100 Per Cent. Improvement in Tyre-casing Performance
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lyikiitsr it is the tread which is subject to direct wear, it ri is the casing structure which eventually determines the nitimate life of a tyre. It has been estimated that, during the normal fife of an average _tyre, every part bends and recovers more than 10,000,000 times, and in the commercial-vehicle field the casing is often subjected to abnormal stresses with which a tyre, under other conditions, does not have to contend. As the result of considerable research at the Dunlop mills at Rochdale, an entirely new technique in the production of casing material has been adopted. The basis of the pro6ess lies in the interlocking of the cotton fibres,: whereby they are firmly gripped and thus prevented from slipping under conditions of severe stress.
A slight variation in the twisting of a fibre of cotton may cause the casing of a giant tyre to crack, after which its complete destruction is only a matter of time.
Test& have been made with tyres having casings built up 'With this new cord and, under conditions Of double -the rated load and developing temperatures exceeding 212 degrees F.,. the indicated improvement in casing performance is said to be 100 per cent.
This new Duracord, which is slightly lighter than normal 'cord, is manufactured by Method's exclusive to the organize, -don of' the Dunlop Rubber Co.. 'Ltd_ Fort Dunlop, Birmingham.