METHOD OF MANUFACTURE OF PNEUMATIC TYRE CASINGS Russian patent published in 1998 - IPC

FIELD: tyre industry. SUBSTANCE: in proposed method of manufacture of pneumatic tyre casings elastomer tyre blank is put onto chuck and breaker is wound by placing threads onto tyre to form network structure. Prior to winding the threads their ends are placed on opposite edges of breaker opposite to each other at distance equal to breaker width and are fixed. Winding is done by laying the coil with tension of 0.01-10 N.thread in antiphase with overlapping and periodical changing of position of laid coil in zone of breaker edge. Distance between points of direction changing in meridional direction is chosen within 0 and 0.35 of breaker width. At winding on of following layers of breaker additional overlapping of coils of preceding layer at breaker edges is done, holding the coils in points of changing of direction of laying by fixing means and, after winding of breaker, layers of breaker are pressed to tyre blank surface. Spreader with slot is used for laying the threads. profile of slot corresponds to surface of tyre blank. Fixing means are in form of set of clamps fitted on ring whose coincides with axis of rotation of tyre blank. Number of clamps is equal to number of points of changing of direction of thread laying, and pitch of clamps is equal to pitch of points in circumferential direction. Set of clamps is arranged at both sides of tyre blank for synchronous rotation with tyre blank. Layers of breaker are pressed to surface of tyre blank by winding on fixing network and edge circumferential threads. Rollers are used for pressing breaker layers to tyre blank surface. Number of threads in coil is from 1 to 16. Prior to winding the threads they are impregnated with adhesive compound and rubber lined. EFFECT: possibility of manufacture of casing with uniform pitch of thread laying without displacement of thread coil to center of breaker. 10 cl, 7 dwg