Environmental protection plastic bags are widely used: supermarket shopping bags, continuous roll fresh-keeping bags, plastic films and so on. There are examples of large-scale application in China. In Jilin Province, PLA (polylactic acid) was used to replace traditional plastic bags, and good results were achieved. In Sanya, Hainan Province, starch-based biodegradable plastic bags have also entered supermarkets, hotels and other industries for large-scale use.

Environmental protection plastic bags include recycled plastic bags and new plastic bags. Plastic bags with degradable masterbatch added in the production process of plastic bags are called degradable plastic bags, which can decompose automatically after 90 days of degradation under certain conditions.

Extended data

Generally speaking, there are no completely environmentally friendly plastic bags, only some plastic bags are easy to degrade after adding some ingredients. That is, degradable plastics. A certain amount of additives (such as starch, modified starch or other cellulose, photosensitizer, biodegradable agent, etc. ) is added in the production process of plastic packaging products, which reduces the stability of plastic packaging products and is easier to degrade in the natural environment. There are 19 companies in Beijing that develop or produce degradable plastics.

Tests show that most degradable plastics begin to become thinner, lose weight, lose strength and gradually break after being exposed to the general environment for 3 months. If these fragments are buried in garbage or soil, the degradation effect is not obvious. The use of degradable plastics has four disadvantages: first, it consumes a lot of food; Second, the use of degradable plastic products still cannot completely eliminate "visual pollution"; Third, due to technical reasons, the use of degradable plastic products can not completely solve the "potential harm" to the environment; Fourthly, degradable plastics are difficult to recycle because they contain special additives.