The significance of environmental protection is that environmental protection is to use the theories and methods of environmental science to better utilize natural resources, deeply understand the root causes and hazards of pollution and environmental damage, protect the environment in a planned manner, prevent environmental quality deterioration, control environmental pollution, promote the coordinated development of human beings and the environment, improve the quality of human life, protect human health, and benefit future generations. Maintaining ecological balance and protecting the environment are fundamental issues related to human survival and social development. It is an urgent task to enhance the policy strength of environmental protection so as to better take measures to manage and respond to sudden environmental accidents. We can learn from international best practices and successful corporate experiences to further promote China's sustainable development. When developing national economic construction, we must put environmental protection in the first place.

Biodegradable mailer bags are made of biodegradable materials and cannot be degraded into water and carbon dioxide after 180 days of burial. The soil after composting is rich in nutrients. Biodegradable poly mailers have strong longitudinal and transverse stretching, and their tensile force and load-bearing capacity are equivalent to those of new plastic materials. The materials used to make biodegradable poly mailers are mainly crop starch such as corn. They have excellent biodegradability and can be degraded by microorganisms in the soil to produce CO2 and H2O within one year after being discarded. They are harmless and do not pollute the environment. Biodegradable poly mailers are superior to ordinary black courier bags in terms of bonding tensile strength, environmental protection, puncture strength, swing impact resistance, right-angle tearing force and tensile strength.

Through composting, compostable mailers can be degraded by more than 90% within half a year. If the temperature and humidity are suitable, biodegradable mailer bags can be degraded into carbon dioxide and water in about half a year. Compared with traditional plastic courier bags, biodegradable courier bags are environmentally friendly. The burning of traditional courier bags will produce a large amount of carbon dioxide and toxic gases. Burying will pollute the soil and then pollute groundwater, which is very harmful to the environment. Eco friendly poly mailers are a kind of bio-based packaging bags, using natural bio-based, PBAT (copolymer of butylene adipate and butylene terephthalate) and other raw materials. This material is not only biodegradable, but also compostable.

Biodegradable courier bags are very strict in the selection of raw materials. They must not only meet the conditions for degradation, but also be no less than the performance requirements of ordinary courier bags. In addition, the raw materials of biodegradable courier bags have high temperature requirements. Whether it is the film blowing process or the bag making process, the temperature must be adapted to the material. Once the temperature is not well controlled, it is difficult to process. The temperature control and machine performance requirements are also very high.

Although the current production process and technology of biodegradable courier bags are complex and the cost is 2-3 times higher than that of ordinary courier bags, due to its environmental protection, biodegradable courier bags are decomposed into plant nutrients, reducing the pollution of air and soil in the environment, and truly achieving the purpose of originating from nature and returning to nature. This will be a new opportunity for the development of the green courier industry. China is a major producer and consumer of packaging bags. With the development of the e-commerce express industry and the improvement of people's environmental awareness, our country attaches great importance to environmental issues. The promotion and application of biodegradable courier bags will definitely be a transformation of green development.