JP2012171217A - Precure tread, production method of retreaded tire using the precure tread, and retreaded tire - Google Patents

Precure tread, production method of retreaded tire using the precure tread, and retreaded tire Download PDF

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JP2012171217A
JP2012171217A JP2011035622A JP2011035622A JP2012171217A JP 2012171217 A JP2012171217 A JP 2012171217A JP 2011035622 A JP2011035622 A JP 2011035622A JP 2011035622 A JP2011035622 A JP 2011035622A JP 2012171217 A JP2012171217 A JP 2012171217A
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tire
precure tread
groove
tread
band
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JP6031220B2 (en
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Kenji Kawagoe
健次 川越
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Bridgestone Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a precure tread, which is capable of improving tire durability without spoiling an aesthetic appearance of the tire, and also capable of controlling a production cost, to provide a production method of a retreated tire using the precure tread, and to provide the retreaded tire.SOLUTION: The precure tread comprises a belt-like member containing a belt-like vulcanized rubber, which is stuck along the circumferential direction of a base tire on the base tire, and stuck together at the ends of circumferential direction each other when being stuck. The precure tread has at least one groove on the surface which is a tread side of the tire and the bottom of the groove is flat. Then, when the belt-like member is stuck together at the ends of circumferential direction each other, at least a portion of the ends of circumferential direction of the belt-like member is positioned at a flat part of the bottom of the groove. Further, the production method of the retreaded tire using the precure tread, and the retreaded tire are provided.

Description

この発明は、台タイヤ上にて該台タイヤの周方向に沿わせて貼り付けられ、該貼り付けの際に周方向端同士を貼り合わせる帯状の加硫済みゴムを含む帯状部材からなり、タイヤの接地面側となる表面に少なくとも一本の溝を具え、該溝の溝底は平坦であるプレキュアトレッド、かかるプレキュアトレッドを用いた更生タイヤの製造方法及び更生タイヤに関するものであり、かかるタイヤの美的外観を損なうこと無く、タイヤの耐久性を向上させ、かつ、製造コストの抑制を図る。   The present invention comprises a belt-like member including a belt-like vulcanized rubber that is pasted along the circumferential direction of the tire on a tire, and the circumferential ends are stuck together at the time of the tire. The present invention relates to a precured tread having at least one groove on the surface to be a contact surface side, and a groove bottom of the groove being flat, a method for manufacturing a retread tire using the precure tread, and a retreaded tire. The durability of the tire is improved and the manufacturing cost is suppressed without impairing the aesthetic appearance of the tire.

タイヤのリサイクルとして更生タイヤが広く知られている。更生タイヤは使用済みのタイヤからトレッド又はトレッドと一部のベルト層を削除したものを台タイヤとしたもので、トレッド部を新しい素材で貼り替えたものをいう。そして、更生タイヤの製造方法には、ゴムを含む帯状部材を予め長尺のモールドでパターン付け及び加硫を行って、プレキュアトレッドを形成し、かかるプレキュアトレッドを台タイヤに比較的低温かつ接着面において低圧状態で加硫接着する方法がある（例えば、特許文献１を参照）。   Rehabilitated tires are widely known as tire recycling. Rehabilitated tires are tires obtained by removing the tread or tread and part of the belt layer from the used tires, and the tread part is replaced with a new material. And in the manufacturing method of a retread tire, a belt-like member containing rubber is previously patterned and vulcanized with a long mold to form a precure tread, and this precure tread is applied to the base tire at a relatively low temperature. There is a method of vulcanizing and bonding at a low pressure state on the bonding surface (see, for example, Patent Document 1).

台タイヤ上にプレキュアトレッドを貼り付ける際には、帯状部材により構成されたプレキュアトレッドを台タイヤ上に沿わせて貼り付け、その周方向端同士を接触させて貼り合わせる。このとき、台タイヤとプレキュアトレッドとの間には両者の接着性を有利に確保する観点から、クッションゴムが配されることとなる。   When the precure tread is affixed on the base tire, the precure tread composed of a belt-like member is attached along the base tire, and the circumferential ends thereof are brought into contact with each other for pasting. At this time, a cushion rubber is disposed between the base tire and the precure tread from the viewpoint of advantageously ensuring the adhesion between the two.

特開平１０−１１９０５４号公報JP-A-10-119054

図１（a）〜（ｃ）に示すように、帯状部材により構成されたプレキュアトレッドの周方向端同士を接触させて貼り合わせる際には、両周方向端の間にクッションゴムを配することとなるが、両周方向端の間に配されるクッションゴムは、接着性を充分に確保する観点から、プレキュアトレッドのタイヤ径方向長さよりもそのタイヤ径方向長さを大きくしておく必要があった。しかし、このことにより、外側にクッションゴム部が大きくはみだして露出し、美的外観が損なわれしまう場合があった。また、更生タイヤは、一般の新品のタイヤに比して、製造コストを抑えられる点において消費者に有利であり、常にその製造コストの抑制が希求されている。更に、更生タイヤは、新品タイヤ並の耐久性が求められている背景から、常に耐久性の更なる向上が求められている。 As shown in FIGS. 1 (a) to 1 (c), when the circumferential ends of the precure tread constituted by the band-shaped members are brought into contact with each other and bonded together, cushion rubber is disposed between the circumferential ends. However, the cushion rubber disposed between the ends in the circumferential direction has a tire radial length that is larger than the tire radial length of the precure tread from the viewpoint of ensuring sufficient adhesion. There was a need. However, this may cause the cushion rubber portion to protrude greatly and be exposed outside, and the aesthetic appearance may be impaired. Further, retreaded tires are advantageous to consumers in that the manufacturing costs can be reduced compared to general new tires, and the suppression of the manufacturing costs is always desired. Furthermore, retreaded tires are always required to be further improved in durability because of the demand for durability equal to that of new tires.

従って、この発明の目的は、上記したようなタイヤの美的外観を損なうこと無く、タイヤの耐久性を向上させ、かつ、製造コストの抑制を図ることを可能とするプレキュアトレッド、かかるプレキュアトレッドを用いた更生タイヤの製造方法、及び更生タイヤを提供することにある。   Accordingly, an object of the present invention is to provide a precured tread capable of improving the durability of the tire and suppressing the manufacturing cost without impairing the aesthetic appearance of the tire as described above, and such a precured tread. It is in providing the manufacturing method of the retreaded tire using this, and a retreaded tire.

上記の目的を達成するために、この発明のプレキュアトレッドは、台タイヤ上にて台タイヤの周方向に沿わせて貼り付けられ、貼り付けの際に周方向端同士を貼り合わせる帯状の加硫済みゴムを含む帯状部材からなり、タイヤの接地面側となる表面に少なくとも一本の溝を具え、かかる溝の溝底は平坦であるプレキュアトレッドにおいて、帯状部材の周方向端同士を貼り合わせると、帯状部材の周方向端の少なくとも一部は、溝の溝底の平坦な部分に位置してなることを特徴とする。なお、ここでいう「平坦」な溝底とは、タイヤ径方向に対し直交する平面状となっている溝底の部分を言うものである。また、ここでいう「帯状の加硫済みゴムを含む帯状部材」とは、トレッドゴムのみにより構成された部材や、トレッドゴム及びベルト層によって構成された部材等を言うものである。   In order to achieve the above-mentioned object, the precure tread of the present invention is affixed along the circumferential direction of the base tire on the base tire, and a belt-like additive that sticks the circumferential ends together at the time of sticking. It is made of a belt-shaped member containing vulcanized rubber, and has a groove on the surface on the ground contact surface side of the tire, and the groove bottom of this groove is flat. When combined, at least a part of the circumferential end of the belt-like member is located in a flat portion of the groove bottom of the groove. Here, the “flat” groove bottom refers to a portion of the groove bottom having a planar shape perpendicular to the tire radial direction. Further, the “strip-shaped member including a vulcanized rubber strip” here refers to a member composed only of tread rubber, a member composed of tread rubber and a belt layer, or the like.

また、帯状部材の周方向端は、帯状部材の周方向端同士を貼り合わせると、溝の溝底に沿って、一方のプレキュアトレッド端から、他方のプレキュアトレッド端へと延びるように位置してなることが好ましい。   Further, the circumferential end of the belt-shaped member is positioned so as to extend from one precure tread end to the other precure tread end along the groove bottom of the groove when the circumferential ends of the strip member are bonded together. It is preferable that

更に、溝底における溝幅は、１ｍｍ以上であることが好ましい。   Furthermore, the groove width at the groove bottom is preferably 1 mm or more.

更にまた、溝の溝底と溝壁との間の連結部が曲率を有することが好ましい。   Furthermore, it is preferable that the connecting portion between the groove bottom and the groove wall has a curvature.

また、この発明の更生タイヤの製造方法は、上記した特徴を備えたプレキュアトレッドを用いて更生タイヤを製造する方法であって、台タイヤのトレッド部領域上にクッションゴムを貼り付ける工程と、クッションゴム上に帯状部材を貼り付け、帯状部材の周方向端間に、帯状部材の周方向端の厚みと、同一の厚みのクッションゴムを介在させて帯状部材の周方向端同士を貼り合わせる工程と、を含むことを特徴とする。   Further, the method for producing a retread tire of the present invention is a method for producing a retread tire using a precure tread having the above-described characteristics, and a step of attaching a cushion rubber on a tread portion region of a base tire, A step of attaching a band-shaped member on the cushion rubber and bonding the circumferential ends of the band-shaped member between the circumferential ends of the band-shaped member by interposing a cushion rubber having the same thickness as the circumferential end of the band-shaped member. It is characterized by including these.

そしてこの発明の更生タイヤは、上記した特徴を備えたプレキュアトレッドを用いることを特徴とする。   And the retread tire of this invention uses the precure tread provided with the above-mentioned characteristic.

この発明によれば、プレキュアトレッドのトレッド形状及びその周方向端位置の適正化を図ることにより、タイヤの美的外観を損なうこと無く、タイヤの耐久性を向上させ、かつ、製造コストの抑制を可能とするプレキュアトレッド、かかるプレキュアトレッドを用いた更生タイヤの製造方法及び更生タイヤを提供することが可能となった。 According to the present invention, by optimizing the tread shape of the precure tread and its circumferential end position, the durability of the tire is improved and the manufacturing cost is suppressed without impairing the aesthetic appearance of the tire. It has become possible to provide a precure tread that can be made, a method for producing a retread tire using the precure tread, and a retread tire.

（a）は、従来技術の更生タイヤの一部の平面図であり、（ｂ）は、（a）に示すI-I線断面図であり、（ｃ）は、（a）に示すII-II線断面図である。(A) is a plan view of a part of a conventional retread tire, (b) is a cross-sectional view taken along line II shown in (a), and (c) is a line II-II shown in (a). It is sectional drawing. （a）は、この発明に従う代表的な更生タイヤの一部の平面図であり、（ｂ）は、（a）に示すIII-III線断面図であり、（ｃ）は、（a）に示すIV-IV線断面図である。(A) is a plan view of a part of a typical retreaded tire according to the present invention, (b) is a sectional view taken along line III-III shown in (a), and (c) is shown in (a). FIG. 4 is a sectional view taken along line IV-IV. この発明に従うその他の更生タイヤの一部のタイヤ周方向断面図である。FIG. 6 is a tire circumferential sectional view of a part of another retread tire according to the present invention.

以下、図面を参照しつつこの発明の実施の形態を説明する。図２（a）は、この発明に従う更生タイヤの一部の平面図であり、図２（ｂ）は、図２（a）に示すIII-III線断面図であり、図２（ｃ）は、図２（a）に示すIV-IV線断面図である。図３は、この発明に従うその他の更生タイヤの一部のタイヤ周方向断面図である。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. 2 (a) is a plan view of a part of a retread tire according to the present invention, FIG. 2 (b) is a sectional view taken along line III-III shown in FIG. 2 (a), and FIG. FIG. 4 is a sectional view taken along line IV-IV shown in FIG. FIG. 3 is a tire circumferential sectional view of a part of another retread tire according to the present invention.

図２（ａ）〜（ｃ）に示す更生タイヤ１は、台タイヤ２のトレッド部領域上にクッションゴム３を貼り付けて、次いで、かかるクッションゴム３上に帯状の加硫済みゴムを含む帯状部材からなるプレキュアトレッド４を貼り付けることにより構成されたものである。なお、プレキュアトレッド４は、図２（ｂ）に示すように、クッションゴム３を介して台タイヤ２上に周方向に貼り付けられるが、このとき、プレキュアトレッド４を構成する帯状部材の周方向端５同士を貼り合わせる。また、タイヤの接地面側となる表面に、タイヤ周方向及びタイヤ幅方向に延在する複数本の溝６を具え、かかる溝６の溝底７は、図２（ｃ）に示すように平坦である。そして、帯状部材の周方向端５同士は、溝６の溝底７の平坦な部分に位置するように貼り合わされている。   Rehabilitation tire 1 shown in FIGS. 2 (a) to 2 (c) is a belt-like shape in which cushion rubber 3 is pasted on the tread portion region of base tire 2 and then belt-like vulcanized rubber is placed on cushion rubber 3. It is comprised by affixing the precure tread 4 which consists of a member. As shown in FIG. 2B, the precure tread 4 is affixed in the circumferential direction on the base tire 2 via the cushion rubber 3. At this time, the precure tread 4 is a belt-shaped member constituting the precure tread 4. The circumferential ends 5 are bonded together. Moreover, the surface which becomes the ground-contact surface side of a tire is provided with the several groove | channel 6 extended in a tire circumferential direction and a tire width direction, and the groove bottom 7 of this groove | channel 6 is flat as shown in FIG.2 (c). It is. The circumferential ends 5 of the belt-like member are bonded to each other so as to be positioned on a flat portion of the groove bottom 7 of the groove 6.

上記したように、周方向端５が溝６の溝底７の平坦な部分に位置するように帯状部材を貼り合わせることにより、図２（ｂ）及び（ｃ）に示すように、帯状部材の周方向端５同士が段差無く貼り付けられる。このことにより、図１（ｃ）に示すような段差に応力が集中することに起因した、溝底７におけるクラックの発生が抑制され、更生タイヤ１の耐クラック性すなわち耐久性が向上することとなる。また、このとき、図２（ｂ）に示すように、クッションゴム３が溝底７に沿って配されることから、図１（ｂ）に示すようにクッションゴム３がトレッド部踏面まで突出せずに、クッションゴム３のタイヤ径方向長さが全体に小さくなり、クッションゴム３のゴム量を少なくすることが可能となる。このことにより、更生タイヤ１の軽量化及び低コスト化が達成される。また、クッションゴム３がトレッド部踏面まで突出しないことから、美的概観も良くなる。更に、副次的な効果として、更生タイヤ１の軽量化に伴い、ユニフォミティも向上することから、燃費性も向上する。更にまた、クッションゴム３がトレッド部踏面まで突出することによるブロックの接地圧の変化を抑えることができることから、耐偏摩耗性が向上することとなる。
なお、上述した効果を有効に発揮する観点から、図２に示すように、帯状部材の周方向端５は、溝６の溝底７に沿って、一方のプレキュアトレッド端から、他方のプレキュアトレッド端へと延びて位置してなることが好ましいが、図示は省略するが、帯状部材の周方向端５の少なくとも一部が溝６の溝底７の平坦な部分に位置してなる構成とすることも可能であることには留意されたい。 As described above, as shown in FIGS. 2B and 2C, the band-shaped member is bonded so that the circumferential end 5 is positioned on the flat portion of the groove bottom 7 of the groove 6. The circumferential ends 5 are pasted without any step. As a result, the occurrence of cracks at the groove bottom 7 due to the stress concentration at the step as shown in FIG. 1C is suppressed, and the crack resistance of the retreaded tire 1, that is, the durability is improved. Become. At this time, as shown in FIG. 2B, the cushion rubber 3 is disposed along the groove bottom 7, so that the cushion rubber 3 protrudes to the tread portion tread as shown in FIG. 1B. Accordingly, the length of the cushion rubber 3 in the tire radial direction is reduced as a whole, and the rubber amount of the cushion rubber 3 can be reduced. Thereby, the weight reduction and cost reduction of the retread tire 1 are achieved. Further, since the cushion rubber 3 does not protrude to the tread surface, the aesthetic appearance is improved. Further, as a secondary effect, the uniformity of the retreaded tire 1 is improved and the fuel efficiency is improved. Furthermore, since the change in the ground contact pressure of the block due to the cushion rubber 3 projecting to the tread portion tread can be suppressed, uneven wear resistance is improved.
From the viewpoint of effectively exerting the above-described effect, the circumferential end 5 of the belt-shaped member extends from one precure tread end along the groove bottom 7 of the groove 6 as shown in FIG. Although it is preferable to be positioned to extend to the end of the cure tread, although not shown, at least a part of the circumferential end 5 of the band-shaped member is positioned at a flat portion of the groove bottom 7 of the groove 6. Note that it is also possible.

更にまた、溝６の溝底７における溝幅は、１．０ｍｍ以上であることが好ましい。なぜなら、かかる溝幅が、１．０ｍｍ未満となると、溝底７の平坦な部分が充分に確保されずに、帯状部材の周方向端５同士の正確な貼り付けが困難となり、貼り付けの失敗により段差が生じ、クラックの発生核となる可能性があるからである。   Furthermore, the groove width at the groove bottom 7 of the groove 6 is preferably 1.0 mm or more. This is because when the groove width is less than 1.0 mm, a flat portion of the groove bottom 7 is not sufficiently secured, and it is difficult to accurately paste the circumferential ends 5 of the belt-shaped member, and the bonding fails. This is because there is a possibility that a level difference will occur and become a nucleus for generating cracks.

加えて、図３に示すように、溝６の溝底７と溝壁８との間の連結部９が曲率を有することが好ましい。図２（ｃ）に示すように、連結部９が曲率を有していない場合には、タイヤ負荷転動時に、連結部にゴム変形による応力が過剰に集中し、連結部９がクラックの基点となってしまう可能性がある。そのことから、連結部９に負荷される応力を分散させて耐クラック性を向上させる観点から、連結部が曲率を有することが好ましい。なお、連結部９に負荷される応力を適当に分散させ、耐クラック性を向上させる観点から、連結部９の曲率は、２．０ｍｍ以上とすることが好ましい。なぜなら、連結部９の曲率半径が２．０ｍｍ未満の場合には、連結部９に歪みによるクラックが発生する可能性が高まるので、プレキュアトレッド１が台タイヤ３から剥離しやすくなるからである。   In addition, as shown in FIG. 3, it is preferable that the connecting portion 9 between the groove bottom 7 of the groove 6 and the groove wall 8 has a curvature. As shown in FIG.2 (c), when the connection part 9 does not have a curvature, the stress by rubber deformation will concentrate excessively on a connection part at the time of tire load rolling, and the connection part 9 will be a base point of a crack. There is a possibility of becoming. Therefore, it is preferable that the connecting portion has a curvature from the viewpoint of improving the crack resistance by dispersing the stress applied to the connecting portion 9. In addition, it is preferable that the curvature of the connection part 9 shall be 2.0 mm or more from a viewpoint of disperse | distributing the stress loaded to the connection part 9 appropriately, and improving crack resistance. This is because, when the radius of curvature of the connecting portion 9 is less than 2.0 mm, the possibility of cracking due to distortion in the connecting portion 9 increases, so that the precure tread 1 is easily peeled off from the base tire 3. .

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、これらの構成を交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。   The above description shows only a part of the embodiment of the present invention, and these configurations can be combined alternately or various changes can be made without departing from the gist of the present invention.

次に、図１に示す従来のプレキュアトレッドを台タイヤに貼り付けた更生タイヤ（従来例タイヤ）及び図２に示すこの発明に従うプレキュアトレッドを台タイヤに貼り付けた更生タイヤ（実施例タイヤ）を、タイヤサイズ１１Ｒ２２．５の空気入りタイヤとして、夫々試作し、各種評価を行ったので、以下に説明する。   Next, a retread tire (conventional example tire) in which the conventional precure tread shown in FIG. 1 is attached to a base tire and a retread tire (example tire) in which the precure tread according to the present invention shown in FIG. ) As a pneumatic tire having a tire size of 11R22.5, and various evaluations were made, which will be described below.

更生タイヤの耐クラック性（耐久性）は、各供試タイヤをサイズ８．２５のリムに装着してタイヤ車輪とし、このタイヤ車輪に空気圧７００ｋＰａ（相対圧）を適用し、タイヤ負荷荷重２５００ｋＮ、走行速度６０ｋｍ／ｈの条件下でドラム試験機上を２０，０００ｋｍ走行させる、走行後のタイヤを目視観察し、プレキュアトレッドの剥離の有無を確認し、溝幅比毎の剥離出現率を求めた。その結果を表１に示す。   The crack resistance (durability) of the retreaded tire is such that each test tire is mounted on a rim of size 8.25 to form a tire wheel, and an air pressure of 700 kPa (relative pressure) is applied to the tire wheel, and the tire load load is 2500 kN, Run the vehicle on a drum test machine at a running speed of 60 km / h for 20,000 km, visually observe the tire after running, check the presence or absence of peeling of the precure tread, and determine the peeling appearance rate for each groove width ratio. It was. The results are shown in Table 1.

更生タイヤの軽量化は、各供試タイヤの重量を測定し、従来例タイヤの重量を基準値として、１００として指数化し、実施例タイヤについて相対値を求め、それらを比較することで評価した。なお、数値が小さい程、軽量化が図られていることを表し、その結果を表１に示す。このとき、併せて、各供試タイヤを目視観察することにより、美的外観についても評価した。   The weight of the retreaded tire was evaluated by measuring the weight of each test tire, indexing the weight of the conventional tire as a reference value as 100, obtaining a relative value for the example tire, and comparing them. In addition, it represents that the weight reduction is achieved, so that a numerical value is small, and the result is shown in Table 1. At the same time, the aesthetic appearance was also evaluated by visually observing each test tire.

Figure 2012171217
表１の結果から明らかなように、実施例タイヤは、従来例タイヤに比して、耐久性が向上しており、かつ、クッションゴムの量が減っていることに起因して軽量化が図られていることがわかった。また、従来例タイヤに比してクッションゴムのトレッド部踏面側への突出が少ない実施例タイヤが、美的外観についても向上していた。
Figure 2012171217
 As is clear from the results in Table 1, the tires of the examples are more durable than the conventional tires and are lighter due to the reduced amount of cushion rubber. I found out. In addition, the tire of the example, in which the protrusion of the cushion rubber to the tread portion tread surface side is smaller than that of the conventional example tire, has also improved the aesthetic appearance.

以上の発明から明らかになったように、プレキュアトレッドのトレッド形状及びその周方向端位置の適正化を図ることにより、タイヤの美的外観を損なうこと無く、タイヤの耐久性を向上させ、かつ、製造コストの抑制を可能とするプレキュアトレッド、かかるプレキュアトレッドを用いた更生タイヤの製造方法及び更生タイヤを提供することが可能となった。   As apparent from the above invention, by improving the tread shape of the precure tread and the circumferential end position thereof, the durability of the tire is improved without impairing the aesthetic appearance of the tire, and It has become possible to provide a precure tread capable of suppressing production costs, a method for producing a retread tire using the precure tread, and a retread tire.

１ 更生タイヤ
２ 台タイヤ
３ クッションゴム
４ プレキュアトレッド
５ 帯状部材の周方向端
６ 溝
７ 溝底
８ 溝壁
９ 連結部 DESCRIPTION OF SYMBOLS 1 Rehabilitation tire 2 stand tire 3 Cushion rubber 4 Precured tread 5 Circumferential end 6 of a strip-shaped member Groove 7 Groove bottom 8 Groove wall 9 Connection

Claims (6)

台タイヤ上にて該台タイヤの周方向に沿わせて貼り付けられ、該貼り付けの際に周方向端同士を貼り合わせる帯状の加硫済みゴムを含む帯状部材からなり、タイヤの接地面側となる表面に少なくとも一本の溝を具え、該溝の溝底は平坦であるプレキュアトレッドにおいて、
前記帯状部材の周方向端同士を貼り合わせると、該帯状部材の周方向端の少なくとも一部は、前記溝の溝底の平坦な部分に位置してなることを特徴とするプレキュアトレッド。 It consists of a band-shaped member containing a band-shaped vulcanized rubber that is pasted along the circumferential direction of the base tire on the base tire and bonds the circumferential ends to each other at the time of the sticking. In a precure tread having at least one groove on the surface to be flat, and the groove bottom of the groove is flat,
A precure tread, wherein when the circumferential ends of the belt-like member are bonded together, at least a part of the circumferential edge of the belt-like member is located at a flat portion of the groove bottom of the groove. 前記帯状部材の周方向端は、該帯状部材の周方向端同士を貼り合わせると、前記溝の溝底に沿って、一方のプレキュアトレッド端から、他方のプレキュアトレッド端へと延びるように位置してなる、請求項１に記載のプレキュアトレッド。   The circumferential end of the band-shaped member extends from one precure tread end to the other precure tread end along the groove bottom of the groove when the circumferential ends of the band-shaped member are bonded together. The precure tread according to claim 1, which is located. 前記溝底における溝幅は、１ｍｍ以上である、請求項１又は２に記載のプレキュアトレッド。   The precure tread according to claim 1 or 2, wherein a groove width at the groove bottom is 1 mm or more. 前記溝の溝底と溝壁との間の連結部は、曲率を有する、請求項１〜３のいずれか一項に記載のプレキュアトレッド。   The precure tread according to any one of claims 1 to 3, wherein a connecting portion between a groove bottom and a groove wall of the groove has a curvature. 請求項１〜４のいずれか一項に記載のプレキュアトレッドを用いて更生タイヤを製造する方法であって、該方法は、
前記台タイヤのトレッド部領域上にクッションゴムを貼り付ける工程と、
該クッションゴム上に前記帯状部材を貼り付け、該帯状部材の周方向端間に、該帯状部材の周方向端の厚みと、同一の厚みのクッションゴムを介在させて該帯状部材の周方向端同士を貼り合わせる工程と、を含むことを特徴とするプレキュアトレッドの製造方法。 A method for producing a retread tire using the precure tread according to any one of claims 1 to 4, wherein the method comprises:
A step of attaching a cushion rubber on the tread portion region of the base tire;
The band-shaped member is affixed on the cushion rubber, and the circumferential end of the band-shaped member is interposed between the circumferential ends of the band-shaped member with a cushion rubber having the same thickness as the circumferential end of the band-shaped member. A method for producing a precure tread, comprising a step of bonding together. 請求項１〜４のいずれか一項に記載のプレキュアトレッドを用いることを特徴とする更生タイヤ。
A retread tire using the precure tread according to any one of claims 1 to 4.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01110135A (en) * 1987-09-21 1989-04-26 Teknor Apex Co Tire, to which pre-vulcanized tread is mounted, and manufacture thereof
JPH09156319A (en) * 1995-12-08 1997-06-17 Sumitomo Rubber Ind Ltd Pneumatic tire
JP2008001067A (en) * 2006-06-26 2008-01-10 Bridgestone Corp Jointing method of precure tread, and precure tread

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01110135A (en) * 1987-09-21 1989-04-26 Teknor Apex Co Tire, to which pre-vulcanized tread is mounted, and manufacture thereof
JPH09156319A (en) * 1995-12-08 1997-06-17 Sumitomo Rubber Ind Ltd Pneumatic tire
JP2008001067A (en) * 2006-06-26 2008-01-10 Bridgestone Corp Jointing method of precure tread, and precure tread

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