FORFARANDE FOR BEREDNING AV PAPPERSMASSA GENOM TERMOMEKANISK SONDERDELNING OCH TORKNING AV DEN ERHALLNA MASSAN

摘要

Dry wood pulp is prepared by thermomechanically pulping wood chips and drying the pulp so formed by contacting it with a gas at a temperature of 300-600.degree.C in or at the entry of a high turbulence mixer through which the pulp and hot gas pass and which exerts a shearing action on the pulp to separate fibre bundles in the pulp. The ratio of moisture to dry wood solids is maintained at less than 5:1 throughout the process. The pulp is suitable for use as fluffing pulp or can be used to directly feed a dry forming paper-making or board-making process.