JPS61275440A - Elasticity resistant cloth for bulletproof jacket - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a bulletproof woven fabric for bulletproof clothing, and in particular, to a bulletproof pad made by laminating woven fabrics made of high-tensile fibers woven with satin weave. The present invention relates to a bulletproof woven fabric for bulletproof clothing that has a high bulletproof performance, is lightweight, improves wearability, and has improved practicality.

[Prior art] High-strength AR fires high-strength AR to remove bullets or shell fragments flying at high speed.
Bulletproof clothing that blocks bullets, etc. by applying it as a bat-shaped laminated woven fabric using TS to desired parts of the body has been used in practical use for a long time, using woven fabric made from high-strength nylon thread. Recently, aramid fibers with a high tensile strength of 300 kg/mrn' class have been put into practical use, and they have become more efficient.
It has been developed as a lightweight body armor. An example of such bulletproof clothing is shown in FIG. In the figure, 6 indicates bulletproof clothing, and this bulletproof clothing 6 is composed of an outer jacket 8 and a bulletproof bat 7 housed inside the outer jacket 8.

Since the load force of bullets, etc. increases in proportion to MV (M is the mass, ■ is the landing speed), the bulletproof pad 7 of the bulletproof clothing 6 absorbs the kinetic energy E (E = M V2/ 2 ) caused by this. It is necessary to maintain sufficient strength to stop the projectile.

In addition, the penetrating force of this bullet etc. is affected by the tip shape, energy density, hardness, etc. of the colliding bullet, etc., but the energy density of a pointed bullet at the impact surface is higher than its average energy density. Therefore, by covering the surface of the bulletproof woven fabric with a hard material such as hard steel or aluminum alloy to make a bulletproof bat, the sharp part of the tip of the pointed bullet can be destroyed. It is smoothed and further expanded into a so-called pine mushroom shape, which is larger than the original diameter.
Increasing the surface area to reduce energy density and penetration power is used to prevent high-powered, pointed rifle bullets. In this case, a silicon nitride ceramic plate with high hardness and high strength is particularly effective as the hard member.

On the other hand, in the case of non-pointed shell fragments, or in the case of raised bullets with round bullet heads and relatively low bullet velocity upon impact, for example, a woven fabric such as aramid (aromatic polyamide woven fabric) is used. A bulletproof bat made of ~30 laminated bats is used.

[Problems to be Solved by the Invention] However, as will be described in detail later, the woven fabric made of aramid or the like constituting the conventional bulletproof bat as described above has warp threads 3 and weft threads as shown in Figure 5.6. 4 and 4 are woven by plane weaving, alternately crossing each other up and down,
This is a so-called plain weave woven fabric 5, and in the case of this plain woven fabric 5, the threads are often entangled, there is little slippage of the threads when the bullet hits, and there is less freedom in deforming the woven fabric, so it is not bullet resistant. It was a weak organization. In addition, such a plain-woven fabric 5 may be used, for example, at a weaving density (the number of warp and weft yarns per 1 inch of fabric width) of 30, and a weight of one woven fabric of 1300 g.
/rn' are laminated in 10 to 30 sheets and used as a bulletproof bat. In addition, plane weaving here means l
This refers to a method of weaving in which threads such as weft and warp threads are intertwined in an appropriate manner within a plane, and is not a three-dimensional weave.

When using such a bulletproof bat as bulletproof clothing for the upper body of the human body, the covered area of the front and back should be 40 cm each.
Since the size is about 40 cm, the weight W is about 2 to 3 kg.
It has also reached However, in the case of human bulletproof clothing, weight is a fundamentally important consideration from its wearability, and it is desired that it be both high performance and lightweight, and it is destined that its practicality will improve with lightness. have.

[Means for Solving the Problems] The present invention has been intensively researched in view of the above-mentioned problems, and focuses on the weaving structure of the threads constituting the woven fabric, and specifies the weaving structure. It was discovered that when carried out under certain conditions, high bullet resistance performance can be obtained or the weight can be halved.

That is, the present invention uses warp yarns and weft yarns having high tensile strength.
A 4- to 8-strand satin weave fabric is formed by plane weaving, with 4 to 8 strands intersecting each other vertically at one pitch, and these woven fabrics are laminated to form a bulletproof bat. In a more preferred embodiment, the warp and weft yarns constituting the woven fabric have a tensile strength of 250 to 350 kg/mm''.
Aramid yarn with a thickness of 300 to 1
It is 200 denier and has a weave density of 15 to 50 fibers (per inch width).

The fibers constituting the warp and weft that can be used in the present invention are not particularly limited as long as they have high tensile strength, such as aramid (aromatic polyamide) fiber, nylon fiber, poron fiber, silicon carbide fiber. , glass fiber, carbon fiber, etc. are used. Among these, especially
Aramid fibers with a tensile strength of 250 to 350 Kg/mrn' are light and versatile, making them practical.
It is suitable because its tensile strength is about three times that of nylon fiber. In this case, if the tensile strength is lower than the above-mentioned range, the energy absorption effect when a bullet or the like impacts is not sufficiently exerted, and the fabric is unsuitable for use as a bulletproof fabric.

Furthermore, fibers larger than the above range are not practical or practical from the viewpoint of cost and production.

The weaving pitch of the satin weave in the present invention is optimally set to 4 to 8 pitches. If the pitch is less than 3, as will be described later, the ballistic performance deteriorates due to reasons such as a decrease in the degree of freedom of sliding of the threads of the woven fabric as it approaches a plain weave weave.

In addition, beyond 8 pitches, not only does it tend to be difficult to weave, but the completed woven fabric becomes extremely pliable, making it difficult to maintain its original shape. The process of making it is similarly difficult as it loses its shape, and even when worn, it loses its original shape, making it difficult to handle and of little practical use.

Next, the tensile strength of the present invention is 250 to 350 Kg/mm.
In the case of the aramid yarn No. 2, preferably the yarn thickness is 300~
1200 denier, weaving density is 15-50 (per inch)
Regarding the thread thickness, generally speaking, the thicker the thread, the higher the ballistic resistance.

If it exceeds 1200 denier, the thread becomes thicker.

If the entanglement of the threads becomes too strong, the degree of freedom of the threads will decrease as described above, making it difficult to avoid local front molding, and if the thread is thinner than 300 denier, appropriate ballistic resistance will not be obtained. On the other hand, regarding the weave density, generally the thinner the weave, the higher the ballistic resistance. However, if the overall weight is the same, the weight per piece of woven fabric is lighter when it is thinner, which results in an increase in the number of laminated layers, resulting in a bulkier body armor. In the case of this human body bulletproof clothing, since the total thickness also affects the wearability next to the weight, it is naturally necessary to set a weave density of a certain thinness as the lower limit. On the other hand, if the woven fabric is too sparse (thin), it will not be able to maintain its original shape as a woven fabric, and there are certain restrictions from this point of view as well. From this point of view, the weave density within the aforementioned range is determined.

The bulletproof bat of the present invention can have high ballistic resistance or be lightweight by appropriately selecting and specifying the weaving conditions as described above.

In the case of the warp or weft yarns constituting the woven fabric of the present invention, for example, in the case of aramid yarns, several hundred filaments (fibers) with a diameter of about 1/100 mm are written as yarns of various thicknesses. provided.

The bulletproof bat of the present invention is generally constructed by laminating 10 to 30 pieces of satin-woven fabric as described above.

[Function] As described above, the bulletproof bat of the present invention is constructed by laminating a large number of sheets of satin-woven fabric under specific conditions, and these are integrated in terms of the bullet-stopping mechanism. It works as follows.

In this case, one bullet is wrapped around 172 to 2/3 of the number of laminated layers and stopped, and on the other hand, the woven fabric is deformed backwards (in the bullet's traveling direction) into a circular cross section and a cone shape around this impact area. arise. Therefore, the unpierced rear 172 to 1/3 layer acts as a back-up layer (vk side support layer) for the penetrated front half layer.

In this case, the tension applied to each layer of the woven fabric is greatest in the first layer (surface side) and gradually decreases. The first half of the layer up to the point where the bullet stops generates a penetration resistance force against the penetrating bullet, reducing its penetration energy and lowering the strength of the child. The thread is not strong enough and breaks.

The strength of the fabric in the latter half of the layer is superior to the penetrating power of bullets, and even though the bullet deforms backward, it does not break and stops the bullet.

In addition, in the case of a biaxial plane-woven fabric, the load caused by a bullet or the like that collides with the plane of the woven fabric in a direction approximately perpendicular to the woven fabric is mainly caused by its longitudinal (
A tensile resistance force is generated in the direction of each thread (fiber) of the weft threads, thereby supporting and stopping the bullet. As described above, when the warp (weft) thread is an aramid thread, several hundred filaments each having a diameter of approximately 17,100 mm are formed into a thread having a desired thickness. The tensile strength reaches approximately 300 kg/mrn'', and the strength per unit area reaches approximately twice that of nylon thread and approximately three times that of steel wire.

On the other hand, in the bullet stopping mechanism, the force applied to one vertical (horizontal) thread is restrained and supported by the mutually entangled horizontal (warp) threads.

Here, the bullet stopping effect of the satin weave fabric of the present invention will be explained while comparing it with that of a conventional plain weave fabric.

In this case, the warp (weft) threads constituting each woven fabric are the same in material strength, thickness, and weaving density (number of threads per unit width, thread spacing), and only the weaving structure is different as described above. .

Figures 1 and 2 show a satin weave fabric structure according to an embodiment of the present invention, in which 3 warp threads and 4 weft threads are arranged at a pitch of 4 threads.
This figure shows the structure of a four-strand satin weave fabric I in which the lines intersect vertically.

FIGS. 3 and 4 show the structure of a satin weave fabric according to another embodiment of the present invention, in which an eight-strand satin weave fabric 2 in which warp threads 3 and weft threads 4 intersect vertically at a pitch of eight threads is shown. This is a diagram showing the organization of .

5 and 6 show an example of the structure of a conventional plain weave fabric 5. FIG. In this case, the warp threads 3 and the weft threads 4 alternately intersect vertically one by one.

Now, the bullet stopping effect of the structure of the four-strand satin weave fabric 1 of the present invention and the structure of the conventional plain weave fabric 5 will be explained based on FIGS. 1 and 5, respectively.

When a load is applied to the R point on the woven fabric of the above-mentioned woven structure, in the four-wood satin woven fabric 1 of the present invention, as shown in FIG. It is supported at two points, Ml and M2, and receives loads at a total of eight points.

On the other hand, in the conventional plain weave fabric 5, as shown in FIG.
They are each restrained and supported at two points, and initially the same load is applied to a total of four points.

Therefore, in the case of the four-strand satin woven fabric 1, the same load is received at twice as many support points as the plain woven fabric 5.

In addition, the distance to this support point is 8P (vertical) / 4F (horizontal) in the case of 4-strand satin weave woven fabric 1, and 4P (vertical) / 2P (horizontal) in the case of plain-woven fabric 5, which means 4 strands. In the case of the satin woven fabric 1, the support interval is twice as large.

For this reason, compared to the plain weave fabric 5, the 4-strand satin weave fabric 1 is (1) There are many support points, and stress is dispersed and averaged.

(2) Since the support interval is long, the elongation (sliding) of the yarn is large, which alleviates local concentrated loads, and also distributes and averages stress across more yarns, including the yarns of the next layer of laminated fabric. do.

(3) The pull-out resistance force in the thread direction (X direction in the figure) of the warp (horizontal) thread body caused by the entanglement of the weft (warp) threads is higher for the 4-wood satin woven fabric l, which has less entanglement, than for the plain weave. It is smaller than the woven fabric 5 and therefore easily slips and deforms in the yarn direction, thereby relieving the locally concentrated load at the R point and dispersing and averaging the stress.

(4) The degree of freedom of the warp (weft) yarn in the direction perpendicular to the yarn axis (in the Y direction in the figure) is large, and the yarn at that part is likely to be displaced (shifted) in the direction perpendicular to the axis in response to a local load at point R. Similar to the above, when enveloping and blocking a bullet, avoid concentrating the load on a specific thread,
More threads act on enveloping and blocking, resulting in high ballistic resistance as a whole.

As mentioned above, when the threads constituting the woven fabric are the same and the weaving density is the same, the conventional plain woven fabric 5 has little freedom of deformation, and by applying a load with a relatively small number of threads, etc. It is difficult to disperse local loads, and it is difficult to develop resistance due to the high tensile strength that is characteristic of aramid threads, and relatively weak shearing forces are likely to occur, which can easily cause breakage. It has a structure that is vulnerable to bullet resistance.

On the other hand, the satin weave fabric structure of the present invention has a large degree of freedom in deformation, etc., as described above, and the vertical (horizontal)
The load is generally distributed over the yarn and each of the laminated yarns in the next and subsequent layers, and the shearing force is less likely to occur, resulting in flexibility and excellent ballistic resistance.

When such a sateen woven fabric according to the present invention is used as a layer and the same weight is used as bulletproof clothing, bulletproof performance several times that of the plain woven fabric can be obtained. Alternatively, the weight can be reduced accordingly.

[Example] Next, the present invention will be explained in detail.

In this example, aramid (aromatic polyamide) yarn with a tensile strength of 300 Kg/mm'' class was used as the fiber having high tensile strength, and as shown in Figs. are made into 4-strand and 8-strand satin weave fabrics 1.2 by plane weaving, respectively, and these are made into 20 to 30
A laminated sheet was used as a test sample. In addition, warp 3. Weft thread 4
The thickness of the threads that make up the thread is 380 denier and 1140 denier, and the weaving density (number of threads per 1 inch width) is 49 threads and 22 threads in the length and width when the thread thickness is 380 denier, and the thread thickness is 1.
For 140 denier, vertical.

Both sides were made of 17 wood, and differences in bullet resistance performance due to various weave structures, thread thicknesses, and weave densities were compared.

Then, a bullet weighing 1.1 g, made of hard steel, and having a cylindrical shape was fired at a landing speed of 600 m/s.
The bullet was shot under the condition that the bullet energy at the time of impact was approximately 20 Kgam, and the actual energy at the time of impact for each sample of the bullet was calculated as the absorbed energy (ΔE Kgllm) by measuring the bullet speed.

Observe the number of penetrated sheets of each sample, calculate the weight, and calculate the absorbed energy (ΔE) by the weight of the sample (W
The value divided by Kg/m'') was determined as the energy absorption coefficient M.

For comparison, a bullet resistance test was also conducted under the same conditions for conventional plain weave woven fabric 5 under the same conditions such as yarn thickness and weaving density, and was used as a comparative example.

In addition, as another comparative example, a bullet resistance test was conducted under the same conditions for Woven Fabric 5, which has a plain weave structure used in conventional bulletproof clothing, with a thread thickness of 1140 denier and a weave density of 30 wood/inch. , was used as a reference comparative example.

The results of these tests are shown in Table 1 and FIG. In addition, FIG. 7 shows the test results in Table 1 in a graph, and compares the energy absorption coefficient M of the satin woven fabric 1.2 of the example with that of the plain woven fabric 5 of the comparative example. This is what is shown. In FIG. 7, solid lines m and n indicate the cases of 4-strand satin weave and 8-strand satin weave of this example, respectively, and the broken lines indicate the case of plain weave of the comparative example. J indicates the sample code.

As is clear from FIG. 7 and Table 1, the energy absorption coefficient M of the bulletproof woven fabric of this example is 2.2 to 3.82 for the plain woven fabric of the comparative example. In the case of 4-strand satin weave, it is 4.29 to 5.5. In the case of 8-strand satin weave, it is 5.7 to 6.34, and when used as bulletproof clothing of the same weight, it has about twice the bullet resistance. It was found that performance was obtained. This means that the weight (number of laminated layers) can be halved if the ballistic performance is the same.

[Effects of the Invention] As is clear from the above description, the bulletproof woven fabric for bulletproof clothing of the present invention is significantly more flexible and lightweight than conventional plain weave woven fabrics, and has significantly higher bulletproof resistance. It has performance. Moreover, compared to conventional bulletproof woven fabrics, the number of laminated layers is significantly smaller, and together with the reduction in weight, the wearability can be significantly improved.

[Brief explanation of drawings]

FIGS. 1 and 2 show an embodiment of the present invention, and show the structure of a four-strand satin woven fabric, with FIG. 1 being a plan view and FIG. 2 being II-- A sectional view taken along the line II, FIGS. 3 and 4 show other embodiments of the present invention, and show the structure of an 8-strand satin woven fabric. FIG. 3 is a plan view, and FIG. The figure is a sectional view taken along the line ■ to ■ in Figure 3, Figures 5 and 6 show the structure of a conventional plain weave fabric, Figure 5 is a plan view, and Figure 6 is a cross-sectional view of Figure 5. Figure 7 is a graph showing the energy absorption coefficient of the bulletproof woven fabric of the present invention compared to that of a conventional plain-woven fabric, and Figure 8 shows an example of bulletproof clothing. FIG. 1...4-strand satin woven fabric, 2...8-strand satin woven fabric, 3...warp, 4...weft, R
・・・・・・Point of impact, 5・・・ Plain weave woven fabric. 6...Bulletproof clothing, 7...Bulletproof bat. Patent applicant: Ube Industries, Ltd. Figure 1 Figure 3

Claims (2)

[Claims] (1) A 4- to 8-strand satin woven fabric is formed by weaving high-tensile strength warp and weft yarns by plane weaving, intersecting each other vertically with 4 to 8 yarns per pitch. A bulletproof woven fabric for bulletproof clothing, characterized in that the woven fabric is laminated to form a bulletproof pad. (2) The warp and weft yarns constituting the woven fabric are aramid yarns with a tensile strength of 250 to 350 kg/mm^2, the thread thickness is 300 to 1200 deniers, and the weaving density is 15 to 50 threads (1 inch width). A bulletproof woven fabric for bulletproof clothing according to claim 1, characterized in that the bulletproof woven fabric is made of: