Abstract: A method for manufacturing mechanical pulp. Raw material of the mechanical pulp is introduced. The raw material is refined in a first refining stage to form the mechanical pulp. The pH of the mechanical pulp is adjusted to between 9 and 11 in a process step in which a first process delay is arranged. The first process delay is at least 0.5 hours. The mechanical pulp is sorted into a first accepted stock and a first rejected stock. The first rejected stock is ozonated. The pH of the first rejected stock is at the start of the ozonation process is between 9 and 11. The ozonated first rejected stock is refined in a second refining stage so that at least a part of the ozonated first rejected stock will belong to a second accepted stock. The first accepted stock and the second accepted stock are combined. The mechanical pulp may be used.

Abstract: The object of the present invention is a method for making mechanical pulp, such as thermomechanical or chemi-thermomechanical stock. The mechanical pulp is used as a raw material for printing paper, and its freeness value is 30-70 ml CSF. The stock refined by the method is screened in several stages to form accept and reject stock portions. The wood raw material is refined at the first stage of refining at a superatmospheric pressure of over 400 kPa to form a stock that has a freeness value of 250-700 ml CSF.

Abstract: The object of the present invention is a method for making mechanical pulp, such as thermomechanical or chemi-thermomechanical stock. The mechanical pulp is utilised as a raw material for printing paper, and its freeness value is 30—70 ml CSF. According to the method, the refined stock is screened in several stages into accept and reject stock portions. The stock is screened at a consistency of not less than 10%.

Abstract: The object of the present invention is a method for making mechanical pulp, such as thermomechanical or chemi-thermomechanical stock. The mechanical pulp is used as a raw material for printing paper, and its freeness value is 30-70 ml CSF. The stock refined by the method is screened in several stages to form accept and reject stock portions. The wood raw material is refined at the first stage of refining at a superatmospheric pressure of over 400 kPa to form a stock that has a freeness value of 250-700 ml CSF.

Abstract: The object of the present invention is a method for making mechanical pulp, such as thermomechanical or chemi-thermomechanical stock. The mechanical pulp is utilised as a raw material for printing paper, and its freeness value is 30-70 ml CSF. According to the method, the refined stock is screened in several stages into accept and reject stock portions. The stock is screened at a consistency of not less than 10%.