CHUB BLASTING CARTRIDGE WITH INTEGRAL CORD THREADING TUNNEL

摘要

A blasting cartridge (1) has a tubular chamber (4) containing a water-bearing blasting agent, and a longitudinal tunnel (6) adjacent to the tubular chamber (4) and integral therewith. Preferably, the tunnel (6) is full-length and continuous and has holes (11) for threading a detonating cord (17) therethrough and for holding the cord firmly against the tubular chamber (4) for the cord-priming of the cartridges. In primer assemblies, the tunnel (6) also can be used to hold a cap or booster (12) in place, and for lacing cap wires (13) or a low-energy detonating cord. A preferred cartridge is made continuously in a series by wrapping a web of film having a row of holes along one edge so as to form a tube and an outer flap containing the holes, and sealing the tube and the flap so as to form a tunnel containing the holes in its outer portion, the wrapping being performed so that either the inner or outer portion of the tunnel is circumferentially longer than the other.