| Mold Retreading Tires
Staging: This is the starting point. Each tire is inspected in the "staging" area and tagged for retread or repair. Each individual tire is coded with the client's information, assuring that you will always receive your own tire back. The tagging also allows us to follow the tire as it goes through the facility and report to you on where it is in the process and how long it will take to complete.
Initial Inspection: Each tire is carefully inspected by hand. Your casings are thoroughly inspected to ensure they meet our high retreading standards. J & M Tire's certified inspectors look for every cut, puncture, any type of separation as well as other damage to the tire body. Key to this stage is the "hands-on" element of inspection; each tire is felt for bumps and flaws and checked for discolouration and age.
Buffing: Buffing removes the old, worn tread design and removes the oxidized rubber from the casings. The buffer works like a lathe as the tire is buffed, truing your inflated casing with utmost precision. Each tire is carefully measured and remeasured, assuring you a retreaded tire with the exact dimensions and size as if bought new. All removed rubber is sent away to a recycling facility.
Skiving: Skiving, or "cleaning the hole," is the process of removing any injuries caused by rocks, glass, nails etc. The rule of thumb is that an injury will never get smaller, it will only grow bigger. The damaged area is carefully removed with a stone drill that cleans the area, allowing for the proper adhesion and texture of new rubber.
Cementing: The cementing process provides a tacking surface for the new rubber and prevents oxidation of the casing.
Plugging/Filling: The objective of plugging is to provide a uniform surface with which to apply a retread on the buffed surface. The smoothing of any deformities and crevices is done with only 100% natural rubber, which supplies extra tackiness and durability to the area.
Builder: The Marongoni builder is a computerized machine. A mixture of 70% natural rubber and 30% synthetic rubber is placed in an extruder, where it is processed. The casing is placed on a builder at the far end of the conveyor. The tire's dimensions are programmed into the computer and the calendar lays the rubber onto the rotating casing at the proper dimensions. This system consistently insures that your tires are retreaded to precise radius, diameter and tread depth specifications.
Mold: The tire is then brought over to the matrix. Once inside the matrix, the tire is inflated to 180psi and the new tread design is embedded into the tire using a metal mold on the inside of the matrix that is heated to 270 degrees Fahrenheit. The tire is cured from the outside in. Once removed, the tire is cooled in a relaxed position.
Triming & painting: Any excess rubber is removed to create a clean, smooth finish and the tire is given a fresh coat of paint.
Final Inspection: Upon completion of the retreading process, each tire undergoes a final inspection, as rigorous as the initial inspection. Before an inspector will give a tire the stamp of approval, he looks for any safety related defects and ensures that all repairs were completed correctly and that the tire has a new look and appearance. Only a first class retreaded tire will be shipped back to a customer.
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