two or more kinds of rubbers (tread rubber and at least one kind of outer layer) appearing in G can be made into a wide variety of types, and in order to improve wet performance, Based on the pattern, a variety of rectifying effects can be provided.

  The tire size is 195 / 65R15 91H, conditions in Table 1 (whether or not the outer layer is formed after processing the tire material (tread rubber) (whether or not the outer layer is formed), and a part of the outer layer formed on the tread rubber is laser. The tires of the conventional example, the comparative example, and the examples 1 to 3 according to whether they were removed by processing (whether or not the outer layer was removed by laser processing) and the shape of the outer layer that appeared in the obtained groove), respectively. Produced.

  In the conventional example, vulcanization was performed without forming an outer layer after processing the tread rubber. In the tires of the comparative example and Examples 1 to 3, all the circumferential grooves were formed with one layer made of a thermoplastic elastomer composition containing a mixture of a thermoplastic resin and an elastomer as an outer layer. . About the comparative example, the outer layer was formed in the whole surface of the predetermined location of the tread rubber used as a groove | channel after vulcanization. Further, the shape of the outer layer is a linear shape shown in FIG. 3 in the first embodiment, a linear shape shown in FIG. 4 (θ = 35 ° in FIG. 4) in the second embodiment, and in FIG. The dimple shape shown in FIG. In addition, about each Example shown above and a comparative example, the pneumatic tire was produced by the aspect of said basic form 1.

  Each test tire manufactured in this way is assembled on a 15x6J rim at an air pressure of 230 kPa, mounted on a sedan type vehicle with a displacement of 2000 CC, enters a pool with a depth of 10 mm at different speeds, and hydroplaning generation speed by the test driver Was measured. And based on this measurement result, the index evaluation which made the conventional example the standard (100) was performed. This evaluation indicates that the higher the index, the higher the hydroplaning performance. The results are also shown in Table 1.

  According to Table 1, the pneumatics of Examples 1 to 3 obtained by the manufacturing method belonging to the technical scope of the present invention (forming a predetermined outer layer and removing a part of the outer layer by laser processing) It can be seen that the tires have higher hydroplaning performance than the conventional and comparative pneumatic tires that do not belong to the technical scope of the present invention. In the pneumatic tires obtained by the manufacturing methods of Examples 1 to 3, the pattern appearing in the groove is a stripe shape or a dimple shape in which two layers are arranged in a predetermined direction. This is because the outer layer has a complicated pattern compared to the comparative example in which the outer layer appears on the entire surface of the groove.

  In addition, according to the pneumatic tires of Examples 1 to 3, when improving the wet performance, a pattern composed of a plurality of boundary lines appearing in the groove can be made into various types, and variations based on these patterns are possible. It was also demonstrated that a rich rectifying action was brought about.

  The present invention includes the following aspects.

  (1) A step of forming at least one outer layer made of a thermoplastic elastomer composition containing a mixture of a thermoplastic resin and an elastomer on the surface of the tread groove, and at least part of the outer layer is subjected to laser processing or buffing. A method of manufacturing a pneumatic tire, including a step of removing by processing.

  (2) The manufacturing method of the pneumatic tire according to (1), wherein the thickness of the outer layer is 0.03 [mm] or more and 0.4 [mm] or less.

  (3) The manufacturing method of the pneumatic tire according to (1) or (2), wherein the extending direction of the thermoplastic elastomer composition is parallel to the longitudinal direction of the groove by the laser processing or buffing.

  (4) The thermoplastic elastomer composition is extended in a direction inclined at 10 [°] or more and 60 [°] or less with respect to the longitudinal direction of the groove by the laser processing or buff processing, and the thermoplastic elastomer. The method for producing a pneumatic tire according to (1) or (2), wherein the composition extends from the bottom surface of the groove so as to straddle both wall surfaces.

  (5) The above-mentioned (1), wherein the thermoplastic elastomer composition is made into at least one shape selected from the group consisting of a dimple shape, a zigzag shape, a wave shape, and a combination thereof by the laser processing or the buff processing. Or the manufacturing method of the pneumatic tire as described in (2).

  (6) The method for producing a pneumatic tire according to any one of (1) to (5), wherein a colorant is blended with the thermoplastic elastomer composition.

  (7) The method for manufacturing a pneumatic tire according to any one of (1) to (6), wherein the laser processing is performed before vulcanization.

  (8) A pneumatic tire obtained by the pneumatic tire manufacturing method according to any one of (1) to (7) above.

10 Region to be a tread surface after vulcanization 30, 50, 52, 54, 56, 58, 60 Outer layer G groove θ Angle formed by outer layer 52 with respect to the longitudinal direction of groove G

Claims (7)

Forming at least one outer layer made of a thermoplastic elastomer composition comprising a mixture of a thermoplastic resin and an elastomer on the surface of the tread groove;
And a step of removing at least a part of the outer layer by laser processing or buffing.   The method for manufacturing a pneumatic tire according to claim 1, wherein the thickness of the outer layer is 0.03 [mm] or more and 0.4 [mm] or less.   The manufacturing method of the pneumatic tire of Claim 1 or 2 which makes the extending direction of a thermoplastic elastomer composition parallel to the longitudinal direction of a groove | channel by the said laser processing or buff processing.   The thermoplastic elastomer composition is extended in a direction inclined at 10 [°] or more and 60 [°] or less with respect to the longitudinal direction of the groove by the laser processing or buff processing, and the thermoplastic elastomer composition is The method for manufacturing a pneumatic tire according to claim 1, wherein the pneumatic tire extends from the bottom surface of the groove so as to straddle both wall surfaces.   3. The thermoplastic elastomer composition according to claim 1, wherein the thermoplastic elastomer composition is formed into at least one shape selected from the group consisting of a dimple shape, a zigzag shape, a wave shape, and a combination thereof by the laser processing or buffing. Method of manufacturing a pneumatic tire.   The manufacturing method of the pneumatic tire of any one of Claim 1 to 5 which mix | blends a coloring agent with the said thermoplastic elastomer composition.   The method for manufacturing a pneumatic tire according to claim 1, wherein the laser processing is performed before vulcanization.

Images