Abstract:
Disclosed is a tire-reinforcing steel cord for a radial tire. The tire-reinforcing steel cord has a double layer structure including a first-layer core (1) and a second-layer core (2) provided on the surface of the first-layer core (1). The first-layer core (1) has an elliptical or rectangular cross section. The tire-reinforcing steel cord can improve processability, fatigue characteristics, and rolling resistance performance of a tire, resulting in improved fuel efficiency. A radial tire using the tire-reinforcing steel cord is also disclosed.
Abstract:
A composite hybrid cord comprising a core comprising of a first bundle of synthetic filaments having a filament tenacity of from 10 to 40 grams per decitex and a plurality of cabled strands helically wound around the core, each cabled strand comprising of a plurality of metal strands helically wound around a center second bundle of synthetic filaments that have a filament tenacity of from 10 to 40 grams per decitex. The ratio of the largest cross sectional dimension of the first bundle of synthetic filaments to the largest cross sectional dimension of the second bundle of synthetic filaments is from 1.5:1 to 20:1. The metallic filaments of the cabled strands have an elongation at break that is no more than 24 percent different from the elongation at break of the synthetic filaments of the first and second bundles.
Abstract:
A steel cord (20) comprises a plurality of steel filaments (22, 24) arranged in parallel to the longitudinal axis of the steel cord (20) without twisting. The steel cord (20) further comprises a wrapping filament (26) twisted around the steel cord (20). Each of said steel filaments (22, 24) is a flat wire having flat surfaces. The steel filament (24) near the center of the steel cord (20) has a bigger width than the steel filaments (22) further away from the center of the steel cord (20) such that the cross-section of said steel cord (20) approximates an oval shape with the bending stiffness around the shorter axis of the oval shape being greater than the bending stiffness around the longer axis. In a tire, the steel cord being used as a reinforcement, the longer axis being arranged perpendicular to the radial direction of the tire.
Abstract:
A steel cord (10) adapted for the reinforcement of rubber products, the steel cord comprises a core (12) and a layer of filaments (14) with round cross-sections twisted around the core (12). The core (12) comprises a flat wire at a waveform, which lies in the plane of the flat wire. The wire is obtainable by first crimping a round wire and thereafter flattening the crimped wire. The filaments of the layer do not substantially contact each other to make spaces between each other to insure adequate rubber penetration into the cords. The steel cord has improvements on elongation at break.
Abstract:
A steel structure adapted for the reinforcement of elastomers, said steel reinforcement comprising one or more steel filaments (10). At least one of said steel filaments (10) is provided with a first crimp and a second crimp. The first crimp lies in a plane that is substantially different from the plane of the second crimp. Applying both crimps can be done in an efficient way by means of two pairs (12, 14) of toothed wheels which are not externally driven. By means of these crimps it is possible to obtain steel structures with an increased penetration of rubber or with an increased elongation at break.
Abstract:
A steel cord (1) comprising a core (3) formed by bundling three or more filaments (2) side by side without twisting and a sheath (5) of at least one layer comprised of plural filaments (4) wound around the core, characterized in that an arrangement of the filaments (2) constituting the core (3) at a section perpendicular to a longitudinal direction of the core differs between at least a part in the longitudinal direction of the core and the other part thereof, and all filaments (2) constituting the core (3) in all section parts are arranged in a rectangle having a long side of d x (n+1) and a short side of d x (1+1/2 1/2 ) when the diameter of the filament is d and the number of the filaments in the core is n. Such steel cords are used in a belt of a pneumatic tire. Also, these cords are produced by a tubular-type twisting machine having a specified structure.
Abstract:
A steel cord (1) comprising a core (3) formed by bundling three or more filaments (2) side by side without twisting and a sheath (5) of at least one layer comprised of plural filaments (4) wound around the core, characterized in that an arrangement of the filaments (2) constituting the core (3) at a section perpendicular to a longitudinal direction of the core differs between at least a part in the longitudinal direction of the core and the other part thereof, and all filaments (2) constituting the core (3) in all section parts are arranged in a rectangle having a long side of d x (n+1) and a short side of d x (1+1/2 1/2 ) when the diameter of the filament is d and the number of the filaments in the core is n. Such steel cords are used in a belt of a pneumatic tire. Also, these cords are produced by a tubular-type twisting machine having a specified structure.