JPH10266083A - Rubber/metal cord composite - Google Patents

Rubber/metal cord composite

Info

Publication number
JPH10266083A
JPH10266083A JP9076003A JP7600397A JPH10266083A JP H10266083 A JPH10266083 A JP H10266083A JP 9076003 A JP9076003 A JP 9076003A JP 7600397 A JP7600397 A JP 7600397A JP H10266083 A JPH10266083 A JP H10266083A
Authority
JP
Japan
Prior art keywords
cord
rubber
circumscribed circle
reduced
portions
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP9076003A
Other languages
Japanese (ja)
Inventor
Masahiro Kurosawa
雅博 黒沢
Toru Horikawa
通 堀川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yokohama Rubber Co Ltd
Original Assignee
Yokohama Rubber Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yokohama Rubber Co Ltd filed Critical Yokohama Rubber Co Ltd
Priority to JP9076003A priority Critical patent/JPH10266083A/en
Publication of JPH10266083A publication Critical patent/JPH10266083A/en
Pending legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0606—Reinforcing cords for rubber or plastic articles
    • D07B1/062—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2016—Strands characterised by their cross-sectional shape
    • D07B2201/2018—Strands characterised by their cross-sectional shape oval
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2021—Strands characterised by their longitudinal shape
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2022—Strands coreless

Landscapes

  • Ropes Or Cables (AREA)
  • Tires In General (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a rubber/metal cord composite comprising a 1×3 structure steel cord ensured in the stability of twist shape and improved in rubber permeability. SOLUTION: This rubber/metal composite is produced by embedding a 1×3 structure steel cord 1 comprising three twisted element wires 2 in a rubber. The steel cord comprises expanded portions A where in the circumscribed circle of each cross section has an approximately flat elliptic shape and wherein the element wires 2 are separated from each other, and reduced portions B wherein the circumscribed circle of each cross section has an approximately circular shape and wherein at least two of the element wires are brought into contact with each other. The expanded portions A and the reduced portions B are alternately arranged in the longitudinal direction. Therein, the minor diameter (a) and the major diameter (b) of the circumscribed circle in the expanded portion A has a (a)/(b) flatness ratio of 0.7-0.9, and the major diameter (b) and the circumscribed circle diameter (d) of the reduced portion B has a (b)/(d) ratio of 1.1-1.45. The length of each reduced portion in the longitudinal direction is one third or large as long as the twist pitch of the cord is concerned, and the distance between the adjacent reduced portions B is two times or larger the twist pitch of the cord.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、スチールコードの
撚りの形状安定性を確保しながらゴム浸透性を良好にす
るゴム／金属コード複合体に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber / metal cord composite for improving the rubber permeability while securing the twist shape stability of a steel cord.

【０００２】[0002]

【従来の技術】ラジアルタイヤのベルト層やコンベヤベ
ルトの補強層などは、スチールコードをゴムに埋設した
ゴム／金属コード複合体から構成されている。このスチ
ールコードとしては、１×４構造又は１×５構造のもの
が広く使用されてきたが、最近、軽量化やコスト削減等
のために１×３構造のものが注目されるようになってい
る。2. Description of the Related Art A belt layer of a radial tire and a reinforcing layer of a conveyor belt are made of a rubber / metal cord composite in which a steel cord is embedded in rubber. As this steel cord, a 1 × 4 structure or a 1 × 5 structure has been widely used, but recently, a 1 × 3 structure has been attracting attention for weight reduction and cost reduction. I have.

【０００３】しかし、一般に、１×３構造を含む１×Ｎ
構造のスチールコードは、Ｎ本の素線を撚り合わせてな
り、素線同士が互いに接触しているために、コード内部
へのゴム浸透性がわるいという欠点がある。このように
ゴム浸透性がわるいスチールコードを用いて例えばラジ
アルタイヤのベルト層を構成した場合には、タイヤ使用
中にトレッド面に受けた外傷から浸入した水分がベルト
層のスチールコード内部に浸入し、そこでコードの腐食
を起こしてコードを破壊に至らしめるため、タイヤの耐
久性を悪化させてしまうという問題があった。However, in general, 1 × N including 1 × 3 structure
The steel cord having the structure has a drawback that N wires are twisted and the wires are in contact with each other, so that rubber penetration into the inside of the cord is poor. In the case of forming a belt layer of a radial tire, for example, using a steel cord having poor rubber permeability in this manner, moisture that has entered from the damage received on the tread surface during use of the tire enters the steel cord of the belt layer. However, there is a problem that the durability of the tire is deteriorated because the corrosion of the cord is caused to destroy the cord.

【０００４】従来、１×Ｎ構造のスチールコードのゴム
浸透性を確保する対策としては、素線相互間が離隔する
ように隙間を形成するように撚り合わせたオープン構造
を採用することが行われていた。しかし、このオープン
構造は、撚りの形状安定性がわるい（素線が均等な位置
関係を保たず、素線同士が片寄った状態になり易い）と
いう問題があった。Conventionally, as a measure for ensuring rubber permeability of a steel cord having a 1 × N structure, an open structure in which wires are twisted so as to form a gap so as to separate the wires from each other is employed. I was However, this open structure has a problem that the twist shape stability is poor (the wires do not maintain a uniform positional relationship and the wires tend to be offset).

【０００５】この問題を避けるために、実公昭58-48392
号公報には、コード長手方向において撚りのあまい部分
と締つた部分とを交互に配列するように構成し、その撚
りのあまい部分の相互間を撚りピッチの１ピッチとして
いるため、撚りの締つた部分が多すぎ、コードの形状安
定性は良好になるもののゴム浸透性が不十分になるとい
う欠点があった。To avoid this problem, Japanese Utility Model Publication No. 58-48392
In the publication, the twisted portions and the tightened portions are arranged alternately in the longitudinal direction of the cord, and the interval between the twisted portions is one pitch of the twist pitch. There were too many parts, and the shape stability of the cord was good, but the rubber permeability was insufficient.

【０００６】[0006]

【発明が解決しようとする課題】本発明の目的は、撚り
の形状安定性を確保しながらゴム浸透性を向上するよう
にした１×３構造のスチールコードからなるゴム／金属
コード複合体を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a rubber / metal cord composite comprising a steel cord having a 1.times.3 structure which is capable of improving the rubber permeability while securing the dimensional stability of the twist. Is to do.

【０００７】[0007]

【課題を解決するための手段】本発明のゴム／金属コー
ド複合体は、３本の素線を撚り合わせた１×３構造のス
チールコードをゴムに埋設した複合体であり、前記スチ
ールコードはコード横断面の外接円が扁平な略楕円形で
前記素線が互いに離隔状態になっている拡大部と、コー
ド横断面の外接円が略円形で前記素線の少なくとも２本
が接触している縮小部とが長手方向に交互に配列した構
成からなり、前記拡大部は前記外接楕円形の短径ａと長
径ｂとの比ａ／ｂで定義される扁平比が０．７〜０．
９、該長径ｂと前記縮小部の外接円直径ｄとの比ｂ／ｄ
が１．１〜１．４５であり、前記縮小部は長手方向の長
さがコード撚りピッチの１／３以下であって、隣接する
縮小部との間隔がコード撚りピッチの２倍以上であるこ
とを特徴とする。The rubber / metal cord composite of the present invention is a composite in which a steel cord having a 1 × 3 structure in which three strands are twisted is embedded in rubber. An enlarged portion in which the circumscribed circle of the cord cross section is flat and substantially elliptical and the wires are separated from each other is in contact with at least two of the strands whose circumscribed circle of the cord cross section is substantially circular. The enlarged portion has a flattened ratio defined by the ratio a / b of the minor axis a to the major axis b of the circumscribed ellipse of 0.7 to 0.1.
9. Ratio b / d between the major diameter b and the circumscribed circle diameter d of the reduced portion
Is 1.1 to 1.45, and the length of the reduced portion in the longitudinal direction is not more than 1/3 of the cord twist pitch, and the interval between adjacent reduced portions is not less than twice the cord twist pitch. It is characterized by the following.

【０００８】このように、拡大部のコード横断面形状を
略楕円形にしたため（扁平化）、ゴム浸透性を確保する
ことが可能となる。また、スチールコードの長手方向に
は拡大部と縮小部とを交互に設けると共に拡大部を扁平
化したため、素線同士が互いに拘束し合うようになるか
らコードが型崩れしなくなるので、撚りの形状安定性を
確保することができる。As described above, since the cross-sectional shape of the cord of the enlarged portion is substantially elliptical (flattened), it is possible to ensure rubber permeability. In addition, in the longitudinal direction of the steel cord, enlarged portions and reduced portions are alternately provided and the enlarged portion is flattened, so that the wires do not collapse because the wires are restrained with each other, so the twisted shape Stability can be ensured.

【０００９】[0009]

【発明の実施の形態】本発明のゴム／金属コード複合体
は、３本の素線を撚り合わせてなる１×３構造のスチー
ルコードをゴムに埋設してなる。このスチールコードで
は、図１に示すように、コード横断面において少なくと
も２本の素線２の相互間が接触した縮小部Ｂと３本の素
線２が相互間を離隔した拡大部Ａとがコード長手方向に
交互に配列している。また、拡大部Ａのコード横断面形
状は、その外接円が略楕円形（すなわち、扁平状）にな
っているが、縮小部Ｂのコード横断面形状は、その外接
円が略円形になっている。BEST MODE FOR CARRYING OUT THE INVENTION The rubber / metal cord composite of the present invention is obtained by embedding a steel cord having a 1 × 3 structure in which three strands are twisted into rubber. In this steel cord, as shown in FIG. 1, a reduced portion B in which at least two wires 2 are in contact with each other and an enlarged portion A in which three wires 2 are separated from each other in the cross section of the cord. The cords are alternately arranged in the longitudinal direction. The cord cross-sectional shape of the enlarged portion A has a substantially circumscribed circle that is substantially elliptical (that is, flat), whereas the cord cross-sectional shape of the reduced portion B has a substantially circular circumscribed circle. I have.

【００１０】拡大部Ａのコード横断面においては、図２
に示すように、その長径ｂと短径ａとの比ａ／ｂで定義
される扁平比が０．７〜０．９になっている。扁平比が
０．７未満では、扁平になりすぎて素線２の塑性変形量
（くせ付けの程度）が大きくなるため、素線２のダメー
ジが大きくなってコードの耐疲労性が低下する。扁平比
が０．９を超えると、扁平化が殆ど解消されてしまうの
で素線同士の互いの拘束がなくなり、コードの型崩れが
生じてしまう。したがって、素線２にダメージを与えず
に素線相互間に拘束性を与えるには、扁平比を０．７〜
０．９にするのがよい。In the cross section of the cord of the enlarged portion A, FIG.
As shown in the figure, the aspect ratio defined by the ratio a / b of the major axis b to the minor axis a is 0.7 to 0.9. If the aspect ratio is less than 0.7, the wire becomes too flat and the amount of plastic deformation (the degree of habit) of the wire 2 increases, so that the damage of the wire 2 increases and the fatigue resistance of the cord decreases. If the aspect ratio exceeds 0.9, the flattening is almost completely eliminated, and the wires are not restrained by each other, and the cords lose their shape. Therefore, in order to give restraint between the wires without damaging the wires 2, the aspect ratio should be 0.7 to 0.7.
0.9 is better.

【００１１】縮小部Ｂのコード横断面形状は、図３に示
すように、外接円が直径ｄの円形である。縮小部Ｂは、
３本の素線２のうち２本又は全部が接触した状態になっ
ているので、コード側面から押し潰しても殆ど潰れるこ
とがないため略楕円形とはならないのである。As shown in FIG. 3, the cross section of the cord of the reduced portion B has a circumscribed circle having a diameter d. The reduction unit B is
Since two or all of the three strands 2 are in contact with each other, even if the cords are squashed from the side of the cord, they are hardly crushed, so that they are not substantially elliptical.

【００１２】また、縮小部Ｂのコード長手方向長さは極
力短くしてあり、コード撚りピッチの１／３以下、好ま
しくは１／５〜１／３にしている。縮小部Ｂはコード内
部にゴムを浸透しにくくする部分であるので、この部分
のコード長手方向長さをなるべく短くすることによりし
てゴム浸透性を高めることができる。さらに、隣り合う
二つの縮小部Ｂの相互間隔はコード撚りピッチの２倍以
上、好ましくは２倍〜４倍にしている（図１では２ピッ
チ）。撚りの形状安定性に悪影響を与えない範囲で縮小
部Ｂの相互間隔をなるべく長くすることにより、ゴム浸
透性を高めることができる。このように、縮小部Ｂのコ
ード長手方向長さをコード撚りピッチの１／３以下にす
ると共に、隣接する二つの縮小部Ｂの相互間隔をコード
撚りピッチの２倍以上にしていることにより、縮小部Ｂ
をなるべく少ない数でコード長手方向にピンポイント状
の配置にし、たとえ素線間に位置ずれが生じてもその位
置が直ちに復元することが可能になるため、撚りの形状
安定性に悪影響を与えることなく、ゴム浸透性を良好に
することができる。The length of the reduced portion B in the longitudinal direction of the cord is made as short as possible, and is set to 1/3 or less, preferably 1/5 to 1/3 of the cord twist pitch. Since the reduced portion B is a portion that makes it difficult for the rubber to penetrate into the cord, the rubber permeability can be increased by shortening the length of this portion in the cord longitudinal direction as much as possible. Furthermore, the mutual interval between two adjacent reduced portions B is set to be at least twice the cord twist pitch, preferably 2 to 4 times (two pitches in FIG. 1). The rubber permeability can be increased by increasing the mutual interval between the reduced portions B as far as possible without adversely affecting the shape stability of the twist. As described above, the length of the cord in the longitudinal direction of the reduced portion B is set to 1/3 or less of the cord twist pitch, and the interval between two adjacent reduced portions B is set to be twice or more the cord twist pitch. Reduction part B
As few pins as possible in the longitudinal direction of the cord, and even if there is a misalignment between the wires, the position can be restored immediately, which adversely affects the dimensional stability of the twist. And good rubber permeability.

【００１３】さらに、上記スチールコードは、縮小部Ｂ
の直径ｄと拡大部Ａの長径ｂとの比ｂ／ｄが１．１〜
１．４５になっている。ｂ／ｄが１．１未満では殆ど扁
平でなくなるのでコードの型崩れが生じ易くなり、一
方、ｂ／ｄが１．４５超では長径ｂが大きくなり過ぎて
素線２がダメージを受けるようになる。本発明のスチー
ルコードにおいて、素線２の径としては、０．２７〜
０．２９ｍｍの範囲で設定するのがよい。また、コード
撚りピッチは、１２〜１４ｍｍであるのがよい。[0013] Further, the steel cord has a reduced portion B
B / d of the diameter d and the major diameter b of the enlarged portion A is 1.1 to 1.1.
It is 1.45. When b / d is less than 1.1, the cord becomes almost flat and the cord is likely to be out of shape. On the other hand, when b / d exceeds 1.45, the major diameter b becomes too large and the strand 2 is damaged. Become. In the steel cord of the present invention, the diameter of the strand 2 is 0.27 to
It is better to set within the range of 0.29 mm. Further, the cord twisting pitch is preferably 12 to 14 mm.

【００１４】[0014]

【実施例】素線径０．２８ｍｍ、撚りピッチ１２ｍｍを
有する１×３構造で、表１に示す諸元をそれぞれ有する
スチールコード（実施例１〜３、比較例１〜２）につ
き、下記によりゴム浸透性および撚りの形状安定性を評
価した。この結果を表１に示す。EXAMPLE A steel cord (Examples 1 to 3 and Comparative Examples 1 to 2) having a wire diameter of 0.28 mm and a twist pitch of 12 mm and having the specifications shown in Table 1 was obtained as follows. Rubber penetration and twist stability were evaluated. Table 1 shows the results.

【００１５】ゴム浸透性：各スチールコードをゴム中に
埋込み、加硫後コードを取出し、取出したコード内の空
隙の有無および大きさを目視にて観察することにより、
比較例１を１００として指数評価した（指数が大ほどゴ
ム浸透性に優れていることを意味する）。撚りの形状安定性 ：コードをローラーに接触させてその
ローラーを通過させた後の撚りの形状安定度を目視で測
定した。素線が元の位置に復帰し、片寄らないことを確
認した。 Rubber permeability : Each steel cord is embedded in rubber, the cord is taken out after vulcanization, and the presence or absence and size of voids in the taken cord are visually observed.
The index was evaluated by setting Comparative Example 1 to 100 (the larger the index, the better the rubber permeability). Twist shape stability : Twist shape stability after the cord was brought into contact with a roller and passed through the roller was measured visually. It was confirmed that the strand returned to its original position and did not shift.

【００１６】[0016]

【表１】 [Table 1]

【００１７】表１から明らかなように、本発明に係わる
スチールコード（実施例１〜３）は、比較例１〜２に比
して、ゴム浸透性および撚りの形状安定性の両方を確保
することができる。As is apparent from Table 1, the steel cords according to the present invention (Examples 1 to 3) ensure both rubber permeability and twist stability in comparison with Comparative Examples 1 and 2. be able to.

【００１８】[0018]

【発明の効果】以上説明したように本発明では、ゴム／
金属コード複合体を構成する１×３構造のスチールコー
ドが、コード横断面の外接円が扁平な略楕円形で前記素
線が互いに離隔状態になっている拡大部と、コード横断
面の外接円が略円形で前記素線の少なくとも２本が接触
している縮小部とが長手方向に交互に配列した構成から
なり、前記拡大部は前記外接楕円形の短径ａと長径ｂと
の比ａ／ｂで定義される扁平比が０．７〜０．９、該長
径ｂと前記縮小部の外接円直径ｄとの比ｂ／ｄが１．１
〜１．４５であり、前記縮小部は長手方向の長さがコー
ド撚りピッチの１／３以下であって、隣接する縮小部と
の間隔がコード撚りピッチの２倍以上であるため、その
スチールコードの撚りの形状安定性を確保しながら良好
なゴム浸透性を得ることが可能となる。As described above, in the present invention, the rubber /
A steel cord having a 1 × 3 structure constituting a metal cord composite has an enlarged portion in which a circumscribed circle of the cord cross section is flat and substantially elliptical and the wires are separated from each other, and a circumscribed circle of the cord cross section. Are substantially circular, and the reduced portions in which at least two of the strands are in contact with each other are alternately arranged in the longitudinal direction. The enlarged portion has a ratio a between the minor axis a and the major axis b of the circumscribed ellipse. / B is 0.7 to 0.9, and the ratio b / d between the major diameter b and the circumscribed circle diameter d of the reduced portion is 1.1.
The length of the reduced portion is 1/3 or less of the cord twist pitch, and the interval between adjacent reduced portions is at least twice the cord twist pitch. Good rubber permeability can be obtained while securing the twist stability of the cord.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明に係わるスチールコードを模式的に示す
側面図である。FIG. 1 is a side view schematically showing a steel cord according to the present invention.

【図２】図１のＡ部横断面図である。FIG. 2 is a cross-sectional view of a portion A in FIG.

【図３】図１のＢ部横断面図である。FIG. 3 is a transverse sectional view of a portion B in FIG. 1;

【符号の説明】[Explanation of symbols]

１ スチールコード ２ 素線 1 steel cord 2 strand

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 ３本の素線を撚り合わせた１×３構造の
スチールコードをゴムに埋設した複合体であり、前記ス
チールコードはコード横断面の外接円が扁平な略楕円形
で前記素線が互いに離隔状態になっている拡大部と、コ
ード横断面の外接円が略円形で前記素線の少なくとも２
本が接触している縮小部とが長手方向に交互に配列した
構成からなり、前記拡大部は前記外接楕円形の短径ａと
長径ｂとの比ａ／ｂで定義される扁平比が０．７〜０．
９、該長径ｂと前記縮小部の外接円直径ｄとの比ｂ／ｄ
が１．１〜１．４５であり、前記縮小部は長手方向の長
さがコード撚りピッチの１／３以下であって、隣接する
縮小部との間隔がコード撚りピッチの２倍以上であるゴ
ム／金属コード複合体。1. A composite in which a steel cord having a 1 × 3 structure in which three strands are twisted is embedded in rubber, wherein the steel cord has a substantially elliptical shape having a flat circumscribed circle in a cross section of the cord. An enlarged portion in which the wires are separated from each other;
The enlarged portion has a flattening ratio defined by the ratio a / b of the minor axis a to the major axis b of the circumscribed ellipse of 0. 0.7-0.
9. Ratio b / d between the major diameter b and the circumscribed circle diameter d of the reduced portion
Is 1.1 to 1.45, and the length of the reduced portion in the longitudinal direction is not more than 1/3 of the cord twist pitch, and the interval between adjacent reduced portions is not less than twice the cord twist pitch. Rubber / metal cord composite. 【請求項２】 前記素線の径が０．２７〜０．２９ｍｍ
である請求項１記載のゴム／金属コード複合体。2. The wire having a diameter of 0.27 to 0.29 mm.
The rubber / metal cord composite according to claim 1, which is: 【請求項３】 前記コード撚りピッチが１２〜１４ｍｍ
である請求項１又は２記載のゴム／金属コード複合体。3. The cord twist pitch is 12 to 14 mm.
The rubber / metal cord composite according to claim 1 or 2, wherein
JP9076003A 1997-03-27 1997-03-27 Rubber/metal cord composite Pending JPH10266083A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9076003A JPH10266083A (en) 1997-03-27 1997-03-27 Rubber/metal cord composite

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9076003A JPH10266083A (en) 1997-03-27 1997-03-27 Rubber/metal cord composite

Publications (1)

Publication Number Publication Date
JPH10266083A true JPH10266083A (en) 1998-10-06

Family

ID=13592640

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9076003A Pending JPH10266083A (en) 1997-03-27 1997-03-27 Rubber/metal cord composite

Country Status (1)

Country Link
JP (1) JPH10266083A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101446894B1 (en) * 2011-12-14 2014-10-07 한국타이어 주식회사 Manufacturing method of pneumatic tire

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101446894B1 (en) * 2011-12-14 2014-10-07 한국타이어 주식회사 Manufacturing method of pneumatic tire

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