JP2004050455A - Method for forming bending part to material for carcass ply - Google Patents

Method for forming bending part to material for carcass ply Download PDF

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Publication number
JP2004050455A
JP2004050455A JP2002207666A JP2002207666A JP2004050455A JP 2004050455 A JP2004050455 A JP 2004050455A JP 2002207666 A JP2002207666 A JP 2002207666A JP 2002207666 A JP2002207666 A JP 2002207666A JP 2004050455 A JP2004050455 A JP 2004050455A
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Japan
Prior art keywords
carcass ply
bent portion
forming
ply material
carcass
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Pending
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JP2002207666A
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Japanese (ja)
Inventor
Takahiro Kimura
木村　隆弘
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Bridgestone Corp
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Bridgestone Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for forming a bending part to a material for a carcass ply, enabling the proper abutting joining of both ends of the material for the carcass ply over the entire width thereof without lowering molding work efficiency when the carcass band is molded. <P>SOLUTION: When bending parts 3 of three places bent in a direction wound around a bead core are formed to the respective side parts 2 wound around the bead core of the material 1 of the carcass ply including a plurality of cords mutually arranged in parallel, the total length of the material 1 for the carcass ply at the bending parts 3 is made 0.95-1.05 times the total length before bending processing. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
この発明は、カーカスプライ用素材への折り曲げ部形成方法、とくには、カーカスバンドの形成に供されるカーカスプライ用素材のそれぞれの側部部分に、ビードコアの周りに巻き付く向きに折れ曲がる折り曲げ加工部を形成する方法に関するものである。
【０００２】
【従来の技術】
たとえば、相互に並列配置された複数本のスチールコードにゴム被覆を施してなるカーカスプライ用素材の、ビードコアの周りに巻き回される各側部部分に、ビードコアに巻き付く向きに折れ曲がる一個所以上の折り曲げ加工部を設けることは、出願人の先願に係る特開２００１−２４６６７５号公報および特開２００２−５９４９２号公報その他に開示されている。
【０００３】
【発明が解決しようとする課題】
ところで、このような折り曲げ加工部を形成した場合には、主には、相互に隣接するコード間に入り込んだ未加硫被覆ゴムの変形に起因して、その折り曲げ加工部での、カーカスプライ用素材の全長が、それの、折り曲げ加工前の所定の全長に比し、長くなったり、短くなったりすることがしばしばあった。
【０００４】
ここで、折り曲げ加工部の全長が長くなりすぎたときは、そのカーカスプライ用素材をバンド成型ドラム上に巻き付けてカーカスバンドを成型するに当り、図８（ａ）に示すように、カーカスプライ用素材のジョイント部で、折り曲げ加工部の端部分が相互に重なり合うことになるため、その重なり部分を作業者の手作業によって切断することが必要になり、この切断作業が成型作業能率の低下をもたらす他、その切断作業によって、カーカスプライ用素材の全幅にわたって延びるコードの一本以上を取り除くことに起因して、カーカスバンドの中央部分での適正なるジョイントが妨げられてそこに隙間が発生するという、タイヤの製品品質上および外観上の問題が生じることもあった。
【０００５】
この一方で、折り曲げ加工部の長さが短くなりすぎた場合には、図８（ｂ）に示すように、カーカスバンドの成型に当って、折り曲げ加工部のジョイントが不能となるため、これもまた、製品品質上および外観上の問題が生じることがあった。
【０００６】
この発明は、従来技術が抱えるこのよう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、両側部部分に折り曲げ加工部を形成したカーカスプライ用素材を成型ドラム上に巻き付けてカーカスバンドを成型するに当って、そのカーカスプライ用素材の両端を、成型作業能率の低下なしに、それらの全幅のわたって適正に突き合わせ接合させることを可能とした、カーカスプライ用素材への折り曲げ部形成方法を提供するにある。
【０００７】
【課題を解決するための手段】
この発明に係るカーカスプライ用素材への折り曲げ部形成方法は、相互に並列配置された複数本のコードを含み、成型ドラム上に巻き付けられて、円筒状のカーカスバンドを構成する、ゴム被覆状態もしくはすだれ織り状態のカーカスプライ用素材の、ビードコアの周りに巻き回される各側部部分に、ビードコアに巻き付く向きに折れ曲がる一個所以上の折り曲げ加工部を形成するに当って、カーカスプライ用素材の折り曲げ加工部でのそれの全長を、折り曲げ加工前の全長、いいかえれば、カーカスプライ用素材の幅方向中央部での全長の０．９５〜１．０５倍とするにある。
【０００８】
これによれば、カーカスプライ用素材を、従来技術で述べたように、成型ドラム上に巻き付けて、全体として円筒状をなすカーカスバンドを成型するに当り、カーカスプライ用素材の折り曲げ加工部の、上記範囲内の伸縮量に基づき、カーカスプライ用素材を、折り曲げ加工部をも含む全幅にわたって常に適正に突き合わせる接合させることができ、これがため、オーバラップジョイント、ジョイント不能等の発生のおそれを十分に除去して、タイヤの、高い製品品質およびすぐれた外観を確実に実現することができる。
【０００９】
ここで、カーカスプライ用素材の各側部部分に三箇所以上の折り曲げ加工部を形成する場合には、ビードコアの断面輪郭形状が円形であると角形であるとの別なく、それぞれの側部部分を、ビードコア周面により正確に沿わせて延在させるとともに、その側部部分を、ビードコアをもってより強固に保持することができる。
【００１０】
また好ましくは、カーカスプライ用素材の折り曲げ加工部でのそれの全長を、折り曲げ加工前の全長の０．９９〜１．０１の範囲とし、これにより、カーカスバンドの成型時における、カーカスプライ用素材の端面相互の、全幅にわたる突き合わせ接合を、その素材を実質的に変形等させることなく、より適切に行うことができる。
【００１１】
ところで、ここにおける折り曲げ加工部は、断面形状がほぼＶ字状の押込刃を有する回転ロールと、溝付きの固定アンビルとによって形成すること、断面形状がほぼＶ字状の押込刃を有する回転ロールと、溝付きアンビルロールとによって形成することまたは、断面形状がほぼＶ字状の押込刃を有する昇降平板と、溝付きの固定アンビルとによって形成すること等が好ましく、これらのいずれによっても、カーカスプライ用素材の側部部分の所定位置を、押込刃をもってアンビル溝内へ連続的に、または間欠的に押し込むことにより、コードの延在方向と交差する方向、多くはほぼ直交する方向に延びる折り曲げ加工部を、簡単に、かつ所期した通りに形成することができる。
【００１２】
【発明の実施の形態】
以下にこの発明の実施の形態を図面に示すところに基いて説明する。
図１は、この発明に係る方法の実施の形態を示す斜視図であり、図中１は、カーカスプライ用素材を示す。
【００１３】
ここで、このカーカスプライ用素材１は、たとえば、所定の本数のスチールコードの相互を平行に引き揃え配設するとともに、それらのスチールコードに一体的にゴム被覆を施してなり、かかるカーカスプライ用素材１は、成型ドラム上にそれの一周にわたって巻き付けて、その両端を接合させることで、全体としてほぼ円筒状のカーカスバンドを構成することができる。
【００１４】
ここでは、このようなカーカスバンドとされる以前のカーカスプライ用素材１の、ビードコアの周りに巻き回されることとなる各側部部分２に、図１（ａ）に仮想線で示すように、コードの延在方向と交差する方向、たとえば直交する方向に延びる一個所以上、図では三個所の折り曲げ加工部を形成する。
図１（ｂ）は、各側部部分２にそれぞれの折り曲げ加工部３を形成した後の状態を示し、これらのた各折り曲げ加工部３はいずれも、側部部分２を、ビードコアに巻き付く向きに折り曲げる。
【００１５】
またここでは、このようにして形成した折り曲げ加工部３の位置での素材１の全長Ｌ０を、折り曲げ加工部３を形成する前の素材１の全長Ｌ１の０．９５〜１０．５倍、より好ましくは０．９９〜１．０１倍の範囲とする。
全長比Ｌ１／Ｌ０をこのように選択することにより、折り曲げ加工部３を形成したカーカスプライ用素材１を、図２に示すように、所定の外径を有する成形ドラム４上にそれの一周にわたって巻き付けてカーカスバンド５を構成するに当って、その素材１のそれぞれの端面を、それらの間への隙間の発生も、両端部分の重なり合いもなしに、素材１の全幅にわたって適切に突き合わせ接合させることができる。
従ってここでは、カーカスバンド５の成型作業を能率良く行うことができ、また、常にすぐれた製品品質および外観をもたらすことができる。
【００１６】
ところで、各側部部分２の折り曲げ加工部３は、たとえば図３に示すように、半径方向の断面形状がほぼＶ字状をなす押込刃６を有する回転ロール７と、これもほぼＶ字状をなす溝８を有する固定アンビル９とを用い、押込刃６をもって、側部部分２の所要部位を溝８内に押し込むとともに、ロール７を回転させて、それを溝８に沿わせて直線状に進出変位させることによって形成することができる。
【００１７】
また、このような折り曲げ加工部３は、図４（ａ）に示すように、前述したと同様の回転ロール１０と、Ｖ溝１１を有するアンビルロール１２とを協働させること、または、図４（ｂ）に示すように、先に述べた固定アンビル９と同様の、溝１３を有する固定アンビル１４と、縦断面形状がほぼＶ字状をなす押込刃１５を有する昇降平板１６とを協働させることによって形成することもできる。
なお、前者の場合には、回転ロール１０およびアンビルロール１２のそれぞれを、両者の回転下で、カーカスプライ用素材１に対して、相互に同期させて直線変位させることにより、素材１の全長にわたって折り曲げ加工部３を形成することができ、後者の場合には、一定位置で昇降変位だけを行う昇降平板１６および固定アンビル１４に対して、カーカスプライ用素材１を直線的に変位させることによってそれの全長にわたって折り曲げ加工部３を形成することができる。
【００１８】
【実施例】
実施例１
回転ロールと固定アンビルとを用いて、各種の条件下で折り曲げ加工部を形成した場合の、カーカスプライ用素材の折り曲げ加工部でのそれの全長の、折り曲げ加工前の全長に対する伸縮比率を測定するとともに、それぞれのカーカスプライ用素材によってカーカスバンドを成型するに当っての端部接合に要する時間を測定した。
ここで、折り曲げ加工部は、図１（ｂ）に示すように、各側部部分の三個所に形成し、全長の測定は、側縁に最も近接した折り曲げ加工部にて行った。
なお、折り曲げ加工は、図５の説明図中の、アルファベット記号に従う各種条件を表１に示すように変化させながら行った。
その結果を表２に示す。
【００１９】
【表１】

Figure 2004050455
【００２０】
【表２】
Figure 2004050455
【００２１】
表２によれば、収縮率が５．８％以上では、カーカスプライ用素材の端部の適正なる接合が不可能になる一方で、それが０．５％では、極めて短時間のうちにその接合を行い得ることが解る。
【００２２】
実施例２
図６に説明図で示すような回転ロールと回転アンビルロールとを用いた場合につき、加工条件を表３に示すように変化させて、実施例１と同様の測定を行ったところ、表４に示す結果を得た。
【００２３】
【表３】
Figure 2004050455
【００２４】
【表４】
Figure 2004050455
【００２５】
表４によれば、＋４．０％までの伸長では、カーカスプライ用素材の端部の接合を適性に行うことができ、−１．０〜＋０．５％の範囲では、接合時間を十分に短縮できることが明らかである。
【００２６】
実施例３
図７に示すような昇降平板と固定アンビルとを用い、表５に示す条件下で折り曲げ加工部を形成した場合の、実施例１と同様の測定結果を表６に示す。
【００２７】
【表５】
Figure 2004050455
【００２８】
【表６】
Figure 2004050455
【００２９】
表６によれば、昇降平板を用いる場合は、回転ロールを用いる場合に比して伸縮変形量が少なく、いずれの加工条件に従っても、カーカスプライ用素材の端部接合をより短時間で行い得ることが解る。
【００３０】
【発明の効果】
以上に述べたところから明らかなように、この発明によれば、カーカスプライ用素材を用いたカーカスバンドの成型を、すぐれた作業能率の下で適正に行うことができ、製品品質および外観をともに有効に向上させることができる。
【図面の簡単な説明】
【図１】この発明に係る方法の実施の形態を示す斜視図である。
【図２】図１にカーカスプライ用素材による、カーカスバンドの成型状態を示す斜視図である。
【図３】折り曲げ加工部の形成態様を例示する図である。
【図４】折り曲げ加工部の他の形成態様を例示する図である。
【図５】実施例１の説明図である。
【図６】実施例２の説明図である。
【図７】実施例３の説明図である。
【図８】従来技術を用いた場合のカーカスバンドの成型状態を示す斜視図である。
【符号の説明】
１　カーカスプライ用素材
２　側部部分
３　折り曲げ加工部
４　成型ドラム
５　カーカスバンド
６，１５　押込刃
７，１０　回転ロール
８，１１，１３　溝
９，１４　固定アンビル
１２　アンビルロール
１６　昇降平板[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for forming a bent portion on a carcass ply material, and in particular, to a bent portion which bends in a direction to be wound around a bead core on each side portion of a carcass ply material provided for forming a carcass band. And a method for forming the same.
[0002]
[Prior art]
For example, a carcass ply material obtained by applying a rubber coating to a plurality of steel cords arranged in parallel with each other, at each side portion wound around the bead core, at one or more locations that bend in a direction to be wound around the bead core. The provision of the bent portion is disclosed in Japanese Patent Application Laid-Open Nos. 2001-246675 and 2002-59492 related to the earlier application of the applicant.
[0003]
[Problems to be solved by the invention]
By the way, when such a bent portion is formed, mainly due to the deformation of the unvulcanized coated rubber that has entered between the mutually adjacent cords, a carcass ply for the bent portion is formed. The entire length of the material often became longer or shorter than its predetermined length before bending.
[0004]
Here, when the entire length of the bent portion is too long, the carcass ply material is wound around a band forming drum to form a carcass band, and as shown in FIG. In the joint portion of the material, the end portions of the bent portion overlap with each other, so it is necessary to cut the overlapping portion by a worker's manual work, and this cutting work reduces the efficiency of molding work. In addition, the cutting operation removes one or more cords extending over the entire width of the carcass ply material, thereby preventing a proper joint at the center portion of the carcass band and creating a gap there. Problems in terms of tire product quality and appearance may occur.
[0005]
On the other hand, if the length of the bent portion becomes too short, as shown in FIG. 8 (b), jointing of the bent portion becomes impossible in forming the carcass band. In addition, there may be problems in product quality and appearance.
[0006]
An object of the present invention is to solve such a problem in the prior art, and an object of the present invention is to form a carcass ply material having bent portions on both sides by forming a drum. For carcass ply, it was possible to form a carcass band by wrapping it over the ends and joining the both ends of the carcass ply material properly over their entire width without lowering the molding work efficiency. An object of the present invention is to provide a method for forming a bent portion on a material.
[0007]
[Means for Solving the Problems]
The method for forming a bent portion on the carcass ply material according to the present invention includes a plurality of cords arranged in parallel with each other, and is wound around a forming drum to form a cylindrical carcass band, in a rubber-coated state or In forming the carcass ply material in a blind weave state, on each side portion wound around the bead core, forming one or more bent portions that bend in a direction to wind around the bead core, The entire length of the bent portion is 0.95 to 1.05 times the entire length before bending, in other words, the entire length of the carcass ply material at the center in the width direction.
[0008]
According to this, the carcass ply material, as described in the prior art, is wound on a forming drum to form a carcass band having a cylindrical shape as a whole. Based on the amount of expansion and contraction within the above range, the carcass ply material can always be properly butted and joined over the entire width including the bent portion, so that the possibility of occurrence of an overlap joint, joint failure, etc. is sufficient. To ensure high product quality and excellent appearance of the tire.
[0009]
Here, in the case where three or more bent portions are formed on each side portion of the carcass ply material, the cross-sectional shape of the bead core is not limited to a square shape when it is circular, but each side portion Can be extended more precisely along the peripheral surface of the bead core, and the side portions can be more firmly held by the bead core.
[0010]
Also preferably, the total length of the carcass ply material at the bent portion is in the range of 0.99 to 1.01 of the total length before the bending process, whereby the carcass ply material at the time of forming the carcass band is formed. Butt joints over the entire width of the end faces can be performed more appropriately without substantially deforming the material.
[0011]
By the way, the bent portion here is formed by a rotating roll having a pushing blade having a substantially V-shaped cross section and a fixed anvil having a groove, and a rotating roll having a pushing blade having a substantially V-shaped cross section. And an anvil roll having a groove, or an elevating flat plate having a pushing blade having a substantially V-shaped cross-section, and a fixed anvil having a groove, and the like. By continuously or intermittently pushing a predetermined position of the side portion of the ply material into the anvil groove with a pushing blade, the bending extends in a direction intersecting with the extending direction of the cord, mostly in a direction substantially orthogonal to the cord. The processed part can be formed easily and as expected.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing an embodiment of the method according to the present invention, in which 1 shows a carcass ply material.
[0013]
Here, the carcass ply material 1 is formed, for example, by arranging a predetermined number of steel cords in parallel and arranging them in parallel and integrally applying a rubber coating to the steel cords. The material 1 is wound around the molding drum over one circumference thereof, and the both ends thereof are joined to form a substantially cylindrical carcass band as a whole.
[0014]
Here, as shown by a virtual line in FIG. 1A, each side portion 2 of the carcass ply material 1 before being formed into such a carcass band is to be wound around a bead core. One or more bent portions extending in a direction intersecting with the extending direction of the cord, for example, a direction perpendicular to the cord, for example, three portions in the drawing are formed.
FIG. 1B shows a state after forming each bent portion 3 on each side portion 2, and each of these bent portions 3 winds the side portion 2 around a bead core. Fold it in the direction.
[0015]
Here also, from 0.95 to 10.5 times the total length L 1 of this way the overall length L 0 of the material 1 at the position of the bending portion 3 is formed by, before the formation of the bending portion 3 Material 1 , More preferably in the range of 0.99 to 1.01 times.
By selecting the total length ratio L 1 / L 0 Thus, the carcass ply material for 1 forming the machining unit 3 folded, as shown in FIG. 2, it on the forming drum 4 having a predetermined outer diameter In forming the carcass band 5 by wrapping around the entire circumference, the respective end faces of the material 1 are properly butted and joined over the entire width of the material 1 without generation of a gap between them and overlapping of both ends. Can be done.
Therefore, the molding operation of the carcass band 5 can be performed efficiently, and excellent product quality and appearance can always be obtained.
[0016]
By the way, as shown in FIG. 3, for example, a bent portion 3 of each side portion 2 includes a rotary roll 7 having a pushing blade 6 having a substantially V-shaped cross section in a radial direction, and also a substantially V-shaped. Using a fixed anvil 9 having a groove 8 forming a groove, a required portion of the side portion 2 is pushed into the groove 8 with the pushing blade 6 and the roll 7 is rotated, and the roll 7 is linearly moved along the groove 8. And can be formed.
[0017]
Further, as shown in FIG. 4A, such a bent portion 3 allows a rotating roll 10 similar to that described above and an anvil roll 12 having a V-groove 11 to cooperate, or As shown in (b), a fixed anvil 14 having a groove 13 similar to the above-described fixed anvil 9 and an elevating plate 16 having a pushing blade 15 having a substantially V-shaped vertical cross section cooperate. It can also be formed by performing the above.
In the former case, each of the rotating roll 10 and the anvil roll 12 is linearly displaced in synchronization with each other with respect to the carcass ply material 1 under the rotation of both, so that the entire length of the material 1 is The bent portion 3 can be formed. In the latter case, the carcass ply material 1 is displaced linearly with respect to the lifting flat plate 16 and the fixed anvil 14 which perform only vertical displacement at a fixed position. The bent portion 3 can be formed over the entire length of the.
[0018]
【Example】
Example 1
Using a rotating roll and a fixed anvil, when forming a bent portion under various conditions, measure the expansion / contraction ratio of the entire length of the carcass ply material in the bent portion to the total length before the bending process. At the same time, the time required for joining the ends in forming a carcass band with each carcass ply material was measured.
Here, as shown in FIG. 1 (b), the bent portions were formed at three places on each side portion, and the total length was measured at the bent portion closest to the side edge.
In addition, the bending process was performed while changing various conditions according to the alphabetic symbols in the explanatory view of FIG. 5 as shown in Table 1.
Table 2 shows the results.
[0019]
[Table 1]
Figure 2004050455
[0020]
[Table 2]
Figure 2004050455
[0021]
According to Table 2, when the shrinkage is 5.8% or more, proper joining of the ends of the carcass ply material becomes impossible, while when the shrinkage is 0.5%, it is extremely short. It can be seen that joining can be performed.
[0022]
Example 2
When the processing conditions were changed as shown in Table 3 for the case where the rotating roll and the rotating anvil roll as illustrated in FIG. 6 were used, the same measurement as in Example 1 was performed. The results shown were obtained.
[0023]
[Table 3]
Figure 2004050455
[0024]
[Table 4]
Figure 2004050455
[0025]
According to Table 4, when the elongation is up to + 4.0%, the end of the carcass ply material can be appropriately joined, and in the range of -1.0 to + 0.5%, the joining time is sufficiently long. Clearly, it can be shortened.
[0026]
Example 3
Table 6 shows the same measurement results as in Example 1 in the case where the bent portion was formed under the conditions shown in Table 5 using the elevating plate and the fixed anvil as shown in FIG.
[0027]
[Table 5]
Figure 2004050455
[0028]
[Table 6]
Figure 2004050455
[0029]
According to Table 6, when the elevating plate is used, the amount of expansion and contraction is smaller than when the rotating roll is used, and the end joining of the carcass ply material can be performed in a shorter time under any processing conditions. I understand.
[0030]
【The invention's effect】
As is clear from the above description, according to the present invention, the molding of the carcass band using the material for the carcass ply can be appropriately performed with excellent work efficiency, and both the product quality and the appearance can be improved. It can be improved effectively.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a method according to the present invention.
FIG. 2 is a perspective view showing a carcass band formed from a carcass ply material in FIG.
FIG. 3 is a diagram illustrating a form of forming a bent portion.
FIG. 4 is a view exemplifying another form of forming a bent portion.
FIG. 5 is an explanatory diagram of the first embodiment.
FIG. 6 is an explanatory diagram of a second embodiment.
FIG. 7 is an explanatory diagram of a third embodiment.
FIG. 8 is a perspective view showing a molded state of a carcass band when a conventional technique is used.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Material for carcass ply 2 Side part 3 Bending part 4 Molding drum 5 Carcass band 6,15 Push blade 7,10 Rotating roll 8,11,13 Groove 9,14 Fixed anvil 12 Anvil roll 16 Elevating plate

Claims (6)

相互に並列配置された複数本のコードを含み、成形ドラム上に巻き付けられて円筒状のカーカスバンドを構成するカーカスプライ用素材の、ビードコアの周りに巻き回される各側部部分に、ビードコアに巻き付く向きに折れ曲がる一個所以上の折り曲げ加工部を形成するに当り、
カーカスプライ用素材の折り曲げ加工部でのそれの全長を、折り曲げ加工前の全長の０．９５〜１．０５倍の範囲とするカーカスプライ用素材への折り曲げ部形成方法。The carcass ply material, which includes a plurality of cords arranged in parallel with each other and is wound on a forming drum to form a cylindrical carcass band, has a bead core on each side portion wound around the bead core. In forming one or more bent parts that bend in the winding direction,
A method for forming a bent portion on a carcass ply material, in which the total length of the carcass ply material at the bent portion is 0.95 to 1.05 times the total length before the bending process. カーカスプライ用素材の各側部部分に三個所以上の折り曲げ加工部を形成する請求項１に記載のカーカスプライ用素材への折り曲げ部形成方法。The method for forming a bent portion on a carcass ply material according to claim 1, wherein three or more bent portions are formed on each side portion of the carcass ply material. カーカスプライ用素材の折り曲げ加工部でのそれの全長を、曲げ加工前の全長の０．９９〜１．０１倍の範囲とする請求項１もしくは２に記載のカーカスプライ用素材への折り曲げ部形成方法。The formation of a bent portion in the carcass ply material according to claim 1 or 2, wherein the entire length of the carcass ply material at the bent portion is 0.99 to 1.01 times the entire length before the bending process. Method. 断面形状がほぼＶ字状の押込刃を有する回転ロールと、溝付きの固定アンビルとによって折り曲げ加工部を形成する請求項１〜３のいづれかに記載のカーカスプライ用素材への折り曲げ部形成方法。The method for forming a bent portion on a carcass ply material according to any one of claims 1 to 3, wherein the bent portion is formed by a rotating roll having a pushing blade having a substantially V-shaped cross section and a fixed anvil with a groove. 断面形状がほぼＶ字状の押込刃を有する回転ロールと、溝付きのアンビルロールとによって折り曲げ加工部を形成する請求項１〜３のいづれかに記載のカーカスプライ用素材への折り曲げ部形成方法。The method for forming a bent portion on a carcass ply material according to any one of claims 1 to 3, wherein the bent portion is formed by a rotating roll having a pressing blade having a substantially V-shaped cross section and a grooved anvil roll. 断面形状がほぼＶ字状の押込刃を有する昇降平板と、溝付きの固定アンビルとによって折り曲げ加工部を形成する請求項１〜３のいづれかに記載のカーカスプライ用素材への折り曲げ部形成方法。The method for forming a bent portion on a material for a carcass ply according to any one of claims 1 to 3, wherein the bent portion is formed by a lifting flat plate having a pushing blade having a substantially V-shaped cross section and a fixed anvil with a groove.
JP2002207666A 2002-07-17 2002-07-17 Method for forming bending part to material for carcass ply Pending JP2004050455A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008044168A (en) * 2006-08-11 2008-02-28 Bridgestone Corp Pre-straining method of carcass ply and manufacturing method of pneumatic tire
JP2008188856A (en) * 2007-02-05 2008-08-21 Bridgestone Corp Manufacturing method of pneumatic tire

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008044168A (en) * 2006-08-11 2008-02-28 Bridgestone Corp Pre-straining method of carcass ply and manufacturing method of pneumatic tire
JP2008188856A (en) * 2007-02-05 2008-08-21 Bridgestone Corp Manufacturing method of pneumatic tire

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