| 摘要 |
<p>The invention relates to the use of precipitated calcium carbonates (PCC) as fillers for the manufacture of base paper together with mechanical hardwood pulp and chemical softwood pulp, and to a method for the manufacture of base paper, in which method pulp produced from hard woods, in particular from the wood of the genus Populus, and chemical softwood pulp are used together with a PCC filler. The use of precipitated calcium carbonate (PCC) for the manufacture of base paper together with mechanical hardwood pulp and chemical softwood pulp is characterized in that ≥ 20 wt-% of the fibres of the mechanical hardwood pulp is included in the fibre size fraction of < 200 mesh and 10 - 40 wt-% of them is included in the fibre size fraction of 28/48 mesh, the brightness of the mechanical hardwood pulp is ≥ 75, the particle size distribution of the precipitated calcium carbonate is 90 % ≤ 9 µm, 50 % ≤ 5 µm and 20 % ≤ 1.5 µm, and the basis weight of the base paper is 25 - 150 g/m2.</p> |
