Process for producing pneumatic tyres
AssigneePirelli Tyre S.p.A.
InventorGianni Mancini
Life of this patent
Estimating the term…
Abstract
Along a building line, a green tyre is built on a rigid toroidal support having an outer surface substantially conforming in shape to an inner surface of the green tyre. The green tyre is then transferred to a bead moulding and prevulcanisation station where each bead of the tyre is moulded by tightening it between a surface portion of the toroidal support and an annular clamping surface carried by a removable tightening flange. The tightened beads are prevulcanised through a heat supply by means of electric resistors integrated into the tightening flanges. The tyre with the prevulcanised and tightened beads is transferred into a moulding cavity having an inner wall of a shape substantially conforming to that of the outer surface of the moulded tyre, to carry out moulding of the tyre and complete vulcanisation of same.
Claims14
A process for producing pneumatic tyres, comprising:
- building a green tyre on a toroidal support, said green tyre having a pair of beads each defined along a respective inner circumferential edge of said tyre, said toroidal support having an outer surface the shape of which substantially matches that of an inner surface of the green tyre;
- moulding each bead by tightening the bead between a surface portion of the toroidal support and an annular clamping surface axially opposite to the surface portion of the toroidal support;
- transferring the tyre with the beads maintained to a tightened condition, into a moulding cavity, said moulding cavity having an inner wall substantially conforming in shape to an outer surface of the tyre;
- and
- moulding and vulcanizing the tyre,
- wherein an at least partial vulcanization of each bead is achieved while said bead is tightened between said surface portion of the toroidal support and said annular clamping surface and before transferring the tyre into the moulding cavity,
- whereby transferring the tyre into the moulding cavity is carried out with the beads at least partially vulcanized.
Dependencies are inferred from the claim text.