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What is a paper cover?

Paper covers are generally used for packaging items, and a small number are used for other purposes. There are many kinds of paper, such as student books, exercise books, newspapers, etc., all of which belong to cultural paper. The paper for making RMB belongs to special paper. Corrugated paper, hanging paper, kraft paper and cardboard all belong to packaging paper. Usually, the paper cover that sells waste products is essentially the same as the paper on it, but it is processed into various items, which are used or useless and sold as waste products. Waste paper skins are recycled by paper mills, and then pulped and then made into paper.