Bulletproof protective material

Abstract

To provide a ballistic protective component that offers excellent wearability and impact resistance while keeping mass down. [Solution] A ballistic protective member comprising a laminate containing a ballistic material and a cushioning material, wherein the cushioning material meets the following requirements (a) to (c): (a) It is a double raschel knit fabric, and (b) Its thickness is 9 mm or more and 35 mm or less, and its weight is 500 g / m 2 More than 2000g / m 2 The following applies: (c) The connecting yarn of the double raschel knit fabric is a monofilament with a thickness of 500 dTex or more and less than 2000 dTex.

Description

[Technical Field]

[0001] This invention relates to a bulletproof protective member. [Background technology]

[0002] Police officers, security guards, soldiers, and others will wear ballistic protective gear as needed to protect themselves from attacks with firearms from criminals, terrorists, enemy soldiers, or suspicious individuals, as well as from flying debris from explosives, while performing their duties.

[0003] Conventionally, materials with ballistic protection properties have included woven fabrics made from high-strength fibers, such as para-aramid fibers, polyethylene fibers, and poly(p-phenylenebenzobisoxazole) fibers, as well as woven fabrics coated with or impregnated with resin, and shielding materials made using these fibers. The term "shielding material" here refers to a ballistic protection material formed by laminating a laminate of sheets in which high-strength fibers are arranged orthogonally at 0 and 90 degrees and impregnated with resin, and then laminating and molding this laminate with a synthetic resin film.

[0004] While these materials offer ballistic protection, they offer little reduction in impact to the human body and are generally used in combination with impact-resistant materials. In recent years, there has been a growing demand for protective equipment that possesses both ballistic and high impact resistance.

[0005] To address these challenges, for example, Patent Document 1 proposes a bulletproof material in which a metal plate and a resin foam sheet are arranged in that order. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2007-57133 [Overview of the project] [Problems that the invention aims to solve]

[0007] However, the protective article described in Patent Document 1 had poor conformability to the body, was heavy, and difficult to move. Furthermore, there was a concern that impact resistance would deteriorate if only bulletproof material with metal plates removed and resin foam sheets were used.

[0008] This invention has been made in view of the above problems, and aims to provide a ballistic protective member that is lightweight, highly wearable, and impact resistant. [Means for solving the problem]

[0009] The present invention, which solves the aforementioned problems, is characterized by the following (1) to (4). (1) A ballistic protective member comprising a laminate containing a ballistic material and a cushioning material, wherein the cushioning material satisfies the following requirements (a) to (c). (a) Double raschel knit fabric, (b) Thickness of 8 mm or more and 35 mm or less, and basis weight of 500 g / m 2 More than 2000g / m 2 The following: (c) The connecting yarn of the double raschel knit fabric is a monofilament with a thickness of 500 dTex or more and less than 2000 dTex. (2) The ballistic protection member according to (1), wherein the density of the base material constituting the surface and back surface of the double raschel knit fabric is 1 strand / 25.4 mm or more and 25 strands / 25.4 mm or less for both the wale and the course. (3) The laminate containing the ballistic material has an area density of 6.0 kg / m². 2 The following: A ballistic protection component as described in (1) or (2) that meets the standard velocity in the NIJ0101.07HG2 class ballistic limit test. (4) Total area density is 7.0 kg / m² 2 A ballistic protection material as described in any of the following (1) to (3). [Effects of the Invention]

[0010] According to the present invention, it is possible to obtain a bulletproof protective member that is easy to move during wearing and has excellent impact resistance while suppressing the mass.

Mode for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present invention will be described in detail.

[0012] The bulletproof protective member of the present invention has a laminate including a bulletproof material and a buffer material laminated in this order. When the bulletproof protective member of the present invention is hit by a bullet and the laminate including the bulletproof material is placed on the landing side and the buffer material is placed on the side of the protected object, the laminate including the bulletproof material can absorb the energy of the bullet first when hit. When the buffer material is likely to be broken during impact, a second bulletproof material may be arranged inside (on the side of the protected object) the buffer material.

[0013] (Laminate including bulletproof material) The bulletproof protective member of the present invention has a laminate including a bulletproof material. By being a laminate, when bent, stress concentration at a single point is suppressed, making it easier to bend and improving wearability. The material used for the bulletproof material is not limited, and examples include woven fabrics made of high-strength fibers, shield materials, high-strength fiber woven fabrics impregnated with resin, and high-strength fiber woven fabrics coated with resin. Examples of high-strength fibers include para-aramid fibers, polyethylene fibers, polyphenylene benzobisoxazole fibers, and the like. Here, the laminate refers to a laminate in which two or more layers of bulletproof materials are laminated.

[0014] The areal density of the laminate including the bulletproof material is preferably 6.0 kg / m 2 It is desirable to have the following configuration. When the areal density is 6.0 kg / m 2 or less, even if a buffer material or other members are added, it is easy to design so that the wearer hardly feels the weight and can move easily. The areal density is more preferably 5.3 kg / m 2 or less. On the other hand, in order to satisfy the bulletproof performance, the areal density is preferably 3.0 kg / m 2 or more.

[0015] The laminate containing the bulletproof material preferably further satisfies the reference velocity in the ballistic limit test of NIJ0101.07HG2 class. The HG2 class is the most stringent test condition among soft armors, and it can be seen that by satisfying this, it has sufficient bulletproof performance as a soft armor. Also, by satisfying this reference velocity, it becomes difficult for bullets to penetrate the laminate containing the bulletproof material, and the impact resistance of the bulletproof protection member is further improved.

[0016] while the areal density of the laminate containing the bulletproof material is 6.0 kg / m 2 As a method of satisfying the ballistic limit test of HG2 class while being the following, for example, a method of laminating 8 to 12 sheets of "Kevlar" (registered trademark) XP series manufactured by Dupont, a method of laminating 20 to 28 sheets of "GoldFlex" (registered trademark) manufactured by Honeywell, etc. can be mentioned.

[0017] (Buffer material) The bulletproof protection member of the present invention is formed by laminating a buffer material on the laminate.

[0018] The buffer material has a double raschel fabric. Here, the double raschel fabric is an abbreviation of a double needle bar raschel machine, and refers to a fabric characterized by a three-layer structure of the front surface, the back surface, and the connecting part between the front and the back. The double raschel fabric can create a gap between the bulletproof material and the body without increasing the mass too much, and can control the degree of energy dispersion and strength at the time of impact with a single sheet, so the cost can be suppressed compared to stacking multiple buffer materials.

[0019] The buffer material has a thickness of 8 mm or more and 35 mm or less, and a basis weight of 500 g / m 2 or more and 2000 g / m 2 or less.

[0020] If the thickness is less than 8mm, it is difficult to obtain sufficient strength, and the energy is transmitted locally upon impact, making it difficult to distribute the energy over a wide area to enhance impact resistance. On the other hand, if the thickness exceeds 35mm, it becomes bulky and the waist becomes too wide, making it difficult to move, and the bending stress tends to concentrate at one point when the cushioning material is thick, making it difficult to bend and not suitable for wearing. A thickness of 25mm or less is preferable.

[0021] Weight: 500g / m 2 If the weight is less than 2000g / m², it is not practical to ensure sufficient impact resistance and thickness. On the other hand, if the weight is 2000g / m², 2 Beyond this point, it becomes heavy, and when combined with laminates containing ballistic materials, the mass of the ballistic protective component increases. The base weight is 1400g / m². 2 The following are preferable.

[0022] While there are no particular limitations on the fibers of the base material that constitute the surface and back surface, synthetic fibers such as polyester fibers, polyethylene fibers, polyamide fibers, polypropylene fibers, polyacrylonitrile fibers, polyphenylphenylene fibers, polyimide fibers, polyvinyl chloride fibers, polyvinylidene chloride fibers, polyfluorovinylidene fibers, polytetrafluoroethylene fibers, polycarbonate fibers, polyvinyl alcohol fibers, poly(p-phenylene terephthalate) fibers, and regenerated cellulose fibers can be used. Natural fibers such as wool, cotton, hemp, and silk can be used. Inorganic fibers such as glass fibers, various ceramic fibers, and carbon fibers can be used.

[0023] The fabric structure that makes up the surface and back surface is not particularly limited, but examples include double chain knit, Atlas knit, Denby knit, and tricot. Furthermore, by moving the reed from side to side for each course, it is possible to knit in a rhombic or honeycomb structure, or a mesh-like structure that combines rhombic and honeycomb shapes. Doing so increases the voids, making the fabric lighter and lighter, while also maintaining strength against bending moments.

[0024] The density of the base material constituting the surface and back of the double raschel knit fabric is preferably 1 thread / 25.4 mm or more and 25 threads / 25.4 mm or less for both the wale and coarse weave. A density of 1 thread / 25.4 mm or more reduces the risk of the bullet passing through the knit fabric along with the impacted ballistic material. A density of 2 threads / 25.4 mm or more is more preferable. On the other hand, a density of 25 threads / 25.4 mm or less reduces the distance between the knots that act as fulcrums supporting the impact during bullet absorbing, thus preventing the impacted area from tearing easily. A density of 15 threads / 25.4 mm or less is more preferable.

[0025] The fibers constituting the connecting yarn of the double raschel knit fabric are preferably synthetic or inorganic fibers that can be manufactured as monofilaments, and examples include polyester fibers, polyethylene fibers, polyamide fibers, polypropylene fibers, polyacrylonitrile fibers, polyphenylphenylene fibers, polyimide fibers, polyvinyl chloride fibers, polyvinylidene chloride fibers, polyfluorovinylidene fibers, polytetrafluoroethylene fibers, polycarbonate fibers, polyvinyl alcohol fibers, poly(p-phenylene) terephthalate fibers, regenerated cellulose fibers, various ceramic fibers, carbon fibers, and the like.

[0026] The connecting yarn for the double raschel knit fabric is a monofilament with a density of 500 dTex or more and less than 2000 dTex. In the case of multifilament yarn, it would be too flexible and lack sufficient rigidity to absorb impact. As a result, impact resistance would decrease. Using monofilament connecting yarn provides sufficient impact resistance.

[0027] The connecting thread has a fineness of 500 dTex or more and less than 2000 dTex. This increases the compressive strength in the thickness direction while maintaining lightness, and improves impact resistance by dispersing the energy upon impact over a wide area. If the fineness of the connecting thread is less than 500 dTex, the strength in the thickness direction decreases, and the energy is transmitted locally upon impact, so the impact upon impact cannot be sufficiently dispersed, and impact resistance decreases. A fineness of 520 dTex or more is preferable for the connecting thread. On the other hand, if the fineness of the connecting thread is 2000 dTex or more, the rigidity becomes too high and wearability deteriorates. A fineness of 1800 dTex or less is preferable for the connecting thread.

[0028] The connecting threads can transition left and right between the front and back fabrics, creating diagonal sections. This allows the vertical force to be released laterally when pressure is applied perpendicular to the front and back surfaces. Furthermore, the elasticity of the fabric itself provides a cushioning effect, increasing pressure resistance and durability, while also preventing buckling of the connecting thread sections themselves. The method of diagonal crossing is not particularly limited, but it allows for shifting the positions of the openings in the opposing front and back fabrics left and right, or using different fabric textures for the front and back surfaces.

[0029] (Bulletproof protective material) The ballistic protection member of the present invention has a total area density of 7.0 kg / m². 2 Preferably, the total area density is 7.0 kg / m². 2 The following conditions allow the wearer to move easily without feeling the weight: The total area density is 6.5 kg / m². 2 The following is more preferable. On the other hand, from the viewpoint of further improving impact resistance, the area density is 3.5 kg / m². 2 The above is preferable.

[0030] (Manufacturing method for ballistic protection materials) The ballistic protection member of the present invention can be manufactured by sequentially laminating a laminate containing a ballistic material and a cushioning material cut to any size. The laminated material can be further reinforced by layering a sheet containing high-strength fibers to prevent scattering of cushioning material fragments, or by securing the edges with tape, sewing, or placing it in a bag, but the method is not limited. [Examples]

[0031] The present invention will be specifically described below with reference to examples, but is not limited to these examples.

[0032] (area density) The area density of the laminates containing ballistic materials and ballistic protective components, i.e., the mass per unit area, was measured using an electronic balance (EK-610i, manufactured by A&D Co., Ltd.). Specifically, the mass of each component, cut into 40cm x 40cm pieces, was measured N3 times, and the mass was divided by the area to obtain the area density for each component.

[0033] (thickness) The thickness was measured using a digital caliper (Shinwa Co., Ltd., model number 19975). Specifically, each component was measured N5 times, and the average value was taken as the thickness of each component.

[0034] (Ballistic limits test) Ballistic limit tests of laminates containing ballistic material were conducted in accordance with NIJ0101.07 (October 2023 edition). Specifically, ballistic material was cut into 40cm squares, the required number of pieces were laminated, and at each of the four corners, 5cm lengths of polyester thread (Oonuki Textile Co., Ltd.'s "Ace Crown" (registered trademark) #20, 233dTex) were sewn together 1cm inside two sides to form a laminate containing ballistic material. Subsequently, ballistic limit tests were conducted with 9mm Luger FMJ RN 124 grains and .44 MAG JHP 240 grains in accordance with HG2 class regulations. The reference velocities for the minimum penetration velocity (LC) of each are 457.1 m / s for 9mm Luger and 445.1 m / s for .44 MAG. Results greater than these values ​​indicate that the ballistic limit test meets the reference velocity in the NIJ0101.07 HG2 class ballistic limit test.

[0035] (wearability) Wearability was evaluated using a three-point bending test fixture as described in JIS K7171. The test specimen consisted of a 25cm x 25cm piece of ballistic protective material, secured on all four sides with cloth tape (ASKUL's "Genba no Chikara", 0.2mm thick, 50mm wide). The distance between the support points was 66mm, and the center of the test specimen was positioned in the middle of this distance. The maximum load was measured when the specimen was pressed 20mm from the surface at a speed of 100mm / min. The test was performed on both the firing side and the opposite side, in both the longitudinal and transverse directions. Of the values ​​obtained for the longitudinal and transverse directions on both the firing side and the opposite side, those with a maximum load of less than 150N were marked with ◎, those between 150N and 170N were marked with ○, and those exceeding 170N were marked with ×. A smaller value indicates that the material bends more easily with a lower load and follows body movements more readily, thus indicating superior wearability.

[0036] (Impact resistance) The samples used were made by cutting ballistic protection material into 40cm squares and securing all four sides with cloth tape. Shooting tests were conducted according to MIL-STD-662F. The samples were fixed onto modeling clay (Roma Plastilina #1) adjusted to an internal temperature of 40±2℃, with the laminated side containing the ballistic material facing the firing surface. The sights were aimed 7cm from two adjacent sides of the sample. The muzzle was positioned 2.5m from the sample, and a 7.62mm diameter, 2.84g dummy fragmentation projectile (NATO STANDARD STANAG 2920-V2, manufactured by Asahi Seiki Kogyo Co., Ltd. in 2003) was fired at 390±20m / s. The velocity was measured 0.5m in front of the sample. Each test was performed three times. After shooting, the samples were removed, and the depth of the indentation in the modeling clay was measured using calipers. Samples with a maximum indentation of less than 17.0 mm were marked with ◎, and those with an indentation of 17.0 mm or more were marked with ×.

[0037] <Example 1> Kevlar® K520 (manufactured by Dupont, mass per unit area 520 g / m²) is a biaxial para-aramid ballistic material. 2Ten sheets of a 0.52mm thick material were cut into 40cm squares and stacked. At each of the four corners, 1cm from the inside of two sides, a 5cm length was sewn using polyester thread (Oonuki Textile Co., Ltd.'s "Ace Crown" (registered trademark) #20, 233dTex). This resulted in a laminate containing ballistic material. The mass per unit area of ​​this laminate containing ballistic material is 5.2kg / m². 2 The LC (Low Curve) was 501.0 m / s with a 9mm Luger and 495.0 m / s with a .44 MAG.

[0038] The cushioning material was knitted on a double raschel machine under the following conditions: The front and back base fabrics were made using 445dTex / 1f polyester yarn (Uniplus 440T-PC20-SN) and knitted in Atlas stitch at 4.5G. The connecting yarn was made using 1110dTex / 1f polyester yarn (Uniplus 1100T-PL41-Natural), with a bobbin spacing of 13mm, and the yarn was stretched diagonally so that the openings between the front and back base fabrics were offset by half a stitch. This knitted fabric was set up using dry heat at 180°C for 30 seconds, resulting in a thickness of 9mm and a weight of 507g / m². 2 A double raschel knit fabric with a mesh-like structure containing voids was obtained, with a wale density of 5 threads / 25.4 mm and a coarse density of 9 threads / 25.4 mm.

[0039] A ballistic protective component was constructed by laminating a ballistic material-containing laminate followed by a double-raschel knit fabric, and securing all four sides with cloth tape. The total mass per unit area of ​​this ballistic protective component was 5.7 kg / m². 2 The wearability of this ballistic protection material was excellent at 145N, and its impact resistance was excellent at a dent depth of 14.0mm.

[0040] <Example 2> The laminate containing the ballistic material of Example 1 is made of “Kevlar” (registered trademark) S103 (manufactured by Dupont, mass per unit area 510 g / m²). 2 It consisted of 10 layers of material (0.49 mm thick). The cushioning material uses 170dTex / 1f (Toray Monofilament Co., Ltd. 570H-125W-143-TNFZ) for the front and back base threads, and 1330dTex / 1f polyester thread (Uniplus Co., Ltd. 0.35mm-PX10-SN) for the connecting threads. The knitting and setting process was the same as in the example, except for a 4.5G gauge and a bobbin spacing of 35mm, resulting in a thickness of 30mm and a basis weight of 1222g / m². 2 A double raschel knit fabric with a mesh-like structure containing voids was obtained, with a wale density of 6 threads / 25.4 mm and a coarse density of 10 threads / 25.4 mm. A ballistic protective member was fabricated by laminating a ballistic material-containing laminate and a cushioning material in the same manner as in Example 1. The results are shown in Table 1.

[0041] <Example 3> The laminate containing the ballistic material is made of para-aramid shielding material "GoldFlex" (registered trademark) (manufactured by Honeywell, with a mass of 232 g / m² per unit area). 2 It consisted of 24 layers of material (0.23 mm thick). The cushioning material was constructed using polyester yarn 433dTex / 1f (Toray Monofilament Co., Ltd. 530R-200W-26-X3BZ) for the front and back base threads, and polyester yarn 1822dTex / 1f (Toray Monofilament Co., Ltd. 570H-410W-133-TMBZ) for the connecting threads. The knitting and setting process was carried out in the same manner as in the example, except that the yarn gauge was 9G and the gap between the bobbins was 14mm. The thickness is 9mm and the weight is 1372g / m². 2 A double raschel knit fabric with a mesh-like structure containing voids was obtained, with a wale density of 10 threads / 25.4 mm and a coarse density of 10 threads / 25.4 mm. A ballistic protective member was fabricated by laminating a ballistic material-containing laminate and a cushioning material in the same manner as in Example 1. The results are shown in Table 1.

[0042] <Example 4> The laminate containing the ballistic material was the one used in Example 1. For the cushioning material, the yarns for the front and back knitted fabrics were 310dTex / 1f polyester yarn (Uniplus 310T-PC20-SN), and the connecting yarns were 525dTex / 1f polyester yarn (Uniplus 0.23mm 5F-QB21-Natural). The knitting and setting process was the same as in the example, except that the yarn gauge was 7G and the gap between bobbins was 25mm. The thickness is 22mm and the weight is 922g / m². 2 A double raschel knit fabric with a mesh-like structure containing voids was obtained, with a wale density of 10 threads / 25.4 mm and a coarse density of 21 threads / 25.4 mm. A ballistic protective member was fabricated by laminating a ballistic material-containing laminate and a cushioning material in the same manner as in Example 1. The results are shown in Table 1.

[0043] <Comparative Example 1> The laminate containing the ballistic material was the one used in Example 1. The cushioning material was knitted and set in the same manner as in Example 1, except that the base yarns on the front and back were made of polyester yarn 145dTex / 1f (Uniplus 150T-PC20-SN), and the connecting yarns were made of polyester yarn 445dTex / 1f (Uniplus 440TPC20-SN), with a yarn gauge of 20G and a bobbin spacing of 11mm, resulting in a thickness of 11mm and a weight of 357g / m². 2 A double raschel knit fabric with a mesh-like structure containing voids was obtained, with a wale density of 25 threads / 25.4 mm and a coarse density of 24 threads / 25.4 mm. A ballistic protective member was fabricated by laminating a ballistic material-containing laminate and a cushioning material in the same manner as in Example 1. The results are shown in Table 1.

[0044] <Comparative Example 2> The laminate containing the ballistic material was the one used in Example 1. For the cushioning material, polyester yarn 433dTex / 1f (Toray Monofilament Co., Ltd. 530R-200W-26-X3BZ) was used for the front and back base threads, and polyester yarn 2770dTex / 1f (Uniplus Co., Ltd. 0.51mm-PX10-SN) was used for the connecting threads. The knitting and setting process was carried out in the same manner as in Example 1, except that the yarn gauge was 4.5G and the gap between bobbins was 28mm. The result is a thickness of 25mm and a weight of 1600g / m². 2A double raschel knit fabric with a mesh-like structure containing voids was obtained, with a wale density of 6 threads / 25.4 mm and a coarse density of 15 threads / 25.4 mm. A ballistic protective member was fabricated by laminating a ballistic material-containing laminate and a cushioning material in the same manner as in Example 1. The results are shown in Table 1.

[0045] <Comparative Example 3> The laminate containing the ballistic material was the one used in Example 1. For the cushioning material, polyester yarn 445dTex / 1f (Uniplus 440T-PC20-SN) was used for the front and back base threads, and polyester yarn 1110dTex / 1f (Toray Monofilament 570H-420WLS-133-TMBZ) was used for the connecting threads. The knitting and setting process was carried out in the same manner as in Example 1, except that the yarn gauge was 7G and the gap between the bobbins was 8mm. The thickness is 7mm and the weight is 525g / m². 2 A double raschel knit fabric with a mesh-like structure containing voids was obtained, with a wale density of 8 threads / 25.4 mm and a coarse density of 11 threads / 25.4 mm. A ballistic protective member was fabricated by laminating a ballistic material-containing laminate and a cushioning material in the same manner as in Example 1. The results are shown in Table 1.

[0046] <Comparative Example 4> The laminate containing the ballistic material was the one used in Example 1. For the cushioning material, polyester yarn 445dTex / 1f (Uniplus 440T-PC20-SN) was used for the front and back base threads, and polyester yarn 525dTex / 1f (Uniplus 0.23mm 5F-QB21-Natural) was used for the connecting threads. The knitting and setting process was carried out in the same manner as in Example 1, except that the yarn gauge was 4.5G and the spacing between bobbins was 45mm. The result is a thickness of 42mm and a weight of 1050g / m². 2 A double raschel knit fabric with a mesh-like structure containing voids was obtained, with a wale density of 12 threads / 25.4 mm and a coarse density of 9 threads / 25.4 mm. A ballistic protective member was fabricated by laminating a ballistic material-containing laminate and a cushioning material in the same manner as in Example 1. The results are shown in Table 1.

[0047] [Table 1] [Industrial applicability]

[0048] The ballistic protection material according to the present invention is not limited to ballistic protection clothing worn by police officers, security guards, etc., as described above, but can also be used for armor applications on vehicles, ships, etc. Because the armor is less likely to deform upon impact, power equipment, communication equipment, etc. can be protected from damage.

Claims

1. A ballistic protective member comprising a laminate containing a ballistic material and a buffer material, wherein the buffer material meets the following requirements (a) to (c). (a) Double raschel knit fabric, (b) Thickness of 8 mm or more and 35 mm or less, and basis weight of 500 g / m ２ More than 2000g / m ２ The following: (c) The connecting yarn of the double raschel knit fabric is a monofilament with a density of 500 dTex or more and less than 2000 dTex.

2. The bulletproof protective member according to claim 1, wherein the density of the base material constituting the surface and back surface of the double raschel knit fabric is 1 strand / 25.4 mm or more and 25 strands / 25.4 mm or less for both the wale and the course.

3. The laminate containing the aforementioned ballistic material has an area density of 6.0 kg / m². ２ The following: The ballistic protection member according to claim 1 or 2, which also satisfies the reference velocity in a ballistic limit test of the NIJ0101.07HG2 class.

4. The total area density is 7.0 kg / m². ２ The ballistic protective member according to claim 1 or 2, wherein the following applies:

Images