The invention relates to a method for producing a plastic tubular packaging, said method comprising a rolling step during which a laminate (11) is rolled up, a preparation step during which the edges (8, 9) of the laminate (11) are arranged end-to-end, and a fixing step during which the edges (8, 9) of the laminate (11) are fixed to each other by soldering. Said method is characterised by the fact that a strand of plastic material is extruded and placed, in the melted state (12), on the inner face of the packaging, in such a way as to cover at least the soldering region (10) defined between the edges, the energy required to carry out the soldering (10) being generated from the strand of plastic material (12). The invention also relates to a packaging obtained by said method and to a device for implementing said method.