The plastic industry belongs to the polymer industry, which is a link of the petrochemical industry and has a high degree of correlation. It is a multi-level processing industry. Plastic is oil or natural gas as raw material, after refining, cracking into a variety of basic petrochemical raw materials (monomer), and then obtained by the polymerization reaction of the polymer resin. Various types of plastic through the gradual processing of derivatives derived from a variety of downstream products, including rubber, coatings, adhesives, man-made fibers, synthetic resins.