METHOD OF MANUFACTURE OF PNEUMATIC TYPE CARCASS Russian patent published in 1995 - IPC

FIELD: tyre industry. SUBSTANCE: rubberized nonstretchable threads (H) are wound on cylindrical mandrel to form tubular blank. The latter is cut to form sheet blank and is butt-joined by its edges. Threads are wound in two layers at the same pitch in one direction in staggered order. Threads of one layer are displaced relative to threads of other layer through value equal to half of pitch of groove found from formula: t=2L₁-d/n_o·K, where L₁-length of first stage layer of carcass, m; D-diameter of rubberized flexible members, m; n_o - designed number of threads required to provide necessary strength of carcass; K - coefficient equal to ratio of breaking force of one thread on designed diameter of cord to breaking force one thread of adopted diameter of cord. EFFECT: enhanced quality of tyre carcass. 5 dwg