EP0013473B1 - Bouchon de fermeture pour cartouches - Google Patents

Bouchon de fermeture pour cartouches Download PDF

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Publication number
EP0013473B1
EP0013473B1 EP79302408A EP79302408A EP0013473B1 EP 0013473 B1 EP0013473 B1 EP 0013473B1 EP 79302408 A EP79302408 A EP 79302408A EP 79302408 A EP79302408 A EP 79302408A EP 0013473 B1 EP0013473 B1 EP 0013473B1
Authority
EP
European Patent Office
Prior art keywords
case
cartridge case
cartridge
closure disc
disc
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
Application number
EP79302408A
Other languages
German (de)
English (en)
Other versions
EP0013473A1 (fr
Inventor
Arthur Stephen Wright
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Publication of EP0013473A1 publication Critical patent/EP0013473A1/fr
Application granted granted Critical
Publication of EP0013473B1 publication Critical patent/EP0013473B1/fr
Expired legal-status Critical Current

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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
    • F42B3/24—Cartridge closures or seals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D39/00—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers

Definitions

  • This invention relates to a tubular blasting cartridge case closed at least at one end by a disc of synthetic plastics material.
  • Explosive compositions including gelatinous nitroglycerine explosives, aqueous slurry explosives and ammonium nitrate powder explosives have for many years been packaged in rigid tubular cardboard ortough plastics cartridge cases, the ends of the cases being closed by inwardly crimping a portion of the container wall or by covering the end with a thin cardboard or plastics disc.
  • closure disc described in US-A-2 345 887 is a solid synthetic plastics disc in sealing relationship with a cartridge case.
  • cartridge end-closures consisting of solid plastics discs significantly increased the likelihood of firedamp ignition, and should therefore preferably not be employed in cartridges for use in coal mines.
  • deformable, water sensitive explosive composition such as aqueous slurry explosives are usually packed in closed waterproof bags of thin flexible synthetic plastics such as polyethylene and the bags are placed inside rigid or tough tubular containers of cardboard or plastics material. Because of the need to seal the plastics inner bags and plug the ends of the rigid containers there is often exces- . sive space between the explosive contents of adjacent cartridges so that with relatively insensitive explosives in small diameters the detonation may fail to propagate between adjacent cartridges in file.
  • At least one end of a tubular blasting cartridge case is closed by a transverse closure disc of resilient closed-cell foamed synthetic plastics material foamed by blowing with inert gas, said disc having an uncompressed diameter greater than the internal diameter of the tubular case, the dimensions of the closure disc being such that the disc resilience causes sufficient outward radial pressure against the case that the case is sealed against the ingress of ambient water.
  • the cartridge case end may be plain but more reliable retention of the closure disc is obtained if the end rim of the tubular case is folded over internally to form an end bead, or if one or more internal projections, for example, one or more cannelures are formed in the end portion of the case to engage the closure disc and hold it in position.
  • the degree of foaming and the thickness of the closure disc are not narrowly critical, the practical requirement being that the foamed material should be sufficiently resilient to provide the required seal.
  • a foamed material having a density of 30 to 70 kg/m 3 is generally satisfactory and discs having a thickness to uncompressed diameter ratio of 1:2.5 to 1:5 are generally sufficiently robust to provide an adequate seal, to resist displacement and to be readily pierced for the insertion of a detonator in the field.
  • closure disc should be made from foamed polyethylene, preferably blown with an inert gas, for example, nitrogen.
  • a convenient, easily made closure disc is one shaped by stamping from a sheet of foamed plastics material, for example, closed-cell foamed polyethylene commercially available under the name "Plastazote” (Registered Trade Mark) from Bakelite Xylonite Limited.
  • the uncompressed diameter of the disc is preferably 10 to 25% greater than the internal diameter of the cartridge case.
  • a disc having a diameter of 33 to 37.5 mm, preferably 35 mm is convenient.
  • the thickness of the disc in this case is conveniently 7 to 12 mm.
  • the cartridge case may conveniently be made from any of the materials commonly used for that purpose, for example, cardboard, helically wound multi-ply paper or extruded plastics material.
  • Figs. 1 to 4 inclusive are longitudinal medial sections of cartridge ends closed in accordance with the invention.
  • like parts are depicted by the same numeral.
  • a disc 11 of resilient closed cell polyethylene is inserted into an end portion of a cartridge case 12.
  • the disc 11 has a greater diameter than the internal diameter of the cartridge case 12 and is compressed to permit its insertion into the cartridge case.
  • the disc 11 pressed tightly around its periphery against the case 12 and seals the case against the ingress of water, so that the explosive contents of the cartridge, which may advantageously be aqueous slurry explosive or a powdered explosive based on ammonium nitrate, are protected from ambient water.
  • the other end of the cartridge case 12 may if desired be closed with a similar closure although any other waterproof closure may be used.
  • Fig. 2 the end of the cartridge case 12- is turned over to form a top bead 13 against which the disc 11 abuts so that the disc is more difficult to displace from the case 12 by distortion of the case.
  • the cartridge case is shaped at the end by two cannelures 14 and 15 between which the disc 11 is positively located.
  • the cartridge end of Fig. 4 is a modification of the cartridge end of Fig. 3 in which the mouth end of the cartridge case 12 is extended beyond the cannelure 14 to provide an internally threaded portion 16 which is adapted to receive an externally threaded portion of an end of an adjacent cartridge.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Buffer Packaging (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Claims (7)

1. Etui tubulaire (12) de cartouche de sautage fermé à au moins une extrémité par un disque transversal de fermeture (11) réalisé en matière plastique synthétique et possédant un diamètre, à l'état non comprimé, supérieur au diamètre intérieur de l'étui tubulaire, caractérisé en ce que le disque de fermeture (11) est réalisé en une matière plastique élastique à cellules fermées qui est amenée à l'état de mousse par injection d'un gaz inerte, les dimensions dudit disque de fermeture étant telles que l'élasticité du disque provoque l'application d'une pression radiale vers l'extérieur suffisante, contre l'étui (12), pour que l'étui soit fermé en s'opposant de façon étanche à l'entrée de l'eau ambiante.
2. Etui de cartouche selon la revendication 1, dans lequel le bord extrême de l'étui tubulaire (12) est replié vers l'intérieur pour former un bourrelet extrême (13) destiné à retenir le disque de fermeture (11) dans l'extrémité de l'étui de la cartouche.
3. Etui de cartouche selon la revendication 1, dans lequel une ou plusieurs cannelures (14, 15) sont formées dans la partie extrême de l'étui (12) afin de s'enclencher avec le disque (11) de fermeture et de le maintenir en position.
4. Etui de cartouche selon l'une quelconque des revendications 1 à 3 incluse, dans lequel la matière plastique cellulaire présente une masse volumique de 30 à 70 kg/m 3.
5. Etui de cartouche selon l'une quelconque des revendications 1 à 4 incluse, dans lequel le disque (11) de fermeture présente un rapport de l'épaisseur au diamètre, à l'état non comprimé, de 1:2,5 à 1:5.
6. Etui de cartouche selon l'une quelconque des revendications 1 à 5 incluse, dans lequel le diamètre à l'état non comprimé du disque de fermeture (11) est supérieur de 10 à 25% au diamètre interne de l'étui de cartouche (12).
7. Cartouche explosive comprenant une composition explosive gélatineuse à la nitroglycérine, une composition explosive à suspension aqueuse ou une composition explosive en poudre au nitrate d'ammonium, enveloppée dans un étui tubulaire (12) de cartouche selon l'une quel- . conque des revendications 1 à 6 incluse.
EP79302408A 1979-01-15 1979-11-01 Bouchon de fermeture pour cartouches Expired EP0013473B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB7901348 1979-01-15
GB7901348 1979-01-15
GB7937952A GB2040412B (en) 1979-01-15 1979-11-01 Cartridge end-closure

Publications (2)

Publication Number Publication Date
EP0013473A1 EP0013473A1 (fr) 1980-07-23
EP0013473B1 true EP0013473B1 (fr) 1986-12-17

Family

ID=26270224

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79302408A Expired EP0013473B1 (fr) 1979-01-15 1979-11-01 Bouchon de fermeture pour cartouches

Country Status (5)

Country Link
EP (1) EP0013473B1 (fr)
JP (1) JPS5596899A (fr)
AU (1) AU525543B2 (fr)
CA (1) CA1146803A (fr)
GB (1) GB2040412B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8006622B2 (en) 2006-11-07 2011-08-30 Orica Explosives Technology Pty Ltd Protector for detonator, and method of use

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60181600U (ja) * 1984-05-08 1985-12-02 旭化成株式会社 安全被筒
AUPP225298A0 (en) * 1998-03-10 1998-04-02 Orica Australia Pty Ltd Method and device for loading blastholes

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1365996A (fr) * 1963-04-02 1964-07-10 Ruggieri Ets Cartouche notamment pour explosifs

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE183441C (fr) *
BE422629A (fr) * 1938-04-15
US2345887A (en) * 1940-04-05 1944-04-04 Hercules Powder Co Ltd Method of sealing containers
US2930275A (en) * 1955-11-15 1960-03-29 American Cyanamid Co Method of sealing spirally wound dynamite containers
US2916995A (en) * 1956-05-17 1959-12-15 Du Pont Tamping plug
US2996232A (en) * 1956-09-14 1961-08-15 Du Pont End closures
US2918003A (en) * 1957-04-29 1959-12-22 Mine Safety Appliances Co Deep water cartridge
US3264992A (en) * 1964-03-09 1966-08-09 Marlin E Beck Tamping plug
NL6511016A (fr) * 1964-09-12 1966-03-14
DE1288544B (de) * 1968-01-31 1969-02-06 Dynamit Nobel Ag Verfahren zur Erhoehung der Sicherheit beim Schiessen im Kohlebergbau
US3477373A (en) * 1968-04-04 1969-11-11 Us Navy Underwater demolition package
AU462018B2 (en) * 1970-09-21 1975-06-12 Ici Australia Limited Improvements in and relating to resilient stemming devices
FR2254486A1 (en) * 1973-12-17 1975-07-11 Kwm Schlichter Et Suss Kg Closed cell foam bottle stopper - has dense smooth external surface and inner cork granules
DE2506865A1 (de) * 1975-02-18 1976-08-26 Feistel Pyrotech Fab Verfahren zum verschliessen von patronen
FR2307843A1 (fr) * 1975-04-15 1976-11-12 Simflex Substitut du liege naturel, notamment pour le bouchage de recipients
DE2629417C2 (de) * 1975-06-30 1983-05-11 Denka Chemical Corp., 77017 Houston, Tex. Elastomere Zusammensetzung aus einer Polychloropren-Sol-Gel-Mischung
US4000696A (en) * 1975-09-05 1977-01-04 Excoa, Inc. Cartridge for two component field mixed explosive
US4091136A (en) * 1976-05-17 1978-05-23 Shaw Plastics Corporation Synthetic cork-like material and method of making same

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1365996A (fr) * 1963-04-02 1964-07-10 Ruggieri Ets Cartouche notamment pour explosifs

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8006622B2 (en) 2006-11-07 2011-08-30 Orica Explosives Technology Pty Ltd Protector for detonator, and method of use

Also Published As

Publication number Publication date
JPS5596899A (en) 1980-07-23
GB2040412B (en) 1982-08-04
CA1146803A (fr) 1983-05-24
EP0013473A1 (fr) 1980-07-23
AU5283479A (en) 1980-07-24
GB2040412A (en) 1980-08-28
AU525543B2 (en) 1982-11-11
JPS6350638B2 (fr) 1988-10-11

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