EP2827093A1 - Zündervorrichtung - Google Patents

Zündervorrichtung Download PDF

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Publication number
EP2827093A1
EP2827093A1 EP13275166.0A EP13275166A EP2827093A1 EP 2827093 A1 EP2827093 A1 EP 2827093A1 EP 13275166 A EP13275166 A EP 13275166A EP 2827093 A1 EP2827093 A1 EP 2827093A1
Authority
EP
European Patent Office
Prior art keywords
synthetic polymer
energetic material
polymer layer
igniter
layer
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.)
Ceased
Application number
EP13275166.0A
Other languages
English (en)
French (fr)
Inventor
designation of the inventor has not yet been filed The
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.)
BAE Systems PLC
Original Assignee
BAE Systems PLC
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 BAE Systems PLC filed Critical BAE Systems PLC
Priority to EP13275166.0A priority Critical patent/EP2827093A1/de
Priority to US14/905,395 priority patent/US10088289B2/en
Priority to EP14742303.2A priority patent/EP3022520B1/de
Priority to PCT/GB2014/052137 priority patent/WO2015008045A1/en
Priority to AU2014291864A priority patent/AU2014291864A1/en
Publication of EP2827093A1 publication Critical patent/EP2827093A1/de
Priority to IL243617A priority patent/IL243617B/en
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C19/00—Details of fuzes
    • F42C19/08—Primers; Detonators
    • F42C19/0815—Intermediate ignition capsules, i.e. self-contained primary pyrotechnic module transmitting the initial firing signal to the secondary explosive, e.g. using electric, radio frequency, optical or percussion signals to the secondary explosive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C19/00—Details of fuzes
    • F42C19/08—Primers; Detonators
    • F42C19/0823—Primers or igniters for the initiation or the propellant charge in a cartridged ammunition

Definitions

  • the invention relates to an igniter device for igniting energetic materials, more specifically to the area of the initiation of munitions, and methods of forming said ignition devices.
  • an explosive train sequence may comprise a primer, an igniter with intermediate explosive and an output charge such as, for example a propellant.
  • the explosive train serves to take a small energetic event and amplify the output as it moves through the explosive train, meaning a primer is typically a small amount of highly sensitive material contained within an item such as, for example a percussion cap allowing ignition via an explosive train to initiate an intermediate, such as gunpowder which in turn sets of the energetic propellant formulation which is typically a larger volume of material which takes a larger input stimulus to initiate.
  • igniters for use in conventional base ignited propelling charge currently requires pouring a set quantity of energetic material into pre-machined cotton primer bags, which are then hand sewn to encase the energetic material.
  • Hand sewing is considered a requirement as faster methods such as machine sewing or stapling present a risk of initiating the material and may not provide an adequate seal to contain the energetic material.
  • an igniter device for use in an explosive train, comprising a first synthetic polymer layer, a second synthetic polymer layer, wherein said first layer and second layer envelope a portion of an energetic material, wherein said polymers are capable of being sealed; such that said first and second layers are sealed together.
  • a synthetic polymer layer is considered to be a man-made polymer, such as, for example thermoplastics or thermosets.
  • the term layer maybe a sheet of said synthetic polymer, whether it is in the form of a flat, unmoulded synthetic polymer sheet or a preformed synthetic polymer sheet.
  • a single sheet of polymer may be is folded over on itself to an edge in order for the seal to take effect and provide a first and second layer so as to prevent the escape of energetic material.
  • the energetic material maybe a material such as a pyrotechnic, propellant or high explosive composition, however for ignition it is preferable that the energetic material is a propellant or pyrotechnic.
  • prior art cotton primer bags presents a number of issues. Firstly the process requires the construction and filling of cotton pouches, which is costly in terms of time. Secondly the sealing of the pouches requires hand sewing, increasing the workload on people and the time of production and finally the cotton primer bags are of set dimensions with no devices included to separate the energetic material location within the cotton primer bag. This potentially means that the energetic material may disperse, during transport, to one area of the cotton primer bag leading to an inefficient burn or even failure to cause initiation.
  • a synthetic polymer allows greater control and flexibility over the igniter device's shape, and speeds up the process of manufacture by providing mechanised methods of sealing the ignition device compared to hand sewing.
  • the seal is caused by the application of pressure, heat, or UV, though mechanical fastenings or an adhesive may be used in combination, although certain adhesives can cause compatibility problems with certain energetic materials and are preferably avoided.
  • the synthetic polymer material 'self-seals' when caused to flow or partially melt by the application of heat, UV or pressure, the seal is created when the fused first and second layers re solidify.
  • igniter device to be adapted to its requirements by shaping the synthetic polymer to form the layers required, such as for a base pad igniter or wrapping a sheet version of the igniter device into a cylindrical central core igniter shape to fit within a propellant charge central cavity or, a replacement to metal primer designs for metal cartridges.
  • the energetic material may be prevented from moving within the envelope to ensure more consistent distribution in the final device. This may be achieved by preferably providing at least one separator structure, to provide at least two segments once the device is sealed. This will prevent the energetic material from collecting in one area of the device if it is moved and may allow for a more uniform dispersion of the explosive energy output. Further to this, the inclusion of a separator structure provides the opportunity to use more than one energetic material within the same ignition device, potentially adding an additional step in the explosive train sequence. This may make the primer more adaptable for use in munitions requiring a different explosive train sequence.
  • the energetic material may be prevented from dispersing by vacuum packing, such that the igniter device may be sealed under vacuum such that there are no air gaps and the synthetic polymer grips or retains the energetic material.
  • the separation of the energetic material may preferably be achieved by the use of at least one polymer separator structure separator structure, or during the manufacturing process by utilising the advantage of sealing or crimping the igniter device at areas throughout the device, such that at least one of the first or second synthetic polymer layers forms a separator structure during the sealing process.
  • Separator structures separate the energetic material and they may also provide the igniter device with a more rigid structure. As a result the separation structures may be internal, or where reinforcement only is required splines or rigid members may be mounted externally to the igniter device; or both if required.
  • the device may comprise a plurality of through holes where there is a clear hole from one side of the device through to the other. This provides a number of areas which will provide paths for thermal output and flame propagation, allowing the device to utilise the areas created by the separator structures or through holes to ensure an even ignition of the next energetic material.
  • the igniter device synthetic polymer layers may be produced as one or more preformed synthetic polymer sheets. This may allow a faster method of construction by using a preformed synthetic polymer sheet containing a recess as part of the first layer and enveloping the energetic material with a synthetic polymer sheet to create a second layer or by using a preformed synthetic polymer sheet to create the second layer. Once the energetic material has been enveloped between the first and second layers the synthetic polymer sheets may be sealed together.
  • the first synthetic polymer layer may be prepared as a preformed shape, such that it is formed into a 3 dimensional shape, such as, for example to be able to adopt to the shape of an internal cavity within a munition or to provide a pocket, or recess in which the energetic material is located.
  • the second synthetic polymer layer may simply be in the form of a sheet and sealed to form the final igniter device.
  • both the first and second synthetic polymer layers may be selected from preformed shapes, which may be slotted together leaving a void which can be filled with energetic material, the void may be filled via a fill portal and may be joined via a sealable joining seam, or the fill portal may be the sealable joining seam.
  • first or second synthetic polymer layer and/or separator structures may provide a degree of rigidity, which may provide structural support for the energetic materials within the munition.
  • a method of forming an igniter device as defined herein comprising the steps of preparing a synthetic polymer layer and adding an energetic material onto the synthetic polymer layer and folding said synthetic polymer layer over itself, such as to form first and second synthetic polymer layers that the said energetic material is enveloped inside the first synthetic polymer layer and sealing said synthetic polymer layers, such that the said energetic material is enveloped.
  • a method of forming an igniter device as defined herein comprising the steps of preparing a first synthetic polymer layer and adding an energetic material onto a first synthetic polymer layer and enveloping said energetic material with a second synthetic polymer layer, sealing the said first and second synthetic polymer layers, such that the said energetic material is enveloped.
  • at least one of the first or second layers are preformed into a final configuration.
  • Fig 1a shows the device 5a with a synthetic polymer sheet 2 providing the first synthetic polymer layer 4 with an energetic material 3 encased between the first synthetic polymer layer 4 and a second synthetic polymer sheet 2a, which makes up the second synthetic polymer layer 4a, wherein said layers of synthetic polymer 4, 4a are sealed 1 together by application of heat, pressure or UV.
  • Fig 1b shows an alternative embodiment of the igniter device as a cross section 5b where a single sheet of synthetic polymer 6 has been used to create a first synthetic polymer layer 4c, but has been wrapped over itself to encase the energetic material 3 and to be sealed 1b at an edge, giving it both a first layer 4c and a second synthetic polymer layer 4b.
  • a sealed edge 1b is created at one side of the igniter device and a fold 8 is present at the other.
  • Fig 1c shows an embodiment of the device 5c where the first synthetic polymer layer 4e is preformed 7 and contains the energetic material 3.
  • a second synthetic polymer layer 4d is placed on top to cover and is sealed 1c.
  • the energetic material 13 is encased between two synthetic polymer sheets as shown in Fig 2a, 2b and 2c .
  • the synthetic polymer sheet is shown in both a flat sheet embodiment 14 and a cylindrical form 12. In the cylindrical form the centre remains hollow and the outer synthetic polymer layer is rigid and may be inserted into a propellant cavity.
  • the synthetic polymer sheet 24 has been manufactured in the form of a circle, consisting of two layers 22, 22a, with the energetic material 23 encased between the layers 22, 22a.
  • the separator structures 28 can be seen dividing the energetic material into four segments and can contain energetic material if required and provides rigidity to the base pad igniter device 27.
  • a base pad igniter 30 which consists of two separate areas of different energetic materials 33, 33a. This configuration allows two energetic materials 33, 33a to be arranged in a base pad igniter to control the output of the explosive train.
  • FIG 5 there is an igniter device 40 with two types of energetic material 43, 43a stacked on top of each other, though further energetic materials may be included if required.
  • the separator structures 48 divide the energetic material into four segments; again additional segments may be created by including further separator structures or by sealing the device at desired locations.
  • the separator structures 48, 48a in this embodiment have an added advantage of providing a more rigid structure for the igniter device.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
EP13275166.0A 2013-07-16 2013-07-16 Zündervorrichtung Ceased EP2827093A1 (de)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP13275166.0A EP2827093A1 (de) 2013-07-16 2013-07-16 Zündervorrichtung
US14/905,395 US10088289B2 (en) 2013-07-16 2014-07-14 Igniter device
EP14742303.2A EP3022520B1 (de) 2013-07-16 2014-07-14 Zündervorrichtung
PCT/GB2014/052137 WO2015008045A1 (en) 2013-07-16 2014-07-14 Igniter device
AU2014291864A AU2014291864A1 (en) 2013-07-16 2014-07-14 Igniter device
IL243617A IL243617B (en) 2013-07-16 2016-01-14 Igniter device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13275166.0A EP2827093A1 (de) 2013-07-16 2013-07-16 Zündervorrichtung

Publications (1)

Publication Number Publication Date
EP2827093A1 true EP2827093A1 (de) 2015-01-21

Family

ID=48803484

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13275166.0A Ceased EP2827093A1 (de) 2013-07-16 2013-07-16 Zündervorrichtung

Country Status (1)

Country Link
EP (1) EP2827093A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3224373A (en) * 1963-05-01 1965-12-21 Aerojet General Co Igniter device for solid body of pyrotechnic material
US5063848A (en) * 1990-10-16 1991-11-12 Olin Corporation Igniter bag
FR2725781A1 (fr) * 1994-10-18 1996-04-19 Giat Ind Sa Materiau d'allumage pour charge propulsive et systeme d'allumage ou tube allumeur mettant en oeuvre un tel materiau

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3224373A (en) * 1963-05-01 1965-12-21 Aerojet General Co Igniter device for solid body of pyrotechnic material
US5063848A (en) * 1990-10-16 1991-11-12 Olin Corporation Igniter bag
FR2725781A1 (fr) * 1994-10-18 1996-04-19 Giat Ind Sa Materiau d'allumage pour charge propulsive et systeme d'allumage ou tube allumeur mettant en oeuvre un tel materiau

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