JPS6059858B2 - Method for manufacturing a pneumatic tire with a double-layer tread - Google Patents
Method for manufacturing a pneumatic tire with a double-layer treadInfo
- Publication number
- JPS6059858B2 JPS6059858B2 JP55078477A JP7847780A JPS6059858B2 JP S6059858 B2 JPS6059858 B2 JP S6059858B2 JP 55078477 A JP55078477 A JP 55078477A JP 7847780 A JP7847780 A JP 7847780A JP S6059858 B2 JPS6059858 B2 JP S6059858B2
- Authority
- JP
- Japan
- Prior art keywords
- tread rubber
- rubber
- manufacturing
- paste
- pneumatic tire
- 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
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 238000000034 method Methods 0.000 title claims description 6
- 229920001971 elastomer Polymers 0.000 claims description 50
- 239000005060 rubber Substances 0.000 claims description 50
- 238000010894 electron beam technology Methods 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 3
- 244000043261 Hevea brasiliensis Species 0.000 claims description 2
- 229920003052 natural elastomer Polymers 0.000 claims description 2
- 229920001194 natural rubber Polymers 0.000 claims description 2
- 229920002857 polybutadiene Polymers 0.000 claims description 2
- 229920003051 synthetic elastomer Polymers 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 description 11
- 238000004073 vulcanization Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 240000007124 Brassica oleracea Species 0.000 description 1
- 235000003899 Brassica oleracea var acephala Nutrition 0.000 description 1
- 235000011301 Brassica oleracea var capitata Nutrition 0.000 description 1
- 235000001169 Brassica oleracea var oleracea Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
Landscapes
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Tyre Moulding (AREA)
- Tires In General (AREA)
Description
【発明の詳細な説明】 本発明は低燃費用空気入りタイヤの製造方法に関する。[Detailed description of the invention] The present invention relates to a method for manufacturing a pneumatic tire for low fuel consumption.
自動車業界における自動車の低燃費化が強く望まれてい
る現状下、タイヤ業界において低燃費用タイヤ、特に低
転動抵抗のタイヤの開発の要請が強い。発明者らは低転
動抵抗を有するタイヤとしてトレツドを２層構造とする
技術を提案した（特願昭５４−１４３７３９）。かかる
技術によつてタイヤの転動抵抗の大幅な改善が達成でき
るが、かかる２層構造トレツドのタイヤは製造上次の問
題点があった。即ち該タイヤの製造は、キヤツブトレツ
ドゴム及びペーストレッドゴムを貼り合わせトレツドを
構成しこれを通常の方法で他の構成要素とともに組合せ
成型し加硫するが、加硫の際トレツド溝を形成する為の
金型凸部によつてトレツドゴムは局部的に内方に押しや
られその結果加硫タイヤは第１図に示される如く、キヤ
ツプトレツドゴムとペーストレッドゴム境界面■が波打
現象を生ずる。ここで境界面■の上端部■ａがウエアー
ィンデイケーターＩの溝高さを越える場合、タイヤの寿
命を制限することになる為波打ちの振幅をこの範囲に抑
えることが必要であり、これによつてペーストレッドゴ
ムのキヤツプトレツドゴムに対する容積比の増加を可能
としその結果、転動抵抗は一層の低減を達成することが
できる。然して本発明は前記波打現象を防止し転動抵抗
を低減した空気入りタイヤの製造方法を提供することを
目的とＩする。本発明はトレツドゴムがキヤツプトレツ
ドゴムとペーストレッドゴムの二層構造からなる空気入
りタイヤの製造方法おいて、ペーストレッドゴムの片側
にのみ電子線を照射し、該ペーストレッド；ゴムの電子
線を照射した側にキヤツプトレツドゴムを貼り合わせて
成型、加硫することを特徴とする空気入りタイヤの製造
方法である。BACKGROUND OF THE INVENTION Under the current situation where the automobile industry strongly desires to make automobiles more fuel efficient, there is a strong demand in the tire industry for the development of fuel-efficient tires, especially tires with low rolling resistance. The inventors have proposed a technology in which the tread has a two-layer structure as a tire with low rolling resistance (Japanese Patent Application No. 143739/1982). Although such technology can significantly improve the rolling resistance of tires, such two-layer tread tires have the following problems in manufacturing. That is, in manufacturing the tire, a cabbage tread rubber and a paste tread rubber are laminated together to form a tread, which is then molded together with other constituent elements in a conventional manner and vulcanized. During vulcanization, tread grooves are formed. The tread rubber is locally pushed inward by the protrusions of the mold, and as a result, the vulcanized tire exhibits a waving phenomenon at the interface between the cap tread rubber and the paste tread rubber, as shown in Figure 1. arise. If the upper end of the boundary surface ■a exceeds the groove height of the wear indicator I, it will limit the life of the tire, so it is necessary to suppress the amplitude of the waving within this range. This makes it possible to increase the volume ratio of the paste tread rubber to the cap tread rubber, and as a result, further reduction in rolling resistance can be achieved. However, an object of the present invention is to provide a method for manufacturing a pneumatic tire that prevents the above-mentioned waving phenomenon and reduces rolling resistance. The present invention is a method for manufacturing a pneumatic tire in which the tread rubber has a two-layer structure of cap tread rubber and paste tread rubber, in which only one side of the paste tread rubber is irradiated with an electron beam, and the paste tread; rubber is irradiated with an electron beam. This method of manufacturing a pneumatic tire is characterized by bonding a cap tread rubber to the irradiated side, molding it, and vulcanizing it.
まず本発明の製造方法が適用される空気入リタイアのト
レツドゴムはペーストレッドゴムとキヤップトレツドゴ
ムの二層構造で構成される。First, the tread rubber of a pneumatic retirement to which the manufacturing method of the present invention is applied has a two-layer structure of paste tread rubber and cap tread rubber.
かかる構成に基づきペーストレッドゴムには低転動特性
を、一方キヤツプトレツドゴムには耐摩耗、ウェットス
キッド性等をそれぞれ分担せしめ二律背反するこれらの
特性を総合的に向上することができる。ここでペースト
レッドゴムは低転動抵抗を考慮して天然ゴム、合成ポリ
イソプレンゴム、又はポリブタジエンゴムの単独又はこ
れらの混合をゴム成分中少なくとも５喧量部含有する。
更に前記ペーストレッドゴムは平均粒子径が３５１ｎμ
以下のカーボンブラックを３０〜５踵量部配合されるこ
とが好ましい。前記ペーストレッドゴムは成型に先立ち
３Ｍｒａｄ〜２０Ｍｒａｄの範囲の電子線照射を行ない
部分的に加硫する。Based on this structure, the paste tread rubber is given low rolling properties, while the cap tread rubber is given wear resistance, wet skid properties, etc., and these contradictory properties can be comprehensively improved. Here, in consideration of low rolling resistance, the paste red rubber contains at least 5 parts of natural rubber, synthetic polyisoprene rubber, or polybutadiene rubber alone or in a mixture thereof in the rubber component.
Further, the paste red rubber has an average particle diameter of 351 nμ.
It is preferable that 30 to 5 parts of the following carbon black be blended. Prior to molding, the paste red rubber is partially vulcanized by electron beam irradiation in the range of 3 Mrad to 20 Mrad.
かかる電子線照射により加硫後の損失弾性率Ｅ″の値を
小さくするとともに、加硫タイヤのキヤツプトレツドゴ
ムとペーストレッドゴムの境界面の波打現象を防止する
ことができる。電一子線照射量が３Ｍｒａｄ以下の楊合
、上記効果は望めない。一方２０Ｍｒａｄ以上の場合、
加硫後の基本的物理特性が低下する。次に電子線照射を
行うペーストレッドゴムの厚さは１ｗ！ｔ〜２０Ｔ１ａ
の範囲のものが好ましく特に２Ｔ！ｇ！ｔ〜１『の範囲
のものが好まし・い。厚さが２０ｍを越えると電子線透
過が十分でない為不適当である。更に電子線照射をキヤ
ツプトレツドゴムと隣接する片側のみ照射するのはキヤ
ツプトレツドゴムとペーストレッドゴム境界の波打現象
の解消が該境界面での密着性を犠性にすることなく達成
できるからであり、これを両側に照射した場合、ブレー
カープライ又はカーカスプライと隣接する側の接着性の
低下が生ずる。然して本発明の空気入リタイアの製造方
法は前述の如く予めペーストレッドゴムに電子線を照射
し部分的に加硫した後、照射した側にキヤツプトレツド
ゴムを貼り合わせてトレンドを構成する。Such electron beam irradiation can reduce the value of the loss modulus E'' after vulcanization, and can also prevent the waving phenomenon at the interface between the cap tread rubber and paste tread rubber of the vulcanized tire.Denko If the radiation dose is less than 3 Mrad, the above effect cannot be expected.On the other hand, if the radiation dose is more than 20 Mrad,
The basic physical properties after vulcanization are degraded. Next, the thickness of the paste red rubber to be irradiated with electron beam is 1W! t~20T1a
Preferably, it is in the range of 2T! g! A range of t to 1' is preferable. If the thickness exceeds 20 m, it is not suitable because electron beam transmission is insufficient. Furthermore, by irradiating the electron beam only on one side adjacent to the cap tread rubber, it is possible to eliminate the waving phenomenon at the boundary between the cap tread rubber and the paste tread rubber without sacrificing the adhesion at the interface. If both sides are irradiated with this, the adhesion on the side adjacent to the breaker ply or carcass ply will decrease. However, the method of manufacturing the pneumatic retirement according to the present invention is to construct a trend by irradiating paste tread rubber in advance with an electron beam to partially vulcanize it as described above, and then bonding cap tread rubber to the irradiated side.
しかる後タイヤの他の構成要素と通常の方法で組合わせ
て成型、加硫する。かくして製造された空気入リタイア
はキヤツプトレツドゴムとペーストレッドゴム境界面で
の波打現象が解消されるとともに転動抵抗が改善される
。以下実施例にしたがつて本発明を説明する。Thereafter, it is combined with other tire components in a conventional manner, molded, and vulcanized. The pneumatic retirement manufactured in this way eliminates the waving phenomenon at the interface between the cap tread rubber and the paste tread rubber, and improves rolling resistance. The present invention will be explained below with reference to Examples.
実施例１タイヤサイズが１６５ＳＲ１３で２枚のポリエ
ステルカーカス及び２枚のスチールコードブレーカーの
ラジアルタイヤについてトレツドゴムとして第１表の配
合を用いるとともに第２表で示す内容で本発明の実施例
及び比較例のタイヤをそれぞれ製造し転動抵抗、キヤツ
プトレツドゴムとペーストレッドゴムの波打現象を評価
した。Example 1 For a radial tire with a tire size of 165SR13, two polyester carcass and two steel cord breakers, the formulation shown in Table 1 was used as the tread rubber, and the contents shown in Table 2 were used for the Examples and Comparative Examples of the present invention. Each tire was manufactured and the rolling resistance and waviness of cap tread rubber and paste tread rubber were evaluated.
尚前記タイヤの加硫はいずれも通常の条件下で行なつた
。（イ）転動抵抗指数第２表から明らかな如く本発明の
製造方法に係る空気入リタイア（実施例１〜３）は単一
トレツドのもの（比較例１）に比較し転動抵抗が１２〜
１５％改善されており、更に２層構造トレンドで電子線
を照射しないもの（比較例２，（口）キャップ／ペース
トレッドゴム境界面での波打現象第２表から明らかな如
く電子線照射量とともに境界面振幅は小さくなり波打ち
現象は改善されるが照射量が２０Ｍｒａｄ（実施例３）
を越える粘着性か低下するとともに基本的物理特性の低
下も認められる。It should be noted that the vulcanization of all of the above tires was carried out under normal conditions. (B) Rolling Resistance Index As is clear from Table 2, the pneumatic retires (Examples 1 to 3) according to the manufacturing method of the present invention have a rolling resistance of 12% compared to the single tread tire (Comparative Example 1). ~
It has been improved by 15%, and it has a two-layer structure trend and is not irradiated with electron beam (Comparative Example 2, (opening) Waving phenomenon at the cap/paste tread rubber interface. As is clear from Table 2, the amount of electron beam irradiation is At the same time, the boundary surface amplitude becomes smaller and the waving phenomenon is improved, but the irradiation dose is 20 Mrad (Example 3)
A decrease in tackiness and a decrease in basic physical properties are also observed.
（ハ）ペーストレッドゴムの粘弾性特性
第１表の配合Ｂについて１５００Ｃ２５分間ブレス加硫
して１００ｍ×５『刈．２醜のスラブ試験片を作成し粘
弾特性及び基本的物理特性を測定し、その結果を第３表
に示す。(c) Viscoelastic properties of paste red rubber For formulation B in Table 1, press vulcanization was carried out at 1500C for 25 minutes to obtain a 100m x 5" cutting. 2. Slab test pieces were prepared and their viscoelastic properties and basic physical properties were measured, and the results are shown in Table 3.
ここで粘弾性特性は岩本製作所製粘弾性スペクトロメー
ターて温度７０℃初期歪１０％、振幅２％、振動数１０
Ｈｚで測定した。表から明らかな如く電子線量を増加す
れは損失失弾性率Ｅ″は減少するが照射線量を増加する
と逆に増加する傾向にある。Here, the viscoelastic properties were measured using a viscoelastic spectrometer manufactured by Iwamoto Seisakusho at a temperature of 70°C, an initial strain of 10%, an amplitude of 2%, and a frequency of 10.
Measured in Hz. As is clear from the table, as the electron dose increases, the loss elasticity E'' decreases, but as the irradiation dose increases, it tends to increase.
第１図は２層構造トレンドの部分断面図、第２図は本発
明の製造方法によるタイヤの断面図、第３図は第２図の
トレンド部の一部拡大図である。
１・・・・・・ビードワイヤ、２・・・・・・カーカス
、３・・・・ブレーカー、４・・・・・・サイドウォー
ル、５・・・・・・トレンド、６・・・・・・トレンド
溝、Ａ・・・・・・キヤツプトレツドゴム、Ｂ・・・・
・・ペーストレッドゴム、Ｉ・・・・・・ウエアーイン
デイケーターの位置、■・・・・・・２層トレンドの境
界面、Ｌ・・・・・・境界面の振幅。FIG. 1 is a partial sectional view of a two-layer structure trend, FIG. 2 is a sectional view of a tire manufactured by the manufacturing method of the present invention, and FIG. 3 is a partially enlarged view of the trend portion of FIG. 2. 1...Bead wire, 2...Carcass, 3...Breaker, 4...Side wall, 5...Trend, 6...・Trend groove, A... Cap lead rubber, B...
... Paste red rubber, I ... Wear indicator position, ■ ... Boundary surface of two-layer trend, L ... Boundary surface amplitude.
Claims (1)
ッドゴムの二層構造よりなる空気入りタイヤの製造方法
において、予めベーストレッドゴムの片側にのみ電子線
を照射し、該ベーストレッドゴムの電子線を照射した側
にキヤツプトレッドゴムを貼り合せて成型、加硫するこ
とを特徴とする空気入りタイヤの製造方法。 ２ ベーストレッドゴムは天然ゴム、合成ポリイソプレ
ンゴム又はポリブタジエンゴムの単独又はそれらの少な
くとも２種類の混合をゴム成分中少なくとも５重量部を
含有する特許請求の範囲第１項記載の製造方法。 ３ ベーストレッドゴムの厚さは１ｍｍ〜２０ｍｍの範
囲である特許請求の範囲第１項及び第２項記載の製造方
法。 ４ 電子線照射量は３〜２０ＭＲａｄの範囲である特許
請求の範囲第１項乃至第３項記載の製造方法。[Claims] 1. In a method for manufacturing a pneumatic tire whose tread rubber has a two-layer structure of cap tread rubber and base tread rubber, only one side of the base tread rubber is irradiated with an electron beam in advance, and the base tread rubber is A method for manufacturing a pneumatic tire, characterized by bonding cap tread rubber to the side irradiated with electron beams, molding, and vulcanizing. 2. The manufacturing method according to claim 1, wherein the base tread rubber contains at least 5 parts by weight of natural rubber, synthetic polyisoprene rubber, or polybutadiene rubber alone or a mixture of at least two thereof in the rubber component. 3. The manufacturing method according to claims 1 and 2, wherein the base tread rubber has a thickness in the range of 1 mm to 20 mm. 4. The manufacturing method according to claims 1 to 3, wherein the electron beam irradiation amount is in the range of 3 to 20 MRad.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55078477A JPS6059858B2 (en) | 1980-06-10 | 1980-06-10 | Method for manufacturing a pneumatic tire with a double-layer tread |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55078477A JPS6059858B2 (en) | 1980-06-10 | 1980-06-10 | Method for manufacturing a pneumatic tire with a double-layer tread |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS574756A JPS574756A (en) | 1982-01-11 |
| JPS6059858B2 true JPS6059858B2 (en) | 1985-12-27 |
Family
ID=13663083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55078477A Expired JPS6059858B2 (en) | 1980-06-10 | 1980-06-10 | Method for manufacturing a pneumatic tire with a double-layer tread |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6059858B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4756782A (en) * | 1986-05-06 | 1988-07-12 | Seiberling Theophilus K | Method for retreading tires |
| JPS6424732A (en) * | 1987-07-22 | 1989-01-26 | Yokohama Rubber Co Ltd | Preparation of radial tire for passenger car |
| JP5395527B2 (en) * | 2009-06-12 | 2014-01-22 | 住友ゴム工業株式会社 | Pneumatic tire |
-
1980
- 1980-06-10 JP JP55078477A patent/JPS6059858B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS574756A (en) | 1982-01-11 |
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