Patent ID: 8414809

Claim:
A process for the production of stoppers of composite material for sparkling wines in bottles at a pressure of more than 1.5 bar, characterised in that it comprises: individual moulding and partial interpenetration of separate portions of the stoppers, each portion consisting of a cork agglomerate, closely bonded and produced from granulates of different granulometry, a first portion being 10 to 90% by volume of the stopper and comprising a first agglomerate, obtained from a first granulate of cork with granulometry of between 2 and 10 mm; a second portion being 90 to 10% by volume of the stopper and comprising a second agglomerate, obtained from a second granulate of cork with granulometry of between 0.25 and 4 mm, wherein the first agglomerate and the second agglomerate are supplied to a single mould through two separate feeder systems.