Cord, igniter

If the outer covers of safety fuse are pierced, e.g. by falling rock, water can penetrate and stop the combustion of the fuse. Much work has been done in efforts to obtain a waterproof fuse which will obviate this difficulty. This work, although not successful in its original purpose, has led to the development of igniter cord which has proved of considerable value in secondary blasting (see p. 148). Two types of igniter cord are manufactured, fast cord with a burning speed of 3 s m1 and slow cord with a speed of 30 s m-1. 

The speed of burning of fast igniter cord depends on the speed of burning of the blackpowder-coated yarns and this depends in turn on the gas channels left in the construction of the fuse. The remainder of the fuse is also combustible, so that there is no pressure build up due to lack of venting. Should a minor pin hole or break in the outside layers be produced and water enter, the incendiary composition will continue to burn so that the fuse will not fail, although it will slow down for the distance of the damage. 

Slow igniter cord consists of the same type of plastic incendiary composition extruded not over combustible blackpowder-coated yarns,... 

Igniter cord. A cord for igniting safety fuse. 

Plastic Igniter Cord (PIC) is a modern version of quickmatch in which the gunpowder is replaced by a delay composition, consisting essentially of lead dioxide and silicon, while the support material is aluminium or iron wire. A plastic tube encloses the fuse, as in the manner of electrical... 

The rate of burning of plastic igniter cord is primarily governed by the chemical composition of the pyrotechnic and the rate of heat transfer along the support wire. 

Table 10.1 Grades of plastic igniter cord that are commercially available.

PIC Plastic Igniter Cord. A fuse burning with an intense flame progressively along its length. Used for igniting the match attached to shells, etc. Different burning speeds are available from 49 sm to 3.3 sm ... 

Fig 71 (Plaster shooting with plaster igniter cord) 38a) Giua, Trattato 6(1) (1959), 414-31 (Sostanze innescanrij ... 

Anzundkette = igniter train 184 Anzundlitze = igniter cord 184 Anzundlitzenverbinder = igniter cord connectors 184... 

An igniter cord is a safety fuse which burns at a fast rate (6-30 s/m) and with an open flame. The cord can be lit by an open flame or with by a conventional safety fuse (guide fuse) a connector. Its function is to ignite the cords in the desired sequence. 

Igniter cord connectors ensure a safe transmission of the sparking combustion of the igniter cord into the gunpowder core of a connected safety fuse. 

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