Cartridge for Ammunition

Abstract

A single ply barrier foil is provided between the propellant in the cartridge casing and the pyrotechnic composition in the primer to prevent nitroglycerin migration from the propellant into the pyrotechnic composition. The single ply barrier foil is formed of ethyl cellulose and a plasticizer and has a thickness of 190 um±10 um.

What is claimed is: 
     
         1 . A cartridge comprising
 a casing;   a double-base propellant disposed in said casing, said propellant having nitroglycerin therein;   a primer disposed at one end of said casing and including a pyrotechnic composition; and   a single ply barrier foil disposed between said propellant and said pyrotechnic composition to prevent nitroglycerin migration from said propellant into said pyrotechnic composition.   
     
     
         2 . A cartridge as set forth in  claim 1  wherein said pyrotechnic composition is of a potassium chlorate type containing lead sulfocyanide and trinitrotoluene and said propellant is a powder. 
     
     
         3 . A cartridge as set forth in  claim 1  wherein said single ply barrier foil is formed of cellulose. 
     
     
         4 . A cartridge as set forth in  claim 1  wherein said single ply barrier foil is formed of ethyl cellulose and a plasticizer. 
     
     
         5 . A cartridge as set forth in  claim 1  wherein said single ply barrier has a thickness of 190 um±10 um. 
     
     
         6 . A cartridge as set forth in  claim 1  wherein said casing is sized for a 20 millimeter ammunition cartridge.