Method for mounting a bottom on a container

The method relates to the introduction of a bottom of a package formed of a tubular body (1) of non-round section. The open end of the body (1) is introduced between two opposing jaws (M1, M2) fixed. The distance between the jaws (M1, M2) being smaller than the distance between the gripped portions (2, 3) a deformation of unclamped portions (4, 5) is obtained. Thus, during the establishment of the bottom, the air escapes and applying on the side of the package (1) a tightening, we obtain the partial evacuation of the air still in the body ( 1) before sealing.