Provided is an elastomer reinforcement cord which takes advantage of characteristics of a composite cord using steel filaments and a resin filament and in which a diameter (a geometrically calculated value) of the cord including only the steel filaments without resin, as calculated from a wire diameter of the steel filaments used, is substantially the same as an actual cord diameter after vulcanization. In an elastomer reinforcement cord 10 including a core and at least one sheath layer, in which metal filaments 2 and 3 and a resin filament 1 are twisted together, gaps between the metal filaments are filled with resin. The diameter of the cord is from 98 to 100.5% of the geometrically calculated value of the diameter of the cord including only the metal filaments, and a total length of gaps between the metal filaments forming an outermost sheath layer before vulcanization is 85% or less of the geometrically calculated value. In a region surrounded by connecting the center of each metal filament forming the outermost sheath layer on a cross section in a direction orthogonal to an axial direction of the cord, the ratio of a polymer material to a region other than the region occupied by the metal filaments is from 52 to 120%.

Provided is a steel cord for reinforcing a rubber article which can further improve cut resistance when applied to a tire while maintaining the amount of steel to be used. A steel cord for reinforcing a rubber article comprising: one core strand 11 having a two-layered layered-twisted structure formed by twisting a plurality of steel filaments 1; and a plurality of sheath strands 12 having a layered-twisted structure formed by twisting a plurality of steel filaments 2, wherein the sheath strands are twisted around the core strand. A ratio dc/ds of a diameter dc of a sheath filament constituting the sheath of the core strand to a diameter ds of an outermost layer sheath filament constituting the outermost layer sheath of the sheath strand is more than 1.25 and not more than 1.50.

A two-layer multi-strand cord (60) comprises an internal layer (CI) of the cord made up of J>1 internal strands (TI) and an external layer (CE) of the cord made up of L>1 external strands (TE). The cord satisfies the relationship 95MC175, where MC=(JMI+LME)/(J+L); MI=200cos.sup.4()[Q(D1/2).sup.2cos.sup.4()+N(D2/2).sup.2cos.sup.4()]/[Q(D1/2).sup.2+N(D2/2).sup.2]; and ME=200cos.sup.4()[Q(D1/2).sup.2cos.sup.4()+P(D2/2).sup.2cos.sup.4(6)+N(D3/2).sup.2cos.sup.4()]/[Q(D1/2).sup.2+P(D2/2).sup.2+N(D3/2).sup.2], where D1, D1, D2, D2, and D3 are in mm, and are the helix angle of each internal and external strand (TI), and are the helix angle of each internal thread (F1, F1), is the helix angle of each intermediate thread (F2) and and are the helix angle of each external thread (F2, F3).

A cord (30) has a triple twist (T1, T2, T3) and comprises an assembly (25) consisting of N=3 strands (20a, 20b, 20c) twisted together with a twist T3 in a direction D2, each strand consisting of M=2 pre-strands, which are themselves twisted together with a twist T2 (T2a, T2b, T2c) in a direction D1 opposite to D2, each pre-strand itself consisting in a yarn that has been previously twisted about itself with a twist T1 in the direction D1, wherein each yarn consists of elementary monofilaments of aromatic polyamide or aromatic copolyamide. Each yarn has a count varying from 90 to 130 tex.

The invention provides a steel cord for rubber reinforcement. The steel cord comprises a core strand and at least three outer strands twisted around the core strand, the core strand comprises at least one first core filament and multiple first outer filaments twisted around the first core filament, each outer strand comprises a number of second filaments, at least one of multiple first outer filaments is preformed prior to being twisted into the core strand, and at least one of second steel filaments is straight prior to being twisted to form each outer strand. The steel cord has improved performance on core filament migration.

A cable as may be used in a tire, including a pneumatic tire. The cable is constructed in a manner that can provide a desired stiffness to a tire as well as a certain amount of structural elongation. The cable can be provided in a manner that does not necessarily result in an increase in the overall weight of the tire as would occur by e.g., increasing the diameter of a conventional cable construction.

A tire includes a steel cord having a plated coating layer, rubber covering the steel cord, the plated coating layer including Cu and Zn, and a bonding layer including Cu.sub.2S and CuS provided closer to the rubber than an interface between the steel cord and the rubber, wherein a molar ratio Cu.sub.2S/CuS of Cu.sub.2S and CuS included in the bonding layer is 1.0 or higher.

A steel cord containing a core layer and an sheath layer, the core layer containing a plurality of core wires with a number of n and the sheath layer comprises a plurality of sheath wires with a number of m, and the steel cord has a flat cross-section with a major axis and a minor axis, the flat cross-section has a flat ratio being the ratio of the length of the major axis and the length of the minor axis, the flat ratio is more than 1.2, the steel cord has a breaking load being BL.sub.cord, the core wires and the sheath wires have a sum breaking load being Sum BL.sub.wires when the core wires and the sheath wires are un-twisted from the steel cord, BL.sub.cord and Sum BL.sub.wires satisfies the following formula: BL.sub.cord/Sum BL.sub.wires >96%. The steel cord has higher breaking load.

A steel cord includes a two-layer stranded construction including a core in which two or three core filaments are twisted, and including a one-layer outer sheath in which outer sheath filaments are helically wound around the core and along a longitudinal direction of the core. The core filaments have same filament diameters as the outer sheath filaments, length of lay for the core is same as length of lay for the outer sheath, and length of lay/filament diameter, which indicates a ratio of length of lay to a filament diameter, is between 50 and 75. Two or more filaments selected from among the core filaments and the outer sheath filaments, are crimped filaments each including bent sections and non-bent sections that are repeatedly disposed along the longitudinal direction.

This disclosure relates to a tire including a spiral cord layer and core-material cord layer arranged between an upper and lower layer of spiral cord layer in a tire crown portion, both the occurrence of groove cracking and occurrence of separation from width-direction end of core-material cord layer can be suppressed. The tire can include carcass which toroidally extends between pair of bead portions; spiral cord layer which is arranged on tire radial-direction outer side of carcass in crown portion and in which an upper and lower layer are formed by spirally winding reinforcing cord; and core-material cord layer which is arranged between upper and lower layer of spiral cord layer. The reinforcing cord of spiral cord layer are composed of carbon fibers, and core-material cords of core-material cord layer have an angle in a range of 0 to 50 with respect to a tire circumferential direction.