Abstract: A plant and a process for producing tyres for vehicle wheels, includes the steps of: a) building a carcass structure of a green tyre on a first forming drum in at least one carcass structure building line, the carcass structure including at least one carcass ply and a pair of annular anchoring structures; b) building a crown structure of a green tyre on at least one second forming drum in at least one crown structure building line, the crown structure including at least one belt structure and a tread band; c) toroidally shaping the carcass structure assembling it to the crown structure in at least one assembling and shaping work station for the tyre being processed, the assembling and shaping work station being synchronized with the carcass structure building line and with the crown structure building line; wherein each carcass structure is associated with the respective first forming drum whereon it is built up to the end of step c) of shaping and assembling the tyre being processed; and d) moulding and vulc

Abstract: During building of a carcass structure, a liner is applied around an outer surface of a primary drum by: circumferentially winding at least one pair of sheets of elastomeric material around an outer surface of the primary drum, which sheets are axially spaced apart from each other so as to form respective axially external portions of the liner; laying at least one continuous elongated element of elastomeric material in the form of a plurality of mutually approached coils around the outer surface of the primary drum in order to form a central portion of the liner having axially external edges that are each associated with an axially internal edge of one of said axially external portions of the liner.

Abstract: During building of a carcass structure, a liner is applied around an outer surface of a primary drum by: circumferentially winding at least one pair of sheets of elastomeric material around an outer surface of the primary drum, which sheets are axially spaced apart from each other so as to form respective axially external portions of the liner; laying at least one continuous elongated element of elastomeric material in the form of a plurality of mutually approached coils around the outer surface of the primary drum in order to form a central portion of the liner having axially external edges that are each associated with an axially internal edge of one of said axially external portions of the liner.

Abstract: A plant and a process for producing tyres for vehicle wheels, includes the steps of: a) building a carcass structure of a green tyre on a first forming drum in at least one carcass structure building line, the carcass structure including at least one carcass ply and a pair of annular anchoring structures; b) building a crown structure of a green tyre on at least one second forming drum in at least one crown structure building line, the crown structure including at least one belt structure and a tread band; c) toroidally shaping the carcass structure assembling it to the crown structure in at least one assembling and shaping work station for the tyre being processed, the assembling and shaping work station being synchronised with the carcass structure building line and with the crown structure building line; wherein each carcass structure is associated with the respective first forming drum whereon it is built up to the end of step c) of shaping and assembling the tyre being processed; and d) moulding and vulc

Abstract: A process for building tyres for vehicle wheels includes the steps of: i) building a carcass structure of a green tyre in at least one carcass structure building line, the carcass structure including at least one carcass ply and a pair of annular anchoring structures; ii) building a crown structure of a green tyre in at least one crown structure building line, the crown structure including a belt structure and a tread band; wherein step ii) of building the crown structure includes at least one step iii) of building the belt structure which in turn includes the steps of: a) building on at least one first building drum, an annular assembly including a first radially inner belt layer and at least a second belt layer radially external to the first belt layer; b) transferring the annular assembly on at least one auxiliary drum; c) turning up axially opposite end portions of the fast radially inner belt layer so as to obtain at least a partial overlapping of the end portions of the first belt layer on the at least

Abstract: A process for building tyres for vehicle wheels wherein each tyre includes a carcass structure and a crown structure, the crown structure including a belt structure including a first radially inner belt layer and at least one second belt layer radially external to the first belt layer, the process including the steps of: a) placing an annular assembly including a first radially inner belt layer and at least one second radially outer belt layer on at least one auxiliary turning up drum; b) defining at least one pair of folding lines in axially opposite positions of the annular assembly by respective abutment devices radially external to the auxiliary turning up drum; c) adjusting the axial position of the folding lines relative to a centre line plane of the auxiliary turning up drum; and d) turning up, at the folding lines, at least a part of end portions of the first belt layer axially protruding relative to the at least one second belt layer on the at least one second belt layer of the annular assembly.

Abstract: An apparatus for manufacturing a vehicle tire includes means for preparing and toroidally shaping a carcass structure, preparing and arranging a belt structure as a crown around the carcass structure, and wrapping a tread around the belt structure. The means for preparing the belt structure includes an extrusion apparatus for forming a sheet of rubber-coated fabric including a plurality of reinforcing cords substantially parallel to one another, means for conveying the sheet, a first cutting device for cutting the sheet to obtain a plurality of strips, a device for transferring the strips, a device for splicing the strips to form a substantially continuous belt assembly, means for conveying the strips and the belt assembly, second and third cutting devices, means for conveying the belt strips and portions of the belt strips, and at least one assembly drum adapted to support the portions of the belt strips.

Abstract: A method and a plant for manufacturing a belt structure of a green tire are described, wherein the portions (49a, 49b) of the belt strips (19a, 19b) constituting the belt structure are produced in a substantially continuous manner immediately upstream of at least one assembly drum (50, 51). Such method and plant are integrated respectively in a method and in a plant for manufacturing, in a substantially continuous manner, a belt package and a crown structure incorporating the belt structure thus obtained. The method for manufacturing the belt package comprises the subsequent formation on the belt structure of a rubber mixture layer incorporating a plurality of reinforcing cords (5), whereas the method for manufacturing the crown structure comprises the subsequent assembly of a tread (7) on the belt package thus formed.

Abstract: A method for manufacturing a belt structure of a vehicle tire includes the steps of preparing a belt assembly, cutting the belt assembly to obtain first and second substantially-continuous belt strips, supplying the first and second belt strips to at least one assembly drum, and superposing on the at least one assembly drum portions of the first and second belt strips to obtain a belt structure comprising radially-superposed portions of the first and second belt strips.

Abstract: A method and a plant for manufacturing a belt structure of a green tire are described, wherein the portions (49a, 49b) of the belt strips (19a, 19b) constituting the belt structure are produced in a substantially continuous manner immediately upstream of at least one assembly drum (50, 51).