Printing paper and a method for manufacturing the same
AssigneeUpm-Kymmene Corporation
InventorsTimo Koskinen, Pekka Aho, Seppo Sarela
Life of this patent
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Abstract
In the method for manufacturing printing paper the base paper of the printing paper contains mechanical pulp and/or recycled fibre. The method also comprises the surface sizing and calendering of the base paper. In the method the base paper is calendered before surface sizing in a calender that comprises at least one nip that is formed between a hard-faced roll and a soft counter surface. The invention also relates to a printing paper manufactured by means of the method.
Claims12
A method for the manufacture of surface-sized printing paper, the base paper of said printing paper containing mechanical pulp and/or recycled fibre, and said method comprises the surface sizing and calendering of the base paper, wherein the base paper is calendered before surface sizing in a calender comprising at least one nip that is formed between a roll with a hard surface and a soft counter surface.
The method according to any of the preceding claims, wherein after calendering the base paper is surface sized with a surface sizing agent, the amount of the surface sizing agent being 3 g/m2 per side.
A surface-sized printing paper in which the base paper contains mechanical pulp and/or recycled fibre and filler 10 to 40% by weight of the total fibre content, the surface roughness of said printing paper being 2.0 μm at the highest, wherein the amount of surface sizing agent is under 2.0 g/m2 per side when calculated in dry matter.
Dependencies are inferred from the claim text.