Pyrotechnical, lamellar charge in combustion inhibiting sleeve - is moulded flat and rolled into cylinder fitting projectile

摘要

The cylindrical sleeve of combustion inhibiting resin enclosing a pyrotechnical charge for hte propulsion of a missile or rocket, is produced in a flat mould. The charge is an assembly of relatively thin plates of an explosive based on nitrocellulose and nitroglycerine, arranged lengthways in the combustion chamber of the projectile. The plates are aligned radially to the central axis of the missile, with their outer long edge zones embedded in the combustion inhibiting sleeve, and production is effected in a series of steps. The explosive lamellae are arranged in a frame, parallel to each other, at a predetermined pitch, so that the long edges to be embedded, all lie in the same plane. The assembly of frame and plates is positioned in a mould formed by a shallow tray, the bottom of which delimits the development of the circumference of the sleeve of combustion inhibiting material. The explosive plates are enrobed with the inhibiting resin in the unpolymerised condition up to a determined height above the coplanar edges of the explosive plates, corresp. to the depth to which they are to be embedded in the sleeve. After setting, the layer of combustion inhibitor is ejected from the mould, and the frame and plates are separated. The layer of resin is then rolled into a cylinder with its opposing edges in contact. A pref. additional step involves the laying into the mould of a plate with slots for the explosive plates, and corrugations which produce an additional depth of resin against the sides of the plates. Method dispenses with the need to make a cylindrical core in a mould using a centrifuge, so that a number of operational steps are eliminated.