JP2009255881A - Pneumatic tire and method of manufacturing the same - Google Patents

Pneumatic tire and method of manufacturing the same Download PDF

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JP2009255881A
JP2009255881A JP2008110412A JP2008110412A JP2009255881A JP 2009255881 A JP2009255881 A JP 2009255881A JP 2008110412 A JP2008110412 A JP 2008110412A JP 2008110412 A JP2008110412 A JP 2008110412A JP 2009255881 A JP2009255881 A JP 2009255881A
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tire
thermoplastic resin
resin film
film
rubber
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JP5225735B2 (en
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Norihiko Nakamura
典彦 中村
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a pneumatic tire improved in aesthetic appearance by changing the reflection of light on the surface of the side section while eliminating defects during the manufacture of the tire. <P>SOLUTION: A thermoplastic resin film 10 having a rubber component mixed therein is pasted on the outer surface of the side section of an unvulcanized tire. The unvulcanized tire is vulcanized/molded with the thermoplastic resin film pasted thereon. The thermoplastic resin film 10 is peelably pasted on the outer surface of the tire side section 3. The thermoplastic resin film is desirably a smooth one having a melting point of 180°C or higher and a thickness of 10-200 μm. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、空気入りタイヤに関し、より詳細にはタイヤ外表面の光の反射を変えることで外観を向上させた空気入りタイヤ、及びその製造方法に関する。   The present invention relates to a pneumatic tire, and more particularly to a pneumatic tire whose appearance is improved by changing the reflection of light on the outer surface of the tire, and a method for manufacturing the same.

一般に、空気入りタイヤの外観、特にサイド部の外観を向上することは、空気入りタイヤの商品価値を高める上で重要であり、従来より種々の提案がなされている。例えば、下記特許文献1には、トレッド部やサイド部等のタイヤ本体を構成するゴム組成物に、ジアミン系老化防止剤とともに、特定の紫外線吸収剤を配合することにより、経時的な変色を防止することが開示されている。また、下記特許文献2には、製品タイヤの表面に塗布することで光沢を付与する表面保護艶だし剤が開示されている。   In general, improving the appearance of a pneumatic tire, particularly the appearance of the side portion, is important for increasing the commercial value of the pneumatic tire, and various proposals have been made. For example, in Patent Document 1 below, discoloration over time is prevented by blending a rubber composition constituting a tire main body such as a tread portion and a side portion with a specific ultraviolet absorber together with a diamine-based anti-aging agent. Is disclosed. Further, Patent Document 2 below discloses a surface protective polish that imparts gloss by being applied to the surface of a product tire.

一方、下記特許文献3には、タイヤの外観とともに耐候性を向上させるために、サイドウォールゴム層の外側に、ナイロンフィルム層を設けた空気入りタイヤが提案されている。また、下記特許文献4には、耐オゾンクラック性を付与しながら、外観を向上するために、超高分子量のポリエチレンからなる薄膜をサイドウォール表面にラミネートした空気入りタイヤが提案されている。
特開2006−143889号公報 特開2002−241705号公報 特開平07−096719号公報 特開平03−292205号公報
On the other hand, Patent Document 3 below proposes a pneumatic tire in which a nylon film layer is provided on the outer side of a sidewall rubber layer in order to improve the weather resistance as well as the appearance of the tire. Further, Patent Document 4 below proposes a pneumatic tire in which a thin film made of ultrahigh molecular weight polyethylene is laminated on a sidewall surface in order to improve the appearance while imparting ozone crack resistance.
JP 2006-143889 A JP 2002-241705 A Japanese Patent Application Laid-Open No. 07-096719 Japanese Patent Laid-Open No. 03-292205

上記特許文献3及び4に開示の技術は、樹脂フィルムをタイヤサイド部の外表面に設けるものではあるが、該フィルムをタイヤ本体に完全に接着することで、該フィルムはタイヤ使用時におけるタイヤ外表面の一部を構成している。すなわち、該フィルムは、タイヤの使用末期までサイド部に貼り付けられたままとされ、それにより、耐候性や耐オゾンクラック性の向上を図っている。そのため、例えば、特許文献3では、ナイロンフィルム層をサイドウォールゴム層に確実に接着するために、ナイロンフィルムにRFL処理などの接着前処理を行っており、樹脂フィルムをタイヤ外表面に剥離可能に設けることを意図したものではない。また、これらの特許文献に開示された単なる熱可塑性樹脂フィルムでは、柔軟性が乏しく、伸びにくいため、タイヤ加硫時におけるタイヤ本体の膨張及びその後の収縮に十分に追従することが難しい。そのため、タイヤ製造段階でシワが入ったり、捲れてしまうという問題がある。   The techniques disclosed in the above Patent Documents 3 and 4 provide a resin film on the outer surface of the tire side portion. However, by completely adhering the film to the tire body, the film is attached to the outside of the tire when the tire is used. It constitutes a part of the surface. That is, the film is left attached to the side portion until the end of use of the tire, thereby improving weather resistance and ozone crack resistance. Therefore, for example, in Patent Document 3, in order to securely bond the nylon film layer to the sidewall rubber layer, the nylon film is subjected to pre-bonding treatment such as RFL treatment so that the resin film can be peeled off the outer surface of the tire. It is not intended to be provided. Moreover, since the mere thermoplastic resin film disclosed in these patent documents has poor flexibility and is difficult to stretch, it is difficult to sufficiently follow the expansion and subsequent contraction of the tire body during tire vulcanization. For this reason, there is a problem that wrinkles or drown at the tire manufacturing stage.

本発明は、以上の点に鑑みてなされたものであり、タイヤ製造時における不具合を解消しつつ、サイド部表面の光の反射を変えることで外観を向上することができる空気入りタイヤを提供することを目的とする。   The present invention has been made in view of the above points, and provides a pneumatic tire that can improve the appearance by changing the reflection of light on the surface of the side portion while solving the problems at the time of manufacturing the tire. For the purpose.

本発明に係る空気入りタイヤは、ゴム成分を配合した熱可塑性樹脂フィルムが、未加硫タイヤ外表面に前記熱可塑性樹脂フィルムを貼付し前記未加硫タイヤを加硫成形することで、タイヤサイド部の外表面に剥離可能に設けられたものである。   In the pneumatic tire according to the present invention, a thermoplastic resin film containing a rubber component is bonded to the outer surface of an unvulcanized tire, and the unvulcanized tire is vulcanized and molded. It is provided in the outer surface of a part so that peeling is possible.

また、本発明に係る空気入りタイヤの製造方法は、ゴム成分を配合した熱可塑性樹脂フィルムを未加硫タイヤのサイド部の外表面に貼付し、前記熱可塑性樹脂フィルムの貼付状態で前記未加硫タイヤを加硫成形することで、前記熱可塑性樹脂フィルムをタイヤサイド部の外表面に剥離可能に設けるものである。   In the method for producing a pneumatic tire according to the present invention, a thermoplastic resin film containing a rubber component is affixed to an outer surface of a side portion of an unvulcanized tire, and the unvulcanized state is applied in the affixed state of the thermoplastic resin film. By vulcanizing and molding a vulcanized tire, the thermoplastic resin film is detachably provided on the outer surface of the tire side portion.

本発明によれば、上記熱可塑性樹脂フィルムは、タイヤとして使用される前にタイヤ本体から剥がすことができる。フィルムを剥がすと、貼っていた部分は、フィルム表面に応じた表面状態に転写されるので、フィルムを貼らなかった場合と比べて、光の反射を変えることができ、タイヤの外観を向上することができる。また、最終のユーザーに商品を渡す段階で上記熱可塑性樹脂フィルムを剥がせば、タイヤ輸送中のキズや汚れの付着も防止することができる。   According to the present invention, the thermoplastic resin film can be peeled off from the tire body before being used as a tire. When the film is peeled off, the pasted part is transferred to the surface state corresponding to the film surface, so that the reflection of light can be changed and the appearance of the tire can be improved compared to the case where the film is not stuck. Can do. Further, if the thermoplastic resin film is peeled off at the stage of delivering the product to the final user, it is possible to prevent scratches and dirt from being attached during tire transportation.

また、熱可塑性樹脂フィルムにゴム成分を配合したことにより、熱可塑性樹脂単独ではなし得なかった柔軟性をゴムが引き出すことができる。そのため、タイヤ製造段階でフィルムにシワが入るのを防止することができ、生産性を損なうことなく、外観を向上することができる。   Moreover, the rubber | gum can draw | extract the softness | flexibility which could not be achieved only with the thermoplastic resin by mix | blending the rubber component with the thermoplastic resin film. Therefore, wrinkles can be prevented from entering the film at the tire manufacturing stage, and the appearance can be improved without impairing productivity.

以下、本発明の実施に関連する事項について詳細に説明する。   Hereinafter, matters related to the implementation of the present invention will be described in detail.

本発明において用いられる熱可塑性樹脂フィルムは、熱可塑性樹脂にゴム成分を配合してなるものである。ゴム成分を配合することにより、熱可塑性樹脂フィルムに柔軟性を付与することができる。また、熱可塑性樹脂フィルムのメリットである平滑さも維持することができる。   The thermoplastic resin film used in the present invention is formed by blending a rubber component with a thermoplastic resin. By blending the rubber component, flexibility can be imparted to the thermoplastic resin film. Moreover, the smoothness which is the merit of a thermoplastic resin film can also be maintained.

該熱可塑性樹脂フィルムは、融点が180℃以上であることが好ましい。180℃未満では、耐熱性の点で加硫に不向きである。熱可塑性樹脂フィルムの融点は200℃以上であることがより好ましい。融点の上限は、特に限定されず、融点は高いほど好ましいが、通常は350℃以下である。ここで、融点は、JIS K7121のDSC(示差走査熱量計)法に準拠して測定される値である。   The thermoplastic resin film preferably has a melting point of 180 ° C. or higher. If it is less than 180 ° C., it is not suitable for vulcanization in terms of heat resistance. The melting point of the thermoplastic resin film is more preferably 200 ° C. or higher. The upper limit of the melting point is not particularly limited, and the higher the melting point, the better, but it is usually 350 ° C. or lower. Here, the melting point is a value measured according to the DSC (Differential Scanning Calorimeter) method of JIS K7121.

該熱可塑性樹脂フィルムは、厚みが10〜200μmであることが好ましい。10μm未満では、未加硫タイヤ外表面への貼付時にシワになりやすく、作業性を損なうとともに、シワにより剥離後のタイヤ表面の光沢度が損なわれる。200μmを超えるような厚手のフィルムであると、加硫成形時におけるタイヤ表面への追従性が悪く、作業性に劣る。該フィルムの厚みは、より好ましくは20〜120μmである。ここで、フィルムの厚みは、JIS K7130のA法に準拠して測定される値である。   The thermoplastic resin film preferably has a thickness of 10 to 200 μm. If it is less than 10 μm, it tends to wrinkle when applied to the outer surface of the unvulcanized tire, impairing workability, and the glossiness of the tire surface after peeling is impaired by wrinkles. When the film is thicker than 200 μm, the followability to the tire surface during vulcanization molding is poor and workability is poor. The thickness of the film is more preferably 20 to 120 μm. Here, the thickness of the film is a value measured in accordance with A method of JIS K7130.

該熱可塑性樹脂フィルムとしては、表面が平滑なものを用いることが好ましい。これにより、熱可塑性樹脂フィルムを剥がしたときに、貼っていた部分の表面粗さが小さく、そのため、光の反射性が向上する。従って、光沢が良くなり、タイヤサイド部に光り輝いた表面を与えることができる。   As the thermoplastic resin film, it is preferable to use a film having a smooth surface. Thereby, when the thermoplastic resin film is peeled off, the surface roughness of the pasted portion is small, so that the light reflectivity is improved. Accordingly, the gloss is improved, and a shiny surface can be given to the tire side portion.

該熱可塑性樹脂フィルムの表面の平滑度は特に限定されないが、算術平均表面粗さ(Ra)が0.1μm以下であることが好ましい。これにより、剥離後のタイヤ表面の光沢度を飛躍的に向上することができ、黒色で光り輝く優れた外観を与えることができる。ここで、算術平均表面粗さ(Ra)は、触針式表面粗さ計を用いて、JIS B0601(触針式表面粗さ測定器)の規定に準拠し測定される単位長さ当たりの表面凹凸程度の算術平均粗さである。   The smoothness of the surface of the thermoplastic resin film is not particularly limited, but the arithmetic average surface roughness (Ra) is preferably 0.1 μm or less. Thereby, the glossiness of the tire surface after peeling can be remarkably improved, and an excellent appearance that is shining in black can be given. Here, the arithmetic average surface roughness (Ra) is a surface per unit length measured using a stylus type surface roughness meter in accordance with JIS B0601 (stylus type surface roughness measuring instrument). Arithmetic average roughness.

該熱可塑性樹脂フィルムを構成する熱可塑性樹脂としては、特に限定されないが、加硫時における耐熱性の点から、例えば、ナイロン6、ナイロン66等のポリアミド系樹脂、ポリエチレンテレフタレート(PET)、ポリブチレンテレフタレート(PBT)、ポリエチレンナフタレート(PEN)等のポリエステル系樹脂フィルムが、好ましいものとして挙げられる。   The thermoplastic resin constituting the thermoplastic resin film is not particularly limited, but from the viewpoint of heat resistance during vulcanization, for example, polyamide resins such as nylon 6 and nylon 66, polyethylene terephthalate (PET), polybutylene Preferred examples include polyester resin films such as terephthalate (PBT) and polyethylene naphthalate (PEN).

熱可塑性樹脂に配合するゴム成分としては、特に限定されず、天然ゴム(NR)、イソプレンゴム(IR)、ブタジエンゴム(BR)、スチレンブタジエンゴム(SBR)、ニトリルゴム(NBR)、クロロプレンゴム(CR)等のジエン系ゴム、エチレンプロピレンゴム(EPDM)、ブチルゴム(IIR)等の非ジエン系ゴムが挙げられる。タイヤ本体からの剥離しやすさを考慮すると、タイヤサイド部を構成するゴム成分とは異なるゴム成分を用いることが好ましい。詳細には、サイド部には一般に天然ゴムやブタジエンゴムが用いられるため、NBR等のサイド部に通常用いられないジエン系ゴムや、非ジエン系ゴムを用いることが好ましい。   The rubber component to be blended with the thermoplastic resin is not particularly limited, and natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), styrene butadiene rubber (SBR), nitrile rubber (NBR), chloroprene rubber ( CR) and other diene rubbers, and non-diene rubbers such as ethylene propylene rubber (EPDM) and butyl rubber (IIR). In consideration of ease of peeling from the tire body, it is preferable to use a rubber component different from the rubber component constituting the tire side portion. Specifically, since natural rubber or butadiene rubber is generally used for the side portion, it is preferable to use a diene rubber or a non-diene rubber that is not normally used for the side portion such as NBR.

ゴム成分の配合量は、特に限定するものではないが、熱可塑性樹脂100重量部に対して10〜50重量部であることが、樹脂フィルムとしての平滑性やタイヤ本体からの剥離しやすさを維持しつつ、樹脂フィルムに柔軟性を付与する上で好ましい。熱可塑性樹脂には、上記ゴム成分とともに硫黄等の加硫剤を配合し、フィルム作製時にゴム成分を加硫してもよい。また、ゴム成分として、予め加硫されたゴムを粉砕してなるゴム粒子を用い、該ゴム粒子を熱可塑性樹脂に混合し、均一に分散させて熱可塑性樹脂フィルムを作製してもよい。   The compounding amount of the rubber component is not particularly limited, but 10 to 50 parts by weight with respect to 100 parts by weight of the thermoplastic resin can provide smoothness as a resin film and ease of peeling from the tire body. It is preferable for imparting flexibility to the resin film while maintaining. The thermoplastic resin may be blended with a vulcanizing agent such as sulfur together with the rubber component, and the rubber component may be vulcanized during film production. Alternatively, rubber particles obtained by pulverizing previously vulcanized rubber may be used as the rubber component, and the rubber particles may be mixed with a thermoplastic resin and uniformly dispersed to produce a thermoplastic resin film.

熱可塑性樹脂フィルムを構成する樹脂組成物には、上記ゴム成分や加硫剤とともに、紫外線吸収剤、可塑剤、亜鉛華、ステアリン酸、加硫促進剤等の各種添加剤を配合することができる。   Various additives such as ultraviolet absorbers, plasticizers, zinc white, stearic acid, vulcanization accelerators and the like can be blended in the resin composition constituting the thermoplastic resin film in addition to the rubber component and the vulcanizing agent. .

上記紫外線吸収剤としては、例えば、2−(2’−ヒドロキシ−5’−メチルフェニル)ベンゾトリアゾール、2−[2−ヒドロキシ−3−(3,4,5,6−テトラヒドロキシフタルイミド−メチル)−5−メチルフェニル]ベンゾトリアゾール、2−(3−t−ブチル−2−ヒドロキシ−5−メチルフェニル)−5−クロロベンゾトリアゾール、2−(2−ヒドロキシ−5−t−オクチルフェニル)ベンゾトリアゾール、2−(2’−ヒドロキシ−3’,5’−ジ−t−ペンチルフェニル)ベンゾトリアゾール等のベンゾトリアゾール系;2,4−ジ−t−ブチルフェニル−1,3,5−トリアジン−2−イル)−5−[(ヘキシル)オキシ]−フェノール等のトリアジン系、2,4−ジ−t−ブチルフェニル−3,5−ジ−t−ブチル−4−ヒドロキシベンゾエート等のベンゾエート系、2−ヒドロキシ−4−n−オクタオキシベンゾフェノン等のベンゾフェノン系、フェニルサリシレート、p−ブチルフェニルサリシレート等のサリチル酸誘導体などが挙げられる。なお、紫外線吸収剤は、上記樹脂組成物に練り込むことで熱可塑性樹脂フィルムに含ませてもよく、あるいはまた、予め製造された熱可塑性樹脂フィルムに対して、紫外線吸収剤を含む液体を浸漬(ディッピング)やコーティングで処理し、フィルム表面に紫外線吸収剤を含む皮膜を形成したものであってもよい。このように熱可塑性樹脂フィルムに紫外線吸収剤を含ませることで、タイヤ製造後、最終のユーザーに渡すまでに長い期間放置された場合でも、タイヤの劣化が抑制され、耐候性を向上することができる。   Examples of the ultraviolet absorber include 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- [2-hydroxy-3- (3,4,5,6-tetrahydroxyphthalimide-methyl). -5-methylphenyl] benzotriazole, 2- (3-t-butyl-2-hydroxy-5-methylphenyl) -5-chlorobenzotriazole, 2- (2-hydroxy-5-t-octylphenyl) benzotriazole Benzotriazoles such as 2- (2′-hydroxy-3 ′, 5′-di-t-pentylphenyl) benzotriazole; 2,4-di-t-butylphenyl-1,3,5-triazine-2 -Yl) -5-[(hexyl) oxy] -phenol and other triazines, 2,4-di-t-butylphenyl-3,5-di-t-butyl 4-hydroxybenzoate etc. benzoate, 2-hydroxy -4-n-octa-oxy benzophenone benzophenone, phenyl salicylate, and salicylic acid derivatives such as p- butylphenyl salicylate and the like. The ultraviolet absorber may be included in the thermoplastic resin film by kneading into the resin composition, or the liquid containing the ultraviolet absorber is immersed in a previously produced thermoplastic resin film. (Dipping) or coating may be used to form a film containing an ultraviolet absorber on the film surface. By including the ultraviolet absorber in the thermoplastic resin film in this way, even if the tire is left for a long period of time after the manufacture of the tire and before it is passed to the final user, the deterioration of the tire can be suppressed and the weather resistance can be improved. it can.

熱可塑性樹脂フィルムを作製する方法は特に限定されず、公知の種々の方法を用いることができる。詳細には、2軸押し出し機やニーダ、バンバリーミキサー等の混合機を用いて、熱可塑性樹脂とゴム成分を混合して上記樹脂組成物を得て、該樹脂組成物から押し出し成型またはカレンダー成型によって熱可塑性樹脂フィルムを作製することができる。上記ゴム成分は、熱可塑性樹脂との混合中に加硫剤を添加することにより、動的加硫させてもよい。   The method for producing the thermoplastic resin film is not particularly limited, and various known methods can be used. Specifically, using a mixer such as a twin-screw extruder, kneader, or Banbury mixer, the thermoplastic resin and the rubber component are mixed to obtain the resin composition, which is then extruded or calendered from the resin composition. A thermoplastic resin film can be produced. The rubber component may be dynamically vulcanized by adding a vulcanizing agent during mixing with the thermoplastic resin.

このようにして得られた熱可塑性樹脂フィルムは、未加硫タイヤ外表面に貼付し、その状態で該未加硫タイヤを加硫成形することで、タイヤサイド部の外表面に剥離可能に設けられる。詳細には、所定の形状に裁断された熱可塑性樹脂フィルムを、加硫前のタイヤ(即ち、グリーンタイヤ)におけるサイド部(即ち、サイドウォール部)外表面の所定位置に貼付し、熱可塑性樹脂フィルムの貼付状態にて、該未加硫タイヤをタイヤ加硫成形型内で加硫成形することにより、上記熱可塑性樹脂フィルムがサイド部の外表面に剥離可能に設けられた空気入りタイヤが製造される。   The thermoplastic resin film thus obtained is attached to the outer surface of the unvulcanized tire, and the unvulcanized tire is vulcanized and molded in this state so as to be peelable on the outer surface of the tire side portion. It is done. Specifically, a thermoplastic resin film cut into a predetermined shape is attached to a predetermined position on the outer surface of a side portion (that is, a sidewall portion) in a tire (that is, a green tire) before vulcanization. A pneumatic tire in which the thermoplastic resin film is peelably provided on the outer surface of the side part is manufactured by vulcanizing and molding the unvulcanized tire in a tire vulcanization mold while the film is attached. Is done.

かかる未加硫タイヤへの熱可塑性樹脂フィルムの貼付は、加硫成形型に未加硫タイヤをセットする前に当該未加硫タイヤに対して実施してもよく、あるいはまた、加硫成形型の所定位置に熱可塑性樹脂フィルムをセットしておき、加硫成形型内で型閉めとともに該熱可塑性樹脂フィルムが未加硫タイヤに貼付されるようにしてもよい。好ましくは、前者のように加硫成形型にセットする前の未加硫タイヤに熱可塑性樹脂フィルムを貼付することである。その際、熱可塑性樹脂フィルムは、粘着性を有する未加硫タイヤの表面と良好な接着性を維持することができ、加硫中の熱可塑性樹脂フィルムの位置ズレを防止することができる。   The affixing of the thermoplastic resin film to the unvulcanized tire may be performed on the unvulcanized tire before setting the unvulcanized tire on the vulcanized mold, or alternatively, the vulcanized mold Alternatively, a thermoplastic resin film may be set at a predetermined position, and the thermoplastic resin film may be affixed to an unvulcanized tire as the mold is closed in a vulcanization mold. Preferably, a thermoplastic resin film is affixed to the unvulcanized tire before setting to a vulcanization mold like the former. In that case, the thermoplastic resin film can maintain the adhesiveness with the surface of the non-vulcanized tire which has adhesiveness, and can prevent the positional deviation of the thermoplastic resin film during vulcanization.

未加硫タイヤの加硫成形自体は、常法に従い行うことができ、加硫成形型の構造についても特に限定されてない。加硫温度についても特に限定されないが、通常は160〜180℃にて実施される。   The vulcanization molding of the unvulcanized tire itself can be performed according to a conventional method, and the structure of the vulcanization mold is not particularly limited. Although it does not specifically limit about vulcanization temperature, Usually, it implements at 160-180 degreeC.

かかる加硫成型時に、タイヤは、熱によって一旦膨張した後、収縮するが、上記のように熱可塑性樹脂フィルムにゴム成分を配合しているので、このようなタイヤ本体の伸縮に熱可塑性樹脂フィルムが追従することができる。そのため、製造段階で熱可塑性樹脂フィルムにシワが入るのを防止して、フィルム剥離後のタイヤ表面の外観不良を解消して生産性を向上することができる。   At the time of such vulcanization molding, the tire is once expanded by heat and then contracted, but since the rubber component is blended with the thermoplastic resin film as described above, the thermoplastic resin film is used for expansion and contraction of such a tire body. Can follow. Therefore, wrinkles can be prevented from entering the thermoplastic resin film in the production stage, and the appearance defect of the tire surface after film peeling can be eliminated and productivity can be improved.

得られた空気入りタイヤにおいては、上記熱可塑性樹脂フィルムがサイド部の外表面に剥離可能に設けられる。すなわち、熱可塑性樹脂フィルムは、加硫成形後にタイヤ本体から剥離できるように接着剤などをタイヤ表面との間で介在させることなく貼付される。そして、貼付された熱可塑性樹脂フィルムの平滑な表面は、タイヤの外表面に実質的に同一の表面粗さで転写されるので、フィルム剥離後のタイヤ表面は、表面粗さが小さく平滑であり、従って、サイド部の光の反射性を向上して、高い光沢度を発揮することができる。   In the obtained pneumatic tire, the said thermoplastic resin film is provided in the outer surface of a side part so that peeling is possible. That is, the thermoplastic resin film is affixed without interposing an adhesive or the like between the tire surface so that it can be peeled off from the tire body after vulcanization molding. And since the smooth surface of the affixed thermoplastic resin film is transferred to the outer surface of the tire with substantially the same surface roughness, the tire surface after film peeling is smooth with a small surface roughness. Therefore, the light reflectivity of the side portion can be improved and high glossiness can be exhibited.

該熱可塑性樹脂フィルムは、剥離してタイヤの使用に供されるが、剥離のタイミングは、最終のユーザーにタイヤを提供する段階が好ましい。このようにタイヤ製造後の保管中や輸送中にも熱可塑性樹脂フィルムを貼付したままにすることで、かかる保管中や輸送中のキズや汚れの付着を防止することができる。なお、熱可塑性樹脂フィルムを剥がさずに使用することもでき、汚れ防止となる。   The thermoplastic resin film is peeled off and used for a tire, and the peeling timing is preferably a stage of providing the tire to the final user. Thus, by keeping the thermoplastic resin film stuck during storage and transportation after tire manufacture, it is possible to prevent adhesion of scratches and dirt during such storage and transportation. In addition, it can also be used without peeling a thermoplastic resin film, and it becomes stain prevention.

図1は、本発明の一実施形態に係る空気入りタイヤT1の半断面図である。このタイヤT1は、トレッド部2と、その両端からタイヤ半径方向内方に延びる左右一対のサイド部3と、該サイド部3の内端に連なりかつリムフランジに固着される左右一対のビード部4とで構成されている。この例では、ビードコア5の周りにカーカスプライ端が折り返し係止されたラジアル構造カーカス6と、このカーカス6のトレッド部2外周に配されたベルト層7を有する乗用車用ラジアルタイヤが示されている。   FIG. 1 is a half sectional view of a pneumatic tire T1 according to an embodiment of the present invention. The tire T1 includes a tread portion 2, a pair of left and right side portions 3 extending inward in the tire radial direction from both ends thereof, and a pair of left and right bead portions 4 connected to the inner ends of the side portions 3 and fixed to rim flanges. It consists of and. In this example, a radial tire for a passenger car having a radial structure carcass 6 in which a carcass ply end is folded and locked around a bead core 5 and a belt layer 7 disposed on an outer periphery of a tread portion 2 of the carcass 6 is shown. .

タイヤT1のサイド部3の外表面には、上記熱可塑性樹脂フィルム10が剥離可能に設けられている。熱可塑性樹脂フィルム10は、この例では、サイド部3の高さ方向の略全体において、タイヤ周方向の全周にわたってリング状に設けられている。   The thermoplastic resin film 10 is detachably provided on the outer surface of the side portion 3 of the tire T1. In this example, the thermoplastic resin film 10 is provided in a ring shape over the entire circumference in the tire circumferential direction over substantially the entire height of the side portion 3.

なお、タイヤT1のサイド部3の外表面には、メーカー名、ブランド名、タイヤサイズなどを示す文字、数字、記号や、タイヤ回転方向などの図形からなる標章(不図示)が一般に設けられる。   In addition, the mark (not shown) which consists of figures, such as a manufacturer name, a brand name, a tire size, a figure which shows a tire name etc., a figure, such as a tire rotation direction, is generally provided in the outer surface of the tire T1. .

このようにサイド部3全体の広い範囲にわたって熱可塑性樹脂フィルム10を設けることで、該フィルム剥離後における光沢度の高いゴム表面部分の面積を大きくして、外観の向上効果に優れる。   Thus, by providing the thermoplastic resin film 10 over a wide range of the entire side portion 3, the area of the rubber surface portion having high gloss after the film is peeled off is increased, and the appearance improving effect is excellent.

熱可塑性樹脂フィルムの貼付箇所は、タイヤサイド部であれば、その範囲ないし大きさ、位置は特に限定されず、例えば、サイド部におけるタイヤ周方向の一部に設けてもよい。また、サイド部の高さ方向の比較的狭い範囲においてタイヤ周方向に全周にわたってリング状に設けてもよい。また、該熱可塑性樹脂フィルムを貼付することで上記標章を鏡面として形成するように、標章の輪郭に沿って裁断した熱可塑性樹脂フィルムを貼付するようにしてもよい。   As long as the thermoplastic resin film is applied to the tire side portion, the range, size, and position of the thermoplastic resin film are not particularly limited. For example, the thermoplastic resin film may be provided in a part of the side portion in the tire circumferential direction. Moreover, you may provide in a ring shape over a perimeter in a tire circumferential direction in the comparatively narrow range of the height direction of a side part. Moreover, you may make it affix the thermoplastic resin film cut | judged along the outline of the mark so that the said mark may be formed as a mirror surface by sticking this thermoplastic resin film.

以下、本発明の実施例を示すが、本発明はこれらの実施例に限定されるものではない。   Examples of the present invention will be described below, but the present invention is not limited to these examples.

(フィルムの作製)
混合機として2軸押し出し機を用いて、熱可塑性樹脂とゴム成分を混合し、カレンダー成型により熱可塑性樹脂フィルムを作製した。熱可塑性樹脂としては、実施例1、2、4及び比較例2では、融点が220℃のナイロン6を用い、実施例3及び比較例3では、融点が260℃のPETを用いた。また、ゴム成分としては、実施例1、3、4では、NBR(JSR(株)製「N241」)を用い、実施例2では、IIR(EXXON社製「2255」)を用い、いずれも、熱可塑性樹脂100重量部に対して30重量部配合した。また、実施例1〜4の各フィルムを構成する樹脂組成物には、ゴム成分以外の共通配合として、熱可塑性樹脂100重量部に対して、硫黄2重量部、加硫促進剤(DM)1重量部、亜鉛華4重量部、ステアリン酸1重量部を配合した。ゴムは熱可塑性樹脂との混合中に、上記加硫剤(硫黄)を添加することで動的加硫した。
(Production of film)
Using a biaxial extruder as a mixer, a thermoplastic resin and a rubber component were mixed, and a thermoplastic resin film was produced by calendar molding. As the thermoplastic resin, in Examples 1, 2, 4 and Comparative Example 2, nylon 6 having a melting point of 220 ° C. was used, and in Example 3 and Comparative Example 3, PET having a melting point of 260 ° C. was used. Further, as the rubber component, in Examples 1, 3, and 4, NBR (“N241” manufactured by JSR Corporation) was used, and in Example 2, IIR (“2255” manufactured by EXXON) was used. 30 parts by weight was blended with 100 parts by weight of the thermoplastic resin. Moreover, in the resin composition which comprises each film of Examples 1-4, 2 parts by weight of sulfur and vulcanization accelerator (DM) 1 are added to 100 parts by weight of the thermoplastic resin as a common compound other than the rubber component. Part by weight, 4 parts by weight of zinc white, and 1 part by weight of stearic acid were blended. The rubber was dynamically vulcanized by adding the above vulcanizing agent (sulfur) during mixing with the thermoplastic resin.

得られた熱可塑性樹脂フィルムの融点、厚み及び表面粗さは、表1に示す通りであり、各測定方法は以下の通りである。   The melting point, thickness, and surface roughness of the obtained thermoplastic resin film are as shown in Table 1, and each measuring method is as follows.

・融点:JIS K7121、DSC法、
・厚み:JIS K7130、A法、
・表面粗さ:JIS B0601の方法に準拠し、(株)東京精密製の触針式表面粗さ計「E−35A」を使用して、熱可塑性樹脂フィルムの表面の算術平均表面粗さ(Ra)を測定。
Melting point: JIS K7121, DSC method,
・ Thickness: JIS K7130, Method A,
Surface roughness: According to the method of JIS B0601, using a stylus type surface roughness meter “E-35A” manufactured by Tokyo Seimitsu Co., Ltd., the arithmetic average surface roughness of the surface of the thermoplastic resin film ( Ra) is measured.

(タイヤの製造)
サイドウォール用ゴム組成物として、天然ゴム(RSS#3)50重量部、ブタジエンゴム(宇部興産(株)製「BR150B」)50重量部、カーボンブラックFEF(東海カーボン(株)製「シーストSO」)60重量部、アロマオイル(ジャパンエナジー(株)製「X−140」)10重量部、パラフィンワックス(日本精蝋(株)製「OZOACE−0355」)2重量部、老化防止剤6C(大内新興化学工業(株)製「ノクラック6C」)2重量部、ステアリン酸(花王(株)製「ルナックS−20」)2重量部、酸化亜鉛(三井金属鉱業(株)製「亜鉛華1号」)3重量部、硫黄(細井化学工業(株)製「5%油処理粉末硫黄」)2重量部、加硫促進剤NS(大内新興化学工業(株)製「ノクセラーNS−P」)1.5重量部からなる配合処方にて、容量200Lのバンバリーミキサーを使用して常法により混練し、ゴム組成物を調製した。
(Tire manufacturing)
As rubber composition for the sidewall, natural rubber (RSS # 3) 50 parts by weight, butadiene rubber (UBE Industries, Ltd. “BR150B”) 50 parts by weight, carbon black FEF (Tokai Carbon Co., Ltd. “Seast SO”) ) 60 parts by weight, 10 parts by weight of aroma oil (“X-140” manufactured by Japan Energy Co., Ltd.), 2 parts by weight of paraffin wax (“OZOACE-0355” manufactured by Nippon Seiwa Co., Ltd.), anti-aging agent 6C (large) 2 parts by weight of Uchinoseki Chemical Co., Ltd. “NOCRACK 6C”), 2 parts by weight of stearic acid (“LUNAC S-20” manufactured by Kao Corporation), zinc oxide (“Zinc Hua 1” manufactured by Mitsui Kinzoku Mining Co., Ltd.) No. ") 3 parts by weight, sulfur (" 5% oil-treated powdered sulfur "manufactured by Hosoi Chemical Co., Ltd.) 2 parts by weight, vulcanization accelerator NS (" Noxeller NS-P "manufactured by Ouchi Shinsei Chemical Co., Ltd.) ) 1.5 parts by weight At consisting formulation, by conventional methods and kneaded using a Banbury mixer having a volume 200L, to prepare a rubber composition.

得られたゴム組成物をサイド部に適用した空気入りラジアルタイヤ(サイズ:215/60R16)を試作した。その際、実施例1〜4及び比較例2,3では、熱可塑性樹脂フィルムを所定の大きさに裁断し、該フィルムを図1に示すように未加硫タイヤのサイド部外表面に貼り付け、貼り付けた状態でスチール製のタイヤ成型用金型にセットして、170℃×20分の加硫条件で、各試作タイヤを加硫成形した。   A pneumatic radial tire (size: 215 / 60R16) in which the obtained rubber composition was applied to the side portion was prototyped. At that time, in Examples 1 to 4 and Comparative Examples 2 and 3, the thermoplastic resin film was cut into a predetermined size, and the film was attached to the outer surface of the side portion of the unvulcanized tire as shown in FIG. Then, the tires were set in a steel mold for tire molding, and each prototype tire was vulcanized under a vulcanization condition of 170 ° C. × 20 minutes.

各試作タイヤについて、熱可塑性樹脂フィルムのシワの有無を評価するとともに、該フィルムの剥離後におけるゴム表面の光沢度を測定した。各評価ないし測定方法は以下の通りである。   For each prototype tire, the thermoplastic resin film was evaluated for the presence or absence of wrinkles, and the glossiness of the rubber surface after peeling of the film was measured. Each evaluation or measurement method is as follows.

[フィルムのシワ]
タイヤ加硫成形後に熱可塑性樹脂フィルムにシワがあるかどうかを調べ、シワがないものを「○」、シワがあったものを「×」で評価した。
[Film wrinkles]
After the tire vulcanization molding, the thermoplastic resin film was examined for wrinkles, and “◯” indicates that there was no wrinkle, and “X” indicates that there was a wrinkle.

[光沢]
日本電色工業(株)製の光沢計「VG2000」を使用し、JIS Z8741の方法に準拠し、試作タイヤの樹脂フィルム貼付部における剥離後のゴム表面の60°光沢度を測定した。測定は、タイヤ周方向で5箇所で実施し、その平均値を求めた。光沢度は値が大きいほど良い。

Figure 2009255881
[Glossy]
A gloss meter “VG2000” manufactured by Nippon Denshoku Industries Co., Ltd. was used, and the 60 ° glossiness of the rubber surface after peeling at the resin film pasting portion of the prototype tire was measured according to the method of JIS Z8741. The measurement was performed at five locations in the tire circumferential direction, and the average value was obtained. The higher the glossiness, the better.
Figure 2009255881

結果は表1に示すとおりであり、実施例1〜4であると、熱可塑性樹脂フィルムを貼付しなかったコントロールタイヤである比較例1に対し、表面粗さの非常に小さなゴム表面を形成することができ、そのため、高い光沢度が得られて、黒色に光り輝く優れた外観のサイド部を形成することができた。また、熱可塑性樹脂フィルムの柔軟性に優れ、加硫成型時におけるタイヤ本体の膨張・収縮に熱可塑性樹脂フィルムが追従することができ、加硫成形後に熱可塑性樹脂フィルムにシワが発生しておらず、生産性に優れていた。   A result is as showing in Table 1, and forms rubber surface with very small surface roughness with respect to the comparative example 1 which is a control tire which did not stick a thermoplastic resin film as it is Examples 1-4. Therefore, high glossiness was obtained, and a side portion having an excellent appearance that shined black and could be formed. In addition, the thermoplastic resin film is excellent in flexibility, and the thermoplastic resin film can follow the expansion and contraction of the tire body during vulcanization molding, and wrinkles are generated in the thermoplastic resin film after vulcanization molding. It was excellent in productivity.

これに対し、ゴムを配合していない単なる熱可塑性樹脂からなるフィルムを用いた比較例2,3では、加硫成形後のフィルムにシワが発生しており、生産性に劣るものであった。   On the other hand, in Comparative Examples 2 and 3 using a film made of a simple thermoplastic resin not containing rubber, wrinkles were generated in the film after vulcanization molding, and the productivity was poor.

本発明の一実施形態に係る空気入りタイヤの半断面図である。1 is a half sectional view of a pneumatic tire according to an embodiment of the present invention.

符号の説明Explanation of symbols

T1…空気入りタイヤ
3…サイド部
10…熱可塑性樹脂フィルム
T1 ... Pneumatic tire 3 ... Side part 10 ... Thermoplastic resin film

Claims (3)

ゴム成分を配合した熱可塑性樹脂フィルムが、未加硫タイヤ外表面に前記熱可塑性樹脂フィルムを貼付し前記未加硫タイヤを加硫成形することで、タイヤサイド部の外表面に剥離可能に設けられた、空気入りタイヤ。   A thermoplastic resin film blended with a rubber component is provided on the outer surface of the tire side part by attaching the thermoplastic resin film to the outer surface of the unvulcanized tire and vulcanizing the unvulcanized tire. Pneumatic tires. 前記熱可塑性樹脂フィルムは、融点が180℃以上で、厚みが10〜200μmである、請求項1記載の空気入りタイヤ。   The pneumatic tire according to claim 1, wherein the thermoplastic resin film has a melting point of 180 ° C. or higher and a thickness of 10 to 200 μm. ゴム成分を配合した熱可塑性樹脂フィルムを未加硫タイヤのサイド部の外表面に貼付し、前記熱可塑性樹脂フィルムの貼付状態で前記未加硫タイヤを加硫成形することで、前記熱可塑性樹脂フィルムをタイヤサイド部の外表面に剥離可能に設ける、空気入りタイヤの製造方法。   A thermoplastic resin film blended with a rubber component is affixed to the outer surface of the side portion of the unvulcanized tire, and the unvulcanized tire is vulcanized and molded with the thermoplastic resin film being affixed. A method for producing a pneumatic tire, wherein a film is provided on an outer surface of a tire side part so as to be peelable.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104125888A (en) * 2012-02-21 2014-10-29 横滨橡胶株式会社 Pneumatic tire and production method for pneumatic tire

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52101504A (en) * 1976-05-10 1977-08-25 Bridgestone Corp Pneumatic tire with flat and delight colored band on side wall thereof
JPS5690704A (en) * 1979-12-24 1981-07-23 Sumitomo Rubber Ind Ltd Film for protecting white letter of tire
JPH1086605A (en) * 1996-07-22 1998-04-07 Yokohama Rubber Co Ltd:The Pneumatic tire

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52101504A (en) * 1976-05-10 1977-08-25 Bridgestone Corp Pneumatic tire with flat and delight colored band on side wall thereof
JPS5690704A (en) * 1979-12-24 1981-07-23 Sumitomo Rubber Ind Ltd Film for protecting white letter of tire
JPH1086605A (en) * 1996-07-22 1998-04-07 Yokohama Rubber Co Ltd:The Pneumatic tire

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104125888A (en) * 2012-02-21 2014-10-29 横滨橡胶株式会社 Pneumatic tire and production method for pneumatic tire
US11458778B2 (en) 2012-02-21 2022-10-04 The Yokohama Rubber Co., Ltd. Pneumatic tire and method of manufacturing pneumatic tire

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