Drawn wall iron can for light colored fruits

Abstract

A method of making packaging for light colored fruits includes steps of providing a base material having a steel substrate, a first layer of tin material on a first side of the substrate and a second layer of tin material on a second side of said substrate, forming the base material into a can body for a DWI can having a bottom surface and a sidewall comprising an exterior surface that has a first coating including tin and an interior surface having a second coating also including tin, inserting foodstuffs into the can body so that the foodstuffs are exposed to the tin surface, and applying a top end to the can body.

1 . A method of making packaging for light colored fruits comprising steps of: 
 (a) providing a base material having a steel substrate, a first layer of tin material on a first side of said substrate and a second layer of tin material when a second side of said substrate, with no additional protective coating on said second layer;    (b) using the drawn wall ironing process to form said base material into a can body for a DWI can having a bottom surface and a sidewall comprising an exterior surface corresponding to said second layer that has a first coating comprising tin and an interior surface corresponding to said first layer having a second coating also comprising tin that is thicker than said first exterior coating;    (c) inserting foodstuffs into the can body so that said foodstuffs are exposed to said tin surface; and    (d) applying a top end to the can body.    
   
   
       2 . A method according to  claim 2 , wherein said second coating has a mass per unit area that is at least 0.15 pounds of tin per base box.  
   
   
       3 . A method according to  claim 2 , wherein said second coating has a mass per unit area that is at least 0.20 pounds of tin per base box.  
   
   
       4 . A method according to  claim 3 , wherein said second coating has a mass per unit area that is at least 0.25 pounds of tin per base box.  
   
   
       5 . A method according to  claim 1 , wherein said first layer has a mass per unit area that is at least 0.50 pounds of tin per base box.  
   
   
       6 . A method according to  claim 1 , wherein said first layer has a mass per unit area that is at least 0.60 pounds of tin per base box.  
   
   
       7 . A method according to  claim 1 , wherein said first layer has a mass per unit area that is at least 0.675 pounds of tin per base box.  
   
   
       8 . A method according to  claim 1 , wherein said second layer has a mass per unit area that is at least 0.10 pounds of tin per base box.  
   
   
       9 . A method according to  claim 1 , wherein said second layer has a mass per unit area that is at least 0.125 pounds of tin per base box.  
   
   
       10 . A method according to  claim 1 , wherein said second layer has a mass per unit area that is at least 0.15 pounds of tin per base box.  
   
   
       11 . A method according to  claim 1 , wherein said first layer has a mass per unit area that is at least 100 pounds of tin per base box.  
   
   
       12 . A method according to  claim 11 , wherein said first layer has a mass per unit area that is at least 120 pounds of tin per base box.  
   
   
       13 . A method according to  claim 12  wherein said first layer has a mass per unit area that is at least 135 pounds of tin per base box.  
   
   
       14 . A method according to  claim 11 , wherein said second layer has a mass per unit area that is at least 20 pounds of tin per base box.  
   
   
       15 . A method according to  claim 14 , wherein said second has a mass per unit area that is at least 25 pounds of tin per base box.  
   
   
       16 . A method according to  claim 15 , wherein said second layer has a mass per unit area that is at least 30 pounds of tin per base box.  
   
   
       17 . A method according to  claim 1 , wherein said first layer has a greater mass per unit area than said second layer.  
   
   
       18 . A method according to  claim 1 , wherein said first layer is thicker than said second layer.