Edgeproof material

Abstract

To provide a protective article which is easy to produce, has excellent blade-proof performance, has few gaps and easily follows the body.SOLUTION: An edgeproof material made by connecting a series of metal pieces with tape-like fabric sandwiched therebetween on both sides. The size of the metal pieces is 0.25 cm2 or more and less than 4 cm2, with all sides being 2 cm or less. The gap between adjacent metal pieces is 0.1 mm or more and less than 1 mm, and the thickness of the metal pieces is 2 mm or more and less than 4 mm.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a blade-resistant material used to protect the body from bladed tools such as ice picks and butterfly knives. [Background technology]

[0002] Police officers, security guards, soldiers, and others go about their duties wearing protective gear with blade-resistant properties as necessary to protect themselves from attacks with blades by criminals, terrorists, enemy soldiers, suspicious persons, and the like.

[0003] An example of a component with blade-resistant properties is a square plate of high-hardness metal such as a titanium alloy that is connected by inserting a joint part, as described in Patent Document 1. However, because this type of structure is complex, the metal plate units cannot be made very fine, and there is a limit to how well it can conform to the body. In addition, because the process is complicated, production takes time and the cost tends to be high.

[0004] In addition, a type of chain mail using rings and chains has been devised, as in Patent Document 2, but it has many gaps and allows bladed items such as butterfly knives and ice picks, which the police require to provide protective performance, to slip through.

[0005] In addition, as in Patent Document 3, there is a method of improving tracking ability and gaps by weaving thin metal fibers like wire into a mesh, but the wire can be easily cut with scissors, and if cut, there is a risk that the tip may pierce the body. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 5664851 [Patent Document 2] JP 2004-347294 A [Patent Document 3] Japanese Patent Application Publication No. 1-244299 Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present invention is to provide a blade-resistant material which is easy to produce, has excellent blade-resistant performance, has few gaps, and easily conforms to the body. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention has the following configuration. (1) A cut-resistant material made by connecting two pieces of metal arranged in a row with tape-like fabric sandwiched between them on both sides. The size of the metal piece is 0.25 cm 2 More than 4cm 2 and all sides are 2cm or less, The gap between adjacent metal pieces is 0.1 mm or more and less than 1 mm, A blade-resistant material, characterized in that the thickness of the metal piece is 2 mm or more and less than 4 mm. (2) The blade-resistant material described in (1), characterized in that the metal piece has a Mohs hardness of 2 or more and 5 or less. (3) The blade-resistant material according to (1) or (2), characterized in that the tape-shaped fabric is made of high-strength fibers having a strength of 17 cN / dTex or more. (4) The blade-proof material according to any one of (1) to (3), characterized in that the end portion of the tape-like fabric is 0.1 mm to 3.0 mm thicker than the center portion. Effect of the Invention

[0009] The present invention makes it possible to obtain a blade-resistant material that is easy to produce, conforms to the body, and has excellent blade-resistant performance. [Brief description of the drawings]

[0010] [Figure 1] 1 is a schematic top view of a blade-resistant material according to one embodiment of the present invention. FIG. [Diagram 2] 1 is a schematic cross-sectional view of a blade-resistant material according to one embodiment of the present invention. [Diagram 3] FIG. 2 is a schematic cross-sectional view of a metal piece used in the knife-proof material. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The present invention will be described in detail below with reference to the embodiments.

[0012] <Blade-resistant material> The knife-cutting-proof material of the present invention is composed of metal pieces arranged in succession with tape-like fabric sandwiched between both sides, as shown in Fig. 1. That is, metal pieces 1 are sandwiched between both sides of each of a plurality of tape-like fabrics 2 in the width direction (horizontal direction in Fig. 1), and the metal pieces 1 are arranged in succession in the vertical direction in Fig. 1.

[0013] <Metal piece> The size of the metal piece is 0.25 cm 2 More than 4cm 2 The size of the metal piece is less than 0.25 cm and all sides are 2 cm or less. 2 If the size of the metal piece is less than 4cm, it will be difficult to insert it into the tape-like fabric. 2 If it is more than this size, or if one side exceeds 2 cm, it will be difficult for it to conform to the body. Here, the "size of the metal piece" refers to the product of the horizontal length of the metal piece multiplied by the vertical length in the schematic top view of the cut-resistant material as shown in Figure 1.

[0014] The thickness of the metal piece is between 2mm and 4mm. By making the thickness 2mm or more, the possibility of a blade penetrating with 25J of energy is reduced. On the other hand, if the thickness is 4mm or more, the weight increases and the comfort of wearing it becomes worse, so it is preferable that it is less than 4mm.

[0015] Materials used for the metal pieces include aluminum, brass, copper, stainless steel, etc. Among stainless steels, SUS304, which is particularly soft, can be mentioned.

[0016] The method for sandwiching the metal pieces is not particularly limited, but for example, a method can be used in which a metal piece having a cross-sectional shape as shown in Fig. 3 is made using a mold, the tape-shaped fabric is sandwiched between the pieces, and then pressure is applied to close them. When a knife-resistant material as shown in Fig. 1 is obtained in this way, the metal piece is deformed, so that the length of one piece in the horizontal direction of the metal piece is the sum of a and b in Fig. 3. The thickness of the metal piece is d in Fig. 3.

[0017] The gap between adjacent metal pieces is 0.1 mm or more and less than 1 mm. Generally, the standard for cut-resistant materials requires a penetration length of 10 to 5 mm or less, but the tip of a butterfly knife or ice pick has a thickness of about 1.5 mm to 2.0 mm at the tip, so if the gap is less than 1 mm, the blade will not easily penetrate.

[0018] It is desirable for the metal piece to have a Mohs hardness of between 2 and 5. If the Mohs hardness is 2 or higher, it is unlikely that a blade will be able to penetrate it with an energy of 25 J, and if the Mohs hardness is less than 2, there is a risk that a blade will penetrate it. If the Mohs hardness exceeds 5, it will be difficult to bend, which will decrease productivity, and depending on the item, it may even break while being bent, so a Mohs hardness of 5 or less is desirable.

[0019] <Tape-like fabric> By using tape-like fabric, metal pieces can be attached continuously while it is being fed out by roll-to-roll, improving productivity and improving product followability. In addition, the tape-like fabric can be expanded to any size in both the vertical and horizontal directions, making it easy to develop cut-proof materials of various sizes. In this specification, "tape-like fabric" is defined as a fabric whose length is greater than its width and thickness, and whose width is greater than its thickness.

[0020] The ratio between length and width (length / width) is at least 2, and depending on the width of the tape-like fabric, this ratio may be greater, for example at least 4 or at least 6. As a maximum value for length / width, 200,000 may be mentioned.

[0021] The ratio between width and thickness (width / thickness) is greater than 10, preferably greater than 50, and more preferably greater than 100. Width / thickness is at most 2000.

[0022] The high-strength fibers used in the tape-shaped fabric preferably have a tensile strength of 17 cN / dtex or more, more preferably 19 to 40 cN / dtex.Specific examples of such fibers include aromatic polyamide, aromatic polyetheramide, wholly aromatic polyester, ultra-high molecular weight polyethylene, polyvinyl alcohol, polyparaphenylene benzobisoxazole, polybenzimidazole, polyimide, polyetheretherketone, polyetherimide, polyphenylene sulfide, novoloid, polypyridobisimidazole, polyarylate, polyketone, polytetrafluoroethylene, polyoxymethylene, polyacrylonitrile, polyamideimide, and polyetherketone.In terms of impact resistance, productivity, and cost, para-aramid fibers and ultra-high molecular weight polyethylene long fibers are particularly preferred.

[0023] The tape-like fabric is preferably a woven fabric, knitted fabric, or uniaxial or multiaxial structure, which is not particularly limited, but is unlikely to stretch. The uniaxial structure refers to a fiber structure in which fibers are aligned in one axial direction, and the multiaxial structure refers to a fiber structure in which aligned fibers are layered at multiple angles.

[0024] The tape-like fabric of the present invention is preferably thicker at the end than at the center by 0.1 mm to 3.0 mm, preferably 0.5 mm to 2.5 mm. Generally, when attaching a metal piece to a fabric, there is a method of attaching it using an adhesive or the like, but the weight of the adhesive increases and it takes time to harden. However, as shown in Figure 2, if the end of the tape-like fabric 2 is thickened, the metal piece 1 can be attached simply by pressing it, and it is difficult to come off. If the end thickness is 0.1 mm or more thicker than the center, the metal piece is less likely to come off even if the fabric is compressed. If it exceeds 3.0 mm, the overall thickness increases, and there is a possibility that the tracking ability will deteriorate.

[0025] The method for thickening the end portion is not particularly limited, but may be, for example, sewing the end portion with a machine, inserting a core material and overlocking the end portion. EXAMPLES

[0026] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these. First, the methods for measuring and evaluating the characteristics used in the present invention will be described.

[0027] (Blade resistance) The butterfly knife and weight together had a load of 2.8 kg, and when it was dropped vertically from a height of 90 cm, the penetration length to the back side of the sample was confirmed. The sample was placed on top of the chloroprene rubber, with the tip of the knife in the center of the metal piece. Samples that did not have the blade penetrate the back side were OK, and samples with a penetration length of more than 0 mm were NG.

[0028] (Following ability) A row of metal pieces was cut into pieces approximately 4 cm long in both the vertical and horizontal directions, and the radius of curvature R was measured when the pieces were bent by hand. R was calculated using the following formula. When the width of the arc is W and the height of the arc is h, R = ((W / 2) × (W / 2) + (h × h)) / 2h The evaluation was conducted based on the following criteria: R below 100 for both the vertical and horizontal directions was OK, and R above 100 was NG.

[0029] (Size of metal piece) To determine the size of the metal piece, the lengths of the metal piece in the vertical and horizontal directions as viewed in Figure 1 after it had been pressed onto the tape-like fabric were measured with a vernier caliper, and the product of the obtained values ​​was calculated.

[0030] <Example 1> A mold was made so that the metal piece would be 1.0 cm long, 1.0 cm wide, 3.6 mm thick, and have the cross-sectional shape shown in Figure 3. After that, brass (Mohs hardness 3) was poured into the mold and the metal piece was made in the usual manner.

[0031] A 2-1 twill fabric with a width of 1.0 cm and a density of 31 x 31 threads / inch (2.54 cm) was produced using 1100 dtex aromatic polyamide fiber "Kevlar" (registered trademark) K29 (manufactured by Dupont, aromatic polyamide fiber with a strength of 20 cN / dtex), and this was used as a tape-like fabric. The above-mentioned "Kevlar" (registered trademark) thread was placed on the edge of this fabric, and the edge was oversewn so that the thickness was 2.0 mm thicker than the center. The longitudinal direction of the completed tape-like fabric was the warp, and the width direction was the weft.

[0032] Using a press machine, one side of the above metal pieces was sandwiched continuously in the vertical direction at intervals of 0.50 mm on one side of the width direction of the tape-like fabric, and then metal pieces were similarly sandwiched on the other end of the width direction of the tape. This process was repeated in the horizontal direction, and the tape was cut to a length of 100±20 cm. 2 Samples of this size were prepared.

[0033] The test results for the blade resistance and followability of this sample are shown in Table 1.

[0034] <Example 2> A mold as shown in Figure 3 was created so that the metal piece would be 0.5 cm long, 0.5 cm wide, and 2.4 mm thick, with a cross-sectional shape as shown in Figure 3. Then, SUS304 (Mohs hardness 5) was poured into the mold and the metal piece was created in the usual manner.

[0035] The tape-shaped fabric of Example 1 was overcasted so that the ends were 1 mm thicker than the center. Except for setting the gap between the metal pieces to 0.20 mm, samples were prepared by sandwiching the metal pieces between the tape-like fabric in the same manner as in Example 1, and evaluation was performed. The results are shown in Table 1.

[0036] <Example 3> A mold was made so that the metal piece would be 1.8 cm long, 1.8 cm wide, and 3.4 mm thick, with a cross-sectional shape as shown in Figure 3. Aluminum (Mohs hardness 2) was then poured into the mold and the metal piece was made in the usual manner.

[0037] The tape-shaped fabric of Example 1 was woven to a width of 1.5 cm and overlocked so that the ends were 2.5 mm thicker than the center.

[0038] Except for setting the gap between the metal pieces to 0.90 mm, samples were prepared by sandwiching the metal pieces between the tape in the same manner as in Example 1, and evaluation was performed. The results are shown in Table 1.

[0039] <Example 4> A mold was made so that the metal piece would be 1.0 cm long, 1.0 cm wide, 3.8 mm thick, and have the cross-sectional shape shown in Figure 3. After that, copper (Mohs hardness 3) was poured into the mold and the metal piece was made in the usual manner.

[0040] Using the tape-like fabric that had been oversewn in Example 1, a metal piece was sandwiched between the fabric with a gap of 0.30 mm between the metal pieces to prepare a sample for evaluation. The results are shown in Table 1.

[0041] <Comparative Example 1> A mold was made so that the metal piece would be 4.0 cm long, 4.0 cm wide, and 4.0 mm thick, with a cross-sectional shape as shown in Figure 3. Then, brass was poured into the mold to produce the metal piece in the usual manner.

[0042] The tape-shaped fabric of Example 1 was woven to a width of 4.0 cm and overlocked so that the ends were 3.0 mm thicker than the center.

[0043] A sample was prepared by sandwiching the metal pieces between the tape in the same manner as in Example 1, except that the gap between the metal pieces was set to 0.05 mm, and the sample was evaluated. The conformability was NG. The results are shown in Table 1.

[0044] <Comparative Example 2> A mold was made so that the metal piece would be 0.5 cm long, 0.5 cm wide, 1.8 mm thick, and have a cross-sectional shape as shown in Figure 3. Aluminum was then poured into the mold to produce the metal piece in the usual manner.

[0045] Using the tape-like fabric of Example 2, a sample was prepared by sandwiching the metal pieces between the tape in the same manner as in Example 2, except that the gap between the metal pieces was set to 2.00 mm, and the cut-proof property was evaluated as NG. The results are shown in Table 1.

[0046] [Table 1] [Industrial Applicability]

[0047] The knife-resistant material according to the present invention can be used not only as knife-resistant protective clothing worn by police officers, security guards, etc. as described above, but also in private sector work involving the use of knives. [Explanation of symbols]

[0048] 1: Metal piece 2: Tape-like fabric 3: Cut-resistant material

Claims

1. A cut-resistant material made by connecting metal pieces arranged in a continuous line, with tape-like fabrics sandwiched on both sides. The size of the aforementioned metal piece is 0.25 cm. ２ 4cm or more ２ It is less than and all sides are 2 cm or less. The gap between adjacent metal pieces is 0.1 mm or more and less than 1 mm. A cut-resistant material characterized by having a thickness of 2 mm or more and less than 4 mm.

2. The anti-cut material according to claim 1, characterized in that the metal piece has a Mohs hardness of 2 or more and 5 or less.

3. The cut-resistant material according to claim 1 or 2, characterized in that the tape-like fabric is made of high-strength fibers with a strength of 17 cN / dTex or higher.

4. The cut-resistant material according to claim 1 or 2, characterized in that the ends of the tape-shaped fabric are 0.1 mm to 3.0 mm thicker than the central part.

Images