Patent ID: 6802923
Filing Date: 2004-10-12
Classification: B29D,B60C

Abstract:
A process for manufacturing a tire comprising a carcass reinforcement which is radial in the sidewalls and the reinforcement elements of which form with the circumferential direction and radially beneath a crown reinforcement which is composed of at least one layer of radial reinforcement elements forming an angle Â±y2 with said direction, an angle &mnplus;&bgr;2, the tire also comprising annular bead elements, bead profiled elements, bead filler rubbers, bead reinforcement armatures, crown profiled elements, rubber layers between the carcass reinforcement and the crown reinforcement, and a tread comprising a rubber mix(es) over the crown reinforcement, including initially manufacturing a cylindrical blank comprising all the components of the tire, by at least the following steps:a) laying at least one carcass reinforcement ply formed of radial reinforcement elements on the central part of diameter D of a cylindrical building drum; b) laying the annular bead elements, which are inextensible and have an internal diameter D3, the bead profiled elements and bead filler rubbers, and the bead reinforcement armatures, and turning up the edges of the carcass reinforcement ply to form carcass upturns; c) subjecting the central part of said carcass reinforcement ply to an angular variation of its radial reinforcement elements by pre-shaping on said building drum, by increasing the diameter D to a greater diameter D1, such that said radial reinforcement elements become oblique and form with the circumferential direction an angle Â±&bgr;1, said angular variation of the carcass reinforcement ply over a width L being effected by means of a sleeve comprising at least one auxiliary shaping ply N of width L0, which is formed of textile or metallic elements coated in a vulcanized rubber mix and laid on the building drum T for the cylindrical tire blank; d) laying the crown profiled elements and rubber layers between the carcass reinforcement and the crown reinforcement, then radially to the outside laying at least one crown ply formed of reinforcement elements oriented relative to the circumferential direction respectively by an angle Â±y1 wherein |Y1|âˆ’|&bgr;1|&lE;7Â°; and (e) laying the rubber mix(es) of the tread and shaping the cylindrical blank by bringing the internal diameter D1 thereof to the internal diameter D2 of the toric blank of the tire in the vulcanization mold and of the vulcanized tire.