TSC examined 42 tires ultrasonically. Of these, 10 reportedly had belt-edge separations which had been identified and measured prior to retreading (control group). The remaining 32 were reportedly used casings in good condition ready for retreading. The ultrasonic data were analyzed and numerical scores from 1 (poor) to 9 (excellent), were assigned to tread, belts, sidewalls, and carcass for each tire. The tires were ranked in order of overall numerical scores. In the control group there were 5 tires with a belt score of 5, 4 tires with a belt score of 7 or less. In the group of 32 casings the belt scores were as follows: 3 for one casing, 4 for two casings, 5 for one casing, 6 for five casings, 7 for five casings, 8 for eight casings, 9 for 10 casings. If the threshold score which separates defective casings from the remainder is taken to be 7 (on the basis that all tires in the control group had separations), then 16 tires of the 32 are suspect.
The report covers a test in which 34 retread tires were inspected using reflection ultrasound nondestructive inspection, wheel tested and then subject...
An important problem in retreading tires is the assurance of a satisfactory casing. Since 1972 the National Highway Traffic Safety Administration has ...
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United States Department of Transportation
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