Method for manufacturing filler container chemical pulp

Abstract

The invention relates to a method for improving the manufacturing and usage economy of a filler, in particular a calcium carbonate based filler, used in the manufacture of paper and board, which calcium carbonate based filler is prepared by precipitating calcium carbonate particles onto the surface of noil fibrils. The invention also relates to a method by means of which it is possible to manufacture and/or produce said filler in a form that can be used directly in paper and board applications. Further, an object of the invention is to provide a method for manufacturing paper and/or board, which method makes use of chemical pulp having said filler incorporated therein as dried in chemical pulp bales.

1 . A method for manufacturing filler containing chemical pulp, characterized in that the filler is prepared by precipitating a light-scattering organic or inorganic salt onto the surface of noil fibrils produced by refining from cellulose fibres and/or mechanical pulp fibre, and the thus prepared filler is passed in an aqueous suspension to a chemical pulp dryer to be mixed with chemical pulp and the chemical pulp is dried or said filler is dried, mixed with chemical pulp before the chemical pulp is dried, and the chemical pulp is dried.  
     
     
         2 . A method as claimed in  claim 1 , characterized in that the chemical pulp is dried into bales.  
     
     
         3 . A method as claimed in  claim 1  or  2 , characterized in that the light-scattering organic or inorganic salt is calcium carbonate, gypsum, calcium oxalate, barium sulphate, precipitated silica or silicate, or a combination thereof.  
     
     
         4 . A method as claimed in  claim 1 , characterized in that the light-scattering organic or inorganic salt is calcium carbonate.  
     
     
         5 . A method as claimed in  claim 1 , characterized in that the solids content of the filler in the suspension is 0.1-35 wt. % and, when dried filler is mixed with chemical pulp, the amount of the filler is 1-70 wt.  
     
     
         6 . A method as claimed in  claim 5 , characterized in that the filler content in the suspension is 2-6 wt. %.  
     
     
         7 . A method as claimed in  claim 1 , characterized in that the chemical pulp has been refined.  
     
     
         8 . A method as claimed in  claim 1 , characterized in that the filler contains a dispersing agent.  
     
     
         9 . A method for manufacturing paper or board, characterized in that filler containing chemical pulp or a combination of filler containing chemical pulps manufactured by the method as claimed in  claim 1  is added to a stock blend which is used in the manufacture of paper or board and from which paper or board is made.  
     
     
         10 . A method as claimed in  claim 9 , characterized in that filler containing chemical pulp or a combination of filler containing chemical pulps is pulped and added to a stock blend which is used in the manufacture of paper or board and from which paper or board is made.  
     
     
         11 . The use of filler containing chemical pulp or a combination of filler containing chemical pulps manufactured by the method as claimed in  claim 1  in the manufacture of paper or board.