Propellant extrusion using shaped perforation pins

Details Propellant extrusion using shaped perforation pins Propellant extrusion using shaped perforation pins

F - Mech Eng,Light,Heat,Weapons

42

B

F42B 1/00 (2006.01) C06B 45/12 (2006.01)

Patent

CA 2495495

An extruded stick-type propellant grain is disclosed that includes a length separated from a strand of extruded propellant material having a predetermined cross-sectional shape provided with a predetermined number of spaced, radially distributed, hollow non-round longitudinal perforations formed in said length of propellant material parallel to and extending along the length thereof and separated and surrounded by a web of the propellant material. The perforations have a geometric cross section selected from the group consisting of non-round shapes that enhance uniformity in unburned web thickness during a normal burn of said length of extruded propellant thereby reducing the amount of unburned slivers. A central perforation is also provided.

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