Process for the manufacture of components of dual-composition propellent powder containing nitrocellulose and powder components thus obtained

摘要

Process for the manufacture of components of dual-composition propellent powder containing nitrocellulose, in which the surface composition of the component is different from the composition at the core of the component. According to a preferred embodiment of the invention a component 5 made from a first propellent composition is wound onto a feed reel 4. This component 5 is caused to pass through a coating device 6 to be coated with a coating composition before moving into a sheathing enclosure 3. A second propellent composition placed in an extruder 1 fills the sheathing enclosure 3 where it is applied at an adjustable thickness around the component 5, which emerges in the form of a dual-composition component 7. The linear burning speed of the first composition is preferably higher than the linear burning speed of the second composition. The invention also relates to the dual-composition powder components thus obtained. <IMAGE>