Use of cyclodextrins for reducing deposits during paper production

Abstract

The present invention relates to a method for preventing or reducing deposits in pulp and paper making processes by including a cyclodextrin during or after pulp formation in an amount effective for preventing or reducing the deposits. Optionally the cyclodextrin comprising the deposit is subsequently separated from the pulp.

1 . A method of preventing or reducing deposits in a pulp and paper making process by treating a pulp with a cyclodextrin in an amount effective for preventing or reducing the deposits.  
   
   
       2 . The method according to  claim 1 , wherein the cyclodextrin forms a solid inclusion complex with the deposit and wherein said complex is subsequently separated from the pulp.  
   
   
       3 . The method according to  claim 1 , wherein a source of raw fiber material for pulp formation is provided from printed paper.  
   
   
       4 . The method according to  claim 3 , wherein the printed paper comprises old newspapers (ONP) and/or waste magazines (WM).  
   
   
       5 . The method according to  claim 1 , wherein the deposits comprise fatty acid or ester deposits on process equipment.  
   
   
       6 . The method according to  claim 1 , wherein the deposits comprise stickies.  
   
   
       7 . The method according to  claim 3 , wherein the deposits comprise ink deposits on pulp fibers.  
   
   
       8 . The method according to  claim 7 , wherein the ink deposits comprise non-contact laser inks, xerographic toners, letterpress ink generally used in printing newsprint, magazine print, offset printing ink, ultraviolet or electron beam cured ink.  
   
   
       9 . The method according to  claim 1 , wherein the cyclodextrin comprises alpha-, beta- and/or gamma-cyclodextrin.  
   
   
       10 . The method according to  claim 9 , wherein the cyclodextrin is alpha- or beta-cyclodextrin.  
   
   
       11 . The method according to  claim 1 , wherein the cyclodextrin is provided partly or completely by enzymatic conversion of starch in situ.  
   
   
       12 . The method according to  claim 11 , wherein the enzyme comprises a glycosyltransferase.  
   
   
       13 . The method according to  claim 12 , wherein the glycosyltransferase comprises a CGTase.  
   
   
       14 . The method according to  claim 1 , wherein cyclodextrin treatment is combined with enzymatic treatment and wherein the enzyme is chosen from the group consisting of proteases, amylases, pullulanases, lipases, hemicellulases, endoglucanases, cutinases, and pectinases.