Food packagingFilm packagingBiodegradable filmMulti-layer filmBiodegradable polymersCHICKEN SKIN GELATINSUPERCRITICAL CO2 IMPREGNATIONWATER-VAPOR BARRIERPROTEIN-BASED FILMSPOLY(LACTIC ACID)FUNCTIONAL-PROPERTIESBILAYER FILMSEDIBLE FILMSCARBOXYMETHYL CELLULOSEANTIOXIDANT PROPERTIES