Effect of Extractives on Pulping

Paper used for writing, printing, and drawing has been made from fibers from various sources for centuries. With the increasing importance of paper in the past two centuries, the supply of raw materials then used became inadequate for the need, and attention was given to alternative supplies. Wood gained importance as a source of fiber in 1844 when grinding wood to pulp was introduced and subsequently when chemical processes were also used. Now, globally, wood supplies more than 94% of pulp fiber and in countries such as the United States, the amount is higher than 98%.