Dyed or tinted paper and method of making same

Abstract

A paper stock with at least one side dyed or tinted such that each side has a different color or shade to provide an indication of any erasures on the dyed or tinted side of the paper. Machinery and systems are disclosed for practicing the method of making the inventive paper.

What is claimed is:  
     
         1 . A paper stock having at least one side dyed or tinted such that each side has a different color or shade to provide an indication of any erasures on the dyed or tinted side of the paper.  
     
     
         2 . The paper stock of  claim 1 , wherein the paper stock has a wire side and a felt side with the felt side dyed or tinted a darker shade or color than the wire side.  
     
     
         3 . The paper stock of  claim 2 , wherein only the felt side is dyed or tinted with a color other than white and the wire side is white.  
     
     
         4 . The paper stock of  claim 3 , wherein the felt side of the dyed paper stock is blue or pink or green.  
     
     
         5 . The paper stock of  claim 4 , wherein the dye includes a blue dye and a methyl violet dye.  
     
     
         6 . The paper stock of  claim 5 , wherein the dyes are water soluble.  
     
     
         7 . The paper stock of  claim 1 , wherein the paper stock is bond and one side is dyed or tinted and the other side is white.  
     
     
         8 . The paper stock of  claim 7 , wherein the moisture content of the dyed or tinted paper stock is between about 4% and about 5% by weight.  
     
     
         9 . The paper stock of  claim 5 , and further including an anti-curl composition on the wire side.  
     
     
         10 . The paper stock of  claim 9 , wherein the anti-curl composition is a glycol.  
     
     
         11 . The paper stock of  claim 1 , having indicia on one side which if erased substantially removes the dye or tint on the one side thereof.  
     
     
         12 . The paper stock of  claim 1  in a large format roll.  
     
     
         13 . The paper stock of  claim 1  in large format sheets.  
     
     
         14 . A bond paper stock having a dyed or tinted felt side and a wire side having a different color or shade than the felt side, 
 an anti-curl composition at least on the wire side, and    indicia on at least the dyed or tinted felt side of the paper, wherein erasures of the indicia on the dyed or tinted felt side produces an indication of the erasure.    
     
     
         15 . The bond paper stock of  claim 14 , wherein only the felt side is dyed or tinted with a color other than white.  
     
     
         16 . The bond paper stock of  claim 15 , wherein the dye includes a blue dye and a methyl violet dye.  
     
     
         17 . The bond paper stock of  claim 16 , wherein the anti-curl composition includes an ethylene glycol.  
     
     
         18 . A method of manufacturing a paper stock, comprising 
 passing a large format paper web through color station in which a dye or tint is added to at least one side, drying the dyed or tinted paper web to produce a large format paper stock having a dyed or tinted side of different color or shade than the other side.    
     
     
         19 . The method of  claim 18 , wherein one side of the web is dyed blue and the other side of the web is undyed or tinted and is white.  
     
     
         20 . The method of  claim 19 , wherein the dye added is a combination of blue dye and methyl violet, the paper is bond and further comprising the step of applying an anti-curl agent to the undyed or tinted side of the web.