CS200926B1 - Method of packing the electric detonators and initiators - Google Patents

Description

Method of packing electric detonators and initiators

Electric detonators and initiators consist of the actual detonator or initiator, provided with a pair of insulated electrical conductors on which an electric igniter is mounted, located in a plug which is constricted with the metal tube of the actual detonator or initiator. For shipping and transportation, the electrical wires are twisted into loops, the detonator itself is located outside the loop. Individual electric detonators are usually bundled into bundles of 10 pieces each, and these bundles into larger bundles, which usually contain 100 kua. In the harness, the electric detonators are tied by dragging the wire over the loops of the electrical conductors, the detonators themselves remain free. The bundle thus prepared is usually packed in paper and placed in wooden or sheet metal containers, possibly with double walls. For overseas packaging, the packaging is lined with paraffin paper. Electric detonators and initiators designed for military use are usually packed in small quantities of 10 to 25 pieces - in cardboard boxes, each detonator being protected by a wrapping of crepe paper. The cardboard box is then covered with a paper wrapping, the wrapping is protected against external moisture by immersion in a paraffin bath. The individual boxes are then folded into wooden shipping containers.

The method of packaging has a number of disadvantages: in bundles, the detonators themselves are not protected from impact and thus unwanted initiation, nor are they protected from the atmosphere. Packaging detonators and initiators requires a lot of manual work.

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The main disadvantage, however, is the possibility of electric charge. The detonator wires actually form an antenna, so they can be initiated by electric discharges in the atmosphere (lightning) or by strong emitters - eg radars.

In unprotected bundles, detonators can also be initiated by static electricity or stray currents.

These disadvantages of the present packaging method are eliminated by the packaging method, the principle of which is that the electric detonators and initiators are packed into banded smaller bundles with their own detonators in the middle between the conductor loops and wrapping the bundles so formed with an aluminum foil with plastic coating. by pressure or heat or by the combined action of pressure and heat sealed around a detonator or initiator beam.

The described packaging method is easy to mechanize, thus reducing manual work, placing the detonators between the loop wires protects the detonators from impact and mechanical damage, hermetic packaging protects them from the effects of the outside atmosphere and using a metal foil wrap creates Paraday cage to protect electric detonators by electric charge. The packed electric detonators and initiators occupy less space by a more perfect composition.

Exemplary embodiment: five loops of electrical conductors with detonators attached are folded so that the actual detonators are bent over the top of the loops by bending the conductors, this layer being covered by the second five conductor bundles, the detonators being located between the first and second conductor layers. The whole is stretched by metal strips at both ends into a prism shape. A polyethylene - aluminum - cellophane foil is wrapped around the prism and the foil is wrapped with polyethylene backing at the same time by pressure and heat. After the longitudinal weld has been formed, the bundle is closed by transverse welds, the film being cut at the same time.

Claims (1)

SUBJECT OF THE INVENTION Method of packaging electric detonators and initiators, characterized in that the detonators or initiators are inserted between the wires of electric conductors, the bundle is withdrawn and provided with a closed aluminum foil wrapper coated with a thermoplastic material.