Patent Grant
8864424
The present invention relates generally to geocontainers employed to abate soil erosion. More specifically, the present invention is related to woven geotextile fabrics which absorb an impact force of a moving object and geocontainers employing such fabrics.
Geotextile containers, also known as geocontainers, e.g., TenCate Geosynthetics North America's Geotube®, are employed to protect shorelines, rebuild beaches, and reclaim land from bodies of water. Typically, geocontainers are filled with sand or other soil and are placed above or within the soil of the land being protected. However, such containers are subject to damage from debris that is carried by these bodies of water.
Often damage to the geocontainers occurs from inclement weather conditions, such as storms which generate heavy wind and/or seas. Damage also occurs from vandalism, boat propellers, and a number of other situations. When the integrity of the geocontainer is compromised or damaged, the geocontainer loses its ability to provide protection from erosion and other property damage. Once an installed geotextile container is punctured, the sand reinforcing the geotextile container flows out, thereby compromising its performance. Moreover, as waves hit the geotextile container, more and more sand escapes, and the geotextile container's height decreases. As a result, soil erosion potential to the shoreline increases. Accordingly, there is a need to protect geocontainers from damage by debris, vandalism, propellers, or any situation in which the integrity of the geocontainer could be compromised. It is to that end that the instant invention is directed.
In accordance with the present invention, a debris shield is described herein which is employed to protect a geotextile container from damage often suffered as a result of high winds, rapid water, projectiles, vandalism and the like. The debris shield has at least two layers. One layer is an abrasion resistant woven fabric, and the other layer is a single-weave three-dimensional fabric having no more than about a 10% compression at a load of at least 20 pounds/inch2.
In another aspect the three-dimensional fabric has no more than about a 10% compression at a load of at least 32 pounds/inch2 and an air flow of at least 700 cubic feet/minute.
Yet, in another aspect the three-dimensional fabric has no more than about a 10% compression at a load of at least 32 pounds/inch2, a water flow between about 20 gallons per minute/foot2 and about 350 gallons per minute/foot2, and an air flow of at least 750 cubic feet/minute.
Still, in another aspect the debris shield has at least two layers. One layer is an abrasion resistant woven fabric and the other layer is a three-dimensional, plain 4-layer tubular weave having an air flow of at least 750 cubic feet/minute. The debris shield has an impact resistance of at least 105 feet/second as measured in accordance with American Society for Testing Materials ASTM International (ASTM) Standards E1886-05 and E1996-12.
Additionally, a protected geocontainer is described herein. The protected geocontainer has a geotextile container for receiving and retaining soil and/or water and the debris shield disclosed herein disposed over at least a portion of the geotextile container.
The protected container is made by positioning a debris shield as disclosed herein over at least a portion of a geotextile container and anchoring the debris shield so that it is secured to the geotextile container. In another aspect, the protected container is made by attaching the debris shield to the geotextile container by binder yarn.
The disclosure below makes reference to the annexed drawings wherein:
Referring to
Debris shield 14 is a composite fabric comprising two independently woven layers. One layer is a protective layer 18 comprising yarns which form an abrasion resistant fabric. For example, protective layer 18 can comprise polypropylene yarns. In addition, such polypropylene yarns can have high ultraviolet light or radiation resistance. The other layer is a three-dimensional layer 16 which provides impact dampening and energy dissipation. The three-dimensional layer 16 comprises a three-dimensional, plain 4-layer tubular weave with multiple yarns in both diameter warp and fill and varying degrees of shrinker force. In one aspect the three-dimensional layer 16 comprises a combination of polypropylene and polyethylene yarns. As illustrated in
In one aspect the debris shield 14 made in accordance with this disclosure has the protective layer 18 of an abrasion resistant woven fabric and the three-dimensional layer formed of a plain 4-layer tubular weave having air flow, e.g., at least 750 cubic feet/minute, and/or water flow characteristics as described below. Such debris shield 14 has an impact resistance of at least 105 feet/second as measured in accordance with ASTM International Standards E1886-05 and E1996-12. Further, such debris shield 14 has an impact resistance of at least 110 feet/second. Still further, debris shield 14 has an impact resistance of at least 115 feet/second. Yet further, debris shield 14 has an impact resistance of at least 120 feet/second. Even further, debris shield 14 has an impact resistance of at least 125 feet/second.
As discussed above, once an installed geotextile container is punctured, the sand reinforcing the container flows out and compromises the container's performance. Moreover, as waves hit the tube, more and more sand escapes. As the contents of the container escape, the container height decreases, thereby increasing erosion potential to the shoreline. The present invention protects the geotextile container 12 from impact of debris carried by water or from severe weather. When debris strikes the debris shield 14, the shield dissipates the energy from the impact. Yet, the debris shield 14 is permeable to allow air, water, and sand to pass through. Further, the debris shield 14 provides additional UV protection as well as abrasion resistance since the geotextile container 12 is covered by the addition of this shroud. Moreover, the method of attachment of the debris shield 14 provides that the shield remains in place on the geotextile container 12 when the container is stressed by impact from debris or weather. To that end, the debris shield 14 can be utilized in other protective applications, for example, to cover windows, doors, any structural feature of a building, automobiles, or any article which is exposed to high winds and projectiles that one may desire to protect. These examples are only illustrative and should not be considered as limiting.
Although heavy weight fabrics, such as conveyor belting, or coated fabrics can be used to initially protect the geotextile container, such systems are not permeable to air, water, or sand. Water can flow behind such impermeable fabrics and separate them from the container via the wave forces at their retreat from land back to the water source. The present invention is designed to dissipate energy from impact and prevent separation of the protective shroud, i.e, the debris shield, from the tube, whereas the above-described alternative only acts as a protective cover.
The protected container 10 can be employed either above or below ground. The phrase “above ground” means that at least a portion of the container is exposed to the atmosphere. There are many more technical properties which can extended service life and durability in an above ground application; for example, ultraviolet light or radiation (“UV”) resistance, impact resistance, and permeability.
The three-dimensional layer encompasses a three-dimensional woven structure designed to protect the geocontainer casing from being cut or torn and to provide a means to dissipate energy due to its compressive resistance.
As illustrated, the woven three-dimensional layer 16 is a single weave fabric comprising shrink and non-shrink yarns. A shrink yarn is a yarn or monofilament which has a pre-determined differential heat shrinkage characteristic that is greater than a yarn or monofilament employed as a non-shrink yarn. Methods of making the illustrated three-dimensional layer 16 are described in U.S. Patent Application Publication No. US 2009/0197021 to Jones et al., which is incorporated herein by reference in its entirety, and United Kingdom Patent No. 853,697 (also referenced as GB 853,697) published Nov. 9, 1960 and issued to United States Rubber Company. The three-dimensional layer 16 comprises:
For example, the three-dimensional layer 16 can be made from at least two types of yarn with different shrink characteristics. One type of yarn can have a relatively high shrink characteristic, such as polyethylene yarns while the other type of yarn can have a relatively low or no shrink characteristic, such as a polypropylene or polyester yarn. In addition, the shrink and non-shrink yarns can be of the same type of polymer, but of differing class with respect to shrinkage. For example, both the shrink and non-shrink yarns can be polyethylene, but one class of the polyethylene has a different shrink characteristic than the other class of polyethylene. The yarns can be woven or otherwise fixed together to from an essentially flat structure. Thereafter, the flat woven structure is heated to shrink the shrink yarn and cause some or all of the yarns to increase in density and form a tubular-shaped fabric.
By heating the shrink yarns, the length of the first and second fabric layer decreases. The length of the third and fourth layer will remain constant, as this layer is made of non-shrink yarns. As a result the extra length has to be compensated. As the third and fourth layer are already zigzagging, the non-shrink yarns curve and as the first and second zigzagging layers are shifted over half a phase, tubular structures are formed. These tubular structures are inherently strong as a result of the shape and can provide the desired shock absorbency. Also the tubular structure provides channels within the fabric, thereby providing drainage.
Typically, yarns employed in the three-dimensional layer 16 have a size between about 500 denier and about 5,000 denier. Non-shrink yarns employed in the three-dimensional layer 16 can have a size in a range between about 8 mils to about 30 mils. Shrink yarns typically have a size in a range between about 150 denier and about 1,800 denier. For example, a 20 mil, round polypropylene yarn can be employed as non-shrink yarn, and 315 denier, round low density polyethylene monofilament can be employed as the shrink yarn. In one aspect polypropylene yarn has a size between about 8 mils and about 30 mils. Low density polyethylene yarn has a size between about 200 denier and about 1,800 denier. The sizes of the yarns employed in the three-dimensional layer can comprise sizes different from those mentioned above. Thus, the sized mentioned should not be considered as limiting.
The three-dimensional layer 16 typically comprises a thickness of about 500 mils. In another aspect the three-dimensional layer 16 has a thickness between about 200 mils and about 1,000 mils. Still, in another aspect the thickness of the three-dimensional layer 16 is between about 150 mils and about 1,200 mils. Yet, in another aspect the thickness of the three-dimensional layer 16 is between about 250 and about 1,000 mils. Further, in another aspect the thickness of the three-dimensional layer 16 is between about 400 mils and about 750 mils. Yet still, in another aspect the thickness of the three-dimensional layer 16 is about 150 mils, about 200 mils, about 250 mils, about 300 mils, about 350 mils, about 400 mils, about 500 mils, about 550 mils, about 600 mils, about 650 mils, about 700 mils, about 750 mils, about 800 mils, about 850 mils, about 900 mils, about 950 mils, about 1,000 mils, about 1,050 mils, about 1,100 mils, about 1,150 mils, about 1,200 mils, or any range therebetween. Thickness is determined in accordance with ASTM International (ASTM) Standard D5199-01 (2006) entitled “Standard Test Method for Measuring the Nominal Thickness of Geo synthetics”.
Typically, the density or weight of the three-dimensional layer 16 is about 18 ounces/yard2 (“osy”). In another aspect the weight of the three-dimensional layer 16 is between about 15 osy and about 22 osy. Still in another aspect the weight of the three-dimensional layer 16 is about 16 osy±5 osy. Yet, in another aspect the weight of the three-dimensional layer 16 is about 15 osy, about 15.5 osy, about 16 osy, about 16.5 osy, about 17 osy, about 17.5 osy, about 18 osy, about 18.5 osy, about 19 osy, about 19.5 osy, about 20 osy, about 20.5 osy, about 21 osy, about 21.5 osy, about 22 osy, about 22.5 osy, about 23 osy, about 23.5 osy, about 24 osy, about 24.5 osy, about 25 osy, or any range therebetween. Weight is determined in accordance with ASTM Standard D5261-10 entitled “Standard Test Method for Measuring Mass per Unit Area of Geotextiles”.
As mentioned above, the three-dimensional layer 16 comprising the debris shield 14 provides shock absorbency. Shock absorbency is expressed herein as a function of the compressibility of the fabric when subjected to a given load. Compressibility is determined in accordance with ASTM Standard D3575-08 entitled “Standard Test Methods for Flexible Cellular Materials Made from Olefin Polymers”. The three-dimensional layer 16 employed in the debris shield 14 has 10% compression at a load of about 32 pounds/inch (“psi”). In another aspect the three-dimensional layer 16 has 25% compression at a load of about 38 psi. Yet, in another aspect the three-dimensional layer 16 has 50% compression at a load of about 45 psi. Still, in another aspect the three-dimensional layer 16 has 10% compression at a load of about 10 psi. Yet still, in another aspect the three-dimensional layer 16 has 10% compression at a load of about 20 psi. Still further, in another aspect the three-dimensional layer 16 has 10% compression at a load of about 20 psi, about 25 psi, about 26 psi, about 27 psi, about 28 psi, about 29 psi, about 30 psi, about 31 psi, about 32 psi, about 33 psi, about 34 psi, about 35 psi, or any range therebetween. Still yet further, in another aspect the three-dimensional layer 16 has 50% compression at a load of about 50 psi, about 60 psi, about 70 psi, about 80 psi, about 90 psi, about 100 psi, about 110 psi, about 120 psi, about 130 psi, about 140 psi, about 150 psi, or any range therebetween.
Typically, the three-dimensional layer 16 has a grab tensile of about 800 pounds warp and about 800 pounds fill as determined in accordance with ASTM Standard D4632-08 entitled “Standard Test Method for Grab Breaking Load and Elongation of Geotextiles”. In another aspect the grab tensile warp is about 700 pounds, about 750 pounds, about 800 pounds, about 850 pounds, or any range therebetween. Still, in another aspect the grab tensile fill is about 700 pounds, about 750 pounds, about 800 pounds, about 850 pounds, or any range therebetween.
As mentioned above, the three-dimensional layer 16 has excellent air flow characteristics. Air flow is determined by ASTM Standard D737-04 (2008)e1 entitled “Standard Test Method for Air Permeability of Textile Fabrics”. Typically, the three-dimensional layer 16 has an air flow of about 1,000 cubic feet/minute (cfm). In another aspect, the three-dimensional layer 16 has an air flow of about 700 cfm, about 750 cfm, about 800 cfm, about 850 cfm, about 900 cfm, about 950 cfm, about 1,000 cfm, about 1,050 cfm, or any range therebetween.
Also mentioned above, the three-dimensional layer 16 has excellent water flow characteristics. Water flow is determined by ASTM Standard D4491-99a(2009) entitled “Standard Test Methods for Water Permeability of Geotextiles by Permittivity”. Typically, the three-dimensional layer 16 has a water flow of about 200 gallons per minute/foot (“gpm/ft2”). In another aspect, the three-dimensional layer 16 has a water flow between about 20 gpm/ft2 and about 350 gpm/ft2. Yet, in another aspect, the three-dimensional layer 16 has a water flow of about 30 gpm/ft2, flow of about 40 gpm/ft2, flow of about 50 gpm/ft2, flow of about 60 gpm/ft2, flow of about 70 gpm/ft2, flow of about 80 gpm/ft2, flow of about 90 gpm/ft2, flow of about 100 gpm/ft2, flow of about 120 gpm/ft2, flow of about 130 gpm/ft2, flow of about 140 gpm/ft2, flow of about 150 gpm/ft2, flow of about 160 gpm/ft2, flow of about 170 gpm/ft2, flow of about 180 gpm/ft2, flow of about 190 gpm/ft2, flow of about 200 gpm/ft2, flow of about 210 gpm/ft2, flow of about 220 gpm/ft2, flow of about 230 gpm/ft2, flow of about 240 gpm/ft2, flow of about 250 gpm/ft2, flow of about 260 gpm/ft2, flow of about 270 gpm/ft2, flow of about 280 gpm/ft2, flow of about 290 gpm/ft2, flow of about 300 gpm/ft2, flow of about 310 gpm/ft2, flow of about 320 gpm/ft2, flow of about 330 gpm/ft2, flow of about 340 gpm/ft2, flow of about 350 gpm/ft2, or any range therebetween.
Protective layer 18 comprises a durable, high abrasion resistant woven fabric. Typically, the protective layer 18 comprises a high abrasion resistant yarn. In one aspect the yarn comprising the protective layer 18 is treated with an UV stabilizer to provide UV resistance. Such stabilizers are known in the art and commercially available. An example of a durable, high abrasion resistant yarn is polypropylene.
Typically, the protective layer 18 has a thickness between about 50 mils and about 250 mils. In another aspect the thickness of the protective layer 18 is at least 80 mils. Yet, in yet another aspect of the present invention, the protective layer 18 has a thickness of about 150 mils. Still, in another aspect the protective layer 18 has a thickness of about 50 mils, about 60 mils, about 70 mils, about 80 mils, about 90 mils, about 100 mils, about 110 mils, about 120 mils, about 130 mils, about 140 mils, about 150 mils, or any range therebetween. Thickness is determined in accordance with ASTM International (ASTM) Standard D5199-01 (2006).
Warp and fill yarns comprising the protective layer 18 can be monofilaments, tape yarns, spun yarns, and/or fibrillated yarns. The range of the size of the yarns employed in either direction are between about 1,000 denier and about 15,000 denier. In another aspect the range of the size of the yarns are between about 500 and about 5000 denier. Yet, in another aspect, the warp yarns are between about 10,000 and about 15,000 denier, and the fill yarns are between about 3,500 denier and about 5000 denier. The yarns can comprise any shape, such as round, oval, rectangular, square, etc.
Also, the protective layer 18 has a density of about 33 osy+/−8 osy. Weight is determined in accordance with ASTM Standard D5261-10.
As known in the art, a woven fabric has two principle directions, one being the warp direction and the other being the weft direction. The weft direction is also referred to as the fill direction. The warp direction is the length wise, or machine direction of the fabric. The fill or weft direction is the direction across the fabric, from edge to edge, or the direction traversing the width of the weaving machine. Thus, the warp and fill directions are generally perpendicular to each other. The set of yarns, threads, or monofilaments running in each direction are referred to as the warp yarns and the fill yarns, respectively.
A woven fabric can be produced with varying densities. This is usually specified in terms of number of the ends per inch in each direction, warp and fill. The higher this value is, the more ends there are per inch and, thus, the fabric density is greater or higher.
The weave pattern of fabric construction is the pattern in which the warp yarns are interlaced with the fill yarns. A woven fabric is characterized by an interlacing of these yarns. There are many variations of weave patterns commonly employed in the textile industry, and those of ordinary skill in the art are familiar with most of the basic patterns. While it is beyond the scope of the present application to include a disclosure of these multitude of weave patterns, the basic plain, twill, satin, weave patterns can be employed with the protective layer 18. However, such patterns are only illustrative, and the invention is not limited to such patterns. It should be understood that those of ordinary skill in the art will readily be able to determine how a given weave pattern could be employed in practicing the present invention in light of the parameters herein disclosed.
Plain weave is characterized by a repeating pattern where each warp yarn is woven over one fill yarn and then woven under the next fill yarn. As mentioned above, spacing between warp and fill yarns of the protective layer 18 is maintained to provide permeability for water, soil, and air as mentioned above.
A twill weave, relative to the plain weave, has fewer interlacings in a given area. The twill is a basic type of weave, and there are a multitude of different twill weaves. A twill weave is named by the number of fill yarns which a single warp yarn goes over and then under. For example, in a 2/2 twill weave, a single warp end weaves over two fill yarns and then under two fill yarns. In a 3/1 twill weave, a single warp end weaves over three fill yarns and then under one fill yarn. For fabrics being constructed from the same type and size of yarn, with the same thread or monofilament densities, a twill weave has fewer interlacings per area than a corresponding plain weave fabric. In one aspect of the present invention, the protective layer 18 is woven in a 4/4 twill weave with three picks per shed.
A satin weave, relative to the twill and plain weaves, has fewer interlacings in a given area. It is another basic type of weave from which a wide array of variations can be produced. A satin weave is named by the number of ends on which the weave pattern repeats. For example, a five harness satin weave repeats on five ends and a single warp yarn floats over four fill yarns and goes under one fill yarn. An eight harness satin weave repeats on eight ends and a single warp yarn floats over seven fill yarns and passes under one fill yarn. For fabrics being constructed from the same type of yarns with the same yarn densities, a satin weave has fewer interlacings than either a corresponding plain or twill weave fabric.
The process for making geotextile fabrics is well known in the art. Thus, the weaving process employed can be performed on any conventional textile handling equipment suitable for producing the fabric of the present invention. Further, any of the aforementioned patterns weaves may be employed as long as the protective layer 18 made therefrom is sufficient to provide the aforementioned cut and tear resistance while maintaining permeability for water, soil, and air. In one aspect the protective layer 18 is woven in a 2/2 twill or plain weave pattern.
The fibers or mono filaments comprising the aforementioned yarns are typically thermoplastic polymers. Additionally, yarns comprising natural fibers can be employed in the present invention. Polymers which may be used to produce the protective layer 18 and the three-dimensional layer 16 of the debris shield 14 include, but are not limited to, polyamides (for example, any of the nylons), polyimides, polyesters (for example, high tenacity polyesters, polyethylene terephthalate, such as mono polyethylene terephthalate, polybutylene terephthalate, and aromatic polyesters, for example, Vectran®), polyacrylonitriles, polyphenylene oxides, fluoropolymers, acrylics, polyolefins (for example, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), high density polyethylene (HDPE), co-polymers of polyethylene, polypropylene, and higher polyolefins), polyphenylene sulfide, polyetherimide, polyetheretherketone, polylactic acid (also known as polylactide), aramids (for example, para-aramids, which include Kevlar®, Technora®, Twaron®, and meta-paramids, for example, Nomex®, and Teijinconex®), aromatic ether ketones, vinalon, and the like, and blends of such polymers which can be formed into microfilaments. The yarns can comprise any shape, such as round, oval, rectangular, square, etc. Further, the yarns can comprise other agents, materials, dyes, plasticizers, etc. which are employed in the textile industry. In one aspect the yarns comprise an ultraviolet radiation resistant additive. It will be understood that any materials capable of producing fibers or microfilaments suitable for use in the instant fabric of the present invention fall within the scope of the present invention and can be determined without departing from the spirit thereof.
Furthermore, the respective yarns employed in the protective layer 18 and the three-dimensional layer 16 comprise at least one additive commonly used in conjunction with the material of the fiber. Such additives include, but are not limited to, plasticizers, processing aids, scavengers, heat stabilizers, antistatic agents, slip agents, dyes, pigments, antioxidants, ultraviolet light (radiation) stabilizers, metal deactivators, antistatic agents, flame retardants, lubricants, biostabilizers, and biocides.
The antioxidants, light stabilizers, and metal deactivators employed, if appropriate or desired, can have a high migration fastness and temperature resistance. Suitable antioxidants, light stabilizers, and metal deactivators include, but are not limited to, 4,4-diarylbutadienes, cinnamic esters, benzotriazoles, hydroxybenzophenones, diphenylcyanoacrylates, oxamides (oxalamides), 2-phenyl-1,3,5-triazines; antioxidants, nickel compounds, sterically hindered amines, metal deactivators, phosphites and phosphonites, hydroxylamines, nitrones, amine oxides, benzofuranones and indolinones, thiosynergists, peroxide scavengers, and basic costabilizers.
Examples of suitable antistatic agents include, but are not limited to, amine derivatives such as N,N-bis(hydroxyalkyl)alkylamines or -alkyleneamines, polyethylene glycol esters and ethers, ethoxylated carboxylic esters and carboxamides, and glycerol monostearates and distearates, and also mixtures thereof.
The additives are used in typical amounts as provided in the respective product literature. For example, the respective additives, when present, are in an amount from about 0.0001% to 10% by weight based upon the total weight of the fiber. In another aspect, the respective additives are present in an amount from about 0.01% to about 1% by weight based on the total weight of the respective fiber.
Referring to
An example of an anchor 22 employed with the present invention is a duckbill anchor, which is illustrated in
Referring to
Stake 27 is conventionally driven into the ground. Once the desired number of stakes 27 are installed, that is, a sufficient number to secure the debris shield 14 to the container 12, the operator connects the debris shield 14 to the stakes 27 by respective support straps 20. In another aspect the stakes 27 are employed to secure the debris shield 14 to the container 12 without straps. This is accomplished by initially puncturing the debris shield 14 and driving the stake into the container 12. As illustrated in
The straps 20 are respectively secured to the anchors 22, either directly or by an anchor line 21 which is secured to the anchor 22 and extends therefrom. Referring again to
Also, the debris shield 14 can be fitted with anchor tubes (not shown) which extend the length of the debris shield 14. Anchor tubes can have a circumference of 2-4 feet, for example, and are filled with sand or soil slurry. The anchor tubes can be directed attached to the debris shield 14 or can lay over the top of a portion of the debris shield which extends outwardly on the ground away from the geotextile container 12. The weight of the filled anchor tube holds or secures the debris shield in place over the geotextile container.
In new construction the debris shield 14 can be secured to the geotextile container 12 by binder yarn 30. Binder yarn 30 is woven though the debris shield 14 and the geotextile container 12 by conventional sewing, thereby securing the debris shield 14 to the container 12 prior to container filling at a location in the field. Thereafter, the protected container is conventionally filed with water and/or soil.
Impact tests were conducted in accordance with ASTM International Standards E1886-05 and E1196-12. The results are reported in Table 1 below. 11 test units consisting of 21 inch×21 inch square bags, having the appearance of a pillow, respectively containing approximately 100 pounds of sand (volume of sand was 1 cubic foot) were tested. Units 5-7 and 10 employed a debris shield made in accordance with the above description.
All three-dimensional layers of the debris shield were a plain 4-layer tubular weave having a thickness of about 625 mils. In the warp direction, non-shrink yarn was 20 mil round polypropylene and the shrink yarn was a 315 denier low density polyethylene round monofilament. Fill yarn was 565 denier round monofilament polypropylene.
All bags employed in the impact test were formed of a woven fabric of 11,000 denier polypropylene fibrillated warp yarns twisted at 1.5 tpi and 4600 denier polypropylene fibrillated fill yarns. The weave was a 2/2 twill, 3 pick per shed having an 11×28 construction and weight of about 25 osy. Each bag had a 2 inch polyvinylchloride port centered on one side to permit filling with sand. During the test, the port was secured from movement and the side thereon was directed away from the missile launcher to avoid affecting the outcome of the impact test. Units 1, 2, and 4 were only the unprotected bags.
Units 3, 8, and 9 were spray coated with a layer of polyurea having a thickness between 30 and 40 mils.
Unit 5 employed a debris shield. The protective layer was fabricated having a 34×18 construction in a 2/2 twill weave with 2 pick insertion covering the impact side of the bag. The warp yarn was a 1360 denier oval-shaped monofilament of polypropylene and the fill yarn was a 4600 denier fibrillated tape polypropylene. The fabric weight was about 17.5 osy. The three-dimensional layer is described above
Unit 6 employed a debris shield. The protective layer was fabricated having a 45×23 construction in a 2/2 twill weave with 3 pick insertion. The warp yarn was a 1360 denier polypropylene, oval-shaped monofilament. The fill yarn was a 4600 denier fibrillated polypropylene yarn. The fabric weight was about 22.5 osy.
Units 7 and 10 employed a debris shield. The protective layer was the same woven fabric as the bag.
Unit 11 employed a woven fabric shroud which covered the bag. The shroud was the same woven fabric as the bag.
The units were strapped to impact stands and impacted at the geometric center with a missile 92 inches in length, 4 inches wide, 2 inches in height, and weighing about 9.25 pounds. The results of the test are provided in Table 1 below. From the result, it can be concluded that the units protected by the debris shield provided enhanced impact resistance over the other units. In addition, the test results show that the debris shield can receive multiple strikes above 115 feet/second at the same location which shows durability.
Therefore, the foregoing is considered as illustrative only of the principles of the invention. Further, various modifications may be made of the invention without departing from the scope thereof and it is desired, therefore, that only such limitations shall be placed thereon as are imposed by the prior art and which are set forth in the appended claims.
This application claims benefit of U.S. Provisional Patent Application Ser. No. 61/306,215 filed Feb. 19, 2010, which is incorporated herein in its entirety by reference.
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| Number | Date | Country | |
|---|---|---|---|
| 20110206458 A1 | Aug 2011 | US |
| Number | Date | Country | |
|---|---|---|---|
| 61306215 | Feb 2010 | US |
