Paper/ cardboard has always been one of the most effective industries in reuse and recycling. Traditionally, a part of the paper and cardboard waste has been introduced in the virgin pulp (in the pulper) in the pulp production. The paper degree is defined by the length of the fiber, which is shortened after each trip through the recycling process. There are long fibers of about 3 mm or short fibers between 1 and 2 mm and. It is necessary to get different percentages of these fibers to create the pulp. An example of the corrugated cardboard waste recovery of kraft degree is explored below. Ac