How much do you know about plastic bags? Plastic packaging bags are common daily necessities in our lives. Many people think of them as just a little plastic wrap and don’t need to know much. However, you need to know that plastic packaging bags can only play their due role if they are used correctly.Vest bags used in daily life are mainly used to hold things. Plastic bags also need to be sorted. For example, garbage bags sold in supermarkets cannot be used as food. The trash bags sold in supermarkets are labeled for what they are used for, so people don’t use them for other things when they see them.When making plastic bags, the materials used vary depending on the purpose. The raw materials for making plastic bags are polyethylene, polypropylene and polyvinyl chloride. The use of plastic bags made of these two different materials is completely different. Because the nature of raw materials determines the use of plastic bags,For example, polyethylene plastic bags can hold food, but PVC plastic bags cannot hold food. This is because polyvinyl chloride itself is toxic, so plastic bags made of this material must not hold things that people touch and eat.If you want to know how plastic bags are classified, you need to know the material of plastic bags. If polyethylene is subdivided, it can also be divided into high-pressure polyethylene and low-pressure polyethylene. The plastic bag usually used for food is this kind of high-pressure polyethylene plastic bag, which is non-toxic and harmless, and can ensure people’s health and food safety.