Printing paper and a method for manufacturing the same

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.

What is claimed is:  
     
         1 . 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.  
     
     
         2 . The method according to  claim 1 , wherein the base paper is calendered before surface sizing in a supercalender or multinip calender.  
     
     
         3 . The method according to  claim 1  or  2 , wherein the base paper is calendered before surface sizing in such a manner that the PPS-10 surface roughness of the same after calendering and before surface sizing is advantageously 1.0 to 1.3 μm .  
     
     
         4 . 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/m 2  per side.  
     
     
         5 . The method according to  claim 4  wherein the amount of surface sizing agent is under 2 g/m 2  per side.  
     
     
         6 . The method according to  claim 3  wherein the amount of surface sizing agent is 0.5 to 1.5 g/m 2  per side.  
     
     
         7 . The method according to  claim 3 , wherein in that the base paper is surface sized on both sides.  
     
     
         8 . The method according to  claim 3 , wherein after surface sizing the base paper is calendered in a calender having one or two nips.  
     
     
         9 . The method according to  claim 8  wherein in that after surface sizing the base paper is calendered in a calender that comprises a nip that is formed between a hard-faced roll and a soft-faced roll.  
     
     
         10 . 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/m 2  per side when calculated in dry matter.  
     
     
         11 . The printing paper according to  claim 10 , wherein the amount of surface sizing agent is 0.5 to 1.5 g/m 2  per side.  
     
     
         12 . The printing paper according to  claim 10  or  11 , wherein the printing paper is surface sized on both sides.