초록 ▼

A flexible non destructing detonating cord including an inner sheath (2) of 99.5% pure aluminium or silver which is drawn down to an outer diameter of 0.85 mm so as to compress an NHS explosive core (1) to a density of between 1.2 and 1.6 g/cc. The cord also includes an outer sheath (3) of stainless

A flexible non destructing detonating cord including an inner sheath (2) of 99.5% pure aluminium or silver which is drawn down to an outer diameter of 0.85 mm so as to compress an NHS explosive core (1) to a density of between 1.2 and 1.6 g/cc. The cord also includes an outer sheath (3) of stainless steel which is drawn down to an outer diameter of 2.00 mm into gripping contact with the inner sheath and acts to prevent swelling of the cord when the explosive in the cord is detonated. The invention also provides a method of manufacturing the detonating cord.

대표청구항 ▼

A method of manufacturing a detonating cord comprising the steps of: (a) filling an inner sheath with high explosive, (b) drawing the inner sheath out so as to simultaneously extend its length, reduce its diameter and compress the explosive contained therein, (c) placing the drawn down inner sheath

A method of manufacturing a detonating cord comprising the steps of: (a) filling an inner sheath with high explosive, (b) drawing the inner sheath out so as to simultaneously extend its length, reduce its diameter and compress the explosive contained therein, (c) placing the drawn down inner sheath into an outer sheath, and (d) drawing down the outer sheath over the inner sheath so as to work harden the outer sheath and to simultaneously extend the outer sheath length and reduce the diameter of the outer sheath to below 2.50 mm and until it grippingly engages the inner sheath, the outer sheath having a hoop strength which is higher than that of the inner sheath and which is sufficient to prevent plastic deformation of the outer sheath when the cord is detonated.