Patent ID: 8048263

Claim:
An alkaline peroxide mechanical pulping process consisting of the steps of: feeding a lignocellulosic material into a first press; pressing the lignocellulosic material; discharging the lignocellulosic material from the first press; impregnating the lignocellulosic material discharged from the first press with a first alkaline peroxide pretreatment solution and maintaining the impregnation for a first reaction time; feeding the lignocellulosic material impregnated with the first pretreatment solution to a refiner having an inlet and a rotating disc within a casing; adding an alkaline peroxide refiner solution to the lignocellulosic material as it is fed to the refiner; mixing the refiner solution and the lignocellulosic material with the refiner as the material is refined to a primary pulp; delivering the primary pulp from the refiner casing to a high consistency tower; retaining the primary pulp in the tower to produce bleached primary pulp; and further processing the bleached primary pulp to a secondary pulp.