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Cellulose is the most abundant substance in the natural world and is considered as a positive material because it can be recycled. Nanocellulose is made of nano-sized cellulose, and its manufacturing method is divided into physical method, chemical method, and biological method. The nanocellulose produced by physical methods has been studied in many fields such as forestry, medicine, and food science as well as in the field of papermaking because the fibers are fibrillated to nanosize and have high aspect ratio and high strength advantage. Particularly, in the field of paper making, the use of nanocellulose as an additive by using the strength advantage of nanocellulose is high, and as the commercialization research proceeds, the possibility of commercialization of nanocellulose is increasing. However, since it is manufactured by a strong mechanical power, the production cost is high, which causes a trouble to research and commercialization. Therefore, chemical pretreatment or pretreatment of enzymes followed by production of weak mechanical power is widely used.This work was carried out to utilize abandoned waste materials as high value added materials by using waste paper. This work investigated the effect of wet pulp pressing on the fibrillization properties of nanocellulose when producing high value added nanocellulose using white ledger, which is a waste paper that is reused after printing paper is used. In case of white ledger, it is difficult to fibrillate compared with wood pulp due to the hornification. Therefore, in this work, wet pulp was pressed at a pressure of 3.5 MPa, 7 MPa, 10.5 MPa, and 15 MPa, respectively, to grind the fibrillated fibers.(Super Mass colloider Masuko Sangyo, Japan). Fiber analysis, brookfield viscosity measurement, CED measurement and physical property evaluation of the prepared nanocellulose were also carried out.