EXPLOSIVE CARTRIDGE FOR PERFORATING OPERATIONS Russian patent published in 2011 - IPC F42B3/12 F42C19/12 

FIELD: blasting operations.

SUBSTANCE: explosive cartridge consists of housing (case without bottom) in which electric ignition assembly, lead charge and small-size detonating primer are arranged. Detonating primer and lead charge includes explosive charge enclosed in the cover in the form of a cap. Ratio of linear density of detonating primer cover head (product of head material density by its thickness) to linear density of explosive charge of lead charge (product of charge density by its height) is within 0.3 to 0.6. There is a gap between detonating primer and lead charge. One or more holes interconnecting the gap to environment are made in housing wall in the gap area. Heads of covers of detonating primer and lead charge, which face each other, are made from metal or alloy having low value (less than 20·10⁶ kg/m²·s) of acoustic stiffness (product of density by sound velocity), e.g. aluminium. Thickness of detonating primer cover head is 0.4-0.6 mm.

EFFECT: improving cartridge operation reliability.

1 dwg