Combustible charges adhering to the inner wall of a combustible structure containing a propellant charge

Abstract

An ammunition containing, in a combustible structure based on a cellulose, a propellant charge of powder grains and an ignition device, in which in the ammunition at least one combustible charge based on is deposited in the form of a solid geometric volume pattern adhering to the inner wall of the combustible, cellulose ester-based structure.

1 . Ammunition containing, in a cellulose ester-based combustible structure, a propellant charge of powder grains and an ignition device, in which ammunition at least one cellulose ester-based combustible charge is deposited in the form of a solid geometric volume pattern adhering to the inner wall of the cellulose ester-based combustible structure. 
     
     
         2 . Ammunition according to  claim 1 , wherein the combustible charge comprises from 88% to 92% by weight of ignition powder(s) and from 7% to 10% by weight of cellulose ester. 
     
     
         3 . Ammunition according to  claim 1 , wherein the combustible charge comprises at least one functional additive selected from the group consisting of an anti-glow additive, an anti-erosion additive and an anti-copper additive. 
     
     
         4 . Ammunition according to  claim 3 , wherein the combustible charge comprises 70.3% to 92% by weight of functional additive(s), 0% to 17.6% of a combustible charge and 7% to 10% by weight of cellulose ester. 
     
     
         5 . Ammunition according to  claim 1 , wherein the combustible charge further comprises at least one energetic charge. 
     
     
         6 . Ammunition according to  claim 5 , wherein the combustible charge comprises from 88% to 92% by weight of at least one energetic charge and from 7% to 10% by weight of cellulose ester. 
     
     
         7 . Ammunition according to  claim 2 , wherein the at least one combustible charge deposited in the form of a solid geometric volume pattern is coupled with the ignition device. 
     
     
         8 . Ammunition according to  claim 3 , wherein the at least one combustible charge deposited in the form of a solid geometric volume pattern is not coupled with the ignition device. 
     
     
         9 . Ammunition according to  claim 1 , which is of the arrow shell or explosive shell type. 
     
     
         10 . Ammunition according to  claim 9 , in which the combustible structure is a case and comprises a connecting part separately supporting patterns of the at least one combustible charge, the patterns of the case and the connecting part being joined after assembly of the ammunition. 
     
     
         11 . Ammunition according to  claim 1 , wherein the geometric volume pattern is a linear, helical, curvilinear pattern, or a pattern of shapes combined so as to obtain a mesh. 
     
     
         12 . A process for preparing an ammunition combustible structure, the combustible structure being based on cellulose ester and comprising at least one combustible charge based on cellulose ester deposited in the form of a solid geometric volume pattern adhering to its inner wall, which process comprises depositing by extrusion a paste consisting of a collodion loaded with an ignition powder, or with at least one functional additive or with at least one energetic charge, on the inner face of the combustible structure, and drying the deposited paste, the loaded collodion comprising from 30% to 50% by weight of collodion and the balance to 100% of ignition powder or of at least one functional additive or of at least one energetic charge. 
     
     
         13 . The process according to  claim 12 , wherein the collodion comprises a cellulose ester base, the cellulose ester base comprising 70% to 90% by weight of cellulose ester, 1% to 20% by weight of at least one plasticizer, and 0.5% to 5% by weight of at least one cellulose ester stabilizer. 
     
     
         14 . The process according to  claim 13 , wherein the cellulose ester is nitrocellulose.