NOVELTY - The method comprises coextruding a fluorinated film with a layer of nonfluorinated polymer containing mineral loads (5-30 wt.%), and then delaminating the layer of nonfluorinated polymer. The fluorinated film comprises a layer of fluorinated polymer containing composition A, a layer of fluorinated polymer comprising a composition B having a fluorinated polymer (50-95 wt.%), a homopolymer or copolymer of methyl methacrylate (0-45 wt.%) and a mineral load (5-30 wt.%), a layer of fluorinated polymer comprising composition C, and a layer of fluorinated polymer having a composition D.    USE - The method is useful for manufacturing a fluorinated film, which is useful for protecting a back sheet of a photovoltaic panel (all claimed).    ADVANTAGE - The method is capable of manufacturing the fluorinated film with better surface quality in a simple manner.    DETAILED DESCRIPTION - The method comprises coextruding a fluorinated film with a layer of nonfluorinated polymer containing mineral loads (5-30 wt.%), and then delaminating the layer of nonfluorinated polymer. The fluorinated film comprises a layer of fluorinated polymer containing composition A, a layer of fluorinated polymer comprising a composition B having a fluorinated polymer (50-95 wt.%), a homopolymer or copolymer of methyl methacrylate (0-45 wt.%) and a mineral load (5-30 wt.%), a layer of fluorinated polymer comprising composition C, and a layer of fluorinated polymer having a composition D comprising fluorinated polymer (60-100 wt.%), an UV absorber (0-5 wt.%), mineral load (0-30 wt.%) and poly(methyl methacrylate) (0-40 wt.%). The compositions A and C are identical. The layers having the compositions A and C have a thickness of 1-30 mu m, and the layer having composition B has a thickness of 4-45 mu m. The layer of nonfluorinated polymer has a thickness of 5-20 microns. The film consists of a layer of nonfluorinated charged polymer, a layer of fluorinated film and a layer of nonfluorinated noncharged polymer. A layer of nonfluorinated charged polymer is coextruded with each of the composition A and the compositions C.