Leaktight chamber, method of manufacture and of packaging liquid in these chambers

A method for the manufacture of bags and for packaging liquid in said bags continuously, comprising the steps of, starting from a film of plastic in strip form, wherein said film in strip form is made to travel longitudinally and wherein the bottom of said pocket is formed between two layers of film in strip form by attaching two films in strip form or by longitudinally folding a film in strip form, two layers of film in strip form appreciably wider than the depth of said pocket and intended to form said chamber are superimposed with the two faces of said pocket and one of their respective edges is aligned with the edges of the opening of said pocket so that access can be had laterally between these layers of film and wherein these layers are made to travel vertically downwards, the layers of film forming said pocket are parted, and said tubular seal and said opening are formed through a portion of its wall adjacent to said chamber, a pipe for withdrawing the liquid fron the chamber is inserted through this tubular seal, two attachment lines appreciably perpendicular to the fold line or join line of the walls of the pocket are formed, one on either side of said withdrawing pipe, between this fold or this join line and the edge of said strip where the various layers of film are aligned, these two attachment lines joining together the layers of film forming the pocket to the layer of film forming the wall of the chamber equipped with the means provided to give access to the inside of said pocket, all the layers of film are then attached, on the one hand transversely to said strip of film, on the other hand, along the two longitudinal edges of said strip of film in order to form said chamber, the upper edge of which is open, this chamber is then filled through this open edge and said bag is closed by attaching all the layers, transversely, along the upper edge of this chamber.