FIELD: machine building.
SUBSTANCE: methods of producing mechanical pulp from lignocellulosic material, comprising partial separation of lignocellulosic fibre material in a press for chips followed by impregnation with a liquid, preheating of lignocellulosic material for 20 s or less at pressure between 7.5 bar and 12 bar (in sensor) before mechanically refining lignocellulosic material in a primary mechanical refiner at pressure between 7.5 bar and 12 bar (in sensor) to obtain high-freeness pulp.
EFFECT: high-freeness pulp.
20 cl, 15 dwg, 1 tbl
