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The Process of Papermaking

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The United States had been the world’s leading producer of paper until it was overtaken by China in 2009. The paper industry is dominated by North American, Northern European and East Asian countries. Paper is discovered by the Chinese 2000 years ago, it has been used ever since as a communication medium. Paper is always around with people and paper is actually documenting the world. It plays a vital role as a passport to knowledge, a storage medium, a persuasive tool and an entertaining art form. Paper is a sustainable resource and permanent document. It is the universal medium on which to chronicle every day history which carries the past. Papermaking today is a large, capital-intensive industry, characterized by high speed machines and …show more content…

After that, an alkaline chemical solution and steam are used to dissolve the lignin, the fiber is held together by the glue. The sawdust is cooked in a continuous digester in which the sawdust, chemical solution and steam are added continuously. Then, sawdust pulp is discharged from the digester. The wood chips are cooked in batch digesters where the chips and the chemical solution are added at the beginning of the cooking process. In this process, steam is continuously added to batch digester to cook the chips, and the pulp is discharged at the end. Next, the process of separating the used chemicals from the pulp fiber is done by the brown stock washers. The chemicals are then delivered to the chemical recovery process for reused and recycle in mill (Froass, Ragauskas, & Jiang, 2008). The washed pulp is then processed through screens to removed oversized debris before the high quality fiber is sent to storage for papermaking.
The third stage for paper-making process is mechanical pulping. Mechanical attrition is used to pulp lignocellulosic material to produce the pulp. Lignin is reserved in the pulp to produce good harvest of the pulp. The pulp turns yellow while lignin is exposed to the light and air. Stringer bark and dirt tolerances are used with the chip aged below than two weeks. At the same chip, it is discolored by recession and air oxidation. Before the pulping is

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