Board, packaging material and package as well as production and uses thereof

Abstract

The invention relates to a process for producing board which comprises providing an aqueous suspension comprising cellulosic fibres; adding hydrotalcite to the suspension; dewatering the obtained suspension to provide a (i) single ply board. The invention further relates to board comprising one or more plies containing cellulosic fibres, wherein the board further comprises hydrotalcite distributed throughout at least one of said one or more plies.

1 . A process for producing board which comprises 
 (i) providing an aqueous suspension comprising cellulosic fibres;    (ii) adding hydrotalcite to the suspension;    (iii) dewatering the obtained suspension to provide a single ply board.    
   
   
       2 . The process of  claim 1 , further comprising attaching said ply to one or more plies comprising cellulosic fibres to provide a multi ply board comprising two or more plies.  
   
   
       3 . The process of  claim 1 , further comprising adding a cationic polymer to the suspension.  
   
   
       4 . The process of  claim 1 , further comprising adding a siliceous material to the suspension.  
   
   
       5 . The process of  claim 1 , further comprising adding a sizing agent to the suspension.  
   
   
       6 . The process of  claim 1 , wherein the hydrotalcite has a 3R 1  stacking.  
   
   
       7 . The process of  claim 1 , wherein the hydrotalcite has a 3R 2  stacking.  
   
   
       8 . The process of  claim 2 , wherein the hydrotalcite has a 3R 2  stacking.  
   
   
       9 . A board comprising one or more plies containing cellulosic fibres, wherein the board further comprises hydrotalcite distributed throughout at least one of said one or more plies.  
   
   
       10 . The board of  claim 9 , wherein the board comprises two or more plies containing cellulosic fibres.  
   
   
       11 . The board of  claim 10 , wherein the board comprises from three to seven plies containing cellulosic fibres.  
   
   
       12 . The board of  claim 11 , wherein hydrotalcite is comprised in at least one outer ply of the board.  
   
   
       13 . The board of  claim 9 , wherein the hydrotalcite has a 3R 1  stacking.  
   
   
       14 . The board of  claim 9 , wherein the hydrotalcite has a 3R 2  stacking.  
   
   
       15 . The board of  claim 10 , wherein the hydrotalcite has a 3R 2  stacking.  
   
   
       16 . The board of  claim 9 , wherein the board has a grammage of at least 130 g/m 2 .  
   
   
       17 . The board of  claim 9 , wherein the board has a grammage of from 150 to 450 g/m 2 .  
   
   
       18 . The board of  claim 9 , wherein the board has a bulk density of 200 to 600 kg/m 3 .  
   
   
       19 . The board of  claim 9 , wherein the hydrotalcite is substantially uniformly distributed throughout at least one ply of the board.  
   
   
       20 . The board of  claim 9 , wherein the board comprises at least 50% by weight of cellulosic fibres.