Hot retreading is the term used to describe the retreading process in which the curing of retread is done at a temperature of above 130c. It employs a steel or aluminum mold with a tread design cast or machined into it.
This system is similar to the technology of new tyre manufacturing.
Uncured runner is applied to tires in which the design will be molded into place during cure. Uncured rubber can be applied by strip winding extruders or slab extruders which provide the correct width and thickness to fill the tread design in a mold.
Rubber can also be purchased in a specified shape to apply around a tire for mould cure. This is called die size or camelback rubber.