초록 ▼

An improved low-energy detonating cord, which is light-weight, flexible, strong, and non-conductive, detonates at high velocity, and is readily adapted to high-speed continuous manufacturing techniques, has a continuous solid core of a deformable bonded detonating explosive composition comprising a

An improved low-energy detonating cord, which is light-weight, flexible, strong, and non-conductive, detonates at high velocity, and is readily adapted to high-speed continuous manufacturing techniques, has a continuous solid core of a deformable bonded detonating explosive composition comprising a crystalline high explosive compound, preferably superfine PETN, admixed with a binding agent, the crystalline explosive loading being about from 0.5 to 10 grains per foot (0.1 to 2 grams per meter) of length; and, enclosing the core, a protective plastic sheath, e.g., about 0.005-0.075 inch (0.127-1.905 mm) thick, no metal or woven textile layers being present around the core or sheath. Preferably, one or more continuous strands of reinforcing yarn, e.g., running substantially parallel to the core\s longitudinal axis, are located between the core and the plastic sheath, or in or around the sheath. A preferred cord can be made by drawing strands of yarn under tension in the form of a moving cage of substantially parallel strands, allowing the moving cage to entrain a bonded explosive core within it and thereby form a conveyor for the core, and applying a layer of plastic material around the cage while effecting substantially no change in the diameter of the explosive core after its entrainment within the cage.

대표청구항 ▼

A low-energy detonating cord adapted for use as a trunkline and/or a downline cord in a non-electric blasting assembly and comprising (a) an axial continuous solid core of a deformable bonded detonating explosive composition comprising at least about 55 percent by weight of a cap-sensitive crystalli

A low-energy detonating cord adapted for use as a trunkline and/or a downline cord in a non-electric blasting assembly and comprising (a) an axial continuous solid core of a deformable bonded detonating explosive composition comprising at least about 55 percent by weight of a cap-sensitive crystalline high explosive compound selected from the group consisting of organic polynitrates and polynitramines admixed with a binding agent, the particles of crystalline high explosive compound in said composition having their maximum dimension in the range of about from 0.1 to 50 microns, and the diameter and the explosive content of said core being such as to provide about from 0.1 to 2 grams of crystalline high explosive compound per meter of length of said cord; (b) surrounding said axial explosive core, protective sheathing consisting solely of one or more layers of plastic material, the plastic material being one which is capable of flowing at a temperature not exceeding the melting point of said crystalline high explosive compound by more than about 75°C.; and (c) core-reinforcement means outside said core adapted to provide said cord with a tensile strength of at least about 9 kilograms comprising at least one continuous strand of yarn running substantially parallel to said core\s longitudinal axis.