Paper packaging is the most consumed packaging material in the world. As a typical middle-stream industry, its upstream is mainly the paper industry that provides base paper products such as white board, double adhesive paper, coated paper and corrugated paper, as well as the chemical industry and machinery manufacturing industry that provides ink and printing equipment, etc., while its downstream is the electronic and electrical appliances, tobacco, food and beverage, medicine and other end-consumption industries. The application field is very wide.