JP4569065B2 - Pneumatic tire and manufacturing method thereof - Google Patents

Pneumatic tire and manufacturing method thereof Download PDF

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Publication number
JP4569065B2
JP4569065B2 JP2002242908A JP2002242908A JP4569065B2 JP 4569065 B2 JP4569065 B2 JP 4569065B2 JP 2002242908 A JP2002242908 A JP 2002242908A JP 2002242908 A JP2002242908 A JP 2002242908A JP 4569065 B2 JP4569065 B2 JP 4569065B2
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Japan
Prior art keywords
cap tread
tire
rubber
antistatic layer
pneumatic tire
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JP2004082766A (en
Inventor
寛 畑
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Yokohama Rubber Co Ltd
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Yokohama Rubber Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/52—Unvulcanised treads, e.g. on used tyres; Retreading
    • B29D2030/526—Unvulcanised treads, e.g. on used tyres; Retreading the tread comprising means for discharging the electrostatic charge, e.g. conductive elements or portions having conductivity higher than the tread rubber

Description

【０００１】
【発明の属する技術分野】
本発明は、シリカ配合ゴムを少なくともキャップトレッド表面に有する空気入りタイヤおよびその製造方法に関し、さらに詳しくは、キャップトレッドを導電性ゴムからなる帯電防止層とともに押し出ししても、成形性の悪化を抑制して容易に製造することができる空気入りタイヤおよびその製造方法に関する。
【０００２】
【従来の技術】
近年、タイヤの転動抵抗の低減やグリップ力の向上を目的として、トレッドゴムの補強充填剤としてカーボンブラックの替わりにシリカを添加することが提案されている。しかし、トレッドゴムに導電性のカーボンブラックに替えて非導電性のシリカを配合すると、トレッド部の電気抵抗が大きくなるため、車両に帯電した電荷をタイヤを通じて路面にリークすることができなくなってしまう。このようにして車両に帯電した電荷は、電子回路部品の機能やラジオの受信感度に悪影響を及ぼすという問題があった。
【０００３】
このような問題の対策として、特開平９−７１１１２号公報では、図４に示すようにキャップトレッド２中央部に帯電防止層１（導電層）をタイヤ一周にわたってトレッドの下層ゴムまで貫通するように配置したタイヤが提案されている。しかし、図４のように、キャップトレッド２に帯電防止層１を挟み込んだ状態でトレッドゴムを押し出すと、各ゴムの収縮性が異なるために、押し出し後にゴムが収縮した際にキャップトレッド全体の形状が変形してしまい、押し出し成形性が悪化しキャップトレッド２の形状の手直し等の加工が必要となり、生産性が低下するという問題があった。
【０００４】
【発明が解決しようとする課題】
従って、本発明の課題は、キャップトレッドを導電性ゴムからなる帯電防止層とともに押し出ししても、成形性の悪化を抑制して容易に製造することができる空気入りタイヤおよびその製造方法を提供することにある。
【０００５】
【課題を解決するための手段】
本発明によれば、シリカ配合ゴムを少なくともキャップトレッド表面に有する空気入りタイヤにおいて、該キャップトレッドが、前記シリカ配合ゴムを中央にし、その端部に導電性ゴムからなる帯状の帯電防止層を並列配置して共に押し出した構造の押出物を、前記帯状の帯電防止層をその帯状の長さ方向がタイヤ周方向に対して傾斜するように角度をなして配置した構造である空気入りタイヤが提供される。
【０００６】
また、本発明によれば、前記帯電防止層のタイヤ周方向に対する角度が１０°以下である前記空気入りタイヤが提供される。
【０００７】
また、本発明によれば、シリカ配合ゴムを少なくともキャップトレッド表面に有し、前記キャップトレッド表面に導電性ゴムからなる帯電防止層をタイヤ周方向に対して傾斜するように角度をなして配置した空気入りタイヤの製造方法であって、キャップトレッドをその端部に前記帯電防止層を配置して押し出し、このキャップトレッドを押し出し方向に対し１０°以下の角度で切断し、次いでキャップトレッドを切断方向がタイヤ周方向となるようにタイヤに巻き付けて成形する空気入りタイヤの製造方法が提供される。
【０００８】
【発明の実施の形態】
以下、本発明の構成について図面を参照しながら詳細に説明する。図１は、本発明の空気入りタイヤの一例の概略を示す斜視図である。空気入りタイヤの少なくともキャップトレッド２表面には、シリカ配合ゴムが配設されている。このキャップトレッド２表面に導電性ゴムからなる帯電防止層１が、タイヤ周方向に対して傾斜するような角度をなすように配置されている。帯電防止層１は、キャップトレッド２表面からキャップトレッド２の下層ゴムまで貫通するように配置され、車両に帯電した電荷を路面にリークできるように構成されている。
【０００９】
帯電防止層１のタイヤ周方向に対する角度は、０°超１０°以下とするのが好ましい。この角度を１０°以下とすることで、帯電防止層１がタイヤ周方向にわたって広い領域に配置され、電荷の路面への放電を効率よく行うことができ好ましい。図１においては、帯電防止層１がほぼタイヤ半周にわたって配置されている。また、帯電防止層１は、キャップトレッド２表面のタイヤ全幅にわたるように配置されるのが、電荷の路面への放電効果を上げるために好ましい。
【００１０】
この空気入りタイヤの製造は、まず、図２の（ａ）に示されるように、中央にシリカ配合ゴム３が、両端部に帯電防止層１を形成する導電性ゴム４が配置されるように、キャップトレッド用ゴム組成物を押し出し、押出物５が得られる。次に、図３の上面図に示されるように、上記の押出物５を矢印に示される押し出し方向に対して、角度αをなすように破線Ｓ−Ｓにそって切断する。切断した押出物５は、切断方向すなわちＳ−Ｓ方向がタイヤ周方向と一致するようにタイヤに巻き付けて成形する。すると、両端部に押し出された導電性ゴム４同士が合わさり、図１に示すようなタイヤ周方向に対して傾斜して配置される帯電防止層１が形成される。なお、押出物５の切断は、切断面が傾斜する形状となるので、押し切りで行うのが好ましい。
【００１１】
本発明の空気入りタイヤおよびその製造方法は、以上のような工程で製造でき、シリカ配合ゴム３の端部に帯電防止層１を配置して押し出すので、上述した従来の技術に見られるような押出物（キャップトレッド）の変形が防止でき、得られた押出物を斜めに切断してタイヤに配設すればよい。よって、本発明の空気入りタイヤおよびその製造方法によれば、成形性の悪化を抑制してタイヤを容易に製造することができる。
【００１２】
なお、押出物５は、図２の（ｂ）のように両端部の側面が傾斜した形状（図では右方に傾斜）とし、切断後にタイヤに配置する際に、端部同士をスプライスしやすいようにしてもよい。また、導電性ゴム４は、シリカ配合ゴム３の両端部に配置せず片側のみに配置しても、本発明の空気入りタイヤを製造することができる。また、切断した押出物５は、サイズによっては、２枚以上を連ねてタイヤに配置してもよい。
【００１３】
本発明のシリカ配合ゴム３は、ゴムにシリカを配合させたものであれば使用可能であるが、特にシリカを多量配合させ、ゴムの電気抵抗が１０7Ω・ｃｍ以上、さらには、１０7〜１０10Ω・ｃｍとなるようにしたものが好ましい。
【００１４】
また、導電性ゴム４としては、例えば、カーボンブラック等の導電性補強充填剤を配合した、電気抵抗１０6Ω・ｃｍ以下、さらには、１０2〜１０6Ω・ｃｍであるものが好ましい。
【００１５】
【実施例】
以下、実施例によって本発明をさらに説明するが、本発明の範囲をこれらの実施例に限定するものではない。
実施例１〜２、従来例及び比較例１
電気抵抗１０10Ω・ｃｍのシリカ配合ゴム３と電気抵抗１０6Ω・ｃｍの導電性ゴム４を押し出し、図２（ａ）に示すような押出物５を作製した。導電性ゴム４の幅は各１ｍｍであった。これを図３のように角度αで破線Ｓ−Ｓにそって切断し、切断方向がタイヤ周方向と一致するようにタイヤに巻き付けて図１のように成形した。これを常法にて加硫し、幅２ｍｍの帯電防止層１をキャップトレッド２表面に有する、タイヤサイズ２０５／５５Ｒ１６の実施例１〜２の乗用車用空気入りタイヤを得た。なお、帯電防止層１のタイヤ周方向に対する角度（切断角度αに一致）は、下記表１に示した。また、実施例２は、切断した押出物を２枚連ねて巻き付けた。
【００１６】
また、従来例として、図４のように、実施例と同一のシリカ配合ゴム３と導電性ゴム４を用いて、シリカ配合ゴム３の中央部に幅２ｍｍの導電性ゴム４を配置したキャップトレッド２を押し出し成形し、これをタイヤに巻き付けて上記と同様のサイズのタイヤを得た。また、比較例１として、実施例と同一のシリカ配合ゴム３を用い、導電性ゴム４を配置しないキャップトレッド２を用いて、上記と同様にタイヤを作製した。
【００１７】
得られた各タイヤについて、以下のように押し出し加工性を観察し、タイヤの電気抵抗を測定した。
押し出し加工性
押出物あるいはキャップトレッドの押し出し工程を観察し、押出物やキャップトレッドが変形もなく作製できたものを○、押出物やキャップトレッドに変形が見られ手直しが必要であったものを×とした。
タイヤ電気抵抗
ＪＡＴＭＡ発行の「タイヤの電気抵抗値測定方法」（１９９８年）に基づき測定した。
【００１８】
【表１】

Figure 0004569065
【００１９】
表１に示すように、中央部に導電性ゴムを配置してキャップトレッドを押し出す従来例は、キャップトレッドが変形してしまい押出加工性が悪い。それに対して、実施例１〜２の本発明の空気入りタイヤおよびその製造方法は、押出物の変形が抑えられ押出加工性が改善されながらも、比較例１に比較してタイヤの導電性が改善されるという良好な結果が得られた。
【００２０】
【発明の効果】
本発明に従って、シリカ配合ゴムのキャップトレッド表面に導電性ゴムからなる帯電防止層をタイヤ周方向に対して傾斜するように角度をなして配置することによって、キャップトレッドを導電性ゴムからなる帯電防止層とともに押し出ししても、成形性の悪化を抑制して容易に製造することができる空気入りタイヤおよびその製造方法を得ることができる。
【図面の簡単な説明】
【図１】本発明の空気入りタイヤの斜視図である。
【図２】キャップトレッドとシリカ配合ゴムとからなる押出物である。
【図３】押出物を切断してキャップトレッドを作製する状態を示す上面図である。
【図４】従来のキャップトレッドの斜視図である。
【符号の説明】
１ 帯電防止層
２ キャップトレッド
３ シリカ配合ゴム
４ 導電性ゴム
５ 押出物[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pneumatic tire having at least a silica-containing rubber on the surface of a cap tread and a manufacturing method thereof. More specifically, even if the cap tread is extruded together with an antistatic layer made of a conductive rubber, the deterioration of moldability is suppressed. It is related with the pneumatic tire which can be manufactured easily, and its manufacturing method.
[0002]
[Prior art]
In recent years, it has been proposed to add silica instead of carbon black as a reinforcing filler for tread rubber for the purpose of reducing rolling resistance of the tire and improving gripping force. However, if non-conductive silica is added to the tread rubber instead of the conductive carbon black, the electric resistance of the tread portion increases, so that the electric charge charged to the vehicle cannot be leaked to the road surface through the tire. . Thus, there has been a problem that the electric charge charged in the vehicle has an adverse effect on the function of the electronic circuit component and the radio reception sensitivity.
[0003]
As a countermeasure against such a problem, in Japanese Patent Application Laid-Open No. 9-71112, as shown in FIG. 4, the antistatic layer 1 (conductive layer) is penetrated through the tire to the lower layer rubber of the tread at the center of the cap tread 2 as shown in FIG. Arranged tires have been proposed. However, as shown in FIG. 4, when the tread rubber is extruded with the antistatic layer 1 sandwiched between the cap tread 2, the shrinkability of each rubber is different, so the shape of the entire cap tread when the rubber shrinks after extrusion. As a result, the extrusion moldability deteriorates, and processing such as reworking the shape of the cap tread 2 is required, resulting in a decrease in productivity.
[0004]
[Problems to be solved by the invention]
Therefore, an object of the present invention is to provide a pneumatic tire that can be easily manufactured while suppressing deterioration of moldability even when a cap tread is extruded together with an antistatic layer made of conductive rubber, and a method for manufacturing the same. There is.
[0005]
[Means for Solving the Problems]
According to the present invention, in a pneumatic tire having at least a silica-blended rubber on the surface of the cap tread, the cap tread has the silica-blended rubber at the center and a strip-shaped antistatic layer made of a conductive rubber at the end thereof in parallel. Provided is a pneumatic tire having a structure in which an extrudate having a structure in which the belt-shaped antistatic layer is arranged and extruded together is arranged at an angle so that the belt-shaped antistatic layer is inclined with respect to the tire circumferential direction. Is done.
[0006]
Moreover, according to this invention, the said pneumatic tire whose angle with respect to the tire circumferential direction of the said antistatic layer is 10 degrees or less is provided.
[0007]
Further, according to the present invention, the silica compounded rubber is provided at least on the surface of the cap tread, and the antistatic layer made of conductive rubber is disposed on the surface of the cap tread so as to be inclined with respect to the tire circumferential direction. A method of manufacturing a pneumatic tire, wherein a cap tread is extruded with the antistatic layer disposed at an end thereof, the cap tread is cut at an angle of 10 ° or less with respect to the pushing direction, and then the cap tread is cut in a cutting direction. There is provided a method for manufacturing a pneumatic tire that is wound around a tire so as to be in the tire circumferential direction.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the configuration of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an outline of an example of the pneumatic tire of the present invention. Silica-containing rubber is disposed on at least the surface of the cap tread 2 of the pneumatic tire. The antistatic layer 1 made of conductive rubber is disposed on the surface of the cap tread 2 so as to be inclined with respect to the tire circumferential direction. The antistatic layer 1 is disposed so as to penetrate from the surface of the cap tread 2 to the lower layer rubber of the cap tread 2, and is configured to be able to leak electric charges charged to the vehicle to the road surface.
[0009]
The angle of the antistatic layer 1 with respect to the tire circumferential direction is preferably more than 0 ° and not more than 10 °. By setting this angle to 10 ° or less, it is preferable that the antistatic layer 1 is disposed in a wide region in the tire circumferential direction and discharge of electric charges to the road surface can be efficiently performed. In FIG. 1, the antistatic layer 1 is disposed substantially over the tire circumference. Further, it is preferable that the antistatic layer 1 is disposed so as to cover the entire width of the tire on the surface of the cap tread 2 in order to increase the discharge effect of charges on the road surface.
[0010]
In the production of this pneumatic tire, first, as shown in FIG. 2A, the silica-containing rubber 3 is arranged at the center and the conductive rubber 4 forming the antistatic layer 1 is arranged at both ends. The rubber composition for cap treads is extruded to obtain an extrudate 5. Next, as shown in the top view of FIG. 3, the extrudate 5 is cut along the broken line SS so as to form an angle α with respect to the extrusion direction indicated by the arrow. The cut extrudate 5 is formed by being wound around a tire so that the cutting direction, that is, the SS direction coincides with the tire circumferential direction. As a result, the conductive rubbers 4 extruded at both ends are joined together, and the antistatic layer 1 is formed so as to be inclined with respect to the tire circumferential direction as shown in FIG. Incidentally, the cutting of the extrudate 5, since the cut surface becomes a shape inclined, it has preferably carried out in the press-cutting.
[0011]
The pneumatic tire and the manufacturing method thereof according to the present invention can be manufactured by the above-described process, and the antistatic layer 1 is disposed and extruded at the end of the silica-containing rubber 3, so that it can be seen in the above-described conventional technology. Deformation of the extrudate (cap tread) can be prevented, and the obtained extrudate may be cut obliquely and disposed on the tire. Therefore, according to the pneumatic tire and the manufacturing method thereof of the present invention, the tire can be easily manufactured while suppressing the deterioration of the moldability.
[0012]
The extrudate 5 has a shape in which the side surfaces of both end portions are inclined as shown in FIG. 2 (b) (inclined to the right in the figure), and when placed on a tire after cutting, the end portions are easily spliced together. You may do it. Moreover, even if the conductive rubber 4 is not disposed on both ends of the silica compounded rubber 3 but only on one side, the pneumatic tire of the present invention can be manufactured. Moreover, the cut extrudate 5 may be arranged on a tire by connecting two or more pieces depending on the size.
[0013]
The silica-blended rubber 3 of the present invention can be used as long as silica is blended with rubber. Particularly, a large amount of silica is blended, and the electric resistance of the rubber is 10 7 Ω · cm or more, and further 10 7 What was made to become 10 < 10 > (omega | ohm) * cm is preferable.
[0014]
Further, as the conductive rubber 4, for example, a material having an electric resistance of 10 6 Ω · cm or less, more preferably 10 2 to 10 6 Ω · cm, containing a conductive reinforcing filler such as carbon black is preferable.
[0015]
【Example】
EXAMPLES Hereinafter, although an Example demonstrates this invention further, the scope of the present invention is not limited to these Examples.
Examples 1-2, conventional example and comparative example 1
Extruding the conductive rubber 4 of the electrical resistance 10 10 Ω · cm silica compounded rubber 3 and the electrical resistance 10 6 Ω · cm, were produced extrudate 5 as shown in FIG. 2 (a). The width of the conductive rubber 4 was 1 mm each. This was cut along the broken line SS at an angle α as shown in FIG. 3, wound around the tire so that the cutting direction coincided with the tire circumferential direction, and formed as shown in FIG. This was vulcanized by a conventional method to obtain pneumatic tires for passenger cars of Examples 1-2 of tire size 205 / 55R16 having the antistatic layer 1 having a width of 2 mm on the surface of the cap tread 2. The angle of the antistatic layer 1 with respect to the tire circumferential direction (corresponding to the cutting angle α) is shown in Table 1 below. In Example 2, two cut extrudates were connected and wound.
[0016]
Further, as a conventional example, as shown in FIG. 4, a cap tread in which a conductive rubber 4 having a width of 2 mm is disposed at the center of the silica-containing rubber 3 using the same silica-containing rubber 3 and conductive rubber 4 as in the embodiment. 2 was extruded and wrapped around a tire to obtain a tire of the same size as above. Further, as Comparative Example 1, a tire was manufactured in the same manner as described above, using the same silica compound rubber 3 as in the example and using the cap tread 2 in which the conductive rubber 4 was not disposed.
[0017]
About each obtained tire, extrusion processability was observed as follows and the electrical resistance of the tire was measured.
Extrudability <br/> Observe the extrusion process of the extrudate or cap tread. If the extrudate or cap tread was made without deformation, the extrudate or cap tread was deformed and needed to be reworked. Was marked with x.
Tire electrical resistance Measured based on “Measurement method of electrical resistance value of tire” (1998) published by JATMA.
[0018]
[Table 1]
Figure 0004569065
[0019]
As shown in Table 1, in the conventional example in which conductive rubber is disposed in the center and the cap tread is pushed out, the cap tread is deformed and the extrudability is poor. On the other hand, the pneumatic tires of the present invention of Examples 1 and 2 and the method for manufacturing the pneumatic tires have improved tire conductivity as compared with Comparative Example 1 while suppressing the deformation of the extrudate and improving the extrusion processability. Good results were obtained that improved.
[0020]
【The invention's effect】
In accordance with the present invention, the antistatic layer made of conductive rubber is disposed on the surface of the cap tread of the silica-blended rubber at an angle so as to be inclined with respect to the tire circumferential direction, so that the cap tread is made of conductive rubber. Even if it extrudes with a layer, the pneumatic tire which can suppress a deterioration of a moldability and can be manufactured easily, and its manufacturing method can be obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view of a pneumatic tire according to the present invention.
FIG. 2 is an extrudate composed of a cap tread and silica compounded rubber.
FIG. 3 is a top view showing a state in which an extrudate is cut to produce a cap tread.
FIG. 4 is a perspective view of a conventional cap tread.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Antistatic layer 2 Cap tread 3 Silica compound rubber 4 Conductive rubber 5 Extrudate

Claims (3)

シリカ配合ゴムを少なくともキャップトレッド表面に有する空気入りタイヤにおいて、該キャップトレッドが、前記シリカ配合ゴムを中央にし、その端部に導電性ゴムからなる帯状の帯電防止層を並列配置して共に押し出した構造の押出物を、前記帯状の帯電防止層をその帯状の長さ方向がタイヤ周方向に対して傾斜するように角度をなして配置した構造である空気入りタイヤ。In the pneumatic tire having at least the surface of the cap tread having the silica compounded rubber, the cap tread is extruded together with the silica compounded rubber at the center and a strip-shaped antistatic layer made of conductive rubber arranged in parallel at the end. A pneumatic tire having a structure in which an extrudate having a structure is arranged such that the belt-shaped antistatic layer is arranged at an angle such that the belt-shaped length direction is inclined with respect to the tire circumferential direction. 前記帯電防止層のタイヤ周方向に対する角度が１０°以下である請求項１に記載の空気入りタイヤ。  The pneumatic tire according to claim 1, wherein an angle of the antistatic layer with respect to a tire circumferential direction is 10 ° or less. シリカ配合ゴムを少なくともキャップトレッド表面に有し、前記キャップトレッド表面に導電性ゴムからなる帯電防止層をタイヤ周方向に対して傾斜するように角度をなして配置した空気入りタイヤの製造方法であって、キャップトレッドをその端部に前記帯電防止層を配置して押し出し、このキャップトレッドを押し出し方向に対し１０°以下の角度で切断し、次いでキャップトレッドを切断方向がタイヤ周方向となるようにタイヤに巻き付けて成形する空気入りタイヤの製造方法。  A method for producing a pneumatic tire comprising silica-containing rubber at least on a cap tread surface, and an antistatic layer made of conductive rubber disposed on the cap tread surface at an angle so as to be inclined with respect to a tire circumferential direction. Then, the cap tread is extruded with the antistatic layer disposed at the end thereof, and the cap tread is cut at an angle of 10 ° or less with respect to the pushing direction, and then the cutting direction of the cap tread is the tire circumferential direction. A method of manufacturing a pneumatic tire that is wound around a tire and molded.
JP2002242908A 2002-08-23 2002-08-23 Pneumatic tire and manufacturing method thereof Expired - Fee Related JP4569065B2 (en)

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JP6329434B2 (en) * 2014-05-20 2018-05-23 住友ゴム工業株式会社 Pneumatic tire
DE102014221394A1 (en) * 2014-10-21 2016-04-21 Continental Reifen Deutschland Gmbh Method for producing a pneumatic vehicle tire and pneumatic vehicle tires
EP3478485B1 (en) * 2016-06-30 2020-09-02 Artic Investments S.A. Method for making a tire

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10309909A (en) * 1997-05-12 1998-11-24 Bridgestone Corp Antistatic tire

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10309909A (en) * 1997-05-12 1998-11-24 Bridgestone Corp Antistatic tire

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