Metal cord thread and rubber tire

Abstract

The invention discloses a metal cord thread. The metal cord thread is made of a plurality of strands twisted according to the twisting length of the cord thread, each strand is composed of a plurality of metal wires according to the twisting length of the strands, elongation at break of the metal cord thread is not smaller than 5%, the strands have a strand twisting angle and the metal cord thread has a cord thread twisting angle. The sum of the strand twisting angle and the cord thread twisting angle ranges from 20 degrees to 29 degrees, the structural elongation of the metal cord thread is not smaller than 2.0%; when the sum of the strand twisting angle and the metal cord thread twisting angle ranges from 30 degrees to 38 degrees, the structural elongation of the metal cord thread is not smaller than 2.5%; when the sum of the strand twisting angle and the metal cord thread twisting angle ranges from 39 degrees to 48 degrees, the structural elongation of the metal cord thread is not smaller than 3.0%. Preferably, the structural elongation of the metal cord thread is not larger than 4.0%. The metal cord thread has the advantages of high elongation at break, high structural elongation and high rubber permeability. The invention further relates to a rubber tire comprising the metal cord thread.

Description

technical field [0001] The present invention relates to a metal cord, and also to a rubber tire comprising the metal cord. Background technique [0002] It is well known that the use of steel cords to reinforce rubber products, especially tire products, is used in a wide range of applications. "High elongation steel cord", as a member of the steel cord family, is generally used to reinforce the zero-degree belt and protective layer of tires. The so-called "high elongation steel cord" generally means that the elongation at break of the steel cord is not less than 5%. Elongation at break (δ) is one of the indicators describing the plastic properties of materials. The elongation at break is the percentage of the ratio of the total deformation ΔL of the gauge section after tensile fracture to the original gauge length L: δ=ΔL / L×100%. The elongation at break of a steel cord includes the structural elongation of the steel cord itself, e.g. for a "high elongation steel cord", wh...

AI Technical Summary

Problems solved by technology

As mentioned above, the structural elongation (2.25%) of the traditional high-strength steel cord structure 3×7×0.20mm cannot meet the requirements for the preparation of ultra-wide tires. If a higher structural elongation is obtained, the steel cord is easily broken. Even if it does not break by luck, the mechanical properties of the steel cord itself, such as fatigue and breaking force, will be greatly affected, and the service life will be greatly reduced.

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