Esprito BOPP film is produced by a tubular process, in which a tubular bubble is inflated, or a tenter frame process, in which a thick extruded sheet is heated to its softening point (not to the melting point) and is mechanically stretched by 300–400%.The film thickness ranges from 15 to 60 micron, and is composed of at least three layers: the middle layer is the thickest and contributes almost exclusively to the mechanical properties; the two outer layers lend various properties to the film
The main raw material, in the central layer, is the isotactic Polypropylene, a semi-crystalline and thermoplastic material. Whereas, for the outer layers, ethylene-propylene and/or ethylene-butane-propylene copolymers are used. These materials are introduced inside the extruders by a hopper system. Inside the extruders, the materials are melted and brought to 200-230°C and then conveyed through the extrusion head, where they emerge in the form of foil.The foil is then placed in direct contact with a cooled cylinder and immersed in a water bath to quench the melt.
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