Environment-friendly code-spraying BOPP (Biaxially Oriented Polypropylene) high-speed cigarette packing heat shrinkage film and preparation method thereof

The invention provides an environment-friendly code-spraying BOPP (Biaxially Oriented Polypropylene) high-speed cigarette packing heat shrinkage film and a preparation method thereof. The BOPP thin film is characterized by being prepared by three layer structures including an upper surface layer, a core layer and a lower surface layer through direct co-extrusion and compounding, wherein the uppersurface layer is prepared from ingredients including 90 to 99 weight parts of copolymer polypropylene and 1 to 10 weight parts of printable anti-adhesion masterbatch; the core layer is prepared from the ingredients including 55 to 79 weight parts of homopolymer polypropylene, 20 to 35 weight parts of stiffening agent masterbatch and 1 to 10 weight parts of smoothening-anti-static agent masterbatch; the lower surface layer is prepared from the ingredients including 45 to 84 weight parts of copolymer polypropylene, 10 to 30 weight parts of non-migration smoothening-anti-adhesion masterbatch A, 5to 15 weight parts of non