【発明の詳細な説明】[Detailed description of the invention]
（産業上の利用分野）
本発明は可塑物補強用にふさわしいスチールコ
ードに関する。
（従来の技術）
可塑物がタイヤである場合、そのカーカスに埋
設される補強用スチールコードには引張力と同時
に優れた曲げ疲労特性及び可塑物の侵入性が要求
される。
この点、第１０図及び第１１図（特開昭57−
193253号）に示す従来品は一長一短があつて、曲
げ疲労特性又は侵入性のいずれかを優先せざるを
得ない問題がある。
即ち、前者の１×５は曲げ疲労特性が優れてい
るものの可塑物の侵入性が劣る構造上の問題があ
り、一方後者の２＋２は侵入性については良好で
あるが、曲げ疲労特性は第８図のグラフに示す通
り前者よりも劣る問題を有している。
特に、タイヤの場合では曲げ疲労特性、ゴムの
侵入性いずれをとつても重要であり、にもかかわ
らず双方を満足するスチールコードは未だ提案さ
れていない。
（発明が解決しようとする問題点）
本発明が解決しようとする問題点は、引張力は
もとより、曲げ疲労特性及びゴムの侵入性さらに
ゴムとの結合性共に優れていて、可塑物例えばタ
イヤ等の補強用に好適であるスチールコードを提
供することにある。
（問題点を解決するための手段）
本発明が叙上の問題点を解決するために講じた
手段は、二本組の素線群と三本組の素線群との撚
り構造で、二本組の素線群がコード方向にパラレ
ル状を呈し、三本組の素線群が二本組の素線群に
対して半ピツチ毎に大略傘形状、大略倒傘形状に
交互して撚り合つて成る構成としたことを特徴と
する。
（実施例）
以下、図面に基づいて本発明の実施の一例を詳
細に説明する。
図中Ａはスチールコードであり、このスチール
コードＡは二本組の素線群１と三本組の素線群２
との撚り構造で、二本組の素線群１がコード方向
にパラレル状を呈し、三本組の素線群２が二本組
の素線群１に対して半ピツチ毎に大略傘形状、大
略倒傘形状に交互して撚り合つている。
具体的には、二本組の素線群１と三本組の素線
群２との撚り状態は、二本組の素線群１に対して
三本組の素線群２が大略傘形状に撚り合つている
状態を撚り角0゜（第２図）とすれば、90゜角では素
線群１の右側に素線群２が並列状に撚り合い（第
３図）、180゜角では大略倒傘形状に撚り合い（第
４図）、270゜角では素線群１の左側に素線群２が
並列状に撚り合い（第５図）、360゜角では再び大
略傘形状に撚り合つている。
次表に本発明の実施データーを従来品と共に示
し、且つ曲げ疲労特性及びゴムの侵入率を比較し
て示す。
(Industrial Field of Application) The present invention relates to a steel cord suitable for reinforcing plastics. (Prior Art) When the plastic material is a tire, the reinforcing steel cord embedded in the carcass is required to have not only tensile strength but also excellent bending fatigue properties and plastic material penetration. In this regard, Fig. 10 and Fig.
The conventional product shown in No. 193253) has both advantages and disadvantages, and there is a problem in that it requires giving priority to either bending fatigue properties or invasiveness. That is, the former 1×5 has excellent bending fatigue properties, but has a structural problem of poor plastic material penetration, while the latter 2+2 has good bending fatigue properties, but the bending fatigue properties are poor. As shown in the graph in the figure, the problem is worse than the former. In particular, in the case of tires, both bending fatigue properties and rubber penetration are very important, and yet no steel cord has yet been proposed that satisfies both. (Problems to be Solved by the Invention) The problems to be solved by the present invention are that it has excellent not only tensile strength but also bending fatigue properties, rubber penetration properties, and bondability with rubber, and is suitable for plastics such as tires, etc. An object of the present invention is to provide a steel cord suitable for reinforcing. (Means for solving the problems) The means taken by the present invention to solve the above-mentioned problems is a twisted structure of two sets of strands and three sets of strands. The strands of this set exhibit a parallel shape in the cord direction, and the 3-strand strands of strands are twisted alternately in a roughly umbrella shape and a roughly inverted umbrella shape every half pitch with respect to the 2-strands of strands. It is characterized by having a configuration consisting of two parts. (Example) Hereinafter, an example of implementation of the present invention will be described in detail based on the drawings. A in the figure is a steel cord, and this steel cord A consists of a two-wire group 1 and a three-wire group 2.
With the twisted structure, the two sets of strands 1 are parallel in the cord direction, and the three strands of the strands 2 are approximately umbrella-shaped at every half pitch with respect to the two strands of the strands 1. , which are twisted alternately in a roughly inverted umbrella shape. Specifically, the twisted state of the two-strand wire group 1 and the three-strand wire group 2 is such that the three-strand wire group 2 is almost an umbrella for the two-strand wire group 1. If the twist angle is 0° (Fig. 2) when the wires are twisted in a shape, then at a 90° angle, strand group 2 is twisted in parallel on the right side of strand group 1 (Fig. 3), and the angle is 180°. At the corner, the wires are twisted together in a roughly inverted umbrella shape (Fig. 4), at the 270° angle, the wire group 2 is twisted in parallel to the left of the wire group 1 (Fig. 5), and at the 360° angle, the shape is roughly an umbrella shape again. They are twisted together. The following table shows implementation data of the present invention together with conventional products, and also shows a comparison of bending fatigue properties and rubber penetration rate.
【表】
尚、比較のために各品の引張力を一定にしてい
る。
次に、本発明スチールコードＡを撚り装置Ｂに
より撚り成形する具体例について説明する。
撚り装置Ｂは第１バンチヤー機B1と第２バン
チヤー機B2からなり、素線群２の構成素線数と
同数の３個の供給ボビン１０から各素線２ａを引
出してガイドローラー１１を経て計尺ホイール１
２に通す一方で第１バンチヤー機B1側からは素
線群１の構成素線数と同数の２個の供給ボビン１
３から引出した各素線１ａをガイドローラー１
４、第１撚ターンローラー１５、ガイド１６、第
２撚ターンローラー１７に通してＺ撚りのピツチ
10mmに撚つた後に計尺ホイール１２に通す。これ
らの素線群１，２は鏡板１８、ボイス１９、OT
装置２０に順に通し、次いで第２バンチヤー機
B2即ち、第１撚ターンローラー２１、ガイド２
２、第２撚ターンローラー２３、OT装置２４、
キヤプスタン２５、トラバーサー２６に通して、
素線群１の撚りを撚り戻してパラレル上にすると
共に、このパラレル上の素線群１と素線群２とを
Ｓ撚りのピツチ10mmに撚り仕上げ、斯く成形した
スチールコードＡを巻取りボビン２７に巻取る。
斯るシステム装置Ｂにより、素線群１を第１バ
ンチヤー機B1側で、第２バンチヤー機B2側と逆
撚りのＺ撚りに予め撚つておくことにより、第２
バンチヤー機B2側でパラレル状に撚り戻して連
続撚り成形することができる。
（発明の効果）
従つて、本発明によれば次の利点がある。
従来品と同じ引張力で、曲げ疲労特性及び柔
軟性並びに可塑物の侵入性共に優れていて、特
にタイヤ等の可塑物補強用として好適である。
断面構造における空間部が少なく、そして侵
入性が良好であることと相俟つて殆んど発錆の
心配がない。
断面構造の異形度合が大きく、特に、半ピツ
チ毎に交互する断面大略傘形状部と断面大略倒
傘形状部が軸線を挾んで斜めに対向して、それ
ぞれが錨の如く可塑物を喰え込むことになるた
め、可塑物との間の線、径方向のズレが抑止さ
れて、可塑物との結合性に富むものである。[Table] For comparison, the tensile force of each product is kept constant. Next, a specific example in which the steel cord A of the present invention is twisted and formed by the twisting device B will be described. The twisting device B consists of a first buncher machine B 1 and a second buncher machine B 2 , and each strand 2a is pulled out from three supply bobbins 10, the number of which is the same as the number of strands constituting the strand group 2, and the guide roller 11 is pulled out. Measuring wheel 1
2, while from the first bunchier machine B 1 side, two supply bobbins 1 of the same number as the number of strands constituting strand group 1 are passed through the first buncher machine B 1.
Each strand 1a pulled out from the guide roller 1
4. The pitch of the Z twist is passed through the first twist turn roller 15, the guide 16, and the second twist turn roller 17.
After twisting it to 10 mm, pass it through the measuring wheel 12. These wire groups 1 and 2 are the mirror plate 18, the voice 19, and the OT.
through the apparatus 20 and then the second buncher machine.
B 2 , that is, the first twisting turn roller 21, the guide 2
2, second twisting turn roller 23, OT device 24,
Pass it through the capstan 25 and traverser 26,
Untwist the strands of wire group 1 to make them parallel, finish twisting the parallel strands 1 and 2 to an S twist pitch of 10 mm, and wind the steel cord A formed in this way onto a bobbin. Wind it up to 27. By using such a system device B, the wire group 1 is pre-twisted in Z-twisting on the side of the first buncher machine B 1 and on the side of the second buncher machine B 2.
It can be untwisted in parallel on the Buncher machine B2 side to form continuous twisting. (Effects of the Invention) Therefore, the present invention has the following advantages. With the same tensile strength as conventional products, it has excellent bending fatigue properties, flexibility, and plastic material penetration, and is particularly suitable for reinforcing plastic materials such as tires. There are few spaces in the cross-sectional structure, and the penetration is good, so there is almost no fear of rust. The degree of irregularity in the cross-sectional structure is large, and in particular, the approximately umbrella-shaped sections and approximately inverted umbrella-shaped sections that alternate at every half pitch face diagonally across the axis, and each bites into the plastic material like an anchor. Therefore, deviations in the line and radial directions between the plastic material and the plastic material are suppressed, and the bonding property with the plastic material is enhanced.
【図面の簡単な説明】[Brief explanation of the drawing]
第１図は本発明スチールコードを例示する正面
図。第２図は−線に沿える拡大断面図。第３
図は−線に沿える拡大断面図。第４図は−
線に沿える拡大断面図。第５図は−線に沿
える拡大断面図。第６図は−線に沿える拡大
断面図。第７図は−線に沿える拡大断面図。
第８図は本発明品と従来品の曲げ疲労特性を示す
グラフ。第９図は本発明品を撚り合わせる装置を
例示した概略図。第１０図及び第１１図は従来品
を示す拡大断面図である。
図中、Ａはスチールコード、１は二本組の素線
群、２は三本組の素線群。
FIG. 1 is a front view illustrating the steel cord of the present invention. FIG. 2 is an enlarged sectional view taken along the - line. Third
The figure is an enlarged sectional view taken along the - line. Figure 4 is -
Enlarged cross-sectional view along the line. FIG. 5 is an enlarged sectional view taken along the - line. FIG. 6 is an enlarged sectional view taken along the - line. FIG. 7 is an enlarged sectional view taken along the - line.
FIG. 8 is a graph showing the bending fatigue characteristics of the product of the present invention and the conventional product. FIG. 9 is a schematic diagram illustrating an apparatus for twisting products of the present invention. FIGS. 10 and 11 are enlarged sectional views showing conventional products. In the figure, A is a steel cord, 1 is a group of two wires, and 2 is a group of three wires.