CA2169415A1 - Reduced blunt trauma body armour - Google Patents
Reduced blunt trauma body armourInfo
- Publication number
- CA2169415A1 CA2169415A1 CA 2169415 CA2169415A CA2169415A1 CA 2169415 A1 CA2169415 A1 CA 2169415A1 CA 2169415 CA2169415 CA 2169415 CA 2169415 A CA2169415 A CA 2169415A CA 2169415 A1 CA2169415 A1 CA 2169415A1
- Authority
- CA
- Canada
- Prior art keywords
- ballistic material
- closely
- trauma
- ballistic
- uni
- 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.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
- F41H5/00—Armour; Armour plates
- F41H5/02—Plate construction
- F41H5/04—Plate construction composed of more than one layer
- F41H5/0471—Layered armour containing fibre- or fabric-reinforced layers
Landscapes
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
Abstract
The reduced blunt trauma soft body armour of the present invention includes a first ballistic material packet overlaid by a second ballistic material packet, and means for reduction of blunt trauma interleaved between the first and second ballistic material packets, wherein the means for reduction of blunt trauma includes a layer of reduced density material for maintaining an air gap between the first and second ballistic material packets when worn by a user.
Description
2 1 6~4 1 5 , REDUCED BLUNT TRAUMA BODY ARMOUR
Field of the Invention This application relates to soft body armour in which reduced blunt trauma is obtained by combining a uni-directional aramid ballistic material in an interleaved configuration forming two packets of interleaved ballistic materials, one on either side of a needle punched ballistic felt layer.
0 Backyround of the Invention When a bullet strikes a vest, a certain amount of energy passes through it depending on the size of the bullet, its velocity and other factors. This phenomenon is referred to as "blunt trauma".
When testing for blunt trauma, armour panels are strapped onto a clay-filled box.
When the bullet strikes the panel, the bullet's energy is primarily dissipated along the panel's fibres. As illustrated in Figure 1, the residual energy is transmitted through the panel. The dent or "backface signature" in the calibrated clay block records the energy transmitted through the 2 o panel and is indicative of the blunt trauma the wearer of the vest would receive.
The National Institute of Justice (NIJ) standard 0101.03 stipulates the backfacesignature in calibrated clay cannot exceed 44 mm in depth at any threat level.
2 5 This means the chances of life lhl~eale~ g injuries being caused by blunt trauma are kept to a minimum as long as the back face ~ign~tllre is less than the 44 mm limit.
- ~ ' :~'' .;
2i69415 -The specification applied by Japanese authorities is however, more demanding in that acceptable soft body armour will be limited to a backface signature of less than 20 mm. In addition, the Japanese specification calls for defeating 7.62 mm Tokarev steeljacketed rounds which have measured projectile velocities of approximately 480 metres per second.
Needle punched felt, such as FragliteTM made by DSM Dutch State Mines, Netherlands, or needle punched SpectraTM felt made by Allied Signals, is conventionally used in the construction of anti-fragmentation vests. These materials are typically 2 mm per layer, having a density of 200 gm/m2.
Summary of the Invention The reduced blunt trauma soft body armour of the present invention includes a first ballistic material packet overlaid by a second ballistic material packet, and means for reduction of blunt trauma such as a layer of reduced density material (as compared to the first and second ballistic material packets) interleaved between the first and second ballistic material packets, wherein the means for reduction of blunt trauma includes air gap means for m~int~ining an air gap or otherwise introduces a layer of changed impedance between the first and second ballistic material packets when worn by a user.
Advantageously, the first ballistic m~terisll packet is for releasable wearing by a user, and is suspended in a position most closely adjacent to the user. In a first aspect, the first ballistic material packet includes at Ieast rour closely overlaid sheets Or uni-dircctiollal aral~
fibre ballistic material, the layer of blunt trauma reduction material includes three closely overlaid 2 5 sheets of anti-trauma felt, and the second ballistic material packet includes 26 closely overlaid sheets of uni-directional aramid fibre ballistic material.
216~415 .
In a seeond aspeet, the first ballistie material paeket ineludes at least five elosely overlaid sheets of uni-directional aramid fibre ballistic material, the layer of blunt trauma reduetion material includes three closely overlaid sheets of anti-trauma felt, and the second ballistic material packet 24 closely overlaid sheets of uni-directional aramid fibre ballistic material.
In a third aspect, the first ballistic material paeket includes at least four closely overlaid sheets of uni-directional aramid fibre ballistie material, the layer of blunt trauma reduetion material ineludes two elosely overlaid sheets of anti-trauma felt, and the second ballistic material packet includes 26 closely overlaid sheets of uni-directional aramid fibre ballistic material.
In a fourth aspect, the first ballistie material paeket ineludes at least five elosely overlaid sheets of uni-direetional aramid fibre ballistic material, the layer of blunt trauma reduction material includes two closely overlaid sheets of anti-trauma felt, and lhe second ballistic material packet includes 24 elosely overlaid sheets of uni-directional aramid fibre ballistic material.
In a fifth aspeet, first ballistie m~t~ri~l paeket ineludes at least four elosely overlaid sheets of uni-direetional aramid fibre ballistie material, the layer of blunt trauma reduction material comprises four closely overlaid sheets of anti-trauma felt, and the second ballistic material packet ineludes 26 elosely overlaid sheets of uni-direetional aramid fibre ballistic material.
In a sixth aspect, the first ballistie material paeket ineludes at least five closely overlaid sheets of uni-direetional aramid fibre ballistie material, the layer of blunt trauma reduetion material ineludes four elosely overlaid sheets of anti-trauma felt, and the seeond ballistic ~ ~ .
2169~15 material packet includes 24 closely overlaid sheets of uni-directional aramid fibre ballistic material.
ln all aspects, the uni-directional aramid fibre ballistic material may be SpectrAmidTM, and the anti-trauma felt may be FragliteTM, and the armour has an areal density of less than 2 pounds per square foot.
E~rief Description of the Drawin~s 0 Figure l illustrates how the energy of a ballistic round causes blunt trauma as a ballistic round penetrates the soft body armour of the present invention.
Detailed Description of the Preferred Embodiment In Applicant's experience, it is desirable to have soft body armour designed to defeat rounds having approximately 30 metres per second higher V50 velocities (as hereinafter defined) than that required by the testing specification.
In the preferred embodiment, in order to meet the more stringent Japanese testing 2 o specification, Applicant has used both uni-directional aramid ballistic material such as SpectrAmidTM marketed by Allied Signal, and felt SpectraTM anti-trauma material such as FragliteTM also marketed by Allied Signal.
Applicant has recognized the advantage of using an air gap principle, that is, two 2 5 separate packets of interleaved ballistic material which when placed back to back acts to better defeat a ballistic round than a single packet having the equivalent number of interleaved layers of ballistic material. This air gap principle, it was recognized, would also apply if the packets were placed on either side of a layer of FragliteTM, or SpectraTM felt, the underlying principle being the 2169~15 introduction of a layer of reduced density so as to change the impedance between the ballistic packets. lt was determined that the air gap principle using FragliteTM would both reduce the blunt trauma and defeat a high velocity round such as a Tokarev steeljacketed round, if the front packet of interleaved ballistic material was lelt surl;ciently cohesive to acl as a cohesive l~allistic resislalll unit. Thus, within a stack of thirty plies of SpectrAmidTM material, if the FragliteTM layer was inserted between the fourth and fifth layers up from the bottom (which would correspond to a layer between the fourth and fifth layers from the back i.e. closest to the wearer of the body armour) that high velocity rounds were consistently stopped, and that the mushrooming of the rounds was consistent, as the rounds penetrated into the front ballistic packet (i.e. the packet 0 furthest from the wearer of the body armour, having 26 plies of SpectrAmidTM). Thus, FragliteTM
or SpectraTM felt (hereinafter collectively FragliteTM or anti-trauma felt) was used as an anti-trauma felt rather than as an anti-fragmentary felt. Other layers of reduced density may include the use of a resilient honeycomb material or, for example, a light rubber (or the like) layer.
In testing the soft body armour of the present invention, a ballistic performance indicator known in the industry as "V50" testing was also used as a means of evaluation. VS0 testing is for ballistic performance as opposed to blunt trauma performance. In the past, testing for ballistic performance meant merely a pass/fail indication as to whether a ballistic round was defeated or not by the test specimen. In V50 testing, ballistic rounds having high ballistic 2 o velocities (to ensure complete penetration of the test specimen) are deliberately used first. The ballistic velocity ofthe rounds is then incremented dowllw~ds in increments of 50 or l00 feet per second until a partial penetration of the test specimen is obtained. At that point, the ballistic velocity of the rounds is once again increased in the same increments until complete pcnetratioll is once again obtained. In this manner, the edge of the testing envelope between partial 2 5 penetrations and complete penetrations of the test specimen results in, advantageously after four complete penetrations and four partial penetrations and incrementing therebetween, the V50 average ballistic velocity can then be calculated for the test specimen.
: ~ , - ~ ;. ' 216q415 -V50 testing was successfully completed on a test specimen, as described above and diagramatically illustrated in Figure I (number of layers not accurately depicted), having four layers of SpectrAmidTM in the ballistic material packet closest to the body of the user (the back packet I ), 26 layers of SpectrAmidl M in the packet of ballistic material ~`urthest from the body of the user (the front packet 2), and interleaved in between an anti-trauma layer 3 of three sheets of FragliteTM felt. This configuration had an approximate areal density of 1.81 pounds per square foot. Ballistic rounds 4 according to the Japanese specification were generally defeated in the front packet with no penetrations, and the backface signature did not exceed a 20 mm dent in the calibrated clay bed 5. The energy from ballistic round 4 causing the backface signature 6 in clay 0 bed 5 is shown as lines of radiated energy from round 4.
V50 testing of a similar configuration having one less sheet of SpectrAmidTM (i.e.
5:3:24 SpectrAmidTM (back packet):FragliteTM:SpectrAmidTM (front packet)) was successful so long as test rounds fired at the test specimen were not placed so as to impact strands of aramid Iying on the same axis, i.e., the rounds were scattered about the specimen so that no two rounds impacted the same aramid strands. Even with faulty test procedure where more than one round was allowed to impact the same stands of aramid, V50 testing was almost successfully completed and blunt trauma was only slightly greater than the Japanese specification limit of 20 mm backface signature.
For the soft body armour of the present invention to defeat other threat levels than the threat level corresponding to the Japanese specification, layers of SpectrAmidTM would be added or removed as required from the front packet of ballistic material, i.e. that l-acket havin~
the larger number of layers of ballistic material.
Testing results are incorporated herewith as Tables 1, 2 and 3. V50 testing in Table 1 indicated a V50 average ballistic velocity of 509.5 metres per second. Table 2 was not V50 testing, but merely confirmed that the 4:3:26 configuration of SpectrAmidTM (back .
~ ~ , ', ,. ~' .
packet):FragliteTM:SpectrAmidTM (front packet) would defeat ballistic round velocities of 450 metres per second. Testing in Table 3 was V50 testing and, similar to Table l, conflrmed a V50 average ballistic velocity of SlO metres per second for the 4:3:26 SpectrAmidTM (back packet):FragliteTM:SpeclrAmidTM (front packet) soft body armour.
It was further determined that the areal density in the above SpectrAmidTM/FragliteTM combination was improved over the areal density of a similar configuration in which the three sheets of FragliteTM were replaced with 0.25 inches of anti-trauma foam. The ballistic panel with the anti-trauma foam layer had an areal density of greater than two pounds per square foot. The SpectrAmidTM/FragliteTM combination also exhibited decreased volume and improved flexibility as compared to ballistic panels that presently meet the Japanese specifications.
It is thought by Applicant that because the aramid strands within the SpectrAmidTM
ballistic material have high melting temperatures, that there is a reduction in the loss of performance of the ballistic material for steeljacketed rounds which have higher temperatures as opposed to copperjacketed rounds.
As will be al)pal~ll to those skilled in the art in the light of the foregoing disclosure, many alterations and modifications are possible in the practice of this invention without departing from the spirit or scope thereof. Accordingly, the scope of the invention is to be construed in accordance with the substance defined by the following claims.
Field of the Invention This application relates to soft body armour in which reduced blunt trauma is obtained by combining a uni-directional aramid ballistic material in an interleaved configuration forming two packets of interleaved ballistic materials, one on either side of a needle punched ballistic felt layer.
0 Backyround of the Invention When a bullet strikes a vest, a certain amount of energy passes through it depending on the size of the bullet, its velocity and other factors. This phenomenon is referred to as "blunt trauma".
When testing for blunt trauma, armour panels are strapped onto a clay-filled box.
When the bullet strikes the panel, the bullet's energy is primarily dissipated along the panel's fibres. As illustrated in Figure 1, the residual energy is transmitted through the panel. The dent or "backface signature" in the calibrated clay block records the energy transmitted through the 2 o panel and is indicative of the blunt trauma the wearer of the vest would receive.
The National Institute of Justice (NIJ) standard 0101.03 stipulates the backfacesignature in calibrated clay cannot exceed 44 mm in depth at any threat level.
2 5 This means the chances of life lhl~eale~ g injuries being caused by blunt trauma are kept to a minimum as long as the back face ~ign~tllre is less than the 44 mm limit.
- ~ ' :~'' .;
2i69415 -The specification applied by Japanese authorities is however, more demanding in that acceptable soft body armour will be limited to a backface signature of less than 20 mm. In addition, the Japanese specification calls for defeating 7.62 mm Tokarev steeljacketed rounds which have measured projectile velocities of approximately 480 metres per second.
Needle punched felt, such as FragliteTM made by DSM Dutch State Mines, Netherlands, or needle punched SpectraTM felt made by Allied Signals, is conventionally used in the construction of anti-fragmentation vests. These materials are typically 2 mm per layer, having a density of 200 gm/m2.
Summary of the Invention The reduced blunt trauma soft body armour of the present invention includes a first ballistic material packet overlaid by a second ballistic material packet, and means for reduction of blunt trauma such as a layer of reduced density material (as compared to the first and second ballistic material packets) interleaved between the first and second ballistic material packets, wherein the means for reduction of blunt trauma includes air gap means for m~int~ining an air gap or otherwise introduces a layer of changed impedance between the first and second ballistic material packets when worn by a user.
Advantageously, the first ballistic m~terisll packet is for releasable wearing by a user, and is suspended in a position most closely adjacent to the user. In a first aspect, the first ballistic material packet includes at Ieast rour closely overlaid sheets Or uni-dircctiollal aral~
fibre ballistic material, the layer of blunt trauma reduction material includes three closely overlaid 2 5 sheets of anti-trauma felt, and the second ballistic material packet includes 26 closely overlaid sheets of uni-directional aramid fibre ballistic material.
216~415 .
In a seeond aspeet, the first ballistie material paeket ineludes at least five elosely overlaid sheets of uni-directional aramid fibre ballistic material, the layer of blunt trauma reduetion material includes three closely overlaid sheets of anti-trauma felt, and the second ballistic material packet 24 closely overlaid sheets of uni-directional aramid fibre ballistic material.
In a third aspect, the first ballistic material paeket includes at least four closely overlaid sheets of uni-directional aramid fibre ballistie material, the layer of blunt trauma reduetion material ineludes two elosely overlaid sheets of anti-trauma felt, and the second ballistic material packet includes 26 closely overlaid sheets of uni-directional aramid fibre ballistic material.
In a fourth aspect, the first ballistie material paeket ineludes at least five elosely overlaid sheets of uni-direetional aramid fibre ballistic material, the layer of blunt trauma reduction material includes two closely overlaid sheets of anti-trauma felt, and lhe second ballistic material packet includes 24 elosely overlaid sheets of uni-directional aramid fibre ballistic material.
In a fifth aspeet, first ballistie m~t~ri~l paeket ineludes at least four elosely overlaid sheets of uni-direetional aramid fibre ballistie material, the layer of blunt trauma reduction material comprises four closely overlaid sheets of anti-trauma felt, and the second ballistic material packet ineludes 26 elosely overlaid sheets of uni-direetional aramid fibre ballistic material.
In a sixth aspect, the first ballistie material paeket ineludes at least five closely overlaid sheets of uni-direetional aramid fibre ballistie material, the layer of blunt trauma reduetion material ineludes four elosely overlaid sheets of anti-trauma felt, and the seeond ballistic ~ ~ .
2169~15 material packet includes 24 closely overlaid sheets of uni-directional aramid fibre ballistic material.
ln all aspects, the uni-directional aramid fibre ballistic material may be SpectrAmidTM, and the anti-trauma felt may be FragliteTM, and the armour has an areal density of less than 2 pounds per square foot.
E~rief Description of the Drawin~s 0 Figure l illustrates how the energy of a ballistic round causes blunt trauma as a ballistic round penetrates the soft body armour of the present invention.
Detailed Description of the Preferred Embodiment In Applicant's experience, it is desirable to have soft body armour designed to defeat rounds having approximately 30 metres per second higher V50 velocities (as hereinafter defined) than that required by the testing specification.
In the preferred embodiment, in order to meet the more stringent Japanese testing 2 o specification, Applicant has used both uni-directional aramid ballistic material such as SpectrAmidTM marketed by Allied Signal, and felt SpectraTM anti-trauma material such as FragliteTM also marketed by Allied Signal.
Applicant has recognized the advantage of using an air gap principle, that is, two 2 5 separate packets of interleaved ballistic material which when placed back to back acts to better defeat a ballistic round than a single packet having the equivalent number of interleaved layers of ballistic material. This air gap principle, it was recognized, would also apply if the packets were placed on either side of a layer of FragliteTM, or SpectraTM felt, the underlying principle being the 2169~15 introduction of a layer of reduced density so as to change the impedance between the ballistic packets. lt was determined that the air gap principle using FragliteTM would both reduce the blunt trauma and defeat a high velocity round such as a Tokarev steeljacketed round, if the front packet of interleaved ballistic material was lelt surl;ciently cohesive to acl as a cohesive l~allistic resislalll unit. Thus, within a stack of thirty plies of SpectrAmidTM material, if the FragliteTM layer was inserted between the fourth and fifth layers up from the bottom (which would correspond to a layer between the fourth and fifth layers from the back i.e. closest to the wearer of the body armour) that high velocity rounds were consistently stopped, and that the mushrooming of the rounds was consistent, as the rounds penetrated into the front ballistic packet (i.e. the packet 0 furthest from the wearer of the body armour, having 26 plies of SpectrAmidTM). Thus, FragliteTM
or SpectraTM felt (hereinafter collectively FragliteTM or anti-trauma felt) was used as an anti-trauma felt rather than as an anti-fragmentary felt. Other layers of reduced density may include the use of a resilient honeycomb material or, for example, a light rubber (or the like) layer.
In testing the soft body armour of the present invention, a ballistic performance indicator known in the industry as "V50" testing was also used as a means of evaluation. VS0 testing is for ballistic performance as opposed to blunt trauma performance. In the past, testing for ballistic performance meant merely a pass/fail indication as to whether a ballistic round was defeated or not by the test specimen. In V50 testing, ballistic rounds having high ballistic 2 o velocities (to ensure complete penetration of the test specimen) are deliberately used first. The ballistic velocity ofthe rounds is then incremented dowllw~ds in increments of 50 or l00 feet per second until a partial penetration of the test specimen is obtained. At that point, the ballistic velocity of the rounds is once again increased in the same increments until complete pcnetratioll is once again obtained. In this manner, the edge of the testing envelope between partial 2 5 penetrations and complete penetrations of the test specimen results in, advantageously after four complete penetrations and four partial penetrations and incrementing therebetween, the V50 average ballistic velocity can then be calculated for the test specimen.
: ~ , - ~ ;. ' 216q415 -V50 testing was successfully completed on a test specimen, as described above and diagramatically illustrated in Figure I (number of layers not accurately depicted), having four layers of SpectrAmidTM in the ballistic material packet closest to the body of the user (the back packet I ), 26 layers of SpectrAmidl M in the packet of ballistic material ~`urthest from the body of the user (the front packet 2), and interleaved in between an anti-trauma layer 3 of three sheets of FragliteTM felt. This configuration had an approximate areal density of 1.81 pounds per square foot. Ballistic rounds 4 according to the Japanese specification were generally defeated in the front packet with no penetrations, and the backface signature did not exceed a 20 mm dent in the calibrated clay bed 5. The energy from ballistic round 4 causing the backface signature 6 in clay 0 bed 5 is shown as lines of radiated energy from round 4.
V50 testing of a similar configuration having one less sheet of SpectrAmidTM (i.e.
5:3:24 SpectrAmidTM (back packet):FragliteTM:SpectrAmidTM (front packet)) was successful so long as test rounds fired at the test specimen were not placed so as to impact strands of aramid Iying on the same axis, i.e., the rounds were scattered about the specimen so that no two rounds impacted the same aramid strands. Even with faulty test procedure where more than one round was allowed to impact the same stands of aramid, V50 testing was almost successfully completed and blunt trauma was only slightly greater than the Japanese specification limit of 20 mm backface signature.
For the soft body armour of the present invention to defeat other threat levels than the threat level corresponding to the Japanese specification, layers of SpectrAmidTM would be added or removed as required from the front packet of ballistic material, i.e. that l-acket havin~
the larger number of layers of ballistic material.
Testing results are incorporated herewith as Tables 1, 2 and 3. V50 testing in Table 1 indicated a V50 average ballistic velocity of 509.5 metres per second. Table 2 was not V50 testing, but merely confirmed that the 4:3:26 configuration of SpectrAmidTM (back .
~ ~ , ', ,. ~' .
packet):FragliteTM:SpectrAmidTM (front packet) would defeat ballistic round velocities of 450 metres per second. Testing in Table 3 was V50 testing and, similar to Table l, conflrmed a V50 average ballistic velocity of SlO metres per second for the 4:3:26 SpectrAmidTM (back packet):FragliteTM:SpeclrAmidTM (front packet) soft body armour.
It was further determined that the areal density in the above SpectrAmidTM/FragliteTM combination was improved over the areal density of a similar configuration in which the three sheets of FragliteTM were replaced with 0.25 inches of anti-trauma foam. The ballistic panel with the anti-trauma foam layer had an areal density of greater than two pounds per square foot. The SpectrAmidTM/FragliteTM combination also exhibited decreased volume and improved flexibility as compared to ballistic panels that presently meet the Japanese specifications.
It is thought by Applicant that because the aramid strands within the SpectrAmidTM
ballistic material have high melting temperatures, that there is a reduction in the loss of performance of the ballistic material for steeljacketed rounds which have higher temperatures as opposed to copperjacketed rounds.
As will be al)pal~ll to those skilled in the art in the light of the foregoing disclosure, many alterations and modifications are possible in the practice of this invention without departing from the spirit or scope thereof. Accordingly, the scope of the invention is to be construed in accordance with the substance defined by the following claims.
Claims (20)
1. Reduced blunt trauma soft body armour comprising a first ballistic material packet overlaid by a second ballistic material packet, means for reduction of blunt trauma interleaved between said first and second ballistic material packets.
2. The reduced blunt trauma soft body armour of claim 1 wherein said means for reduction of blunt trauma comprises air gap means for maintaining an air gap between said first and second ballistic material packets when worn by a user.
3. The reduced blunt trauma soft body armour of claims 1 or 2 wherein said first ballistic material packet is for releasable wearing, by a user, suspended in a position most closely adjacent to said user, said first ballistic material packet comprises at least four closely overlaid sheets of uni-directional aramid fibre ballistic material, wherein said layer of blunt trauma reduction material comprises three closely overlaid sheets of anti-trauma felt, and wherein said second ballistic material packet comprises 26 closely overlaid sheets of uni-directional aramid fibre ballistic material.
4. The reduced blunt trauma soft body armour of claims 1 or 2 wherein said first ballistic material packet is for releasable wearing, by a user, suspended in a position most closely adjacent to said user, said first ballistic material packet comprises at least five closely overlaid sheets of uni-directional aramid fibre ballistic material, wherein said layer of blunt trauma reduction material comprises three closely overlaid sheets of anti-trauma felt, and wherein said second ballistic material packet comprises 24 closely overlaid sheets of uni-directional aramid fibre ballistic material.
5. The reduced blunt trauma soft body armour of claims 1 or 2 wherein said first ballistic material packet, for releasable wearing by a user, most closely adjacent to said user, comprises at least four closely overlaid sheets of uni-directional aramid fibre ballistic material, said layer of blunt trauma reduction material comprises two closely overlaid sheets of anti-trauma felt, and said second ballistic material packet comprises 26 closely overlaid sheets of uni-directional aramid fibre ballistic material.
6. The reduced blunt trauma soft body armour of claims 1 or 2 wherein said first ballistic material packet, for releasable wearing by a user, most closely adjacent to said user, comprises at least five closely overlaid sheets of uni-directional aramid fibre ballistic material, said layer of blunt trauma reduction material comprises two closely overlaid sheets of anti-trauma felt, and said second ballistic material packet comprises 24 closely overlaid sheets of uni-directional aramid fibre ballistic material.
7. The reduced blunt trauma soft body armour of claims 1 or 2 wherein said first ballistic material packet, for releasable wearing by a user, most closely adjacent to said user, comprises at least four closely overlaid sheets of uni-directional aramid fibre ballistic material, said layer of blunt trauma reduction material comprises four closely overlaid sheets of anti-trauma felt, and said second ballistic material packet comprises 26 closely overlaid sheets of uni-directional aramid fibre ballistic material.
8. The reduced blunt trauma soft body armour of claims 1 or 2 wherein said first ballistic material packet, for releasable wearing by a user, most closely adjacent to said user, comprises at least five closely overlaid sheets of uni-directional aramid fibre ballistic material, said layer of blunt trauma reduction material comprises four closely overlaid sheets of anti-trauma felt, and said second ballistic material packet comprises 24 closely overlaid sheets of uni-directional aramid fibre ballistic material.
9. The reduced blunt trauma soft body armour of claims 1-8 wherein said uni-directional aramid fibre ballistic material is SpectrAmidTM, and said anti-trauma felt is FragliteTM.
10. The reduced blunt trauma soft body armour of claims 1-9 wherein said armour has an areal density of less than 2 pounds per square foot.
11. Reduced blunt trauma soft body armour comprising a first ballistic material packet overlaid by a second ballistic material packet, a layer of reduced density material interleaved between said first and second ballistic material packets, wherein said reduced density material has a reduced density as compared to said first and second ballistic material packets.
12. The reduced blunt trauma soft body armour of claim 12 wherein said layer of reduced density material comprises air gap means for resiliently maintaining an air gap between said first and second ballistic material packets when worn by a user.
13. The reduced blunt trauma soft body armour of claims 11 or 12 wherein said first ballistic material packet is for releasable wearing, by a user, suspended in a position most closely adjacent to said user, said first ballistic material packet comprises at least four closely overlaid sheets of uni-directional aramid fibre ballistic material, wherein said layer of reduced density material comprises three closely overlaid sheets of anti-trauma felt, and wherein said second ballistic material packet comprises 26 closely overlaid sheets of uni-directional aramid fibre ballistic material.
14. The reduced blunt trauma soft body armour of claims 11 or 12 wherein said first ballistic material packet is for releasable wearing, by a user, suspended in a position most closely adjacent to said user, said first ballistic material packet comprises at least five closely overlaid sheets of uni-directional aramid fibre ballistic material, wherein said layer of reduced density material comprises three closely overlaid sheets of anti-trauma felt, and wherein said second ballistic material packet comprises 24 closely overlaid sheets of uni-directional aramid fibre ballistic material.
15. The reduced blunt trauma soft body armour of claims 11 or 12 wherein said first ballistic material packet, for releasable wearing by a user, most closely adjacent to said user, comprises at least four closely overlaid sheets of uni-directional aramid fibre ballistic material, said layer of reduced density material comprises two closely overlaid sheets of anti-trauma felt, and said second ballistic material packet comprises 26 closely overlaid sheets of uni-directional aramid fibre ballistic material.
16. The reduced blunt trauma soft body armour of claims 11 or 12 wherein said first ballistic material packet, for releasable wearing by a user, most closely adjacent to said user, comprises at least five closely overlaid sheets of uni-directional aramid fibre ballistic material, said layer of reduced density material comprises two closely overlaid sheets of anti-trauma felt, and said second ballistic material packet comprises 24 closely overlaid sheets of uni-directional aramid fibre ballistic material.
17. The reduced blunt trauma soft body armour of claims 11 or 12 wherein said first ballistic material packet, for releasable wearing by a user, most closely adjacent to said user, comprises at least four closely overlaid sheets of uni-directional aramid fibre ballistic material, said layer of reduced density material comprises four closely overlaid sheets of anti-trauma felt, and said second ballistic material packet comprises 26 closely overlaid sheets of uni-directional aramid fibre ballistic material.
18. The reduced blunt trauma soft body armour of claims 11 or 12 wherein said first ballistic material packet, for releasable wearing by a user, most closely adjacent to said user, comprises at least five closely overlaid sheets of uni-directional aramid fibre ballistic material, said layer of reduced density material comprises four closely overlaid sheets of anti-trauma felt, and said second ballistic material packet comprises 24 closely overlaid sheets of uni-directional aramid fibre ballistic material.
19. The reduced blunt trauma soft body armour of claims 11-18 wherein said uni-directional aramid fibre ballistic material is SpectrAmidTM, and said anti-trauma felt is FragliteTM.
20. The reduced blunt trauma soft body armour of claims 11-19 wherein said armour has an areal density of less than 2 pounds per square foot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2169415 CA2169415A1 (en) | 1996-02-12 | 1996-02-12 | Reduced blunt trauma body armour |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2169415 CA2169415A1 (en) | 1996-02-12 | 1996-02-12 | Reduced blunt trauma body armour |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2169415A1 true CA2169415A1 (en) | 1997-08-13 |
Family
ID=4157563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2169415 Abandoned CA2169415A1 (en) | 1996-02-12 | 1996-02-12 | Reduced blunt trauma body armour |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2169415A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006002977A1 (en) | 2004-07-02 | 2006-01-12 | Dsm Ip Assets B.V. | Flexible ballistic-resistant assembly |
| WO2007066059A1 (en) | 2005-12-07 | 2007-06-14 | Gerald Robert Gilmer Michaluk | Improvements in armour |
| WO2012015680A3 (en) * | 2010-07-28 | 2012-05-10 | Honeywell International Inc. | Ballistic shield composites with enhanced fragment resistance |
-
1996
- 1996-02-12 CA CA 2169415 patent/CA2169415A1/en not_active Abandoned
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006002977A1 (en) | 2004-07-02 | 2006-01-12 | Dsm Ip Assets B.V. | Flexible ballistic-resistant assembly |
| EP2051038A2 (en) | 2004-07-02 | 2009-04-22 | DSMIP Assets B.V. | Flexible ballistic-resistant assembly |
| WO2007066059A1 (en) | 2005-12-07 | 2007-06-14 | Gerald Robert Gilmer Michaluk | Improvements in armour |
| WO2012015680A3 (en) * | 2010-07-28 | 2012-05-10 | Honeywell International Inc. | Ballistic shield composites with enhanced fragment resistance |
| EP2598825A2 (en) * | 2010-07-28 | 2013-06-05 | Honeywell International, Inc. | Ballistic shield composites with enhanced fragment resistance |
| EP2598825A4 (en) * | 2010-07-28 | 2014-08-27 | Honeywell Int Inc | Ballistic shield composites with enhanced fragment resistance |
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