Patent ID: 7712418
Filing Date: 2010-05-11
Classification: F42B

Abstract:
1. A method of manufacturing a cartridge, said cartridge comprising a rigid base, an envelope having an opening at a launching end, a closure wad at the launching end of the envelope, and a closure cap disposed adjacent said closure wad, said closure cap having a side wall, a bottom and an opening, said side wall extending from said bottom, said bottom and said side wall forming a tube having said bottom at one end and said opening of the closure cap at the other end opposite said bottom, the method comprising the steps of: placing the closure cap at a launching end of the envelope such that (i) the side wall of the closure cap is inside and touching the wall of the launching end of the envelope, (ii) the opening of the closure cap and the opening of the envelope are parallel, and (iii) the bottom of the closure cap is more interior within the envelope than the opening of the closure cap; and simultaneously crimping the side wall of the closure cap and the wall of the launching end of the envelope such that a substantially impermeable seal is formed at the launching end of the envelope of the cartridge.