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Tyre Retread
Retreading is the process whereby selected and inspected worn tires, called "casings," receive a new tread. 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. According to the Tyre Retread Information Bureau, ther is no significant difference in quality between new and retread tyres. Many tyres can be repeatedly re-treaded.
STEP 1: Initial inspection evaluates the safety of the casing
At the Initial Inspection stage, a visual and tactile examination of the casing takes place. This stage detects any inherent separations within the casing which are key factors for the following process.
STEP 2: Buffing restores the tyre dimensions and a perfect balance
This process removes the remaining tread and sidewall rubber from the casing to the exact specified dimensions by means of high-speed revolving rasps and brushes.
The granular residue produced during the Buffing process is extracted using high-powered fans and collected in large hoppers ready for recycling.
STEP 3: Skiving and filling repair and save valuable casings
The buffed casing undergoes a further visual inspection with an experienced eye. Any visible cuts or exposed cords are "buzzed" out by hand to establish the degree of damage not visible during the initial casing inspection. Only when satisfied with the casing does the technician sign it off and forward it on to the next process of checking for penetrations within the tubeless liner, which forms the inner wall of the casing.
STEP 4: Building, adding a new tread and even more value
In the pre-cure system, the tread rubber has already been vulcanized with the new tread pattern design. The buffed tyre needs a thin layer of cushion gum to be wrapped around its crown area. The pre-cured tread rubber is then applied with the building machine. This is called the building process.
STEP 5: Curing secures the tread to the casing
The curing process sees the 'built' tyre placed into a hot, segmented radial matrix within a curing press.
The combination of heat, time and pressure ensures that the new rubber is correctly vulcanised, resulting in a tyre with the same tread pattern and depth as the matrix specification for which it was intended.
STEP 6: Final inspection checks safety and perfect appearance
Once the cured tyres have been deflated, removed, cooled and trimmed, they are ready for the Final Inspection process. The examination is a visual and tactile inspection, where a trained eye will spot any imperfections within the tread pattern or sidewall.
Advantages of retreading
• The low cost to retread tyres makes it a cost effective routine
measure for modern tyre-management programme.
• Tyres contain a very large percentage of synthetic rubber, which is
petroleum based. Every time a truck tyre is retreaded there is a
savings of approximately 15 gallons of oil.
• Pre-cure retread tyres are perceived to have higher mileage return
than new tyres. This means better cost savings for the wise fleet
managers.
• It is estimated that millions of tyres are disposed annually, the
practice of retreading would considerably lowering the landfill
disposal.
• Retreading is highly environmentally friendly and is considered as
the best practical environmental option for tyre recycling.
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