RETREADING

RETREADING

1. RETREAD

Retreading is the process whereby selected and inspected worn tires, called “casings,” receive a new tread. Only sound, carefully inspected tire casings are used for retreading. The worn tread is buffed away, and a new tread bonded to the tire body in a process very similar to the manufacture of a new tire. There are different processing techniques, but the ultimate objective is always the same – affixing a new tread through the application of heat, time and pressure. In Saudi Arabia retreading is done for commercial vehicles tires only.

2. HOW THE RETREAD IS MADE?

Retreading is the generic term for tire reconditioning which extends the useful life of a worn tire for its original purpose by the addition of new material.

The majority of cases the tread rubber is the only part of a tire to wear away. The structure of the tire remains intact. As the tire construction has been produced to be capable of more than one life, to use this potential by replacing the worn tread makes sound environmental and economic sense. Whilst a car tire is retreaded only once, commercial vehicle tires are often retreaded two or three times and aircraft tires many times that can reach 12 times.

After Initial Inspection of the worn casing to judge its acceptability for processing, the remaining unwanted old tread is removed. This process is called BUFFING and it provides a profile and surface texture in preparation for the application of a new tread.

SECONDARY INSPECTION then takes place during which time any necessary correction work is carried out prior to continuation of the process.

The application of a new tread and sometimes sidewall veneer is the next stage. This is called the building process. There are two main ways of building a retreaded tire. With the hot cure or mould cure process, uncured tread rubber is applied to the casing, usually using a strip-winding machine. In the cold cure or pre-cure method a pre-cured tread strip is applied to the casing. When the operator is satisfied that all criteria have been met the built tire then moves on to the curing operation.

CURING or VULCANISATION can also be carried out in different ways. The hot cure process uses an individual curing matrix (known as a mould), similar to that used to cure new tires. In the pre-cure process, however, the tires are cured in an autoclave (curing chamber). Car tires are retreaded exclusively using the hot cure process. Commercial vehicle tires can be retreaded using either process. During the curing process the physical properties of the tread change and the newly applied material forms a permanent chemical bond with the existing casing.

After curing, aFINAL INSPECTIONis made to rule out any defect which would impair serviceability or the safety of the user. Unacceptable tires are rejected and scrapped.

3. Does anybody actually use retreads?

Yes, nearly half the truck and bus tires on the road in the USA, UK and Europe have been retreaded and operate very safely. In fact, all the major tire manufacturers without exception manufacture their tires for multiple lives, meaning they are designed to be retreaded.

Retreads are also used on passenger cars throughout the UK – not only for standard vehicles but for high performance vehicles and even for sport cars.

Retreads are also used in aviation and are retreaded many times. Every commercial airline uses retreaded tires and in fact over 90% of all aircraft tires are retreads.

4. Can you drive at normal speeds on retreads?

Yes, of course. The idea that retreaded tires cannot be used at normal road speeds is a complete myth. All passenger retreads (with the exception of a few specialist winter and off-road tires) are speed rated at least to S (180 kmh – 112mph) and many are rated as high as V (240 kmh – 149 mph)

5. Why use a retread tire?

  • Safety

Retreaded tires are manufactured to high standards using highly skilled technicians and sophisticated machinery.

  • Economy

Retreaded tires can and do perform as well as tires that have never been retreaded and they do it at a substantial savings over the high cost of new tires.

It should be remembered that every major truck tire manufacturer, with no exceptions, manufactures its tires for multiple lives, meaning they are designed to be retreaded. So when an owner operator or a fleet manager doesn’t retread his tires, he is simply throwing money away.

  • Environment

Retreaded tires are manufactured to high standards using highly skilled technicians and sophisticated machinery.

  • Safety

Retread tires in service lower the volume of raw materials required for the manufacturing of a new tire. This includes a pronounced reduction in the use of oil. In fact, the US EPA estimated a greater than 70% savings in oil used for a retread as compared to a new tire. This also means significant reductions in greenhouse gas emissions.

Retreading is highly environmentally friendly and should be considered as the best practical environmental option for tire recycling. Unlike other forms of tire recycling or disposal, retreading does not simply defer the eventual disposal of the tire, but actively contributes towards reducing the amount of tires being used and hence saving valuable natural resources.

6. What about all the rubber we see on the side of motorways. Doesn’t all that come from retreads?

No. This is just as likely to come from a new tire. The fact is that the majority of tire failures are the result of improper tire maintenance. If tires are not regularly checked for damage or under/overinflation there is a risk that they might fail and it doesn’t matter whether they are new tires or retreads.

7. How can I start to retread my tire?

In case you have a light truck or heavy truck commercial vehicle then you will be allowed to retread your tires. In Saudi Arabia, it is illegal to retread passenger tires.

To start you need to fill up the request in this site (press here), then:

  • 1. Technical Sales Representative of Riyadh Retreading Factory will coordinate with you to inspect the used tires you have.
  • 2. The TSR will then prepare the Work Order for your approval
  • 3. Tires will be taken for further evaluation and processing
  • 4. Tires that are rejected during inspection or processing return to you
  • 5. Retreaded tires will then be delivered with invoice after payment.