The Bandag Process
The Bandag Retreading Process
The Initial Inspection
There are basically three steps involved in the intial inspection process to determine if your tire can be retreaded.
First, a visual, hands-on inspection from bead to bead, inside and out, is done to find and mark all visual defects.
After the visual inspection, and electronic inspection is performed, which is designed to find all "through-the-tire" penetrations in the crown and sidewall areas of the tire.
Finally, your casing is place on the shearographer to determine the condition within the casing.
The shearographer uses a vacuum to find anamolies in the tire, while lasers measure any surface anomalies. It created an animated visual of the casing, and helps aid with finding any problems with the casing.
At the end of the initial inspections, information like casing condition, casing age, and fleet specifications are considered while determining if your tire can be retreaded.
Preparing Your Tire for New Tread
Once the initial inspection has been completed and your tire has been approved for retreading, the process for preparing your tire for retreading begins.
Your casing is first inflated to the proper operational pressure, then placed on the buffer. The buffer actually removes the worn tread surface, trues up the roundness, and prepares the surface of the tire for new tread.
After the buffer has corrected any problems, then the repair process on your tire begins. Any and all injuries found during the initial inspection process are repaired, replacing the damaged material with structurally sound materials, returning the casing to a useful state.
Building Your New Tire
After all repairs have been made, the extruder begins a one-step process of applying an uncured bonding layer onto the prepared casing surface, all skives are filled, and shoulders are stripped. Now the casing is ready for its new tread.
Applying New Tread to Your Tire
The OSM builder then applies new tread, automatically insuring that the tread is applied straight, is centered on the casing, and that the splices match.
The Finishing Steps
During the finishing steps, the built tire is encased in an elastic envelope and placed in the curing chamber. The curer is an autoclave-type device that applies heat and pressure, which over time causes the bonding layer in the built tire to cure, permanently adhering the new tread to the prepared casing.
Once the tire has cured for the appropriate time, the tire is removed and ready for the road!