| 摘要 |
Expansion process for at least one blank of a toroid ring ( 2 ) formed of an elastomeric material, comprising a stage of partial cross-linking, the said toroid ring being designed, when fully cross-linked and expanded, to constitute at least in part a safety support with a closed-cell alveolar structure, the said support being designed to be fitted on a wheel rim inside a tire, in which on completion of the partial cross-linking phase the toroid ring ( 2 ) is placed in an oven ( 1 ) to undergo an expansion phase therein, characterised in that during the expansion phase the toroid ring ( 2 ) is rotated in a vertical plane by a horizontal rotating spindle ( 3 ) which supports the said toroid ring along its inner circumference.
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