Polypropylene, abbreviated as PP, is a colorless, odorless, non-toxic, and semi transparent solid substance. Polypropylene is a high-performance thermoplastic synthetic resin, which is a colorless and semi transparent thermoplastic lightweight universal plastic. Polypropylene has chemical resistance, heat resistance, electrical insulation, high-strength mechanical properties, and good wear resistance processing performance. Since its inception, polypropylene has rapidly been widely developed and applied in many fields such as mechanical automobiles, electronic appliances, construction, textiles, packaging, agriculture, forestry, fishery, and food industry.