US3791297A - Explosive package - Google Patents

Explosive package Download PDF

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Publication number
US3791297A
US3791297A US00310887A US3791297DA US3791297A US 3791297 A US3791297 A US 3791297A US 00310887 A US00310887 A US 00310887A US 3791297D A US3791297D A US 3791297DA US 3791297 A US3791297 A US 3791297A
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US
United States
Prior art keywords
explosive
blasting
package
bag
panels
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00310887A
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English (en)
Inventor
J Mckee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CA Industries Ltd
Original Assignee
CA Industries Ltd
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Filing date
Publication date
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Publication of US3791297A publication Critical patent/US3791297A/en
Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/087—Flexible or deformable blasting cartridges, e.g. bags or hoses for slurries
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive

Definitions

  • thermoplastic film package containing a blasting explosive having particular utility in secondary blasting operations.
  • the package is especially suitable for aqueous slurry blasting agents which are filled through a self-closing valved opening.
  • the package is also provided in the form of a train of detachably connected side-by-side packages.
  • This invention relates to a novel explosive package. More particularly, the invention relates to an improved package for explosives used in secondary blasting.
  • the improved explosive package of the invention comprises a bag-like container of thermoplastic film and a blasting explosive composition contained within said container, said container being heat-sealed along at least two of its edges and having a valved filling opening for the introduction of blasting explosive therein.
  • FIG. 1 shows a view of a preferred embodiment of a package made in accordance with the present invention
  • FIG. 2 shows a view of the package of FIG. 1 taken along line AA thereof;
  • FIG. 3 shows an alternative form of package
  • FIG. 4 shows a train of the packages of FIG. 1 detachably connected together.
  • FIGS. 1 and 2 of the drawing there is shown a valve bag 1 containing an explosive composition.
  • Bag 1 which is of the general pillowcase type has a back wall 2 and a front wall made of partially overlapping panels 3 and 4. Panels 3 and 4 are shown as integral with back wall 2 and thus form with the latter a length of tube which is closed at both ends by transverse seams 5 and 6. Except for a limited portion 7 extending transversely of the bag, panels 3 and 4 are united to each other in their common area of overlap by seams 8 and 9 extending from transverse seals 5 and 6 respectively to said portion 7.
  • the portion 7 left unsealed in the common area of overlap between panels 3 and 4 constitutes a tubular valve opening suitable for insertion into the bag of filling spout 10.
  • the edge of panel 3 acts as a valve which closes upon pressure exerted by the explosive mixture and prevents egress of the latter through the unsealed portion 7.
  • FIG. 3 shows a package generally similar to that of FIG. 1 and 2 with the exception that it comprises a bag having two ply walls.
  • the back wall 2 is comprised of plies 2A and 2B and the panels 3 and 4 of the front wall are comprised of plies 3A and 3B and plies 4A and 48 respectively.
  • Panel 3 which, in the area of overlap with panel 4 is located inwardly of the bag with respect to said panel 4, is characterized in that the free edge of its inner ply 3A projects somewhat beyond the free edge of its outer ply 33.
  • the bag which the package of FIG. 3 is made of is similar to that shown in FIGS. 1 and 2.
  • the edges of plies 3A and 38 act as dual valves which close the unsealed portion 7 upon pressure of the explosive mixture contained in the bag.
  • FIG. 4 shows a series or train of explosive-filled bags such as illustrated in FIGS. 1 and 2 or FIG. 3, interconnected by webs 11 of the film material which the bags are made of. Webs 11 have perforations 12 therein to aid in detaching one package from the adjacent one when desired.
  • AN/FO explosives may be used in the explosive package of the invention
  • the preferred explosive for use is an aqueous slurry mixture comprising a thickened mixture of oxidizer salts and fuels dispersed in an aqueous solution of the salts
  • Such a composition is economic to manufacture and safe to use and is ideally suited to the aforedescribed container since it results in a package which is kneadable and which can be wedged into rock fissures or conformed to rock irregularities.
  • Slurry explosives may also be packaged in the described container by simple extrusion methods thus to provide a package of high density. The resultant package resembles somewhat a small pillow.
  • the thermoplastic film employed in the container preferably has a thickness of about 4 mils and doubleply film of 2 mils in each ply has been used to manufacture superior packages. Double ply containers exhibit improved tear resistance over single ply containers.
  • a number of flexible plastic materials combining high tensile and tear strength are known which may be used in the construction of the container and which will suggest themselves to those skilled in the art.
  • a preferred material of construction is polyethylene having a wall thickness of from about 2 to about 8 mils.
  • the explosive package of the invention may be provided in a detachable train form.
  • a detachable train form permits the blaster to choose one, two or more packages as may suit the needs of the blasting to be undertaken.
  • the connected packages for multiple use can be simply pleated together in accordion fashion to provide larger charges.
  • Single containers may be simply detached by tearing along the perforated or weakened connecting web.
  • valved containers may be suitably employed in the explosive package of this invention; the principal requirements for such a container being economy, ease of filling, durability and, especially, satisfactory retention of the explosive contents. While the valve container described herein has been shown to be excellent for the purpose intended, other similar known containers could doubtlessly be adapted for the purpose. A container of the type herein described is more fully disclosed by P. T. Jennings et al. in Canadian Pat. No. 709,244, granted on May 11, 1965.
  • the blaster In use in the field at the blasting site for secondary blasting, the blaster will prepare an initiation means, for example, a loop of detonating cord or a detonating cap and fuse or a small primer charge and place it in contact with the outside wall of the explosive package.
  • initiation means for example, a loop of detonating cord or a detonating cap and fuse or a small primer charge and place it in contact with the outside wall of the explosive package.
  • the choice of initiator will depend on the sensitivity of the secondary blasting explosive used. Such an initiator may be secured in place by, for example, an adhesive tape strip.
  • the thus assembled charge is then placed on the rock or obstruction to be blasted and the charge initiated.
  • charges for secondary blasting will range from about 1 to 20 pounds or more in weight.
  • Example illustrates the improved explosive package of the invention but it is in no manner to be limited to the embodiment described.
  • a blasting explosive package suitable for use in secondary blasting comprising a rectangular valve bag made from heat-scalable thermoplastic film and consisting of a back wall and a front wall, each made of two-ply panels partially overlapping each other, the said front and back panels being joined along their entire periphery, said panels in their common area of overlap being sealed together in such a manner as to form a tubular dual-valved self-closing opening extending transversely of the bag, said self-closing opening being of such a diameter as to allow the insertion therein of a filling spout, and a blasting explosive composition contained in said rectangular valve bag.
  • thermoplastic film is polyethylene film.
  • Explosive packages as claimed in claim 1 detachably connected together in side-by-side relationship.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Bag Frames (AREA)
  • Wrappers (AREA)
  • Packages (AREA)
US00310887A 1971-12-15 1972-11-30 Explosive package Expired - Lifetime US3791297A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA 130230 CA941674A (en) 1971-12-15 1971-12-15 Explosive package

Publications (1)

Publication Number Publication Date
US3791297A true US3791297A (en) 1974-02-12

Family

ID=4091789

Family Applications (1)

Application Number Title Priority Date Filing Date
US00310887A Expired - Lifetime US3791297A (en) 1971-12-15 1972-11-30 Explosive package

Country Status (12)

Country Link
US (1) US3791297A (enExample)
AU (1) AU460203B2 (enExample)
BG (1) BG29578A3 (enExample)
BR (1) BR7208832D0 (enExample)
CA (1) CA941674A (enExample)
CS (1) CS168020B2 (enExample)
GB (1) GB1356522A (enExample)
NO (1) NO132251C (enExample)
SE (1) SE400371B (enExample)
SU (1) SU579891A3 (enExample)
ZA (1) ZA728670B (enExample)
ZM (1) ZM18572A1 (enExample)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5419278U (enExample) * 1977-07-09 1979-02-07
US4787316A (en) * 1984-09-10 1988-11-29 Econex, Inc. Expandable, self-tamping explosive bag
WO1999000251A1 (en) * 1997-06-30 1999-01-07 Cryovac, Inc. Packaged explosive product and packaging process therefor
DE102006009391A1 (de) * 2006-03-01 2007-09-06 Abbruch- & Sprengarbeiten Uwe Holtmeier Gehäuse für eine Schneidladung
US7819063B1 (en) * 2007-06-21 2010-10-26 Matthew D. Lehman Inflatable explosive breaching device
US8061274B1 (en) * 2009-01-26 2011-11-22 Brejon Holdings (BVI), Ltd. Less than lethal projectile and a method for producing the same
US8516729B2 (en) 2011-05-06 2013-08-27 Brejon Holdings (BVI), Ltd. Reduced lethality gun
US9021959B2 (en) 2009-01-26 2015-05-05 Brejon Holdings (BVI), Ltd. Less than lethal cartridge
US9103613B2 (en) 2009-01-26 2015-08-11 Brejon Holdings (BVI), Ltd. Multiple cartridge assembly for less than lethal cartridge
EP2836786A4 (en) * 2012-04-13 2015-09-30 C 2 Innovations Inc LINE LOAD
US11808559B2 (en) * 2020-03-02 2023-11-07 River Front Services, Inc. Tamp for explosive material

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB974501A (enExample) * 1900-01-01
US2558163A (en) * 1947-11-19 1951-06-26 Ici Ltd Blasting explosive package
US3106159A (en) * 1962-07-23 1963-10-08 Central States Paper & Bag Co Closure bag for shot-holes
US3534685A (en) * 1967-11-07 1970-10-20 Canadian Ind Explosive package
US3731625A (en) * 1971-05-14 1973-05-08 Ici America Inc Packaged explosive

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB974501A (enExample) * 1900-01-01
US2558163A (en) * 1947-11-19 1951-06-26 Ici Ltd Blasting explosive package
US3106159A (en) * 1962-07-23 1963-10-08 Central States Paper & Bag Co Closure bag for shot-holes
US3534685A (en) * 1967-11-07 1970-10-20 Canadian Ind Explosive package
US3731625A (en) * 1971-05-14 1973-05-08 Ici America Inc Packaged explosive

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5419278U (enExample) * 1977-07-09 1979-02-07
US4787316A (en) * 1984-09-10 1988-11-29 Econex, Inc. Expandable, self-tamping explosive bag
WO1999000251A1 (en) * 1997-06-30 1999-01-07 Cryovac, Inc. Packaged explosive product and packaging process therefor
US6302027B1 (en) 1997-06-30 2001-10-16 Cryovac, Inc. Packaged explosive product and packaging process therefor
DE102006009391A1 (de) * 2006-03-01 2007-09-06 Abbruch- & Sprengarbeiten Uwe Holtmeier Gehäuse für eine Schneidladung
US7819063B1 (en) * 2007-06-21 2010-10-26 Matthew D. Lehman Inflatable explosive breaching device
US8061274B1 (en) * 2009-01-26 2011-11-22 Brejon Holdings (BVI), Ltd. Less than lethal projectile and a method for producing the same
US20120067244A1 (en) * 2009-01-26 2012-03-22 John Hayes Less than lethal projectile and a method for producing the same
US8511231B2 (en) * 2009-01-26 2013-08-20 Brejon Holdings (BVI), Ltd. Less than lethal projectile and a method for producing the same
US9021959B2 (en) 2009-01-26 2015-05-05 Brejon Holdings (BVI), Ltd. Less than lethal cartridge
US9103613B2 (en) 2009-01-26 2015-08-11 Brejon Holdings (BVI), Ltd. Multiple cartridge assembly for less than lethal cartridge
US8516729B2 (en) 2011-05-06 2013-08-27 Brejon Holdings (BVI), Ltd. Reduced lethality gun
EP2836786A4 (en) * 2012-04-13 2015-09-30 C 2 Innovations Inc LINE LOAD
US11808559B2 (en) * 2020-03-02 2023-11-07 River Front Services, Inc. Tamp for explosive material

Also Published As

Publication number Publication date
BG29578A3 (en) 1980-12-12
SU579891A3 (ru) 1977-11-05
NO132251B (enExample) 1975-06-30
CS168020B2 (enExample) 1976-05-28
GB1356522A (en) 1974-06-12
ZA728670B (en) 1974-07-31
BR7208832D0 (pt) 1974-02-21
CA941674A (en) 1974-02-12
ZM18572A1 (en) 1974-09-23
AU4946572A (en) 1974-05-30
SE400371B (sv) 1978-03-20
AU460203B2 (en) 1975-04-17
NO132251C (enExample) 1975-10-08

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