Composite gun propellant processing technique

C - Chemistry – Metallurgy – 06 – B

Patent

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C06B 21/00 (2006.01) C06B 45/10 (2006.01)

Patent

CA 2179389

A continuous extrusion process for manufacturing composite gun propellant is disclosed. The disclosed process is particularly suitable for preparing gun propellant formulations based upon a cellulose ester binder. In the process, the binder ingredients are dissolved in an organic solvent and then pumped directly into a twin-screw extruder. The other ingredients, except the oxidizer may optionally be dissolved in the organic solvent prior to introduction into the twin-screw extruder. The oxidizer is dried, ground, and also fed dry to the twin-screw extruder. In the extruder, the materials are thoroughly mixed and the solvent is reduced to sufficient level for direct extrusion through the desired dies.

Procédé d'extrusion en continu pour la fabrication de charge propulsive pour canons et en particulier de charges propulsives dont le liant est un ester cellulosique. Dans le procédé, les ingrédients du liant sont dissous dans un solvant organique puis pompés directement dans une extrudeuse à deux vis. Les autres ingrédients, oxydant excepté, peuvent éventuellement être dissous dans le solvant organique avant leur introduction dans l'extrudeuse. L'oxydant est séché, moulu, et également introduit à sec dans l'extrudeuse, dans laquelle les matériaux sont intégralement malaxés et où le solvant est réduit à un niveau suffisant pour permettre l'extrusion directe par les filières voulues.

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