Two-dimensional code is also called two-dimensional bar code, and the common two-dimensional code is QR code, which means rapid response. It is a very popular coding method in mobile devices in recent years, which can store more information and represent more data types than traditional bar codes.

Packaging bag refers to the bag used to package all kinds of articles, which makes the goods easy to transport and store in the process of production and circulation. Widely used in daily life and industrial production. The actual figures show that 80% of the waste plastic bags are finally transported to the garbage dump for treatment like ordinary garbage, and only 7% of the plastic is recycled.