Tire Retreading Technology for Extended Lifespan

Retreading tires without using a curing chamber by facilitating adhesive curing using moisture. The method involves applying a primer to the tire casing and tread, then an adhesive over the primer. A moisture reservoir is coupled to the tread near the bondline. Enclosing the tread, casing, and reservoir in an envelope and vacuuming out the air to apply pressure. This facilitates curing of the moisture-curing adhesive using the moisture reservoir instead of a curing chamber.

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Retreading is a cornerstone in the remanufacturing process of tires, facilitating extraction maximum kilometers (Km) from tire carcass. Tire plays crucial role conserving raw materials, reducing environmental impacts, and lowering overall operating costs. This study employs predictive modeling techniques to forecast performance optimize resource allocation, departing traditional approaches, for bus transport system India. Machine learning models, including linear regression, ensemble boosted trees, neural network were used. Two scenarios devised: Scenario I addressed premature failures optimizing reduce procurement II used targeted interventions, such as eliminating new condemnations retread (RT) strategies, could potentially salvage 169 tires retirement. The results achieved R2 values 0.44, 0.51, 0.45 improved test datasets 0.46, 0.52 0.44. By leveraging these decision-makers can substantially improve mileage, condemnations, increase production, drive cost savings fleet operations. Notably, this approach contributes enhanced operational efficiency promotes sustainability by cutting ... Read More

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Accurately determining whether a worn tire can be retreaded by separately evaluating chemical and physical degradation. The method involves acquiring state characteristic values indicating the tire condition, then making a first determination using the base tire's remaining durability based on rubber degradation. If retreadable, a second determination is made using the base tire's remaining durability based on physical damage. This two-step process allows more accurate assessment of tire condition for retreading by separately evaluating chemical and physical degradation.

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Retread tire with improved durability to prevent separation of the recapped tread from the base tire. The retread has a recapped tread with dimples on the inside edge that extends into the tread. The dimples have a maximum diameter of 2-5 mm and depth of 1-3 mm. These dimples help prevent separation by absorbing and dissipating heat generated during driving, reducing the risk of the tread separating from the base tire.

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Reducing waste and improving splicing consistency in retreading tires by optimizing the length of preformed tread segments. The segments are cut from a mold with specialized end segments that have shorter length compared to the main segments. This reduces the amount of tread that needs to be removed from the ends during retreading to provide a suitable splice face. It eliminates waste from excess material that would be cut off during splicing.

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Retreaded tire with improved resistance to tread peeling off the base tire, especially at the shoulder regions. The retreaded tire has a tread rubber with a shoulder circumferential groove adjacent to the tread edge. This groove has a surface with multiple dimples. The dimples reduce heat buildup in the shoulder area during driving, preventing peeling. The tread also has narrow shoulder lateral grooves opening on the ground contacting surface and buttress surface. This configuration further reduces heat generation and peeling at the shoulder.

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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.

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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.

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Method for retreading tires using pre-vulcanized composite treads to reduce energy consumption and cost compared to traditional hot retreading. The method involves washing and inspecting the tire carcass, repairing any damage, then bonding a pre-vulcanized composite tread directly to the carcass using cold adhesive. The composite tread has layers like crown, transition, wing, and bottom. The pre-vulcanized tread is made by extruding or calendering the layers at temperatures below 100°C. This allows the tread to be attached at room temperature rather than vulcanizing the entire tire.

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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.

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Retreading method for waste solid tires that improves efficiency, utilization rate, and performance of retreaded tires. The method involves classifying waste solid tires based on damage levels before retreading. This allows shorter retreading times for less damaged tires versus longer times for severely worn tires. During retreading, carbon fiber powder is added to the tire core bonding process to enhance strength and rigidity of the retreaded tire.

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Cold retreading method for tires that allows high productivity and safety compared to traditional cold retreading without using autoclaves or envelopes. The method involves using cushioning pads with specific composition during the curing step. The cushion pads contain conductive materials like graphite, graphene, or carbon black. These pads are connected to a heat or power source during curing to provide radial pressure on the tire instead of using autoclaves. This eliminates the need for internal pressures, complex envelopes, and autoclave safety.

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Retreading tires at lower temperatures by priming the rubber surfaces with a treatment composition before adhering them with a urethane adhesive. The treatment composition contains a halogenating agent and solvent like water or alcohol. Applying multiple coating layers of the treatment enhances adhesion when cured. The primed rubber components are then sandwiched together with the urethane adhesive at lower temperatures for retreading. The low-temperature curing is enabled by the priming process.

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Retreading heavy duty tires with improved quality and longevity by inflating the diaphragm inside the tire to 15 bar before retreading. This eliminates air pockets between the diaphragm and tire inner surface that can deform the diaphragm during retreading and cause premature failure. The inflated diaphragm provides consistent pressure for optimal vulcanization of patches and uniform thickness of the retreaded tire.

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Truck tire design optimized for retreading to maintain performance and durability when the original tread wears out. The tire has a specific tread pattern for the drive wheels of a truck tractor that can be retreaded without compromising safety or longevity. The tire also has reinforcing belts with cables oriented at a specific angle to the tire circumference. This optimized tread and belt construction allows retreading while preserving the functional and structural cooperation between the tread and tire casing.

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Retreading tires without a curing chamber to enable tire retreading in remote locations. The method involves applying a primer to the inner surface of the tread and outer surface of the tire carcass, then applying an adhesive to the primed surfaces. The tread is attached to the carcass, and a moisture reservoir is placed around the tread. The assembly is enclosed in an envelope and left to cure at room temperature using the moisture in the reservoir. This allows retreading without a curing chamber or furnace.

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Retreading method for tires to improve wear resistance and extend tire life when retreading worn tires. The method involves using a reinforced resin glue with carbon nanotubes, tannic acid, and an organic silane coupling agent. The carbon nanotubes improve hardness and wear resistance. The reinforced resin glue is applied to retread the tire. The specific composition of the reinforced resin glue is: epoxy resin, white carbon black, neoprene, vulcanizing agent, and vulcanization accelerator. The carbon nanotubes make up 1.8-2.6% of the reinforced resin glue. The carbon nanotubes are dispersed in ethanol along with tannic acid and the silane coupling agent in a ratio of 15:3-4:1.

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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

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Cold retreading method for tires that allows faster and safer retreading compared to existing methods. The method involves using a conductive adhesive compound between the retread strip, cushion, and casing during curing. The compound contains 5-20% conductive material like graphene, graphite, or high surface area carbon black. This compound is connected to a heat source or power source during curing to transmit heat to the cushion. This eliminates the need for envelopes and autoclaves to compress the retread strip during curing, improving productivity and safety compared to existing cold retreading methods.

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Retreading a tire in order to extend the life of tires. The retreading process involves providing a tire casing, providing a cured rubber component having first and second planar surfaces, where the first planar surface includes a tread pattern, providing a cushion gum, wherein the cushion gum is a composition including a functional polymer including at least one functional group, and a crosslinking agent including at least two moieties that will react with the functional group of the functional elastomer.

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Method for manufacturing retread tires that allows reuse of worn tires with uneven treads. The method involves forming an adhesive layer on the worn tire's outer surface before attaching the new tread. The adhesive layer is applied by sequentially placing small adhesive elements on the tire surface. This ensures the adhesive coverage matches the uneven worn surface. The tire is then rotated while attaching the new tread, pressing it against the base tire with a roller. This ensures full contact between the new tread and base tire, even with the uneven worn surface. After attaching, the tire is irradiated with an electron beam to cure the adhesive. This joins the base tire and retread securely, promoting retread longevity.

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Retreading large mining tires to extend their life and reduce replacement costs in harsh environments. The method involves carefully repairing and reinforcing damaged areas of the tire carcass without replacing the entire tire. It involves cleaning the damaged area, applying a bonding agent, laying down a reinforcement patch, and curing the patch in place. This allows repairing punctures and cuts without compromising tire integrity and extends the life of the tire. The retreading is done in multiple layers to build up thickness and durability over time.

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Pre-vulcanized annular crown for super giant tires that can be retreaded more often and with better performance compared to traditional retreading methods. The crown is made separately and then attached to the carcass before final vulcanization. This allows reusing more old carcasses since the crown can be retreaded independently. The pre-vulcanized crown improves puncture resistance and wear compared to retreading just the tread.

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Pre-vulcanized annular crown for extra-jumbo tires that allows higher recycling of used tire carcasses compared to existing retreading methods. The crown is manufactured separately and has a ring shape. This allows using carcasses with damaged belt steel wires and tread areas that can't be retreaded with the current techniques. By peeling off the damaged parts and grinding the carcass to a ring shape, it can be retreaded by matching and attaching a new ring-shaped crown. This enables recycling carcasses with localized damage that can't be refurbished using traditional methods.

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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.

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Retreaded tire design with a scraper mechanism to improve wear resistance and cleaning of the inner liner. The tire has a scraper attached to the wheel hub that extends into the tire cavity. The scraper has a hinged connection to the hub and a rotatable connection to the wheel. It can be raised and lowered to scrape the inner liner and remove debris. A waterproof spring keeps the scraper extended during driving. This prevents debris buildup on the inner liner that can cause punctures. The scraper also helps clean the inner liner during rotation, extending the life of the retread.

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Method for retreading tires that improves the quality and durability of retreaded tires compared to traditional methods. The method involves detecting and removing nails from the tire, grinding the tire surface to smooth out punctures, applying adhesive, and layering the middle cushion rubber in a specific sequence. This involves applying 2-3 layers of rubber on areas without cord fabric, then 1 layer on the corded area. This allows thicker rubber in non-corded areas for better traction while still fitting over the cord fabric.

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A multi-function station for retreading tires that can efficiently apply the tread, remove air, and fill the cavity between the tread and casing in one machine. The station has a central rotating column with an expandable hub to hold the retreaded tire. Lateral assemblies on each side perform tasks. One side stretches and applies the tread. The other side removes trapped air. The station synchronizes movements to center the tread, stretch it, and apply it precisely. This integrated approach reduces time and labor compared to separate machines.

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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.

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Retreading tires with optimized tread usage and depth by using a pre-tread strip with a smooth rear face and tread grooves on the front. The strip is glued to the tire casing with the smooth side facing in. This allows the tread grooves to align with the existing casing grooves. The retreaded tire is then cured under pressure to bond the tread and casing. The initial tread groove depth is greater than the casing groove depth. This provides deeper tread grooves compared to a regular retread, improving tread life and performance.

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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.

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Cold retreading method for truck tires that avoids the use of autoclaves and envelopes for compressing the retread against the casing during curing. Instead, a radial pressure is applied directly to the retread using a pneumatic bladder system. The tire is mounted on a curing drum with the retread facing outward. A pneumatic bladder is positioned between the drum and the retread. During curing, the bladder is inflated to compress the retread against the drum and casing. This provides the necessary radial pressure without envelopes or autoclaves.

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Method for retreading waste solid tires to improve the quality and durability of the retreaded tires. The method involves grinding the worn outer tread and sidewalls of the waste solid tire to create a more even thickness before molding the new tread. This corrects the deformations caused by wear during tire life, allowing the retread to better adhere to the underlying carcass. The retreaded tire has improved performance and longevity compared to retreading uncorrected worn tires.

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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.

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Method to repair localized wear or damage in tire treads by removing the damaged material, creating a specific shape, applying an adhesive, and inserting a replacement element. This prevents propagation of wear or damage beyond the initial affected area. The replacement shape matches the original tread feature to maintain overall tread profile and performance.

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Retreading tires with improved performance and reduced rubber waste. The retreading method involves creating specific groove patterns on the base rubber of the tire before bonding the new tread. The base groove is opened to the prepared bonding surface. The new tread has primary and secondary grooves with different openings. The secondary groove's top is higher than the primary groove's bottom. This sequence ensures the secondary groove's top wears away first, exposing the base groove. It provides a continuous wear surface without gaps. The retreaded tire has open grooves on the front and closed grooves on the rear, preventing voids as the tread wears.

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Retreading tires by applying pressure to the bonding layer between the tread and casing during wrapping to improve adhesion and prevent delamination. The technique involves wrapping the casing with a strip of material, inflating the casing before wrapping to provide tension, and then heating and cooling the strip to bond the tread. This provides more uniform pressure and adhesion compared to conventional retreading.

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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.

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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.

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A cost-effective and durable method for retreading construction machinery tires to extend tire life and reduce costs. The method involves bonding together two old tires, one larger and one smaller, to create a thicker and stronger retreaded tire. The smaller tire is ground and polished to create a rough outer surface. The larger tire's tread and inner surface are ground and polished. Both tires are glued together, cushioned, and vulcanized to create the retreaded tire. The cushioning between the tires prevents inner tire deformation and provides stress support. The retreaded tire has increased load capacity and durability compared to a single retreaded tire.

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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.

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Automated tire regeneration process that allows for reliable and efficient regeneration of worn tires by automating the process of attaching a new tread to the buried original tread. The process involves feeding a shorter length tread onto the buried tire, extending it to match the tire circumference, and securing both ends. This prevents overlapping or gaps at the ends. The length adjustment is done using a mechanism that stretches the tread while pressing it against the tire surface. The system measures the original tire circumference and compares it to the tread length to ensure an exact match.

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Rubber composition for tire case rubber that reduces cracking in retreaded tires. The composition has a specific particle size distribution and zinc salt of fatty acid content. It has a low amount of large aggregates (>29 µm) compared to smaller aggregates (3-57 µm). The composition also contains 2-13 parts zinc salt of fatty acid per 100 parts rubber. This reduces aggregates that can initiate cracks. The composition can be used in tire case rubber to improve retreaded tire durability.

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Process for making chopped carbon fiber reinforced engineering retread tire tread rubber that improves puncture resistance, abrasion resistance, and chipping resistance of retreaded construction machinery tires. The process involves treating the chopped carbon fiber with a specific solvent and rubber coating to improve bonding between the fiber and tread rubber matrix. This enhances composite strength, reduces fiber displacement, and prevents damage during mixing. The treated carbon fiber is then added to the tread rubber compound for retreading construction machinery tires.

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Retreading method for large construction machinery tires that involves grinding the worn tire carcass to a specific thickness, applying adhesive, and then winding a new tread compound onto the carcass using a specialized mold. The retreaded tire is then cured under specific temperature and pressure conditions. This allows extending the life of large construction tire treads by replacing the worn outer rubber instead of the entire tire. The retreaded tire has improved wear resistance compared to a new tire due to the deeper pattern remaining on the carcass.

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Rehabilitated tire with improved vulcanization uniformity and reduced peeling between the tread rubber and base tire when reusing old tires. It uses a heat conductive layer between the base tire and the center of the rehabilitated tread. The layer is made of a wire coated in rubber with specific properties. It has a width within the belt width range, wire ratio of 0.05-0.85, inclination angle of 50-70 degrees, and a peeling force of 120N/25mm. This prevents heat concentration in the center tread area, reducing insufficient vulcanization. The center tread volume is 0.10-0.85 of the shoulder volume. The coated rubber is hardness 68-78 and 5-8 MPa tensile stress.

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Retreaded tire design that prevents tread separation and buckling when reusing old tires. The design involves arranging the tread rubber end at a step in the tire sidewall that was buffed during the original tire manufacturing. This step location is outside the tire width, with the tread end positioned beyond it. This prevents tread separation by anchoring the tread end in the buffed area, and prevents buckling by avoiding excess tread overfilling the mold. The step location is also angled back from the tire axis. This prevents deleting tire branding or shortening sidewall thickness.

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Cold retreading method for truck tires that eliminates the need for autoclaves and envelopes used in hot retreading. In cold retreading, a new tread strip is applied to a used tire casing without removing the old tread. The tread strip is vulcanized in place against the casing using radial compression forces. To achieve this, the tire is placed in a chamber with a vacuum inside and an external overpressure applied. The vacuum inside the chamber pulls the tread against the casing while the external pressure compresses it further. This allows vulcanization without the need for autoclaves or envelopes that have drawbacks like safety concerns, short lifespan, and failure issues.

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Retreading process for used tires that involves inspecting, cleaning, shaping, vulcanizing, and re-treading the tire carcass. The process aims to extend tire life by refurbishing worn tires instead of discarding them. The steps include: (1) inspecting, cleaning, and drying the old tire to select suitable candidates for refurbishment, (2) cutting and grinding the carcass to remove aged rubber, (3) inflating and shaping the carcass in a vulcanization tank, (4) vulcanizing the carcass with inner tube pressure and outer envelope inflation, (5) attaching pre-vulcanized tread strips, and (6) secondary vulcanization at lower pressure to bond the carcass, liner, and tread. This process allows efficient retreading of used tires without high costs or quality issues compared to conventional methods

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Regenerated tire forming apparatus for efficiently and accurately molding a regenerated tire from a worn tire. The apparatus has a device to fix and rotate the worn tire, and a separate tread transfer body to convey, cut, and adhere a new tread section. This allows precise transfer and bonding of the new tread to the worn tire. The tread transfer body can wind, unroll, and flatten the tread for uniform adhesion. The tire rotates during bonding to prevent warping. The tread transfer body also has features like guides, rollers, and presses to prevent tread curl, bending, or misalignment. This ensures consistent tread adhesion and prevents defects.

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