Method for testing the adhesion between the rubber compound and the cord fabric of a pneumatic tyre

摘要

In a method for determining whether a used tyre exhibits zones of detachment between the rubber compound and the cord fabric or zones of substantial porosity, a radioactive gas which emits gamma-rays is injected under pressure into the tyre in the zone corresponding to the layers of textile fibers which constitute the cord fabric. The gas is allowed to diffuse within the interior of the tyre and to accumulate at the defective points, whereupon the radiation emitted at least at one point of the tyre is detected.