device to produce polyurethane articles covered by a film , including a mold comprising a female part and a male part defining a molding cavity inside which polyurethane material is able to be injected . the device also comprises , in association with the perimeter edge of said female part , means able to exert a connection function in substantial cooperation with the zone of discontinuity between said female part and said male part . the means comprise a movable annular ring - nut including a first position to load a segment of said film in order to insert said segment inside the mold , and a second position at least partly overlapping on the perimeter of said female part in order to cooperate with said female part during the molding of said polyurethane material .