a method for continuous packaging in metal packages produced in situ , the invention comprises the fabrication of aluminum containers from aluminum sheet immediately prior to packaging of a material in the containers , the operations being conducted as part of a continuous flow process . the metal packages are produced by thermoforming , that is , the deformation of a heated metal body in a mold by pressure , thereby resulting in the production of containers which are aseptic and which can be easily coated with a protective layer of a plastic or similar material . the invention is particularly useful for the packaging of perishable produce .