JPH09286206A - Retreading method for pneumatic tire - Google Patents
Retreading method for pneumatic tireInfo
- Publication number
- JPH09286206A JPH09286206A JP8101108A JP10110896A JPH09286206A JP H09286206 A JPH09286206 A JP H09286206A JP 8101108 A JP8101108 A JP 8101108A JP 10110896 A JP10110896 A JP 10110896A JP H09286206 A JPH09286206 A JP H09286206A
- Authority
- JP
- Japan
- Prior art keywords
- tire
- rubber
- belt
- reinforcing elements
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims description 11
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 58
- 239000004744 fabric Substances 0.000 claims abstract description 26
- 239000006185 dispersion Substances 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 abstract description 4
- 239000010959 steel Substances 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 26
- 239000000463 material Substances 0.000 description 12
- 238000000926 separation method Methods 0.000 description 6
- 238000000465 moulding Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- 238000004073 vulcanization Methods 0.000 description 4
- 239000000470 constituent Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003490 calendering Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 206010053759 Growth retardation Diseases 0.000 description 1
- 244000126211 Hericium coralloides Species 0.000 description 1
- 229920000271 Kevlar® Polymers 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000004761 kevlar Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
Landscapes
- Tires In General (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、使用を経て磨耗
による寿命に達した古タイヤを再生する、空気入りタイ
ヤの更生方法に関して、特に更生後のタイヤの耐久性を
向上しようとするものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of rehabilitating a pneumatic tire for reusing an old tire which has reached the end of its life due to wear, and particularly to improve the durability of the tire after rehabilitation. .
【０００２】古タイヤは、廃棄処分されるのが一般的で
あるが、磨耗トレッドを除外したタイヤの要部が健全な
ものについては、いわゆる更生タイヤとして再生するこ
とによって、その使用寿命の更新が可能である。タイヤ
の更生は、磨耗したトレッドゴムの貼り替え、いわゆる
リキャップが主流であり、さらに、トレッド下のベルト
に損傷がある場合は、いわゆるリベルトも行う必要があ
る。すなわち、磨耗トレッドゴムを除去してから、さら
にベルトを剥ぎ取り、その上に、ベルトとなるゴム引き
布を貼り付ける。その後、トレッドゴムを貼り付けてか
ら、加硫成形に供し、更生タイヤが得られる。[0002] Old tires are generally discarded, but if the tire main parts excluding the wear tread are sound, the service life of the tires can be renewed by reusing them as so-called retreaded tires. It is possible. For tire rehabilitation, replacement of worn tread rubber, so-called recap, is the mainstream, and if the belt under the tread is damaged, so-called rebelt must also be performed. That is, after removing the worn tread rubber, the belt is further peeled off, and a rubberized cloth to be the belt is attached thereon. After that, a tread rubber is attached and then subjected to vulcanization molding to obtain a retreaded tire.
【０００３】ここで、再生した更生タイヤ、特にリベル
トを行った更生タイヤは、トレッドが磨耗寿命に達する
までの期間、トレッド以外のタイヤ部分、とりわけベル
トに故障を発生させないことによって、タイヤ本来の寿
命を全うさせることが、好ましい。従って、タイヤの耐
久性、とりわけリベルトによるベルトの耐久性を確保す
ることが、肝要である。Recycled retreaded tires, especially retreaded tires, do not cause a failure in the tire portion other than the tread, particularly the belt, until the tread reaches the wear life, so that the tire has its original life. Is preferred. Therefore, it is important to secure the durability of the tire, especially the durability of the belt by the rebelt.
【０００４】[0004]
【従来の技術】上記タイヤのベルト材には、タイヤの赤
道面に対して斜めの並行配列をなすコードによる補強素
子を、等間隔に埋設されたゴム引き布を用いるのが通例
である。2. Description of the Related Art As a belt material for the above-mentioned tire, it is customary to use a rubberized cloth in which reinforcing elements made of cords arranged obliquely in parallel to the equatorial plane of the tire are embedded at equal intervals.
【０００５】[0005]
【発明が解決しようとする課題】補強素子の並行配列が
等間隔とされて来た従来のベルト材にあっては、その端
部にて、すなわちベルトにおいてはその幅端において、
各補強素子の端末に面するゴムがタイヤの接地変形の度
毎につつかれるため、はじめに微細なクラックを生じ、
やがて補強素子の隣接相互間にまたがって成長し、その
後はベルトの積層相互間にもつながって急拡大し、いわ
ゆるベルトセパレーションに至る。この亀裂進展速度は
格段に速いため、これがタイヤの耐久性を決定づけるこ
とになる。In the conventional belt material in which the parallel arrangement of the reinforcing elements has been arranged at equal intervals, at the end portion thereof, that is, at the width end of the belt,
Since the rubber facing the end of each reinforcing element is bent every time the tire touches down, a fine crack is generated at the beginning,
Eventually, the reinforcing elements grow over adjacent ones, and then they are also connected between the laminated layers of the belts to rapidly expand, leading to so-called belt separation. This crack growth rate is extremely fast, and this determines the durability of the tire.
【０００６】ここに、上記したクラックの成長を抑える
ことが重要で、そのためには補強素子の隣接相互間の間
隔の広い方がもちろん有利である反面、タイヤの軽量化
の強い要請に加えて必要とされるコードの簡素化のた
め、補強素子の線径を細くすることが望まれる。その結
果、同等のタイヤ強度を保持するために、当然乍ら補強
素子の打ち込みを多くする外はなく、補強素子の間隔は
却って狭くなりクラックの成長抑制とは相容れないとこ
ろである。Here, it is important to suppress the growth of the above-mentioned cracks, and for that purpose, it is of course advantageous that the distance between the adjacent reinforcing elements is wide, but on the other hand, in addition to the strong demand for reducing the weight of the tire, it is necessary. It is desirable to reduce the wire diameter of the reinforcing element in order to simplify the cord. As a result, in order to maintain the same tire strength, it is naturally necessary to increase the number of driving reinforcement elements, and the spacing between the reinforcement elements is rather narrow, which is incompatible with crack growth suppression.
【０００７】そこで、この発明の目的は、タイヤのベル
ト材の幅端にてゴム中に補強素子の末端に面して発生す
る微細なクラックの成長進展に由来する、ベルト耐久性
の劣化に対して有効適切な解決を与えることによって、
更生タイヤの耐久性を向上しようとするものである。Therefore, an object of the present invention is to prevent the deterioration of the belt durability due to the growth and development of fine cracks generated in the rubber at the width end of the belt material of the tire facing the end of the reinforcing element. By providing effective and appropriate solutions,
It is intended to improve the durability of retreaded tires.
【０００８】[0008]
【課題を解決するための手段】この発明は、使用済タイ
ヤの磨耗トレッドゴム、さらにベルトを除去した台タイ
ヤに、互いに並行配列をなす所定本数の補強素子による
ゴム引き布を貼り付け、次いでトレッドゴムを貼り付け
たのち、加硫成形を行う空気入りタイヤの更生方法にお
いて、該ゴム引き布に、その補強素子の少なくとも30％
を、数本以内の束に区分して、その束とこれに隣接する
補強素子との分散間隔を、上記所定本数の補強素子をゴ
ム引き布内で等間隔に配列した場合に比べて広くしたも
のを用いることを特徴とする、空気入りタイヤの更生方
法である。SUMMARY OF THE INVENTION According to the present invention, a worn tread rubber of a used tire and a base tire from which a belt has been removed are attached with a rubberized cloth having a predetermined number of reinforcing elements arranged in parallel with each other, and then the tread. In a method of rehabilitating a pneumatic tire, in which vulcanization molding is performed after rubber is attached, at least 30% of the reinforcing element is added to the rubberized cloth.
Is divided into several bundles within a few, and the dispersion interval between the bundle and the reinforcing elements adjacent thereto is made wider than that in the case where the above-mentioned predetermined number of reinforcing elements are arranged at equal intervals in a rubberized cloth. It is a method of rehabilitating a pneumatic tire, characterized by using a tire.
【０００９】ここで、補強素子としては、スチールコー
ドのほか、有機繊維のコードまたはモノフィラメント
が、有利に適合する。また、束が同一本数の補強素子よ
りなること、束が異なる本数の補強素子よりなること、
束内にて隣り合う少なくとも一部の補強素子が、互いに
接触する配列になること、そして束内にて隣り合う補強
素子の離間すき間が束の分散間隔よりも狭い配列になる
ことの各場合が含まれる。Here, as the reinforcing element, in addition to steel cords, organic fiber cords or monofilaments are advantageously suitable. Further, the bundle is composed of the same number of reinforcing elements, the bundle is composed of a different number of reinforcing elements,
In each case, at least some of the reinforcing elements adjacent to each other in the bundle are arranged in contact with each other, and the spacing between adjacent reinforcing elements in the bundle is smaller than the distribution distance of the bundle. included.
【００１０】なお、ベルトに必要とされる補強素子の総
本数の如何によって束の区分上の剰余を生じることがあ
り得るので、束の区分からはみ出した補強素子について
は、タイヤの全周にわたってほぼ均整になるような分散
配置とすることが好ましい。Since a surplus on the section of the bundle may be generated depending on the total number of the reinforcing elements required for the belt, the reinforcing element protruding from the section of the bundle is almost distributed over the entire circumference of the tire. It is preferable to make the dispersion arrangement so as to be balanced.
【００１１】この発明では、ベルト材に供する補強素子
のゴム引き布を用意するため、とくに櫛歯形ロールを改
良したカレンダがけロールによって、トリート材をまず
つくる。この櫛歯形ロールは、これによって補強素子を
数本毎、例えば２本宛の束の区分毎の並置配列をもっ
て、カレンダがけロールによりゴムシートと合体するよ
うに役立てる。In the present invention, in order to prepare the rubberized cloth for the reinforcing element to be used for the belt material, the treat material is first produced by the calendering roll which is an improved comb tooth roll. This comb-toothed roll thus serves to combine the reinforcing elements with the rubber sheet by means of a calendering roll with a juxtaposed arrangement of several reinforcing elements, for example every section of a bundle addressed to two.
【００１２】櫛歯形ロールは、補強素子の上記並置配列
のための複数の周溝を有し、この周溝は区分束の隣接相
互間をへだてるためのカラー状櫛歯によって区画し、周
溝は、互いに拘束なく接触する個々に独立した２本の補
強素子の区分束と対応した溝幅を有する。このようにし
てつくられるトリート材は、これをタイヤの補強などに
用いるとき、補強素子をタイヤの赤道面に対して傾斜さ
せる場合は、その必要な傾斜に応じてトリート幅を斜め
裁ちし、ついでトリートの幅端の耳同士を再接合したゴ
ムストリップとし、ライナーとともに原反コイルに巻き
とって、タイヤの更生工程に供される。The comb-toothed roll has a plurality of circumferential grooves for the juxtaposed arrangement of the reinforcing elements, which are defined by collar-shaped comb teeth for guiding between adjacent ones of the sorting bundles. The groove has a groove width corresponding to a piece bundle of two individual reinforcing elements which are in unconstrained contact with each other. When the treat material thus produced is used for reinforcement of a tire or the like, when the reinforcing element is inclined with respect to the equatorial plane of the tire, the treat width is diagonally cut according to the required inclination, and then, A rubber strip in which the ears at the width ends of the treat are rejoined is wound around a raw coil together with a liner, and is used in a tire rehabilitation process.
【００１３】[0013]
【発明の実施の形態】さて、図１(a) 〜(f) に、使用を
経て要部検査の上で適用されるタイヤの再生手順を示
し、同図(a) 中１は検査により適合と判定された古タイ
ヤであり、この古タイヤ１からまずトレッド２の残存ゴ
ムを同図(b) に斜線で示したようにバフィング除去し、
さらに同図(c) に示すように、図示例で４層のベルト３
の外側の損傷した第１層3aと第２層3bもベルト剥ぎ取り
機にて除去する。具体的には、タイヤのショルダー部を
ベルトの第２層3b端が露出するまでバフを行うか、又は
ピーリングにて削り出しを行う。その後、第２層3bと第
３層3c間に、ベルト剥ぎ取り機からナイフを挿入しベル
ト外側を除去する。かくして、ベルト３の第３層3cおよ
び第４層3dを残した、同図(d) の台タイヤ４を得る。な
お、ベルト３が複数層になる場合は、その損傷を受けた
ベルト層を除去し、損傷のないベルト層を残すことが、
工数およびコストの削減に有利である。BEST MODE FOR CARRYING OUT THE INVENTION Now, FIGS. 1 (a) to 1 (f) show a tire recycling procedure applied after inspection of essential parts after use. In FIG. 1 (a), 1 is adapted by inspection. It is an old tire that was judged to be the first one, and the residual rubber of the tread 2 was first removed from this old tire 1 by buffing as indicated by the diagonal lines in FIG.
Further, as shown in FIG. 3C, the four-layer belt 3 is shown in the illustrated example.
The damaged first layer 3a and second layer 3b on the outside of the sheet are also removed by a belt stripping machine. Specifically, the shoulder portion of the tire is buffed until the end of the second layer 3b of the belt is exposed, or it is carved by peeling. After that, a knife is inserted from the belt peeling machine between the second layer 3b and the third layer 3c to remove the outside of the belt. Thus, the base tire 4 shown in FIG. 3D, in which the third layer 3c and the fourth layer 3d of the belt 3 are left, is obtained. When the belt 3 has a plurality of layers, it is possible to remove the damaged belt layer and leave an intact belt layer.
It is advantageous in reducing man-hours and costs.
【００１４】次に、同図(e) に示すように、台タイヤ４
のベルト３の第３層3c上に、新たにベルトの第１層を形
成するゴム引き布５を巻き付ける。従って、得られる更
生用グリーンタイヤは、ベルト３が３層構造になる。さ
らに、同図(f) に示すように、次に、従来の慣例に従っ
てトレッドゴム６のリキャップを行い、更生用グリーン
タイヤを得る。このグリーンタイヤは、フルモールドを
用いた加硫成形に供され、再生タイヤが得られる。Next, as shown in FIG. 2 (e), the base tire 4
The rubberized cloth 5 which newly forms the first layer of the belt is wound around the third layer 3c of the belt 3. Therefore, in the obtained rehabilitation green tire, the belt 3 has a three-layer structure. Further, as shown in FIG. 6 (f), the tread rubber 6 is then recapped according to the conventional practice to obtain a rehabilitation green tire. This green tire is subjected to vulcanization molding using a full mold to obtain a recycled tire.
【００１５】ここで、ゴム引き布５に、そのスチールコ
ード等の補強素子の少なくとも30％を、数本以内の束に
区分して、その束とこれに隣接する補強素子との分散間
隔を、上記所定本数の補強素子をゴム引き布内で等間隔
に配列した場合に比べて広くしたものを用いることが、
肝要である。Here, at least 30% of the reinforcing elements such as steel cords are divided into several bundles within the rubber-lined cloth 5, and the dispersion interval between the bundle and the adjacent reinforcing elements is It is preferable to use a wider number of the above-mentioned predetermined number of reinforcing elements than in the case of arranging the reinforcing elements at equal intervals in the rubberized cloth,
It is essential.
【００１６】すなわち、ゴム引き布５は、図２の上段
(a) に示した在来例で、ゴム引き布中における補強素子
７の配列が何れも等間隔ｓであるのに対し、同じく下段
(b) でこの発明の場合の事例を示すように、補強素子７
の数本毎の区分束８として、等間隔ｓに比しより広い離
間間隔δに配列されている。That is, the rubberized cloth 5 is the upper part of FIG.
In the conventional example shown in (a), the reinforcing elements 7 in the rubber-lined cloth are arranged at equal intervals s.
As shown in the case of this invention in (b), the reinforcing element 7
The divided bundles 8 are arranged at intervals δ wider than the equal interval s.
【００１７】ところで、ベルトの端部におけるゴム破壊
の過程はすでに述べたように、補強素子の端末によって
これに面するゴム中に、タイヤの変形の反覆の度毎にく
り返されるつつきが微細なクラックを生じさせ、これが
補強素子の表面に沿って進む初期段階はともかくとし
て、従来の技術に従い等間隔で補強素子が並行配列され
た場合にいち早く補強素子の隣接相互間にまたがって成
長し始めるや忽ちにして、構成材の積層相互間につなが
るか、または構成材を中心としてタイヤの外側あるいは
内側に向かって急拡大し、各種のセパレーションやクラ
ック等に進展する不利があった。By the way, as described above, the process of rubber breakage at the end portion of the belt is such that the pecking which is repeated every time the tire is repeatedly deformed in the rubber facing the end of the reinforcing element by the end of the belt. Aside from the initial stage of cracking, which progresses along the surface of the reinforcing element, when the reinforcing elements are arranged in parallel at equal intervals according to the conventional technique, the cracks start to grow quickly between adjacent reinforcing elements. For that reason, there is a disadvantage that they are connected to each other between the laminated layers of the constituent materials or expand rapidly toward the outside or the inside of the tire centering on the constituent materials and progress to various separations and cracks.
【００１８】これに対し、この発明にあっては、束と束
または束に属しない補強素子が混在するとき、その補強
素子と束との分散間隔が等間隔配列の場合に比しはるか
に広がるため、この分散間隔を隔てて隣接する補強素子
間で初期段階以降におけるクラックの成長が分散間隔に
応じて遅れることとなるので、その後のセパレーション
やクラックの急速な拡大は有効に抑制される。なお、補
強素子の剛性が高いと、上記した補強素子端末のつつき
による、微細なクラックが早期に発生し易いため、特に
剛性の高い補強素子、例えばスチールコードまたは有機
繊維においては芳香族ポリアミド（ケブラー）を用いる
場合に、この発明の構成材による層間セパレーションの
拡大抑制効果は、とりわけ大きくなる。On the other hand, in the present invention, when the bundles and the bundles or the reinforcing elements that do not belong to the bundles are mixed, the dispersion intervals between the reinforcing elements and the bundles are much wider than in the case of the equidistant arrangement. Therefore, the crack growth after the initial stage is delayed between the reinforcing elements adjacent to each other with the dispersion interval according to the dispersion interval, so that the subsequent separation and the rapid expansion of the crack are effectively suppressed. When the rigidity of the reinforcing element is high, minute cracks are likely to occur early due to the above-mentioned pecking of the reinforcing element end. Therefore, in the reinforcing element having particularly high rigidity, for example, steel cord or organic fiber, aromatic polyamide (Kevlar) is used. 2) is used, the effect of suppressing expansion of interlayer separation by the constituent material of the present invention becomes particularly large.
【００１９】ここで、ゴム引き層間の補強素子の総本数
のうちごく一部の補強素子のみを束として、タイヤの全
周に渡ってほぼ均整になる様な分散配置としても、束と
これに隣接する補強素子との間隔が従来の技術に従い等
間隔配列とした場合の補強素子の間隔に比べて広がるこ
とから、セパレーションやクラックの急速な拡大は抑制
される。しかしながら、その効果は著しいものとは言え
ない場合もあるから、束の区分に関しては全周の少なく
とも30％の補強素子を対象とする。こうすることで効果
も著しいものとなる。Here, even if only a part of the total number of the reinforcing elements between the rubberized layers is made into a bundle, and the reinforcing elements are distributed evenly over the entire circumference of the tire, the bundle and the bundle are also distributed. Since the distance between the adjacent reinforcing elements is wider than the distance between the reinforcing elements in the case of the regular interval arrangement according to the conventional technique, the rapid expansion of separation and cracks is suppressed. However, since the effect may not be significant, at least 30% of the total circumference of the reinforcing element should be targeted in terms of the section of the bundle. By doing so, the effect is remarkable.
【００２０】また、束内の補強素子本数を数本以内とす
るのは、この本数が多い程分散間隔は広くできて有利な
反面、束内の補強素子端末の未接着部分が連なって大き
くなって、束内に起る亀裂進展の不利を伴うことから、
せいぜい数本、好適には２〜９本の束にすることが必要
である。The number of the reinforcing elements in the bundle is set to several or less, which is advantageous because the dispersion interval can be made wider as the number of the reinforcing elements increases, but the unbonded portions of the terminals of the reinforcing elements in the bundle become large. Therefore, since there is a disadvantage of the crack growth occurring in the bundle,
It is necessary to bundle a few, preferably 2-9 bundles.
【００２１】[0021]
【実施例】タイヤサイズ11R22.5 の使用済みのトラック
・バス用タイヤを用いて、図１に示した手順に従う、タ
イヤの更生を行った。まず、使用済みタイヤのトレッド
ゴムをバフィング除去し、さらに４層のベルト３の外側
の第１層3aと第２層3bをベルト剥ぎ取り機にて除去して
台タイヤを用意した。次いで、この台タイヤに種々の材
料を貼り付けて、図３に示す構造の更生用グリーンタイ
ヤを作製した。すなわち、台タイヤのベルト第３層3c上
に、ゴムシート９を配置してから、図４に示す仕様のゴ
ム引き布５（幅155mm 、厚み1.5mm ）を貼り付け、さら
にベルト端付近およびゴム引き布５を覆うゴムシート9b
および9cを貼り付け、最後にトレッドゴム６を貼り付け
て更生用グリーンタイヤを得た。このグリーンタイヤ
を、フルモールド加硫成形に供して、再生タイヤを製造
した。[Examples] Tires were rehabilitated using used truck and bus tires having a tire size of 11R22.5 according to the procedure shown in FIG. First, the tread rubber of a used tire was removed by buffing, and the outer first layer 3a and second layer 3b of the four-layer belt 3 were removed by a belt stripping machine to prepare a base tire. Next, various materials were attached to the base tire to produce a rehabilitation green tire having the structure shown in FIG. That is, after the rubber sheet 9 is arranged on the belt third layer 3c of the base tire, the rubberized cloth 5 (width 155 mm, thickness 1.5 mm) having the specifications shown in FIG. Rubber sheet 9b covering the pulling cloth 5
And 9c were attached, and tread rubber 6 was finally attached to obtain a rehabilitation green tire. This green tire was subjected to full-mold vulcanization molding to produce a recycled tire.
【００２２】また、比較として、ベルト第３層3c上に貼
り付けるゴム引き布に、図５に示す仕様のものを用いた
他は、上記の実施例と同様に再生タイヤを製造した。Further, as a comparison, a recycled tire was manufactured in the same manner as in the above-mentioned example except that the rubberized cloth attached to the third belt layer 3c had the specifications shown in FIG.
【００２３】かくして得られた再生タイヤについて、ト
レッド発熱耐久性およびベルト耐久性を調査した。これ
らの評価結果を、表１に示す。The regenerated tire thus obtained was examined for tread heat resistance and belt durability. Table 1 shows the evaluation results.
【００２４】なお、トレッド発熱耐久性は、タイヤの内
圧を８kgf/cm2 とし、直径1.7mのドラムを使用して、速
度65km/hで荷重を２トン負荷し、一定時間毎に荷重を上
げていき、故障発生までの時間を測定して評価した。The tread heat resistance was determined by setting the tire internal pressure to 8 kgf / cm 2 , using a 1.7 m diameter drum, and applying a load of 2 tons at a speed of 65 km / h, and increasing the load at regular intervals. Then, the time until failure occurred was measured and evaluated.
【００２５】ベルト耐久性は、タイヤの内圧を８kgf/cm
2 とし、このタイヤのトレッドを15mm削り落としたもの
を形成し、次いで直径1.7mのドラムを使用し速度60km/h
で荷重を３トン負荷し、一定時間毎に、荷重負荷のオン
・オフ及びサイドフォースのオン・オフ条件下で故障発
生までの時間を測定して評価した。The belt durability is 8 kgf / cm at the tire internal pressure.
No.2 , a tread of this tire was scraped off by 15 mm to form a drum with a diameter of 1.7 m and a speed of 60 km / h.
A load of 3 tons was applied, and the time until failure occurred was measured and evaluated under constant load on / off and side force on / off conditions.
【００２６】[0026]
【表１】 [Table 1]
【００２７】さらに、リベルト作業における作業性につ
いても調査したところ、現行対比でベルト剛性度が、や
や小さくなるため、リベルト成型時、とりわけ貼り付け
労力が軽減される結果、リベルトの作業性は向上した。Further, when the workability in the rebelt work is also investigated, the belt rigidity is slightly smaller than the current one, so that the labor for attaching the rebelt is reduced during the molding of the rebelt. As a result, the workability of the rebelt is improved. .
【００２８】[0028]
【発明の効果】この発明によれば、ベルトの特に端部で
のセパレーションの原因である、ベルト材の補強素子末
端付近におけるクラックの成長進展を有効に阻むことが
できるから、耐久性に優れた更生タイヤを提供し得る。
また、補強素子の径を小さくできるため、ベルト材、ひ
いてはタイヤの軽量化を達成し、その結果、このタイヤ
を装着した車両の積載許容量を上昇することも可能であ
る。According to the present invention, it is possible to effectively prevent the growth of cracks in the vicinity of the end of the reinforcing element of the belt material, which is a cause of the separation particularly at the end portion of the belt, so that the durability is excellent. A retreaded tire can be provided.
Further, since the diameter of the reinforcing element can be reduced, it is possible to reduce the weight of the belt material and thus the tire, and as a result, it is possible to increase the load capacity of the vehicle equipped with the tire.
【図１】更生用グリーンタイヤの加工手順の説明図であ
る。FIG. 1 is an explanatory view of a procedure for processing a rehabilitation green tire.
【図２】ゴム引き布における補強素子配列の比較図であ
る。FIG. 2 is a comparative diagram of a reinforcing element array in a rubberized cloth.
【図３】更生用グリーンタイヤの構造の説明図である。FIG. 3 is an explanatory diagram of a structure of a rehabilitation green tire.
【図４】ゴム引き布の仕様を示す説明図である。FIG. 4 is an explanatory diagram showing specifications of a rubberized cloth.
【図５】ゴム引き布の仕様を示す説明図である。FIG. 5 is an explanatory diagram showing specifications of a rubberized cloth.
１ 古タイヤ ２ トレッド ３ ベルト 3a 第１層 3b 第２層 3c 第３層 3d 第４層 ４ 台タイヤ ５ ゴム引き布 ６ トレッドゴム ７ 補強素子 ８ 束８ 9a ゴムシート 9b ゴムシート 9c ゴムシート 1 Old tire 2 Tread 3 Belt 3a 1st layer 3b 2nd layer 3c 3rd layer 3d 4th layer 4 tires 5 Rubberized cloth 6 Tread rubber 7 Reinforcement element 8 Bundle 8 9a Rubber sheet 9b Rubber sheet 9c Rubber sheet
Claims (1)
にベルトの損傷部分を除去した台タイヤに、互いに並行
配列をなす所定本数の補強素子によるゴム引き布を貼り
付け、次いでトレッドゴムを貼り付けたのち、加硫成形
を行う空気入りタイヤの更生方法において、該ゴム引き
布に、その補強素子の少なくとも30％を、数本以内の束
に区分して、その束とこれに隣接する補強素子との分散
間隔を、上記所定本数の補強素子をゴム引き布内で等間
隔に配列した場合に比べて広くしたものを用いることを
特徴とする、空気入りタイヤの更生方法。1. A worn tread rubber of a used tire and a base tire from which a damaged portion of a belt has been removed are attached with a rubberized cloth having a predetermined number of reinforcing elements arranged in parallel with each other, and then a tread rubber is attached. Then, in the method of rehabilitating a pneumatic tire to be vulcanized and molded, in the rubberized cloth, at least 30% of the reinforcing element is divided into a bundle of several pieces or less, and the bundle and a reinforcing element adjacent thereto. The method of rehabilitating a pneumatic tire is characterized in that the dispersion intervals of the above are widened as compared with the case where the predetermined number of reinforcing elements are arranged at equal intervals in a rubberized cloth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8101108A JPH09286206A (en) | 1996-04-23 | 1996-04-23 | Retreading method for pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8101108A JPH09286206A (en) | 1996-04-23 | 1996-04-23 | Retreading method for pneumatic tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09286206A true JPH09286206A (en) | 1997-11-04 |
Family
ID=14291885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8101108A Withdrawn JPH09286206A (en) | 1996-04-23 | 1996-04-23 | Retreading method for pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09286206A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010133796A (en) * | 2008-12-03 | 2010-06-17 | Sumitomo Rubber Ind Ltd | Durability testing method for pneumatic tire |
| JP2023077089A (en) * | 2021-11-24 | 2023-06-05 | 株式会社ブリヂストン | Retreaded tire |
-
1996
- 1996-04-23 JP JP8101108A patent/JPH09286206A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010133796A (en) * | 2008-12-03 | 2010-06-17 | Sumitomo Rubber Ind Ltd | Durability testing method for pneumatic tire |
| JP2023077089A (en) * | 2021-11-24 | 2023-06-05 | 株式会社ブリヂストン | Retreaded tire |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A761 | Written withdrawal of application |
Free format text: JAPANESE INTERMEDIATE CODE: A761 Effective date: 20040415 |