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PCR materials are plastics that are produced after circulation, consumption, and use. The plastics that are sorted, processed, cleaned, and produced are called post-consumer plastics (Post Consumer Recycling, or PCR for short). The concept is proposed by the CU certification. The certification promotion was first promoted in the textile industry, and now it has expanded to various fields of application of plastics. It is an environmental protection project mainly to promote the recycling of resources and reduce carbon emissions.