A tire includes a carcass ply, a tread disposed radially outward of a crown region of the carcass ply, and a belt structure having an overall axial width substantially equal to a tread width interposed between the tread and the crown region in circumferential surrounding relation to the carcass ply. The belt structure includes a first belt layer and a second belt layer radially adjacent the first belt layer. The first belt layer includes a first reinforced composite with first reinforcement cords embedded in a first rubber matrix. The first reinforcement cords have a construction of 1100/4 dtex with a twist between 150 TPM and 250 TPM and a dipping tension between 100 mN/tex and 200 mN/tex.

The invention relates to a tyre comprising a working reinforcement comprising a single working ply, a carcass reinforcement and a hoop reinforcement. The hooping reinforcing textile filamentary element or elements (480), the working reinforcing filamentary elements (460) and the carcass reinforcing filamentary elements (440) are arranged so as to form a triangular mesh in projection on the circumferential equatorial plane (E). The or each hooping reinforcing textile filamentary element (480) is formed by a cord (30) with a triple twist (T1, T2, T3), comprising an assembly (25) consisting of N>1 strands (20a, 20b, 20c) twisted together with a twist T3 in a direction D2, each strand consisting of M>1 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 at least half of the N times M yarns consist of elementary monofilaments of aromatic polyamide or aromatic copolyamide.

The various embodiments relate to pneumatic tires including a cap ply of braided strands of yarn. Various embodiments relate to strands of yarn that are fiberglass filaments or steel. The braided strands may include a tight braid or a loose braid. Various embodiments include braids having 1 to 5 stitches per cm.

A pneumatic tire having a carcass and a belt reinforcing structure wherein the belt reinforcing structure is a composite belt structure having at least one radially inner spiral layer and at least one zigzag belt reinforcing structure located radially outward of said spiral layer. The zigzag belt width is preferably wider than the spiral layer. The spiral layer and at least one of the zigzag belts reinforcing structures is preferably formed of a merged cord of aramid and nylon.

A pneumatic tire having a carcass and a belt reinforcing structure wherein the belt reinforcing structure is a composite belt structure having at least one radially inner spiral layer and at least one zigzag belt reinforcing structure located radially outward of said spiral layer. The zigzag belt width is preferably wider than the spiral layer. The spiral layer and at least one of the zigzag belts reinforcing structures is preferably formed of a merged cord of aramid and nylon.

The present invention relates to a tire cord and a radial pneumatic tire, and is characterized in that when one raw nylon 6,6 or nylon 6 yarn and one aramid yarn are pre-twisted respectively and are then cabled to generate a raw cord, and when the raw cord is untwisted, the aramid yarn is input 5 to 100 mm/m longer than the nylon 6,6 or nylon 6 yarn. The hybrid dip cord according to the present invention has an excellent fatigue resistance of 80% or more, the initial deformation in the tensile test causes low modulus to be generated by nylon and causes high modulus to be expressed from the section where aramid begins to receive the force. As such, deformation is easy during the work of inflating the green tire inside the mold with the bladder, which makes the manufacturing of tires easy.

Another object of the present invention relates to a method for producing a hybrid dip cord using nylon 6,6 yarn and aramid yarn, in which nylon 6,6 yarn and aramid yarn are pre-twisted by using one selected from the group consisting of a method of controlling the tension applied to the live cord, a method of adjusting the heat treatment temperature, and a method of controlling the heat treatment time, and they are cabled to make a raw cord, then the raw cord is dipped in an adhesive and is then heat-treated to thereby produce a dip cord in which nylon 6,6 has been further shrunk.

Another object of the present invention is to provide a hybrid dip cord for a carcass ply or cap ply layer of a pneumatic radial tire having a certain degree of fatigue resistance, which is produced by dipping the raw cord using the nylon 6,6 and the aramid yarn in a dipping solution and then heat-treating the raw cord so that the nylon 6,6 may further shrink.

In the present invention, twist numbers of aramid yarn and nylon yarn are kept the same during twisting, to thereby allowing a heat treatment process after producing a raw cord, by which the nylon yarn shrinks, and the aramid yarn is set to be longer than the nylon yarn per unit length when the dip cord is untwisted, thereby increasing the fatigue resistance. According to the present invention, it is possible to overcome the disadvantage that it is difficult to deform in a mold with a high modulus when using the aramid alone, and it is possible to improve low fatigue resistance and adhesion which are problematic when using aramid alone, and it is possible to produce high performance tires by improving low modulus and heat resistance that are problematic when using nylon 6,6 alone.

Further, a method of manufacturing a hybrid dip cord according to the present invention includes: a step of preparing one nylon 6,6 yarn or ny

Provided is an organic fiber doubled-and-twisted yarn cord the twist structure of which is uniform and with which it is possible to reduce weight. A doubled-and-twisted yarn cord comprising an organic fiber characterized in that a total fineness is 5000-15000 dtex inclusive, a coefficient of twisted yarn length difference between untwisting yarns constituting the doubled-and-twisted yarn cord that is obtained by an expression: coefficient of twisted yarn length difference (%)=(maximum value of yarn length difference between untwisting yarns)/(average value of yarn length of untwisting yarns)×100 is 1.5% or less, and breaking strength is 7.0 cN/dtex or greater.

A tire includes a tread and a crown reinforcement arranged radially internal to the tread. The crown reinforcement includes a protective reinforcement and a working reinforcement. The protective reinforcement includes a protective ply that exhibits a force at break greater than or equal to 1300 daN.Math.cm.sup.1. The protective ply includes protective reinforcing elements, each of which exhibits a force at break greater than or equal to 3000 N. The working reinforcement is arranged radially internal to the protective reinforcement and includes a working ply. The working ply includes working reinforcing elements, each of which includes a working cord formed of at least a strand that includes an external layer of unsaturated threads.

A radial aircraft tire (1), defined in three main directions, circumferential (X), axial (Y) and radial (Z), comprises a crown (2) surmounted by a tread (3), two sidewalls (4), two beads (5), each sidewall (4) connecting each bead (5) to the crown (2), a carcass reinforcement (7) that is anchored in each of the beads (5) at at least one bead wire (6) and extends in the sidewalls (4) as far as the crown (2), a crown reinforcement or belt (10) that extends in the crown (2) in the circumferential direction (X) and is situated radially between the carcass reinforcement (7) and the tread (3), said carcass reinforcement (7) having at least one ply referred to as carcass ply in the form of a rubber matrix reinforced with radially oriented reinforcing elements, referred to as radial textile reinforcers, the latter being constituted entirely or partially by textile plied yarns of nylon comprising N multifilament strands twisted together to form a helix, characterized in that: N is greater than 2; the count of each strand is greater than 180 tex; the tenacity of each strand is greater than 75 cN/tex; the elongation at break of each strand is greater than 14%; the tenacity of each plied yarn is greater than 60 cN/tex; the elongation at break of each plied yarn is greater than 18%; and the helix angle of each plied yarn is greater than 20.

A hooping reinforcement of a tire for a heavy duty civil engineering type vehicle is disclosed. The crown reinforcement (3) of the tire (1), radially on the inside of a tread (2), comprises a protective reinforcement (6), a working reinforcement (5) and a hooping reinforcement (7). Said hooping reinforcement (7) has an axial width at most equal to the smallest axial width (L61, L62) of the two working layers (61, 62), and comprises at least two hooping layers (71, 72) that are formed from strips each made up of elastic metal reinforcers. Each hooping layer (71, 72) is made up of an axial juxtaposition of contiguous turns of the strip (8), which are circumferentially wound around the working layer (51). Each strip (8) is at least 35 mm and at most 250 mm thick, and its distributed breaking tension is at least equal to 100 daN/mm.