MX2013012885A - Ballistic panel. - Google Patents

Abstract

The present invention refers to a ballistic panel, said panel being comprised of a plurality of technical fiber fabric layers and elastomer matrix the purpose of which is to be used for protecting against firearm projectiles.

Description

BALLISTIC PANEL The present invention relates to a ballistic panel, said ballistic panel being composed of several layers of staple fiber and elastomer fabric, the purpose of which is to be used to protect against projectiles of firearms.

FIELD OF THE INVENTION The present invention particularly relates to a ballistic panel, which is attached to objects that are to be used as a shield against projectiles of firearms.

BACKGROUND OF THE INVENTION Ballistic panels formed from layers of technical fiber fabric or high strength fiber fabric associated with a polymeric matrix are known to one skilled in the art. Among the most known technical knitted fabrics that provide a high resistance to the impact of firearm bullets, reference can be made to aramid and polyaramide, fiberglass, ceramics, and the like.

More specifically, the polyaramide fiber (aromatic polyaramide or aramid) is remarkable because of its high characteristics performance.

Despite the fact that these panels provide resistance to said impact, they are not flexible at all, and the place reached by the bullet is permanently deformed.

To overcome this disadvantage, a panel composed of several layers of technical fiber fabric covered by a polymeric blanket was developed, thus making the panel strong enough to be used as ballistic protection by absorbing the kinetic energy of a bullet and allowing it to return to its original state after impact, as described in patent application PI0803433-8.

Despite the advantages that this panel presents over the prior art on the date it was presented, it is too heavy, limiting the use thereof, as well as considerably increasing the weight of the object to which it is attached.

In view of this disadvantage, the present invention relates to a ballistic panel made from several layers of aramid fiber fabric, with a specific tenacity wherein said specific fabric is entangled with a layer of polymeric film, or, in a variant, impregnated with a polymeric elastomer composition, thus allowing the use of a reduced number of layers, which provide a lighter panel that is strong enough to be used as ballistic protection by absorbing the kinetic energy of a bullet and allowing it to return to its original state after the impact.

The impregnation of the aramid fabric can be carried out, for example, by spreading on the fabric of a polymeric matrix bath with a ruler in a rake. The material is preferably applied with the help of a ruler on both sides of the fabric, and then vulcanized in a press that applies pressure and temperature. The resulting sandwich, with as many layers of aramid as desired, is applied to the shield, for example, in opaque places of the vehicles.

BRIEF DESCRIPTION OF THE INVENTION The present invention relates to a ballistic panel formed by several layers of technical fiber fabric interlaced with a layer of polymeric film, or, in a constructive variant, the layer of fabric is impregnated with a polymeric matrix that makes the fabric waterproof to water, in addition to the adhesion of the various layers stacked one on top of another and processed at high temperature and pressure.

As used herein, the technical fiber fabric is the ballistic fabric particularly selected from the group consisting of aramid fibers, polyaramide, glass fiber, ceramic fibers, etc. In particular, use is made of the aramid fiber fabric.

The panel is made by adhering 6 to 7 layers of said fabric impregnated with the polymeric matrix, or, in a constructive variant, 6 to 7 layers of technical fiber fabric interlaced with a film layer polymeric The aramid fabric used has a toughness greater than 20 gpd (grams per denier) which at the same time provides good resistance to the impact of projectiles from firearms, and makes it possible to use a reduced number of layers, providing a panel of under weight.

This combination of a polymeric matrix with a technical fiber fabric with a relatively low specific toughness, when compared to the tenacity of the fabrics used at present, has made it possible to use a reduced number of layers, thus producing a high ballistic resistance, as demonstrated by the tests described below.

The polymeric film or impregnation material of the aramid fiber fabric is a polymeric matrix, preferably selected from elastomers, thermoplastic polymers (polyethylene or ethylene vinyl acetate copolymer), resin (phenolic or epoxy), polyurethane, or mixtures thereof. same.

The impregnation can be carried out by any method of the prior art, for example, by diffusing the matrix with the help of a ruler so that the matrix is uniformly distributed on the surface of the fabric. This impregnation is carried out on both sides of the fabric, stacking the layers one on top of the other and transporting them for vulcanization in a press that applies pressure and temperature. The resulting panel is finished to be applied, for example, to the opaque seats of the vehicles.

The panel is manufactured with the help of a press which, in view of the pressure and temperature, promotes the joining of the layers of impregnated fabric, for example, according to the following steps: a) Calibration of the thermocouple (-200 -760 ° C), thermometer (0 to 300 ° C) and manometer (0 to 500 kgf / cm2) of the press; b) Cut according to the selected dimensions of the layers of impregnated technical fiber fabric, or the fabric and the polymeric film; c) Inspection of fabric cleaning conditions; d) Place a stainless steel tray and a material protection layer on the lifting table of a press; e) Place the layers of impregnated fabric over Teflon, or the fabric and the polymeric film; f) Insert an identification tag and cover with a layer of protective material; g) Homogeneous panel pressure at 120 ° C - 190 ° C and more than 10 bar / 223,60 ± 3 kgf / cm2 for about 10 to 60 minutes; h) Regulation of the traction system and removal of the panels; i) Place the panels on a lifting table, to remove the protective material and the finished panels, placing them on platforms; j) Cool the panels.

When the option is to use the aramid fiber fabric impregnated with a polymeric elastomer composition, the manufacturing process of the ballistic panel comprises a previous stage of impregnation of said fabric. The thermocouple calibration (-200 ~ 760 ° C), the thermometer (0 - 300 ° C) and the pressure gauge (0 to 500 kgf / cm2) are checked before placing the layers of impregnated fabric on the press.

Before placing the fabrics in the machine, a visual inspection of the cleaning conditions is carried out, checking that there is no dirt, faults, particles or foreign bodies.

The press is then prepared by placing a stainless steel tray with a layer of protective material on the lifting table, for example, Teflon, and then 6 to 7 layers of impregnated fabric, or the fabric and the polymeric film are placed as alternative, and finally, an identification tag is inserted into the final layer that is covered with a layer of protective material (Teflon).

Therefore, another set of 6 to 7 layers of impregnated fabric, the fabric and the polymeric film, can be placed as an alternative, always entangled with a layer of protective material, such as Teflon, keeping the sets separate from each other . Preferably each module of the press is loaded with a maximum of 6 to 7 panels, thereby providing a homogeneous panel.

Then the layers are pressed at a pressure greater than 10 bar / 223.60 ± 3 kgf / cm2, under a temperature between 120 ° C and 190 ° C, by close 10 to 60 minutes, depending on the number of layers.

The finished panels are then removed from the press to cool, and then a visual inspection is carried out to check that there is no bubble, dirt or bad adhesion between the fabric layers.

The ballistic panel manufactured in this way provides greater resistance to the penetration of projectiles of firearms than those of the state of the art, and the layers adhere completely to each other by covering the fabrics with the polymeric matrix that absorbs the kinetic energy without allowing the 6 to 7 layers to separate. On the other hand, the panels have a lower weight, and in view of the reduction of the number of layers, the weight of the automobile is drastically reduced.

In order to verify the impact resistance, some tests were carried out in the company H.P. White Laboratory, Inc. The tests were carried out in accordance with the provisions of NUJ-STD-0108.01, BULLET RESISTANT PROTECTIVE MATERIALS, dated September 1985, Level IIIA, using .44 Magnum, 240 grains, SWCGC and caliber. 9mm Luger, 124 grains, FMJ ammunition.

The test samples were rigidly fixed at an inside range of 5.03 meters from the mouth of a test cannon to produce zero degree oblique impacts. Speed screens were placed at 1.98 and 2.89 meters, which, together with elapsed time counters (chronographs), were used to calculate the velocities of the projectiles at 2.44 meters from the muzzle. The penetrations were determined by visual examination of a control panel of 2024T3 aluminum alloy of 0.050 centimeters thick positioned 15.24 centimeters behind and parallel to the test samples. Steel plates were attached to the test panels in order to simulate the metal body of the vehicle.

The following samples were presented for the ballistic test: Sample no .: BLAN 606 (9mm) Size: 45.72 x 45.72 centimeters Weight: 2.03 kilograms Thickness: 0.505, 0.436, 0.459, 0.459 centimeters Description: 6 layers of aramid fabric covered with neoprene, in addition to a steel plate Sample no .: BLAN 606 (44MAG) Size: 45.72 x 45.72 centimeters Weight: 2.07 kilograms Thickness: 0.373, 0.447, 0.464, 0.480 centimeters Description: 6 layers of aramid fabric covered with neoprene, in addition to a steel plate Sample no .: BLKN 707 (9mm) Size: 45.72 x 45.72 centimeters Weight: 2.15 kilograms Thickness: 0.462, 0.485, 0.462, 0.508 centimeters Description: 7 layers of aramid fabric coated with Neoprene, plus a steel plate Sample no .: BLKN 707 (44MAG) Size: 45.72 x 45.72 centimeters Weight: 2.03 kilograms Thickness: 0.464, 0.403, 0.500, 0.454 centimeters Description: 7 layers of aramid fabric covered with neoprene, in addition to a steel plate Table I refers to a summary of the results.

Based on the data presented in Table I, the test samples submitted for testing met the ballistic resistance requirements of NIJ-STD-0108.01, MIA Level.

As can be seen in the results of the tests, the present panel provides a total resistance to the penetration of caliber bullets .44 Magnum and 9 mm Luger, when combining the tenacity of its technical fiber fabric used in 6 or 7 layers impregnated with a polymeric matrix, with compression under temperature conditions.

Claims (6)

NOVELTY OF THE INVENTION CLAIMS

1- A ballistic panel composed of several layers of technical fiber fabric impregnated with a polymer matrix or interlaced with a polymeric film, where the tenacity of the technical fiber fabric is greater than 20 gpd, and the polymeric matrix or polymeric film is selected between elastomers, thermoplastic polymers, phenolic resin, epoxy resin, polyurethane, or mixtures thereof.

2. - The ballistic panel according to claim 1, further characterized in that the technical fiber fabric is aramid fiber.

3 - . 3 - The ballistic panel according to claim 1, further characterized in that it is composed of 6 layers of technical fiber fabric.

4. - The ballistic panel according to claim 1, further characterized in that it is composed of 7 layers of technical fiber fabric.

5. - The ballistic panel according to claim 1, further characterized in that it is impregnated with a polymer matrix to provide adhesion between layers.

6. - The ballistic panel according to claim 1, characterized in that it uses pressure and temperature to adhere the layers of technical fiber fabric using the polymer matrix.