Polypropylene, referred to as PP, is a colorless, odorless, non-toxic, translucent solid substance. [4] Polypropylene is a kind of thermoplastic synthetic resin with excellent performance. It is a colorless translucent thermoplastic lightweight universal plastic. With chemical resistance, heat resistance, electrical insulation, high strength mechanical properties and good high wear-resisting processing properties, polypropylene has been widely developed and applied in many fields such as machinery, automobile, electronics and electrical appliances, construction, textile, packaging, agriculture, forestry, fishery and food industry since it came out.