JP2000008282A - Steel cord for reinforcing rubber article - Google Patents
Steel cord for reinforcing rubber articleInfo
- Publication number
- JP2000008282A JP2000008282A JP10168860A JP16886098A JP2000008282A JP 2000008282 A JP2000008282 A JP 2000008282A JP 10168860 A JP10168860 A JP 10168860A JP 16886098 A JP16886098 A JP 16886098A JP 2000008282 A JP2000008282 A JP 2000008282A
- Authority
- JP
- Japan
- Prior art keywords
- core
- sheath
- diameter
- wire
- steel cord
- 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
Classifications
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
- D07B1/0606—Reinforcing cords for rubber or plastic articles
- D07B1/062—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2001—Wires or filaments
- D07B2201/2006—Wires or filaments characterised by a value or range of the dimension given
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2016—Strands characterised by their cross-sectional shape
- D07B2201/2018—Strands characterised by their cross-sectional shape oval
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2023—Strands with core
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2024—Strands twisted
- D07B2201/2025—Strands twisted characterised by a value or range of the pitch parameter given
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2047—Cores
- D07B2201/2052—Cores characterised by their structure
- D07B2201/2059—Cores characterised by their structure comprising wires
- D07B2201/206—Cores characterised by their structure comprising wires arranged parallel to the axis
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2207/00—Rope or cable making machines
- D07B2207/20—Type of machine
- D07B2207/209—Tubular strander
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2401/00—Aspects related to the problem to be solved or advantage
- D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
- D07B2401/208—Enabling filler penetration
Landscapes
- Ropes Or Cables (AREA)
- Tires In General (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ゴム物品補強用の
スチールコードに関し、特に、トラック、バス用のラジ
アルタイヤ（ＴＢＲ）のベルト層の補強材として好適な
スチールコードに関する。The present invention relates to a steel cord for reinforcing rubber articles, and more particularly to a steel cord suitable as a reinforcing material for a belt layer of a radial tire (TBR) for trucks and buses.
【０００２】[0002]
【従来の技術】従来、ＴＢＲのベルト層補強用のスチー
ルコードとしては、複数の素線を撚合わせてなるコア
と、このコアの回りに素線を２層に撚合わせた２層のシ
ースとからなる３層構造のスチールコードが用いられて
いた。しかし、最近では軽量化および構造の簡略化が指
向され、コアと１層のシースとからなる２層構造のスチ
ールコードが広く用いられてきている。2. Description of the Related Art Conventionally, as a steel cord for reinforcing a belt layer of a TBR, a core formed by twisting a plurality of wires, and a two-layer sheath formed by twisting the wires into two layers around the core are known. Was used. However, recently, a steel cord having a two-layer structure including a core and a single-layer sheath has been widely used in order to reduce the weight and simplify the structure.
【０００３】この２層構造のスチールコードの中でも、
複数のコア素線を撚合わせずに並列に配置したコアを有
するスチールコードは、次のような利点があることが知
られている。 （１）１工程の撚合わせで製造できるため、経済性に優
れている。 （２）コア素線の並列方向がタイヤのベルト層の幅方向
に沿うようにスチールコードを配列することにより、乗
り心地等を損なうことなく、操縦安定性に優れたタイヤ
が得られる。また、ベルト層の厚さを薄くできるため
に、タイヤを軽量化することができる。[0003] Among these two-layer steel cords,
It is known that a steel cord having a core in which a plurality of core wires are arranged in parallel without being twisted has the following advantages. (1) It is economical because it can be manufactured by one-step twisting. (2) By arranging the steel cords so that the parallel direction of the core strands is along the width direction of the belt layer of the tire, a tire having excellent steering stability can be obtained without impairing riding comfort. Further, since the thickness of the belt layer can be reduced, the weight of the tire can be reduced.
【０００４】複数（Ｍ本）のコア素線を撚合わせずに並
列に配置したコアと、このコアの回りに複数（Ｎ本）の
シース素線を撚合わせてなる１層のシースとからなる２
層構造（以下「Ｍ並列＋Ｎ構造」と言う）のゴム物品補
強用スチールコードに関しては、例えば、次のような技
術が開示されている。A plurality of (M) core strands are arranged in parallel without being twisted, and a single-layer sheath formed by twisting a plurality (N) of sheath strands around the core. 2
Regarding a steel cord for reinforcing a rubber article having a layer structure (hereinafter, referred to as “M parallel + N structure”), for example, the following technology is disclosed.
【０００５】特開平９−１５８０６５号公報には、複数
本のコア素線を無撚でかつその複数本が横並びの列状に
配列されてなるコアと、複数のシース素線をコア素線に
外接してコアの回りで撚ってなるシースとからなり、横
断面形状が楕円形であるＭ並列＋Ｎ構造のスチールコー
ドが開示されている。Japanese Patent Application Laid-Open No. 9-1580065 discloses a core in which a plurality of core strands are non-twisted and a plurality of the core strands are arranged in a side-by-side row, and a plurality of sheath strands are used as a core strand. A steel cord having an M-parallel + N structure, which is made of a sheath circumscribed and twisted around a core and having an elliptical cross-sectional shape, is disclosed.
【０００６】また、特開平９−１５６３１４号公報に
は、同径の２本のコア素線を撚ることなく並列したコア
と、コア素線の０．８〜１．２倍の直径を有する同径の
５〜８本のシース素線を、素線間に隙間を設けながらコ
アに密接してシース素線径の４０〜６０倍のピッチで螺
旋状に巻付けたシースとからなる、断面輪郭が大略楕円
形の２並列＋Ｎ構造（Ｎ＝５〜８）のスチールコードが
開示されている。Japanese Unexamined Patent Publication No. 9-156314 discloses a core in which two core wires having the same diameter are arranged in parallel without twisting, and has a diameter 0.8 to 1.2 times the core wire. A cross section comprising 5 to 8 sheath wires having the same diameter, which are spirally wound at a pitch of 40 to 60 times the sheath wire diameter in close contact with the core while providing a gap between the wires. A steel cord having a two-parallel + N structure (N = 5 to 8) having a substantially elliptical contour is disclosed.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、従来の
Ｍ並列＋Ｎ構造のスチールコードには、次のような問題
点がある。 （１）コア素線とシース素線との荷重負担差が大きいた
め、強度発揮効率や耐久性に劣る。 （２）コア素線同士が交差した部分が存在し易い。 （３）コアとシースとの間に内部トーションが残留する
ため、このスチールコードを複数本並列して埋設したゴ
ムシートを才断した際に、シート端部の反り返りを生じ
易い。このため、タイヤ製造時の取扱性に劣る。However, the conventional M-parallel + N steel cord has the following problems. (1) Since the load difference between the core element wire and the sheath element wire is large, the strength display efficiency and durability are poor. (2) A portion where core strands intersect easily exists. (3) Since internal torsion remains between the core and the sheath, when the rubber sheet in which a plurality of the steel cords are buried in parallel is breached, the sheet ends are likely to be warped. For this reason, handleability during tire production is poor.
【０００８】そこで本発明の目的は、上記問題点を解消
し、Ｍ並列＋Ｎ構造のスチールコードにおいて、コア素
線同士が交差した部分が存在し難く、残留内部トーショ
ンが小さく、しかも強度発揮効率や耐久性にも優れたゴ
ム物品補強用スチールコードを提供することにある。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems, and in a steel cord having an M-parallel + N structure, a portion where core wires intersect hardly exists, the residual internal torsion is small, and the strength exhibiting efficiency and An object of the present invention is to provide a steel cord for reinforcing rubber articles having excellent durability.
【０００９】[0009]
【課題を解決するための手段】本発明者は、前記課題を
解消すべく鋭意検討した結果、２並列＋８構造のゴム物
品補強用スチールコードにおいて、素線径と撚ピッチ比
率を適正化することにより前記目的を達成し得ることを
見出し、本発明を完成するに至った。Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, have found that in a steel cord for reinforcing rubber articles having a two-parallel +8 structure, the wire diameter and the twist pitch ratio are optimized. As a result, the present inventors have found that the above object can be achieved, and have completed the present invention.
【００１０】即ち、同じ直径ｄｃを有する２本の真直な
コア素線を撚合わせずに長手方向に並列して配置してな
るコアと、同じ直径ｄｓを有する８本のシース素線を前
記コアの回りに撚合わせてなる１層のシースとによって
構成された、扁平な横断面輪郭を有するゴム物品補強用
スチールコードにおいて、前記コア素線の直径ｄｃが
０．３０ｍｍ以上かつ０．３８ｍｍ以下、前記シース素
線の直径ｄｓがｄｃ−０．０１ｍｍ以下かつｄｃ−０．
０５ｍｍ以上であり、前記シース素線の撚ピッチＰがコ
ア素線の直径ｄｃの５０倍以上かつシース素線直径ｄｓ
の１２０倍以下であることを特徴とするものである。That is, a core in which two straight core wires having the same diameter dc are arranged in parallel in the longitudinal direction without twisting, and eight sheath wires having the same diameter ds are connected to the core. In a steel cord for reinforcing a rubber article having a flat cross-sectional profile constituted by a single-layer sheath twisted around, a diameter dc of the core element wire is 0.30 mm or more and 0.38 mm or less, The diameter ds of the sheath wire is dc-0.01 mm or less and dc-0.
05 mm or more, the twist pitch P of the sheath wire is 50 times or more the diameter dc of the core wire, and the sheath wire diameter ds
120 times or less.
【００１１】本発明のゴム物品補強用スチールコードに
おいて特に好ましいのは、コア素線の直径ｄｃが０．３
２ｍｍ以上かつ０．３６ｍｍ以下、シース素線の直径ｄ
ｓがｄｃ−０．０１ｍｍ以下かつｄｃ−０．０３ｍｍ以
上であり、撚ピッチＰがコア素線径ｄｃの６０倍以上か
つシース素線径ｄｓの９０倍以下であるスチールコード
である。[0011] In the steel cord for reinforcing rubber articles of the present invention, particularly preferably, the diameter dc of the core strand is 0.3.
2 mm or more and 0.36 mm or less, diameter d of sheath wire
The steel cord in which s is dc-0.01 mm or less and dc-0.03 mm or more, and the twist pitch P is 60 times or more the core element diameter dc and 90 times or less the sheath element diameter ds.
【００１２】[0012]
【発明の実施の形態】本発明のゴム物品補強用スチール
コードについて、図１を参照して説明する。図１は、本
発明の一例のゴム物品補強用スチールコードの横断面を
示す図である。図示するスチールコード１は、コア２
と、１層のシース３とから構成されている。コア２は、
２本のコア素線２ａおよび２ｂを撚合わせずに並列に配
置したものである。コア素線２ａと２ｂは、実質的に同
じ直径ｄｃを有し、ｄｃは０．３０ｍｍ以上かつ０．３
８ｍｍ以下である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A steel cord for reinforcing a rubber article according to the present invention will be described with reference to FIG. FIG. 1 is a diagram showing a cross section of a steel cord for reinforcing a rubber article according to an example of the present invention. The steel cord 1 shown is a core 2
And a single-layer sheath 3. Core 2 is
Two core strands 2a and 2b are arranged in parallel without twisting. The core strands 2a and 2b have substantially the same diameter dc, where dc is at least 0.30 mm and 0.3
8 mm or less.
【００１３】シース３は、コア２の周囲に撚合わされた
８本のシース素線４からなる。８本のシース素線４はす
べて実質的に同じ直径ｄｓを有し、ｄｓはコア素線径ｄ
ｃよりも小さく、両者の差は０．０１ｍｍ以上かつ０．
０５ｍｍ以下である。また、シース素線４の撚ピッチＰ
は、コア素線径ｄｃの５０倍以上かつシース素線径ｄｓ
の１２０倍以下の範囲内にある。図１に示すように、８
本のシース素線４をコア素線２ａおよび２ｂに概略接し
て巻付けることにより、スチールコード１の横断面の輪
郭形状は略楕円形となる。コア素線２ａおよび２ｂ並び
にシース素線４としては、好ましくは引張り強さが２８
００ＭＰａ以上、さらに好ましくは３０００ＭＰａ以上
である黄銅めっき鋼線を用いる。The sheath 3 is composed of eight sheath wires 4 twisted around the core 2. All eight sheath wires 4 have substantially the same diameter ds, where ds is the core wire diameter d.
c, the difference between the two is 0.01 mm or more and 0.1 mm.
05 mm or less. The twist pitch P of the sheath wire 4
Is at least 50 times the core wire diameter dc and the sheath wire diameter ds
Is within a range of 120 times or less. As shown in FIG.
By winding the sheath wire 4 approximately in contact with the core wires 2a and 2b, the profile of the cross section of the steel cord 1 becomes substantially elliptical. The core strands 2a and 2b and the sheath strand 4 preferably have a tensile strength of 28.
A brass-plated steel wire having a pressure of 00 MPa or more, more preferably 3000 MPa or more, is used.
【００１４】本発明のゴム物品補強用スチールコードの
基本構造として、シース素線がコア素線よりも０．０１
ｍｍ以上小径な２並列＋８構造を採用したのは、次の理
由による。まず、コア素線の本数を２本としたのは、コ
ア素線が３本以上であると、コード横断面においてコア
素線が１列に並ばない部分が生じ易く、タイヤのベルト
層補強に使用した際にベルト層の厚さを薄くできるとい
う効果が損なわれるためである。また、シース素線をコ
ア素線よりも０．０１ｍｍ以上小径とし、かつシース素
線の本数を８本としたのは、十分にゴムが侵入できる大
きさのシース素線間隙間を、極端な偏りなく形成するこ
とが容易だからである。As a basic structure of the steel cord for reinforcing rubber articles of the present invention, the sheath wire is 0.01% less than the core wire.
The reason why the 2-parallel +8 structure having a small diameter of not less than mm is adopted is as follows. First, the reason why the number of core strands is set to two is that if the number of core strands is three or more, a portion in which the core strands are not arranged in a line in a cord cross section is likely to be generated. This is because the effect of reducing the thickness of the belt layer when used is impaired. In addition, the reason why the sheath wire has a diameter smaller than the core wire by 0.01 mm or more and the number of the sheath wires is eight is that the gap between the sheath wires, which is large enough for rubber to enter, is extremely small. This is because it is easy to form without bias.
【００１５】次に、本発明のスチールコードの特徴であ
る、コア素線径ｄｃ、シース素線径ｄｓおよび撚ピッチ
Ｐに関する限定の理由について説明する。Next, the reasons for the limitations on the core wire diameter dc, sheath wire diameter ds and twist pitch P, which are the characteristics of the steel cord of the present invention, will be described.
【００１６】コア素線の直径ｄｃの下限を０．３０ｍｍ
とするのは、上記の基本構造の下で、ＴＢＲのベルト層
補強用コードとして十分な強度および剛性を確保するた
めである。一方、上限を０．３８ｍｍとするのは、ｄｃ
が０．３８ｍｍを超えると、スプールに巻付けた際にコ
ードに巻き癖が付いて真直性が損なわれるためである。
特に好ましいｄｃの範囲は、０．３２ｍｍ以上かつ０．
３６ｍｍ以下である。The lower limit of the diameter dc of the core strand is 0.30 mm.
This is to ensure sufficient strength and rigidity as a TBR belt layer reinforcing cord under the above basic structure. On the other hand, the upper limit is set to 0.38 mm because dc
If it exceeds 0.38 mm, the cord will have a curl when wound on a spool, and the straightness will be impaired.
A particularly preferred range of dc is 0.32 mm or more and 0.1.
36 mm or less.
【００１７】また、シース素線径ｄｓをコア素線径ｄｃ
よりも０．０１ｍｍ以上小径とするが、両者の差を０．
０５ｍｍ以下とし、かつ撚ピッチＰをコア素線径ｄｃの
５０倍以上とするのは、このような限定を付加すること
により、コア素線同士が交差した部分が生じ難くなり、
コード内部の残留トーションも抑制できることを見出し
たためである。これについて以下に詳しく説明する。The sheath wire diameter ds is changed to the core wire diameter dc.
Smaller than 0.01 mm, but the difference between the two is 0.1 mm.
The reason for making the twist pitch P 50 mm or less and the core pitch 50 times or more of the core strand diameter dc is as follows.
This is because they have found that residual torsion in the code can be suppressed. This will be described in detail below.
【００１８】図２は、２並列＋８構造のスチールコード
の製造方法の例を示す図である。コア素線２ａおよび２
ｂは、チューブラー型撚線機１０の外部から供給され、
回転するバレル１１内を通過し、撚合わせダイ１２にお
いて、バレル１１内から供給された８本のシース素線４
が撚合わされ、２並列＋８構造が形成される。この過程
において、コア素線２ａと２ｂの中心を結ぶ方向（以下
「コア並列方向」と言う）は、理論的には一定のはずで
あるが、実際にはバレル１１内の通過抵抗等により捩れ
を生じる。撚合わせダイ１２におけるシース素線４の撚
合わせは、この捩れに対しての修正作用を有するが、捩
れが甚だしいと、むしろコア素線同士が交差した部分を
生じたり、コード内部に大きなトーションを生じたりす
る。FIG. 2 is a diagram showing an example of a method of manufacturing a steel cord having a two-parallel +8 structure. Core strands 2a and 2
b is supplied from the outside of the tubular type twisting wire machine 10,
After passing through the rotating barrel 11, the twisted dies 12 feed the eight sheath wires 4 supplied from inside the barrel 11.
Are twisted to form a two-parallel +8 structure. In this process, the direction connecting the centers of the core strands 2a and 2b (hereinafter referred to as "core parallel direction") should be theoretically constant, but in actuality, it is twisted due to the passage resistance in the barrel 11, and the like. Is generated. Twisting of the sheath wire 4 in the twisting die 12 has a correcting action for this twist. However, if the twist is excessive, a portion where the core wires cross each other or a large torsion is generated inside the cord. May occur.
【００１９】バレル１１通過時におけるコア並列方向の
捩れを減少するためのひとつの方法は、バレル１１の回
転速度に対してコア素線２ａおよび２ｂの通過速度を大
きくすること、すなわち撚ピッチＰを大きくすることで
ある。具体的には、通常の撚線機を使用した場合、撚ピ
ッチＰをコア素線の直径ｄｃの５０倍以上、好ましくは
６０倍以上とすることにより、コア並列方向の捩れが十
分に減少し、シース素線４の撚合わせによる修正の際の
コア素線同士の交差や大きな内部トーションの発生を抑
制することができる。ただし、撚ピッチＰが大きすぎる
と撚合わせ後のシースの保形性が悪くなるため、撚ピッ
チＰはシース素線径ｄｓの１２０倍以下、好ましくは９
０倍以下とする。One method for reducing the twist in the core parallel direction when passing through the barrel 11 is to increase the passing speed of the core strands 2a and 2b with respect to the rotation speed of the barrel 11, that is, to reduce the twist pitch P. It is to make it big. Specifically, when a normal twisting machine is used, the twist in the core parallel direction is sufficiently reduced by setting the twist pitch P to 50 times or more, preferably 60 times or more the diameter dc of the core strand. In addition, it is possible to suppress the crossing of the core wires and the occurrence of large internal torsion when the sheath wires 4 are corrected by twisting. However, if the twist pitch P is too large, the shape retention of the sheath after twisting deteriorates, so that the twist pitch P is 120 times or less the sheath wire diameter ds, preferably 9 times.
0 or less.
【００２０】一方、シース素線径ｄｓがｄｃ−０．０５
ｍｍ未満であるとシース素線の剛性が小さいため、コア
並列方向の捻れを十分に修正するためには、コアの捻れ
に対抗してシースが大きな潜在トーションを持つように
撚合わせる必要がある。このようにして撚合わされたス
チールコードは切断端部におけるシース回転量が大き
く、このスチールコードを複数本並列して埋設したゴム
シートを才断した際に、シート端部が大きく反り返り易
い。そこで、シース素線径ｄｓをｄｃ−０．０５ｍｍ以
上、好ましくはｄｃ−０．０３ｍｍ以上とする。On the other hand, the sheath wire diameter ds is dc−0.05.
When the diameter is less than mm, the rigidity of the sheath wire is small. Therefore, in order to sufficiently correct the twist in the core parallel direction, it is necessary to twist the sheath so as to have a large latent torsion against the twist of the core. The thus twisted steel cord has a large amount of sheath rotation at the cut end, and when the rubber sheet in which a plurality of the steel cords are laid in parallel is breached, the sheet end is easily warped greatly. Therefore, the sheath wire diameter ds is set to dc−0.05 mm or more, preferably dc−0.03 mm or more.
【００２１】さらに、シース素線径ｄｓとコア素線径ｄ
ｃとの差は０．０５ｍｍ以下と小さいため、矯正装置１
３においてローラーによる繰り返し曲げ等を加えた際の
コア素線とシース素線の曲げ歪差が小さく、真直性、捩
れ等を効果的に矯正することができる。Further, the sheath wire diameter ds and the core wire diameter d
Since the difference from c is as small as 0.05 mm or less, the correction device 1
In 3, the difference in bending strain between the core strand and the sheath strand when repeated bending by a roller or the like is applied is small, and straightness, twist, and the like can be effectively corrected.
【００２２】本発明におけるシース素線径ｄｓおよび撚
ピッチＰに関する上記の限定は、Ｍ並列＋Ｎ構造におけ
るコア素線とシース素線との荷重負担差を緩和する効果
もあり、強度発揮効率や耐久性に優れたスチールコード
とすることができる。The above limitation on the sheath wire diameter ds and the twist pitch P in the present invention also has the effect of alleviating the load-bearing difference between the core wire and the sheath wire in the M-parallel + N structure. A steel cord having excellent properties can be obtained.
【００２３】[0023]
【実施例】以下、本発明を実施例に基づき説明する。表
面に黄銅めっきを有し約０．８２重量％の炭素を含有す
る鋼線を素線とし、図２に示す製造方法に従い、下記の
表１に示す実施例１〜６のスチールコードおよび下記の
表２に示す比較例１〜５のスチールコードを夫々製造し
た。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments. A steel wire having a brass plating on its surface and containing about 0.82% by weight of carbon is used as a strand, and according to the manufacturing method shown in FIG. 2, the steel cords of Examples 1 to 6 shown in Table 1 below and Steel cords of Comparative Examples 1 to 5 shown in Table 2 were produced, respectively.
【００２４】表中、実施例１〜６は、本発明に従う２並
列＋８構造のスチールコードの例である。In the table, Examples 1 to 6 are examples of a steel cord having a 2-parallel +8 structure according to the present invention.
【００２５】比較例１は、撚ピッチＰが過大で、本発明
の範囲から逸脱している２並列＋８構造のスチールコー
ドの例である。Comparative Example 1 is an example of a steel cord having a two-parallel +8 structure in which the twist pitch P is excessive and deviates from the scope of the present invention.
【００２６】比較例２は、撚ピッチＰが過小で、本発明
の範囲から逸脱している２並列＋８構造のスチールコー
ドの例である。Comparative Example 2 is an example of a steel cord having a 2-parallel +8 structure in which the twist pitch P is too small and deviates from the scope of the present invention.
【００２７】比較例３は、シース素線径ｄｓがコア素線
径ｄｃに対して過小で、本発明の範囲から逸脱している
２並列＋８構造のスチールコードの例である。Comparative Example 3 is an example of a steel cord having a two-parallel +8 structure in which the sheath wire diameter ds is too small relative to the core wire diameter dc and deviates from the scope of the present invention.
【００２８】比較例４は、シース素線とシース素線が同
径で、本発明の範囲から逸脱している２並列＋８構造の
スチールコードの例である。Comparative Example 4 is an example of a steel cord having a two-parallel +8 structure in which the sheath wire and the sheath wire have the same diameter and deviate from the scope of the present invention.
【００２９】比較例５は、コア素線径ｄｃが過大で、本
発明の範囲から逸脱している２並列＋８構造のスチール
コードの例である。Comparative Example 5 is an example of a steel cord having a two-parallel + 8 structure in which the core strand diameter dc is excessively large and deviates from the scope of the present invention.
【００３０】これら実施例および比較例のスチールコー
ドについて、下記の各項目についての評価を行った。 （１）破断強力 ＪＩＳ Ｇ３５１０の切断荷重測定方法に準拠して測定
した。 （２）切断端部におけるシース回転量 スチールコードを刃物で切断した際の、シースの切断端
部の回転量にて評価した。 （３）ゴム侵入性 スチールコードを未加硫ゴム中に埋設し、１４５℃で４
５分間の加硫処理を施して評価サンプルを作成し、サン
プル中のスチールコードの横断面観察によりゴム侵入状
態を評価した。 （４）巻き癖 巻き胴直径が１２ｃｍのスプールに、巻取り張力約２５
Ｎにてスチールコードを巻取り、２週間放置後の巻き癖
の有無について評価した。With respect to the steel cords of these examples and comparative examples, the following items were evaluated. (1) Breaking strength Measured according to the cutting load measuring method of JIS G3510. (2) Sheath rotation amount at cut end The evaluation was made based on the rotation amount of the cut end of the sheath when the steel cord was cut with a blade. (3) Rubber penetration Steel cord is buried in unvulcanized rubber,
An evaluation sample was prepared by performing a vulcanization treatment for 5 minutes, and the state of rubber penetration was evaluated by observing the cross section of the steel cord in the sample. (4) Winding habit Winding tension of about 25 cm on a spool with a winding drum diameter of 12 cm
The steel cord was wound in N and evaluated for the presence or absence of a curl after being left for 2 weeks.
【００３１】得られた結果を下記の表１および表２に併
記する。The results obtained are shown in Tables 1 and 2 below.
【００３２】[0032]
【表１】 [Table 1]
【００３３】[0033]
【表２】 [Table 2]
【００３４】表１および表２に示すように、実施例１〜
６のスチールコードは、全ての評価項目について良好な
結果を示した。As shown in Tables 1 and 2, Examples 1 to
Steel cord No. 6 showed good results for all evaluation items.
【００３５】これに対し、撚ピッチＰが過大である比較
例１のスチールコードは、保形性が悪く、ゴム侵入性が
不十分であった。On the other hand, the steel cord of Comparative Example 1 in which the twist pitch P was too large was poor in shape retention and insufficient in rubber penetration.
【００３６】撚ピッチＰが過小である比較例２のスチー
ルコードは、切断端部におけるシース回転量が大きく、
コア素線同士の交差部も高い頻度で発生していた。ま
た、同様の素線を用いた実施例４のスチールコードに比
べ強度発揮効率が低く、若干低い破断強力を示した。The steel cord of Comparative Example 2 in which the twist pitch P is too small has a large amount of sheath rotation at the cut end,
Intersections between core strands also occurred frequently. The steel cord of Example 4 in which the same strand was used had a lower strength exhibiting efficiency and a slightly lower breaking strength.
【００３７】シース素線径ｄｓがコア素線径ｄｃに対し
て過小である比較例３のスチールコードは、切断端部に
おけるシース回転量が大きく、コア並列方向の捩れの残
留も認められた。In the steel cord of Comparative Example 3 in which the sheath wire diameter ds was too small with respect to the core wire diameter dc, the amount of rotation of the sheath at the cut end was large, and residual twist in the core parallel direction was also observed.
【００３８】コア素線とシース素線が同径である比較例
４のスチールコードは、ゴム侵入性が不十分であった。The steel cord of Comparative Example 4 in which the core wire and the sheath wire had the same diameter had insufficient rubber penetration.
【００３９】コア素線径ｄｃが過大である比較例５のス
チールコードは、巻き癖が発生した。The steel cord of Comparative Example 5 in which the core strand diameter dc was excessively had a curl.
【００４０】[0040]
【発明の効果】以上に説明したように、本発明のゴム物
品補強用スチールコードは、コア並列方向の捩れ、内部
トーションの残留、コア素線とシース素線との荷重負担
差の増大等の、従来のＭ並列＋Ｎ構造のスチールコード
の問題点を改善することができる。As described above, the steel cord for reinforcing rubber articles according to the present invention has advantages such as twisting in the core parallel direction, residual internal torsion, and an increase in the load bearing difference between the core wire and the sheath wire. The problem of the conventional steel cord having the M parallel + N structure can be improved.
【００４１】また、本発明のゴム物品補強用スチールコ
ードは、特にＴＢＲのベルト層の補強材として好適であ
り、捩れの少ないコア並列方向がタイヤのベルト層の幅
方向に沿うようにスチールコードを配列することによ
り、Ｍ並列＋Ｎ構造本来の特性が十分に発揮され、乗り
心地等を損なうことなく操縦安定性に優れ、軽量化され
たタイヤが得られる。The steel cord for reinforcing a rubber article of the present invention is particularly suitable as a reinforcing material for a belt layer of a TBR, and the steel cord is arranged such that the core-parallel direction with little twist is along the width direction of the belt layer of the tire. By arranging the tires, the original characteristics of the M-parallel + N structure can be sufficiently exhibited, and a tire with excellent steering stability and reduced weight can be obtained without impairing riding comfort.
【図１】本発明に従うスチールコードの斜断面図であ
る。FIG. 1 is an oblique sectional view of a steel cord according to the present invention.
【図２】２並列＋８構造のスチールコードの製造方法を
示す図である。FIG. 2 is a view showing a method of manufacturing a steel cord having a two-parallel +8 structure.
１ スチールコード ２ コア ２ａ コア素線 ２ｂ コア素線 ３ シース ４ シース素線 １０ 撚線機 １１ バレル １２ 撚合わせダイ １３ 矯正装置 DESCRIPTION OF SYMBOLS 1 Steel cord 2 Core 2a Core strand 2b Core strand 3 Sheath 4 Sheath strand 10 Twisting machine 11 Barrel 12 Twisting die 13 Straightening device
Claims (2)
素線を撚合わせずに長手方向に並列して配置してなるコ
アと、同じ直径ｄｓを有する８本のシース素線を前記コ
アの回りに撚合わせてなる１層のシースとによって構成
された、扁平な横断面輪郭を有するゴム物品補強用スチ
ールコードにおいて、 前記コア素線の直径ｄｃが０．３０ｍｍ以上かつ０．３
８ｍｍ以下、前記シース素線の直径ｄｓがｄｃ−０．０
１ｍｍ以下かつｄｃ−０．０５ｍｍ以上であり、前記シ
ース素線の撚ピッチＰがコア素線の直径ｄｃの５０倍以
上かつシース素線直径ｄｓの１２０倍以下であることを
特徴とするゴム物品補強用スチールコード。1. A core in which two straight core wires having the same diameter dc are arranged in parallel in the longitudinal direction without twisting, and eight sheath wires having the same diameter ds are arranged in the core. A steel cord for reinforcing a rubber article having a flat cross-sectional profile constituted by a single-layered sheath twisted around the core wire, wherein the core element wire has a diameter dc of 0.30 mm or more and 0.3 mm or more.
8 mm or less, the diameter ds of the sheath wire is dc-0.0
A rubber article having a length of 1 mm or less and dc-0.05 mm or more, and a twist pitch P of the sheath wire is 50 times or more of the diameter dc of the core wire and 120 times or less of the diameter ds of the sheath wire. Steel cord for reinforcement.
以上かつ０．３６ｍｍ以下、前記シース素線の直径ｄｓ
がｄｃ−０．０１ｍｍ以下かつｄｃ−０．０３ｍｍ以上
であり、前記撚ピッチＰがコア素線径ｄｃの６０倍以上
かつシース素線直径ｄｓの９０倍以下である請求項１記
載のゴム物品補強用スチールコード。2. The diameter dc of the core strand is 0.32 mm.
Not less than 0.36 mm, the diameter ds of the sheath wire
Is less than or equal to dc-0.01 mm and not less than dc-0.03 mm, and the twist pitch P is not less than 60 times the core wire diameter dc and not more than 90 times the sheath wire diameter ds. Steel cord for reinforcement.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16886098A JP4050827B2 (en) | 1998-06-16 | 1998-06-16 | Steel cord for rubber article reinforcement |
| ES99304192T ES2204069T3 (en) | 1998-06-16 | 1999-05-28 | STEEL CABLE INTENDED FOR REINFORCEMENT OF RUBBER ITEMS. |
| DE69909561T DE69909561T2 (en) | 1998-06-16 | 1999-05-28 | Steel cables for reinforcing rubber articles |
| EP99304192A EP0969140B1 (en) | 1998-06-16 | 1999-05-28 | Steel cords for the reinforcement of rubber articles |
| US09/332,136 US6182433B1 (en) | 1998-06-16 | 1999-06-14 | Steel cords for the reinforcement of rubber articles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16886098A JP4050827B2 (en) | 1998-06-16 | 1998-06-16 | Steel cord for rubber article reinforcement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000008282A true JP2000008282A (en) | 2000-01-11 |
| JP4050827B2 JP4050827B2 (en) | 2008-02-20 |
Family
ID=15875911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16886098A Expired - Fee Related JP4050827B2 (en) | 1998-06-16 | 1998-06-16 | Steel cord for rubber article reinforcement |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4050827B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030041072A (en) * | 2001-11-19 | 2003-05-23 | 한국타이어 주식회사 | Steel cord for use in pneumatic radial tire |
| WO2007026825A1 (en) * | 2005-09-01 | 2007-03-08 | Bridgestone Corporation | Steel cord for reinforcing rubber article and pneumatic tire |
| WO2015151666A1 (en) * | 2014-04-03 | 2015-10-08 | 株式会社ブリヂストン | Steel cord for reinforcing rubbery articles |
| WO2018025753A1 (en) * | 2016-08-05 | 2018-02-08 | 株式会社ブリヂストン | Tire steel cord and pneumatic tire using same |
| JP2018021285A (en) * | 2016-08-05 | 2018-02-08 | 株式会社ブリヂストン | Pneumatic tire |
| WO2018025754A1 (en) * | 2016-08-05 | 2018-02-08 | 株式会社ブリヂストン | Pneumatic tire |
-
1998
- 1998-06-16 JP JP16886098A patent/JP4050827B2/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030041072A (en) * | 2001-11-19 | 2003-05-23 | 한국타이어 주식회사 | Steel cord for use in pneumatic radial tire |
| WO2007026825A1 (en) * | 2005-09-01 | 2007-03-08 | Bridgestone Corporation | Steel cord for reinforcing rubber article and pneumatic tire |
| WO2015151666A1 (en) * | 2014-04-03 | 2015-10-08 | 株式会社ブリヂストン | Steel cord for reinforcing rubbery articles |
| JP2015196935A (en) * | 2014-04-03 | 2015-11-09 | 株式会社ブリヂストン | Steel cord for rubber commodity reinforcement |
| WO2018025753A1 (en) * | 2016-08-05 | 2018-02-08 | 株式会社ブリヂストン | Tire steel cord and pneumatic tire using same |
| JP2018021285A (en) * | 2016-08-05 | 2018-02-08 | 株式会社ブリヂストン | Pneumatic tire |
| WO2018025754A1 (en) * | 2016-08-05 | 2018-02-08 | 株式会社ブリヂストン | Pneumatic tire |
| JP2018020746A (en) * | 2016-08-05 | 2018-02-08 | 株式会社ブリヂストン | Pneumatic tire |
| JP2018021284A (en) * | 2016-08-05 | 2018-02-08 | 株式会社ブリヂストン | Steel cord for tire and pneumatic tire therewith |
| WO2018025755A1 (en) * | 2016-08-05 | 2018-02-08 | 株式会社ブリヂストン | Pneumatic tire |
| EP3495165A4 (en) * | 2016-08-05 | 2019-06-12 | Bridgestone Corporation | Pneumatic tire |
| US11518193B2 (en) | 2016-08-05 | 2022-12-06 | Bridgestone Corporation | Tire steel cord and pneumatic tire using same |
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|---|---|
| JP4050827B2 (en) | 2008-02-20 |
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