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- Broadly speaking, used paper can be recycled and processed to make recycled pulp. The paper produced by replacing wood pulp can be called recycled paper. For example, industrial waste kraft cartons are used as the main raw material for production. In general, the bottom layer of cardboard gray uses mixed waste paper as the main production material. These products can be referred to as industrial recycled paper. The most commonly used cultural papers for writing and printing are made from bleached chemical wood pulp as raw materials, and such papers can also be made from waste paper materials, and the produced culture paper is called recycled paper. The US Environmental Protection Agency (EPA) stipulates that secondary fiber content must not be less than 50 percent to be called recycled paper. There is no national standard in our country.