Mechanical pulping

The type of virgin pulp most often used in the production of newsprint and high- circulation magazine papers is obtained by mechanically separating the fibers in wood.Though this is another mainly mechanical process, the amount of energy expended per unit mass of generated pulp is high, and that may explain why there is significant release of soluble and particulate materials into the water phase (Stephenson and Duff 1996).The heating is probably responsible for increased release of material into the water phase
 though the literature search did not reveal data to support such an expectation.