Medium for increasing the absorption capacity of paper pulp for starch

Abstract

The present invention relates to a medium for increasing the absorption capacity for starch of paper or paper pulp in a fibre slurry for paper manufacture, the medium containing cereal meal and/or starch, in particular rye meal, together with a polymer with vinylamine units.

1 . A medium for increasing the absorption capacity of paper pulp for starch, comprising: 
 at least one of cereal meal and starch;    and a polymer with vinylamine units;    said medium obtainable by mixing the said at least one of cereal meal and the starch and the polymer with vinylamine units in an extruder.    
     
     
         2 . A medium according to  claim 1 , wherein the medium is obtainable by mixing cereal meal with 5 to 30 wt % of polymer with vinylamine units, with reference to the cereal meal, in an extruder.  
     
     
         3 . A medium according to  claim 1  wherein the cereal meal is rye meal.  
     
     
         4 . A medium according to  claim 1 , wherein the starch is rye starch.  
     
     
         5 . A medium according to  claim 1 , wherein the polymer with vinylamine units is a hompolymer and/or a copolymer.  
     
     
         6 . A medium according to  claim 1  containing rye meal and 5 to 30 wt % of polymer with vinylamine units, with reference to the rye meal content.  
     
     
         7 . A medium according to  claim 1 , wherein the polymer with vinylamine units is a completely hydrolysed homopolymer of N-vinylformamide.  
     
     
         8 . A method of preparing a medium for increasing the absorption capacity of paper pulp for starch, characterised in that at least one of cereal meal and starch, and a polymer with vinylamine units are mixed in an extruder.  
     
     
         9 . A method according to  claim 8 , wherein water is additionally added.  
     
     
         10 . A method according to  claim 8 , wherein water is added entirely or partially in the form of water vapour.  
     
     
         11 . A method according to  claim 8 , wherein rye meal is used as the cereal meal.  
     
     
         12 . A method according to  claim 8 , wherein the content of polymer with vinylamine units is 5 to 30 wt %, with reference to the cereal-meal fraction.  
     
     
         13 . A method according to  claim 8 , wherein a twin-screw extruder is used as the extruder.  
     
     
         14 . A method according to  claim 8 , wherein a completely hydrolysed homopolymer of N-vinyl formamide is used as the polymer with vinylamine units.  
     
     
         15 . A medium according to  claim 1 , wherein cereal meal and/or starch and a polymer with vinylamine units for adjusting the starch content in the paper pulp of a fibre slurry for paper manufacture.  
     
     
         16 . A method of paper manufacture, wherein a medium according to  claim 1  is added to the fibre slurry with the paper pulp.