PERFORATOR CHARGE Russian patent published in 2010 - IPC F42B1/28 E21B43/117 

FIELD: explosives.

SUBSTANCE: charge contains axisymmetric cartridge of explosive substance (ES) in body with open cavity in the form of spherical segment in cartridge body, lining adjacent to surface of cavity, and detonator at cartridge end opposite to lining, besides the latter is arranged of inert material with inner diametre of base that equals 0.80...0.85 of cartridge base diametre with flexure along axis that equals 0.30...0.35 of its inner diametre, and as double-layer of various materials. Inner layer of lining that faces cavity is made of material with lower specific weight, for instance from aluminium, and outer one, facing cartridge, is made of material with higher specific weight, for instance from copper with thickness equal to 0.030…0.035 of inner lining diametre. Ratio of specific weights of inner and outer layers of lining equals 0.15…0.23, and ratio of their thicknesses equals 0.5…0.8. In ES cartridge at the distance equal to limit diametre of ES detonation, there is a screen of inert material installed axially for faster propagation and approach of detonation wave to the field of lining top, compared to approach of detonation wave component to peripheral parts of lining. In it there is a hole provided with diametre equal to limit diametre of ES detonation. Screen forms gap equal to critical diametre of ES detonation with side wall of body.

EFFECT: increased depth of perforation channel with its diametre being relatively invariable.

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