US4052939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tampable chub cartridge
Assignee: ETI EXPLOSIVES TECHNOLOGIES INTE
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Filing: 1976-04-01
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Granted: 1977-10-11
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Expires: 1996-04-01
Abstract
Abstract A chub cartridge containing a water-bearing blasting agent and having a film wrap of a cross-laminate of oriented film layers has at least one unlaminated zone in the film wrap in the longitudinal direction, or preferably is adapted to form a zone of multiple delaminations along said direction by virtue of scoring, the latter being the site of delamination when the cartridge has end-pressure applied to it with a tamping rod. The different layers fail in different directions along the unlaminated zone, affording a measure of integrity to the cartridge if roughly handled, as well as ease of rupture on tamping. The cartridge also has good abrasion and tear resistance, and dimensional stability.
Inventors
- 👤 Walter John Simmons
- 👤 Frank Marsden Willis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:01
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/087
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
93 words
A blasting cartridge comprising a tube of plastic film gathered and closed at both ends and filled with a water-bearing blasting agent, said film comprising a cross-laminate of oriented film layers of like composition and pliability, said layers being adapted to fail in different directions along at least one unlaminated zone so as to rupture said cartridge upon the application of end pressure thereto in a borehole with a tamping rod, said unlaminated zone(s) being formed in said cross-laminate prior to or in conjunction with the application of end pressure to said cartridge.
Claim 2
Dependent Claim
93 words
A blasting cartridge comprising a tube of plastic film gathered and closed at both ends and filled with a water-bearing blasting agent, said film comprising a cross-laminate of oriented film layers of like composition and pliability, said layers being adapted to fail in different directions along at least one unlaminated zone so as to rupture said cartridge upon the application of end pressure thereto in a borehole with a tamping rod, said unlaminated zone(s) being formed in said cross-laminate prior to or in conjunction with the application of end pressure to said cartridge.
Claim 3
Dependent Claim
19 words
A blasting cartridge of claim 1 wherein said film is a cross-laminate of two layers of oriented high-density polyolefin.
Claim 4
Dependent Claim
11 words
A blasting cartridge of claim 2 wherein said polyolefin is polyethylene.
Claim 5
Dependent Claim
99 words
A blasting cartridge of claim 2 wherein at least one of said layers has at least one scored zone along a major portion of the length of said cartridge, with the proviso that, when both of said layers have a scored zone, a scored zone in one layer is circumferentially offset from a scored zone in the other layer, each scored zone being inclined to the orientation of the layer adjacent thereto, and said cross-laminate being adapted to form said unlaminated zone(s) in situ upon the application of end pressure to said cartridge by delamination adjacent said scored zone(s).
Claim 6
Dependent Claim
37 words
A blasting cartridge of claim 4 wherein said scored zone(s) are present in only one of said layers, extend substantially the entire length of said cartridge, and are substantially parallel to the longitudinal axis of said tube.
Claim 7
Dependent Claim
15 words
A blasting cartridge of claim 5 wherin each scored zone is a single longitudinal cut.
Claim 8
Dependent Claim
12 words
A blasting cartridge of claim 6 having two closely spaced scored zones.
Claim 9
Dependent Claim
65 words
A blasting cartridge comprising a tube of plastic film gathered and closed at both ends and filled with a water-bearing blasting agent, said film comprising a cross-laminate of two layers of oriented high-density polyethylene, and one of said layers having at least one scored zone along a major portion of the length of said cartridge and inclined to the orientation of the layer adjacent thereto.
Claim 10
Dependent Claim
65 words
A blasting cartridge comprising a tube of plastic film gathered and closed at both ends and filled with a water-bearing blasting agent, said film comprising a cross-laminate of two layers of oriented high-density polyethylene, and one of said layers having at least one scored zone along a major portion of the length of said cartridge and inclined to the orientation of the layer adjacent thereto.
Claim 11
Dependent Claim
20 words
A blasting cartridge of claim 8 having two closely spaced scored zones, each scored zone being a single longitudinal cut.
Claim 12
Dependent Claim
149 words
In a method of continuously producing a series of chub cartridges by forming a web of film into a tube, longitudinally sealing the tube, feeding a water-bearing blasting agent into the tube, constricting the loaded tube at spaced intervals, applying a pair of encircling closure means to the constricted areas, and severing the tube between the pair of closure means, the improvement comprising continuously moving into a cylindrical tube-forming member a web of film comprised of a cross-laminate of two layers of oriented polyolefin of like composition and pliability, one layer of the cross-laminate film having at least one scored zone therein substantially in the direction of the web's motion as the web moves toward the tube-forming member, whereby a tube is formed from the cross-laminate film having at least one substantially longitudinal scored zone in one of the layers thereof inclined to the orientation of the other layer.
Claim 13
Dependent Claim
149 words
In a method of continuously producing a series of chub cartridges by forming a web of film into a tube, longitudinally sealing the tube, feeding a water-bearing blasting agent into the tube, constricting the loaded tube at spaced intervals, applying a pair of encircling closure means to the constricted areas, and severing the tube between the pair of closure means, the improvement comprising continuously moving into a cylindrical tube-forming member a web of film comprised of a cross-laminate of two layers of oriented polyolefin of like composition and pliability, one layer of the cross-laminate film having at least one scored zone therein substantially in the direction of the web's motion as the web moves toward the tube-forming member, whereby a tube is formed from the cross-laminate film having at least one substantially longitudinal scored zone in one of the layers thereof inclined to the orientation of the other layer.
Claim 14
Dependent Claim
26 words
A method of claim 10 wherein the scored zone(s) are substantially continuous linear cuts, and the layer scored forms the inside layer of the tube formed.
Claim 15
Dependent Claim
31 words
A method of claim 10 wherein as the cross-laminate film moves toward the tube-forming member one of the layers thereof is contacted by scoring means whereby said scored zone(s) are formed.
Claim 16
Dependent Claim
84 words
A blasting cartridge comprising a tube of plastic film gathered and closed at both ends and filled with a water-bearing blasting agent, said film comprising a cross-laminate of oriented film layers of like composition and pliability, and said cross-laminate having at least one unlaminated zone along a major portion of the length of said cartridge, whereby said layers fail in different directions along said unlaminated zone and said cartridge ruptures upon the application of end pressure thereto in a borehole with a tamping rod.
Claim 17
Dependent Claim
84 words
A blasting cartridge comprising a tube of plastic film gathered and closed at both ends and filled with a water-bearing blasting agent, said film comprising a cross-laminate of oriented film layers of like composition and pliability, and said cross-laminate having at least one unlaminated zone along a major portion of the length of said cartridge, whereby said layers fail in different directions along said unlaminated zone and said cartridge ruptures upon the application of end pressure thereto in a borehole with a tamping rod.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |