Steel cord for tire reinforcement
AssigneeHongduk Industrial Co., Ltd.
InventorsByung Ho LEE, Kwang Jin Lee, Do Hun Kim
Life of this patent
Estimating the term…
Abstract
A steel cord for a tire reinforcement having a non-circular cross-section includes: a lower strand; and an upper strand that surrounds an outer circumferential surface of the lower strand so as to have an m+n structure, wherein the lower strand includes a plurality of core wires, each of the plurality of core wires have a flat surface on a portion in which the plurality of the core wires come into contact with each other, and the plurality of core wires come into surface contact with each other through the flat surface.
Claims11
A steel cord for a tire reinforcement having a non-circular cross-section, the steel cord comprising:
- a lower strand;
- and
- an upper strand that surrounds an outer circumferential surface of the lower strand so as to have an m+n structure,
- wherein the lower strand comprises a plurality of core wires, each of the plurality of core wires have a flat surface on a portion in which the plurality of the core wires come into contact with each other, and the plurality of core wires come into surface contact with each other through the flat surface, and
- wherein the upper strand comprises about 2 to about 20 element wires, and the element wires are stranded so as to surround the outer circumferential surface of the lower strand with respect to a central axis, that is, an axis of a length direction of the lower strand.
A method of manufacturing a steel cord for a tire reinforcement comprising a lower strand formed by stranding a plurality of core wires and an upper strand formed by stranding a plurality of element wires and stranded on an outer surface of the lower strand, the method comprising:
- twisting the plurality of element wires constituting the upper strand by rotating a rotary wheel of an upper strand supplier;
- unbraiding the plurality of element wires in an unbraiding machine;
- supplying the lower strand in a middle strand supplier;
- and
- stranding the upper strand on the lower strand by rotating the rotary wheel.
Dependencies are inferred from the claim text.