Container intended for contents under pressure together with a method for the manufacture of such a container

A method for the manufacture of a container comprising the steps of providing at least two folding indication lines along a central portion of a web of sheet metal having at least one of its sides covered with a thermoplastic lining, said folding indication lines being parallel with a longitudinal axis of the web and with each other, compression moulding and simultaneously stretching areas of the web on each side of said folding indication lines to obtain shell-shaped cavities situated directly opposite one another on the web and surrounded by flanges, folding the web along said folding indication lines such that non-moulded longitudinal edge zones of the web are brought together, sealing said edge zones to each other by surface melting the thermoplastic lining of the web within the edge zones thereby forming a tube of elongated, triangular cross-section with the compression moulded shell-shaped cavities facing one another in pairs on opposite side walls of the triangular tube and a flat base of the triangular tube being formed between said folding indication lines, introducing contents into the tube through a filler pipe passed into the tube, pressing the side walls of the triangular tube together adjacent the base and downstream of the filler pipe after filling of the individual facing cavities to flatten said base to form a flat flange, subsequently sealing the tube along the flanges, dividing the tube into individual containers by cutting or punching through the web in the area between successive containers, and folding the flanges around the filled cavity of the container against the container body.