The invention relates to a method of manufacturing mechanical and chemi-mechanical papermaking pulp with low energy input by disintegrating and beating wood material in at least two steps. According to the invention, the material is coarse-disintegrated in a first step at a concentration exceeding 20 %, acid groups in the wood material are neutralized, the material is diluted to a concentration of 1-10 % and beaten in one or several steps.
Granted in Sweden SE461103 (B) ― 1990-01-08, Canada CA1320067 (C) ― 1993-07-13, Germany DE68909231 (T2) ― 1994-04-28 and Finland FI91787 (C) ― 1994-08-10.