JPH07102627B2 - Joint tape for inner liner of tubeless tire - Google Patents

Joint tape for inner liner of tubeless tire

Info

Publication number
JPH07102627B2
JPH07102627B2 JP3007868A JP786891A JPH07102627B2 JP H07102627 B2 JPH07102627 B2 JP H07102627B2 JP 3007868 A JP3007868 A JP 3007868A JP 786891 A JP786891 A JP 786891A JP H07102627 B2 JPH07102627 B2 JP H07102627B2
Authority
JP
Japan
Prior art keywords
joint
joint tape
inner liner
tire
tape
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.)
Expired - Lifetime
Application number
JP3007868A
Other languages
Japanese (ja)
Other versions
JPH04247933A (en
Inventor
洋 松本
一彦 末吉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyo Tire Corp
Original Assignee
Toyo Tire and Rubber Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyo Tire and Rubber Co Ltd filed Critical Toyo Tire and Rubber Co Ltd
Priority to JP3007868A priority Critical patent/JPH07102627B2/en
Publication of JPH04247933A publication Critical patent/JPH04247933A/en
Publication of JPH07102627B2 publication Critical patent/JPH07102627B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0681—Parts of pneumatic tyres; accessories, auxiliary operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C5/00—Inflatable pneumatic tyres or inner tubes
    • B60C5/12—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim
    • B60C5/14—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre
    • B60C5/142—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre provided partially, i.e. not covering the whole inner wall
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0681—Parts of pneumatic tyres; accessories, auxiliary operations
    • B29D2030/0682—Inner liners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C5/00—Inflatable pneumatic tyres or inner tubes
    • B60C5/12—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim
    • B60C5/14—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre
    • B60C2005/147—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre characterised by the joint or splice

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】この発明はチューブレスタイヤの
インナーライナー用ジョイントテープの改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a joint tape for an inner liner of a tubeless tire.

【０００２】[0002]

【従来の技術】従来より、大型トラック等のチューブレ
スタイヤでは、タイヤ内面に配したインナーライナーの
ジョイント部を補強するため、該ジョイント部に通常
０．５〜０．６mm程度のジョイントテープを貼り付けて
加硫成形していた。2. Description of the Related Art Conventionally, in a tubeless tire for a large truck or the like, a joint tape of about 0.5 to 0.6 mm is usually attached to the joint portion of the inner liner arranged on the inner surface of the tire to reinforce the joint portion. Was vulcanized and molded.

【０００３】[0003]

【発明が解決しようとする課題】しかしインナーライナ
ー表面には一般に加硫後ブラダーからの離型を良くする
ため離型剤を吹き付けるため、この離型剤が上記インナ
ーライナーのジョイントテープ両端の段差部分に多少残
留することがあり、加硫時にタイヤ内面から圧力かけた
際、この離型剤が段差部の圧縮に伴って段差部からジョ
イントテープの貼り付け面内部にかみ込まれ、その部分
から剥がれたり、クラックが発生するなど好ましくなか
った。However, since a release agent is generally sprayed on the surface of the inner liner to improve the release from the bladder after vulcanization, the release agent is applied to the stepped portions at both ends of the joint tape of the inner liner. When a pressure is applied from the inner surface of the tire during vulcanization, this mold release agent is caught in the joint surface of the joint tape from the step due to the compression of the step and peels off from that part. And cracks were generated, which was not preferable.

【０００４】従って実際は離型剤を吹き付ける際、離型
剤遮蔽用治具としてのプロテクターを用い、このプロテ
クターでジョイントテープ部分を覆って離型剤を吹き付
け、その後取り去って加硫成形していた。だがこのプロ
テクターを用いて離型剤を吹き付けることは手間がかか
り、また離型剤に対する遮蔽効果の点でも必ずしも十分
であるとはいい難い。Therefore, in actuality, when spraying the release agent, a protector was used as a jig for shielding the release agent, the joint tape portion was covered with this protector, the release agent was sprayed, and then removed and vulcanized and molded. However, it is difficult to spray the release agent using this protector, and it is not always sufficient in terms of the shielding effect against the release agent.

【０００５】この発明の目的はたとえインナーライナー
表面にプロテクターを用いることなく直接離型剤を吹き
付けても、剥がれたり、クラックが発生したりすること
がなく、しかも補強効果の点でも良好であるチューブレ
スタイヤのインナーライナー用ジョイントテープを提供
する点にある。The object of the present invention is to prevent the peeling and cracking of the inner liner even if the release agent is directly sprayed on the surface of the inner liner without using a protector. The point is to provide a joint tape for a tire inner liner.

【０００６】[0006]

【課題を解決するための手段】上記目的を達成するため
鋭意検討の結果、従来と比べて厚みがかなり薄いジョイ
ントテープであれば、離型剤のかみ込みをかなり押さえ
ることができることを見出だした。しかし薄くしすぎる
とジョイント部の補強効果が低下する。そこでこの発明
はかかる補強効果の低下をモジュラスの増大で補う構成
とし、その両者の最適範囲を検討した結果、ジョイント
テープの厚みａ(mm)と加硫前の２００％モジュラスｍ
（kgf/cm2 ) を下式の範囲とすれば好適であることを見
出だした。 ａ≦０．２ ２．５≦ａ・ｍ≦１５Means for Solving the Problems As a result of intensive studies to achieve the above object, it was found that a joint tape having a considerably smaller thickness than the conventional one can considerably suppress the biting of the release agent. . However, if it is made too thin, the reinforcing effect of the joint portion will be reduced. Therefore, the present invention has a structure in which the decrease in the reinforcing effect is compensated by increasing the modulus, and the optimum range of both is examined. As a result, the thickness a (mm) of the joint tape and the 200% modulus m before vulcanization m
It has been found that it is preferable to set (kgf / cm 2 ) in the range of the following formula. a ≦ 0.2 2.5 ≦ a · m ≦ 15

【０００７】ジョイントテープの厚みａが０．２より大
きいと、離型剤のかみ込みをおさえる程度が従来のジョ
イントテープとあまり大差がない。ただジョイントテー
プの取扱いの容易化を特に考慮するならばその厚みａは
０．１mmより大きい方が好ましい。一方、ジョイントテ
ープの厚みａが０．２より少ない場合でも、加硫前の２
００％モジュラスｍとの積が２．５より少ないと、モジ
ュラスが低いためジョイント部の補強効果が乏しくな
る。反対にジョイントテープの厚みａと加硫前の２００
％モジュラスｍとの積が１５より大きいと、タイヤ成型
時にテープの伸びがグリーンタイヤの伸びについていか
ないため、テープ剥がれなどが生じ易くなる。なおモジ
ュラスを加硫前の２００％モジュラス、すなわち２００
％グリーンモジュラスとしているのは、タイヤ成型時に
インナーライナーが約１５０〜２５０％程度伸張される
ことによる。When the thickness a of the joint tape is larger than 0.2, the extent to which the release agent is held is not so different from the conventional joint tape. However, it is preferable that the thickness a is larger than 0.1 mm in view of easy handling of the joint tape. On the other hand, even if the thickness a of the joint tape is less than 0.2,
If the product with the 00% modulus m is less than 2.5, the modulus is low and the joint reinforcing effect is poor. On the contrary, the thickness a of the joint tape is 200
If the product of the% modulus m is larger than 15, the elongation of the tape does not keep up with the elongation of the green tire during tire molding, so that tape peeling or the like is likely to occur. The modulus is 200% modulus before vulcanization, that is, 200
The reason why the% green modulus is set is that the inner liner is stretched by about 150 to 250% during tire molding.

【０００８】ジョイントテープについては特に限定され
るものではなく、例えばＩＲフィルム等一定のゴム組成
物ないしゴムと架橋する物質が使用できる。The joint tape is not particularly limited, and for example, a certain rubber composition such as an IR film or a substance that crosslinks with rubber can be used.

【０００９】[0009]

【作用】この発明はジョイントテープの加硫前の２００
％モジュラスｍと厚みの最適化を図ることにより、補強
効果を保ちつつ、同時にプロテクターなしでテープ端の
剥がれやクラックの発生を防ぐことができる。The present invention is applied to the joint tape 200 before vulcanization.
By optimizing the% modulus m and the thickness, it is possible to prevent the peeling or cracking of the tape end without a protector while maintaining the reinforcing effect.

【００１０】[0010]

【実施例】図１はこの発明の一実施例に係るジョイント
テープの使用状態を示す拡大断面図である。図において
１はインナーライナーであり、２は該インナーライナー
１の両端部を突き合わせてなるジョイント部、３はジョ
イント部の表面に貼り付けられたジョイントテープであ
る。なお４はタイヤ本体側、５はタイヤ内面側を示して
いる。FIG. 1 is an enlarged sectional view showing a use state of a joint tape according to an embodiment of the present invention. In the figure, 1 is an inner liner, 2 is a joint part formed by abutting both ends of the inner liner 3, and 3 is a joint tape attached to the surface of the joint part. In addition, 4 is a tire main body side, 5 has shown the tire inner surface side.

【００１１】従来のタイヤでは、離型剤がこのジョイン
トテープ両端の段差部分３ａ及び３ｂに残留し、加硫時
にタイヤ内面から圧力かけた際、この離型剤が段差部分
の圧縮に伴って段差部分３ａ及び３ｂからジョイントテ
ープの貼り付け面内部にかみ込まれるものである。しか
し本発明ではそのおそれはない。In the conventional tire, the release agent remains on the step portions 3a and 3b at both ends of the joint tape, and when pressure is applied from the inner surface of the tire at the time of vulcanization, the release agent causes a step due to the compression of the step portion. It is to be intruded from the portions 3a and 3b into the inside of the attachment surface of the joint tape. However, in the present invention, there is no such fear.

【００１２】以下、タイヤサイズ１１Ｒ２２．５ １４
ＰＲである実施例及び比較例のタイヤを実際に試作して
その点を評価した。表１はその結果を示している。な
お、上記タイヤはいずれもプロテクターをジョイント部
にあてずに離型剤を直接ジョイント部に塗布して成型し
ている。表１中、ａはジョイントテープの厚み(mm)、ｍ
は加硫前の２００％モジュラス（kgf/cm2 ) を示すこと
は前記の通りである。Hereinafter, tire size 11R22.5 14
The PR tires of Examples and Comparative Examples were actually prototyped and the points were evaluated. Table 1 shows the result. Each of the above tires is molded by directly applying a release agent to the joint portion without applying a protector to the joint portion. In Table 1, a is the thickness (mm) of the joint tape, m
As described above, indicates a 200% modulus (kgf / cm 2 ) before vulcanization.

【００１３】[0013]

【表１】 [Table 1]

【００１４】表１中、タイヤ成型性評価はタイヤ１０本
を成型した際の不具合本数をもって表し、○が０本、◇
が１本、◆が２本、×が５本以上であることを示してい
る。不具合の内容は、比較例１及び２ではジョイント開
きが発生した。実施例７及び８は厚みが薄すぎるため取
扱いの点で若干問題であったが、タイヤ成型性及び実車
走行性能の点では他の実施例同様良好であった。比較例
４、５、６、７、８及び９ではジョイントテープの剥が
れが生じた。In Table 1, the tire moldability evaluation is represented by the number of defective tires when 10 tires are molded.
Indicates that the number is 1, the number of ◆ is 2, and the number of x is 5 or more. Regarding the content of the defect, in Comparative Examples 1 and 2, joint opening occurred. In Examples 7 and 8, the thickness was too small, which caused some problems in handling, but the tire moldability and the running performance of the actual vehicle were good as in the other Examples. In Comparative Examples 4, 5, 6, 7, 8 and 9, peeling of the joint tape occurred.

【００１５】タイヤ実走評価は、実車１０万km走行後の
インナーライナーのジョイント部及びジョイントテープ
端（段差部分）の状態をタイヤ８本で評価している。ジ
ョイント部では○がジョイントクラック発生本数が０
本、×が２本以上あることを示し、ジョイントテープ端
では○がジョイントテープ端クラック発生本数が０本、
×が３本以上あることを示している。なおジョイントク
ラックはタイヤのバットレス部付近の内面に特に発生し
ており、さらに実走すればエアー漏れ、バーストが生じ
る原因となると考えられる。In the tire actual running evaluation, the state of the joint portion and joint tape end (step portion) of the inner liner after running 100,000 km of the actual vehicle is evaluated with eight tires. ○ indicates that the number of joint cracks is 0
, X indicates that there are two or more, and ○ indicates that the number of cracks at the joint tape end is 0 at the joint tape end,
It is shown that there are three or more x. It should be noted that the joint cracks are particularly generated on the inner surface near the buttress portion of the tire, and it is considered that air leakage and bursts will be caused if the vehicle further runs.

【００１６】表１及び上記の記載から理解できる様に、
ａ及びａ・ｍが一定範囲にある本発明の実施例では、タ
イヤ成型性及び実走評価のいずれの点でも良好であるこ
とが認められる。なお比較例１及び２でジョイント開き
が発生したのは、ａ・ｍが低く、ジョイント部の補強性
が低下しているためと考えられる。また、比較例４、
５、６、７、８及び９でジョイントテープの剥がれが生
じたのは、ａ・ｍが高すぎるため成型時にジョイントテ
ープの伸びがタイヤの伸びに追従していかなかったこと
が原因であると考えられる。なおこの発明は上記の実施
例に限定されないことはいうまでもない。As can be understood from Table 1 and the above description,
In the examples of the present invention in which a and a · m are within a certain range, it is recognized that the tire moldability and the actual running evaluation are good. It is considered that the reason why the joint opening occurred in Comparative Examples 1 and 2 was that the a · m was low and the reinforcing property of the joint portion was deteriorated. In addition, Comparative Example 4,
The peeling of the joint tape in Nos. 5, 6, 7, 8 and 9 was caused by the fact that the elongation of the joint tape did not follow the elongation of the tire at the time of molding because a · m was too high. Conceivable. Needless to say, the present invention is not limited to the above embodiments.

【００１７】[0017]

【発明の効果】以上の通り、この発明はジョイントテー
プの加硫前の２００％モジュラスｍと厚みａの最適化を
図ったので、インナーライナーのジョイント部に対する
補強効果を十分保ちつつ、同時に離型剤によるテープ端
の剥がれやクラックの発生を防ぐことができ、耐久性に
すぐれたタイヤとすることができた。しかもプロテクタ
ーなしで離型剤を塗布し、タイヤ成型できるので、従来
に比して生産性を著しく向上することができた。As described above, the present invention has optimized the 200% modulus m and the thickness a of the joint tape before vulcanization. It was possible to prevent peeling and cracking of the tape edge due to the agent, and it was possible to make a tire with excellent durability. In addition, since a mold release agent can be applied to form a tire without a protector, the productivity can be remarkably improved as compared with the conventional case.

【図面の簡単な説明】[Brief description of drawings]

【図１】この発明の一実施例に係るジョイントテープの
使用状態を示す拡大断面図である。FIG. 1 is an enlarged cross-sectional view showing a use state of a joint tape according to an embodiment of the present invention.

【符号の説明】[Explanation of symbols]

１ インナーライナー ２ ジョイント部 ３ ジョイントテープ ａ 厚み 1 Inner liner 2 Joint part 3 Joint tape a Thickness

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】チューブレスタイヤのインナーライナーの
ジョイント部に貼り付けるジョイントテープにおいて、
その厚みａ(mm)及び加硫前の２００％モジュラスｍ（kg
f/cm2 ) を下式の範囲とすることを特徴とするチューブ
レスタイヤのインナーライナー用ジョイントテープ。 ａ≦０．２ ２．５≦ａ・ｍ≦１５1. A joint tape to be attached to a joint portion of an inner liner of a tubeless tire,
Its thickness a (mm) and 200% modulus before vulcanization m (kg
The joint tape for the inner liner of tubeless tires, characterized in that f / cm 2 ) is in the range of the following formula. a ≦ 0.2 2.5 ≦ a · m ≦ 15
JP3007868A 1991-01-25 1991-01-25 Joint tape for inner liner of tubeless tire Expired - Lifetime JPH07102627B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3007868A JPH07102627B2 (en) 1991-01-25 1991-01-25 Joint tape for inner liner of tubeless tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3007868A JPH07102627B2 (en) 1991-01-25 1991-01-25 Joint tape for inner liner of tubeless tire

Publications (2)

Publication Number Publication Date
JPH04247933A JPH04247933A (en) 1992-09-03
JPH07102627B2 true JPH07102627B2 (en) 1995-11-08

Family

ID=11677618

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3007868A Expired - Lifetime JPH07102627B2 (en) 1991-01-25 1991-01-25 Joint tape for inner liner of tubeless tire

Country Status (1)

Country Link
JP (1) JPH07102627B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4725416B2 (en) 2006-05-26 2011-07-13 横浜ゴム株式会社 Pneumatic tire manufacturing method
JP5691317B2 (en) * 2010-09-09 2015-04-01 横浜ゴム株式会社 tire

Also Published As

Publication number Publication date
JPH04247933A (en) 1992-09-03

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Effective date: 19960514