Patent ID: 9604422
Date: 2017-03-28
CPC Classifications: B29D,B60C

Claim:
1. A process for manufacturing a tire in which an uncured blank of the tire is vulcanized in a mold, this tire comprising a layer of cellular material that forms a running layer of a tread of the tire in which hollow tread pattern elements are made, the running layer having wherein: the mold being such that at least 95% of the molding elements each satisfy the following two conditions a) and b): a) setting a value DM during the manufacturing process, and selecting a blowing agent so that the following relationship is maintained: DM=6.85+0.0065 T the molding element is separated from at least one other molding element by a separation distance, expressed in millimeters, of less than or equal to DM, T being the amount of p,p′-oxybis(benzenesulphonyl hydrazide) in the mass of material intended to form the cellular material, and T being greater than or equal to 3 phr, the separation distance between two molding elements being the shortest distance between these two molding elements traveled between these molding elements, and is based on the setting of the DM and the selecting of the blowing agent, b) the molding element is for forming a hollow tread pattern element having a depth at least equal to 80% of the thickness E of the running layer.