Don’t get tired repairing Tyres

Tyre Maintenance

Don’t get tired repairing Tyres

OTR tire repair: A look behind the scenes
In open-cast mines, heavy vehicles carrying heavy loads on tracks and places where fist-sized stones are not even recognized as inconveniences, put highest demands on their tyres. To reduce truck life-cycle costs, these costly equipment should be repaired instead of being exchanged.
(ed. WoMaMarcel - 16/12/2014)
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Repair Process – from Preparation to Vulcanization

In the first phase, the damaged tire is cleaned, thoroughly inspected and the degree of damage measured. Loose rubber parts or any damaged carcass wires are removed. The damaged area is roughened and the reinforcement patch placed in position. The damaged area is then filled with MTR repair rubber. If the extent of damage to an OTR tire is great, up to 12 kg of filler may be necessary.

This is followed by the process of vulcanization in which the filled rubber mixture is vulcanized in a skive. Two different processes are possible: the 1-way or the 2-way system, each having its own advantages and disadvantages. The advantage of the 1-way process is the fast repair time because the damaged area and the strengthening patch are vulcanized in one working step. For a tire with sidewall damage this means, for example, that it can again be used after 10 to 12 hours of vulcanization and a 2 to 3 hours cooling-off period. In the 2-way system, in contrast, only the damaged area undergoes hot vulcanization. The reinforcement patch is subsequently cold vulcanized. This process takes longer but is particularly kind to the tire since the heat is only applied to the damaged area.

A considerable difference between both processes is, however, the price of the equipment required. The large heating autoclaves and vulcanizing equipment necessary for the 1-way system are considerably more expensive than machines such as Rema Tip Top’s Thermopress used in the 2-way vulcanization process. But what counts most is the final result – and that is equally good for both systems.

Material, Tools etc.

As outlined before, the quality of the tire repair is independent of the chosen process. What is decisive is the complete OTR tire repair system together with its compatible consumables such as reinforcement patches, repair rubber, vulcanizing solutions and tools used for the repair. Rema Tip Top experts regularly visit OTR tire repair workshops throughout the world in order to obtain first-hand information on damage, the work required and the needs of the workshops. This information is the base for the ongoing optimization and extension of the product port­folio.

In addition, Rema Tip Top places particular emphasis on carrying out workshop audits and training. This is because only when the repair mechanics are capable of handling the tools and equipment competently can the huge tires of these mining vehicles be repaired professionally and quickly – and at last that is what really counts.

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