| 摘要 |
PROBLEM TO BE SOLVED: To provide an ammonium nitrate oil explosive cartridge capable of showing markedly improved strength compared to conventional ammonium nitrate oil explosive cartridges while retaining conventional sympathetic detonation performance and initiation sensitivity (insensitivity). SOLUTION: The ammonium nitrate oil explosive cartridge is obtained by packing ammonium nitrate oil explosive comprising porous prilled ammonium nitrate with a hardness of 0.1-3% and oil in a cartridge. The hardness of the prilled ammonium nitrate is determined by a test method (described on page 4 of Newsletter issued by Japan Industrial Explosive Association on July 15, 1965) comprising steps of: screening a sample through 10-14 meshes, collecting 50 g of the sample (W<SB>1</SB>) on a plate and spreading it over the entire plate; placing a milling plate over the sample and lightly gripping a handle so as to rotate the plate five times in 10 sec; and taking out the sample, screening it through a 14 mesh and collecting and weighing the ground product (W<SB>2</SB>) that has passed through the 14 mesh. The hardness is calculated by the formula: hardness=W<SB>2</SB>/W<SB>1</SB>×100(%), provided that accuracy in weighing W<SB>1</SB>is 500 g=0.5. COPYRIGHT: (C)2009,JPO&INPIT |
