At present, there is no unified international standard definition of Biodegradable packing bags, but the definition of Biodegradable packing bags is: under specific environmental conditions, the chemical structure of Biodegradable packing bags changes significantly, and the physical properties of Biodegradable packing bags can pass standard test methods . The molecular chains of Biodegradable packing bags can be biodegraded by microorganisms in the waste treatment system or natural rings in the environment, and finally converted into carbon dioxide (or methane) and water, which enter the biological combined cycle process, and are completely absorbed by the environment without leaving any polymer .

Degradation mechanism of Biodegradable packing bags:
Most of the synthetic pure polymers have the ability to resist microbial erosion. However, additives such as plasticizers, lubricants, pigments, and antioxidants can reduce this ability. The degradation of fatty acids, plasticizers, and even the degradation of fatty acids on the surface of polymer infrastructure will be destroyed by microorganisms. As we all know, the degradation of natural polymers by microorganisms is accomplished by enzymes and proteins produced in the process of biosynthesis. The manufacturer of Biodegradable packing bags tells you that these enzyme proteins can be located in the cell wall or protoplast structure. Some enzymes can sneak into the surrounding environment, while others stay in the cell and are only released when the cell is mechanically dissolved or destroyed. Enzymes have only highly specific catalytic ability for biochemical reactions, and they can proceed quickly under suitable physiological conditions.
There are two degradation methods for Biodegradable packing bags, which can be divided into:
1. Biophysical degradation method: When microorganisms attack and erode high-molecular materials, due to the growth of biological cells, the polymer components are hydrolyzed, ionized or protonated, and then split into oligomer fragments, while the molecular structure of the polymer remains No change, this is the degradation process of polymer biophysical action.
2. Biochemical degradation: The manufacturer of Biodegradable packing bags tells you that due to the direct action of microorganisms or enzymes, polymers are decomposed or oxidized into small molecules, and finally decomposed into carbon dioxide and water. The invention belongs to a biochemical degradation method.