Process for the Production of a Paper and a Paper Produced According to the Process

Abstract

A process for producing paper from a furnish comprising fillers and fibers, wherein the furnish is treated with polymers in at least three steps and said furnish contains fillers in such an amount that the paper product obtained by the process contains at least 15% by weight of fillers. The invention also relates to a paper product produced according to the process of the present invention.

1 . A process for the production of a paper product, which process comprises:
 providing a furnish comprising fillers and fibers;   subjecting said furnish to polymer treatment, in which polymers are added to the furnish in at least three steps;   dewatering the furnish on a wire to form a fiber web;   pressing said fiber web;   drying the fiber web to form said paper product,   said furnish containing fillers in such an amount that the paper product obtained by the process contains at least 15% by weight of fillers.   
   
   
       2 . The process as claimed in  claim 1 , wherein the paper product contains 15-70% by weight of fillers. 
   
   
       3 . The process as claimed in  claim 1  or  2 , wherein the polymer used in each of the consecutive polymer treatment steps interacts with the polymer used in the subsequent step. 
   
   
       4 . The process as claimed in any of the preceding claims, wherein at least one of the polymer treatment steps includes the addition of an anionic polymer, and at least one of the polymer treatment steps includes the addition of a cationic polymer. 
   
   
       5 . The process as claimed in  claim 4 , wherein the anionic polymer is CMC. 
   
   
       6 . The process as claimed in  claim 4 , wherein the cationic polymer is cationic starch. 
   
   
       7 . The process as claimed in any of the preceding claims, wherein the polymer treatment comprises three to seven steps. 
   
   
       8 . A paper product produced according to the process of  claim 1 .