Paper Manufacturing Process

Abstract

The invention relates to a method for manufacturing a web comprising wood-based fibres and man-made fibres. A polymer is added to a fibre suspension comprising wood-based fibres and man-made fibres to improve the web formation and to slow down the removal of water in the wire section of the paper machine.

1 . A method for the manufacture of a web comprising wood-based fibres and man-made fibres, the method comprising adding a polymer to a fibre suspension comprising the wood-based fibres and man-made fibres to improve the web formation and to slow down the removal of water in the wire section of the paper machine, characterized in that the fibre suspension is treated mechanically during the web formation on a wire by shaking the wire, allowing the surface of the pulp layer to oscillate, or using a roll on the upper surface of the wire.  
   
   
       2 . The method according to  claim 1 , characterized in that the polymer is an anionic polyacrylamide with a molecular weight of at least 10,000,000 g/mol.  
   
   
       3 . The method according to  claim 1 , characterized in that the polymer is carboxymethyl cellulose with a molecular weight of at least 750,000 g/mol.  
   
   
       4 . The method according to  claim 1 , characterized in that the polymer is guargum.  
   
   
       5 . The method according to  claim 1 , characterized in that the polymer is added into a pulp mixing tank, before the machine screen or after the machine screen.  
   
   
       6 . The method according to  claim 1 , characterized in that the pH of the fibre suspension is adjusted to at least 6.5.