PP Chinese name is polypropylene, is a kind of propylene monomer by free radical polymerization of the polymer, with non-toxic, odorless, tasteless milky white high crystal shape, belongs to the crystalline material. At present, the domestic production of polypropylene resin varieties are more, the production of large batch of flat filament polypropylene, bidirectional tensile polypropylene special resin (BOPP special material), injection grade polypropylene and ethylene propylene polypropylene.