JP7159715B2 - Manufacturing method of tire vulcanizing bladder - Google Patents

Manufacturing method of tire vulcanizing bladder Download PDF

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JP7159715B2
JP7159715B2 JP2018167998A JP2018167998A JP7159715B2 JP 7159715 B2 JP7159715 B2 JP 7159715B2 JP 2018167998 A JP2018167998 A JP 2018167998A JP 2018167998 A JP2018167998 A JP 2018167998A JP 7159715 B2 JP7159715 B2 JP 7159715B2
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tire vulcanizing
vulcanizing bladder
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誠 光真坊
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Yokohama Rubber Co Ltd
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本発明は、プレス成型によるタイヤ加硫用ブラダーの製造方法に関し、更に詳しくは、不均一なゴム流れを抑制し、タイヤ加硫用ブラダーの品質を高めることを可能にしたタイヤ加硫用ブラダーの製造方法に関する。 The present invention relates to a method for producing a tire vulcanizing bladder by press molding, and more particularly, to a tire vulcanizing bladder that can suppress uneven rubber flow and improve the quality of the tire vulcanizing bladder. It relates to a manufacturing method.

タイヤ加硫用ブラダーを製造する方法として、プレス成型による加硫が広く行われている。このプレス成型では、タイヤ加硫用ブラダーの外表面を成形する外型と、タイヤ加硫用ブラダーの内表面を成形するコアとを有し、外型が下型と上型とに分割された金型を用い、下型と上型との間に形成される円環状の材料配置空間に未加硫ゴムを所定の分量となるように配置し、その未加硫ゴムを閉型時の圧縮力に基づいて外型とコアとの間のキャビティに導入し、該キャビティの全域に未加硫ゴムが充填された状態で加硫を行う。 Vulcanization by press molding is widely used as a method of manufacturing tire vulcanizing bladders. This press molding has an outer mold for molding the outer surface of the tire vulcanizing bladder and a core for molding the inner surface of the tire vulcanizing bladder, and the outer mold is divided into a lower mold and an upper mold. Using a mold, unvulcanized rubber is placed in a predetermined amount in the annular material placement space formed between the lower mold and the upper mold, and the unvulcanized rubber is compressed when the mold is closed. The unvulcanized rubber is introduced into the cavity between the outer mold and the core based on force, and vulcanization is performed in a state in which the entire cavity is filled with the unvulcanized rubber.

このようなプレス成型においては、材料配置空間にセットされる未加硫ゴムの形状や位置がブラダーの出来栄えに大きく影響する。例えば、タイヤ加硫用ブラダーをプレス成型により製造する場合、下型と上型との間の材料配置空間に未加硫ゴムからなる帯状体を円環状に湾曲させて端部同士を繋ぎ合せた状態で配置することが行われるが、その帯状体の繋ぎ部分がプレス中に外れると不均一なゴム流れを生じ、タイヤ加硫用ブラダーの品質が低下することになる。 In such press molding, the shape and position of the unvulcanized rubber set in the material arrangement space greatly affect the quality of the bladder. For example, when a bladder for tire vulcanization is manufactured by press molding, a belt-like body made of unvulcanized rubber is bent into an annular shape in the material arrangement space between the lower mold and the upper mold, and the ends are joined together. However, if the connecting portion of the band is dislodged during pressing, uneven rubber flow will occur and the quality of the tire vulcanizing bladder will be degraded.

これに対して、未加硫ゴムからなる帯状体の繋ぎ部分が外れるのを防止するために帯状体の両端部の接合面を該帯状体の長手方向に対して傾斜させることが提案されている（例えば、特許文献１参照）。しかしながら、帯状体の両端部の接合面を単に傾斜させるだけでは、帯状体の繋ぎ部分の外れを十分に抑制することができない。 On the other hand, it has been proposed to incline the joining surfaces of both ends of the strip with respect to the longitudinal direction of the strip in order to prevent the connecting portions of the strip made of unvulcanized rubber from coming off. (See Patent Document 1, for example). However, simply inclining the joining surfaces at both ends of the strip cannot sufficiently prevent the joining portion of the strip from coming off.

特開２０１８－８４４１号公報Japanese Unexamined Patent Application Publication No. 2018-8441

本発明の目的は、不均一なゴム流れを抑制し、タイヤ加硫用ブラダーの品質を高めることを可能にしたタイヤ加硫用ブラダーの製造方法を提供することにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing a tire vulcanizing bladder that can suppress uneven rubber flow and improve the quality of the tire vulcanizing bladder.

上記目的を達成するための本発明のタイヤ加硫用ブラダーの製造方法（第１方法）は、タイヤ加硫用ブラダーの外表面を成形する外型と、前記タイヤ加硫用ブラダーの内表面を成形するコアとを有し、前記外型が下型と上型とに分割された金型を用い、前記下型と前記上型との間に形成される円環状の材料配置空間に未加硫ゴムを配置し、該未加硫ゴムを閉型時の圧縮力に基づいて前記外型と前記コアとの間のキャビティに導入するようにしたタイヤ加硫用ブラダーの製造方法において、
前記未加硫ゴムからなる帯状体を円環状に湾曲させて端部同士を繋ぎ合せた状態で前記材料配置空間に配置すると共に、前記帯状体の各端部に少なくとも１つの曲面又は複数の平面を含む３次元構造の接合面を形成し、該接合面の接触面積を前記帯状体の長手方向に対して垂直方向の断面積よりも大きくし、前記帯状体の一方の端部の接合面に少なくとも１つの突起を設け、前記帯状体の他方の端部の接合面に少なくとも１つの凹部を設け、前記突起と前記凹部とが互いに噛み合う形状を有することを特徴とするものである。 A method for manufacturing a tire vulcanizing bladder (first method) for achieving the above object comprises an outer mold for molding an outer surface of a tire vulcanizing bladder and an inner surface of the tire vulcanizing bladder. A mold having a core to be molded and having the outer mold divided into a lower mold and an upper mold is used. In a method for producing a tire vulcanizing bladder, wherein vulcanized rubber is placed and the unvulcanized rubber is introduced into the cavity between the outer mold and the core based on the compressive force when the mold is closed,
A strip made of the unvulcanized rubber is curved in an annular shape and placed in the material placement space with the ends joined together, and each end of the strip has at least one curved surface or a plurality of flat surfaces. forming a joint surface having a three-dimensional structure including At least one protrusion is provided, at least one recess is provided in the joint surface of the other end of the strip, and the protrusion and the recess are shaped so as to mesh with each other .

本発明の第１方法では、未加硫ゴムからなる帯状体を円環状に湾曲させて端部同士を繋ぎ合せた状態で材料配置空間に配置するにあたって、帯状体の各端部に少なくとも１つの曲面又は複数の平面を含む３次元構造の接合面を形成し、該接合面の接触面積を帯状体の長手方向に対して垂直方向の断面積よりも大きくすることにより、帯状体の繋ぎ部分がプレス中に外れることを効果的に防止することができる。その結果、不均一なゴム流れを効果的に抑制し、タイヤ加硫用ブラダーの品質を高めることができる。 In the first method of the present invention, when a strip made of unvulcanized rubber is curved into an annular shape and the ends are joined together and arranged in the material placement space, at least one at each end of the strip. By forming a joint surface having a three-dimensional structure including a curved surface or a plurality of flat surfaces, and making the contact area of the joint surface larger than the cross-sectional area in the direction perpendicular to the longitudinal direction of the strip, the joining portion of the strip is formed. Disengagement during pressing can be effectively prevented. As a result, uneven rubber flow can be effectively suppressed, and the quality of the tire vulcanizing bladder can be improved.

本発明の第１方法において、帯状体の長手方向に対して垂直方向の断面積に対する接合面の接触面積の比は２．４以上であることが好ましい。このように接合面の接触面積の比を大きくすることにより、帯状体の繋ぎ部分の外れを効果的に防止することができる。 In the first method of the present invention, it is preferable that the ratio of the contact area of the joint surface to the cross-sectional area perpendicular to the longitudinal direction of the strip is 2.4 or more. By increasing the ratio of the contact areas of the joint surfaces in this way, it is possible to effectively prevent the connecting portion of the strip from coming off.

また、帯状体の一方の端部の接合面には少なくとも１つの突起を設け、帯状体の他方の端部の接合面には少なくとも１つの凹部を設け、これら突起と凹部とが互いに噛み合う形状を有することが好ましい。このような形状を採用することにより、帯状体の繋ぎ部分の外れをより確実に防止することができる。 At least one protrusion is provided on the joint surface of one end of the strip, and at least one recess is provided on the joint surface of the other end of the strip, and these protrusions and recesses are engaged with each other. It is preferable to have By adopting such a shape, it is possible to more reliably prevent the connecting portion of the strip from coming off.

本発明に係るタイヤ加硫用ブラダーの製造方法で使用される金型（半開き状態）を示す子午線断面図である。FIG. 2 is a meridional cross-sectional view showing a mold (half-opened state) used in the method for manufacturing a tire vulcanizing bladder according to the present invention; 本発明に係るタイヤ加硫用ブラダーの製造方法で使用される金型（閉型状態）を示す子午線断面図である。FIG. 2 is a meridional cross-sectional view showing a mold (closed state) used in the method for manufacturing a tire vulcanizing bladder according to the present invention; 本発明に係るタイヤ加硫用ブラダーの製造方法で使用される未加硫ゴムからなる帯状体を示す斜視図である。1 is a perspective view showing a belt-like body made of unvulcanized rubber used in the method of manufacturing a tire vulcanizing bladder according to the present invention. FIG. 図３の帯状体の両端部を示す斜視図である。4 is a perspective view showing both ends of the strip of FIG. 3; FIG. 帯状体の両端部の変形例を示す斜視図である。It is a perspective view which shows the modification of the both ends of a strip|belt-shaped body. 帯状体の両端部の更なる変形例を示す斜視図である。FIG. 11 is a perspective view showing a further modified example of both ends of the strip; 本発明に係るタイヤ加硫用ブラダーの製造方法で使用される未加硫ゴムからなる他の帯状体（参考例）を示す斜視図である。Fig. 10 is a perspective view showing another belt-shaped body (reference example) made of unvulcanized rubber used in the method of manufacturing a tire vulcanizing bladder according to the present invention. 本発明で得られる円筒状のタイヤ加硫用ブラダーを示す子午線断面図である。1 is a meridional cross-sectional view showing a cylindrical tire vulcanizing bladder obtained by the present invention. FIG. 本発明で得られる片端が閉じた袋状のタイヤ加硫用ブラダーを示す子午線断面図である。1 is a meridional cross-sectional view showing a bag-like tire vulcanizing bladder closed at one end obtained by the present invention. FIG.

以下、本発明の構成について添付の図面を参照しながら詳細に説明する。図１及び図２は本発明に係るタイヤ加硫用ブラダーの製造方法で使用される金型を示し、図３及び図４は本発明に係るタイヤ加硫用ブラダーの製造方法（第１方法）で使用される未加硫ゴムからなる帯状体を示すものである。 Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 show a mold used in the method for manufacturing a tire vulcanizing bladder according to the present invention, and FIGS. 3 and 4 show a method for manufacturing a tire vulcanizing bladder according to the present invention (first method). It shows a strip made of unvulcanized rubber used in.

図１及び図２に示すように、金型１は、円筒状をなすタイヤ加硫用ブラダー１０の外表面を成形する外型２と、タイヤ加硫用ブラダー１０の内表面を成形するコア３とを有し、外型２が下型４と上型５とに分割されている。コア３、下型４及び上型５はタイヤ加硫用ブラダー１０の中心軸方向に沿って相対的に移動自在に構成されている。 As shown in FIGS. 1 and 2, the mold 1 includes an outer mold 2 for molding the outer surface of a cylindrical tire vulcanizing bladder 10 and a core 3 for molding the inner surface of the tire vulcanizing bladder 10. and the outer mold 2 is divided into a lower mold 4 and an upper mold 5 . The core 3 , the lower mold 4 and the upper mold 5 are configured to be relatively movable along the central axis direction of the tire vulcanizing bladder 10 .

図１に示すような金型１の半開き状態において、下型４と上型５との間には円環状の材料配置空間６が形成される。つまり、下型４が材料配置空間６の底面と外周面を形成し、上型５が材料配置空間６の上面を形成している。そのため、材料配置空間６に配置された未加硫ゴムＲは、上型５を下型４に向かって加圧した際に、その圧縮力に基づいて外型２とコア３との間のキャビティ７に導入されることになる。また、下型４及び上型５には、その合わせ面の上端部及び下端部においてキャビティ７に連通する余剰ゴム受け入れ部９が形成されており、これら余剰ゴム受け入れ部９がキャビティ７から溢れた余剰ゴムを収容するようになっている。 In the half-open state of the mold 1 as shown in FIG. 1, an annular material arrangement space 6 is formed between the lower mold 4 and the upper mold 5. As shown in FIG. That is, the lower mold 4 forms the bottom surface and outer peripheral surface of the material arrangement space 6 , and the upper mold 5 forms the upper surface of the material arrangement space 6 . Therefore, when the upper mold 5 is pressed toward the lower mold 4, the unvulcanized rubber R arranged in the material arrangement space 6 is compressed into the cavity between the outer mold 2 and the core 3 based on the compressive force. It will be introduced in 7. In addition, surplus rubber receiving portions 9 communicating with the cavity 7 are formed at the upper and lower end portions of the mating surfaces of the lower mold 4 and the upper mold 5, and the surplus rubber receiving portions 9 overflow the cavity 7. It is designed to contain surplus rubber.

上述のような金型１を用いてタイヤ加硫用ブラダー１０を製造する場合、先ず、図３に示すように、未加硫ゴムＲからなる帯状体１１を円環状に湾曲させて端部１１Ａ，１１Ａ同士を繋ぎ合せた状態で材料配置空間６に配置する。ここで、帯状体１１の各端部１１Ａには、少なくとも１つの曲面又は複数の平面を含む３次元構造の接合面１１Ｂが形成されている。そして、各接合面１１Ｂの接触面積をＸ（ｍｍ2）とし、帯状体１１の長手方向に対して垂直となる断面における断面積をＹ（ｍｍ2）としたとき、接触面積Ｘが断面積Ｙよりも大きくなっている。つまり、比Ｘ／Ｙが１．０よりも大きくなっている。なお、帯状体１１の端部１１Ａ，１１Ａ同士の繋ぎ合せ作業は、金型１の外部で事前に行っても良く、或いは、金型１の材料配置空間６において行っても良い。 When manufacturing the tire vulcanizing bladder 10 using the mold 1 as described above, first, as shown in FIG. , 11A are arranged in the material arrangement space 6 in a state where they are connected to each other. Here, each end portion 11A of the belt-shaped body 11 is formed with a joint surface 11B having a three-dimensional structure including at least one curved surface or a plurality of flat surfaces. Then, when the contact area of each joint surface 11B is X (mm 2 ) and the cross-sectional area of the cross section perpendicular to the longitudinal direction of the strip 11 is Y (mm 2 ), the contact area X is the cross-sectional area Y is larger than That is, the ratio X/Y is greater than 1.0. Note that the joining work of the ends 11A, 11A of the belt-shaped body 11 may be performed outside the mold 1 in advance, or may be performed in the material arrangement space 6 of the mold 1.

未加硫ゴムＲからなる帯状体１１を材料配置空間６に配置した後、上型５を下型４に向かって加圧して金型１を閉じる。これにより、帯状体１１を構成する未加硫ゴムＲが閉型時の圧縮力に基づいて外型２とコア３との間のキャビティ７に導入される。このようにして金型１を閉じた状態で金型１を加熱して加硫を行うことにより、キャビティ７内に加硫済みのタイヤ加硫用ブラダー１０を成形することができる。 After the strip 11 made of the unvulcanized rubber R is arranged in the material arrangement space 6, the upper mold 5 is pressed toward the lower mold 4 to close the mold 1.例文帳に追加As a result, the unvulcanized rubber R forming the band-shaped body 11 is introduced into the cavity 7 between the outer mold 2 and the core 3 based on the compressive force when the mold is closed. By performing vulcanization by heating the mold 1 while the mold 1 is closed in this way, the vulcanized tire vulcanizing bladder 10 can be formed in the cavity 7 .

上述したタイヤ加硫用ブラダー１０の製造方法では、未加硫ゴムＲからなる帯状体１１を円環状に湾曲させて端部１１Ａ，１１Ａ同士を繋ぎ合せた状態で材料配置空間６に配置するにあたって、帯状体１１の各端部１１Ａに少なくとも１つの曲面又は複数の平面を含む３次元構造の接合面１１Ｂを形成し、該接合面１１Ｂの接触面積Ｘを帯状体１１の長手方向に対して垂直方向の断面積Ｙよりも大きくしているので、帯状体１１の繋ぎ部分がプレス中に外れることを効果的に防止することができる。その結果、キャビティ７における不均一なゴム流れを効果的に抑制し、タイヤ加硫用ブラダー１０の品質を高めることができる。 In the above-described method for manufacturing the tire vulcanizing bladder 10, the belt-shaped body 11 made of the unvulcanized rubber R is bent into an annular shape and arranged in the material placement space 6 with the ends 11A and 11A joined together. , a joint surface 11B having a three-dimensional structure including at least one curved surface or a plurality of flat surfaces is formed at each end 11A of the strip 11, and the contact area X of the joint surface 11B is perpendicular to the longitudinal direction of the strip 11. Since it is made larger than the cross-sectional area Y in the direction, it is possible to effectively prevent the connecting portion of the band-shaped body 11 from coming off during pressing. As a result, uneven rubber flow in the cavity 7 can be effectively suppressed, and the quality of the tire vulcanizing bladder 10 can be improved.

上述したタイヤ加硫用ブラダー１０の製造方法において、帯状体１１の長手方向に対して垂直方向の断面積Ｙに対する接合面１１Ｂの接触面積Ｘの比Ｘ／Ｙは１．０超であることが必要であるが、好ましくは１．１以上、より好ましくは１．４以上、更に好ましくは２．４以上とする。このように接合面１１Ｂの接触面積の比を大きくすることにより、帯状体１１の繋ぎ部分の外れを効果的に防止することができる。比Ｘ／Ｙの上限値は特に限定されるものではないが、実用上、その上限値は５とすれば良い。 In the method for manufacturing the tire vulcanizing bladder 10 described above, the ratio X/Y of the contact area X of the joint surface 11B to the cross-sectional area Y in the direction perpendicular to the longitudinal direction of the strip 11 is more than 1.0. Although necessary, it is preferably 1.1 or more, more preferably 1.4 or more, and still more preferably 2.4 or more. By increasing the ratio of the contact areas of the joint surfaces 11B in this manner, it is possible to effectively prevent the connecting portion of the band-shaped body 11 from coming off. Although the upper limit of the ratio X/Y is not particularly limited, the upper limit may be set to 5 in practice.

上述したタイヤ加硫用ブラダー１０の製造方法において、図４に示すように、帯状体１１の一方の端部１１Ａの接合面１１Ｂには少なくとも１つの突起１１Ｃを設け、帯状体１１の他方の端部１１Ａの接合面１１Ｂには少なくとも１つの凹部１１Ｄを設け、これら突起１１Ｃと凹部１１Ｄとが互いに噛み合う形状を有することが好ましい。図４の例では、帯状体１１の各端部１１Ａの接合面１１Ｂに帯状体１１の長手方向に対して直交する方向に突き出した２つの突起１１Ｃとそれらを受容する２つの凹部１１Ｄとが形成されている。このような形状を採用することにより、帯状体１１の繋ぎ部分の外れをより確実に防止することができる。 In the manufacturing method of the tire vulcanizing bladder 10 described above, as shown in FIG. It is preferable that at least one concave portion 11D is provided on the joint surface 11B of the portion 11A, and that the projection 11C and the concave portion 11D have a shape that meshes with each other. In the example of FIG. 4, two projections 11C protruding in a direction orthogonal to the longitudinal direction of the strip 11 and two recesses 11D for receiving them are formed on the joint surface 11B of each end 11A of the strip 11. It is By adopting such a shape, it is possible to more reliably prevent the connecting portion of the band-shaped body 11 from coming off.

図５及び図６はそれぞれ帯状体の両端部の変形例を示すものである。図５及び図６において、帯状体１１の一方の端部１１Ａの接合面１１Ｂには帯状体１１の長手方向に突き出した１つの突起１１Ｃが形成され、帯状体１１の他方の端部１１Ａの接合面１１Ｂにはそれを受容する１つの凹部１１Ｄが形成されている。また、図４及び図５では接合面１１Ｂが互いに交差する複数の平面から構成されているのに対して、図６では接合面１１Ｂが少なくとも１つの曲面を含んでいる。勿論、接合面１１Ｂは少なくとも１つの曲面のみで構成されていても良い。 5 and 6 each show a modification of both ends of the strip. 5 and 6, one projection 11C protruding in the longitudinal direction of the belt-shaped body 11 is formed on the bonding surface 11B of one end 11A of the belt-shaped body 11, and the other end 11A of the belt-shaped body 11 is bonded. A recess 11D is formed in the surface 11B to receive it. 4 and 5, the joint surface 11B is composed of a plurality of intersecting planes, whereas in FIG. 6, the joint surface 11B includes at least one curved surface. Of course, the joint surface 11B may be composed of only at least one curved surface.

図７は本発明に係るタイヤ加硫用ブラダーの製造方法（第２方法）で使用される未加硫ゴムからなる他の帯状体を示すものである。上述した繋ぎ合せタイプの帯状体１１に代えて、積層タイプの帯状体１２を使用することも可能である。この場合、タイヤ加硫用ブラダー１０の外表面を成形する外型２と、タイヤ加硫用ブラダー１０の内表面を成形するコア３とを有し、外型２が下型４と上型５とに分割された金型１（図１及び図２参照）を用い、下型４と上型５との間に形成される円環状の材料配置空間６に未加硫ゴムＲを配置し、該未加硫ゴムＲを閉型時の圧縮力に基づいて外型２とコア３との間のキャビティ７に導入するようにしたタイヤ加硫用ブラダーの製造方法において、図７に示すように、未加硫ゴムＲからなる帯状体１２を円環状に複数周巻回させて積層した状態で材料配置空間６に配置する。 FIG. 7 shows another belt-like body made of unvulcanized rubber used in the method (second method) for producing a tire vulcanizing bladder according to the present invention. It is also possible to use a laminated type strip 12 instead of the above-described spliced type strip 11 . In this case, it has an outer mold 2 for molding the outer surface of the tire vulcanizing bladder 10 and a core 3 for molding the inner surface of the tire vulcanizing bladder 10, the outer mold 2 being a lower mold 4 and an upper mold 5. Using a mold 1 (see FIGS. 1 and 2) divided into and, placing an unvulcanized rubber R in an annular material placement space 6 formed between a lower mold 4 and an upper mold 5, In a method for manufacturing a tire vulcanizing bladder in which the unvulcanized rubber R is introduced into the cavity 7 between the outer mold 2 and the core 3 based on the compressive force when the mold is closed, as shown in FIG. , a belt-like body 12 made of unvulcanized rubber R is arranged in the material arrangement space 6 in a state in which it is wound in a plurality of annular turns and laminated.

この場合も、未加硫ゴムＲからなる帯状体１２を円環状に複数周巻回させて積層した状態で材料配置空間６に配置することにより、帯状体１２の層間でずれが生じ難くなるため、帯状体１２の繋ぎ部分がプレス中に外れることを効果的に防止することができる。その結果、キャビティ７における不均一なゴム流れを効果的に抑制し、タイヤ加硫用ブラダーの品質を高めることができる。 In this case as well, by arranging the belt-shaped body 12 made of the unvulcanized rubber R in the material placement space 6 in a state in which the belt-shaped body 12 is wound in a plurality of annular turns and laminated, it becomes difficult for the belt-shaped body 12 to be misaligned between the layers. , it is possible to effectively prevent the connecting portion of the band-shaped body 12 from coming off during pressing. As a result, uneven rubber flow in the cavity 7 can be effectively suppressed, and the quality of the tire vulcanizing bladder can be improved.

未加硫ゴムＲからなる帯状体１２を円環状に複数周巻回させて積層する場合、周上の質量分布を均一化するために、帯状体１２の厚さを０．５ｍｍ～５ｍｍとし、その周回数を１０回～１００回とすることが好ましい。これにより、積層時の作業性を良好に維持しながら、帯状体１２の巻き始め端部と巻き終わり端部との位置関係に起因する質量の不均一を低減することができる。また、帯状体１２の巻き始め端部と巻き終わり端部との周方向の重なり長さは帯状体１２の周長５％以下であることが好ましい。これにより、帯状体１２の巻き始め端部と巻き終わり端部との位置関係に起因する質量の不均一を低減することができる。 When the belt-shaped body 12 made of unvulcanized rubber R is wound and laminated in a plurality of circles, the thickness of the belt-shaped body 12 is set to 0.5 mm to 5 mm in order to equalize the mass distribution on the circumference. It is preferable that the number of laps is 10 to 100 times. As a result, it is possible to reduce non-uniformity in mass due to the positional relationship between the winding start end and the winding end of the belt-like body 12 while maintaining good workability during lamination. In addition, it is preferable that the overlapping length in the circumferential direction between the winding start end portion and the winding end portion of the belt-shaped body 12 is 5% or less of the circumferential length of the belt-shaped body 12 . As a result, it is possible to reduce unevenness in mass caused by the positional relationship between the winding start end and the winding end of the belt-shaped body 12 .

上述したタイヤ加硫用ブラダー１０の製造方法によれば、図８に示すように、円筒状をなすタイヤ加硫用ブラダー１０を得ることができる。同様の製造方法により、図９に示すように、片端が閉じた袋状をなすタイヤ加硫用ブラダー１０を得ることも可能である。いずれの場合も、不均一なゴム流れを効果的に抑制し、タイヤ加硫用ブラダー１０の品質を高めることができる。 According to the manufacturing method of the tire vulcanizing bladder 10 described above, a cylindrical tire vulcanizing bladder 10 can be obtained as shown in FIG. By a similar manufacturing method, it is also possible to obtain a bag-like tire vulcanizing bladder 10 with one end closed, as shown in FIG. In either case, uneven rubber flow can be effectively suppressed, and the quality of the tire vulcanizing bladder 10 can be improved.

タイヤ加硫用ブラダーの外表面を成形する外型と、タイヤ加硫用ブラダーの内表面を成形するコアとを有し、外型が下型と上型とに分割された金型を用い、下型と上型との間に形成される円環状の材料配置空間に未加硫ゴムを配置し、該未加硫ゴムを閉型時の圧縮力に基づいて外型とコアとの間のキャビティに導入するようにしたタイヤ加硫用ブラダーの製造方法において、未加硫ゴムを材料配置空間に装填する際の条件を表１のように種々異ならせて加硫（実施例１～４及び比較例１～２）を行った。なお、本明細書において、実施例４は参考例である。 Using a mold having an outer mold for molding the outer surface of the tire vulcanizing bladder and a core for molding the inner surface of the tire vulcanizing bladder, the outer mold being divided into a lower mold and an upper mold, An unvulcanized rubber is placed in an annular material arrangement space formed between the lower mold and the upper mold, and the unvulcanized rubber is moved between the outer mold and the core based on the compressive force when the mold is closed. In the method of manufacturing a tire vulcanizing bladder that is introduced into a cavity, vulcanization is performed by varying the conditions for loading unvulcanized rubber into the material arrangement space as shown in Table 1 (Examples 1 to 4 and Comparative Examples 1 and 2) were performed. In addition, in this specification, Example 4 is a reference example.

実施例１～３：
未加硫ゴムからなる帯状体を円環状に湾曲させて端部同士を繋ぎ合せた状態で材料配置空間に配置した。その際、帯状体の各端部に少なくとも１つの曲面又は複数の平面を含む３次元構造の接合面を形成し、該接合面の接触面積Ｘと帯状体の長手方向に対して垂直方向の断面積Ｙとの比Ｘ／Ｙを表１のように設定した。 Examples 1-3:
A belt-shaped body made of unvulcanized rubber was curved in an annular shape and arranged in a material arrangement space with the ends joined together. At that time, a joint surface having a three-dimensional structure including at least one curved surface or a plurality of flat surfaces is formed at each end of the strip, and the contact area X of the joint surface and the cross section perpendicular to the longitudinal direction of the strip A ratio X/Y to the area Y was set as shown in Table 1.

実施例４：
未加硫ゴムからなる帯状体を円環状に複数周巻回させて積層した状態で材料配置空間に配置した。その際、帯状体の厚さを１ｍｍとし、その周回数を５０回とした。 Example 4:
A belt-like body made of unvulcanized rubber was arranged in the material arrangement space in a state in which it was wound around a plurality of circular rings and laminated. At that time, the thickness of the strip was set to 1 mm, and the number of turns was set to 50 times.

比較例１～２：
未加硫ゴムからなる帯状体を円環状に湾曲させて端部同士を繋ぎ合せた状態で材料配置空間に配置した。その際、帯状体の各端部に単一の平面からなる接合面を形成し、該接合面の接触面積Ｘと帯状体の長手方向に対して垂直方向の断面積Ｙとの比Ｘ／Ｙを表１のように設定した。 Comparative Examples 1-2:
A belt-shaped body made of unvulcanized rubber was curved in an annular shape and arranged in a material arrangement space with the ends joined together. At that time, a joint surface consisting of a single plane is formed at each end of the strip, and the ratio X/Y of the contact area X of the joint surface and the cross-sectional area Y perpendicular to the longitudinal direction of the strip was set as shown in Table 1.

上述した実施例１～４及び比較例１～２に係る方法で得られたタイヤ加硫用ブラダーについて、下記の評価方法により、ブラダーの不良本数を評価し、その結果を表１に併せて示した。 Regarding the tire vulcanizing bladders obtained by the methods according to Examples 1 to 4 and Comparative Examples 1 and 2 described above, the number of defective bladders was evaluated by the following evaluation method, and the results are also shown in Table 1. rice field.

ブラダーの不良本数：
実施例１～４及び比較例１～２の各方法により５０本のブラダーを加硫成形し、繋ぎ部分の外れに起因する不良が認められるブラダーの本数を調べた。ここで、繋ぎ部分の外れに起因する不良とは、繋ぎ部分の外れに起因して繋ぎ部分があった箇所に穴が開いた場合（外観により判断可能）、繋ぎ部分が一旦外れて再び繋がった際にエアを巻き込んで繋ぎ部分が膨らんだ状態になった場合（外観により判断可能）、及び、外観では判断できないものの品質の低下によりタイヤ加硫工程での管理寿命の１０％未満で穴が開いてしまった場合を含む。 Number of defective bladders:
Fifty bladders were vulcanized and molded by the methods of Examples 1 to 4 and Comparative Examples 1 and 2, and the number of bladders in which defects due to disengagement of the connecting portions were found was examined. Here, the defect caused by the detachment of the joint part means that when the joint part is detached and a hole is opened in the place where the joint part was (can be judged by appearance), the joint part is once detached and then reconnected. When the connecting part becomes inflated due to air entrainment (can be judged by appearance), and although it cannot be judged by appearance, due to deterioration in quality, a hole opens at less than 10% of the controlled life in the tire vulcanization process. Including cases where

Figure 0007159715000001
Figure 0007159715000001

表１から判るように、実施例１～４のタイヤ加硫用ブラダーの製造方法では、比較例１～２との対比において、不均一なゴム流れが効果的に抑制され、タイヤ加硫用ブラダーの品質が改善されるため、ブラダーの不良本数が削減されていた。 As can be seen from Table 1, in the tire vulcanizing bladder manufacturing methods of Examples 1 to 4, uneven rubber flow was effectively suppressed in comparison with Comparative Examples 1 and 2, and the tire vulcanizing bladder The number of defective bladders was reduced because the quality of the bladders was improved.

１ 金型
２ 外型
３ コア
４ 下型
５ 上型
６ 材料配置空間
７ キャビティ
１０ タイヤ加硫用ブラダー
１１ 帯状体（繋ぎ合せタイプ）
１２ 帯状体（積層タイプ）
Ｒ 未加硫ゴム REFERENCE SIGNS LIST 1 mold 2 outer mold 3 core 4 lower mold 5 upper mold 6 material arrangement space 7 cavity 10 tire vulcanizing bladder 11 strip (connecting type)
12 strip (laminated type)
R unvulcanized rubber

Claims (2)

タイヤ加硫用ブラダーの外表面を成形する外型と、前記タイヤ加硫用ブラダーの内表面を成形するコアとを有し、前記外型が下型と上型とに分割された金型を用い、前記下型と前記上型との間に形成される円環状の材料配置空間に未加硫ゴムを配置し、該未加硫ゴムを閉型時の圧縮力に基づいて前記外型と前記コアとの間のキャビティに導入するようにしたタイヤ加硫用ブラダーの製造方法において、
前記未加硫ゴムからなる帯状体を円環状に湾曲させて端部同士を繋ぎ合せた状態で前記材料配置空間に配置すると共に、前記帯状体の各端部に少なくとも１つの曲面又は複数の平面を含む３次元構造の接合面を形成し、該接合面の接触面積を前記帯状体の長手方向に対して垂直方向の断面積よりも大きくし、前記帯状体の一方の端部の接合面に少なくとも１つの突起を設け、前記帯状体の他方の端部の接合面に少なくとも１つの凹部を設け、前記突起と前記凹部とが互いに噛み合う形状を有することを特徴とするタイヤ加硫用ブラダーの製造方法。 A mold having an outer mold for molding the outer surface of a tire vulcanizing bladder and a core for molding the inner surface of the tire vulcanizing bladder, wherein the outer mold is divided into a lower mold and an upper mold. Using, unvulcanized rubber is placed in an annular material placement space formed between the lower mold and the upper mold, and the unvulcanized rubber is pressed against the outer mold based on the compressive force when the mold is closed. In the method for manufacturing a tire vulcanizing bladder that is introduced into the cavity between the core,
A strip made of the unvulcanized rubber is curved in an annular shape and placed in the material placement space with the ends joined together, and each end of the strip has at least one curved surface or a plurality of flat surfaces. forming a joint surface having a three-dimensional structure including Manufacture of a tire vulcanizing bladder characterized in that at least one protrusion is provided, at least one recess is provided in the joint surface of the other end of the strip, and the protrusion and the recess have a shape that meshes with each other . Method. 前記帯状体の長手方向に対して垂直方向の断面積に対する前記接合面の接触面積の比が２．４以上であることを特徴とする請求項１に記載のタイヤ加硫用ブラダーの製造方法。 2. The method of manufacturing a tire vulcanizing bladder according to claim 1, wherein a ratio of a contact area of said joint surface to a cross-sectional area of said strip in a direction perpendicular to the longitudinal direction thereof is 2.4 or more.
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Citations (4)

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Publication number Priority date Publication date Assignee Title
JP2001121549A (en) 1999-10-27 2001-05-08 Sumitomo Rubber Ind Ltd Method for making bladder for vulcanizing tire
JP2002120231A (en) 2000-10-17 2002-04-23 Bridgestone Corp Mold for manufacturing rubber crawler
JP2014201276A (en) 2013-04-09 2014-10-27 株式会社ブリヂストン Tire and method for production thereof
JP2018008441A (en) 2016-07-14 2018-01-18 住友ゴム工業株式会社 Manufacturing method of vulcanization bladder and raw material rubber sheet

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JPS5787939A (en) * 1980-11-25 1982-06-01 Yokohama Rubber Co Ltd:The Manufacture of rubber bladder for tyre vulcanization molding
JPH11291347A (en) * 1998-04-06 1999-10-26 Kanegafuchi Chem Ind Co Ltd Heat resistant resin belt and its manufacture

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Publication number Priority date Publication date Assignee Title
JP2001121549A (en) 1999-10-27 2001-05-08 Sumitomo Rubber Ind Ltd Method for making bladder for vulcanizing tire
JP2002120231A (en) 2000-10-17 2002-04-23 Bridgestone Corp Mold for manufacturing rubber crawler
JP2014201276A (en) 2013-04-09 2014-10-27 株式会社ブリヂストン Tire and method for production thereof
JP2018008441A (en) 2016-07-14 2018-01-18 住友ゴム工業株式会社 Manufacturing method of vulcanization bladder and raw material rubber sheet

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