JP2011042140A - Method for manufacturing annular tread member for retreaded tires - Google Patents

Method for manufacturing annular tread member for retreaded tires Download PDF

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JP2011042140A
JP2011042140A JP2009193164A JP2009193164A JP2011042140A JP 2011042140 A JP2011042140 A JP 2011042140A JP 2009193164 A JP2009193164 A JP 2009193164A JP 2009193164 A JP2009193164 A JP 2009193164A JP 2011042140 A JP2011042140 A JP 2011042140A
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vulcanization
vulcanized
rubber member
tread
molds
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Toshio Horiki
利夫 堀木
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Bridgestone Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing an annular tread member for a retreaded tire enabling the manufacture of annular tread members of various dimensions in a vulcanization mold with a small number of parts compared with conventional ones. <P>SOLUTION: An unvulcanized rubber member 1 formed in band shape is clamped between vulcanization molding molds 2, 3 shorter in length than the rubber member from the sticking surface 1a side to a base tire and the tread surface 1b side excluding both longitudinal ends. The rubber member 1 is then heated and vulcanized in the vulcanization molding molds 2, 3, and a vulcanized band-like rubber member 1 is removed from the vulcanization molding molds 2, 3. Both longitudinal ends of the rubber member 1 are allowed to abut each other to form annular shape. In this state, the rubber member 1 is clamped from the sticking surface 1a side to the base tire and the tread face 1b side by vulcanization joining molds 4, 5, and the rubber member 1 is heated and vulcanized in the vulcanization joining molds 4, 5 to vulcanization-join both ends, thus obtaining the vulcanized annular tread member. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

この発明は、更生タイヤの製造に当たって、台タイヤの外周面に貼り付けられる、所定寸法の円環状に形成された加硫済みのトレッド部材(プレキュアトレッド)の製造方法に関するものであり、特に、従来に比べて少ない部品点数の加硫モールドで、より多くの寸法の円環状トレッド部材を製造可能な方法を提案する。   The present invention relates to a method of manufacturing a vulcanized tread member (precure tread) formed in an annular shape with a predetermined dimension, which is affixed to the outer peripheral surface of a base tire when manufacturing a retread tire. The present invention proposes a method capable of producing an annular tread member having a larger number of dimensions with a vulcanization mold having a smaller number of parts than conventional ones.

トラック、バス等に用いられる自動車用タイヤや航空機用タイヤは、トレッドが完全に摩耗して使用寿命に達した場合であっても、カーカス、ベルト、ビード等は依然として継続使用可能な場合が多い。そこで、使用済みタイヤをバフ処理してトレッドを除去して台タイヤとした後、新たなトレッド部材を台タイヤのクラウン部に貼り付け、再び更生タイヤとして用いることが広く行われている。   In the case of automobile tires and aircraft tires used for trucks, buses, etc., carcass, belts, beads, etc. can still be used continuously even when the tread is completely worn out and reaches the service life. In view of this, it has been widely practiced that after a used tire is buffed to remove a tread to form a base tire, a new tread member is attached to the crown portion of the base tire and used again as a retread tire.

かかるトレッド部材としては、帯状に成形した加硫済みゴム部材を、台タイヤの外周長より若干短い長さに予め切断して構成された帯状トレッド部材がある。このような帯状トレッド部材は、予めバフ加工等によって、摩耗したトレッドを除去した台タイヤの外面に巻き付けられ、作業者が目視で確認しながら長さを伸ばしつつ、それの先端と後端とを台タイヤの外面上で突き合わせるようにすることで、台タイヤに貼り付けられる(例えば特許文献1参照)。   As such a tread member, there is a belt-like tread member configured by cutting a vulcanized rubber member formed into a belt shape into a length slightly shorter than the outer peripheral length of the base tire. Such a belt-like tread member is wound around the outer surface of the base tire from which the worn tread has been removed by buffing or the like in advance, and the front and rear ends of the belt-like tread member are stretched while the operator visually confirms the length. It is affixed on a base tire by abutting on the outer surface of a base tire (for example, refer patent document 1).

また、前記の帯状ゴム部材の両端を予め接合し、図2に示すように、これを円環状のモールド内で加硫して、所定の寸法の内径を有する円環状のトレッド部材としたものも知られている。かかる円環状トレッド部材は、台タイヤのクラウン部の外周に嵌め合わせられ、トレッド部材の外面から圧縮力を加えることで台タイヤに貼り付けられる(例えば特許文献2参照)。   Further, both ends of the belt-like rubber member are joined in advance, and as shown in FIG. 2, this is vulcanized in an annular mold to form an annular tread member having an inner diameter of a predetermined dimension. Are known. Such an annular tread member is fitted on the outer periphery of the crown portion of the base tire, and is applied to the base tire by applying a compressive force from the outer surface of the tread member (see, for example, Patent Document 2).

特開2008−1067号公報JP 2008-1067 A 特開2006−346930号公報JP 2006-346930 A

特許文献2に記載されているように、更生タイヤの製造に当たり、円環状のトレッド部材を使用する場合には、円環状トレッド部材は、更生タイヤのタイヤサイズに応じた寸法とする必要があり、このため、各タイヤサイズに専用の加硫モールドを準備しなければならない。しかし、加硫モールドは高価である上、その保管に必要なスペースも大きく、これらが設備コストを上昇させる要因となっている。   As described in Patent Document 2, in the production of a retread tire, when using an annular tread member, the annular tread member needs to have dimensions according to the tire size of the retread tire. For this reason, a dedicated vulcanization mold must be prepared for each tire size. However, the vulcanization mold is expensive and requires a large space for storage, which increases the equipment cost.

したがって、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、その目的は、従来に比べて少ない部品点数の加硫モールドで、種々の寸法の円環状トレッド部材の製造を可能とする更生タイヤ用円環状トレッド部材の製造方法を提供することにある。   Accordingly, an object of the present invention is to solve such problems of the prior art, and the object of the present invention is a vulcanization mold having a smaller number of parts than conventional ones, and an annular shape having various dimensions. It is providing the manufacturing method of the annular tread member for retreaded tires which enables manufacture of a tread member.

上記の目的を達成するため、この発明は、更生タイヤの製造に当たって、台タイヤの外周面に貼り付けられる、加硫済みの円環状のトレッド部材を製造する方法であって、帯状に成形された未加硫のゴム部材を、その長手方向両端部を除いて、該ゴム部材の長さよりも小さい長さを有する一対の平板状の加硫成型モールドにより、台タイヤへの貼り付け面側及びトレッド面側から挾持し、前記加硫成型モールドによりゴム部材を加熱して加硫し、加硫した帯状ゴム部材を前記加硫成型モールドから外し、その長手方向両端部をつき合わせて円環状とした状態で、一対の平板状の加硫接合モールドにより、台タイヤへの貼り付け面側及びトレッド面側から挾持し、前記加硫接合モールドによりゴム部材を加熱して加硫し、前記両端部を加硫接合して、加硫済みの円環状のトレッド部材を形成することを特徴とする製造方法である。かかる構成を採用することにより、平板状の加硫成型モールド及び加硫接合モールドを汎用して異なるタイヤサイズの更生タイヤ用円環状トレッド部材を製造することができ、各タイヤサイズに専用の加硫モールドを準備する必要が無くなる。   In order to achieve the above object, the present invention is a method for manufacturing a vulcanized annular tread member to be attached to the outer peripheral surface of a base tire in the manufacture of a retread tire, which is formed into a belt shape. The unvulcanized rubber member is attached to the base tire and the tread by a pair of flat plate vulcanization molding molds having a length smaller than the length of the rubber member except for both ends in the longitudinal direction. Gripping from the surface side, heating and vulcanizing the rubber member with the vulcanization mold, removing the vulcanized belt-like rubber member from the vulcanization mold, and joining the both ends in the longitudinal direction to form an annular shape In this state, a pair of flat plate vulcanization bonding molds are used to hold them from the surface to be attached to the base tire and the tread surface side, and the rubber members are heated and vulcanized by the vulcanization bonding molds. Vulcanization joining Te is a manufacturing method characterized by forming a vulcanized annular tread member. By adopting such a configuration, it is possible to manufacture flat tread vulcanization molds and vulcanization joining molds to produce annular tread members for retread tires of different tire sizes, and vulcanization dedicated to each tire size. There is no need to prepare a mold.

なお、ここでいう帯状ゴム部材の「貼り付け面側」とは、更生タイヤの製造に当たって、台タイヤへ接着される側のことを意味し、円環状トレッド部材の状態では内周面となる側である。また、「トレッド面側」とは、貼り付け面側と対向する側であり、加硫時にトレッドパターンが付される側のことを意味し、円環状トレッド部材の状態では外周面となる側である。   Here, the “attachment surface side” of the belt-like rubber member means the side that is bonded to the base tire in the manufacture of the retreaded tire, and the side that becomes the inner peripheral surface in the state of the annular tread member It is. Further, the “tread surface side” is a side facing the affixing surface side and means a side to which a tread pattern is applied during vulcanization. In the state of an annular tread member, is there.

この発明によれば、異なるサイズの更生タイヤ用トレッド部材に対して、同一の加硫成型モールド及び加硫接合モールドを共用することができるので、タイヤサイズ毎の専用加硫モールドを準備する必要のある従来の製造方法に比べて、大幅に製造設備を簡略化することができる。   According to this invention, since the same vulcanization molding mold and vulcanization joining mold can be shared for tread members for retread tires of different sizes, it is necessary to prepare a dedicated vulcanization mold for each tire size. Compared with a certain conventional manufacturing method, manufacturing equipment can be greatly simplified.

この発明に用いる帯状ゴム部材の斜視図である。It is a perspective view of the belt-shaped rubber member used for this invention. この発明に従う更生タイヤ用トレッド部材の製造方法における加硫成型工程を示す概略図である。It is the schematic which shows the vulcanization molding process in the manufacturing method of the tread member for retreaded tires according to this invention. この発明に従う更生タイヤ用トレッド部材の製造方法における加硫接合工程を示す概略図である。It is the schematic which shows the vulcanization joining process in the manufacturing method of the tread member for retreaded tires according to this invention.

以下、図面を参照して、この発明の代表的な実施の形態を説明する。図1は、この発明に従う更生タイヤ用トレッド部材の製造に用いる帯状ゴム部材の斜視図であり、図2は、更生タイヤ用トレッド部材の製造方法における加硫成型工程を示す概略図であり、図2は加硫接合工程を示す概略図である。   Hereinafter, typical embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a belt-shaped rubber member used for manufacturing a tread member for a retread tire according to the present invention, and FIG. 2 is a schematic view showing a vulcanization molding process in the method for manufacturing a tread member for a retread tire. 2 is a schematic view showing a vulcanization joining step.

まず、押出機により押出し成型された未加硫のゴム部材を、更生タイヤのタイヤサイズに応じた所定の長さに切断し、未加硫の帯状のゴム部材1を形成する。   First, an unvulcanized rubber member extruded by an extruder is cut into a predetermined length according to the tire size of the retreaded tire to form an unvulcanized belt-shaped rubber member 1.

次に、この帯状ゴム部材1を加硫成型装置に送る。加硫成型装置には、更生タイヤのトレッド断面形状に対応する内輪郭形状を有する下側加硫成型モールド2と、更生タイヤのトレッドパターンに対応する溝を形成するためのブレードを有する上側加硫成型モールド3とが、対向して設けられており、これら加硫成型モールドの間に物体を挾持し、プレスすることができるように構成されている。また、下側及び上側加硫成型モールド2、3は、前述した未加硫の帯状ゴム部材よりも短く構成されている。さらに、この加硫成型装置は、加硫成型モールド2、3によるプレス圧力及びこれら加硫成型モールド2、3の加熱温度を制御することができる。   Next, this belt-like rubber member 1 is sent to a vulcanization molding apparatus. The vulcanization molding apparatus includes a lower vulcanization molding mold 2 having an inner contour shape corresponding to a tread cross-sectional shape of a retread tire, and an upper vulcanization having a blade for forming a groove corresponding to the tread pattern of the retread tire. A molding mold 3 is provided so as to be opposed to each other, and an object can be held between these vulcanization molding molds and pressed. The lower and upper vulcanization molding molds 2 and 3 are configured to be shorter than the unvulcanized belt-shaped rubber member described above. Furthermore, this vulcanization molding apparatus can control the press pressure by the vulcanization molds 2 and 3 and the heating temperature of these vulcanization molds 2 and 3.

加硫成型装置に送られた帯状ゴム部材1は、台タイヤへの貼り付け面1a側から下側加硫成型モールド2により、トレッド面1b側から上側加硫成型モールド3により、挾持される。この際、帯状ゴム部材1の長手方向両端部が加硫モールド2、3の外部に出るように、すなわち、長手方向両端部が挾持されないように帯状ゴム部材1の位置決めを行う。   The belt-like rubber member 1 sent to the vulcanization molding apparatus is held by the lower vulcanization mold 2 from the surface 1a attached to the base tire and by the upper vulcanization mold 3 from the tread surface 1b side. At this time, the belt-shaped rubber member 1 is positioned so that both ends in the longitudinal direction of the belt-shaped rubber member 1 come out of the vulcanization molds 2 and 3, that is, the both ends in the longitudinal direction are not pinched.

この状態で、プレス圧力及び加熱温度の制御を行いつつ、所定の時間にわたり、挾持された部分を加熱して加硫成型を行う。プレス圧力及び加熱温度の設定は、使用するゴムの材質、寸法等を考慮して適宜に行うことができるが、一般的にはプレス圧力が面圧として0〜4.9MPa、加熱温度として挾持された部分で130〜180℃、加硫を行わない部分で20〜100℃を用いることができる。   In this state, vulcanization molding is performed by heating the held portion for a predetermined time while controlling the press pressure and the heating temperature. The press pressure and heating temperature can be set appropriately in consideration of the material, dimensions, etc. of the rubber to be used. In general, the press pressure is maintained as 0 to 4.9 MPa as the surface pressure and as the heating temperature. It is possible to use 130 to 180 ° C. at the part where the heat treatment is performed and 20 to 100 ° C. at the part where the vulcanization is not performed.

このようにして長手方向両端部を除いて加硫成型されたゴム部材1は、加硫成型モールド2、3から取り外され、加硫接合装置に送られる。この状態での帯状ゴム部材1は、長手方向両端部は未加硫のままであるが、加硫成型モールド2、3に挾持されていた部分は加硫済となっている。   The rubber member 1 vulcanized and molded except for both ends in the longitudinal direction in this manner is removed from the vulcanized molds 2 and 3 and sent to the vulcanization joining apparatus. The belt-like rubber member 1 in this state remains unvulcanized at both ends in the longitudinal direction, but the portions held between the vulcanization molds 2 and 3 are vulcanized.

加硫接合装置は、加硫成型装置と同様に、対向して配置された一対の平板状の加硫接合モールド4、5を有しており、これら加硫接合モールド4、5の間に物体を挾持し、プレスすることができるように構成されている。また、この加硫接合装置は、加硫接合モールド4、5によるプレス圧力及びこれら加硫接合モールド4、5の加熱温度を制御することができる。   Similar to the vulcanization molding apparatus, the vulcanization joining apparatus has a pair of flat plate-like vulcanization joining molds 4 and 5 disposed opposite to each other, and an object between these vulcanization joining molds 4 and 5 is provided. Can be held and pressed. Moreover, this vulcanization joining apparatus can control the press pressure by the vulcanization joining molds 4 and 5 and the heating temperature of these vulcanization joining molds 4 and 5.

加硫接合装置に送られたゴム部材1は、その長手方向両端部をつき合わせて円環状とされた後、この両端部を、台タイヤへの貼り付け面1a側から下側加硫接合モールド4により、及びトレッド面1b側から上側加硫接合モールド5により、挾持される。   The rubber member 1 sent to the vulcanizing and joining apparatus is formed into an annular shape by joining the both ends in the longitudinal direction, and then the both ends are joined to the lower vulcanizing and joining mold from the surface 1a attached to the base tire. 4 and by the upper vulcanization joining mold 5 from the tread surface 1b side.

この状態で、プレス圧力及び加熱温度の制御を行いつつ、所定の時間にわたり、挾持された部分の加硫接合を行う。プレス圧力及び加熱温度の設定は、使用するゴムの材質、寸法等を考慮して適宜に行うことができるが、一般的にはプレス圧力が面圧として0〜4.9MPa、加熱温度として130〜180℃程度を用いることができる。   In this state, vulcanization joining of the held portion is performed for a predetermined time while controlling the press pressure and the heating temperature. The setting of the pressing pressure and the heating temperature can be appropriately performed in consideration of the material, dimensions and the like of the rubber to be used. About 180 ° C. can be used.

以上の工程により、円環状のトレッド部材が得られる。クッションゴムを介してこのトレッド部材を台タイヤに貼り付け、図示しない加硫装置にてクッションゴムを加硫することにより、更生タイヤが完成する。   An annular tread member is obtained by the above steps. By attaching the tread member to the base tire via the cushion rubber and vulcanizing the cushion rubber with a vulcanizing device (not shown), a retread tire is completed.

この製造方法によれば、加硫成型モールドで加硫される部分の長さは同一にしつつ、加硫接合モールドで加硫接合される部分の長さを変えることで、同一の製造設備で周長の異なる円環状トレッド部材を製造することが可能となる。したがって、各タイヤサイズに専用の加硫モールドを準備する必要のあった従来技術に比べて、必要となる加硫モールドの数が大幅に減り、またその保管スペースも少なくて済むことから、大幅な設備コストの削減を達成できる。   According to this manufacturing method, the length of the portion to be vulcanized by the vulcanization molding mold is made the same, but the length of the portion to be vulcanized and bonded by the vulcanization bonding mold is changed, so that the same manufacturing equipment can be used. It becomes possible to produce annular tread members having different lengths. Therefore, the number of vulcanization molds required is significantly reduced and the storage space is reduced compared to the prior art that required the preparation of a dedicated vulcanization mold for each tire size. Equipment cost reduction can be achieved.

なお、上述したところは、この発明の実施形態の一部を示したに過ぎず、この発明の趣旨を逸脱しない限り、これらの構成を相互に組み合わせたり、種々の変更を加えたりすることができる。例えば、図示の実施形態では、長尺の加硫成型モールドを用いているが、短尺の加硫成型モールドを複数連結して加硫成型モールドを構成してもよい。この場合には、連結する加硫成型モールドの個数を増減することにより、当初に加硫成型する部分の長さを変えることができるので、より多くの寸法の円環状トレッド部材を製造することができる。   Note that the above description shows only a part of the embodiment of the present invention, and these configurations can be combined with each other or various modifications can be made without departing from the gist of the present invention. . For example, in the illustrated embodiment, a long vulcanization mold is used, but a plurality of short vulcanization molds may be connected to form a vulcanization mold. In this case, by increasing or decreasing the number of vulcanization molds to be connected, it is possible to change the length of the portion that is initially vulcanized and molded, so that it is possible to manufacture an annular tread member having more dimensions. it can.

以上の説明から明らかなように、この発明によって、従来に比べて少ない部品点数の加硫モールドで、種々の寸法の円環状トレッド部材の製造を可能とする更生タイヤ用円環状トレッド部材の製造方法を提供することが可能となった。   As is apparent from the above description, according to the present invention, a method for producing an annular tread member for retreaded tires that enables production of an annular tread member of various dimensions with a vulcanization mold having a smaller number of parts than conventional ones. It became possible to provide.

1 帯状ゴム部材
1a 貼り付け面
1b トレッド面
2 下側加硫成型モールド
3 上側加硫成型モールド
4 下側加硫接合モールド
5 上側加硫接合モールド
DESCRIPTION OF SYMBOLS 1 Band-shaped rubber member 1a Adhesion surface 1b Tread surface 2 Lower vulcanization molding mold 3 Upper vulcanization molding mold 4 Lower vulcanization bonding mold 5 Upper vulcanization bonding mold

Claims (1)

更生タイヤの製造に当たって、台タイヤの外周面に貼り付けられる、加硫済みの円環状のトレッド部材を製造する方法であって、
帯状に成形された未加硫のゴム部材を、その長手方向両端部を除いて、該ゴム部材の長さよりも小さい長さを有する一対の平板状の加硫成型モールドにより、台タイヤへの貼り付け面側及びトレッド面側から挾持し、
前記加硫成型モールドによりゴム部材を加熱して加硫し、
加硫した帯状ゴム部材を前記加硫成型モールドから外し、
その長手方向両端部をつき合わせて円環状とした状態で、一対の平板状の加硫接合モールドにより、台タイヤへの貼り付け面側及びトレッド面側から挾持し、
前記加硫接合モールドによりゴム部材を加熱して加硫し、前記両端部を加硫接合して、加硫済みの円環状のトレッド部材を形成することを特徴とする製造方法。
In manufacturing a retread tire, a method of manufacturing a vulcanized annular tread member that is attached to the outer peripheral surface of a base tire,
The unvulcanized rubber member formed in a band shape is attached to a base tire by a pair of flat plate vulcanization molding molds having a length smaller than the length of the rubber member except for both ends in the longitudinal direction. Hold it from the side of the attaching surface and the side of the tread surface,
The rubber member is heated and vulcanized by the vulcanization mold,
Remove the vulcanized rubber band member from the vulcanization mold,
In a state where the both ends in the longitudinal direction are put together to form an annular shape, by a pair of flat plate vulcanization joining molds, it is held from the surface to be attached to the base tire and the tread surface side,
A manufacturing method, wherein a rubber member is heated and vulcanized by the vulcanization joining mold, and both end portions are vulcanized and joined to form a vulcanized annular tread member.
JP2009193164A 2009-08-24 2009-08-24 Method for manufacturing annular tread member for retreaded tires Withdrawn JP2011042140A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016052790A (en) * 2011-10-26 2016-04-14 ブリヂストン バンダッグ リミティッド ライアビリティ カンパニーBridgestone Bandag, LLC. Molded article die-cutter and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016052790A (en) * 2011-10-26 2016-04-14 ブリヂストン バンダッグ リミティッド ライアビリティ カンパニーBridgestone Bandag, LLC. Molded article die-cutter and method

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