Tire Retreading Technology for Extended Rubber Tire Lifespan

Retread tire with improved resistance to separation of the recapped tread from the base tire, especially at high temperatures during driving. The retread has a recapped tread with a buttress surface extending inward from the tread edge. This buttress surface has a pattern of dimples with specific size and depth ranges. The dimples help prevent separation by dissipating heat and reducing stress concentration at the tread-base interface.

Source

Method for manufacturing retread tires using an automated molding process to improve quality, reduce costs, and enable customization compared to manual retreading. The process involves preparing a buffed tire, designing the tread extrusion shape based on the buffed tire profile, mapping it, calculating the required rubber amount, mounting the buffed tire in a rotating fixture, attaching the calculated rubber strip using an applicator calendar, inserting and molding in the curing mold, then removing the retreaded tire.

Source

Method for retreading large tires that extends the life of tires by selectively repairing and reusing them instead of replacing them when worn. The method involves a multi-step process to inspect, mill, repair, polish, vulcanize, and test the tires. It starts with an initial inspection to determine if the tire can be retreaded based on factors like exposed wire, damage beyond manufacturer limits, or contamination. If the tire passes, it's milled to expose the carcass, repaired, polished, vulcanized with a new tread, and inspected again. This allows selective retreading of tires that still have good carcasses instead of premature scrapping.

Source

Production process for retreading all-steel radial tires that improves retread durability and reduces failures compared to traditional retread methods. The process involves attaching a new annular tread segment to the worn tire carcass using a unique technique. The steps are: 1. Clean and prepare the worn tire. 2. Cut a new annular tread segment from natural rubber with super wear-resistant furnace black reinforcement. 3. Apply an antioxidant to the tread segment. 4. Attach the tread segment to the tire using a special adhesive film lamination process. 5. Cut the film at the ends to create a clean, angled joint between the old and new rubber. 6. Cure the retread tire to bond the new tread segment securely. This process provides a more consistent retread shape, reduces joint failures, and impro

Source

A process for retreading tires that involves selectively removing damaged sections from the old tire instead of replacing the entire tread. The process involves visually inspecting the tire for areas like the crown, shoulder, and inner sidewall that have delaminating, cracking, deformation, or breaking. Only those sections with significant damage are removed. The remaining intact sections are reused as the new tread. This targeted selective retreading avoids the need for full tire replacement or expensive re-embossing/forming methods.

Source

Tread support device for improving quality of tire retreading by minimizing tread movement during brushing. The device has a circular arrangement of rollers that support the tire tread as it passes through. This limits tread deformation and irregularities caused by differences in rigidity. The rollers provide better support and prevent tread blocks from bending and moving excessively when brushed, resulting in more uniform and desirable brushing of the tire underside.

Source

A method for retreading tires that involves cleaning and inspecting the old tire, applying an adhesive layer, curing it, and then mounting a new tread. The key differences from conventional retreading methods are: 1. Lower inflation pressure (around 4 kgf/cm2) during cleaning and inspection to reduce the risk of damaging the tire carcass. 2. Applying the adhesive layer at a lower pressure (around 4.2 kgf/cm2) to better adhere to the tire. 3. Curing the adhesive layer at lower temperatures and pressures compared to conventional methods. This reduces energy consumption and environmental pollution.

Source

Retreading tires with improved joint adhesion and reduced cracking. The method involves bias cutting the tread at an angle instead of vertical butt joints. The tread is cut at a 30 degree incline parallel to the tire axis. This creates a wedge shape joint section when joined end-to-end. The wedge shape increases the adhesion area compared to vertical joints. The wedges can have matching bulges and grooves. This prevents cracking by spreading the force across the wider joint area. The retreaded tire has a parallelogram shape when unfolded.

Source

Method to produce retreaded tires with desired tread patterns and improved performance. The method involves pre-curing the tread band separately before attaching it to the base tire. This allows better control over the tread shape compared to directly molding the tread onto the base. The pre-cured tread has a pattern and connectors for attaching to the base. The connectors have needles to secure the tread ends during vulcanization. The pre-cured tread is also filled to cover the join. This prevents voids in the tread during vulcanization. The pre-cured tread is attached to the base and vulcanized to complete the retread.

Source

Retreading tires with improved wear and reduced material usage by forming the retreads with a flat back surface instead of a curved one. The retreading process involves vulcanizing the retread onto the tire carcass under pressure to conform the back of the retread grooves to the carcass shape. This eliminates the need for the retread grooves to match the curved carcass profile. It allows using thinner retread rubber while maintaining wear volume by avoiding excess material in the grooves.

Source

Retread tire with improved durability at the interface between the retread rubber and base tire to enable more retreading cycles without peeling or delamination. The tire has a specific sulfur content (0.85-4% by mass) in the retread rubber layer and a sulfur difference (25-75% by mass) between the retread and base tire isoprene rubber contents. This suppresses deterioration and excessive curing of the base tire. The retread tire also contains a vulcanization accelerator derived from xanthogenic acid, thiuram, or thiocarbamoyl dithio compounds.

Source

Retread tire design to prevent buckling when remolding used tires. The tire has specific dimensions and ratios to minimize buckling during remolding. The tread profile shape, tread rubber thickness, and cross-section height are optimized to reduce the likelihood of buckling. The tread width decreases rapidly from the shoulder to the center, but not excessively. The tread rubber thickness at 75% of the height is in a narrow range. The cross-section height is between 60-90% of the maximum width. Drawing lines parallel to the tread end connect at specific distances from the tire edge.

Source

Retreaded tire with improved durability and resistance to separation and blowout. The retreaded tire uses a specific cushion rubber made with a rubber composition containing 60-100% natural rubber/synthetic polyisoprene, 30-50 parts highly reinforcing carbon black, and a 3.0-6.0 MPa 100% modulus. This cushion rubber layer sandwiched between the base tire and precured tread prevents separation and blowout. The base tire and precured tread have 60%+ natural rubber/syiprene. The lower modulus cushion matches the base tire stiffness for better adhesion.

Source

Retreading tires with embedded belt edge cover layers to prevent damage to the covers during buffing while ensuring sufficient new tread rubber volume after retreading for durability. The retreading process involves selectively grinding convex protrusions on the base tire's tread surface away from the edge cover ends. These protrusions overlap the edge covers. This avoids accidental shaving of the covers during buffing while still allowing enough tread rubber under the grooves for durability.

Source

A method for recapping tires that involves sulfurization of old tires to improve their performance and extend their life. The method involves specific pressure, time, and temperature parameters for sulfurization that result in better quality retreads. The tire pressure during sulfurization is lower than normal, which allows better cure efficiency. The lower tire pressure helps prevent blistering and separation of the retread. The optimal pressure, time, and temperature for sulfurization can be adjusted based on tire thickness and manufacturer.

Source

A method to retread tires using pre-vulcanized annular treads that avoids high-temperature vulcanization to protect the tire carcass. The method involves forming a continuous annular, jointless annular tread by pre-vulcanization. This pre-vulcanized annular tread is then adhered to the outer circumference of the tire using a special adhesive. This eliminates the need for high-temperature vulcanization after retreading, as the annular tread is already cured. This protects the tire carcass, reduces retreading time, and saves energy compared to conventional retreading methods.

Source

Retread tire with improved wear resistance and reduced rolling resistance by optimizing the cushion rubber between the base tire and retread. The cushion rubber has varying thickness and dynamic properties like elastic modulus and loss tangent in the tire width direction. This allows adjusting wear and heat generation. Thicker cushion on the shoulder reduces wear there while thinner cushion on the center improves durability. Different dynamic properties further optimize wear and heat.

Source

A manufacturing process for retreading tires that reduces failures and improves accuracy without increasing cost. The process involves detecting the end position of the cushion rubber in the tire width direction after attaching it to the base tire. This position is then used to move the precure tread before application so its center matches the cushion center. This avoids misalignment issues that can occur with automated winding. A laser sensor detects the end of the cushion when viewed in cross section.

Source

Retreading tires using a precured tread with improved durability and simplified manufacturing. The precured tread has a cord structure with wavy cords that allows expansion during bonding to the base tire. This allows the precured tread to be expanded sufficiently for bonding without using special equipment. The wavy cords on the inner periphery of the tread deform during expansion, matching the diameter of the base tire. This prevents wrinkling and delamination issues when bonding a flat precured tread onto a curved base tire. The wavy cord structure provides reinforcement without requiring a separate belt layer.

Source

Precure tread for retreading tires that allows more design flexibility and improved durability compared to conventional precure treads. The precure tread has multiple rubber layers with circumferential grooves on the contact surface and adjacent layer. The grooves extend along the tire circumference. This allows designing the tread pattern without restriction on the back surface groove shape. It also provides a more gradual curvature radius on the back groove bottom compared to conventional single layer precure treads, reducing the risk of cracks in the groove walls.

Source