Fully rubber-penetrated steel cord and production method

By optimizing the relationship between the diameter and twist pitch of the core strand and the outer winding steel wire, and by applying different torsional stresses to the core strand before winding, the problems of uneven core strand twisting and differences in bending stiffness were solved, the glue penetration rate and strand permeability of the steel cord were improved, and the risk of core strand protrusion was reduced.

WO2026123400A1 Publication Date: 2026-06-18JIANGSU XINGDA STEEL TYPE CORD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
JIANGSU XINGDA STEEL TYPE CORD
Filing Date
2024-12-23
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

In the production of fully rubber-insulated steel cords, the uneven twisting of the core strands and the difference in bending stiffness between the core strands and the outer windings result in poor continuity and core strand protrusion problems during use.

⚗Method used

By designing the relationship between the diameter and twist of the core strand and the outer winding steel wire, the bending stiffness of the core strand is made to meet the bending stiffness of the outer winding steel wire by 0.9 to 1.76 times. Different torsional stresses are applied to the core strand steel wire before winding to ensure that the cross-sectional metal filling rate of the steel cord reaches more than 60%, while maintaining a spacing of at least 20μm between the outer winding steel wires.

🎯Benefits of technology

It increases the rubber penetration rate of steel cord, reduces core strand twisting defects, increases the continuity and flatness of the cord, and reduces the risk of core strands curling up in tires.

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Abstract

A fully rubber-penetrated steel cord and a production method. The steel cord comprises a core strand composed of two steel wires having a diameter of d1 and N wrap steel wires having a diameter of d2 spirally wound on the core strand, wherein the two steel wires of the core strand in the steel cord have different torsional stresses before being wound by the N steel wires on the outer layer; the diameter of the core strand and the diameter of the wrap steel wires meet a set interval, so that the bending rigidity of the core strand meets 0.9-1.76 times of the bending rigidity of the wrap steel wires; the section metal filling rate D of the steel cord is greater than a set threshold; and a spacing H is formed between the wrap steel wires. By means of the diameter design and production process design of the steel wires of the core strand and the wrap steel wires, the generation of core strand defects during production of steel cords is avoided, and the continuity of the cords during use is increased.
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