Method for making a stopper for sparkling wine bottles

A bottle for sparkling wine of the Champagne type, terminated by a neck for receiving a stopper comprising a top end and a bottom end, said bottom end having a base suitable for constituting a fraction of an inside wall of said bottle and an outside wall suitable for bearing against an inside wall of said neck of said bottle,

• wherein the bottle comprises elongated means provided on said inside wall of said neck and extending along a longitudinal axis of said bottle for a distance of more than 5 mm from an end of said neck of said bottle as far as the inside wall of said bottle, said elongated means being tapered only in a direction toward said top end of said neck, for deforming said outside wall of said stopper longitudinally over at least a portion extending from said base of said stopper and for continuing deformation of said outside wall throughout a period said bottle is closed by said stopper so as to make at least one rectilinear channel-forming groove in said stopper, a first end of said channel-forming groove opening out into a portion of said inside wall fraction and a second end of said channel opening out into said outside wall of said stopper, said means thereby enabling an escape of gas contained in said bottle via said first and second ends of said channel-forming groove when said stopper is disengaged from a bottom portion of said neck.