JP2003252012A - Pneumatic tire - Google Patents
Pneumatic tireInfo
- Publication number
- JP2003252012A JP2003252012A JP2002057786A JP2002057786A JP2003252012A JP 2003252012 A JP2003252012 A JP 2003252012A JP 2002057786 A JP2002057786 A JP 2002057786A JP 2002057786 A JP2002057786 A JP 2002057786A JP 2003252012 A JP2003252012 A JP 2003252012A
- Authority
- JP
- Japan
- Prior art keywords
- tire
- roughness
- rough surface
- rough
- abrasive grains
- 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.)
- Granted
Links
Landscapes
- Tires In General (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、外観を向上しうる
空気入りタイヤに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tire having an improved appearance.
【０００２】[0002]
【従来の技術】空気入りタイヤは、通常、カーボンブラ
ックなどの補強材が配合された黒色のゴムによって形成
される。ところが、時間の経過とともにゴムに添加され
たワックス等の油分や老化防止剤などの添加剤がタイヤ
の外表面に移行して滲み出し、反射光等によっては外表
面がぎらついて見えることがあり外観を損ねやすい。特
にこのような傾向は、外部から視認されやすいサイドウ
ォール部において顕著となる。2. Description of the Related Art Pneumatic tires are usually made of black rubber containing a reinforcing material such as carbon black. However, with the passage of time, oil components such as wax added to rubber and additives such as anti-aging agents migrate to the outer surface of the tire and seep out, and the outer surface may appear glare due to reflected light etc. Easy to damage. In particular, such a tendency becomes remarkable in the sidewall portion that is easily visible from the outside.
【０００３】従来、このような問題を解決するために、
ワックスや老化防止剤などの配合量などを減じ前記滲み
だし自体を少なくする試みがなされてはいる。しかしな
がら、ワックスや老化防止剤の配合量が低下すると、タ
イヤの耐久性や耐候性などが低下するといった不具合を
伴う。Conventionally, in order to solve such a problem,
Attempts have been made to reduce the bleeding itself by reducing the amount of wax, anti-aging agent and the like. However, if the blending amount of the wax or the antioxidant is reduced, the tire durability and weather resistance are deteriorated.
【０００４】発明者らは、このような実状に鑑み鋭意研
究を重ねたところ、タイヤの外表面に一定の範囲に限定
された表面粗さを付与することによって、タイヤに当た
る光を乱反射し、タイヤの外表面をしっとりと黒っぽく
見せ、前記添加剤の滲みだし等が生じてもこれを目立ち
難くして外観の悪化を抑制しうることを見出した。以上
のように、本発明は、タイヤの外表面の表面粗さを規制
することを基本として、外観を向上しうる空気入りタイ
ヤを提供することを目的としている。The inventors of the present invention have conducted extensive studies in view of such circumstances, and as a result, by imparting a surface roughness limited to a certain range to the outer surface of the tire, the light impinging on the tire is diffusely reflected and the tire It has been found that the outer surface of the product looks moist and black, and even if the additive oozes out, it can be made inconspicuous and the deterioration of the appearance can be suppressed. As described above, it is an object of the present invention to provide a pneumatic tire whose appearance can be improved on the basis of regulating the surface roughness of the outer surface of the tire.
【０００５】[0005]
【課題を解決するための手段】本発明のうち請求項１記
載の発明は、外表面の少なくとも一部に、十点平均粗さ
Ｒｚが５〜１００μｍでありかつ局部山頂の平均間隔Ｓ
が２０〜１５０μｍの表面粗さを有する粗面部を具える
ことを特徴とする空気入りタイヤである。According to a first aspect of the present invention, at least a part of the outer surface has a ten-point average roughness Rz of 5 to 100 μm and an average spacing S of local peaks.
Has a rough surface portion having a surface roughness of 20 to 150 μm.
【０００６】ここで、「十点平均粗さＲｚ」は、ＪＩＳ
−Ｂ−０６０１の規定に準拠して測定される。すなわ
ち、タイヤの外表面を針触式の表面粗さ測定器で測定
し、粗さ曲線からその平均線の方向に基準長さだけ抜き
取り、この抜き取り部分の最も高い山頂から５番目まで
の山頂の標高の絶対値の平均値と、最も低い谷底から５
番目までの谷底の標高の絶対値の平均値との和を求め、
この値をマイクロメートルで表したものを十点平均粗さ
Ｒｚとする。なお本例では基準長さＬを０．８mm、評価
長さを４mmの条件とする。Here, "ten-point average roughness Rz" is defined by JIS
-Measured according to the regulations of B-0601. That is, the outer surface of the tire is measured with a stylus-type surface roughness measuring instrument, and a reference length is extracted from the roughness curve in the direction of the average line, and the 5th to 5th peaks of the extracted peak are measured. 5 from the average of absolute absolute values and the lowest valley bottom
Find the sum of the absolute value of the altitude of the valley bottom up to the
The value expressed in micrometers is the ten-point average roughness Rz. In this example, the standard length L is 0.8 mm and the evaluation length is 4 mm.
【０００７】また「局部山頂の平均間隔」は、ＪＩＳに
は規定がないがＩＳＯ等で定められており、図２に示す
ように、タイヤの外表面の粗さ曲線Ｎからその平均線ｍ
の方向に基準長さＬだけ抜き取り、この抜き取り部分に
おいて隣り合う局部山頂間に対する平均線の長さ（局部
山頂の間隔）Ｓ１、…Ｓｉ、…Ｓｎを求め、この多数の
局部山頂の間隔の算術平均値で表される。なお本例では
基準長さＬを０．８mm、評価長さを４mmの条件とする。The "average spacing of local peaks" is not specified in JIS, but is defined by ISO, etc., and as shown in FIG.
The reference length L is extracted in the direction of, and the average line length (interval of local peaks) S1, ... Si, ... Sn between adjacent local peaks in this extracted portion is calculated, and the arithmetic operation of the intervals of the multiple local peaks is performed. It is expressed as an average value. In this example, the standard length L is 0.8 mm and the evaluation length is 4 mm.
【０００８】また前記粗面部は、サイドウォール部の外
表面の少なくとも一部をなすことが望ましく、また粗面
部が形成されたゴム部は、老化防止剤又はワックスの配
合量を０．５〜５ＰＨＲとし耐久性、耐候性などを向上
させることが望ましい。The rough surface portion preferably forms at least a part of the outer surface of the sidewall portion, and the rubber portion on which the rough surface portion is formed has an antioxidant or wax content of 0.5 to 5 PHR. It is desirable to improve durability and weather resistance.
【０００９】[0009]
【発明の実施の形態】以下本発明の実施の一形態を図面
に基づき説明する。図１は本発明の一実施形態にかかる
空気入りタイヤの部分斜視図を示している。空気入りタ
イヤ１は、トレッド部２と、この両端からタイヤ半径方
向外側にのびるサイドウォール部３と、このサイドウォ
ール部３の外端に連なりかつリムに着座するビード部４
とを具えるトロイド状で構成され、本例ではラジアル構
造カーカス６と、このカーカス６をタガ締めするベルト
層７とを有する乗用車用ラジアルタイヤが例示される。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a partial perspective view of a pneumatic tire according to an embodiment of the present invention. The pneumatic tire 1 includes a tread portion 2, a sidewall portion 3 extending from both ends of the pneumatic tire 1 to the outer side in the tire radial direction, and a bead portion 4 that is continuous with the outer end of the sidewall portion 3 and is seated on a rim.
A radial tire for a passenger vehicle, which is configured in a toroidal shape and has a radial structure carcass 6 and a belt layer 7 that tightens the carcass 6 by a tie, is exemplified in this example.
【００１０】本発明の空気入りタイヤ１は、その外表面
の少なくとも一部に、十点平均粗さＲｚが５〜１００μ
ｍでありかつ局部山頂の平均間隔Ｓが２０〜１５０μｍ
の表面粗さを有する粗面部５を含むことを特徴事項の一
つとしている。本実施形態の粗面部５は、外部から視認
されやすいサイドウォール部３の外表面３ａに形成した
ものを示している。またサイドウォール部３の外表面３
ａに標章等の模様９が形成される場合があるが、本例で
はこの模様９についても粗面部５で形成している。The pneumatic tire 1 of the present invention has a ten-point average roughness Rz of 5 to 100 μm on at least a part of its outer surface.
m and the average spacing S of local peaks is 20 to 150 μm
One of the features is that it includes the rough surface portion 5 having the surface roughness of. The rough surface portion 5 of the present embodiment is formed on the outer surface 3a of the sidewall portion 3 that is easily visible from the outside. In addition, the outer surface 3 of the sidewall portion 3
A pattern 9 such as a mark may be formed on a, but in this example, the pattern 9 is also formed by the rough surface portion 5.
【００１１】発明者らの種々の実験の結果、このような
粗面部５は外部からの光を好ましい加減で乱反射できタ
イヤ１をしっとりとした色調で黒々と見せることが判明
した。そして、曝露実験等を繰り返しタイヤ外表面に添
加剤を滲み出させても、この粗面部５では滲みだしが殆
ど目立たず、長期に亘ってタイヤの外観を向上維持しう
ることを見出した。As a result of various experiments conducted by the inventors, it has been found that such a rough surface portion 5 can diffusely reflect light from the outside with preferable adjustment and make the tire 1 appear moist and black. Then, it was found that even if the additive is exuded to the outer surface of the tire by repeating the exposure experiment and the like, the exudation is hardly noticeable in the rough surface portion 5, and the appearance of the tire can be improved and maintained for a long period of time.
【００１２】前記粗面部５において、十点平均粗さＲｚ
が５μｍ未満であると、光が良い加減に乱反射せず、逆
にタイヤが白っぽく見えてしまう傾向が強く、しかもタ
イヤ外表面に滲みだした油分などのぎらつきなどが目立
ちやすくなる。なお従来のタイヤでは、この十点平均粗
さＲｚが２μｍ程度のものが多く、このように滲みだし
が目立っていたと考えられる。逆に粗面部５の十点平均
粗さＲｚが１００μｍよりも大きくなると、タイヤの外
表面がヤスリのようにザラザラとした質感となり、商品
価値を損ね易いため好ましくない。より好ましくは、粗
面部５の十点平均粗さＲｚを８〜８０μｍ、さらに好ま
しくは１０〜５０μｍ、特に好ましくは１５〜３５μｍ
とするのが望ましい。In the rough surface portion 5, the ten-point average roughness Rz
Is less than 5 μm, the light is not properly diffused and diffusely reflected, and on the contrary, the tire tends to look whitish, and moreover, glare such as oil oozing on the outer surface of the tire becomes conspicuous. Incidentally, in many conventional tires, the ten-point average roughness Rz is about 2 μm, and it is considered that the exudation was conspicuous in this way. On the contrary, when the ten-point average roughness Rz of the rough surface portion 5 is larger than 100 μm, the outer surface of the tire has a rough texture like a file, and the commercial value is likely to be deteriorated, which is not preferable. More preferably, the ten-point average roughness Rz of the rough surface portion 5 is 8 to 80 μm, further preferably 10 to 50 μm, and particularly preferably 15 to 35 μm.
Is desirable.
【００１３】また発明者らは、このような好ましい範囲
の十点平均粗さＲｚに従い複数本のタイヤを試作したと
ころ、意外にも上述の十点平均粗さＲｚの範囲を満たす
タイヤでありながら外観の向上がさほど向上されていな
いタイヤが含まれていることに気付いた。そして、これ
らの全てのタイヤから荒さ曲線を採取して鋭意検討した
ところ、その主たる原因は、表面粗さの偏りにあるある
ことを突き止めた。表面粗さの偏りとは、図３に示す如
く、基準長さＬの粗さ曲線Ｎの中に、上述の十点平均粗
さＲｚを満たしうる振幅の山や谷が含まれてはいるもの
の、これらの大部分が基準長さＬの一方側に偏って存在
する現象を指す。このような粗さ曲線ｍの外表面を持つ
タイヤでは、部分的に反射ムラ等が生じてしまい、粗面
部５において、しっとりとした黒さを醸し出すことが困
難となることが判明した。Further, the inventors of the present invention have made a plurality of tires by trial according to such a preferable range of 10-point average roughness Rz. Surprisingly, the tire satisfies the above-mentioned range of 10-point average roughness Rz. I noticed that it included tires that didn't improve much in appearance. Then, when a roughness curve was collected from all of these tires and earnestly studied, it was found that the main cause thereof was the unevenness of the surface roughness. The deviation of the surface roughness means that, as shown in FIG. 3, the roughness curve N of the reference length L includes peaks and troughs having an amplitude that can satisfy the above-mentioned ten-point average roughness Rz. , A phenomenon in which most of them are biased toward one side of the reference length L. It has been found that in a tire having an outer surface having such a roughness curve m, uneven reflection or the like partially occurs, which makes it difficult to produce a moist black color in the rough surface portion 5.
【００１４】そこで、本発明者らは、このような表面粗
さの偏りのないタイヤについて種々実験を繰り返したと
ころ、前記十点平均粗さのパラメータに加え、局部山頂
の平均間隔Ｓを２０〜１５０μｍに限定することが非常
に有効であることを見出した。すなわち、前記粗面部５
において、局部山頂の平均間隔Ｓが２０μｍよりも小で
あると、表面粗さの偏りが生じ易く、その結果、タイヤ
を効果的に黒々と見せることできないことが分かった。
逆に、粗面部５の局部山頂の平均間隔Ｓが１５０μｍよ
りも大きくなると、表面粗さの偏りは防止できるが、適
度な粗さを維持するために、十分平均粗さＲを大きくす
る必要があり表面がザラザラし商品価値を損ねるという
傾向があり好ましくない。このような観点より、特に好
ましくは局部山頂の平均間隔Ｓを２５〜１２０μｍ、よ
り好ましくは３０〜１００μｍ、さらに好ましくは４０
〜７０μｍとするのが望ましい。Then, the inventors of the present invention repeated various experiments on such a tire having no unevenness in surface roughness. As a result, in addition to the parameter of the ten-point average roughness, the average interval S of local peaks was 20 to 20. It has been found that limiting to 150 μm is very effective. That is, the rough surface portion 5
It was found that when the average spacing S of local peaks is smaller than 20 μm, the unevenness of the surface roughness is likely to occur, and as a result, the tire cannot be effectively seen as black.
On the contrary, when the average spacing S of the local peaks of the rough surface portion 5 becomes larger than 150 μm, the unevenness of the surface roughness can be prevented, but it is necessary to increase the average roughness R sufficiently in order to maintain the appropriate roughness. There is a tendency that the surface becomes rough and the commercial value is impaired, which is not preferable. From such a viewpoint, it is particularly preferable that the average spacing S between local peaks is 25 to 120 μm, more preferably 30 to 100 μm, and further preferably 40.
It is desirable that the thickness is ˜70 μm.
【００１５】なお前記十点平均粗さＲｚ、局部山頂の平
均間隔Ｓは、いずれも粗さ曲線から抜き取る基準長さＬ
を０．８mm、評価長さを４mmとすることが前提となる。
標準長さＬが０．８mmよりも小さいと、十分平均粗さＲ
ｚを大きく見積もってしまい、平滑で色っぽい表面にな
る傾向があり、逆に０．８mmよりも大きいと、十点平均
粗さＲｚを小さく見積もってしまい、荒れた表面になり
易いなど商品価値を損ねるという傾向がある。The ten-point average roughness Rz and the average interval S of local peaks are both reference lengths L extracted from the roughness curve.
Is 0.8 mm and the evaluation length is 4 mm.
If the standard length L is smaller than 0.8 mm, the average roughness R is sufficient.
If z is larger than 0.8 mm, the ten-point average roughness Rz will be underestimated, which tends to result in a rough surface, thus degrading the product value. Tends to.
【００１６】本実施形態では、前記粗面部５が、サイド
ウォール部３の外表面３ａをなすものを示しているが、
特にこの位置には限定されるわけではない。従って、サ
イドウォール部３の外表面３ａ以外にも、トレッド部２
やビード部４などの各外表面を粗面部５とすることもで
きる。また、特に好適にはタイヤ１の外表面全体をこの
ような粗面部５で形成することが望ましい。In this embodiment, the rough surface portion 5 forms the outer surface 3a of the sidewall portion 3, but
It is not particularly limited to this position. Therefore, in addition to the outer surface 3 a of the sidewall portion 3, the tread portion 2
The outer surface of each of the bead portion 4 and the bead portion 4 may be the rough surface portion 5. Further, it is particularly preferable to form the entire outer surface of the tire 1 with such a rough surface portion 5.
【００１７】前記粗面部５が形成されるゴム部（本例で
はサイドウォールゴム）には、老化防止剤及び／又はワ
ックスを０．５〜５ＰＨＲ含ませることが可能である。
老化防止剤、ワックスなどの添加剤をこのような配合量
で含むことにより、該ゴム部の耐久性、耐候性などを向
上させることができる。またワックス又は老化防止剤が
タイヤの外表面に滲みだしても、粗面部５によって光を
効果的に乱反射させ、該添加剤の滲みだしを目立たなく
する。従って、タイヤの耐久性を高めつつ外観の悪化が
抑制される。The rubber portion (sidewall rubber in this example) on which the rough surface portion 5 is formed can contain 0.5 to 5 PHR of an antioxidant and / or wax.
By including an additive such as an antioxidant and a wax in such a blending amount, the durability and weather resistance of the rubber portion can be improved. Further, even if the wax or the anti-aging agent bleeds to the outer surface of the tire, the rough surface portion 5 effectively diffuses light to make the bleeding of the additive inconspicuous. Therefore, deterioration of the appearance is suppressed while enhancing the durability of the tire.
【００１８】また、このような粗面部５は、図４に示す
如く、該粗面部５と実質的に等しい表面粗さを具えた粗
面部成形面１２を有するタイヤ加硫金型１０によって形
成することができる。即ち、金型１０の表面粗さが加硫
成形によりタイヤ１の外表面に実質的に同一の表面粗さ
で転写される。Further, such a rough surface portion 5 is formed by a tire vulcanizing mold 10 having a rough surface portion molding surface 12 having a surface roughness substantially equal to that of the rough surface portion 5, as shown in FIG. be able to. That is, the surface roughness of the mold 10 is transferred to the outer surface of the tire 1 by vulcanization with substantially the same surface roughness.
【００１９】本実施形態のタイヤ加硫金型１０は、タイ
ヤを加硫成形する成形面１１を有する。該成形面１１
は、例えばトレッド部２の外表面を成形するトレッド成
形面１１ａ、サイドウォール部３の外表面３ａを成形す
るサイドウォール成形面１１ｂ、及びビード部４の外表
面を成形するビード成形面１１ｃを含み、例えばアルミ
ニウムで形成されている。本例では、前記サイドウォー
ル成形面１１ｂに、前記粗面部成形面１２を設けた態様
を例示する。そして、該粗面部成形面１２は、前記粗面
部５と同一の表面粗さ、即ち十点平均粗さＲｚが５〜１
００μｍでありかつ局部山頂の平均間隔Ｓが２０〜１５
０μｍの表面粗さを有する。The tire vulcanizing mold 10 of this embodiment has a molding surface 11 for vulcanizing and molding a tire. The molding surface 11
Includes, for example, a tread molding surface 11a for molding the outer surface of the tread portion 2, a sidewall molding surface 11b for molding the outer surface 3a of the sidewall portion 3, and a bead molding surface 11c for molding the outer surface of the bead portion 4. , For example, formed of aluminum. In this example, the side wall molding surface 11b is provided with the rough surface molding surface 12. The rough surface forming surface 12 has the same surface roughness as the rough surface 5, that is, the ten-point average roughness Rz is 5 to 1.
The average spacing S of local peaks is 20 to 15
It has a surface roughness of 0 μm.
【００２０】このような粗面成形部１２は、例えば前記
成形面１１に特定形状の砥粒を噴射しかつ衝突させる砥
粒噴射工程により形成しうる。砥粒噴射工程において、
砥粒は高圧空気、高圧液体又は遠心力などあらゆる手段
を用いて加速させて噴射させることができ、その方法は
問わない。また砥粒の材料は特に限定されないが、例え
ば鉄、鋳鋼、セラミックス等が好適である。Such a rough surface forming portion 12 can be formed, for example, by an abrasive grain injection step of injecting and colliding abrasive grains of a specific shape onto the forming surface 11. In the abrasive grain injection process,
The abrasive grains can be accelerated and jetted by using any means such as high-pressure air, high-pressure liquid or centrifugal force, and the method is not limited. The material of the abrasive grains is not particularly limited, but iron, cast steel, ceramics, etc. are preferable.
【００２１】図５（Ａ）には、このようなタイヤ加硫金
型を製造するのに適した砥粒Ｔの一例を拡大して示す。
該砥粒Ｔは、鉄を原料とし、例えば平均粒子径が１０μ
ｍ以上かつ１mm以下、より好ましくは２０μｍ〜０．７
mm、さらに好ましくは３０μｍ〜０．５mmで、しかも表
面に比較的鋭の稜線を多数有する砕石状かつ非球形状の
ものが好ましい。FIG. 5 (A) shows an enlarged example of the abrasive grains T suitable for manufacturing such a tire vulcanizing mold.
The abrasive grains T are made of iron as a raw material and have an average particle size of 10 μm, for example.
m or more and 1 mm or less, more preferably 20 μm to 0.7
mm, more preferably 30 μm to 0.5 mm, and preferably a crushed stone-like and non-spherical one having a large number of relatively sharp ridges on the surface.
【００２２】前記砥粒Ｔの平均粒子径が１０μｍ未満で
あると、高圧空気を用いて加速、噴射させる際に周囲に
飛散して作業環境が悪化しやすく、しかも粗面部成形面
１２が上述のような表面粗さになり難い。逆に砥粒Ｔの
平均粒子径が１mmを超える場合、砥粒Ｔの表面が持つ鋭
の稜線を転写しづらくなり、しかも金型表面を早期に摩
耗させるという傾向があるため好ましくない。If the average particle size of the abrasive grains T is less than 10 μm, the work environment is likely to be deteriorated by scattering to the surroundings when accelerating and jetting using high-pressure air, and the rough surface molding surface 12 has the above-mentioned structure. It is difficult to have such a surface roughness. On the other hand, if the average particle diameter of the abrasive grains T exceeds 1 mm, it becomes difficult to transfer the sharp ridge line of the surface of the abrasive grains T, and the mold surface tends to be worn early, which is not preferable.
【００２３】また砥粒Ｔに、図５（Ｂ）に示すビースシ
ョットのような略球状のものを用いると、粒子径を種々
違えても上述の粗面部成形面５の表面粗さを得ることが
難しい。このように、本実施形態では、表面に鋭の稜線
が多数形成された無秩序な形態を有する砕石状の砥粒Ｔ
を用いるのが望ましい。Further, when the abrasive grains T have a substantially spherical shape such as the bead shot shown in FIG. 5 (B), the above-mentioned surface roughness of the rough surface forming surface 5 can be obtained even if the particle diameters are different. Is difficult. As described above, in this embodiment, crushed stone-shaped abrasive grains T having a disordered shape in which a large number of sharp ridges are formed on the surface.
It is preferable to use.
【００２４】より好適には、砥粒Ｔの比重は０．５〜２
０、さらに好ましくは０．８〜１８、特に好ましくは
１．２〜１５であるのが望ましい。砥粒Ｔの比重が５未
満であると、タイヤ加硫金型１０の成形面１１に微細な
凹凸を付与するためには衝突速度を大幅に高めたり或い
は砥粒Ｔを長時間噴射し続ける必要があるため作業性に
難があり、逆に２０を超えると、砥粒Ｔを加速するのに
多くのエネルギーが必要となるため生産コストを増大さ
せる他、金型の摩耗を早める。More preferably, the specific gravity of the abrasive grains T is 0.5 to 2
It is preferably 0, more preferably 0.8 to 18, and particularly preferably 1.2 to 15. If the specific gravity of the abrasive grains T is less than 5, it is necessary to significantly increase the collision speed or continuously inject the abrasive grains T for a long time in order to impart fine irregularities to the molding surface 11 of the tire vulcanization mold 10. Therefore, workability is difficult, and conversely, if it exceeds 20, a large amount of energy is required to accelerate the abrasive grains T, which increases the production cost and accelerates wear of the mold.
【００２５】また、より好適には、砥粒のモース硬度は
２〜１０、さらに好ましくは２．５〜８、特に好ましく
は３〜７であるのが望ましい。砥粒のモース硬度が２未
満であると、金型表面を荒らす能力が低くなるという不
具合があり、逆に８を超えると、早期に金型を痛め易い
という傾向がある。Further, more preferably, the Mohs hardness of the abrasive grains is 2 to 10, more preferably 2.5 to 8, and particularly preferably 3 to 7. If the Mohs hardness of the abrasive grains is less than 2, there is a problem that the ability to roughen the surface of the mold becomes low, and if it exceeds 8, on the contrary, the mold tends to be damaged early.
【００２６】本実施形態では、このような砥粒Ｔを１０
０〜１０００ｋＰａの高圧空気によって前記成形面に３
０秒以上かつ１０分以下の時間で前記噴射して粗面成形
部１２を形成している。砥粒Ｔを噴射するための高圧空
気が１００ｋＰａ未満又は噴射、衝突時間が３０秒未満
であると、成形面１１に満遍なく粗面部成形面１２を形
成するのが困難な傾向があり、逆に高圧空気が１０００
ｋＰａを超える場合又は砥粒の噴射衝突時間が１０分を
超える場合には、砥粒Ｔが衝突によって成形面に突き刺
さったり、あるいは成形面を損傷させるおそれがある。
なお砥粒Ｔの比重、前記高圧空気の圧力などを調節し、
砥粒の噴射速度（砥粒が噴射装置から噴射されるときの
速度）が０．３〜１０（ｍ／ｓ）、より好適には０．５
〜７（ｍ／ｓ）であることが望ましい。In this embodiment, the abrasive grain T of 10
3 to the molding surface by high pressure air of 0 to 1000 kPa
The rough surface forming portion 12 is formed by performing the injection for a time of 0 seconds or more and 10 minutes or less. If the high-pressure air for spraying the abrasive grains T is less than 100 kPa or the spraying time is less than 30 seconds, it tends to be difficult to form the rough surface molding surface 12 evenly on the molding surface 11, and conversely 1000 air
If it exceeds kPa or if the abrasive grain injection collision time exceeds 10 minutes, the abrasive grains T may pierce the molding surface or damage the molding surface due to collision.
In addition, by adjusting the specific gravity of the abrasive grains T, the pressure of the high pressure air, etc.,
The spraying speed of the abrasive grains (speed at which the abrasive grains are sprayed from the spraying device) is 0.3 to 10 (m / s), and more preferably 0.5.
It is desirable that it is ~ 7 (m / s).
【００２７】図６（Ａ）には、このような砥粒を噴射し
た粗面形成部１２の表面拡大写真を示し、同図（Ｂ）に
は、ビースショット（平均粒子径２００μｍ）を衝突さ
せた成形面を示す。図６（Ａ）の粗面形成部１２では、
表面が非常に細かくかつランダムな凹凸がきめ細かく形
成されているのに対して、図６（Ｂ）のものは、表面が
非常に滑らかでかつ鱗状のような周期的模様となってお
り、形状の相違が明瞭に生じていることが確認できる。FIG. 6 (A) shows an enlarged photograph of the surface of the rough surface forming portion 12 sprayed with such abrasive grains, and FIG. 6 (B) shows a bead shot (average particle diameter 200 μm) colliding. Shows the molded surface. In the rough surface forming unit 12 of FIG.
The surface is very fine and the random irregularities are finely formed, whereas the one in FIG. 6B has a very smooth surface and a periodic pattern like scales. It can be confirmed that the difference clearly occurs.
【００２８】[0028]
【実施例】粗面部を有するサイズ２３５／４５ＺＲ１７
の乗用車用ラジアルタイヤ（実施例）を表１の仕様に基
づき試作しタイヤの外観を評価した。また比較のため
に、粗面部を有しない同サイズのタイヤ（比較例）につ
いても併せて試作した。実施例については、サイドウォ
ール部の外表面に粗面部を設けた。またタイヤの外観
は、新品状態及び曝露（夏期の晴天時１０日間の曝露）
を行った後の状態の双方で行い、５点法により評価し
た。数値が大きいほど良好である。テストの結果などを
表１に示すが、実施例のものは、比較例に比べて外観を
大幅に向上していることが確認できる。[Example] Size 235/45 ZR17 having a rough surface portion
A radial tire for a passenger car (Example) was manufactured based on the specifications shown in Table 1, and the appearance of the tire was evaluated. For comparison, a tire of the same size having no rough surface portion (comparative example) was also prototyped. In the example, the rough surface portion was provided on the outer surface of the sidewall portion. In addition, the appearance of the tire is in a new condition and exposed (exposure for 10 days during fine weather in summer)
The evaluation was performed by the 5-point method in both of the states after performing. The larger the value, the better. The test results are shown in Table 1, and it can be confirmed that the appearance of the example is significantly improved as compared with the comparative example.
【００２９】[0029]
【表１】 [Table 1]
【００３０】[0030]
【発明の効果】上述したように、本発明の空気入りタイ
ヤは、粗面部によって外部からの光を好ましい加減で乱
反射できタイヤを黒々と見せることができる。これによ
り、添加剤の滲みだし等が目立ちにくくなり、長期に亘
りタイヤの外観を向上しうる。とりわけ、請求項２記載
の発明のように、外部から視認されやすいサイドウォー
ル部にこの粗面部を形成することにより、より効果的に
タイヤの外観が向上できる。As described above, in the pneumatic tire of the present invention, the rough surface portion can diffusely reflect the light from the outside with a preferable adjustment and can make the tire appear black. As a result, the exudation of the additive is less noticeable, and the appearance of the tire can be improved for a long period of time. In particular, as in the second aspect of the invention, by forming the rough surface portion on the sidewall portion that is easily visible from the outside, the appearance of the tire can be improved more effectively.
【００３１】また、請求項３ないし４記載の発明のよう
に、前記粗面部が形成されたゴム部が、ワックス又は老
化防止剤を０．５〜５ＰＨＲ含むときには、通常のタイ
ヤと同様に耐久性などを高めることができる。またワッ
クス又は老化防止剤がタイヤ外表面に滲み出しても外観
を損ねることがない。When the rubber portion on which the rough surface portion is formed contains wax or an antioxidant in an amount of 0.5 to 5 PHR, the durability is the same as that of a normal tire. And so on. Further, even if the wax or the anti-aging agent oozes out on the outer surface of the tire, the appearance is not damaged.
【図１】本発明の実施形態を示す部分斜視図である。FIG. 1 is a partial perspective view showing an embodiment of the present invention.
【図２】局部山頂の平均間隔Ｓを説明するための粗さ曲
線を示す線図である。FIG. 2 is a diagram showing a roughness curve for explaining an average interval S of local peaks.
【図３】表面粗さの偏りを説明するための粗さ曲線を示
す線図である。FIG. 3 is a diagram showing a roughness curve for explaining the deviation of the surface roughness.
【図４】タイヤ加硫金型の部分斜視図である。FIG. 4 is a partial perspective view of a tire vulcanizing mold.
【図５】（Ａ）は本実施形態で用いた砥粒の拡大図、
（Ｂ）は従来のビースショットの拡大図である。FIG. 5A is an enlarged view of the abrasive grains used in the present embodiment,
(B) is an enlarged view of a conventional bead shot.
【図６】（Ａ）はタイヤ加硫金型の粗面成形部の拡大
図、（Ｂ）は球状の砥粒を衝突させた金型の表面拡大図
である。FIG. 6A is an enlarged view of a rough surface forming portion of a tire vulcanizing mold, and FIG. 6B is an enlarged view of a surface of a mold on which spherical abrasive grains are collided.
２ トレッド部 ３ サイドウォール部 ３ａ サイドウォール部の外面 ４ ビード部 ５ 粗面部 １０ タイヤ加硫金型 １１ 成形面 １２ 粗面部成形面 2 tread section 3 Side wall part 3a Outside of sidewall 4 bead part 5 rough surface 10 Tire vulcanization mold 11 Molding surface 12 Rough surface molding surface
Claims (4)
Ｒｚが５〜１００μｍでありかつ局部山頂の平均間隔Ｓ
が２０〜１５０μｍの表面粗さを有する粗面部を具える
ことを特徴とする空気入りタイヤ。1. A ten-point average roughness Rz of 5 to 100 μm and an average interval S of local peaks on at least a part of the outer surface.
Is a rough tire having a surface roughness of 20 to 150 μm.
の少なくとも一部をなすことを特徴とする請求項１記載
の空気入りタイヤ。2. The pneumatic tire according to claim 1, wherein the rough surface portion forms at least a part of an outer surface of the sidewall portion.
止剤を０．５〜５ＰＨＲ含むことを特徴とする請求項１
又は２記載の空気入りタイヤ。3. The rubber portion on which the rough surface portion is formed contains an antioxidant in an amount of 0.5 to 5 PHR.
Alternatively, the pneumatic tire according to item 2.
スを０．５〜５ＰＨＲ含むことを特徴とする請求項１乃
至３のいずれかに記載の空気入りタイヤ。4. The pneumatic tire according to claim 1, wherein the rubber portion having the roughened surface portion contains wax in an amount of 0.5 to 5 PHR.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002057786A JP4138336B2 (en) | 2002-03-04 | 2002-03-04 | Pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002057786A JP4138336B2 (en) | 2002-03-04 | 2002-03-04 | Pneumatic tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003252012A true JP2003252012A (en) | 2003-09-09 |
| JP4138336B2 JP4138336B2 (en) | 2008-08-27 |
Family
ID=28667966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002057786A Expired - Fee Related JP4138336B2 (en) | 2002-03-04 | 2002-03-04 | Pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4138336B2 (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007230162A (en) * | 2006-03-03 | 2007-09-13 | Toyo Tire & Rubber Co Ltd | Mold for vulcanizing/molding tire and pneumatic tire manufactured using the same |
| DE102008010486A1 (en) | 2007-02-22 | 2008-09-18 | Toyo Tire & Rubber Co., Ltd. | Pneumatic tire for e.g. passenger car, has markings e.g. letters, that are represented at walls, where surface sections of markings have glazing surface with middle line-averaged surface roughness in range of specific micrometers |
| JP2011218950A (en) * | 2010-04-08 | 2011-11-04 | Toyo Tire & Rubber Co Ltd | Pneumatic tire, tire mold, and method of manufacturing pneumatic tire |
| JP2012131254A (en) * | 2010-12-20 | 2012-07-12 | Sumitomo Rubber Ind Ltd | Run-flat tire |
| US20130068363A1 (en) * | 2010-03-26 | 2013-03-21 | Bridgestone Corporation | Pneumatic tire and method of manufacturing tire vulcanization mold |
| WO2013122232A1 (en) * | 2012-02-17 | 2013-08-22 | 株式会社ブリヂストン | Tire, and tire manufacturing method |
| WO2019060517A1 (en) | 2017-09-22 | 2019-03-28 | Bridgestone Americas Tire Operations, Llc | Pneumatic tire with a textured surface, method of manufacturing, and textured mold |
| CN109982871A (en) * | 2016-11-18 | 2019-07-05 | 米其林集团总公司 | With the tire comprising at least outer sidewall of diene elastomer and wax mixture |
| JP2019119398A (en) * | 2018-01-10 | 2019-07-22 | 住友ゴム工業株式会社 | tire |
| CN110774494A (en) * | 2019-10-25 | 2020-02-11 | 安徽佳通乘用子午线轮胎有限公司 | Tire mold and processing method thereof, tire vulcanization method and tire |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007230162A (en) * | 2006-03-03 | 2007-09-13 | Toyo Tire & Rubber Co Ltd | Mold for vulcanizing/molding tire and pneumatic tire manufactured using the same |
| DE102008010486A1 (en) | 2007-02-22 | 2008-09-18 | Toyo Tire & Rubber Co., Ltd. | Pneumatic tire for e.g. passenger car, has markings e.g. letters, that are represented at walls, where surface sections of markings have glazing surface with middle line-averaged surface roughness in range of specific micrometers |
| US20130068363A1 (en) * | 2010-03-26 | 2013-03-21 | Bridgestone Corporation | Pneumatic tire and method of manufacturing tire vulcanization mold |
| US9393719B2 (en) * | 2010-03-26 | 2016-07-19 | Bridgestone Corporation | Pneumatic tire with specified outer surface |
| JP2011218950A (en) * | 2010-04-08 | 2011-11-04 | Toyo Tire & Rubber Co Ltd | Pneumatic tire, tire mold, and method of manufacturing pneumatic tire |
| JP2012131254A (en) * | 2010-12-20 | 2012-07-12 | Sumitomo Rubber Ind Ltd | Run-flat tire |
| WO2013122232A1 (en) * | 2012-02-17 | 2013-08-22 | 株式会社ブリヂストン | Tire, and tire manufacturing method |
| US9919567B2 (en) | 2012-02-17 | 2018-03-20 | Bridgestone Corporation | Tire and tire manufacturing method |
| CN109982871B (en) * | 2016-11-18 | 2022-02-18 | 米其林集团总公司 | Tire having an outer sidewall comprising at least a diene elastomer and a wax mixture |
| CN109982871A (en) * | 2016-11-18 | 2019-07-05 | 米其林集团总公司 | With the tire comprising at least outer sidewall of diene elastomer and wax mixture |
| EP3684606A4 (en) * | 2017-09-22 | 2021-05-19 | Bridgestone Americas Tire Operations, LLC | Pneumatic tire with a textured surface, method of manufacturing, and textured mold |
| US20200247077A1 (en) * | 2017-09-22 | 2020-08-06 | Bridgestone Americas Tire Operations, Llc | Pneumatic tire with a textured surface, method of manufacturing, and textured mold |
| WO2019060517A1 (en) | 2017-09-22 | 2019-03-28 | Bridgestone Americas Tire Operations, Llc | Pneumatic tire with a textured surface, method of manufacturing, and textured mold |
| EP4212363A1 (en) * | 2017-09-22 | 2023-07-19 | Bridgestone Americas Tire Operations, LLC | Pneumatic tire with a textured surface |
| JP2019119398A (en) * | 2018-01-10 | 2019-07-22 | 住友ゴム工業株式会社 | tire |
| JP7081158B2 (en) | 2018-01-10 | 2022-06-07 | 住友ゴム工業株式会社 | tire |
| CN112074423A (en) * | 2018-06-18 | 2020-12-11 | 横滨橡胶株式会社 | Pneumatic tire |
| JPWO2019244578A1 (en) * | 2018-06-18 | 2021-05-06 | 横浜ゴム株式会社 | Pneumatic tires |
| US20210268843A1 (en) * | 2018-06-18 | 2021-09-02 | The Yokohama Rubber Co., Ltd. | Pneumatic Tire |
| JP7143850B2 (en) | 2018-06-18 | 2022-09-29 | 横浜ゴム株式会社 | pneumatic tire |
| CN112074423B (en) * | 2018-06-18 | 2023-02-17 | 横滨橡胶株式会社 | Pneumatic tire |
| CN110774494A (en) * | 2019-10-25 | 2020-02-11 | 安徽佳通乘用子午线轮胎有限公司 | Tire mold and processing method thereof, tire vulcanization method and tire |
| CN110774494B (en) * | 2019-10-25 | 2021-12-31 | 安徽佳通乘用子午线轮胎有限公司 | Tire mold and processing method thereof, tire vulcanization method and tire |
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