Method for inverting the base of a plastic container, device for implementing same and use of the device

A method for inverting the diaphragm (7) of a filled and capped container (2) comprising a body (3) extended, at the top, by a shoulder (4) surmounted by a neck (5) and comprising, in the continuation of the body (3) toward the bottom, a base (6) comprising the diaphragm (7) contained in a ring (8) ending in a peripheral seating surface (9) forming a standing plane, according to which method the container (2) is placed beforehand on a support ring (13) of an inversion device (1), a pressing member (17) is applied to the container (2) and a pusher (16) is raised up through the support ring (13) to invert the diaphragm (7) and shape it into an arch, wherein, while the pusher (16) is inverting the diaphragm (7), the seating surface (9) is distanced from the upper plane (15) of the support ring (7) so that, when the pusher (16) reaches its raised position, a space is opened up between the seating surface (9) and the support ring (13) so as to allow longitudinal expansion of the container under the combined effect of the increase in internal pressure brought about by the reduction in volume caused by the inversion and of the forces generated inside the container (2) by the pusher (16) and the pressing member (17).