Igniter tube for a propellant charge

Abstract

An igniter tube consisting of a combustible tube, on the inner face of which an ignition charge is deposited along the length of said combustible tube. The invention also relates to a method for producing the igniter tube.

1 . An igniter tube with a central channel consisting of a combustible tube, made of a combustible material comprising a cellulose ester, on the inner face of which an ignition charge is deposited in the form of geometric patterns spaced apart along the length of said combustible tube, and adheres to said combustible tube, said ignition charge comprising 88 wt % to 92 wt % of ignition powder(s) and 7 wt % to 10 wt % cellulose ester. 
     
     
         2 . The igniter tube according to  claim 1 , wherein the ignition charge further comprises at least one compound chosen from a plasticiser, an additive and a residual solvent. 
     
     
         3 . The igniter tube according to  claim 1 , wherein the ignition powder is a powdered granular material comprising an inorganic oxidant compound. 
     
     
         4 . The igniter tube according to  claim 1 , wherein the ignition powder is gunpowder. 
     
     
         5 . The igniter tube according to  claim 1 , wherein the cellulose ester of the ignition charge is nitrocellulose. 
     
     
         6 . The igniter tube according to  claim 1 , wherein the combustible tube comprises 60 wt % to 80 wt % cellulose ester, 17 wt % to 37 wt % cellulose, 3 wt % to 7 wt % resin and 0 wt % to 2 wt % stabilising additive. 
     
     
         7 . The igniter tube according to  claim 1 , wherein the ignition charge is deposited on the inner face of the combustible tube and along the length thereof, in the form of circular patterns. 
     
     
         8 . The igniter tube according to  claim 1 , wherein the ignition charge is deposited, on the inner face of the combustible tube and along the length thereof, in the form of linear patterns. 
     
     
         9 . The igniter tube according to  claim 1 , wherein the ignition charge is deposited, on the inner face of the combustible tube and along the length thereof, in the form of helical patterns. 
     
     
         10 . A method for preparing an igniter tube according to  claim 1 , which comprises depositing by extrusion a collodion loaded with an ignition powder on the inner face of the combustible tube, and drying the deposited collodion, said collodion loaded with ignition powder comprising 50 wt % to 70 wt % ignition powder and 30 wt % to 50 wt % collodion. 
     
     
         11 . The method according to  claim 10 , wherein the collodion comprises 70 wt % to 90 wt % cellulose ester, 1 wt % to 20 wt % of at least one plasticiser, 0.5 wt % to 5 wt % of at least one stabiliser of the cellulose ester and, optionally, up to 1 wt % of at least one additive. 
     
     
         12 . The method according to  claim 11 , wherein the cellulose ester is nitrocellulose. 
     
     
         13 . A propellant charge comprising an igniter tube according to  claim 1 .