Noil for use in paper manufacture, method for its production, and paper pulp and paper containing such noil

Abstract

Disclosed herein is paper pulp and a method of making paper pulp. The paper pulp includes at least one of cellulose fibre and mechanical pulp fibre, filler, and noil produced from refined cellulose fibre in a range of 0.1 to 15% by weight of the paper pulp. The noil includes noil fibrils having a size distribution corresponding to a Bauer-McNett wire screen fraction size P50. The paper pulp is adapted for use in manufacturing at least one of printing paper and graphic cardboard paper. The method includes refining cellulose fibre to produce noil including noil fibrils having a size distribution corresponding to a Bauer-McNett wire screen fraction size P50. The method also includes mixing filler and the noil with at least one of cellulose fibre and mechanical pulp fibre, such that the noil comprises between 0.1 and 15% by weight of the paper pulp.

1 . A paper pulp, comprising: 
 at least one of cellulose fibre and mechanical pulp fibre;    filler; and    noil produced from refined cellulose fibre in a range of 0.1 to 15% by weight of the paper pulp, the noil including noil fibrils having a size distribution corresponding to a Bauer-McNett wire screen fraction size P50, wherein the paper pulp is adapted for use in manufacturing at least one of printing paper and graphic cardboard paper.    
     
     
         2 . The paper pulp according to  claim 1 , wherein the noil fibrils have a size distribution substantially corresponding to a Bauer-McNett wire screen fraction size P100.  
     
     
         3 . The paper pulp according to  claim 1 , wherein the paper pulp contains pigment and the mass ratio of pigment to noil is between 0.1 and 20.  
     
     
         4 . The paper pulp according to  claim 1 , wherein the noil is produced by refining cellulose fibre to a Schopper-Riegler number greater than 80.  
     
     
         5 . The paper pulp according to  claim 4 , wherein the cellulose fibre is further refined to a Schopper-Riegler number in the range between 85 and 90.  
     
     
         6 . A method for producing paper pulp adapted for use in manufacturing at least one of printing paper and graphic cardboard paper, the method comprising: 
 refining cellulose fibre to produce noil comprising noil fibrils having a size distribution corresponding to a Bauer-McNett wire screen fraction size P50; and    mixing filler and the noil with at least one of cellulose fibre and mechanical pulp fibre, such that the noil comprises between 0.1 and 15% by weight of the paper pulp.    
     
     
         7 . A paper manufactured using the paper pulp manufacturing method according to  claim 6 .  
     
     
         8 . The method according to  claim 6 , further comprising refining cellulose fibre to produce noil comprising noil fibrils having a size distribution corresponding to a Bauer-McNett wire screen fraction size P100.  
     
     
         9 . The method according to  claim 6 , further comprising refining cellulose fibre to produce noil comprising noil fibrils having a Schopper-Riegler number greater than 80.  
     
     
         10 . The method according to  claim 9 , further comprising refining cellulose fibre to produce noil comprising noil fibrils having a Schopper-Riegler number between 85 and 90.