JP2008126689A - Rubber coated cord for carcass ply, and its manufacturing method and using method - Google Patents

Rubber coated cord for carcass ply, and its manufacturing method and using method Download PDF

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JP2008126689A
JP2008126689A JP2006310244A JP2006310244A JP2008126689A JP 2008126689 A JP2008126689 A JP 2008126689A JP 2006310244 A JP2006310244 A JP 2006310244A JP 2006310244 A JP2006310244 A JP 2006310244A JP 2008126689 A JP2008126689 A JP 2008126689A
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rubber
cord
coated
core
carcass ply
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Tsutomu Saeki
佐伯　　勉
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Bridgestone Corp
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Bridgestone Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To dispose a plurality of rubber coated cords for carcass plies without clearance in the circumference direction of a core of a circular annular form having an external surface shape corresponding to the internal surface shape of a product tire over the entire lengths of the rubber coated cords without generating the mutual overlapping and clearance between the mutual cords when molding the carcass plies by disposing the cords on the core to provide the rubber coated cords capable of effectively preventing enclosure of air into the molded carcass ply and generation of ruggedness on a surface of the carcass ply. <P>SOLUTION: Thickness of the coated rubber 4 in relation to a material cord 3 is made thickest in the center part located corresponding to an equator line of the core, and the thickness of the coated rubber 4 is gradually reduced toward an end part of the material cord 3. Thickness of the rubber coated cord is made thickest in the center part and is made thinnest at both end parts. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

この発明は、製品タイヤの内面形状と対応する外面形状を有する、多くは剛性のコア上で生タイヤを成型する場合に用いて好適なカーカスプライ用ゴム被覆コード、それの製造方法および使用方法に関するものであり、とくには、カーカスプライ用ゴム被覆コードを、コアの円周方向に、相互の重なり合いなしに、隙間なく配設してカーカスプライを成型することを可能とする技術を提案するものである。   The present invention relates to a rubber-coated cord for carcass ply having an outer surface shape corresponding to the inner surface shape of a product tire, and suitable for molding a raw tire on a mostly rigid core, and a method for manufacturing and using the same. In particular, it proposes a technology that makes it possible to mold carcass plies by arranging rubber-covered cords for carcass plies in the circumferential direction of the core without overlapping each other and without gaps. is there.

製品タイヤの内面形状と対応する外面形状を有し、全体として円環形態をなす、分解および組立て可能な剛性コア上で、そのコアのクラウン域を経て、それの一方側から他方側まで延びるカーカスプライ、たとえばラジアル構造になるカーカスプライを成型するに当たっては、素材コードに、それの全長にわたって一定の厚みのゴム被覆を施してなり、従って、太さが全長にわたってほぼ均一なカーカスプライ用ゴム被覆コードを用いることが行われている。   A carcass having an outer shape corresponding to the inner shape of the product tire and extending from one side to the other side of the core through a crown area of the core, on a rigid core that can be disassembled and assembled in a ring shape as a whole When molding a ply, for example, a carcass ply having a radial structure, the material cord is provided with a rubber coating having a constant thickness over the entire length thereof, and thus the rubber-coated cord for a carcass ply having a substantially uniform thickness over the entire length. Is being used.

しかるに、太さが全長にわたって均一なカーカスプライ用ゴム被覆コードの複数本を、円環形態のコアのクラウン域を経て、それの一方の側部から他方の側部まで、たとえば、コアの半径方向に延在させて配設してカーカスプライを成型する場合には、ゴム被覆コードの配設領域での、コアの周長差の故に、コアのクラウン域ではゴム被覆コードの配設密度が小さくなる一方で、コアの側部域では配設密度が大きくなることが不可避である。   However, a plurality of carcass ply rubber-coated cords having a uniform thickness over the entire length are passed through the crown region of the annular core, from one side thereof to the other side, for example, in the radial direction of the core. When the carcass ply is molded by extending the wire, the density of the rubber-coated cord is small in the crown region of the core due to the difference in the circumference of the core in the rubber-coated cord. On the other hand, it is inevitable that the arrangement density increases in the side area of the core.

これがため、複数本のゴム被覆コードを、コア外面の赤道線位置で円周方向に隙間なく配設した時は、周長の短かい、コアの側部部分ではゴム被覆コードが相互に重なり合うことになり、逆に、ゴム被覆コードを、コアの側部で相互に隙間なく配設したときは、周長の長いコアの赤道線部分ではゴム被覆コード間に隙間が生じることになり、これらのいずれの場合にあっても、ゴム被覆コードの相互間への空気の封じ込めが生じたり、成型されたカーカスプライの表面に凹凸が発生したりするという問題があった。   For this reason, when a plurality of rubber-coated cords are arranged without gaps in the circumferential direction at the equator line position on the outer surface of the core, the rubber-coated cords overlap each other at the side portion of the core with a short circumference. Conversely, when rubber-coated cords are arranged without gaps at the sides of the core, gaps are created between the rubber-coated cords at the equator portion of the core with a long circumference. In either case, there is a problem that air is trapped between the rubber-coated cords, and unevenness is generated on the surface of the molded carcass ply.

この発明は、従来技術が抱えるこの様な問題点を解決することを課題とするものであり、それの目的とするところは、製品タイヤの内面形状と対応する外面形状を有する円環形態のコア上に、複数本のカーカスプライ用ゴム被覆コードを配設してカーカスプライを成型するに当り、それぞれのゴム被覆コードを、それら相互の重なり合いも、それらの相互間への隙間の発生もなしに、ゴム被覆コードの全長にわたって、それらをコアの円周方向に隙間なく配設することができ、この結果として、成型されたカーカスプライ内への空気の封じ込めや、カーカスプライ表面への凹凸の発生を効果的に防止できるカーカスプライ用ゴム被覆コード、それの製造方法および使用方法を提供するにある。   An object of the present invention is to solve such problems of the prior art, and the object of the present invention is to provide an annular core having an outer shape corresponding to the inner shape of the product tire. On top of this, when molding a carcass ply with a plurality of carcass ply rubber-covered cords, each rubber-coated cord can be overlapped without any gap between them. The rubber-coated cords can be arranged without gaps in the circumferential direction of the core over the entire length of the rubber-coated cord. As a result, air is trapped in the molded carcass ply and irregularities are generated on the carcass ply surface. It is an object of the present invention to provide a rubber-coated cord for carcass ply that can effectively prevent the above, and a method for producing and using the same.

この発明に係るカーカスプライ用ゴム被覆コードは、製品タイヤの内面形状と対応する内面形状を有し、たとえば、生タイヤの成型から、それに対する加硫成型の終了に到るまで、タイヤと一体的に移送等されるコアの外面上に、ラジアル方向、たとえば、コア赤道線に対して、７０〜９０°の範囲内の角度で交差する方向への延在姿勢で、コアに周長差があってなお、円周方向に隙間なく配設されるものであって、有機繊維コード、金属コード等の素材コードに対する被覆ゴムの厚みを、たとえば剛性のコアの赤道線と対応して位置することになる中央部で最も厚くするとともに、その被覆ゴムの厚みを素材コードの端部に向けて漸減させて、ゴム被覆コードの太さを、中央部で最も太く、両端部で最も細くしてなるものである。   The rubber-coated cord for carcass ply according to the present invention has an inner surface shape corresponding to the inner surface shape of a product tire. For example, from the molding of a raw tire to the end of the vulcanization molding for the tire, it is integrated with the tire. On the outer surface of the core to be transferred to the core, there is a difference in the circumference in the radial direction, for example, in an extending posture in a direction intersecting with the core equator line at an angle within a range of 70 to 90 °. In addition, it is arranged without a gap in the circumferential direction, and the thickness of the covering rubber with respect to the material cord such as the organic fiber cord and the metal cord is positioned corresponding to the equator line of the rigid core, for example. The thickness of the rubber-coated cord is made the thickest at the center and the thinnest at both ends by gradually decreasing the thickness of the coated rubber toward the end of the material cord. It is.

また、この発明に係る、カーカスプライ用ゴム被覆コードの製造方法は、素材コードの周りの被覆ゴムの厚みを、そのコードの延在方向で変化させてなるカーカスプライ用ゴム被覆コードを製造するに当って、長尺コードのゴム被覆ダイへの通過速度を周期的に増減させて、そのコードへの被覆ゴムの厚みを、所要に応じて、たとえば、コアの周長の変化の程度、ゴム被覆コードの打込み密度等に応じて減少および増加させ、ゴム被覆を施されたこの長尺コードを、被覆ゴム厚みの最も薄い個所で、たとえば、定寸的に、または、外径寸法をセンサで確認しながら切断して、単位のゴム被覆コードとするにある。   Also, the method of manufacturing a carcass ply rubber-coated cord according to the present invention is for manufacturing a carcass ply rubber-coated cord in which the thickness of the rubber covering around the material cord is changed in the extending direction of the cord. Then, the passage speed of the long cord to the rubber-coated die is periodically increased and decreased, and the thickness of the coated rubber on the cord is changed according to requirements, for example, the degree of change in the circumference of the core, the rubber coating Decrease and increase the cord according to the driving density of the cord, etc., and check this long cord coated with rubber at the thinnest part of the coated rubber, for example, at a constant size or with a sensor for the outer diameter. The unit is cut into rubber coated cords.

そして、この発明に係る、カーカスプライ用ゴム被覆コードの使用方法は、素材コードに対する被覆ゴムの厚みが中央部で最も厚く、その厚みを、コード端部に向けて漸次薄くしてなるカーカスプライ用ゴム被覆コードの複数本を、製品タイヤの内面形状と対応する外面形状を有するコアの外面上で、カ−カスプライ用ゴム被覆コ−ドの中央部がコアの赤道線上に位置してラジアル方向、これもたとえば、コア赤道線に対して、７０〜９０°の範囲内の角度で交差する方向に延在する状態として、円周方向に隙間なく配設するにある。   And the method of using the rubber-coated cord for carcass ply according to the present invention is the one for carcass ply in which the thickness of the coated rubber with respect to the material cord is the thickest at the center, and the thickness is gradually reduced toward the end of the cord. A plurality of rubber-coated cords are arranged on the outer surface of a core having an outer shape corresponding to the inner shape of the product tire, and the central portion of the rubber-coated cord for carcass ply is positioned on the equator line of the core in the radial direction. This is also, for example, arranged in the circumferential direction without a gap as a state extending in a direction intersecting with the core equator line at an angle within a range of 70 to 90 °.

この発明に係るカーカスプライ用ゴム被覆コードでは、それの中央部の被覆ゴムの厚みを、コアの半径方向での周長変化の程度、ゴム被覆コードの打込み密度等に応じて厚くして、そのゴム被覆コードの太さを、中央部で最も太く、両端部で最も細くすることにより、カーカスプライ用ゴム被覆コードの複数本を、たとえば剛性のコアのラジアル方向に延在させて配設するとともに、それらのゴム被覆コードのそれぞれを、コアの円周方向に隙間なく配設する場合に、ゴム被覆コードの配設密度が小さくなるコアのクラウン域では、そのゴム被覆コードの、厚い被覆ゴムの作用下で、ゴム被覆コード間への隙間の発生を防止し、そして、ゴム被覆コードの配設密度が大きくなるコアの側部域では、薄い被覆ゴムの作用下で、ゴム被覆コードの相互の重なり合いを防止して、それぞれのゴム被覆コードを、それらの全長にわたって隙間なく、かつ重なり合いもなく、コアの円周方向に隣接させて位置させることができるので、ゴム被覆コードを、コアの全周にわたって配設することによって成型されるカーカスプライではそれの内部への空気の封じ込めおよび、カーカスプライ表面への凹凸の発生を十分に防止することができる。   In the carcass ply rubber-coated cord according to the present invention, the thickness of the coated rubber at the center thereof is increased according to the degree of change in the circumferential length in the radial direction of the core, the driving density of the rubber-coated cord, etc. By making the rubber-coated cord thickest at the center and thinnest at both ends, a plurality of rubber-covered cords for carcass plies are arranged extending in the radial direction of a rigid core, for example. When each of these rubber-coated cords is disposed without gaps in the circumferential direction of the core, in the crown region of the core where the arrangement density of the rubber-coated cord becomes small, the rubber-coated cord of the thick coated rubber Under the action, the generation of gaps between the rubber-coated cords is prevented, and in the side region of the core where the arrangement density of the rubber-coated cords is increased, the rubber-coated cords are operated under the action of the thin coated rubber. The rubber-coated cords can be positioned adjacent to each other in the circumferential direction of the core without any gaps and without overlapping over their entire length, preventing mutual overlap. In the carcass ply molded by being disposed over the entire circumference, it is possible to sufficiently prevent air from being contained in the carcass ply and generation of irregularities on the carcass ply surface.

この発明に係る、カーカスプライ用ゴム被覆コードの製造方法では、長尺コードの、ゴム被覆ダイへの通過速度を周期的に増減させて、通過速度の速いときには被覆ゴム厚みを薄く、逆に、遅いときにはその厚みを厚くすることにより、たとえば、ゴム被覆ダイに対するゴムの押出量を増減させて、一定速度の長尺コードに対する被覆ゴムの厚みを変化させる場合に比し、被覆ゴムの厚みを、より高い応答性の下で、より正確にコントロールすることができる。   In the manufacturing method of the rubber-coated cord for carcass ply according to the present invention, the passage speed of the long cord to the rubber-covered die is periodically increased and decreased. By increasing the thickness when it is slow, for example, by increasing or decreasing the amount of rubber extrusion to the rubber-coated die, and changing the thickness of the coated rubber for a long cord at a constant speed, More accurate control can be achieved under higher responsiveness.

またここでは、長尺コードの通過速度を周期的に増減させることで、長尺コードに、被覆ゴムの同等の厚み変化をもつ多数の部分を簡易・迅速に形成することができる。   Further, here, by periodically increasing or decreasing the passing speed of the long cord, a large number of portions having the same thickness change of the covering rubber can be easily and quickly formed on the long cord.

ところでこの場合の、長尺コードの、ゴム被覆ダイへの通過速度、ひいては、長尺コードに被覆するゴムの厚みは、前述したように、コアの半径方向での周長変化の程度、ゴム被覆コードの打込み密度その他に応じて適宜に選択することができる。   Incidentally, in this case, the passing speed of the long cord to the rubber-coated die, and hence the thickness of the rubber covering the long cord, as described above, the degree of change in the circumferential length in the radial direction of the core, the rubber coating It can be selected as appropriate according to the cord driving density and the like.

そしてここでは、このようにしてゴム被覆を施された長尺コードを、被覆ゴム厚みの最も薄い個所で切断することで、所定の長さを有するとともに、被覆ゴムの、所定の厚み分布をもつ多数本のカーカスプライ用ゴム被覆コードを能率よく製造することができる。   And here, by cutting the long cord thus coated with rubber at the thinnest portion of the coated rubber thickness, it has a predetermined length and a predetermined thickness distribution of the coated rubber. A large number of rubber-coated cords for carcass ply can be efficiently manufactured.

さらに、この発明に係る、カーカスプライ用ゴム被覆コードの使用方法では、素材コードに対する被覆ゴムの厚みが、中央部で最も厚く、コード端部に向けて漸次薄くなって、太さが中央部で最も太く、両端部で太さが最も細くなるカーカスプライ用ゴム被覆コードの複数本を、前述したようなコアの外面上で、そのコアのラジアル方向への延在姿勢で、円周方向に隙間なく配設して、それぞれのゴム被覆コードを、それらの全長にわたって隙間なく、かつ重なり合いもなく位置させることにより、成型されるカーカスプライの内部への空気の封じ込めおよび、そのカーカスプライ表面への凹凸の発生のおそれを効果的に取り除くことができる。   Furthermore, in the method of using the rubber-coated cord for carcass ply according to the present invention, the thickness of the coated rubber with respect to the material cord is the thickest at the central portion and gradually decreases toward the end of the cord, and the thickness is at the central portion. A plurality of rubber-covered cords for carcass plies, which are the thickest and the thinnest at both ends, are spaced in the circumferential direction on the outer surface of the core as described above, with the core extending in the radial direction. By arranging the rubber-coated cords without any gaps and overlappings over their entire length, it is possible to contain air inside the carcass ply to be molded and unevenness on the surface of the carcass ply. The risk of occurrence can be effectively removed.

図１は、カーカスプライ用のゴム被覆コードの実施形態を示す断面図であり、図中１は、そのカーカスプライ用ゴム被覆コードの全体を示す。   FIG. 1 is a cross-sectional view showing an embodiment of a rubber-covered cord for carcass ply, in which 1 indicates the entire rubber-coated cord for carcass ply.

このゴム被覆コード１は、全体として円環形態をなす、図２にその一部を略線斜視図で示すような、たとえば剛性のコア２の外面上に、それのラジアル方向への延在姿勢で、コア２の円周方向に隙間なく配設されて、そのコア上にカーカスプライを成型するべく機能するものである。   The rubber-coated cord 1 has an annular shape as a whole. As shown in a schematic perspective view of a part of the rubber-coated cord 1, for example, on the outer surface of the rigid core 2, its extending posture in the radial direction is shown in FIG. Thus, the core 2 is disposed without any gap in the circumferential direction, and functions to mold a carcass ply on the core.

ここで、円環形態のコア２は、図２に仮想線で示す製品タイヤＴの内面形状と対応する外面形状を有し、その外面上に成型された生タイヤとともに加硫モールド内へ装入され、そして、加硫を終えた製品タイヤＴから、セグメント状に分解した状態で取り出される。   Here, the ring-shaped core 2 has an outer surface shape corresponding to the inner surface shape of the product tire T shown by the phantom line in FIG. 2, and is inserted into the vulcanization mold together with the green tire molded on the outer surface. Then, it is taken out from the product tire T that has been vulcanized in a segmented state.

このようなコア２の外面上に、たとえば、それの赤道線Ｅに対して７０〜９０°の範囲内の角度で変差するラジアル方向への延在姿勢で配設されるカーカスプライ用ゴム被覆コード１は、有機繊維コード、金属コード等の素材コード３の周りに未加硫ゴムを被覆するとともに、その被覆ゴム４の厚みを、コア２の赤道線Ｅと対応させて配置されることになる中央部で最も厚く、そしてコード端で最も薄くしてなり、それらの間での被覆ゴム厚みを、コア２に対する、カーカスプライ用ゴム被覆コード１の配設域での、コア２の半径方向位置応じた周長変化の程度、ゴム被覆コード１の所要の打ち込み密度その他に応じて漸次変化させてなる。   On the outer surface of the core 2, for example, a carcass ply rubber coating disposed in a radially extending posture that varies at an angle within a range of 70 to 90 ° with respect to its equator line E. The cord 1 covers an unvulcanized rubber around a material cord 3 such as an organic fiber cord or a metal cord, and the thickness of the coated rubber 4 is arranged so as to correspond to the equator line E of the core 2. The core 2 is the thickest and the cord end is the thinnest, and the thickness of the coated rubber between them is set in the radial direction of the core 2 in the region where the carcass ply rubber-coated cord 1 is disposed with respect to the core 2. It is gradually changed in accordance with the degree of change in the circumference according to the position, the required driving density of the rubber-coated cord 1, and the like.

これにより、カーカスプライ用ゴム被覆コード１は、図１（ｂ）、（ｃ）に示すように、それの中央部で最大外径を有することになり、両端部で最小の外径を有することになる。   As a result, the carcass ply rubber-coated cord 1 has a maximum outer diameter at the center thereof and a minimum outer diameter at both ends as shown in FIGS. 1 (b) and 1 (c). become.

このように構成してなるカーカスプライ用ゴム被覆コード１を用いてコア２の外面上にカーカスプライを成型する場合には、そのゴム被覆コード１の複数本を、それらの各コード１の中央部がコア２の赤道線Ｅ上に位置し、各々がラジアル方向に延在する姿勢として、円周方向に隙間なく、かつ相互の重なり合いもなしに配設し、このことをコア２の全周にわたって行う。   When the carcass ply is molded on the outer surface of the core 2 using the thus configured carcass ply rubber-coated cord 1, a plurality of the rubber-coated cords 1 are arranged at the center of each cord 1. Are positioned on the equator line E of the core 2 and each of them extends in the radial direction without any gap in the circumferential direction and without overlapping each other. Do.

このことによれば、コア２の外面の周長差の故に、ゴム被覆コード１の配設密度が小さくなるコア２のクラウン域では、それぞれのゴム被覆コード１の厚い被覆ゴム４が相互の間隔を十分に埋め込んで、これらの間への隙間の発生を防止するべく機能し、一方、ゴム被覆コード１の配設密度が大きくなるコアの側部域では、それぞれのゴム被覆コード１の薄い被膜ゴム４が、コード相互の重なり合いを防止するべく機能することになるので、成型されるカーカスプライの内部への空気の封じ込めおよび、カーカスプライ表面への凹凸の発生が十分に防止されることになる。   According to this, in the crown region of the core 2 where the arrangement density of the rubber-coated cords 1 becomes small due to the difference in the circumferential length of the outer surface of the core 2, the thick coated rubbers 4 of the respective rubber-coated cords 1 are spaced from each other. In the side region of the core where the arrangement density of the rubber-coated cords 1 is increased, and the thin coating of each rubber-coated cord 1 Since the rubber 4 functions to prevent the cords from being overlapped with each other, it is possible to sufficiently prevent air from being contained inside the molded carcass ply and unevenness on the carcass ply surface. .

ところで、素材コード３の周りの未加硫被覆ゴム４の厚みの、そのコード３の延在方向でのこのように変化は、たとえば、押出機ヘッドに取付けた、図３に断面で例示するようなゴム被覆ダイ５、ひいては、そのダイ内へ押出されるゴム６に対する素材コード３の通過速度を変更することによって実現することができ、この場合、被覆ゴム４の厚みは、素材コード３の通過速度に対して、図４に模式的に示すように変化することになり、通過速度の増加に伴って、被覆ゴム４の厚みは次第に減少することになる。   By the way, such a change in the thickness of the unvulcanized coating rubber 4 around the material cord 3 in the extending direction of the cord 3 is, for example, illustrated in a cross section in FIG. 3 attached to the extruder head. This can be realized by changing the passing speed of the material cord 3 with respect to the rubber-covered die 5 and, consequently, the rubber 6 extruded into the die. In this case, the thickness of the covering rubber 4 is the passage of the material cord 3 The speed changes as schematically shown in FIG. 4, and the thickness of the covering rubber 4 gradually decreases as the passing speed increases.

素材コード３に対する被覆ゴム４の厚みを以上のように変化させてなるカーカスプライ用ゴム被覆コード１の製造は、たとえば、図３に示すところにおいて、素材コード３を長尺コードとし、それのゴム被覆ダイ５への通過速度を周期的に増減させて、そのコードに被覆されるゴムの厚みを、前述したように、コア２に対する、ゴム被覆コード１の配設域での、コア２の半径方向位置に応じた周長変化の程度、ゴム被覆コード１の所要の打込み密度その他に対応させて漸次減少および増加させ、そして、ゴム被覆を施されたその長尺コードを、被覆ゴム厚みの最も薄い個所で、定寸切断または、センサによって被覆ゴム厚みを直接的もしくは間接的に確認しながら切断して単位のゴム被覆コード１とすることによって行うことができ、これによれば、被覆ゴム４の厚みが高精度にコントロールされた、所期した通りのゴム厚み分布をもつ多数本のゴム被覆コード１を能率よく製造することができ、結果物としての、カーカスプライ用ゴム被覆コード１は、それの一本ずつを、図５に断面図で模式的に示すように、コア２の外面上に順次に配設することで、先にも述べたように、空気の封じ込めも、表面凹凸の発生もないカーカスプライをそのコア上に成型することができる。   For example, in the production of the carcass ply rubber-coated cord 1 in which the thickness of the coated rubber 4 with respect to the material cord 3 is changed as described above, the material cord 3 is a long cord as shown in FIG. The passage speed to the coating die 5 is periodically increased or decreased, and the thickness of the rubber coated on the cord is set to the radius of the core 2 in the region where the rubber coated cord 1 is disposed with respect to the core 2 as described above. Gradually decrease and increase in accordance with the degree of change in circumferential length in accordance with the direction position, the required driving density of the rubber-coated cord 1, and the like. This can be done by cutting at a thin spot or cutting it to make the unit rubber-coated cord 1 by directly or indirectly checking the thickness of the coated rubber with a sensor. As a result, it is possible to efficiently produce a large number of rubber-coated cords 1 having a desired rubber thickness distribution in which the thickness of the coated rubber 4 is controlled with high accuracy, and for the resulting carcass ply. The rubber-coated cords 1 are arranged one by one on the outer surface of the core 2 as shown schematically in the cross-sectional view of FIG. A carcass ply can be molded on the core without any containment or surface irregularities.

サイズが１１Ｒ２２．５のトラックバス用タイヤを製造すべく、直径２ｍｍのスチールコードからなる素材コードにゴム被覆を施してなるカーカスプライ用ゴム被覆コードを用い、剛性コアの外面上で、一枚のカーカスプライを、ゴム被膜コードの相互の重なり合いなしに成型した。   In order to manufacture tires for trucks and buses with a size of 11R22.5, a rubber-coated cord for carcass ply made by applying a rubber coating to a material cord made of a steel cord having a diameter of 2 mm is used. The carcass plies were molded without any overlapping of rubber coated cords.

この場合、ゴム被覆コードの外径をその全長にわたって２．５０ｍｍとした従来技術および、ゴム被覆コードの外径を、それの中央部で３．１０ｍｍ、両端部で２．５０ｍｍとした発明例のいずれにおいても、総計１２００本のゴム被覆コードによって一枚のカーカスプライを成型した。   In this case, the conventional technology in which the outer diameter of the rubber-coated cord is 2.50 mm over its entire length and the invention example in which the outer diameter of the rubber-coated cord is 3.10 mm at the center and 2.50 mm at both ends. In any case, one carcass ply was molded with a total of 1200 rubber-coated cords.

成型されたカーカスプライの外表面で、コアの赤道線に対応する部分での、表面凹凸量を測定したところ、従来技術では０．０８ｍｍであったのに対し、発明例では０．０１ｍｍであった。   When the surface unevenness at the portion corresponding to the equator line of the core on the outer surface of the molded carcass ply was measured, it was 0.08 mm in the prior art, and 0.01 mm in the invention example. It was.

カーカスプライ用ゴム被覆コードの実施形態を示す断面図である。It is sectional drawing which shows embodiment of the rubber covering cord for carcass plies. コアの一部を示す略線斜視図である。It is a rough-line perspective view which shows a part of core. 被覆ゴムの形成例を示す断面図である。It is sectional drawing which shows the example of formation of covering rubber. コード速度に対する被覆ゴム厚みの変化の傾向を模式的に示すグラフである。It is a graph which shows typically the tendency of change of covering rubber thickness to cord speed. ゴム被覆コードの、コアの外面上への配設態様を模式的に示す断面図である。It is sectional drawing which shows typically the arrangement | positioning aspect on the outer surface of a core of a rubber covering cord.

符号の説明Explanation of symbols

１ カーカスプライ用ゴム被覆コード
２ コア
３ 素材コード
４ 被覆ゴム
５ ゴム被覆ダイ
６ ゴム
Ｅ 赤道線
Ｔ 製品タイヤ 1 Rubber covered cord for carcass ply 2 Core 3 Material code 4 Covered rubber 5 Rubber coated die 6 Rubber E Equatorial line T Product tire

Claims (3)

製品タイヤの内面形状と対応する外面形状を有するコアの外面上に、ラジアル方向への延在姿勢で、円周方向に隙間なく配設されるカーカスプライ用ゴム被覆コードであって、
素材コードに対する被覆ゴムの厚みを、コアの赤道線と対応して位置することとなる中央部で最も厚くするとともに、その被覆ゴムの厚みを素材コードの端部に向けて漸減させて、ゴム被覆コードの太さを、中央部で最も太く、両端部で最も細くしてなるカーカスプライ用ゴム被覆コード。 A rubber-covered cord for carcass ply disposed on the outer surface of a core having an outer surface shape corresponding to the inner surface shape of a product tire, with a radially extending posture and with no gap in the circumferential direction,
The thickness of the covering rubber with respect to the material cord is made the thickest at the center part corresponding to the equator line of the core, and the thickness of the covering rubber is gradually reduced toward the end of the material cord, so that the rubber covering Rubber-coated cord for carcass ply with the cord being thickest at the center and thinnest at both ends. 素材コードの周りの被覆ゴムの厚みを、そのコードの延在方向で変化させてなるカーカスプライ用ゴム被覆コードを製造するに当り、
長尺コードの、ゴム被覆ダイへの通過速度を周期的に増減させて、そのコードへの被覆ゴムの厚みを減少および増加させ、ゴム被覆を施されたこの長尺コードを、被覆ゴム厚みの最も薄い個所で切断して単位のゴム被覆コードとするカーカスプライ用ゴム被覆コードの製造方法。 In manufacturing a rubber-coated cord for carcass ply in which the thickness of the coated rubber around the material cord is changed in the extending direction of the cord,
The passage speed of the long cord to the rubber-coated die is periodically increased or decreased to decrease and increase the thickness of the coated rubber to the cord. A method for producing a rubber-coated cord for carcass ply, which is cut at the thinnest point to form a rubber-coated cord as a unit. 素材コードに対する被覆ゴムの厚みが中央部で最も厚く、その被覆ゴムの厚みを、コード端部に向けて漸次薄くしてなるカーカスプライ用ゴム被覆コードの複数本を、製品タイヤの内面形状と対応する外面形状を有するコアの外面上で、カーカスプライ用ゴム被覆コードの中央部がコアの赤道線上に位置してラジアル方向に延在する状態として、円周方向に隙間なく配設するカーカスプライ用ゴム被覆コードの使用方法。   Corresponding to the shape of the inner surface of the product tire, the number of rubber coated cords for carcass ply, which is the thickest of the coated rubber with respect to the material cord, is the thickest at the center, and the thickness of the coated rubber is gradually reduced toward the cord end For the carcass ply arranged on the outer surface of the core having the outer surface shape so that the central portion of the rubber-coated cord for carcass ply is positioned on the equator line of the core and extends in the radial direction without any gap in the circumferential direction. How to use rubber coated cords.
JP2006310244A 2006-11-16 2006-11-16 Rubber coated cord for carcass ply, and its manufacturing method and using method Withdrawn JP2008126689A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102057884B1 (en) * 2018-04-18 2019-12-20 넥센타이어 주식회사 Tire

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102057884B1 (en) * 2018-04-18 2019-12-20 넥센타이어 주식회사 Tire

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