Fresh-keeping bags are mainly used to put food in the refrigerator to keep food clean and tidy, and to prevent food odors; while ordinary plastic bags are mainly used to hold daily necessities. The materials used are different: fresh-keeping bags are made of food preservation film; ordinary plastic bags are made of plastic as the main raw material, and commonly used materials are polypropylene, polyester, nylon, etc. The principle is different:PE,PVDCFresh-keeping bags are relatively safe; ordinary plastic bags are banned from production and use in some countries due to the disadvantages of extremely long degradation cycle and difficult disposal of plastic bags.12. Different properties: Fresh-keeping bags are bags made of food plastic wrap and are mainly used to preserve vegetables, fruits, grains, cooked food and other foods. Plastic bags are bags made of plastic (commonly used plastics include polypropylene, polyester, nylon, etc.) as the main raw material. They are indispensable items in people’s daily life and are often used to hold other items.22. Different characteristics: plastic bags are cheap, extremely light in weight, large in capacity, and easy to store. Fresh-keeping bags are divided into polyethylene (PE), PVC (pvc), polyvinylidene chloride (PVDC) and other types.3, The principle is different:PE,PVDCFresh-keeping bags are relatively safe.PEMainly used for packaging of fruits, vegetables, etc. The production and use of plastic bags are banned in some countries due to the disadvantages of extremely long degradation cycle and difficult disposal.Choice of plastic bagsPlastic bags have become an essential tool for our travel and shopping. Its convenience and speed bring a lot of convenience to our lives. The use of plastic bags is closely related to our lives. Therefore, it is very important to choose safe and healthy plastic bags correctly. When we go shopping every day, we can choose to use plastic bags in several ways.First of all, choosing safe plastic bags can be done by looking at the color. Under normal circumstances, colored plastic bags are not food-grade enough. It is recommended not to directly hold edible food in such plastic bags. Because most of these plastic bags are recycled waste plastics, they may contain a lot of harmful substances such as dyes and heavy metals, which are harmful to the human body if used directly. At the same time, white or transparent plastic bags can be used with confidence in most cases.We usually pay attention to reducing the use of such plastic bags as much as possible. Although such plastic bags are cheap, their safety has yet to be considered, so we can use this kind of plastic bags to hold domestic waste. That is to say, recycle plastic products reasonably and make our life more convenient, so we can kill two birds with one stone.Secondly, we can also choose plastic bags by smelling them. When we usually use plastic bags for shopping, we can raise our awareness of protection and smell them before use. Qualified and safe plastic bags have no peculiar smell, but inferior plastic bags use a lot of additives. The biggest feature of the bag is the presence of a pungent odor, which we can easily distinguish.Finally, we can also judge the quality of plastic bags by tearing them. Before using plastic bags, we can try to tear the plastic bags and observe the toughness of the plastic bags. Qualified plastic bags have certain elasticity and toughness, and such plastic bags are strong and will not be broken as soon as they are torn, but not The strength and toughness of qualified plastic bags are very poor, and they will basically break when they are torn, and some plastic bags are made of paper.Through the analysis of the above three methods, I believe that everyone has some experience in identifying the advantages and disadvantages of plastic bags. In daily use, we must increase our awareness of use and choose safe and healthy plastic bags. If we use them unreasonably and choose inferior plastic bags, the harmful ingredients in them will endanger our physical and mental health, and the consequences will be disastrous.