F - Mech Eng,Light,Heat,Weapons – 42 – B
Patent
F - Mech Eng,Light,Heat,Weapons
42
B
26/111, 102/28,
F42B 27/00 (2006.01) B29C 41/04 (2006.01) F42B 12/32 (2006.01)
Patent
CA 1142029
1141 INVENTORS: SWAN LIEP SIE LARS RINGDAL INVENTION: METHOD OF PRODUCING FRAGMENTABLE CASINGS AND PRODUCT OBTAINED ABSTRACT A method of producing plastic-based casings includ- ing preformed metal fragments for ordnance articles, such as hand grenades, weapon-launched grenades or the like, by rotational molding in a shell-mold; a pulverulent thermoplastic polymer mat- erial, such as polyethylene, and steel fragments or particles are introduced into the cold shell mold, optionally in the form of a pre-compact; the closed mold is rotated slowly, i.e. at a speed where the polymer and metal constituents tend to tumble about the inner mold surface and are not held substantially thereon by centr- ifugal effects; while continuously rotating the shell mold about two or more axes of rotation, the mold is heated by an externally applied hot fluid such as hot gas. As the temperature of the wall of the mold increases, an adhering layer of viscous polymer is formed thereon while the metal fragments continue to tumble; only when most of the polymer material is in a viscous molten state and has formed a layer covering the inner surface of the mold, the metal particles will adhere to the viscous material layer and form a metal particle monolayer thereon; then, the mold is cooled while still in rotation until the polymer solidifies. Finally, the mold- ed product is discharged from the shell and provides an integral casing substantially consisting of an outer wall of polymer materi- al and a monolayer of metal fragments adhering thereto. Molecular cross-linking of the polymer may be effected by a cross-linking agent and activating the latter after formation of the monolayer.
341295
Ringdal Lars
Sie Swan L.
Eurometaal N.v.
Ridout & Maybee Llp
Sinterplast Establishment
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