KR20010040511A - Stab and Bullet Protection Material - Google Patents

Abstract

The present invention relates to a lightweight, flexible protective material that is both elastic and meets the PSDB standard for protection against daggers. The protective material of the present invention comprises: a) a metal based structure which can itself have flexible and interlocked rings or a combination of rings and plates, b) a second layer of impact energy absorbing material, Iii) a second layer of material, or a combination thereof, and optionally c) a ballistic pack.

Description

Anti-ballistic and bulletproof material {Stab and Bullet Protection Material}

For example, bulletproof vests made using Kevlar (trademark) para-aramid fibers from DuPont are well known. However, in Europe, where stricter laws apply to the ownership of pistols, daggers are the main weapon and in some countries the most important weapon. In the early 1990s, the first testing standards for body armor were established by national agencies in the United Kingdom, Switzerland and Germany.

According to the United Kingdom Police Scientific Development Branch (PSDBB) standard introduced in 1993, for example, PSBD blades in the energy of 20 to 65 joules fired by an air rifle (90 °). For threats 1 and 5, the blade penetrates up to 5 mm behind the armor when the energy is below 42 joules, and when the energy exceeds 42 joules, the blade penetrates up to (1.2 × energy in Joules -45) mm behind the armor. do.

At area densities suitable for everyday wear, most of the soft and flexible textile systems available today are over 30 joules in German daggers, or PSDB daggers, as described in the German specification (Technische Richtlinie, Schutzwesten, 1994). In many cases, it doesn't stop properly.

To stop this amount of puncture, a hybrid system is commonly used that combines with an endogenous metal or ceramic pack mixed with the fabric backing. A common problem with such hybrid systems is that the pack, which is the front chamber, tends to be huge, heavy and inflexible, especially when small metal or ceramic plates are used.

In order to improve the flexibility of this hybrid system, a chain armor system was used as a vane pack. For example, European Patent Publication No. 0670466 A1 describes a ballistic and antifoam system in which endurance is imparted by incorporating a chain armor system into a polymerizable resin. However, this system does not provide maximum endurance because, as anyone skilled in the chain armor industry recognizes, inhibiting the relative movement of rings in chain armor systems adversely affects its endurance. In addition, the resins used to incorporate chain armor undesirably increase the area density of the overall protective system. Therefore, there is a need for a lightweight flexible protective material that is ballistic and provides protection against daggers at relatively high stab energy levels as specified by UK PSDB and Germany.

〈Invention Summary〉

The present invention relates to a lightweight, flexible material having improved endurance at high stab energy levels of 30 joules or more, wherein the anti-foam material can optionally be combined with a ballistic pack to form an integrated anti-ballistic and ballistic material. The anti-fogging material of the present invention comprises (a) a metal-based structure which may itself have flexible and interlocked rings or a combination of ring and plate, and (b) a second impact energy-absorbing material, anti-fogging material. Layers or combinations thereof. Optionally, the antifoam material includes (c) a ballistic pack.

<Brief Description of Drawings>

1 is a side view from above of a puncture test apparatus used in an example for testing the endurance of a protective material of the present invention.

The present invention relates to anti-foam and ballistic-proof materials.

The present invention relates to a lightweight flexible material having improved endurance at high stab energy levels of 30 joules or more. The antifoam material may optionally be combined with a ballistic pack to form an integrated antifoam and antiballistic material.

The anti-foam material is a metal substrate that can block or stop a flexible, sharp object by itself, two components forming an integrated protective material, and can have interlocked rings or a combination of rings and plates. And a b) impact energy absorbing material, a second layer of antifoam material, or a combination thereof, wherein the impact energy absorbing material is typically located away from the impact surface following component (a), with exceptions Can be. Optionally, the anti-foam material may include (c) a ballistic pack that is a ballistic resistant component to form the anti-foam and bulletproof material. Ballistic packs include multiple layers of woven or nonwoven fabrics based on high strength fibers such as para-aramid, ultra high molecular weight polyethylene, ballistic nylon, and the like. Component (a) is a metal based structure which is flexible in itself and capable of blocking or stopping a sharp object in itself. Typically, such structures include interlocked rings or a combination of rings and plates. This structure may be in the form of steel or titanium based chain armor. Chain armor should be light, flexible and endurable. There is no other requirement for chain armor, but if chain armor is made from metal rings, the diameter of the metal ring is preferably about 1.0 mm to about 20 mm. The diameter of the wire used to make the ring may range from 0.2 to 2.0 mm.

Component (b) can be a layered energy absorbing material, or a second layer of antifoam material, or a combination thereof. The impact energy absorbing material may be a soft material that has dimensional stability and whose thickness rapidly decreases upon energy impact. Preferred materials include woven, knitted, or nonwovens, such as non-woven felt or fabric, such as needles, such as rubber or elastomeric sheets or foams. Combinations of woven and non-woven materials may be used. In addition, a single layer or multiple layers of these materials may be used.

The second layer of anticorrosion material may be a metal based structure such as component (a). If this material is chain armor, there are no special requirements for these layers. If the chain armor is made from a weld hook, the diameter of the weld hook is preferably about 1.0 mm to about 20 mm. The diameter of the wire used to make the ring may be 0.2 to 2.0 mm. Typically, to maintain the overall required weight limit of the protective material of the present invention, the diameter and total area density of the wires used in the second chain armor layer is less than the first chain armor layer.

The second layer of antifoam material may also be a single or multiple layers of flexible impregnated fabric based on high strength fibers such as para-aramid, high strength polyethylene, nylon and the like. This is a preferred embodiment of the second layer of antifoam material. The flexible coated fabric layer includes a plurality of fibers and support materials that can resist penetration, and the fibers are at least partially incorporated into the support material to limit the relative movement of the fibers therein. These flexible impregnated fabrics, when tested at an area density of 9.1 to 9.2 kg / m ² , stopped the Metropolitan triangular knife with 25 Joules of attack energy, which was applied to the NIJ 010103 located on the back of the fabric. It can be further defined as a fabric which infiltrates according to the Plastiline Roma backing material which is conditioned according to 16-20 mm or less. The area density of the fabric forming part of component (b) may vary, but the area density of the inventive room material should be within the overall limits described herein. Examples of such flexible impregnated fabrics include DuPont Kevlar® Comport AS Style 288, a Kevlar woven fabric coated with thermoplastic.

Component (b) may be a combination of one or both of the impact energy absorbing material and the second chamber material. That is, component (b) is a combination of an energy absorbing material and a metal based structure, a combination of an energy absorbing material and a single or multilayer flexible impregnated fabric, or an energy absorbing material, a metal based structure and a single layer or a multilayer. It may be a combination with a flexible impregnated fabric of.

The third component (c) is optional and is a ballistic pack. A "ballistic pack" is defined as an elastic resistant fabric, which is one or more layers of room containing high strength fibers of a network structure. Such fibers may or may not be coated. The fibers in such fabrics are typically of a kind having high tear strength and high scratch resistance. The fibers can be high strength polyethylene fibers, aramid fibers, ballistic nylon, and the like. In a preferred embodiment, the fibers comprise aramid fibers, in particular poly (p-phenyleneterephthalamide) fibers. An example of an aramid fiber that can be used is Kevlar (registered trademark) fiber, available from E.I. DuPont de Nemours and Company. The order in which the components (a) and (b) or (a), (b) and (c) are arranged is not important. In addition, component (b) may be located on both sides of component (a) and component (c) may also be located on both sides of component (a).

The roominous material comprising components (a) and (b) has an area density of 10 kg / m ² or less, preferably 6.5 kg / m ² or less, most preferably 4.6 kg / m ² or less. Antistatic and antiballistic materials comprising components (a), (b) and (c) have an area density of 14 kg / m ² or less, preferably 12 kg / m ² or less, most preferably 10.5 kg / m ² or less to be. This range is desirable to meet the PSDBHG1 / KR42 (Pistol 1 / Single-Resistance-42 Joules) standard.

The present invention has the following features.

(i) The presence of component (b), which is an energy absorbing layer on the back of the chain armor layer, substantially increases the endurance of the anti-foam material. It is well known in the defense industry that the endurance of chain armor systems depends on the energy absorption capacity of the system.

(ii) When the stabbing energy is high, that is, when stabbing energy of at least 35 joules is applied to the anti-fogging material, the second layer of anti-fogging material such as chain armor layer or multi-layer coated kevlar fabric has Prevents the occurrence of "extreme breakage", which is the term used to describe the complete penetration.

(iii) When the coated kevlar fabric is used as a second layer of anti-foam material, since it is itself elastic resistant, the area density of the anti-foam material alone provides adequate protection against bullets. The ballistic pack (c) is not needed or otherwise reduced because a ballistic pack of lower area density is required.

Unless otherwise noted, the stab test in the following examples was performed on the “dropping weight” test apparatus shown in FIG. 1. Such a machine is based on the vertical free fall of the anthographic plate and the dead weight to fix the blade 11. The stab energy is defined as the weight of the projected object (anthrax plate + blade + dead weight) (m) and the height at which the projected object falls (dropping height (12)).

E (Joules) = 9.5 (m / s ² ) × m (kg) × h (m)

The test pack 13 of protective material is mounted horizontally on the plastilin block 14. The type of plastilin was made of Plastilina Roma No. 1, which the drop test according to NIJ 0101.03 adjusted to give a projection of 25 +/- 3 mm. After each drop, the test pack 13 was removed from the plastilin block 14 and the penetration depth of the blade 11 was measured. The length of the blade 11 protruding from the rear surface of the test pack 13 was measured as the penetration depth.

Examples 1-2 and Comparative Examples 3-4

In Examples 1 and 2, a flexible anti-ballistic and bulletproof material was made with a anti-foam pack made of 26 layers of Kevlar Comfort AS Style 288 of (a) chain armor 3.2 kg / m ² , (b) 6.3 kg / m ² . . The unit "kg / m ² " or "g / m ² " means the area density of the material. The total area density of the protective material in Examples 1 and 2 was 9.5 kg / m ² .

Protective materials were formed from Comparative Examples 3 and 4 above (a) and each of 32 layers of uncoated Kevlar HT, 200 g / m ² and a total of 6.4 kg / m ² .

Both materials were tested with PSDB 1 unit of 42 joules and the penetration depth is presented below.

Example Penetration depth (mm) One 0 2 0 C * 3 7 C4 9 * Indicates a comparative example

Examples 5-6 and Comparative Examples 7-8

In Examples 5 and 6, (a) a 2.4 kg / m ² chainmail pack under slight tension in the vertical and horizontal directions, (b) each of the three layers, 185 g / m ² each and a total of 0.555 kg / m ² Kevlar felt perforated with needles, and (c) ballistic packs made of 48 layers of uncoated Kevlar fabric, each 120 g / m ² , designed for NIJ Level IIIA protection, totaling 5.76 kg / m ² . Flexible antifogging and bulletproof materials were made. The total area density of the protective material of this system was 8.715 kg / m ² .

In Comparative Examples 7 and 8, the protective material was produced only by the above (a) and (c).

The depth of penetration is shown below with a drop test of 35 Joules of PSDB single road.

Example number Penetration depth (mm) 5 5 6 0 C7 18 C8 15

Examples 9-13

(a) chain armor of 3.2 kg / m ² , (b) two layers of Kevlar felt and 3.2 kg / m ² armor of 185 g / m ² each and a total of 0.37 kg / m ² , and (c) Kevlar HT Flexible antiballistic and bulletproof materials were made with a ballistic impact pack with fabric style 363 and backing control material and an area density of 5.4 kg / m ² . The total area density of the protective material was 12.2 kg / m ² . The material was tested five times at various energy levels with PSBD 1 unit mounted in an air pistol chamber test apparatus embodied in the PSBD standard. The results are as follows.

Example Sting energy (joule) Penetration depth of dagger (mm) 9 41 0 10 47 0 11 45 5 12 52 0 13 63 9

Examples 14-23

(a) a single layer of 4.0 kg / m ² of armor, (b) three layers of kevlar felt of 185 g / m ² each and a total of 0.56 kg / m ² , and (c) Kevlar HT fabric (Style 363) Flexible anti-ballistic and bulletproof materials were made with an HCI PSDB protective ballistic and impact pack with a back control material comprising 20 layers and 4 layers of laminated Kevlar HT fabric (Style 363) with an area density of 5.9 kg / m ² . The total area density of the protective material was 10.5 kg / m ² . The protective material was tested with PSBD 1 and PSBD 5 as in the examples above. The results are as follows.

Example Dagger Sting energy (joule) Penetration depth of dagger (mm) 14 One 44 0 15 One 42 0 16 One 46 0 17 One 52 0 18 One 66 13 19 5 44 0 20 5 41 0 21 5 45 0 22 5 53 0 23 5 64 0

The above examples show that the protective material of the present invention exhibits an unexpected improvement in the penetration of the dagger as compared to conventional protective materials.

Examples 24-35

The protective materials of Examples 14-23 were tested for one level of PSDB pistol using 9 mm and 0.375 ammunition.

Example Ammunition category Speed (m / s ^-1 ) Not penetrated / infiltrated Impact mm 24 9 mm 370 Not penetrated 23 25 9 mm 363 Not penetrated 16 26 9 mm 370 Not penetrated 17 27 9 mm 354 Not penetrated 12 28 9 mm 356 Not penetrated 14 29 9 mm 356 Not penetrated 13 30 0.357 392 Not penetrated 19 31 0.357 395 Not penetrated 12 32 0.357 390 Not penetrated 15 33 0.357 387 Not penetrated 16 34 0.357 393 Not penetrated 11 35 0.357 392 Not penetrated 15

These results indicate that the protective material invented with the present invention, including the ballistic pack, stopped bullets from the PDSB pistol 1 level.

Claims (8)

a) a flexible metal structure of interlocked metal rings or combinations of metal rings and plates, and b) a plurality of fibers and support materials capable of resisting penetration by impact energy absorbing materials, bullets or daggers A second layer of antifoam material, or a combination thereof, wherein at least a portion of the antifoam material is incorporated into the support material and includes one or more flexible layers to limit the relative movement of the fibers Flexible protective material comprising a. The protective material of claim 1 further comprising: c) a ballistic pack having at least one layer of anti-foam and high-strength fabric comprising high strength fibers. The flexible protective material of claim 1, wherein the anticorrosion material comprises a flexible metal structure having interlocked metal rings or a combination of metal rings and plates. The material of claim 1, wherein the anticorrosion material comprises a flexible metal structure having interlocked metal rings or a combination of metal rings and plates, and a plurality of fibers and support materials capable of resisting penetration by bullets or daggers. And at least a portion of the fibers incorporated in the support material to include a combination of one or more flexible layers to limit the relative movement of the fibers. The protective material according to claim 2 or 4, wherein the fibers comprise high strength polyethylene fibers, glass fibers, carbon fibers or aramid fibers. The protective material according to claim 2 or 4, wherein the fibers comprise fibers of poly (p-phenylene terephthalamide). A protective material according to claim 1, wherein the area density is 10 kg / m ² or less. A garment made at least in part from the protective material of claim 1.