KR20130075190A - Composite fabric for ballistic helmet and ballistic helmet comprising the same - Google Patents

Abstract

PURPOSE: A complex cloth for a bulletproof helmet and a bulletproof helmet including the same are provided to implement an improved bulletproof performance in a light weight. CONSTITUTION: A complex cloth for a bulletproof helmet comprises two first fabric (110) formed with a high intensity fiber, any one of second fabric (210) formed with the high intensity fiber and located between the two first fabrics, and any one of unidirectional fabric between any one of the first fabric and the second fabric. The first fabric is dipped to the first composition (120), the second fabric is cated with the second composition (220), and the unidirectional fabric comprises adjacent the first and the second fabric. The high intensity fiber of the first fabric layer and the high intensity fiber of the second fabric are arragned in different direction.

Description

{Composite Fabric for Ballistic Helmet and Ballistic Helmet Comprising The Same}

The present invention relates to a composite fabric for a bulletproof helmet and a bulletproof helmet comprising the same, and more particularly, to a bulletproof helmet composite fabric capable of realizing an improved bulletproof performance despite its relatively light weight and a bulletproof helmet comprising the same do.

Bulletproof products are products for protecting the human body from bullets and shells, and are required to have excellent bulletproof performance and light weight. However, in order to improve the bulletproof performance, it is common to sacrifice some of the lightness of the bulletproof product. On the contrary, it is common for the weight reduction of a bulletproof product to cause a decrease in bulletproof performance.

It is known to use unidirectional fabrics to reduce the weight of bulletproof products and to improve bulletproof performance.

On the other hand, US Patent Publication No. US2011 / 0219943 proposes a composite fabric including both a woven fabric of high strength fibers and a unidirectional fabric of high strength fibers in order to improve ballistic performance. The publication teaches that it is preferable that the fabric of the composite fabric is not coated with a matrix resin, and that when it is coated, it is desirable to be coated with a matrix resin having the same or similar chemical structure as that of the unidirectional fabric. Paragraph (0054)), that bulletproof products comprising both woven and unidirectional fabrics not only have better ballistic performance than bulletproof products containing only unidirectional fabrics, but can further reduce rearward deformation due to bullet collisions. It is described (see the publication paragraph [0054]).

Although the composite fabric proposed by the above publication exhibits excellent anti-bullet characteristics, there still remains room for improvement in terms of weight saving of the bulletproof article, improvement of the bulletproof performance, and reduction of the rear surface deformation.

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a composite fabric for a bulletproof helmet and a bulletproof helmet comprising the same, which can prevent problems due to the limitations and disadvantages of the related art.

One aspect of the present invention is to provide a composite fabric for a bulletproof helmet capable of realizing an improved bulletproof performance despite being relatively lightweight.

Another aspect of the present invention is to provide a bulletproof helmet which is capable of realizing excellent bulletproof performance while remarkably reducing the rear surface deformation due to bullet impact even though it is relatively light.

Other features and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description. Alternatively, other features and advantages of the present invention may be understood through practice of the present invention. The objects and other advantages of the present invention will be realized and attained by the structure specified in the description and claims.

To achieve these and other objects and in accordance with the purpose of the invention, there are provided two first fabrics formed of high strength fibers; At least one second fabric positioned between the two first fabrics and formed of high strength fibers; And at least one unidirectional fabric between any one of the first fabrics and the second fabric, wherein each of the first fabrics is impregnated with a first composition and the second fabric is impregnated with a second composition Wherein the unidirectional fabric comprises first and second fibrous layers bonded to each other, wherein each of the first and second fibrous layers comprises unidirectionally oriented high strength fibers, And the high-strength fibers of the first fiber layer and the high-strength fibers of the second fiber layer are arranged in different directions.

As another aspect of the present invention, there is provided a semiconductor device comprising: an outer layer; An inner layer; At least one first intermediate layer between the outer layer and the inner layer; And at least one second intermediate layer between the inner layer and the first intermediate layer, wherein each of the outer layer and the inner layer comprises a first fabric of high strength fibers impregnated with a first composition, And a second fabric of high strength fiber coated with a second composition, wherein the second intermediate layer comprises first and second fiber layers bonded together, wherein each of the first and second fiber layers is arranged in one direction Wherein the high strength fibers of the first fiber layer and the high strength fibers of the second fiber layer are arranged in different directions.

The bulletproof helmet manufactured by using the composite fabric for the bulletproof helmet of the present invention is remarkably reduced in the rear surface deformation due to the bullet collision and the bulletproof performance can be realized even though the bulletproof helmet is relatively light in weight.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
1 is an exploded cross-sectional view of a composite fabric for a bulletproof helmet according to an embodiment of the present invention,
2 to 4 are sectional views of unidirectional fabrics according to other embodiments of the present invention,
5 is a schematic view of a bulletproof helmet according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a composite fabric for a bulletproof helmet and a bulletproof helmet including the same according to the present invention will be described in detail with reference to the accompanying drawings.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. It will be apparent to those skilled in the art that variations are possible. Therefore, the present invention encompasses all changes and modifications that come within the scope of the invention as defined in the appended claims and equivalents thereof.

The term 'high strength fiber' as used herein refers to a fiber having a tenacity of at least 11 g / denier and a tensile modulus of at least 200 g / denier.

The term " impregnation " as used herein means that the composition wraps the fibers constituting the fabric by the presence of the fabric in the composition.

The term " coating " as used herein means that the composition is only present on the surface of the fabric.

1 is an exploded cross-sectional view of a composite fabric for a bulletproof helmet according to an embodiment of the present invention.

1, a composite fabric for a bulletproof helmet according to an embodiment of the present invention includes two first fabrics 110 formed of high-strength fibers, a second fabric 100 formed of two first fabrics 100, At least one second fabric (210) formed of high strength fibers; And at least one unidirectional fabric (300) between any of the first fabrics (110) and the second fabric (210).

Each of the first fabrics 110 including the warp yarns 111 and the weft yarns 112 is impregnated with the first composition 120. That is, since the first fabric 110 is present in the first composition 120, the first composition 120 covers the fibers 111 and 112 constituting the first fabric 110. The first fabric 110 and the first composition 120 wrapping it form a first prepreg 100.

The warp 111 and the weft yarn 112 constituting the first fabric 110 may be ultra high molecular weight polyethylene (UHMWPE) or aramid fibers, Has a surface density of 150 to 520 g / m < ^{2 &} gt ;. If the surface density is less than 150 g / m ² , there may be gaps in the fabric, which may cause a decrease in ballistic performance. On the other hand, weaving the area density exceeding 520 g / m ² causes a decrease in production efficiency.

The first composition 120 impregnated in the first fabric 110 may include a urethane resin or a phenol resin and may further include a small amount of a polyvinyl butyral resin as an additive for imparting softness.

According to an embodiment of the present invention, the first fabric 110 is a fabric including aramid fibers having a fineness of 600 to 3000 denier as warp and weft yarns (111, 112) and a surface density of 150 to 520 g / m ² And a weight ratio of the first composition 120 to the first fabric 110 is 20 to 38%. If the weight ratio is less than 20%, the first composition 120 can not sufficiently protect the first fabric 110, so that the first fabric 110 can be easily damaged by external friction. On the other hand, if the weight ratio exceeds 38%, a lightweight bulletproof helmet can not be produced due to an increase in weight of the composite fabric.

The second fabric 210, including the warp yarns 211 and the weft yarns 212, is coated with a second composition 220. That is, the second composition 220 is present only on one surface of the second fabric 210. The second fabric 210 and the second composition 220 on its surface form a second prepreg 200.

The warp yarns 211 and the weft yarns 212 constituting the second fabric 210 may be ultrahigh molecular weight polyethylene fibers or aramid fibers and the second fabrics 210 may be fabricated by the same method as the first fabrics 110, It is preferred that the surface density is 520 g / m < ² >.

The second composition 220 comprises 20 to 70% by weight of a phenolic resin, 20 to 70% by weight of a polyvinyl butyral resin, and 1 to 10% by weight of a plasticizer. The plasticizer may be dioctyl phthalate (DOP), dioctyl adipate (DOA), tricresyl phosphate (TCP), or diisononyl phthalate (DINP). When the content of the polyvinyl butyral resin is less than 20% by weight, the adhesion and moldability of the second prepreg 200 may be deteriorated.

According to an embodiment of the present invention, the second fabric 210 is a fabric including aramid fibers having a fineness of 600 to 3000 denier as warp and weft yarns 211 and 212, and 150 to 520 g / m ^2. It has a surface density of and the weight ratio of the second composition 220 to the second fabric 210 is 10 to 18%. When the weight ratio is less than 10%, the adhesion between the second prepregs 200 and the adhesion between the first prepreg 100 and the second prepreg 200 may be weakened, thereby lowering ballistic performance. On the other hand, if the weight ratio is more than 18%, the object of the present invention of lightening the composite fabric can not be achieved.

The unidirectional fabric 300 includes first and second fibrous layers 310 and 320 bonded to each other, wherein each of the first and second fibrous layers 310 and 320 is unidirectionally oriented, Strength fibers 311 and 321 and the high-strength fibers 311 of the first fiber layer 310 and the high-strength fibers 321 of the second fiber layer 320 are arranged in different directions. For example, the first and second fibrous layers 310 and 320 are cross-plied at about 90 degrees.

The high strength fibers 311 and 321 of the first and second fibrous layers 310 and 320 may be ultra high density polyethylene fibers or aramid fibers.

The high strength fibers 311 and 321 of the first and second fibrous layers 310 and 320 may be impregnated or coated with the third composition 312 and 322. 1 illustrates that the high strength fibers 311 and 321 of the first and second fibrous layers 310 and 320 are impregnated with the third composition 312 and 322. However, The surface of at least one of the high strength fibers 311, 321 of the first and second compositions 310, 320 may be partially coated with the third composition 312, 322.

The third composition (312, 322) comprises a polyurethane resin.

Alternatively, as illustrated in FIG. 2, the unidirectional fabric 300 of the present invention may further include third and fourth fiber layers 330 and 340. Each of the third and fourth fiber layers 330 and 340 includes unidirectionally oriented high strength fibers 331 and 341. The high strength fibers 331 and 341 may be ultra high density polyethylene fibers or aramid fibers and may be impregnated or coated with a fourth composition 332 and 342 comprising a polyurethane resin. In this case, the first to fourth fiber layers 310, 320, 330, and 340 are formed such that the rotation angles of the high strength fibers 311, 321, 331, and 341 are 0 ° / 90 ° / 0 ° / Can be bonded.

Alternatively, the unidirectional fabric 300 of the present invention may further comprise two polymer films 350. In this case, as illustrated in FIG. 3, first and second fibrous layers 310 and 320 are disposed between the two polymer films 350. Similarly, when the unidirectional fabric 300 of the present invention includes the first to fourth fiber layers 310, 320, 330 and 340, as illustrated in FIG. 4, the first to fourth fiber layers 310, (310, 320, 330, 340) are disposed between the two polymer films (350).

The polymer films 350 may comprise a polyolefin resin. The polymer films 350 may be formed by joining between the unidirectional fabrics 300, bonding between the unidirectional fabric 300 and the first prepreg 100, and bonding between the unidirectional fabric 300 and the second prepreg 300. [ And the adhesive layer 200 may be bonded to each other.

As illustrated in FIG. 5, the bulletproof helmet 10 of the present invention, which is manufactured using the composite fabric for a bulletproof helmet described above, includes an outer layer 11 directly contacting the bullet, At least one first intermediate layer 13 between the outer layer 11 and the inner layer 12 and at least one second intermediate layer 13 between the inner layer 12 and the first intermediate layer 12, And at least one second intermediate layer (14) between the second intermediate layer (13).

Each of the outer layer 11 and the inner layer 12 includes a first fabric 110 of a high strength fiber impregnated with the first composition 120 or a first prepreg 100.

The first intermediate layer 13 includes a second fabric 210 of a high strength fiber coated with the second composition 220, that is, a second prepreg 200.

The second intermediate layer 14 includes first and second fibrous layers 310 and 320 bonded to each other, and each of the first and second fibrous layers 310 and 320 has high strength fibers 311 and 321. The high strength fibers 311 of the first fiber layer 310 and the high strength fibers 321 of the second fiber layer 320 are arranged in different directions.

Hereinafter, a composite fabric for a bulletproof helmet and a method for manufacturing the bulletproof helmet of the present invention will be described in detail.

1st In the prepreg 100,  Produce

First, the first fabric 110 is obtained by weaving high strength fibers 111, 112 having a tensile modulus of at least 11 g / denier and a tensile modulus of at least 200 g / denier. As described above, the high strength fibers 111 and 112 may be ultra high molecular weight polyethylene fibers or aramid fibers. According to an embodiment of the present invention, a first fabric 110 having a surface density of 150 to 520 g / m ² is manufactured using aramid fibers having a fineness of 600 to 3000 deniers as warp and wefts 111 and 112 do.

Specifically, an aromatic polyamide polymer is prepared by polymerizing an aromatic diamine and an aromatic diacid chloride in a polymerization solvent, spinning the spinning dope containing the aromatic polyamide polymer through a spinneret, and spinning the spinning dope Coagulated, washed, and dried to produce aramid fibers having a fineness of 600 to 3000 denier. After the warp beam is manufactured by applying the aramid fiber to the warp yarn, the warp beam is installed on the weaving machine and the aramid fiber is applied as a weft yarn to complete the first fabric 110.

The first fabric 110 is then dipped in the first composition 120 diluted with a solvent (e.g., methanol) for 10 to 60 minutes. The first composition 120 includes a phenolic resin and may optionally further include a small amount of polyvinyl butyral resin as an additive for imparting ductility. The dipping process may be repeated several times so that the entire first fabric 110 may be uniformly impregnated with the first composition 120.

The dilute solvent is then removed from the first fabric 110 impregnated with the first composition 120 by the dipping process through a drying process to obtain the first prepreg 100. The drying process can be continuously performed by passing the first fabric 110 impregnated with the first composition 120 at a predetermined speed in a chamber maintained at a predetermined temperature.

Meanwhile, in order to control the content of the first composition 120 in the first prepreg 100, a process of adjusting the concentration of the first composition 120 in the dipping solution may be performed. Further, before the drying process, the first fabric 100 impregnated with the first composition 120 may be further squeezed. For example, when the first fabric 110 is an aramid fabric having a surface density of 150 to 520 g / m ² , the weight ratio of the first composition 120 to the first fabric 110 To 20% to 38%.

The squeezing process may be performed continuously using a pressure roller, or may be performed discontinuously using a pressure plate.

Second In the prepreg 200,  Produce

First, the second fabric 210 is manufactured in the same manner as the first fabric 110 described above. According to an embodiment of the present invention, a second fabric 210 having a surface density of 150 to 520 g / m ² is manufactured using aramid fibers having a fineness of 600 to 3000 deniers as warp and weft yarns 211 and 212. do.

Apart from the fabrication of the second fabric 210, the second composition 220 is used to form a polymer film. The second composition 220 comprises 20 to 70% by weight of a phenolic resin, 20 to 70% by weight of a polyvinyl butyral resin, and 1 to 10% by weight of a plasticizer.

According to an embodiment of the present invention, the second fabric 210 is an aramid fabric having a surface density of 150 to 520 g / m ² , and the weight ratio of the second composition 220 to the second fabric 210 To 10% to 18% of the thickness of the polymer film.

The polymer film is then laminated onto one side of the second fabric 210. That is, laying the polymer film on one side of the second fabric 210, drying the second fabric 210 on which the polymer film is placed at 20 to 60 ° C for 1 to 7 minutes, And then applying pressure to the second fabric 210 and the polymer film at 130 ° C.

The step of laying the polymer film on one side of the second fabric 210 may be performed through a continuous or discontinuous process. According to the continuous process, the polymer film is placed on the second fabric 210 while the second fabric 210 and the polymer film are simultaneously fed by separate feed rollers, respectively. On the other hand, according to the non-continuous process, the polymer film is placed on the second fabric 210 after the second fabric 210 and the polymer film 220 having the same shape and size are aligned with each other.

The drying process may be continuously performed using a chamber or the like. In this case, the second fabric 210 on which the polymer film rests may be allowed to pass through the chamber (s) maintained at 20 to 60 占 폚 at a rate of 4 to 20 m / min. If the drying temperature is lower than 20 ° C, drying can not be smoothly performed. If the drying temperature is higher than 60 ° C, the second composition 220 of the polymer film is hardened and the adhesion of the second prepreg 200 is lowered .

The pressing process may be performed continuously using a heated pressure roller, or may be performed discontinuously using a pressure plate.

Unidirectional  Fabrication of fabric 300

Each of the first and second fiber layers 310 and 320 forming the unidirectional fabric 300 is formed by supplying bundles of high strength fibers 311 and 321 and supplying the bundles of high strength fibers 311 and 321 Aligning the high strength fibers 311 and 321 in one direction in a substantially planar manner and impregnating or coating the high strength fibers 311 and 321 aligned in the one direction with the third composition 312 and 322. The third composition 312 or 322 may be sprayed onto the high-strength fibers 311 and 321 through a spraying method or may be applied to the high-strength fibers 311 and 321 in the form of a film.

The high strength fibers 311 and 321 of the first and second fibrous layers 310 and 320 may be ultra high density polyethylene fibers or aramid fibers and the third compositions 312 and 322 may include a polyurethane resin .

The first and second fibrous layers 310 and 320 are cross-bonded so that the high-strength fibers 311 and 321 of the first and second fibrous layers 310 and 320 form an angle of about 90 ° . When fabricating the unidirectional fabric 300 with the first to fourth fiber layers 310, 320, 330 and 340 as illustrated in FIG. 2, the first to fourth fiber layers 310, 320, 330, and 340 Are cross-bonded so that the rotation angles of the high-strength fibers 311, 321, 331 and 341 are 0 ° / 90 ° / 0 ° / 90 °.

Cross-joining of the first and second fibrous layers 310 and 320 may be performed through various methods. For example, the third composition 312 or 322 impregnated or coated on the first and second fibrous layers 310 and 320 may function as a bonding agent. Optionally, the first and second fibrous layers 310, 320 can be cross-bonded via an adhesive, a plastic film, or other suitable means. Such cross-junctions may be performed through a continuous cross-plying method.

As described above, the polymer film 350 may be attached to one or both sides of the cross-bonded first and second fiber layers 310, 320.

Manufacture of composite fabrics

When the first and second prepregs 100 and 200 and the unidirectional fabric 300 of the present invention are prepared through the above-described method, one to two first prepregs 100, five to thirty- The second prepregs 200, the five to thirty-five unidirectional fabrics 300, and the one or two first prepregs 100 are stacked in this order.

Then, by applying high temperature and high pressure to the laminate, the composite fabric for the bulletproof helmet of the present invention is completed. For the pressurization process, a device such as a heat press or autoclave may be used. The first and second compositions 120 and 220 and the third compositions 312 and 322 of the unidirectional fabrics 300 in the first and second prepregs 100 and 200 under high temperature and high pressure conditions, And functions as an adhesive.

Alternatively, a separate adhesive may be employed for bonding the first and second prepregs 100, 200 and the unidirectional fabric 300. The adhesive may be applied by a spray method, a dipping method, a roller coating method, a film attaching method, or the like. Heat and / or pressure may be applied to bond the first and second prepregs 100 and 200 to the unidirectional fabric 300 even when an adhesive is used.

Manufacture of bulletproof helmets

The composite fabric fabricated as described above is molded using a mold for manufacturing a helmet to complete the bulletproof helmet 10 of the present invention. The molding process can be performed at a temperature of 120 to 160 ° C.

The second prepreg (s) 200 of the composite fabric is positioned closer to the outer layer 11 of the bulletproof helmet 10 than the unidirectional fabric (s) 300 during the molding process. Conversely, the unidirectional fabric (s) 300 of the composite fabric is positioned closer to the inner layer 12 of the bulletproof helmet 10 than the second prepreg (s) 200.

As described above, the composite fabric for a bulletproof helmet of the present invention includes both the fabrics 110 and 210 formed of high-strength fibers and the unidirectional fabric 300 formed of high-strength fibers. Therefore, A synergy effect due to the interaction can be expressed.

In particular, by using the fabric 210 with the second composition 220 applied as a film on one surface as the fabric 210 used with the unidirectional fabric 300, the second composition 220 can be applied to the entire fabric 210 in a uniform amount. Also, the amount of the second composition 220 applied to the fabric 210 is relatively small, which is advantageous in achieving a light weight of the bulletproof product.

However, the outer layer 11 and the inner layer 12 of the bulletproof helmet 10 are formed by the first prepreg 100 containing a polymer resin, that is, the first fabric 100 impregnated with a sufficient amount of the first composition 120, The bulletproof helmet 10 can be improved in colorability, non-hygroscopicity, and bulletproof performance, and the rear surface deformation due to bullet collision can be minimized.

Hereinafter, the present invention will be described in detail through examples and comparative examples. However, the following examples are only intended to help the understanding of the present invention should not be limited to the scope of the present invention.

Example  One

Aramid fiber having a fineness of 1500 denier (Kolon Industries Inc., Hercules Crohn ^®) was prepared in a plain weave aramid fabric by performing, using a warp and weft. The aramid fabric had a surface density of 415 g / m < 2 >. Subsequently, after dipping the aramid fabric into a phenol resin diluted with methanol, the weight ratio of the phenol resin to the aramid fabric was adjusted to 30% through a squeegeeing process using a pressure roller. The first prepreg was then completed by drying the aramid fabric impregnated with phenolic resin through a drying chamber at a rate of 5 m / min at a temperature of 70 ° C.

Then, an aramid fabric was produced by performing plain weaving using aramid fibers having a fineness of 1500 deniers (Herakron < ( ^R ) >, Kolon Industries Co., Ltd.) as warp and weft. The aramid fabric had a surface density of 415 g / m < 2 >. Then, a polymer film having a surface density of 58 g / m < 2 > was produced. The polymer film contained 48 wt% phenolic resin, 48 wt% polyvinyl butyral resin, and 4 wt% plasticizer. The polymer film was then placed on one side of the aramid fabric and dried at a temperature of 45 DEG C for about 3.75 minutes. Subsequently, the 2nd prepreg was completed by pressing at the temperature of 115 degreeC using the heated pressure roller.

Then, first and second fiber layers were prepared by aligning a bundle of aramid fibers having a fineness of 1500 denier (Herakron < ( ^R ) >) on a common plane substantially in one direction and then coating the polyurethane resin. Then, the unidirectional fabric was completed by cross-joining the first and second fiber layers at an angle of about 90 degrees.

Subsequently, the laminate was laminated in the order of one first prepreg, nine second prepregs, eight unidirectional raw materials, and one first prepreg, followed by heat press A composite fabric for a bulletproof helmet was completed by applying a pressure of 6000 psi at a temperature of 150 ° C to the stack.

In the following average speed (V50) and back deformation measurement, the bullets were caused to collide with the first prepreg contacting the second prepreg.

Example  2

The same procedure as in Example 1 was carried out except that one laminate was laminated in this order: a first prepreg, six second prepregs, 14 unidirectional fabrics, and two first prepregs A composite fabric for a bulletproof helmet was produced. In the following average speed (V50) and back deformation measurement, the bullets were caused to collide with the first prepreg contacting the second prepreg.

Example  3

The same procedure as in Example 1 was carried out except that one laminate was laminated in the order of a first prepreg, three second prepregs, 19 unidirectional fabrics, and one first prepreg A composite fabric for a bulletproof helmet was produced. In the following average speed (V50) and back deformation measurement, the bullets were caused to collide with the first prepreg contacting the second prepreg.

Comparative example  One

Twenty four unidirectional fabrics prepared by the same method as in Example 1 were laminated and a pressure of 6000 psi was applied to the stack at a temperature of 150 DEG C using a heat press to complete the composite fabric for a bulletproof helmet.

Comparative example  2

9 sheets of first prepregs and 8 sheets of unidirectional sheets fabricated in the same manner as in Example 1 were stacked in this order and then a pressure of 6000 psi was applied at a temperature of 150 DEG C using a heat press to the laminate To complete the composite fabric for the bulletproof helmet. In the following average speed (V50) and back deformation measurement, the bullets were caused to collide with the first prepreg contacting the second prepreg.

Comparative example  3

14 unidirectional raw materials and six first prepregs prepared in the same manner as in Example 1 were laminated in this order, and then a pressure of 6000 psi was applied at a temperature of 150 DEG C using a heat press to the laminate To complete the composite fabric for the bulletproof helmet. In the following average speed (V50) and back deformation measurement, the bullets were caused to collide with the first prepreg contacting the second prepreg.

Comparative example  4

18 sheets of unidirectional webs and four sheets of the first prepregs were stacked in this order in the same manner as in Example 1, and then a pressure of 6000 psi was applied at a temperature of 150 DEG C using a heat press to the laminate To complete the composite fabric for the bulletproof helmet. In the following average speed (V50) and back deformation measurement, the bullets were caused to collide with the first prepreg.

Comparative example  5

After stacking 14 unidirectional fabrics and 7 second prepregs, which were manufactured in the same manner as in Example 1, in order, the stack was subjected to a pressure of 6000 psi at a temperature of 150 ° C. using a heat press. The composite fabric for bulletproof helmets was completed by adding to. At the following average speed (V50) and backside deformation measurements, the bullets collide with the second prepreg.

The area density, average speed, and back deformation of each of the composite fabrics for the bulletproof helmet manufactured by the above embodiments and comparative examples were measured by the following methods, and the results are shown in Table 1 below.

Cotton density of composite fabric

The area density (g / m ² ) of the first and second prepregs and the unidirectional fabric is measured by the test method specified in ISO 9864: 2007, and then the number of the prepregs or fabrics is multiplied to obtain the area density Respectively.

Average speed ( V50 ) And rear strain measurement

The average speed (㎧) that indirectly indicates the degree of the ballistic performance of the composite fabric is calculated by dividing the speed when fully penetrated using Cal.22 caliber fragment shot (FSP) according to MIL-STD-662F specification and the speed The velocity was measured from the averaged value.

The rear deformation was measured by the maximum diameter (mm) of the protruding portion of the rear side of the composite fabric by the impact at the average speed.

Surface density
(g / m ² ) Average speed (V50)
(m / s) Rear deformation
(mm) Example 1 6900 630 35 Example 2 7100 635 33 Example 3 7000 640 32 Apostasy example 1 7000 610 43 Comparative Example 2 7100 610 41 Comparative Example 3 7100 615 39 Comparative Example 4 7100 620 38 Comparative Example 5 7000 620 41

10: bulletproof helmet
11: outer layer 12: inner layer
13: first intermediate layer 14: second intermediate layer
100: first prepreg 200: second prepreg
300: Unidirectional Fabric
110: first fabric 120: first composition
210: second fabric 220: second composition
310: first fiber layer 320: second fiber layer
330: third fiber layer 340: fourth fiber layer
350: polymer film

Claims (8)

Two first fabrics formed of high strength fibers;
At least one second fabric positioned between the two first fabrics and formed of high strength fibers; And
At least one unidirectional fabric between any one of the first fabrics and the second fabric,
Wherein each of the first fabrics is impregnated with a first composition,
The second fabric is coated with a second composition,
Wherein the unidirectional fabric comprises first and second fiber layers bonded together, wherein each of the first and second fiber layers comprises unidirectionally oriented high strength fibers, the high strength fibers of the first fiber layer And the high-strength fibers of the second fiber layer are arranged in different directions. The method of claim 1,
Wherein the first and second fabrics are formed of ultra high molecular weight polyethylene fibers or aramid fibers,
The aramid fibers have a fineness of 600 to 3000 denier,
Wherein the first and second fabrics have a surface density of 150 to 520 g / m < ² >. The method of claim 2,
Wherein the first composition comprises a urethane resin or a phenolic resin,
Wherein the weight ratio of the first composition to the first fabric is 20 to 38%
Wherein the second composition comprises a phenolic resin, a polyvinyl butyral resin, and a plasticizer,
Wherein the weight ratio of the second composition to the second fabric is 10 to 18%. The method of claim 1,
Wherein the high strength fibers of the first and second fibrous layers are ultra high density polyethylene fibers or aramid fibers. 5. The method of claim 4,
The high strength fibers of the first and second fibrous layers are impregnated or coated with the third composition,
Wherein the third composition comprises a polyurethane resin. The method of claim 1,
The unidirectional fabric further comprises two polymer films,
Wherein the first and second fibrous layers are disposed between the two polymer films. The method according to claim 6,
Wherein the polymer films comprise a polyolefin resin. An outer layer;
An inner layer;
At least one first intermediate layer between the outer layer and the inner layer; And
At least one second intermediate layer between the inner layer and the first intermediate layer,
Wherein each of the outer layer and the inner layer comprises a first fabric of high strength fibers impregnated with a first composition,
Wherein the first intermediate layer comprises a second fabric of high strength fibers coated with a second composition,
Wherein the second intermediate layer comprises first and second fiber layers bonded to each other, wherein each of the first and second fiber layers includes high strength fibers arranged in one direction, and the high strength fibers of the first fiber layer and the second Wherein the high strength fibers of the fibrous layer are arranged in different directions.

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