Steel Reinforcement Technology for High-Performance Tires

Steel cord for rubber reinforcement that reduces tip rise of individual steel filaments to prevent issues like rubber ply rise during tire manufacturing. The cord has steel filaments with twist pitches of 6-40 mm and tip rise less than 5 mm after unravelling. This straighter cord minimizes filament damage from straightening machines compared to conventional straightening.

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Pneumatic vehicle tire with belt plies having high tensile strength steel monofilaments to improve tire performance while reducing weight and rolling resistance. The belt plies have reinforcement members made of ultra-high tensile strength steel monofilaments with a diameter of 0.33 to 0.37 mm and a tensile strength of 3080 N/mm2 to 4190 N/mm2. This allows thinner belt plies compared to conventional steel cord belts, which reduces weight and rolling resistance. The ultra-high tensile steel also prevents internal stresses and web undulation issues that can occur with thinner steel cords.

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A metallic reinforcing cord for vehicle tires that provides high adhesion to the tire rubber without needing coatings or treatments. The cord consists of a single helix-shaped metallic wire. The wire is shaped like a helix to maximize adhesion by having a large inner diameter in some cross sections. This prevents shearing forces at the wire-rubber interfaces like in conventional cords with multiple wires. The large inner diameter helps the rubber surround the wire completely. This improves adhesion compared to woven cords where gaps between wires can cause fretting cracks. The single helix wire also allows the cord to be made of a single metallic material, like steel, instead of multiple materials like in woven cords. This simplifies manufacturing compared to coatings or treatments.

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Tire cord steel with high strength and low wire breakage rate for tire reinforcement. The steel composition has optimized levels of carbon, manganese, niobium, vanadium, silicon, phosphorus, sulfur, boron, aluminum, titanium, and nitrogen. Rolling the steel involves a specific heating and cooling sequence to form a targeted microstructure. The steel has improved strength, toughness, and ductility compared to standard tire cord steel. The composition and rolling process reduce wire breakage compared to higher carbon steel while avoiding issues like segregation and brittleness.

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Pneumatic tire that improves durability and running performance of the pneumatic tire by maintaining the turn-up of a steel carcass without a separate member. The tire includes a bead for preventing the pneumatic tire from coming off the rim, an apex configured to absorb an impact applied to the bead, and a carcass extending to surround a portion of the apex and including a steel cord.

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Tire provided with a belt layer capable of improving steering stability performance, ride comfort performance, and the durability performance in a good balance and to provide the belt layer thereof. The tire includes a tread portion and a belt layer disposed in the tread portion, wherein the belt layer includes at least one belt ply, the belt ply includes a plurality of belt cords including a steel single wire having a flat cross-sectional shape, and in at least one of the belt cords, the steel single wire has the short diameter direction inclined at an angle of less than 90 degrees with respect to a thickness direction of the belt ply.

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Pneumatic tire design to prevent reinforcing materials from detaching while still reinforcing the sidewall. The tire has helical steel reinforcing members inside the sidewall protectors. This prevents the protectors from peeling off during contact with road debris. The helical shape allows the sidewall rubber to fully bond with the reinforcer, preventing detachment. An additional elastic reinforcer covered by the helical steel further reinforces the sidewall. This elastic reinforcer has properties matching the sidewall rubber stiffness to prevent peeling. The steel reinforcers are sized to balance strength with weight and rigidity.

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Reinforced product like rubber tires that can be reinforced with sheathed metallic threads for improved strength and durability without using formaldehyde-based adhesives. The sheathing material is a block copolymer with specific structure containing polyamide and polyolefin blocks. The copolymer is applied to the reinforcing threads before embedding them in the rubber composition. This direct adhesion of the reinforcing threads to the rubber eliminates the need for formaldehyde-based adhesives. The sheathed threads are embedded in a rubber composition without crosslinking agents like cobalt salts for adhesion. The reinforced product can be used in tires and other rubber articles. The sheathed threads have a composition with at least 70% of the specific block copolymer.

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Metal reinforcers for rubber composites, like tires, that have improved adhesion to the rubber matrix without using cobalt salts. The metal reinforcer has a partially metallic surface coated with a polybenzoxazine resin. The benzoxazine resin opens at high temperature to form a crosslinked thermosetting phenolic resin that adheres well to the rubber. This provides a durable metal-rubber bond without cobalt salts or brass coatings.

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A simplified tire crown reinforcement design for heavy duty tires like those used in construction equipment. The reinforcement uses level winding of metal strips instead of the typical layered approach with textile reinforcers. The level winding involves zigzagging the metal strip around the tire circumference to create bilayers. This reduces the number of layers needed compared to textile reinforcement. The metal strip level winding allows higher load capacity, better rough terrain performance, and simplified manufacturing compared to textile reinforcement.

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Tire intended for heavy loads that has a rib extending in the tire circumferential direction is formed at the tread. The tire has a carcass having steel cords arranged so as to emanate in radial fashion from a central location at the axis of the tire. Four belt plies having steel cords are laminated at the outside circumference of the carcass.

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Rubber sheet manufacturing process for reinforcement rubber sheets containing steel cords, like tire belts, that enables proper bending and stable placement of the steel cord on the rubber sheet. The process involves winding the steel cord around engagement parts with a specified tension, forming a bending shape in the wound cord, and then placing the bent cord on the rubber sheet while retaining it. This ensures the cord is properly bent with the desired width and shape while keeping tension, which is then transferred to the rubber sheet.

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Radial pneumatic tire for commercial vehicles with improved belt durability and lower weight compared to conventional tires. The tire has a belt assembly with at least three plies - two working plies and an outer protective ply. The protective ply reinforcing members are cords made of twisted steel filaments. The cord construction is optimized to balance strength and weight. Preferred cord constructions are 1x0.35 ST + 5x0.35 ST or 1x0.32 ST + 5x0.32 ST. These cords are arranged at a density of 20-90 ends per decimeter in the protective ply.

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Steel cord for rubber reinforcement in tires that has improved adhesion to the rubber compared to conventional brass-plated steel cords. The cord has a plating layer with a concentration gradient of a third element (like Co, Ni, Cr, Mo, Al, In, or Sn) that is higher near the surface and decreases towards the core. This gradient is achieved through sequential plating followed by two-stage diffusion heating. The gradient provides enhanced adhesion to rubber, especially damp-heat aging adhesion.

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Steel cord for reinforcing tires that provides improved cut resistance while maintaining weight. The cord has a unique twisted structure with a specific ratio of diameters between the sheath filament of the core strand and the outermost sheath filament of the sheath strands. The core strand has a two-layer twist of steel filaments, and the sheath strands have a regular twist around the core. The key is a ratio of 1.25 to 1.50 between the inner core sheath filament diameter and the outer sheath filament diameter. This configuration improves cut resistance of the cord compared to traditional multi-twisted cords while keeping the overall cord diameter and steel usage relatively low.

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Steel cord for reinforcing rubber articles, like tires, that has improved cut resistance. The cord has a layered-twisted structure with a core strand and multiple sheath strands. The key features are: (1) The outermost layer sheath filaments of the core strand have a specific ratio of cross-sectional area to total core filament area (0.69-0.74). This prevents breaks in the core filaments when twisted by the sheath strands. (2) The total sheath strand strength is a specific ratio of the cord strength (0.81-0.85). This reduces the sheath strand tightening force on the core strand. Together, these balance forces to prevent core breaks and improve shear resistance.

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Pneumatic tire design with improved freedom to apply reinforcement materials, particularly in low-profile tires. The tire has a carcass turn-up head structure with a spaced end point for the reinforcement material versus the bead filler. This allows easier application of reinforcement materials like steel bands in low-profile tires without compromising spacing. It improves handling, durability, and ride quality in low-profile tires without adding excess weight or rotational resistance.

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Steel cord for reinforcing rubber articles like tires that has improved strength in both the axial direction and shear direction. The cord has a core strand with twisted filaments and multiple sheath strands twisted around the core. The key innovation is controlling the strength ratio between the core and sheath filaments. The core filament strength is made similar to the sheath filament strength. This allows the core filaments to have superior ductility compared to the sheath filaments. This enhances shear resistance and improves cut resistance by preventing internal wire breakage.

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Steel wire for tires with improved strength and ductility for tire reinforcement applications. The wire has a microstructure that is either fully ferritic, a mixture of ferrite and cementite, or a mixture of ferrite and pearlite. It has low carbon content (C<0.05%) and low chromium content (Cr<12%). This microstructure provides good strength and ductility for tire applications without needing alloying elements. The wire also has a maximum tensile strength that follows a specific formula based on carbon content and wire diameter.

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A metal reinforcer for rubber composites like tires that provides improved adhesion without using cobalt salts. The reinforcer has a polybenzoxazine coating on at least part of its metallic surface. The polybenzoxazine is a thermosetting resin made from a benzoxazine monomer that can open its rings at high temperatures to form a crosslinked polyphenolic structure. The coating improves adhesion between the reinforcer and rubber compared to conventional brass-coated steel.

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