. . "a film made of a film-formable high-molecular, for example one selected from polyamides such as nylon 6, nylon 66, nylon 11, nylon 610, copolymerized nylon, and alkoxymethylated nylon, or selected from casein, polyvinyl alcohol, ethylene acrylate copolymer, gelatin, and polyvinyl butyral; and" . .