Polypropylene referred to as PP, is a colorless, odorless, non-toxic, translucent solid material. Polypropylene is a kind of
thermoplastic synthetic resin with excellent performance. It is a colorless and translucent thermoplastic lightweight general purpose plastic. With chemical resistance, heat resistance, electrical insulation, high strength mechanical properties and good high wear-resistant processing properties, etc., polypropylene has been rapidly developed and applied in many fields such as machinery, automobile, electronic appliances, construction, textile, packaging, agriculture, forestry, fishery and food industry since its emergence.