PROCESS AND APPARATUS FOR BUILDING SELF-SEALING TYRES FOR VEHICLE WHEELS

摘要

The invention relates to a process for building self-sealing tyres for vehicle wheels, wherein a continuous sealing assembly (12) comprising a self-supporting thermoplastic film (11) and a layer of sealing polymeric material (10) associated with and supported by said self-supporting thermoplastic film (11) is cut to size and wound up around a forming drum (14). Components of a green tyre (1) are subsequently formed on the forming drum (14). The tyre is then shaped, moulded and cured. The cutting of the continuous sealing assembly (12) to size comprises: moving a cutting blade (25) heated to a temperature "T" at a speed "V" along a cutting path (C) transverse to the longitudinal extension of the continuous sealing assembly (12), in which the speed "V" and/or the temperature "T" are varied along the mentioned path (C). The invention relates also to an apparatus for building self-sealing tyres for vehicle tyres.