Produced by a compound molding technique, the co-extruded film is a multilayer film that extrudes thermoplastic resin with multiple extruders and passes that through a single die to build up layers of melted resin both on the inside and outside of a film. The film, which is produced on a blown film or cast film extrusion line, can be made with one layer or multiple layers of material. When a film is made with one layer of material, it is called a mono-layer film. When it is made with multiple layers of material, it is called co-extruded film.