Corrugated paper, packaging paper, office paper, books and magazines have a high reuse value. The uncontaminated ones can be re-made into paper or cardboard, while the contaminated ones can be used as fuel for power or heat generation, making Refuse Derived Fuel (RDF) and Solid Recovered Fuel (SRF). By shredding, paper and cardboard can be quickly reduced to the required size, helping to speed up screening and sorting; for fuel use, it can be reduced to a uniform size, improving combustion efficiency, generating more energy and reducing carbon emissions.