Autoclave repair of truck or earth mover OTR tires
The problem, of course, with an autoclave is the high cost of the autoclave and particularly for the large diameter tires required, such as 40.00 x 57 and larger.
Assuming that an uncured patch is used on a tire to be cured in an autoclave and the patch is stitched very carefully onto the inside of the tire, the possibility of air pockets between the patch and the inner liner is substantially less. On the other hand, due to the fact that there is no flow in this process, i.e., again how the patch is stitched in is the way it will remain. The chances for this type of repair to stand up are better than the chemical patch but still relies on the quality of the operator and his ability to eliminate air pockets between the patch and the casing.
The energy consumed by an Autoclave, which has to heat up the complete tire to curing temperature and hold this temperature (particularly for large OTR Tires) is very high and costly.
Heating up the complete tire and holding it at cure temperature till cured rather than just the patch area certainly does not improve the quality of the tire and its life span.
Most importantly the repair will come out of the Autoclave exactly the same way it was put in. If the patching is rough, it will come out that way. The rubber is not cured under compression and will not flow and therefore will be less wear resistant.
It is the partnership between the skill and art of properly preparing and patching the area of the tire injury and vulcanizing it subsequently with the proper equipment that will guarantee a perfect repair consistently.
Vulcan-Vulcap Industries Inc. has technical facts on the repair of truck and OTR tire repairs available upon request.