Plastics are a class of high molecular weight organic compounds, which are a general term for materials formed by filling, plasticizing, coloring, and other thermoplastic processes, belonging to a family of high molecular organic polymers. Common plastic materials mainly include: polystyrene foam (EPS), low-density polyethylene (LDPE), high-density polyethylene (HDPE), polyethylene (PE), polyesters (PET), and polypropylene (PP), etc.