a method having the following steps : feeding a plastic material in the area of an inner surface of the mold , conforming the material to the inner surface of the mold , feeding a tubular film into the mold so that the material is positioned between an outer surface of the tubular film and the mold , expanding the tubular film using pressure and / or a vacuum , applying a pressure above atmospheric pressure and / or heating the mold so that the material is partly or completely melted and is adapted to conform to an inner contour of the mold and an outer contour of the expanded tubular film . the tubular film is shaped before it is fed into the mold . the invention further relates to a tubular film and a method for manufacturing the same .