Disclosed are a hybrid cord produced by plying and twisting high modulus yarns and polyamide monofilaments, and a tire including the same. More specifically, disclosed is a method of producing a hybrid cord having a clear core-covering structure including a core comprising a polyamide monofilament and a covering spirally twisted around the core and comprising a high modulus yarn. The hybrid cord can clearly control the modulus ratio in each area, improving production efficiency of the cord and processability of the tire and reducing deviations of uniformity and driving performance. In addition, the tire using the hybrid cord reduces tire deformation during driving, thus satisfying both driving performance and comfort.

Provided is a tire that is lightweight and excellent in riding characteristics while suppressing an increase in cost.

A plurality of belt layers 7 are superimposed in a radial direction. The belt layers 7 include a plurality of steel cords 10 arranged in parallel in a row and rubber 11. The steel cords 10 have a 14 structure in which four filaments 20 are twisted, and when a center-to-center distance between the steel cords 10 in at least two of the belt layers 7 adjacent in the radial direction is T, and an average diameter of virtual circumscribed circles of the steel cords 10 having the 14 structure is D, 1.25T/D2.25.

A reinforced product, which can be used in particular for the reinforcing of a finished rubber article, comprises one or more textile or metallic reinforcing threads, the said thread or threads being covered individually or collectively with a sheath comprising a sheathing composition comprising one or more block copolymers comprising at least one polyamide block and at least one polyolefin block, the sheathed thread or threads being themselves embedded in a rubber composition.

Provided is an elastomer reinforcement cord with improved rust resistance. An elastomer reinforcement cord 10 includes metal filaments and a polymer material. The elastomer reinforcement cord 10 has a multi-strand structure which includes: at least one core strand 21 formed by twisting plural metal filaments 1a and 1b together; and two or more sheath strands 22 each formed by twisting plural metal filaments 11a and 11b together, the sheath strands being twisted together around the core strand. An intra-sheath-strand filling rate a, which is a ratio of the area of the polymer material with respect to an intra-sheath-strand gap region A, is 52% or higher, and an inter-strand filling rate b, which is a ratio of the area of the polymer material with respect to an inter-strand gap region B, is 75% or higher.

A method for manufacturing a straight steel monofilament for the reinforcement of belt ply of a pneumatic tyre, where the arc-height of the straight steel monofilament is less than 30 mm. The steel monofilament is plastically deformed by a twisting along the axis of the steel monofilament on a double-twist apparatus. The plastic twist deformation eliminates the surface stress difference on the steel monofilament and provides a straight steel monofilament for belt ply reinforcement. This provides a simple solution with existing apparatus to manufacture straight steel monofilament suitable for tire reinforcement with high speed for mass production.

The present invention relates to a cap ply reinforcement hybrid yarn (1) which is located between the tread and the belt package especially in radial passenger vehicle tires, which improves the high speed durability of the tire by using polyamide (N)/polyester (P) yarns, and which provides fuel saving by decreasing the rolling resistance.

At a pneumatic tire (11), in a pneumatic tire in which a reinforcing layer (11) is structured from at least one reinforcing ply (53) in which are embedded plural reinforcing cords (54) that are formed from steel and are inclined with respect to a tire equator S, an inclination angle A of the reinforcing cords (54) with respect to the tire equator S is within a range of 40 to 90, and a compressive rigidity F per 50 mm width of a reinforcing layer (52) in a direction parallel to the reinforcing cords (54) is within a range of 1000 to 2400 N.

In a tire 2, a band 16 has a jointless structure. A reinforcing layer 18 is layered over the band 16 from a radially outer side of the band 16. In the reinforcing layer 18, a reinforcing cord 40 is extended alternately on and between one end 32 portion of the band 16 and the other end 32 portion of the band 16, so as to extend in the circumferential direction. A direction in which the reinforcing cord 40 extends is tilted relative to the circumferential direction between one of ends 32 of the band 16 and the other of the ends 32 of the band 16. An absolute value of an angle of the reinforcing cord 40 relative to the circumferential direction is greater than or equal to 70.

A pneumatic tire having a carcass and a belt reinforcing structure, the belt reinforcing structure comprising: a zigzag belt reinforcing structure formed of a strip of one or more reinforcement cords, the strip of one or more reinforcement cords being inclined at 5 to 30 degrees relative to the centerplane of the tire extending in alternation to turnaround points at each lateral edge, wherein the zigzag strip of cords may be formed from two different reinforcement cords made of different materials, and the lateral edges of the strip are preferably pointed or triangular in shape.

A cord-rubber composite 11 comprises a cord array 12 of parallel steel cords 14, and an unvulcanized topping rubber 13 coating the cord array 12 and having a complex elastic modulus E* of not less than 5 MPa after vulcanization. The code array has a surface area parameter S (mm) of not less than 60 mm. The surface area parameter s (mm) is defined by the following expression: S=DPiE, wherein E is a cord count of the steel cords 14 per 5 cm width of the cord-rubber composite 11 in a direction orthogonal to longitudinal directions of the steel cords, and D is an average outer diameter (mm) of the steel cords per the 5 cm width.