Ignition unit i.e. two-stage ignition unit, for mechanical ignition of nitrocellulose, has two ignition-lighting units accommodated in housing, and outlet holes distributed along periphery of housing

摘要

The ignition unit (4) has two ignition-lighting units accommodated in a housing. A supporting tube is provided within a numerical control-block for secured positioning of an igniting mixture, where the numerical control block is made from paperboard. The igniting mixture comprises 0.2 grams of ignition powder consisting of 50% zirconium hydride or 50% ferric oxide. Outlet holes (9) are distributed along a periphery of the housing to dissipate developing gases and prevent a rocket effect. A flexible rubber sealing (8) seals the holes.