There are basically two main sources of waste plastic production:

(1) Waste products, defective products, scraps, offsets, test materials, mixing materials and so on produced in the production process of plastic products molding processing plant. This kind of waste plastic pollution is less, generally can be used after crushing.

② from the use and consumption process of all kinds of plastic products. From the domestic point of view, mainly agricultural plastic. Packaging plastic, daily necessities three major fields. This kind of waste plastic is usually a mixed system of two or more kinds of waste plastic and other substances (such as metal, glass, paper, soil, water, etc.), which not only brings difficulties to recycling, but also degrades the quality of recycled products.