EP0468838A1 - Zündsystem für eine pyrotechnische Zusammensetzung - Google Patents

Zündsystem für eine pyrotechnische Zusammensetzung Download PDF

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Publication number
EP0468838A1
EP0468838A1 EP91401800A EP91401800A EP0468838A1 EP 0468838 A1 EP0468838 A1 EP 0468838A1 EP 91401800 A EP91401800 A EP 91401800A EP 91401800 A EP91401800 A EP 91401800A EP 0468838 A1 EP0468838 A1 EP 0468838A1
Authority
EP
European Patent Office
Prior art keywords
composition
mass
ignition system
ignition
flame
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.)
Granted
Application number
EP91401800A
Other languages
English (en)
French (fr)
Other versions
EP0468838B1 (de
Inventor
René Laurensou
Richard Vineau
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.)
Giat Industries SA
Original Assignee
Giat Industries SA
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 Giat Industries SA filed Critical Giat Industries SA
Publication of EP0468838A1 publication Critical patent/EP0468838A1/de
Application granted granted Critical
Publication of EP0468838B1 publication Critical patent/EP0468838B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/04—Arrangements for ignition
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
    • C06C5/00—Fuses, e.g. fuse cords
    • C06C5/06—Fuse igniting means; Fuse connectors
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
    • C06C9/00—Chemical contact igniters; Chemical lighters

Definitions

  • the field of the present invention is that of ignition systems for pyrotechnic compositions and in particular for delay pyrotechnic compositions.
  • compositions are generally ignited by means of a composition known as a hot composition (such as a mixture of titanium and boron), itself initiated by a composition sensitive to percussion or to the heating of an electrical conductor.
  • a hot composition such as a mixture of titanium and boron
  • compositions are enclosed in a box whose function is to isolate them from ambient humidity which degrades their characteristics.
  • the casing is closed by a metal sheet called a "paillet" (generally aluminum or tin) which is thin enough to be pierced by a striker (see by example patent US4841856).
  • a metal sheet generally aluminum or tin
  • the form of the delay component will therefore depend on the final structure of the initiating device, which implies that a modification of the definition of said system will require the delay component to be redesigned.
  • the receptor composition is in all cases another primer which is initiated by the shock resulting from the projection of metal fragments, this shock being able to perfectly initiate the primer through the flake.
  • the hot compositions necessary to ignite the pyrotechnic delays are not sufficiently sensitive to shock to be able to be thus initiated directly, and it will therefore be necessary to provide an additional primer upstream of the hot composition, primer which will be initiated directly by a striker (with the problems of defining the geometry of the delay mentioned previously), or through a conduit.
  • the subject of the invention is an ignition system for a pyrotechnic composition
  • a pyrotechnic composition comprising, disposed in a housing, an ignition relay which is in contact with the pyrotechnic composition; it is characterized in that the housing is closed by a lattice in contact with a composition sensitive to the flame itself in contact with the ignition relay.
  • the fineness of the mesh of the lattice is less than the particle size of the flame-sensitive composition; thus, it is possible to use a composition that is not very compacted.
  • the flame-sensitive composition comprises a mixture consisting of 25% to 50% by mass of Zirconium and 50% to 75% by mass of Barium Chromate, and preferably is a tablet comprising 37% by mass of Zirconium and 63% by mass of Barium Chromate, the particle size of the mixture being between 40 ⁇ m and 100 ⁇ m.
  • the ignition relay comprises a mixture consisting of 20% to 60% by mass of Zirconium, 30% to 70% by mass of Barium Chromate and 0% to 20% by mass of potassium perchlorate, and preferably the relay is a tablet comprising: 40% by mass of zirconium, 50% by mass of barium chromate and 10% by mass of potassium perchlorate.
  • the ignition system will advantageously apply to the production of a delay cord integrated in a metal sheath.
  • the ignition system will be used in a priming device in which a percussion-sensitive priming composition is connected to the flame-sensitive composition by a conduit.
  • the priming composition sensitive to percussion comprises a tablet of a mixture of 52% by mass of potassium perchlorate, 25% by mass of lead thiocyanate, 13% by mass of antimony sulfide. and 10% by mass of lead tricinate.
  • FIG. 1 represents an ignition system according to the invention associated with a pyrotechnic delay cord and with an ignition device shown diagrammatically,
  • Figure 2 shows the trellis alone.
  • an ignition system 1 is shown integral with a cord 9 containing a pyrotechnic composition with delay 2. It consists of a housing 3 of aluminum alloy, the l 'thickness is of the order of a few tenths of mm, and which is fixed to the cord 9 by notches.
  • an ignition relay 4 which is here a mixture of 40% by mass of Tungsten (W), 50% by mass of Barium Chromate (BaCrO4) and 10% by mass of perchlorate of Potassium (KClO4), the particle size of the components preferably being chosen less than 100 ⁇ m.
  • Tungsten between 20% and 60%, Barium chronate between 30% and 70%, Potassium perchlorate between 0% and 20%.
  • any other hot composition comprising an oxidizing agent and a reducing agent could be envisaged, such as a mixture of aluminum and copper oxide AlCuO in the proportions by respective masses 20% / 80%, or else a mixture of Zirconium and Lead Chromate in the proportions by respective masses 60% / 40%, or a mixture of Boron and Potassium Nitrate in the proportions by respective masses 60% / 40%.
  • Titanium-Boron TiB
  • TiB Titanium-Boron
  • a flame-sensitive composition 6 which is here a mixture of Zirconium and Barium Chromate in the respective proportions by mass 37% / 63%, with a particle size between 50 ⁇ m and 100 ⁇ m .
  • the proportions by mass may vary in the following ranges:
  • Zircomium between 25% and 50%, Barium chromate between 50% and 75%.
  • composition comprising an oxidizing agent and a reducing agent could be adopted, for example a composition Magnesium, Teflon (registered trademark for Polytetrafluoroethylene), Viton (registered trademark for a copolymer of vinylidene fluoride / hexafluoropropylene), but the criterion for choosing the composition will be its sensitivity to flame.
  • a composition Magnesium, Teflon (registered trademark for Polytetrafluoroethylene), Viton (registered trademark for a copolymer of vinylidene fluoride / hexafluoropropylene), but the criterion for choosing the composition will be its sensitivity to flame.
  • a given composition will be considered to be sensitive to flame if, for ten consecutive tests, it has 100% initiation by the igniter thus described at a distance of at least 470 mm.
  • a composition will be all the more sensitive as it will be weakly compressed, preferably a compression ratio of between 107 and 8.107 Pascal will be adopted.
  • composition of the ignition relay 4 as well as that sensitive to the flame 6 are manufactured by known methods, for example that in which the following phases are found: coating with a binder (for example nitrocellulose) in a solvent, drying , granulation, placement in the housing and compression.
  • a binder for example nitrocellulose
  • a wire mesh 5 is deposited on the composition 6 and the box 3 is closed over the assembly by an annular crimping.
  • the trellis is shown in detail in FIG. 2. It comprises wires 15, of stainless steel, crisscrossed and whose diameter is of the order of a hundredth of a mm.
  • the fineness of the lattice (a), which is defined as the diameter of the largest particle that can pass through the meshes, will be chosen less than the particle size of the mixture, ie here a fineness of 40 ⁇ m.
  • the material of the trellis will be chosen as a function of the desired mechanical strength, the metallic materials, and in particular stainless steel, make it possible to obtain trellises with fine meshes and having a suitable rigidity.
  • the thermal conductivity of the straw by allowing the heat received to be dissipated prevents ignition.
  • the housing 3 is freely adjusted in a bore 16 made in a priming device 11 (not shown in detail).
  • the fineness of the trellis guarantees suitable ignition of the composition even in the case of gas flows at the periphery of the housing 3.
  • a conduit 8 connects the flame-sensitive composition 6 to a priming composition 7 sensitive to percussion and which may be associated with a flame-enhancing composition, the assembly constituting an igniter.
  • a priming composition a tablet of a mixture of potassium perchlorate, lead thiocyamate, antimony sulfide and lead tricinate in the respective proportions by mass 52% ⁇ 20%, 25% ⁇ 10%, 13% ⁇ 10% and 10% ⁇ 10%.
  • the priming composition will combine an oxidizing agent (such as potassium perchlorate), a reducing agent (such as lead thiocyanate), a friction-increasing agent (such as Antimony Sulfide), and possibly a sensitizer (such as lead tricinate), the flame-enhancing composition being an oxidizing / reducing composition.
  • an oxidizing agent such as potassium perchlorate
  • a reducing agent such as lead thiocyanate
  • a friction-increasing agent such as Antimony Sulfide
  • a sensitizer such as lead tricinate
  • the igniter and the conduit are thus associated with the ignition system previously described to complete the pyrotechnic chain for igniting the delay composition 2 of the string 9.
  • the priming composition 7 is initiated by a striker 14 which moves towards it in the direction F.
  • the duct may have various shapes and profiles, the lattice not isolating the flame-sensitive composition from projections from the igniter.
  • the receiving composition is a composition sensitive to percussion and the conduit is straight so as not to slow the flow of hot particles impacting the receiving composition.
  • conduits which are not straight the only important parameter will be the length of the conduit.
  • the ignition system will then be designed by varying the power of the igniter 7 (for example by increasing its mass) and / or the sensitivity of the flame-sensitive composition 6 (for example by modifying the compression ratio) .
  • the delay cord 9 of known type comprises for example a composition 2 of tungsten, barium chromate and potassium perchlorate in the respective proportions in the following masses: 30%, 60% and 10% (see for example patent FR2464932 ).
  • This composition 2 is enclosed in a metallic sheath 10, of Lead or Tin, of approximately 3 mm of external diameter.
  • this cord is disposed in a bore 17 arranged in the priming device 11, it carries a detonation relay 12 of known type, for example constituted by a layer of lead azide followed by a layer d 'hexogen.
  • This relay initiates a receiving charge 13 which in turn will initiate an explosive charge, not shown.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Air Bags (AREA)
EP91401800A 1990-07-27 1991-07-02 Zündsystem für eine pyrotechnische Zusammensetzung Expired - Lifetime EP0468838B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9009604 1990-07-27
FR9009604A FR2665254B1 (fr) 1990-07-27 1990-07-27 Systeme d'allumage pour une composition pyrotechnique.

Publications (2)

Publication Number Publication Date
EP0468838A1 true EP0468838A1 (de) 1992-01-29
EP0468838B1 EP0468838B1 (de) 1994-11-30

Family

ID=9399159

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91401800A Expired - Lifetime EP0468838B1 (de) 1990-07-27 1991-07-02 Zündsystem für eine pyrotechnische Zusammensetzung

Country Status (6)

Country Link
US (1) US5147976A (de)
EP (1) EP0468838B1 (de)
DE (1) DE69105393T2 (de)
FR (1) FR2665254B1 (de)
GR (1) GR3015175T3 (de)
IL (1) IL98954A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2706449A1 (fr) * 1993-06-18 1994-12-23 Giat Ind Sa Composition pyrotechnique pour cordeaux retards.

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5331894A (en) * 1993-06-25 1994-07-26 The Ensign-Bickford Company Explosive release coupling
US5834682A (en) * 1995-02-03 1998-11-10 Warren; Cyrus E. Radar signal cartridge
US5710390A (en) * 1995-08-01 1998-01-20 Ofca; William W. Shock tube initiating system for display fireworks
US5831207A (en) * 1996-10-30 1998-11-03 Breed Automotive Technology, Inc. Autoignition composition for an airbag inflator
US5898123A (en) * 1997-05-01 1999-04-27 The Ensign-Bickford Company Sealing device and a method for assembly thereof
US6021715A (en) * 1997-05-02 2000-02-08 The Ensign-Bickford Company Manifold for coupling with a tube and method thereof
US6125762A (en) * 1997-07-03 2000-10-03 The Ensign-Bickford Company Flat-form separation devices
PT1062188E (pt) * 1998-03-06 2008-10-22 Gen Dynamics Ordnance & Tactic Escorvas não tóxicas para munições de pequeno calibre
FR2776656B1 (fr) * 1998-03-30 2000-04-28 Giat Ind Sa Procede de fabrication d'un objet a partir d'un materiau granulaire, tube allumeur et charge propulsive obtenus avec un tel procede
WO2001029499A1 (en) * 1999-10-20 2001-04-26 Chemical Holdings Int. Ltd. A blast initiation system
US20080217893A1 (en) * 2004-06-17 2008-09-11 Nof Corporation Firing Agent for Gas Generating Device
JP4473818B2 (ja) * 2005-12-28 2010-06-02 昭和金属工業株式会社 イニシエータ用点火薬とその製造方法及びそれを用いたイニシエータの製造方法
US11713142B2 (en) * 2017-12-01 2023-08-01 Ensign-Bickford Aerospace & Defense Comany Separation device assemblies
RU2719830C2 (ru) * 2018-07-31 2020-04-23 федеральное государственное бюджетное образовательное учреждение высшего образования "Самарский государственный технический университет" Пиротехнический состав
JP2023096436A (ja) * 2021-12-27 2023-07-07 日本化薬株式会社 点火薬、およびそれを含む点火器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1191270A (fr) * 1957-02-12 1959-10-19 Montedison Spa Dispositif de groupage pour les mises à feu multiples simultanées
GB2018403A (en) * 1978-04-07 1979-10-17 Nitro Nobel Ab Blasting cap
EP0015697A1 (de) * 1979-02-26 1980-09-17 E.I. Du Pont De Nemours And Company Nichtelektrischer Verzögerungszünder und Zusammensetzung eines solchen Verzögerungszünders mit einer Detonationszündschnur

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2730046A (en) * 1950-09-19 1956-01-10 Bofors Ab Safety device for the explosive head of a missile
US2796834A (en) * 1956-03-09 1957-06-25 Canadian Ind Short interval delay blasting device
US3343487A (en) * 1965-12-22 1967-09-26 Jr George F Hare Pyrotechnic delay device for mild detonating fuze
US3727552A (en) * 1971-06-04 1973-04-17 Du Pont Bidirectional delay connector
CH676389A5 (de) * 1987-07-29 1991-01-15 Eidgenoess Munitionsfab Thun

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1191270A (fr) * 1957-02-12 1959-10-19 Montedison Spa Dispositif de groupage pour les mises à feu multiples simultanées
GB2018403A (en) * 1978-04-07 1979-10-17 Nitro Nobel Ab Blasting cap
EP0015697A1 (de) * 1979-02-26 1980-09-17 E.I. Du Pont De Nemours And Company Nichtelektrischer Verzögerungszünder und Zusammensetzung eines solchen Verzögerungszünders mit einer Detonationszündschnur

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2706449A1 (fr) * 1993-06-18 1994-12-23 Giat Ind Sa Composition pyrotechnique pour cordeaux retards.
EP0630876A1 (de) * 1993-06-18 1994-12-28 GIAT Industries Pyrotechnische Zusammensetzung für Verzögerungsschnüre

Also Published As

Publication number Publication date
DE69105393T2 (de) 1995-05-04
IL98954A (en) 1996-01-19
EP0468838B1 (de) 1994-11-30
DE69105393D1 (de) 1995-01-12
IL98954A0 (en) 1992-07-15
FR2665254A1 (fr) 1992-01-31
FR2665254B1 (fr) 1992-10-16
US5147976A (en) 1992-09-15
GR3015175T3 (en) 1995-05-31

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