Retreaded, or "recapped," tires for trucks are made by a process that starts with used tire casings. The worn tread is removed from the casing, and the casing is inspected for any damage or defects. If the casing passes inspection, it is cleaned and then a new layer of tread is applied to the tire using a specialized process.
The most common process used to retread truck tires is called the "Bonded Process." In this process, a new tread is constructed using a rubber compound that is molded to the shape of the tire. This molded tread is then placed on the tire casing and bonded to it using high-pressure steam and pressure-sensitive adhesives.
Another common process used to retread truck tires is called the "Mold Cure Process." In this process, the new tread is molded onto the tire casing while it is in a heated mold. The molding process takes place under controlled temperature and pressure conditions, and the tire is allowed to cool and cure in the mold before it is removed.
Retreaded tires must meet stringent safety and performance standards before they can be sold, and they are required to undergo rigorous testing to ensure that they meet these standards.
In summary, retreaded truck tires are made by removing the worn tread from a used tire casing, inspecting the casing for defects, cleaning the casing, and then applying a new layer of tread using a specialized process such as the Bonded Process or the Mold Cure Process.