Film-type ignition element and method for producing same

Abstract

The invention relates to a film-type ignition element, used in particular for igniting the propellant charge of large-caliber ammunition. The invention furthermore relates to a method for producing an ignition element of this type. To ensure that the ignition element can be produced easily and cheaply even with high reproducibility, it is proposed according to the invention that essentially only black powder, nitrocellulose and a plasticizer as binding agent are used for the material, wherein the share of black powder>60 weight % and preferably 63 to 85.5 weight %, the share of nitrocellulose<10 weight % and preferably 2.8 to 7 weight % and the share of the binding agent is ≧5 weight %, preferably 5.0 to 30 weight %.

What is claimed is:  
     
         1 . A film-type ignition element, for igniting the propellant charge of large-caliber ammunition, wherein the ignition element comprises more than 60 weight % black powder, less than 10 weight % nitrocellulose and at least 5 weight % of a plasticizer in the form of a binding agent.  
     
     
         2 . The film-type ignition element according to  claim 1 , wherein the black powder ranges between 63 and 85.5 weight %; the nitrocellulose ranges between 2.8 and 7 weight % and the binding agent ranges between 5 and 30 weight %.  
     
     
         3 . The film-type ignition element according to  claim 1 , wherein the binding agent is bis(2-ethyl)-phthalat, dimethyl-phthalat, Edenol B 33 or butyl-NENA.  
     
     
         4 . The film-type ignition element of  claim 1 , wherein the ignition element has a wall thickness ranging between 0.3 and 2.0 mm.  
     
     
         5 . The film-type ignition element according to  claim 4 , wherein the wall thickness of the ignition element is between 1 and 1.5 mm.  
     
     
         6 . The film-type ignition element according to  claim 1 , wherein the ignition element has a net-type structure.  
     
     
         7 . The film-type ignition element according to  claim 1 , wherein the ignition element is a finished molded part with radially inward-pointing ribs.  
     
     
         8 . A method for producing an ignition element according to  claim 1 , providing a composition comprising 63 to 85.5 weight % of black powder, 2.8 to 7 weight % nitrocellulose and 5 to 30 weight % of a binding agent and admixing said composition with approximately 70 weight % of a solvent to form a mixture; subsequently stirring said mixture until a uniform, viscous mass results; and processing said mass into a film or a shaped body.  
     
     
         9 . The method according to  claim 8 , wherein a mixture of 20 weight % methanol and 50 weight % acetone is used as solvent, wherein the weight percentage value is based on the total weight for black powder, nitrocellulose and binding agent used.  
     
     
         10 . An ignition element of  claim 1 , in the form of a flexible film.  
     
     
         11 . The ignition element of  claim 1 , which is in the form of a net.  
     
     
         12 . The ignition element of  claim 1 , in the form of a molded part comprising radially inward pointing ribs.