Method and equipment for producing tire

Abstract

A green tyre (2) is built on a rigid toroidal support (10) externally having a forming surface (10a) of a conformation corresponding to the inner conformation of the tyre. The built tyre (2) is removed from the rigid toroidal support (10) and engaged on an expandable toroidal support (23) comprising a bladder (24). The green tyre (2) engaged on the expandable toroidal support (23) is introduced into a vulcanisation mould (30) and submitted to a vulcanisation cycle.

Description

technical field [0001] The invention relates to a method and an apparatus for producing tyres. Background technique [0002] Tires for wheels generally comprise a carcass structure comprising at least one carcass ply, each having opposite ends engaged with a corresponding annular anchoring structure integrated into an area commonly referred to as the "bead" Back pad. [0003] Associated with the carcass structure is a belt arrangement comprising one or more belt layers arranged in radially superimposed relationship with respect to each other and with respect to the carcass ply, and having a relative The direction of circumferential extension of the tire crosses oriented and / or substantially parallel textile or metal reinforcing cords. Applied to the belt structure at a radially outer position is a tread band, also made of elastomeric material like the other semi-finished products constituting the tyre. [0004] It should be noted that, for the purposes of the description,...

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Problems solved by technology

[0013] The applicant has also determined that special measures need to be taken to prevent the steam introduced into the green tire from penetrating into the lining structure coating the inner surface of the tire and thereby compromising the structural integrity of the tire

[0014] Furthermore, the Applicant has found that an expandable annular support of the type disclosed in US 5,853,526 has a high manufacturing complexity and requires sophisticated means for controlling the inflation pressure of the bag to ensure the geometry of the bag throughout the tire building process. shape and dimension stable

Furthermore, the manufacture of the reinforcement bag itself is very complex and said bag is subjected to such significant thermal and mechanical stress that it is necessary to replace the reinforcement bag after some vulcanization cycles

[0015] Applicant has also determined that the large number of expandable ring supports required for operation of the construction plant under normal operating conditions results in a significant investment as well as high management and maintenance costs

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