EP1367356A1 - Safety initiator - Google Patents

Safety initiator Download PDF

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Publication number
EP1367356A1
EP1367356A1 EP20030291268 EP03291268A EP1367356A1 EP 1367356 A1 EP1367356 A1 EP 1367356A1 EP 20030291268 EP20030291268 EP 20030291268 EP 03291268 A EP03291268 A EP 03291268A EP 1367356 A1 EP1367356 A1 EP 1367356A1
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EP
European Patent Office
Prior art keywords
characterized
component according
material
layer
safety
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Granted
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EP20030291268
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German (de)
French (fr)
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EP1367356B1 (en
Inventor
Luc Brunet
Jean Caillard
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Nexter Munitions
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Giat Industries SA
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Priority to FR0206590A priority Critical patent/FR2840400B1/en
Priority to FR0206590 priority
Application filed by Giat Industries SA filed Critical Giat Industries SA
Publication of EP1367356A1 publication Critical patent/EP1367356A1/en
Application granted granted Critical
Publication of EP1367356B1 publication Critical patent/EP1367356B1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42CAMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C19/00Details of fuzes
    • F42C19/08Primers; Detonators
    • F42C19/12Primers; Detonators electric
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42BEXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00Blasting cartridges, i.e. case and explosive
    • F42B3/10Initiators therefor
    • F42B3/12Bridge initiators
    • F42B3/124Bridge initiators characterised by the configuration or material of the bridge

Abstract

The invention relates to a safety ignition component (1) comprising at least two electrodes (5a, 5b) connected by a fuse (6). This component is characterized in that the fuse (6) is produced in the form of a sheet of a plasma-producing material, that is to say a material providing gases at high temperature (above 15,000 K) and having an electronic density. strong (greater than 10 <18> electrons / cm3) when it is traversed by an electric current of at least 5000 amps. <IMAGE>

Description

The technical field of the invention is that of safety boot components comprising at least two electrodes connected by a fuse.

There are safety boot components for explosives, components which are said to be "sprayed-on" (more known as "slappers"). These components include a resistive bridge on which is placed a tube for example in ceramic (or "canon"). An insulating disc is placed between the tube and the resistive bridge. The passage of electric current in the deck causes it to vaporize, which causes the cutting of the insulating disc which is projected at the across the tube. This disc impacts an explosive catcher that he initiates.

The advantage of slappers is that they cannot initiate an explosive only when the supply current applied at the electrodes is important (greater than 500 volts). Concretely the operating voltages are around 3000 volts for a current intensity of the order of 5000 amps. A voltage below 500 volts is insufficient to project the disc and therefore cannot provide an initiation.

It follows from such parameters of use a great safety which allows alignment of the chain pyrotechnic between the component and the receiving explosive which is usually a relay in HNS (hexanitrostilbene).

These initiators have drawbacks, however. First of all they work with a working voltage high (3000 volts). This results in problems of electrical insulation which complicate the assemblies as well as connectivity.

In addition, in order to reduce the level of energy put in work, the resistive bridge is generally of reduced size as well as the ceramic tube (the latter most often a diameter less than a millimeter). This results in costs of significant achievements which limit the use of such components in civil applications such as initiators for automotive safety.

It is the aim of the invention to propose a component security boot that does not have such disadvantages.

The component according to the invention can operate with a reduced voltage (less than or equal to 1000 volts) while having a satisfactory level of security.

Thus, the subject of the invention is a safety ignition component comprising at least two electrodes connected by a fuse, component characterized in that the fuse is produced in the form of a sheet of a plasmagenic material, that is to say a material providing gases at high temperature (greater than 15000 K) and having a high electronic density (greater than 10 18 electrons / cm3) when it is traversed by an electric current of at least 5000 amps.

According to an essential characteristic of the invention, the fuse material includes at least one conductive material associated with at least one energetic material or likely to react with the conductive material.

The conductive material may consist of carbon or a metal.

The energetic material or material capable of reacting with the conductive material may be chosen from the following compounds or compositions:

  • Copper oxide; polytetrafluoroethylene; chlorofluoroethylene copolymer; polytetrafluoroethylene / chlorofluoroethylene copolymer; Magnesium / polytetrafluoroethylene / chlorofluoroethylene copolymer; Boron / Potassium nitrate; plasticized nitrocellulose film or film; polyvinyl nitrate; polyoxymethylene; Trifluoroethylene polychloride; polyvinyl chloride; Trifluoroethylene polychloride; polysulfone; polyvinylidene fluoride.
  • According to one embodiment, the fusible sheet may be formed by a homogeneous mixture combining 85% to 95% in mass of particles of conductive material and from 5% to 15% in mass of an energetic or potentially reactive material with the conductive material.

    The fusible sheet may thus have the composition:

  • 85% to 95% by mass of aluminum or magnesium powder,
  • 5% to 15% by mass of a composition combining polytetrafluoroethylene and chlorofluoroethylene copolymer.
  • The fuse sheet may have the composition:

  • 90% by mass of aluminum powder,
  • 10% by mass of a composition combining polytetrafluoroethylene and chlorofluoroethylene copolymer.
  • The fuse sheet may have the composition:

  • 90% by mass of magnesium powder,
  • 10% by mass of a composition combining polytetrafluoroethylene and chlorofluoroethylene copolymer.
  • According to another embodiment, the fusible sheet may include at least one layer of energetic material or likely to react with the conductive material deposited on at least part of a layer of material driver.

    The fuse may include at least one layer conductive aluminum or magnesium on which is deposited at least one reactive layer of polytetrafluoroethylene, or nitrocellulose or nitrate polyvinyl, or copper oxide or copolymer of chlorofluoroethylene, or polyoxymethylene, or Trifluoroethylene polychloride, or polysulfone, or polyvinylidene fluoride.

    The dimensions of the different layers will be chosen such that 85 to 95% by mass of the material of the conductive layer at 5 to 15% by mass of the material (s) the reactive layer (s).

    The fuse may include at least one layer aluminum or magnesium and at least one layer of chlorofluoroethylene copolymer.

    The fuse may include at least one layer of magnesium and at least one layer of polytetrafluoroethylene.

    According to a particular embodiment, the component priming device includes an axial electrode surrounded by a tube of an insulating material itself surrounded by an electrode peripheral, the fusible sheet being applied pressing on an end face of the axial electrode and also being in contact with an annular part of the electrode peripheral.

    The component may include a room for the plasma development, chamber separated by at least one electrode by the fusible sheet.

    The chamber can be delimited by the electrode peripheral.

    According to another embodiment, the component priming may also include a tablet projectable through the chamber, tablet placed between the chamber and the fuse sheet.

    The tablet may be made of an insulating material electrical or covered with an electrical insulating layer.

    The tablet may have a diameter of between 1 mm and 4 mm and a thickness between 20 and 200 micrometers.

    According to another embodiment, the component priming may include a separate housing of at least an electrode by the fusible sheet, housing inside which is arranged a pin projectable by the fusible sheet.

    The counter may advantageously have substantially the same volume than housing.

    The housing can be delimited by the electrode peripheral and the pin can be made of a material electrical insulation or covered with an insulating layer electric.

    According to another embodiment, the axial electrode, the tube of insulating material and the peripheral electrode may constitute a coaxial cable having one side flat end, and the fusible sheet will then be produced in the form of a layer of applied plasma material on the end face.

    The layer of plasmagenic material can then be constituted by a paint associating a conductive material with a polymerizable binder.

    The layer of plasmagenic material may comprise 70% to 90% by mass of aluminum, nickel or silver powder with 30% to 10% by mass of an acrylic resin.

    The layer of plasmagenic material may comprise 70% to 90% by mass of aluminum powder, with 30% to 10% by mass polyurethane.

    The invention will be better understood on reading the description which follows of different embodiments, description made with reference to the appended drawings and in which:

    • FIG. 1 is a sectional view of a priming component according to a first embodiment,
    • FIG. 2 is a partial view of an alternative embodiment of the fuse used in the ignition component,
    • FIG. 3 is a sectional view of a priming component according to a second embodiment,
    • FIG. 4 is a sectional view of a priming component according to a third embodiment,
    • FIG. 5 is a sectional view of a priming component according to a fourth embodiment,
    • Figure 6 is a sectional view of a priming component according to a fifth embodiment.

    Referring to Figure 1, a boot component of safety 1 according to the invention is fixed by means suitable (not shown) for an explosive charge 2 comprising an explosive 3 placed in an envelope 4.

    The explosive charge will for example be a relay detonation in hexogen in the pulverulent or compressed state. We could alternatively initiate directly without relay the explosive charge of a munition.

    Component 1 comprises at least two electrodes 5a and 5b which are connected by a fuse 6.

    A first axial electrode 5a consists of a metallic cylindrical rod. It is surrounded by a tube 7 of an insulating material itself surrounded by an electrode cylindrical device 5b.

    The peripheral electrode 5b therefore has a housing internal 8 which receives the insulating tube 7 and the axial electrode 5a. This housing 8 is partially closed by a flange ring 9 of the peripheral electrode which has a hole axial 10.

    The axial hole 10 is arranged opposite another hole 11 fitted in the casing 4 of the explosive charge 2.

    According to the invention the fuse 6 is produced in the form of a sheet of a plasma-producing material, that is to say a material providing gases at high temperature (greater than 15000 K) and having a high electronic density (greater than 10 18 electrons / cm3) when it is traversed by an electric current of at least 5000 amps.

    This fusible sheet is applied by pressing on one side end 22 of the axial electrode 5a and it is also in contact with the annular part 9 of the electrode device 5b.

    The plasma material will include at least one material conductor associated with at least one energetic material or likely to react with the conductive material.

    By energetic material is meant a material capable of supplying chemical energy in the form of a flame when it is initiated by the joule effect generated by the flow of current through the material driver with whom he is intimately associated.

    By reactive or susceptible to react material with the conductive material a material, isolated in isolation, but likely to react chemically with the material conductor during the heating of this one by effect Joule. Chemical energy is then provided by this reaction in the form of a flame.

    The conductive material may consist of carbon or by a metal such as copper, aluminum, silver or magnesium.

    The energetic material or material capable of reacting with the conductive material may be chosen from the following compounds or compositions:

  • Copper oxide; polytetrafluoroethylene; chlorofluoroethylene copolymer; polytetrafluoroethylene / chlorofluoroethylene copolymer; Magnesium / polytetrafluoroethylene / chlorofluoroethylene copolymer; Boron / Potassium nitrate; plasticized nitrocellulose film or film; polyvinyl nitrate; polyoxymethylene; Trifluoroethylene polychloride; polyvinyl chloride; Trifluoroethylene polychloride; polysulfone; polyvinylidene fluoride.
  • In this list the energetic materials are the compositions: Magnesium / polytetrafluoroethylene / chlorofluoro-ethylene copolymer; Boron / Nitrate potassium; plasticized nitrocellulose film or film; polyvinyl nitrate.

    Reactive materials with a conductive material are: Copper oxide; polytetrafluoroethylene; copolymer of chlorofluoroethylene; polytetrafluoroethylene / copolymer of chlorofluoroethylene; polyoxymethylene; Polychloride trifluoroethylene; Polyvinyl chloride; polysulfone; Polyvinylidene fluoride.

    According to the particular embodiment of the figure 1, the fusible sheet 6 is formed by a homogeneous mixture combining 85% to 95% by mass of material particles conductive and 5% to 15% by mass of an energetic material or likely to react with the conductive material.

    We could for example make a fusible sheet with the following compositions:

    Example 1

    85% to 95% by mass of aluminum powder and preferably 90%,
    5% to 15% by mass of a mixture associating polytetrafluoroethylene and copolymer of chlorofluoroethylene, and preferably 10%.

    Example 2

    85% to 95% by mass of magnesium powder and preferably 90%,
    5% to 15% by mass of a mixture associating polytetrafluoroethylene and copolymer of chlorofluoroethylene, and preferably 10%.

    We can concretely make the sheet by mixing metal (aluminum or magnesium) to a solution of polytetrafluoroethylene and chlorofluoroethylene copolymer in a suitable solvent, for example a ketone: cyclohexyl ketone (cyclohexane) or acetone. The mixture as well realized will be applied as a paint on the face end of the axial electrode 5a and of the insulating tube 7. Then the solvent will be evaporated before putting in place the electrode 5a and the insulating tube 7 in the electrode device 5b.

    Component 1 and connected by conductors 21 and 13 to a electric generator 14.

    This generator is designed to be able to deliver energy from 10 kJ to 1 megaJoule in the form of voltage pulses of 1000 volts to 20 kilo Volts. Such a generator is conventional and includes for example capacitors, an inductor, switches (such as thyristors or spark gaps) and a stabilized supply.

    A small fraction of the energy supplied by the generator is used to initiate the fuse sheet 6 by Joule effect. The energetic material is then initiated or else the reaction between the conductive material and the material reactive is initiated. A combustion flame fills the chamber 12 which is constituted by hole 10 and which is delimited by the peripheral electrode 5b.

    This flame is naturally formed of atoms and ionized molecules. It provides electrical conduction of reduced resistance between electrodes 5a and 5b which allows maintaining an electric arc between the electrodes.

    Chamber 12 ensures containment of the arc which allows the development of the plasma generated by the fusible sheet 6.

    This results in a very intense shock wave (combined usually a projection of part of the sheet fuse), which impacts the explosive charge 3 through the hole 11 and initiates it.

    The pressure generated will be all the more important as the volume of chamber 12 will be reduced.

    For example, an ignition component has been made. associating a chamber 12 having a volume of approximately 17 mm 3 and an energy fuse with an effective diameter of 4 mm (diameter of chamber 12), 90 micrometers thick and having as composition any of the compositions described previously (examples 1 or 2).

    Such a component, supplied under a voltage pulse of 1000 Volts with a maximum intensity of 10000 Amps, a ensured the detonation of an 11.5mm explosive relay diameter and 11.5mm high made of hexogen / wax / graphite (proportions by relative masses: 98/2/1). The pressure obtained at the outlet of the component is around 1 Giga pascal (1 GPa).

    We see that the component according to the invention is of a simpler to manufacture than safety components or known slappers since it does not require the construction of a resistive bridge and a projection cannon for a lozenge.

    The diameter of the chamber 12 (between 1 and 4 mm) is higher than that of the guns used in the "slappers" known (whose diameter is generally less than mm).

    The supply voltage is also lower (by around 1000 volts against almost 3000 volts for known "slappers"). This greatly reduces the problems insulation and we therefore facilitate the integration of the component in ammunition or automotive security systems.

    The electrical power consumed is of the same order as in that of known "slappers" (10 Mega Watts), the intensity maximum being also stronger (about 10 kilo Amps).

    The component according to the invention is a component of security since the energy level required for its initiation meets the requirements given by the standards: no pyrotechnic reaction for an impulse of less than 500 volts. It can therefore be used in a device initiation without chain misalignment means pyrotechnic.

    It is possible according to the needs to play on the different dimensions of the component to define a component operating with a voltage lower than 1000 volts. We may thus reduce the thickness of the fusible sheet and / or the volume of the chamber 12 to modify the pressure of plasma therefore generates the power of the component.

    Alternatively, it is possible to replace the fusible sheet shown in Figure 1 (made of formed material of a homogeneous mixture) by a sheet 6 like that shown in Figure 2 which includes a layer 16 of conductive material on which is deposited at least one layer 15 of an energetic material or material capable of react with the conductive material.

    To make such a fuse, for example, spray on a metal sheet a mixture of glue and energetic material or that can react with the material driver.

    Concretely, a fuse comprising a aluminum or magnesium sheet on which is deposited a layer of polytetrafluoroethylene or chloride Polyvinyl.

    The thickness of the metal layer (s) will be around 150 micrometers. That of energetic material will be of the order of 100 micrometers.

    We can also associate a layer of aluminum or magnesium with a layer of nitrocellulose or nitrate Polyvinyl.

    A deposit of copper oxide or of chlorofluoroethylene copolymer on a sheet aluminum or magnesium.

    It will also be possible to deposit a polyoxymethylene on a layer of aluminum.

    In all cases the dimensions of the different layers will be such that 85 to 95% by mass of the material of the conductive layer at 5 to 15% by mass of the or materials of the reactive layer (s).

    According to a preferred embodiment, a fusible sheet by depositing at least one layer of copolymer chlorofluoroethylene (known under the trademark Viton) on a layer of aluminum. The proportions by mass relative will be 90% for aluminum and 10% for chlorofluoroethylene copolymer.

    Figure 3 shows a component according to the invention equipped of a fuse according to figure 2. For the simplification of the figure component 1 has been shown alone without the explosive charge that he must initiate

    The fusible sheet 6 is arranged so that the metal layer 16 is in contact with the front face of the axial electrode 5a.

    The fusible sheet 6 will have a chosen diameter such that the metal layer 16 is also in contact with the internal cylindrical surface 8 of the peripheral electrode 5b.

    The current flow can thus be done through the conductive layer 16 which will ensure by joule effect initiation of the reaction with the energy layer 15 therefore the generation of plasma.

    A component comprising a fuse was thus produced in the form of a sheet comprising a layer of 80 micrometers thick aluminum with a layer of 11 micrometers of chlorofluoroethylene copolymer (known as the Viton registered trademark). The fuse sheet thus produced has a diameter of 8 mm and the component has a chamber 12 volume about 17 mm3.

    This component could initiate an explosive tablet such as previously described in response to a voltage pulse of 1000 volts for a maximum intensity of 10 kilo Amps.

    We also made a geometry component identical to the previous one but whose fusible sheet has a layer of 80 micrometers thick Magnesium with a layer of 11 micrometers of copolymer chlorofluoroethylene

    Finally, we made a component of geometry identical to that of the previous ones but whose fusible sheet comprises a layer of 80 micrometers thick of magnesium bearing a layer of 11 micrometers of polytetrafluoroethylene (known under the Teflon trademark).

    These components have also successfully initiated the explosive tablet described above.

    In order to initiate less sensitive explosives or to configure performance more precisely initiation of the component according to the invention, it is possible to define a component also comprising (as in classic slapper components) a projectable tablet.

    Figure 4 shows such a component 1.

    As in the embodiment of FIG. 3, the component 1 comprises two electrodes 5a and 5b which are connected by a fuse 6.

    The peripheral electrode 5b has an internal housing 8 which receives an insulating tube 7 and the axial electrode 5a. The housing 8 is partially closed by an annular rim 9 of the peripheral electrode.

    The fuse 6 comprises a conductive layer 16 in electrical contact with a front face of the electrode central 5a and with the internal cylindrical surface of the housing 8. This component differs from that of Figure 3 in that a patch 17 is disposed between the annular rim 9 and the fuse. This patch therefore separates the chamber 12 and the fuse sheet 6.

    The patch will be made of an insulating material electrical or covered with an electrical insulating layer. A this arrangement avoids arcing directly between the axial electrode 5a and the pellet. We can for example make the patch in one plastic material such as a polyimide (material known as registered trademark Kapton). We can also carry out the mica or metal tablet (aluminum, titanium or steel). In the case of a metal tablet we will cover this one on its two faces with an insulating material, by example of polytetrafluoroethylene, or a layer of tape insulating adhesive providing a level of electrical insulation suitable (for example at least 1000 volts). Such ribbons insulators generally use an insulating layer of rubber or polyvinyl chloride (PVC).

    We thus produced projectable pellets in steel of 20 to 120 micrometers thick.

    When the current flows through the fuse, the pressure generated by the reaction between the conductive material and the energetic material causes cutting of the pellet and its projection through chamber 12 which thus plays the role of the "canon" of the classic "slapper" components.

    It is therefore not necessary as in slappers known to provide a specific gun component (tube in ceramic in the order of mm in diameter).

    The diameter of the chamber can vary between 1 and 4 mm.

    The skilled person will easily choose the dimensions appropriate to ensure the desired effect. We will be able to especially play on the thickness, so the mass of the pellet, to modify the energy received by the explosive at initiate.

    By way of example, components have been made incorporating a fuse associating a layer of aluminum and a layer of chlorofluoroethylene copolymer (known under the brand Viton deposited) with the respective mass proportions of 90% and 10% (total thickness of the fuse 100 micrometers).

    In each component, a tablet has been placed. project associated with a 2 or 4mm diameter chamber, pellet having a thickness of 40 micrometers for steel or 120 micrometers for Kapton. All components led to the initiation of a tablet 11.5mm x 11.5mm hexogen compressed at 160 MPa.

    The same tests have been successfully conducted using a fuse associating a layer of magnesium and a layer of polytetrafluoroethylene (known under the registered trademark teflon) with the respective mass proportions of 90% and 10%.

    Figure 5 shows a component according to a fourth mode of achievement. This component differs from that according to the figure 3 in that the chamber 12 constitutes an interior housing of which is disposed a pin 18 projectable by the sheet fuse. The pawn has substantially the same volume as the housing and it fills this one entirely. He is returned secured to the component, for example by bonding.

    To avoid short circuits between the axial electrode 5a and the pin, this one will be made of an insulating material electric or in a material covered with an insulator.

    The counter may for example be made of a material plastic such as polytetrafluoroethylene.

    The advantage of such an embodiment is that it generates a shock wave which propagates to the explosive through the solid medium of the pawn. This results in a better energy efficiency and higher efficiency to initiate an insensitive explosive. The diameter of the pawn must in all cases be greater than the critical diameter of the explosive to initiate.

    Figure 6 shows a fifth embodiment of the invention in which the axial electrode 5a, the tube of a insulating material 7 and the peripheral electrode 5b constitute a coaxial cable having a flat end face 19 and an external insulating sheath 20.

    We could for example take a coaxial cable from trade with external diameter 1.5 mm, including a core axial 5a of 0.2 mm in diameter and a peripheral conductor 5b forming a crown 0.2 mm thick. The crown insulator 7 will be approximately 100 micrometers thick.

    The face 19 is cut and rectified.

    The fuse sheet 6 is then produced in the form a layer of plasmagenic material applied to the face end 19.

    We can advantageously choose as material plasmagenic a paint associating a conductive material, such carbon or a metal (aluminum, nickel, copper), with a polymerizable binder such as polyurethane.

    For example, 70% to 90% by mass of aluminum powder with 30% to 10% by mass of polyurethane. We will make a fusible sheet of a few micrometers thick simply by coating the end of the coaxial cable with the material thus produced then drying.

    We can also associate 70% to 90% by mass of powder aluminum, nickel or silver with 30% to 10% by mass of an acrylic resin.

    This embodiment is of implementation extremely simple. It also makes it possible to greatly reduce the level of energy required for initiation. This level can thus be of the order of a few tens of Joules.

    The initiator cable will be made integral with the load at initiate by an appropriate means of connection for example a threaded cable clamp which will be screwed onto the casing of the charge next to the explosive charge.

    Claims (27)

    1. Safety ignition component (1) comprising at least two electrodes (5a, 5b) connected by a fuse (6), component characterized in that the fuse (6) is produced in the form of a sheet of material plasmagenic ie a material providing gases at high temperature (greater than 15000 K) and having a high electronic density (greater than 10 18 electrons / cm3) when it is traversed by an electric current of at least 5000 amps .
    2. Safety initiating component according to claim 1, characterized in that the material of the fuse (6) comprises at least one conductive material associated with at least one energetic material or capable of reacting with the conductive material.
    3. Safety initiating component according to claim 2, characterized in that the conductive material consists of carbon or a metal.
    4. Safety initiating component according to one of claims 2 or 3, characterized in that the energetic material or material capable of reacting with the conductive material is chosen from the following compounds or compositions:
      Copper oxide; polytetrafluoroethylene; chlorofluoroethylene copolymer; polytetrafluoroethylene / chlorofluoroethylene copolymer; Magnesium / polytetrafluoroethylene / chlorofluoroethylene copolymer; Boron / Potassium nitrate; plasticized nitrocellulose film or film; polyvinyl nitrate; polyoxymethylene; Trifluoroethylene polychloride; polyvinyl chloride; Trifluoroethylene polychloride; polysulfone; polyvinylidene fluoride.
    5. Safety initiating component according to one of Claims 2 to 4, characterized in that the fusible sheet (6) is formed by a homogeneous mixture associating 85% to 95% by mass of particles of conductive material and from 5% to 15% in mass of an energetic material or else capable of reacting with the conductive material.
    6. Safety initiating component according to claim 5, characterized in that the fusible sheet (6) has the composition:
      85% to 95% by mass of aluminum or magnesium powder,
      5% to 15% by mass of a composition combining polytetrafluoroethylene and chlorofluoroethylene copolymer.
    7. Safety initiating component according to claim 6, characterized in that the fusible sheet (6) has the composition:
      90% by mass of aluminum powder,
      10% by mass of a composition combining polytetrafluoroethylene and chlorofluoroethylene copolymer.
    8. Safety initiating component according to claim 6, characterized in that the fusible sheet (6) has the composition:
      90% by mass of magnesium powder,
      10% by mass of a composition combining polytetrafluoroethylene and chlorofluoroethylene copolymer.
    9. Safety initiating component according to one of claims 2 to 4, characterized in that the fusible sheet (6) comprises at least one layer (15) of energetic material or material capable of reacting with the conductive material deposited on at least part a layer (16) of conductive material.
    10. Safety ignition component according to claim 9, characterized in that the fuse (6) comprises at least one conductive layer (16) of aluminum or magnesium on which is deposited at least one reactive layer (15) of polytetrafluoroethylene, or nitrocellulose or polyvinyl nitrate, or copper oxide or copolymer of chlorofluoroethylene, or polyoxymethylene, or trifluoroethylene polychloride, or polysulfone, or polyvinylidene fluoride.
    11. Safety boot component according to claim 10, characterized in that the dimensions of the different layers are such that 85 to 95% by mass of the material of the conductive layer is combined with 5 to 15% by mass of the material or materials of the reactive layer (s).
    12. Safety ignition component according to claim 11, characterized in that the fuse (6) comprises at least one layer (16) of aluminum and at least one layer (15) of chlorofluoroethylene copolymer.
    13. Safety ignition component according to claim 11, characterized in that the fuse (6) comprises at least one layer of magnesium and at least one layer of chlorofluoroethylene copolymer.
    14. Safety ignition component according to claim 11, characterized in that the fuse (6) comprises at least one layer of magnesium and at least one layer of polytetrafluoroethylene.
    15. Safety initiating component according to one of Claims 1 to 14, characterized in that it comprises an axial electrode (5a) surrounded by a tube (7) of an insulating material itself surrounded by a peripheral electrode (5b) , the fusible sheet (6) being applied in abutment on an end face (22) of the axial electrode (5a) and also being in contact with an annular part (9) of the peripheral electrode (5b).
    16. Safety initiating component according to claim 15, characterized in that it comprises a chamber (12) for developing the plasma, a chamber separated from at least one electrode by the fusible sheet (6).
    17. Safety initiating component according to claim 16, characterized in that the chamber (12) is delimited by the peripheral electrode (5b).
    18. Safety initiating component according to one of claims 16 or 17, characterized in that it also comprises a tablet (17) projectable through the chamber (12), tablet (17) disposed between the chamber (12) and the sheet fuse (6).
    19. Safety initiating component according to claim 18, characterized in that the patch (17) is made of an electrical insulating material or covered with an electrical insulating layer.
    20. Safety initiating component according to claim 19, characterized in that the patch (17) has a diameter between 1 mm and 4 mm and a thickness between 20 and 200 micrometers.
    21. Safety initiating component according to claim 15, characterized in that it comprises a housing (12) separated from at least one electrode by the fusible sheet (6), housing inside which is arranged a pin (18 ) projectable by the fusible sheet (6).
    22. Safety initiating component according to claim 21, characterized in that the pin (18) has substantially the same volume as the housing (12).
    23. Safety initiating component according to claim 22, characterized in that the housing (12) is delimited by the peripheral electrode (5b) and in that the pin (18) is made of an electrically insulating material or covered with an electrical insulating layer.
    24. Safety initiating component according to claim 15, characterized in that the axial electrode (5a), the tube (7) of an insulating material and the peripheral electrode (5b) constitute a coaxial cable having a face of planar end (19), and in that the fusible sheet (6) is produced in the form of a layer of plasmagenic material applied to the end face (19).
    25. Safety initiating component according to claim 24, characterized in that the layer of plasmagenic material consists of a paint associating a conductive material with a polymerizable binder.
    26. Safety initiating component according to claim 25, characterized in that the layer of plasmagenic material comprises 70% to 90% by mass of aluminum, nickel or silver powder with 30% to 10% by mass of an acrylic resin.
    27. Safety initiating component according to claim 25, characterized in that the layer of plasmagenic material comprises 70% to 90% by mass of aluminum powder, with 30% to 10% by mass of polyurethane.
    EP20030291268 2002-05-29 2003-05-27 Safety initiator Active EP1367356B1 (en)

    Priority Applications (2)

    Application Number Priority Date Filing Date Title
    FR0206590A FR2840400B1 (en) 2002-05-29 2002-05-29 Safety primer component
    FR0206590 2002-05-29

    Publications (2)

    Publication Number Publication Date
    EP1367356A1 true EP1367356A1 (en) 2003-12-03
    EP1367356B1 EP1367356B1 (en) 2008-09-03

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP20030291268 Active EP1367356B1 (en) 2002-05-29 2003-05-27 Safety initiator

    Country Status (4)

    Country Link
    EP (1) EP1367356B1 (en)
    AT (1) AT407339T (en)
    DE (1) DE60323294D1 (en)
    FR (1) FR2840400B1 (en)

    Citations (6)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    GB2100395A (en) * 1981-06-15 1982-12-22 Secr Defence Pyrotechnic devices
    EP0488863A1 (en) * 1990-11-27 1992-06-03 Thomson-Brandt Armements Pyrotechnic detonator with coaxial connections
    US5370053A (en) * 1993-01-15 1994-12-06 Magnavox Electronic Systems Company Slapper detonator
    US6234081B1 (en) * 1999-03-19 2001-05-22 Eg&G, Inc. Shaped bridge slapper
    WO2001039586A2 (en) * 1999-10-27 2001-06-07 Talley Defense Systems, Inc. Heat transfer delay
    US6327978B1 (en) * 1995-12-08 2001-12-11 Kaman Aerospace Corporation Exploding thin film bridge fracturing fragment detonator

    Patent Citations (6)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    GB2100395A (en) * 1981-06-15 1982-12-22 Secr Defence Pyrotechnic devices
    EP0488863A1 (en) * 1990-11-27 1992-06-03 Thomson-Brandt Armements Pyrotechnic detonator with coaxial connections
    US5370053A (en) * 1993-01-15 1994-12-06 Magnavox Electronic Systems Company Slapper detonator
    US6327978B1 (en) * 1995-12-08 2001-12-11 Kaman Aerospace Corporation Exploding thin film bridge fracturing fragment detonator
    US6234081B1 (en) * 1999-03-19 2001-05-22 Eg&G, Inc. Shaped bridge slapper
    WO2001039586A2 (en) * 1999-10-27 2001-06-07 Talley Defense Systems, Inc. Heat transfer delay

    Also Published As

    Publication number Publication date
    AT407339T (en) 2008-09-15
    FR2840400A1 (en) 2003-12-05
    FR2840400B1 (en) 2004-07-16
    DE60323294D1 (en) 2008-10-16
    EP1367356B1 (en) 2008-09-03

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