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In general, the classification of plastic bags needs to be differentiated according to the purpose. The plastic packaging bags used in the food industry are special in the selection of materials, because when packaging foods, it is necessary to pay attention to safety, and other toxic substances cannot be added during the process of making the packaging bags. Therefore, this type of packaging bags are made of high-pressure polyethylene materials. People can use food bags such as cakes and teas.

Plastic bags are also used when sorting out garbage or when storing items. The bags used to hold garbage are different from food bags. These bags do not come into contact with food during use. Therefore, it will be made of low-pressure polyethylene material. Users should usually distinguish them according to the purpose when purchasing the bags, so as to avoid the actual application due to improper selection of the bags.

If the classification of plastic bags is not very clear, it can be identified by the appearance of the bags. The food plastic bags will be marked with food-specific words. These classification knowledge should be understood.