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Wood is the main source of the fibers used in the large scale industrial production of paper-based products. Paper can be made from other plant fibers such as papyrus, cotton, and flax but wood has much greater availability. Wood fibers come from many different regions and have unique characteristics based on the tree species and the climate they grow in. The various characteristics help developed the properties of different paper products. For example, tissue paper utilizes the soft feeling from thin, flexible eucalyptus fibers, while cardboard boxes are made of strong, bulky stiff fibers like Douglas fir. Pulping breaks down wood chips into individual fibers. The Kraft pulping process uses digestors to process wood chips at high temperature and pressure with a strong acolyte.