2. |
- Engstrand, Per, 1955-, et al.
(författare)
-
A method of producing cellulosic pulp
- 1991
-
Patent (populärvet., debatt m.m.)abstract
- Mechanical and chemimechanical cellulose pulp, particularly paper pulp, is produced at a low energy input by disintegrating and beating wood material in one or more stages. Acccording to the invention, a substance capable of forming complexes with polyvalent metal ions, particularly calcium ions, so-called complexing agent, is added to the wood material prior to the beating process in order to replace said calcium or other polyvalent metal ions with sodium ions, therewith a further reduction in the energy input is obtained.
|
|