JPS58180690A - Steel cord for reinforcing rubber structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a rubber structure used as a reinforcing material for tires, belts, etc. This is about JM heavy-duty steel cord (hereinafter simply referred to as steel cord).◎In general, the steel cord of this gutter is bare! It is made up of a plurality of I twisted together.

Then, the steel cords are stretched parallel to each other and tied to a rubber material, and are used as reinforcing materials for tires, belts, etc.

In this way, the essential requirements when steel cord is used as the M-strength material of a rubber structure are that it must be chemically treated as a rubber material, and that the inside of the steel cord must be treated as a rubber material. The rubber material penetrates well, and the grooves are embedded in the rubber material and have some elasticity in the longitudinal direction.

That is, in order for the steel cord to fully function as a reinforcing material, it is necessary that the steel cord and the rubber material form a complete composite.

For example, when used in tires, if the adhesion between the steel cord and the rubber material and the penetration of the rubber material into the steel cord are poor, the steel cord and the rubber material may separate when the car is running, which can cause the so-called separation phenomenon. In addition to significantly impeding the function of the tire, the steel cord's strands become rusted due to the O moisture in the rubber and the moisture that enters through the rubber cutting flaws, greatly reducing the strength of the steel cord. However, this has the disadvantage of accelerating the separation phenomenon described above. In addition, if the elasticity of the steel cord is low, the rubber material itself is a highly elastic material, so when the tire rides on a stone on the road surface, the steel cord will not follow the elastic deformation of the rubber and will break. There is.

However, the conventional steel cord is the first bad thing) (b))
As shown in K, a steel cord 1 is constructed by twisting several M2fr elements with scissors.

The steel cord 1 mentioned above is buried and tightly adhered to each other, so that when it is covered with rubber material, the rubber material does not penetrate to the center of the steel cord, and there is no space in the center of the steel cord 1. There was a drawback that the adhesion of the rubber material to the rubber surrounding the entire circumference of *1 m 2 O was insufficient, and the elasticity was not sufficiently satisfactory.

The present invention has been made in order to eliminate the above-mentioned drawbacks, so 69
, a strand consisting of two or more twisted strands of the same diameter, and a bundle of a plurality of strands of the same diameter as the strands constituting the single or untwisted strand, It promotes the MN between the rubber material and the steel cord, and provides a steel cord with elasticity in the longitudinal direction. ◎The strands used in the present invention are No. 4! j!
A particularly suitable range is a fin diameter of α15 to α50.

Note that the surface is usually plated with steel alloy or the like to improve adhesion to the rubber material.

The significance of constituting the twisted strand and the wire diameter of a single wire or a bundle of untwisted wires may be the same or may be the same.

Furthermore, the twist direction and twist pitch of the strand and the cord must be such that at least one of them is uniform, that is, the twist direction and the twist pitch can be appropriately selected as long as they are not both the same. However, it is more effective to set the strand pitch to 80% or less of the cord pitch, preferably in the same direction, and to set the pitch length in the range of 5M to 25N4. The reason is that when twisting with a puncher and untwisting machine, etc., it is easier to twist in the same direction, and from the viewpoint of shape stability as a cord and rubber penetration resistance, it is better to use the above-mentioned twist pitch. Because there is.

Note that these twisted strands and an untwisted strand bundle consisting of one strand or two or more strands of the same diameter must be mutually twisted; for example, one of them must be twisted together. The other circumference vOIiK should not be wrapped or wrapped.

This is because elasticity in the longitudinal direction cannot be expected in this state.

An embodiment of the present invention will be described below with reference to the drawings.

Example 1 FIGS. 2(a) and 2(b) are a sectional view and a schematic configuration diagram showing an example of the steel cord of the present invention, with a 5fi diameter of 0.2
Toshi with 5M strands, these 2 heather strands 5. Me twisted ship 511. Strand 4 by twisting them together to form an S twist.
1", form this strand 4 and 1 with a bulk diameter of 040
The steel cord 6 is constructed by twisting the real strands 5 to a twist pitch of 10U and 81 twists.

Next, the steel cord 6 of the present invention and the conventional structure shown in 1
Table 1 shows a comparison of the physical properties with I and S twisted steel cords.

Table 1 The steel cord of the present invention is superior to conventional steel cords in terms of rubber penetration rate (rubber penetration cross-sectional area/rubber penetration possible cross-sectional area) x 100, fatigue resistance, and elastic modulus. In particular, this embodiment has a very large effect in that even if the number of strands is reduced, the quality is the same or higher.

Example 2 The third example (b)) shows the steel cord of a different example, 6 is a diameter [125 deception, and these two CDs
-Al1! As1kl&F) Twist 9 is combined so that the pitch is 5 and Sml+ to form strand 4, and this strand 4 and the twisted strand 7 whose mark is α25
The steel cord 9 is made by twisting the steel cord 9 with a C-less nest gland bundle 8 and a 0■ pitch of 1011 to form an S-twist.

Similar to Example 1, the physical properties of this steel cord and conventional steel cord are compared in Table 2. As is clear from the table above, steel cord 4 of Example 2 has almost the same properties as Example 1. The same effect was achieved.

In addition, as is clear from the cross-sectional view in the above-mentioned Jifou Example 2,
Space B will be created as shown in Figure 5 B),
This space 1 contains the conventional steel cord and various chapters @
7 are not aligned and are not in close contact with each other, so rubber material can easily enter from the outside.

As described above, since the steel cord wire according to the present invention has a structure that is completely different from the conventional structure, the penetration of rubber into the interior of the steel cord is improved, and the adhesion with 91 rubber is greatly improved. In addition, since the longitudinal direction zero injection performance of the steel cord is improved, the ability to follow the elastic deformation of the rubber is improved, and the steel cord O fractures are greatly reduced.
The effects are significant, such as improved tire performance.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional steel cord, Figure 2 shows an example of the steel cord developed in this study, and Figure 1 is a cross-sectional view of a conventional steel cord.
← is a 111i8 ellipse diagram, the fifth problem shows another practical example of the steel cord of the present invention, 〇〕 is a sectional view, and 〇) is a route configuration diagram. 1.6.9...Steel cord 2.3.5.7...g? IjA 4...Strand 8...Cable m end Patent applicant Hiroshi Kanai

Claims (1)

[Claims] A cord is constructed by twisting together two or more twisted strands of strands of the same diameter and an untwisted bundle of wires consisting of one sugan or two or more strands of the same diameter. A steel cord for reinforcing a rubber structure, characterized in that at least one of the twist, direction, and twist pitch of the strands and the cord are made true.