Process for manufacturing a tyre and toroidal support for carrying out said process

摘要

A process for manufacturing a tire by the steps of producing and assembling the tire structural elements on a toroidal support to form a green tire, and the step of precuring at least an inner surface of the green tire by heating the toroidal support. The radially inner surface of the toroidal support is provided with a plurality of protruding elements to reduce the time required for the outer surface of the toroidal support to reach a temperature which is suitable for ensuring a uniform and homogeneous precuring of the inner surface of the green tire, preferably of the inner surface and the bead regions of the green tire.

主权项

1. A process for manufacturing a tyre comprising the steps of:
providing an elastomeric layer on an outer surface of a toroidal support, said surface having a shape substantially matching a shape of an inner surface of said tyre; manufacturing a green tyre by assembling the structural elements thereof on the toroidal support provided with the elastomeric layer; introducing the green tyre supported on the toroidal support into a moulding cavity whose inner walls have a shape substantially matching a shape of an outer surface of the tyre; at least partially precuring the elastomeric layer by heating the toroidal support; introducing a primary working fluid into at least one diffusion gap defined between the inner surface of the green tyre and the toroidal support in order to press the outer surface of the green tyre against the inner walls of the moulding cavity; and curing the green tyre, wherein at least a portion of the radially inner surface of the toroidal support is provided with a plurality of protruding elements, wherein said protruding elements are distributed on the radially inner surface of the toroidal support corresponding to the crown portion of the green tyre, and wherein each of said protruding elements lies in a plane and each plane is substantially perpendicular to the equatorial plane of the toroidal support.