Abstract A blasting explosive cartridge comprising a substantially rigid tubular paper shell open at both ends, a thin-walled waterimpervious thermoplastic bag disposed in tight non-slipping relationship within said shell and a blasting explosive composition contained within said impervious bag, said bag being sealed at both ends and having an unfilled portion projecting outward one open end of said shell, the opposite open end of said shell having a heat-shrunk thermoplastic cap in closely adhering relationship thereover. Contrarily to cartridges of the prior art, the new cartridge is devoid of any gathering of paper at either end. This property has the advantage of assuring uninterrupted propagation of explosion in a train of cartridges placed end-to-end in a borehole.
Inventors
👤 Kee J Mc
👤 G Towell
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-26 14:53
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/087; F42B3/28
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
76 words
A blasting explosive cartridge comprising a substantially rigid tubular paper shell open at both ends, a thin-walled waterimpervious thermoplastic bag disposed in tight non-slipping relationship within said shell and a blasting explosive composition contained within said impervious bag, said bag being sealed at both ends and having an unfilled portion projecting outward beyond one open end of said shell, the opposite open end of said shell having a tapered thermoplastic cap in closely adhering relationship thereover.
Claim 2
Dependent Claim
76 words
A blasting explosive cartridge comprising a substantially rigid tubular paper shell open at both ends, a thin-walled waterimpervious thermoplastic bag disposed in tight non-slipping relationship within said shell and a blasting explosive composition contained within said impervious bag, said bag being sealed at both ends and having an unfilled portion projecting outward beyond one open end of said shell, the opposite open end of said shell having a tapered thermoplastic cap in closely adhering relationship thereover.
Claim 3
Dependent Claim
23 words
A cartridge as claimed in claim 1 wherein the bag has two plies and only the inner ply is heat-sealed at both ends.
Claim 4
Dependent Claim
20 words
A cartridge as claimed in claim 1 wherein the bag has two plies which are both heat-sealed at both ends.
Claim 5
Dependent Claim
17 words
A cartridge as claimed in claim 1 wherein the thermoplastic cap is made of heat-shrunk thermoplastic film.
Claim 6
Dependent Claim
15 words
A cartridge as claimed in claim 1 wherein the thermoplastic cap is a preformed cap.
Claim 7
Dependent Claim
23 words
A cartridge as claimed in claim 1 wherein the unfilled projecting portion of the bag is bunched by means of a wire tie.