Air Leak Prevention in Tire Design

Sealant composition for self-sealing pneumatic tires that balances sealing performance and flow suppression. The composition has a specific range of toluene insoluble matter content, between 30-60%, to achieve both sealing effectiveness and flow prevention. The insoluble matter content is measured by immersing the sealant in toluene for a week and measuring the mass of the remaining insoluble material. The composition uses a combination of halogenated and non-halogenated butyl rubbers, with a crosslinking agent and organic peroxide, to crosslink the rubber and prevent excessive flow.

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Sealant composition for self-sealing pneumatic tires that balances sealing performance, flow control, and durability. The composition has a measured specific gravity d1 between 0.7 and 0.9, and a calculated specific gravity d2 of 1.0 or less. The compositions are prepared using an underwater displacement method, and contain at least two types of butyl rubber. The measured and calculated specific gravities are used to optimize sealing performance, flow control, and durability of the sealant layer. The specific gravity ratio balances sealing effectiveness with preventing excessive flow while driving. Using two types of butyl rubber with different vulcanization rates creates variations in hardness in the cured sealant that improves sealing performance.

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Graphene is added to rubber compounds, particularly to the inner liner of tires, to improve air retention properties. This reduces permeability and helps maintain tire pressure. The graphene additive provides impermeability beyond what is achieved with traditional halobutyl rubber liners.

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Sealant composition for tires that improves sealing performance, workability, and contamination resistance compared to existing sealants. The composition contains specific amounts of tackifier and plasticizer in the rubber component. The tackifier improves sealing by filling voids and preventing air leakage when a foreign object penetrates the tire. The plasticizer reduces adhesion over time to prevent sticking to the inner liner. The total compounding amount of tackifier and plasticizer is 60 parts by mass or less per 100 parts of rubber. This reduces initial adhesion and viscosity while maintaining sealing effectiveness.

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A resin composition for high-performance tire inner liners that simultaneously improves air permeation resistance and manufacturing processability. The composition includes a base resin of non-hydrogenated or partially hydrogenated petroleum resin and an additive of modified petroleum resin where a molecular weight modifier is attached to improve compatibility with rubber.

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A rotor for vehicle tire pressure control systems that provides a suitable breather of the axle hub and improved oil retention, preventing wear and potential accidents. It has channels and traps in the bearing to guide pressurized air from the axle to the block center where it exits to the exterior, allowing the axle to breathe without oil leakage. It also has an anti-rotation mechanism using a spring-loaded seal to prevent axle rotation.

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Sealant composition for pneumatic tires that provides excellent sealing, rigidity, and reduced rolling resistance compared to conventional sealants. The sealant contains a specific ratio of hydrocarbon resin, liquid plasticizer, and cellulose nanofiber when mixed with the tire rubber. The hydrocarbon resin provides sealing ability, the plasticizer improves flexibility, and the cellulose nanofiber improves adhesion. The sealant composition can be applied to the inner surface of tires to block punctures and seal leaks. Crosslinking agents can be added to further fix the sealant to the tire.

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Pneumatic tires with self-sealing properties to prevent or repair punctures. The tires have a sealant layer and an air barrier layer applied to the cured tire after manufacturing. The sealant layer includes a self-curing butyl rubber composition that can repair punctures. The air barrier layer includes a blend of thermoplastic and elastomeric polymers to reduce air permeation. The layers adhere directly to the tire carcass without an inner liner.

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Building a tire without a separate inner liner, to save costs and weight. Instead of using a separate inner liner rubber, an air barrier material is sprayed on the inner surface of the cured tire after manufacturing. The tire is inflated to shape, then secured and rotated while a spray nozzle applies the air barrier. The spraying can be done using various machines in the tire production process like inflation machines, conveyor sections, or tire trimmers. The sprayed-on air barrier material replaces the inner liner to prevent air loss from the tire.

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Rubber composition for sealants in self-sealing tires that provides good initial sealing performance and resistance to aging deterioration. The composition has a low complex elastic modulus (below 5.00kPa) and contains less than 0.3 parts by mass of oxidizing agent relative to 100 parts of butyl rubber. The low oxidizing agent content prevents accelerated rubber deterioration and sealing failure after aging. The composition can seal punctures in tires and is used in self-sealing tire applications where a sealant is applied to the inner surface to block punctures.

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Pneumatic tire with improved self-sealing performance that maintains sealing ability at high and low temperatures. The tire has an inner liner to maintain air pressure, a sealant layer on the inner surface, and a sound-absorbing material adjacent to the sealant. The sealant layer has two thicknesses - a wider first layer against the liner and a narrower second layer on top. This prevents the sound-absorbing material from degrading the self-sealing ability.

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A self-sealing tire construction and manufacturing method that allows for easy and cost-effective production of puncture-sealing tires with noise reduction. The tire has a foam layer containing a pre-sealant material that breaks down and seals punctures when the tire is vulcanized. The foam layer also reduces road noise. The foam is made by taking advantage of off-gassing during vulcanization that foams the elastomer around the pre-sealant.

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A method of building a tire without an inner liner. The method involves spraying an air barrier material onto the inner surface of the tire after curing. The spraying can be done using automated equipment like an extending nozzle from below the tire. This eliminates the need for a separate inner liner layer and saves cost and weight compared to traditional tires.

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Inflation valve for tubeless tires with stems that have anti-rotation features to improve airflow, allow easy disassembly, and prevent clogging. The valve stem has protrusions that engage slots in the valve body to restrict rotation. This allows the stem to move axially while preventing it from twisting. The valve body has a larger diameter valve seat than the body ID to increase airflow. The valve stem also has components that can be disassembled for cleaning or maintenance.

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Using graphene sheets as an additive in rubber compounds to improve air retention in tires and other rubber products like hoses, seals, gloves, bottles, etc. The graphene reduces the permeability of the rubber, preventing gas or liquid medium from escaping. This helps maintain pressure and prevents the loss of refrigerant gases. By reducing gas permeation in tires, rolling resistance can be reduced. The reduced graphene oxide (rGO) additive provides an ultra-high barrier property to the rubber matrix, making it impermeable.

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Process and system to manufacture high self-sealing tires using an automated, precision process that provides a layer of high molecular organic material on the tire's inner liner. The process includes cleaning the tire, spraying heated self-sealing material on the inner liner, and forced cooling. The cleaning involves soaking, scrubbing, rinsing, rotating, and air drying. The spraying uses an accelerated rotating tire and heated material. The forced cooling uses directed air to rapidly cool the sprayed material.

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Innerliner of a tire that has reduced air permeability by incorporating graphene into the rubber compound. The graphene additive is used in the rubber composition of the inner liner layer of a tire to reduce air permeation which improves tire inflation pressure retention.

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A system for monitoring tire pressure that can accurately detect slow leaks without additional sensors or parameters. The system uses pressure sensors on two tires of an axle and an aggregator that compares the pressure difference between the tires. A noise filter and leak detection module analyzes the aggregated pressure data to determine if a leak is occurring. This allows precise detection of slow leaks that cause a pressure difference between tires.

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A self-inflating tire sealant that prevents slow air leaks and seal punctures without corrosion, damage, or toxicity issues. The sealant contains modified polyurethane resin, polyvinyl alcohol fibers, polyphenylacrylic resin, nano-crystalline cellulose, nano-activated carbon, vinyl acetate, silicic acid gel, antifreeze, antioxidant, surfactant, SBS, isophorone, and solvent. The modified polyurethane resin provides flexibility, weather resistance, heat resistance, and low viscosity. The nanomaterials enhance performance. The sealant can be prepared by a specific method involving controlled heating and stirring.

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Sealant composition for pneumatic tires that balances sealing performance and prevention of sealant flow during tire rotation. The composition contains an organic peroxide and a crosslinking agent, blended with a rubber component containing a chlorinated butyl rubber. The peroxide and crosslinking agent promote sealing by reacting with the rubber. The chlorinated butyl rubber improves reactivity. The blending ratios are from 1-40 parts per 100 parts rubber. This balanced composition ensures sealing while suppressing sealant flow during tire rotation.

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