FIELD: food industry. SUBSTANCE: invention relates to film that can be used as envelope for foodstuffs. Film is made of thermoplastic mixture that comprises: (a) thermoplastic starch and/or thermoplastic starch derivative; (b) at least one polyester urethane consisting of segments of solid polyurethane and soft polyester disposed in alternating sequence being weight ratio (a) : (b) is in the range from 75:25 to 5:95. Film shows stretching coefficient 2-70 related to surface. If necessary, film can comprise plasticizing agent, softening agent, fibers, filling agents and/or cross-linking agent. Method for preparing film is carried out by extrusion and hose forming followed by hose blowing up with gas. This film is used for making seamless envelope for sausage articles. Invention provides preparing biologically non-decomposable film that is suitable for all types of sausage articles. Film is made by method that is safety for environment. EFFECT: improved making method, valuable properties of film. 4 cl, 1 tbl, 10 ex
