PNEUMATIC TYRE WITH CARCASS FASTENING CIRCULAR WIRES AND METHOD OF PREPARATION OF SUCH WIRES Russian patent published in 1999 - IPC

FIELD: tyre industry; pneumatic tyres for road vehicles. SUBSTANCE: anchor fastening of carcass supporting members is provided by circular wires with binding caoutchouc composition introduced between wires. Circular wire is laid in several turns, forming one or several spiral coils. These wires have coefficient of functional expansion elongation A_f= A_e+A_p exceeding 4%. This coefficient does not contain specific elongation A_s caused by "cable" effect. Maximum stress R_m of wire in preferred version exceeds 2000 Mpa.. Circular wires are subjected to thermal treatment being reducing annealing as to combination of characteristics. Thermal treatment is carried out directly on wire containing cores with coating preliminarily applied to each core to contribute adhesion. EFFECT: increased strength of tyres. 16 cl, 8 dwg