Explosives having powdered ferrite magnet as a tracer dispersed therethrough and a method for producing the same
AssigneeTohoku Metal Industries, Ltd.
InventorsNaozumi Nishimura, Akira Matsunaga, Yasuo Ishii
Life of this patent
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Abstract
An explosive having a relatively small amount of powdered ferrite magnet dispersed therethrough, each magnet particle coated with a resin coating which is stable for the explosive material on the entire outer surface thereof. The resultant explosive is readily detected by a magnetic detector and is stable for a long time storage. As the resin coating, methyl methacrylate resin, styrene resin, acrylonitril resin, butadiene resin, vinyl acetate resin, acrylic acid resin, methylacrylate resin and/or the other vinyl resin is used. The resin coating is colored to color the explosives so that explosives may be distinctly visible, readily detected and identified.
Claims14
In an explosive having a relatively small amount of powdered ferrite magnet dispersed therethrough, the improvement comprising each particle of said powdered ferrite magnet coated with a resin coating which is stable for the explosive materials on the entire outer surface of each particle.
A powdered ferrite material which is used for a tracer mixed in an explosive comprising each ferrite magnet particle coated with a resin coating which is stable on the explosive material on the entire outer surface thereof.
An explosive having a relatively small amount of powdered ferrite material dispersed therethrough, each particle of said powdered ferrite material coted with a resin coating which is stable on the explosive material on the entire outer surface of each particle.
A method for producing an explosive having powdered ferrite magnet dispersed therethrough comprising:
- preparing a ferrite powder and explosive material separately;
- subjecting said ferrite powder to a coating treatment with a resin which is stable for the explosive material;
- mixing said resin coated ferrite powder with said explosive material and kneading said mixture by a kneader;
- forming a body having a desired shaped and wrapping said body by a wrapping paper to form an explosive cartridge;
- and
- loading said explosive cartridge in a magnetizing machine to magnetize said ferrite powder mixed in the explosive.
Dependencies are inferred from the claim text.