Method for the fabrication of a fiber web

Abstract

A method for the fabrication of a fibrous web including the steps of loading fibers with a precipitant, thereby defining treated fibers. Creating at least a portion of the precipitant as crystalline precipitant particles. Supplying the treated fibers as a pumpable fiber stock suspension to a sheet forming process that forms the fibrous web. And, controlling filler distribution across a web cross section of the fibrous web by way of a vacuum supply in the sheet forming process.

1 . A method for the fabrication of a fibrous web, comprising the steps of: 
 loading fibers with a precipitant, thereby defining treated fibers;    creating at least a portion of said precipitant as crystalline precipitant particles;    supplying said treated fibers as a pumpable fiber stock suspension to a sheet forming process that forms the fibrous web; and    one of controlling and regulating filler distribution across a web cross section of the fibrous web by way of a vacuum supply in said sheet forming process.    
     
     
         2 . The method of  claim 1 , wherein said crystalline precipitant particles have a size in a range of approximately 0.05 μm to 0.5 μm.  
     
     
         3 . The method of  claim 1 , wherein said crystalline precipitant particles have a size in a range of approximately 0.1 μm to 2.5 μm.  
     
     
         4 . The method of  claim 1 , wherein said crystalline precipitant particles have a size in a range of approximately 0.3 μm to 0.8 μm.  
     
     
         5 . The method of  claim 1 , wherein said crystalline precipitant particles have a size in a range of approximately 0.05 μm to 0.1 μm.  
     
     
         6 . The method of  claim 1 , wherein said crystalline precipitant particles are calcium carbonate.  
     
     
         7 . The method of  claim 1 , further comprising the steps of: 
 adding at least one of calcium oxide and calcium hydroxide for loading said fibers with calcium carbonate; and    treating said fiber stock suspension with carbon dioxide, thereby triggering a precipitation of said particles.    
     
     
         8 . The method of  claim 7 , wherein said calcium hydroxide is in a liquid form.  
     
     
         9 . The method of  claim 8 , wherein said calcium hydroxide is in a dry form.  
     
     
         10 . The method of  claim 1 , wherein the fibrous web is newsprint.  
     
     
         11 . The method of  claim 1 , wherein the fibrous web is a SCA paper.  
     
     
         12 . The method of  claim 1 , wherein the fibrous web is a LWC coated paper.  
     
     
         13 . The method of  claim 1 , wherein the fibrous web is a ULWC paper.  
     
     
         14 . The method of  claim 1 , wherein the fibrous web is a wood-free non-coated paper.  
     
     
         15 . The method of  claim 1 , wherein the fibrous web is a wood-free coated paper.  
     
     
         16 . The method of  claim 1 , wherein the fibrous web is a white lined Liner.  
     
     
         17 . The method of  claim 1 , wherein the fibrous web is bleached types of cardboard.