The plastic shopping bag is a packaging material made of polyolefin as a main raw material and appropriately added with other substances. The polyolefins used are mainly polyethylene (PE), commonly known as soft rubber. The main products include low density polyethylene or high pressure polyethylene (LDPE), high density polyethylene or low pressure polyethylene (HDPE), linear low density polyethylene ( LLDPE) and metallocene polyethylene (mLLDPE) are four major categories. In order to reduce their cost, most companies add about 30% calcium carbonate to make plastic shopping bags. These plastic shopping bags do not emit toxic gases when they are burned in the garbage dump. The national plastic shopping bag standard that has just been introduced divides plastic shopping bags into the following three categories:
Ordinary plastic shopping bags - using polyolefins and fillers as raw materials, such plastic shopping bags do not have degradation properties, and will not degrade in the wild. These plastic shopping bags have excellent recyclability and can be recycled many times. The performance of recycled materials is slightly reduced, but it can be used for shopping bags or garbage bags with low performance requirements and less stringent color requirements. The key question is whether the problem can be recovered.
Starch-based plastic shopping bags--such shopping bags use modified starch as the main raw material, and appropriately add a small amount of other degradable materials to improve their performance. The plastic shopping bag can be naturally degraded after being discarded in the field.