China began to introduce foreign equipment to produce plastic pallets since the 1980s, but due to cost and other factors, the market has never been opened up. The expanded production of general industrial plastic pallets created conditions for plastic pallets. Before adopting various plastic regeneration methods to recycle waste plastics, most plastics need to be sorted. Due to the complexity of plastic consumption channels, some used plastics cannot be easily distinguished by appearance alone; therefore, it would be best to mark the material type on plastic products. China has developed a "plastic packaging product recycling mark" by referring to the material marking proposed and implemented by the American Plastics Association, which can help with sorting using the above-mentioned marking method. However, because there are still many unmarked plastic products in China, sorting becomes difficult, making it necessary to separate different types of plastics for classified recycling.
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