Manufacturing a papery article

Abstract

The present invention relates to a process for manufacturing papery articles, such as paper, card and board, comprising the pH adjustment of an aqueous composition comprising at least one fiber stock by addition of methanesulfonic acid (MSA).

1 - 12 . (canceled) 
     
     
         13 . A process for manufacturing a papery article comprising the steps of:
 a) providing an aqueous composition comprising at least one fiber stock;   b) adding methanesulfonic acid to the aqueous composition comprising at least one fiber stock to adjust the pH; and   c) draining the aqueous composition comprising at least one fiber stock.   
     
     
         14 . The process according to  claim 13 , wherein the step of draining the aqueous composition (step c) results in the formation of a fibrous web which is pressed and/or dried in one or more further process steps. 
     
     
         15 . The process according to  claim 13 , wherein the fiber stock used is at least one fiber stock selected from the group consisting of sulfate pulp (SA), sulfate semi-pulp, sulfite pulp (SI), groundwood (HS), pressurized groundwood (PGW), refiner mechanical pulp (RMP), thermomechanical pulp (TMP), chemical thermomechanical pulp (CTMP), thermomechanical pulp with caustic/peroxide pretreatment (BCTMP), waste paper (AP) and deinked waste pulp (DIP). 
     
     
         16 . The process according to  claim 13 , wherein the aqueous composition comprises at least one fiber stock which has been alkali-oxidatively bleached. 
     
     
         17 . The process according to  claim 13 , wherein at least one secondary fiber stock is used. 
     
     
         18 . The process according to  claim 13 , wherein the aqueous composition comprising at least one fiber stock has a stock density in the range from 0.01 to 5%. 
     
     
         19 . The process according to  claim 13 , wherein the aqueous composition additionally comprises at least one further additive selected from the group consisting of aluminum sulfate, aluminum nitrate, polyaluminum chloride (PAC), aluminum hydroxide chloride, organic precipitant, biocide, deaerator, defoamer, dispersant, adsorbent, fixative, retention aid, drainage accelerant, dye, optical brightener, internal sizing agent, wet strength agent, dry strength enhancer and internal wet web strength polymer (IWWS). 
     
     
         20 . The process according to  claim 13 , wherein the aqueous composition additionally comprises at least one inorganic filler selected from the group consisting of ground calcium carbonate (GCC), precipitated calcium carbonate (PCC), kaolin, titanium dioxide and barium sulfate. 
     
     
         21 . The process according to  claim 13 , wherein the pH of the aqueous composition comprising at least one fiber stock is adjusted to a value in the range from 4 to 11. 
     
     
         22 . The process according to  claim 13 , wherein the step of adding methanesulfonic acid to the aqueous composition comprising at least one fiber stock takes place in a paper machine approach flow. 
     
     
         23 . The process according to  claim 13 , wherein the papery article is selected from graphic paper, office communication paper, packaging paper, board, card, hygiene paper and specialty paper. 
     
     
         24 . The process according to  claim 13 , wherein the papery article is a packaging material for the food sector.