CPC B29D 30/36 (2013.01) [B29D 30/1621 (2013.01); B29D 30/1628 (2013.01); B29D 30/247 (2013.01); B29D 30/08 (2013.01); B29D 30/24 (2013.01); B29D 30/244 (2013.01); B29D 30/245 (2013.01); B29D 2030/265 (2013.01); B29D 2030/2642 (2013.01); B29D 2030/2657 (2013.01)] | 6 Claims |
1. A method for building tyres comprising:
building a carcass sleeve and a crown structure of each tyre in sequence relative to each other, wherein the sequence comprises:
arranging an expandable toroidal forming drum having a radially external toroidal surface configured for contacting a radially inner surface of the carcass sleeve;
positioning the carcass sleeve at a radially external position relative to the expandable toroidal forming drum and spaced from the expandable toroidal forming drum;
shaping the carcass sleeve as a toroid until reaching a maximum carcass sleeve diameter at the radially inner surface of the carcass sleeve, while said forming drum is positioned inside, and spaced from, the carcass sleeve;
expanding the expandable toroidal forming drum to form an expanded toroidal forming drum remaining spaced from the carcass sleeve and exhibiting a maximum forming drum diameter;
radially contracting the carcass sleeve shaped as a toroid for subsequently contacting the radially internal surface of the carcass sleeve to the expanded toroidal forming drum; and
building the crown structure directly on a radially external surface of the carcass sleeve shaped as a toroid and contacted with the expanded toroidal forming drum.
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