Paper product and method of making

Abstract

Paper having improved curl and cockle properties for water based, ink jet printing applications and a method of producing them. The paper contains at least 50 pounds per ton of a mono alkali metal salt of citric acid. The paper has a maximum Cockle Value of 0.25. It also contain a hexasulfonated optical brightener. The paper is also water fast and can be preprinted with offset printing inks. A method for making the paper.

1 . A method of manufacturing uncoated printing paper comprising 
 forming a wet web of cellulosic fibers,    applying to the web at least 50 pounds of a mono alkali metal salt of citric acid per ton of paper,    applying-to the web hexasulfonate optical brightener,    drying the web to provide an uncoated paper having water fastness.    
     
     
         2 . The method of  claim 1  wherein the salt of citric acid is mono sodium citrate.  
     
     
         3 . The method of  claim 1  wherein the salt of citric acid is mono potassium citrate.  
     
     
         4 . The method of  claim 1  further comprising applying to the web prior to drying a starch, ethylated starch or polyvinyl alcohol.  
     
     
         5 . The method of  claim 4  wherein the salt of citric acid is mono sodium citrate.  
     
     
         6 . The method of  claim 4  wherein the salt of citric acid is mono potassium citrate.