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Composite cord and tire using same

A composite cord and cord technology, applied in the field of composite cords, can solve problems such as poor adhesion of aramid fibers, and achieve the effects of reducing handling stability and improving adhesion

Active Publication Date: 2021-05-07
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, aramid fiber also has the disadvantage of poor adhesion to rubber in its molecular structure.
Therefore, the composite cord tends to cause rubber peeling during driving, and there is room for improvement in tire durability, especially high-speed durability.

Method used

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  • Composite cord and tire using same
  • Composite cord and tire using same
  • Composite cord and tire using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0077] In order to confirm the effects of the present invention, composite cords were trial-produced with the specifications shown in Table 1, and a pneumatic tire (265 / 35R18) using the trial-produced composite cords as belt cords was formed. Then, the cord strength and rubber pullout resistance of each composite cord were measured. In addition, steering stability and high-speed durability were measured for each pneumatic tire. The specifications of the pneumatic tires are substantially the same except for the belt cord (composite cord). Embodiment 2 and Embodiment 3 are only different in the number of twists.

[0078] L0 (the length of the outer circumference of the cord along the exposed surface of the composite cord) and L2 (the length of the outer circumference of the cord along the exposed surface of the second strand) are the cross-sections of the composite cord with FIB, and then used The cross-section of the composite cord acquired by SEM is obtained through image an...

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PUM

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Abstract

A composite cord 10 according to the present invention is composed of two first strands 11 that are formed of aramid fiber and one second strand 12 that is formed of nylon fiber. In a cross-section that is perpendicular to the length direction, the ratio of the length L2 of an exposed surface 12S of the second strand 12 along the outer cord periphery to the length L0 of an exposed surface 10S of the composite cord 10 along the outer cord periphery, namely L2 / L0 is within the range of 0.30-0.40.

Description

technical field [0001] The present invention relates to a composite cord having improved adhesion to rubber and a tire using the same. Background technique [0002] In the following Patent Document 1, a pneumatic tire is proposed that uses the following composite cord as a belt cord: a plurality of, for example, two first strands made of aramid fibers, and one second strand made of nylon fibers. Composite cords made of stranded wires. [0003] The composite cord can increase the rigidity of the tire and improve the steering stability of the tire through the high elasticity characteristic of the aramid fiber. In addition, by using the second strand of nylon fiber in combination, it is possible to suppress fracture damage due to compression fatigue, which is a disadvantage of aramid fiber. [0004] However, aramid fiber also has the disadvantage of poor adhesion to rubber in its molecular structure. Therefore, the composite cord tends to cause rubber peeling during running,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C9/00D02G3/04D02G3/28D02G3/48
CPCD02G3/48B60C9/0042B60C9/005B60C2009/0092B60C2009/0085B60C9/2009B60C9/2204B60C2009/2214B60C2009/2285D10B2331/02D10B2331/021D02G3/047
Inventor 吉住拓真
Owner SUMITOMO RUBBER IND LTD
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