The layer of nonwoven material, a layered structure (options), a method of manufacturing a layer of non-woven material

 

(57) Abstract:

The inventive layer of nonwoven material containing polyolefin short fiber with a tensile tensile strength equal to at least 1.2 GPA and a modulus of elasticity of at least 40 GPA, is a felt consisting of at least 80% by volume of polyolefin fibers, and the fibers are essentially located randomly in the plane of the layer and have a length of 40-100 mm, in Another embodiment of the layer is characterized in contrast to the previous implementation only of polyolefin fibers, and the fibers are essentially located randomly in the plane of the layer of convoluted, have a length of 40-100 mm, and have a fineness of 0.5 to 8 denier. Of at least two layers of the above-described first variant constructions are made of a layered structure in which layers are bonded together. Presents another variant of the layered structure, where the layers are made identical to another variant of the execution layer, and the structure contains at least one layer of fabric bonded to one or each layer of nonwoven material. In the invention presented and a method of manufacturing a layer of nonwoven material. 5 C. and 30 C.p. f-crystals, 1 table.

The invention is the procedure of manufacturing the layer of nonwoven material.

Known layer of nonwoven material containing polyolefin short fiber with a tensile tensile strength equal to at least 1.2 GPA and a modulus of elasticity equal to at least 40 GPA. (WO-A-89/01126).

Known layered structure consisting of at least two bonded layers of nonwoven material, each of which contains a short polyolefin fibers with a tensile tensile strength equal to at least 1.2 GPA and a modulus of elasticity of at least 40 GPA. (WO-A-89/01126).

Known layered structure containing at least one layer of nonwoven material, which contains a short polyolefin fibers with a tensile tensile strength equal to at least 1.2 GPA and a modulus of elasticity of at least 40 GPA. (WO-A-89/01126).

A known method of manufacturing a layer of nonwoven material comprising forming a layer of short fibers, applying a layer onto the discharge device providing laying his zigzag folds and subsequent unloading of the received packet layer of partially overlapping each other across the width of the layers, the seal packet layer to reduce its thickness (patent Sveicarijoje typically used in layered ballisticheskih resistant structures.

The disadvantage of a layer of nonwoven material, the layered structure on the basis of this layer, and therefore the drawback of their method of manufacture is that the specific energy absorption (Department for industrial environment), which is the absorption of energy ballistic impact, divided by the surface density (weight divided by the square in m2pretty low. For this reason ballisticheskih resistant layer (structure) should have a bigger weight per m2square to provide reasonable protection against ballistic impacts. Another disadvantage is the presence of a layer basis, which in turn decreases its flexibility and he is not breathing. Because of this ballisticheskih resistant clothing, such as resistant to shrapnel and bullet-proof vests, which applies this layer (structure), is not too comfortable for wearing.

The aim of the present invention is the attempt largely overcome these shortcomings.

One aspect of the invention, this objective is achieved by a layer of non-woven material containing polyolefin short fiber with a tensile tensile strength equal to at least 1.2 GPA and a modulus of elasticity, Rav is 80% by volume of polyolefin fibers, when this fiber, essentially, are located randomly in the plane of the layer and have a length of 40-100 mm

It is advisable that the layer consisted of short polyolefin fibers. Preferably, the fibers had a fineness of 0.5 to 12 denier and were tortuous. It is useful to have specific energy absorption layer of nonwoven material comprised of at least 40 JM2/kg. Preferably, the polyolefin fibers in the layer of nonwoven material consisted of linear polyethylene with the viscosity in decaline at 135oC is equal to at least 5 DL./g, and the ratio of length and width cross-section of the fibers was 2-20. Most preferably, the surface of the fiber was modified by treatment with corona, plasma treatment, chemical functionalization, or by filling fibers.

According to another aspect of the invention, this objective is achieved by a layer of non-woven material containing polyolefin short fiber with a tensile tensile strength equal to at least 1.2 GPA and a modulus of elasticity of at least 40 GPA, which, according to the invention, is felt, consisting of polyolefin fibers, with fibers, essentially, are , the button specific energy absorption layer of nonwoven material comprised of at least 40 JM2/kg. Preferably, the polyolefin fibers in the layer of nonwoven material consisted of linear polyethylene with the viscosity in decaline at 135oC is equal to at least 5 DL/g, and the ratio of length and width cross-section of the fibers was 2-20. Most preferably, the surface of the fiber was modified by treatment with corona, plasma treatment, chemical functionalization, or by filling fibers.

According to another aspect of the invention, this objective is achieved through a layered structure consisting of at least two layers of nonwoven material, each of which contains a short polyolefin fibers with a tensile tensile strength equal to at least 1.2 GPA and a modulus of elasticity of at least 40 GPA, and the layers are bonded together, in which, according to the invention, each layer is a felt containing at least 80% by volume of polyolefin fibers, and the fibers are essentially located randomly in the plane of the layer and have a length of 40-100 mm

It is advisable that each of Slee preferably, to the fibers of each layer were twisted and had a fineness of 0.5 to 8 denier. It is desirable that the specific energy absorption of each layer non-woven fabric comprised of at least 40 j.m2/kg, and polyolefin fibers in each layer of nonwoven material consisted of linear polyethylene with the viscosity in decaline at 135oC is equal to at least 5 DL/g is Useful to the ratio of the length and width of the cross-section of the fibers of each layer was 2-20. Most preferably, the surface of the fibers of each layer was modified by treatment with corona, plasma treatment, chemical functionalization, or by filling fibers.

According to another aspect of the invention, this objective is achieved through a layered structure comprising at least one layer of nonwoven material, which contains a short polyolefin fibers with a tensile tensile strength equal to at least 1.2 GPA and a modulus of elasticity of at least 40 GPA, which according to the invention comprises at least one layer of fabric bonded to one or each layer of nonwoven material, and one or each layer of nonwoven material is Moloko otichno in the plane of the layer and have a length of 40-100 mm

It is advisable that one or each layer of nonwoven material consisted of short polyolefin fibers, and fibers of one or each layer of nonwoven material has a fineness of 0.5 to 12 denier. It is desirable that the fibers of one or each layer of nonwoven material were twisted and had a fineness of 0.5 to 8 denier. It is useful to have specific energy absorption of one or each layer of nonwoven material comprised of at least 40 JM2/kg. Preferably, the polyolefin fibers in one or each layer of nonwoven material consisted of linear polyethylene with the viscosity in decaline at 135oC is equal to at least 5 DL/g, and the ratio of length and width cross-section fibers of one or each layer of nonwoven material was 2-20. Most preferably, the surface fibers of one or each layer of nonwoven material has been modified by treatment with corona, plasma treatment, chemical functionalization, or by filling fibers.

According to another aspect of the invention, this objective is achieved by a method of manufacturing a layer of nonwoven material comprising forming a layer of short fibers, the flow layer on talk of the th packet of the layer of partially overlapping each other across the width of the layers, seal the packet layer to reduce its thickness, which, according to the invention, the layer is formed essentially of the same directed polyolefin fibers with a tensile tensile strength equal to at least 1.2 GPA, a modulus of elasticity of at least 40 GPA and a length of 40-100 mm, and after sealing the batch layer is stretched in the direction of boot and confused stretched layer to get felt.

It is advisable to use twisted fibers with Tonino 0.5 to 8 denier. Preferably, the tangling was carried out by igloprobivnye or hydromotive. It is desirable to condense at least a stretched layer of felt.

The invention will be clear from the subsequent detailed description.

Felt is a layer in which the individual fibers are not going together, forming a specific structure that is similar to the one obtained by knitting and weaving, and this layer is, by definition, does not include base.

Unexpectedly, it was found that this layer has improved specific energy absorption (Department for industrial environment) and therefore very suitable for use in layered ballisticheskih stand structure, particularly for protection against ascollada high, Department for industrial environment. In the application of layered ballisticheskih resistant structures to high values, Department for industrial environment typically include the Department for industrial environment exceeding 35 JM2/kg. Department for industrial environment Is usually determined using standard test Stanag 2920, using mimic fragments of projectiles weighing 1,10,02, the Department for industrial environment layer of nonwoven material, which is the subject of a worthless invention, preferably greater than 40 JM2/kg, and more preferably, more than 50 JM2/kg, and most preferably, more than 60 JM2/kg.

The advantage of a high, Department for industrial environment is that having a certain speed, particles may be delayed by a layer with a lower surface density. Low surface density is very important to improve ease of wearing, which, along with good protection is the primary aim of developing new materials for ballisticheskih counter service.

Another important advantage of the layer of non-woven material for ballisticheskih counter service which is the subject of the present invention is that it has no basis and is therefore more flexible and easier to adapt to the shape of the body, and may, in addition, to breathe, so that you can easily remove vapours produced when sweating.

can be manufactured in a simpler process, which can be implemented by using conventional and used in industry equipment.

Although the mentioned advantages of the invention are clearly discernible above ballisticheskih resistant clothing, such as resistant to shrapnel and bullet-proof vests, the application of the invention is not restricted by them. Other applications are, for example, covers and panels for bombs.

Which is the subject of the present invention, the layer of non-woven material consists essentially of short fibers. The term essentially implies that this layer may include a certain number of other components, excluding the base. Such other components may, for example, be short fibers of a different material. Found that other components have a negative impact on the good results obtained using the present invention. The content of extraneous components preferably should be less than 20%, more preferably less than 10% even more preferably less than 5% and most preferably 0% (volume percent).

Found that the performance of ballistic resistance increases with increasing fineness of the fiber. T is the range of 0.5 to 12 denier. It is difficult to get a felt of fibers Tonino less than 0.5 denier. Felt is made essentially of fibers of tonnoy more than 12 denier, has the worst performance ballistic resistance and lower density. Preferably fineness should be 0.5 to 8 denier, more preferably 0.5 to 5 denier and most preferably 0.5 to 3 denier.

The fibers are preferably twisted. Felt consisting essentially of twisted fibers, has superior mechanical properties and performance of ballistic resistance. Twisted short polyolefin fibers can be obtained from the tortuous polyolefin filaments with a tensile tensile strength equal to at least 1.2 GPA and a modulus of elasticity of at least 40 GPA, by reducing the known methods, for example, by chopping or cutting. The tortuous them can be obtained by any known technique in the way, but preferably with the camera corrugation. Giving tortuosity may not significantly degrade the mechanical characteristics of the fiber, such as ultimate tensile strength and modulus of elasticity.

The most suitable polyolefins are homopolymers and copolymers of polyethylene and polypropylene. In addition, p is con other alkene-1-polymers.

Good results are obtained when the polyolefin is chosen linear polyethylene. Under linear polyethylene is meant polyethylene with less than one branch per 100 carbon atoms, preferably less than one branch per 300 carbon atoms, which may also include up to 5 molar percent of one or more copolymers in addition to alkenes, such as propylene, butylene, Panten, 4-methylpentan and octene.

Preferably the layer of nonwoven material which is the subject of the present invention, use of polyolefin fibers, consisting of a linear polyethylene with a characteristic viscosity in decaline at 135oC, equal to at least 5 DL/g

The length of the fibers should be 40-100 mm In fiber length less than 40 mm cohesion, strength and the Department for industrial environment layer of nonwoven material is too low. When the fiber length is more than 100 mm, Department for industrial environment and the density of the nonwoven layer is much lower. Density is equal to the surface density divided by the layer thickness. In General the layer with higher density more effectively reduce the traumatic impact of a blunt blow. The traumatic impact of a blunt impact is negative bending batona clothing provided low traumatic impact of a blunt blow.

It is also important that the fiber had a high ultimate tensile strength, high modulus and high energy absorption. In the layer of nonwoven material which is the subject of the present invention, applied polyolefin fibers of monofilament having a strength at least equal to 1.2 GPA and a modulus of elasticity equal to at least 40 GPA. When using fibers with lower values of strength and modulus of elasticity is impossible to obtain high performance and ballistic resistance.

Layer, which is the subject of the present invention may include fibers with different cross section, for example, round, rectangular (ribbon) or oval fiber. The cross-sectional shape of the fibers may also, for example, be changed by rolling, the shape of the fiber cross-section is expressed by the ratio of length to width of the cross section. Preferably the ratio of length to width of the cross-section is 2-20, more preferably 4-20. Fibers with a higher value of the ratio of length to width demonstrate a high degree of interaction in the layer of nonwoven material, which results in less ease to move away from anago material.

The degree of interaction can also be changed by modifying the surface of the fibers. Fiber can be modified by including fiber filler. The filler may be an inorganic material, such as gypsum, or polymer. The surface of the fiber may also be modified by kronirovaniye, plasma and/or chemical treatment. Modification may include coarsening of the surface due to the presence of the etching pits, increasing the polarity of the surface and/or chemical functionalization of the surface.

The Department for industrial environment and reducing the traumatic impact of a blunt blow by a layer of non-woven material can be improved by increasing the degree of interaction between the fibers. However, if the interaction is too large, the value of the Department for industrial environment can again be reduced. The optimal value can be determined by the person skilled in the art through a series of conventional experiments.

Good performance ballistic resistance is achieved according to the present invention, provided that the polyolefin fibers described above, is oriented in the plane of the layer of nonwoven material is essentially arbitrary. The expression essentially arbitrarily sledjeski properties in the plane of the layer. Mechanical properties in the plane of the layer is essentially isotropic, i.e., essentially the same in different directions. The difference of mechanical properties in different directions in the plane of the layer of nonwoven material may not exceed 20%, preferably not more than 10% More preferably, the dispersion characteristics of the nonwoven layer was such that the dispersion characteristics of the layered structure, consisting of one or more layers of nonwoven material which is the subject of the present invention was less than 10%

Preferably you should use a polyolefin fiber made from polyolefin filaments produced by the process of extrusion of the gel. Basically, this process involves the preparation of solution of polyolefin with a high characteristic viscosity, determined in decaline at 135oC, the extrusion of the solution into filaments at a temperature higher than the temperature of dissolution, cooling the filaments to a temperature below the temperature of studname to cause stodnevny and removing the solvent before, during or after the stretching of the filaments. Cross-sectional shape of the filaments can be selected by selection of the appropriate form of the aperture for drawing.

The layer of non-woven Eski resistant structures. The layer of nonwoven material which is the subject of the present invention may be used as such in the form of a single layer.

The specific scope of the invention is a layered structure comprising at least two layers of nonwoven material which is the subject of the present invention, bonded together. The advantage of this application lies in the fact that this layered structure is more compact and easier to handle than one layer of nonwoven material.

Another specific application of the invention is a layered structure consisting of one or more layers of nonwoven material which is the subject of the present invention and one or more layers of fabric bonded together. The layer of fabric should preferably also have good ballistic resistance. The layer of fabric preferably consists of polyolefin fibers with a tensile tensile strength equal to at least 1.2 GPA and a modulus of elasticity of at least 40 GPA. The advantage of this layered structure is its high density and that along with elevated, Department for industrial environment it has low property traumatic when topom or stitching.

Layered structure for ballistic protection may consist of one or more layers of nonwoven material, or of the layered structures described above. The number of layers in a layered structure depends on the required level of protection. When used in ballisticheskih resistant clothing the choice of number of layers and, thus, the surface density layered ballisticheskih stand structure is difficult to ensure, on the one hand, the desired level of protection and, on the other hand, need comfort when wearing. Wearing comfort is mainly determined by weight and, thus, the surface density ballisticheskih stand structure. An important advantage of the layer of nonwoven material which is the subject of the present invention is that it is possible to achieve a higher Department for industrial environment with a lower surface density. In this regard, the layer of nonwoven material which is the subject of the present invention, particularly useful when used in ballisticheskih persistent structures with low and medium levels of protection (50 from 450 to 500 m/sec) in connection with a very low weight (low surface density) and hence more comfortable to wear. The advantages of the layer of nonwoven material, aeta nonwoven layers and having a weight below 4 kg/m2or more preferably less than 3 kg/m2or most preferably below 2 kg/m2. The layered structure with high surface density receive preferably by loose laying in the service of a large number of layers with a very small surface density.

Felted layers of non-woven fabric or the layered structure can be combined with layers of a different type that may possess some other specific ballistic properties or other properties. Disadvantages of a combination of layers of a different type are to deterioration, among other properties, the Department for industrial environment and easy wearing. Therefore, preferably the entire structure must consist of layers of non-woven material or referred to layered structures. Preferably, such a layered structure had a thickness of 10-30 mm

The layer of non-woven material may be manufactured in different ways, such as the methods of preparation of the paper, providing for the placement of the water suspension of fibers on a wire sieve with subsequent dehydration. However, preferably the layer of nonwoven material is manufactured by the method including:

forming a layer essentially equally aimed koroshi, equal to at least 40 GPA and a length of 40-100 mm, combing through the loose mass of fibers of which is formed nonwoven webs;

the supply thus obtained nonwoven webs onto the discharge unit moving in a direction perpendicular to that in which it comes to the web, laying his zigzag folds and subsequent unloading of the received packet layer of partially overlapping each other across the width of the layers;

(calendering) seal packet layer to reduce its thickness;

stretch obtained calendered batch layer in the direction of the discharge;

and tangles stretched layer to get felt.

The result should be a layer of nonwoven material in the form of felt with improved ballistic resistance, in particular with a specific energy absorption exceeding 35 JM2/kg, especially more than 40 JM2/kg and possibly more than 50 JM2/kg.

Short polyolefin fibers should preferably be twisted.

Twisted fiber can be obtained by subjecting known themselves to processing techniques for corrugation polyol is of the known and the above-mentioned methods. An example of a known method of shirring is processing threads in the camera corrugation. Thus obtained twisted yarn should then be cut into desired length, 40-100 mm during such cutting is a dense mass of fibers. This mass can untangle (loosen), for example, by mechanical scraping or flushing. In this process, the entangled fibers, which are obtained by using monofilaments, at the same time are divided into essentially separate fibers. The advantage of using the above method, the twisted fibers is that of convoluted fiber easier unravel (razryhlyaya) after cutting and easier are being searched with obtaining fleece-webs.

Searching can be done on a regular carbocycles car. The thickness of the layer of fibers coming in carlocasino machine can be chosen within wide limits: it largely depends on the desired surface density of the nonwoven fabric that you want to get a result. In particular, it is necessary to make allowance for stretching, performed at the last stage of the process in which the surface density will decrease depending on the chosen degree rastjagivanie the STV, moving in the direction perpendicular to that served him fleece-webs. This direction is the direction of discharge. Unloading device can be, for example, conveyor belt, the speed of movement of which relative to the feed speed of the nonwoven fleece - webs is chosen in such a way that laid the batch layer consisted of the desired number of partially mutually overlapping layers.

The orientation of the fibers in the batch layer depends on the ratio of the above-mentioned feed speed and travel speed and the ratio of the width of the fleece-webs and the width of the layer package. Fibers will be oriented essentially in two directions, as determined by the zigzag scheme styling.

Calendering (seal) packet layer may be accomplished using known devices. The thickness of the layer in the course of the process decreases, and the contact between the fibers becomes denser.

Then calendered layer stretch along the length, i.e., in the direction of discharge. This leads to an increase in surface area so that the thickness and, therefore, the surface density of the stretched layer can be somewhat reduced. The degree of stretching is panovits largely arbitrary.

Grip strength and density of the stretched layer increases by strengthening this layer. This strengthening can be done by igloprobivnye layer or hydrocodeine. If igloprobivnye non-woven fabric punch needles with small teeth, pulling fiber through the layers. The density of the needles may vary within 5-50 needles on cm2. Preferably the density of the needles is within 10-20 needles on cm2. In the case of hydrocodeine stretched layer stitched with multiple streams of water under high pressure. The advantage of hydrocodeine before poprobyval is that in this case less damaged fiber. The advantage of igloprobivnye is its technical simplicity.

Further compaction of the felt can be done by additional igloprobivnye or kalenderhane stretched layer and/or felt. The result of the additional igloprobivnye or calendering a layer of felt is that the felt becomes more dense, thereby reducing the traumatic impact of a blunt blow without an unacceptable reduction, Department for industrial environment. Found that strengthening also helps to increase the randomness of the orientation of the fibers and sublethally loose mass of short fibers coming on carlocasino machine in relation to the number of stacked package nonwoven procesov and reduce the thickness in the calendering process, stretching and strengthening. Thick layers of felt can be obtained by increasing the thickness of the layer at the beginning of the process or by a lesser degree of compaction during the above process. The thicker the felt can also be obtained by stacking several layers and subsequent mixing them together, for example, by igloprobivnye. The advantage of a thicker dense felt is that, along with the Department for industrial environment, it can reduce the traumatic impact of a blunt blow, and it is easier to handle than one thick layer of nonwoven material.

Particularly preferred variant of the felt is produced by its connection poprobyval with cloth or other types of layers. These mixed patterns is much thinner and, along with greatly increased resistance to shards, provides low traumatic impact of a blunt blow.

Thus obtained layers of non-woven material or particular implementations described above may be combined in a layered ballistic-resistant structure with layers of a different type, which may contribute to the improvement of some other indicators ballistic resistance or other properties As in the following examples, but is not limited to them. Quantitative indicators mentioned in the examples are defined as follows.

The ultimate tensile strength and modulus are determined using a tensile test on a tensile testing machine Zwick 1484. Threads measure without sviva. Thread clamp in a length of 200 mm clamps for fiber Orientec (250) pressure 8 bar clamp, to prevent slippage of the threads in the clamp. The speed of travel of the clamp is 100 mm/min Under the elastic modulus assumes its initial value. It is determined at a relative elongation of 1% Fineness is determined by weighing the fiber of known length.

The thickness (T) of the layers of felt were measured in a compressed state by applying pressure 5.5 KPa. Surface density (PP) was determined by weighing of the layer with precisely measured area.

The specific energy absorption (Department for industrial environment) is determined according to the test STANAG 2920, in which MOS (shells, modeling fragments) caliber 0,22, hereinafter referred to as broken, from the unyielding steel of a certain shape, weight (1.1 g), hardness and size (according to the USMIL-P-46593), in a certain way shoot ballisticheskih resistant structure. Energy absorption (PE) rastonirovali bullets in ballisticheskih resistant structure equal to 50% of the Specific energy absorption (Department for industrial environment) calculated by dividing the absorption energy (PE) surface density (PP) layer.

Examples 1. Plastic multi-line fiber (Dyneema SK60) with a limit of tensile strength to 2.65 GPA, initial modulus of 90 GPA, Tonini 1 denier on the monofilament and the ratio of the length and width of the fiber cross-section approximately 6 were subjected to the shirring in the chamber of the corrugation. Twisted fiber cut in the fiber length of 60 mm, the Obtained fiber was placed in carlocasino machine layer thickness of 123 g/m2Received combed woven fleece-laid webs zigzag folds on the conveyor belt and the ratio of belt speed and feed rate combed fleece-web coming to the tape at a right angle, is selected in such a way that managed to get a layer with a width of approximately 2 m, consisting of 10 stacked package nonwoven procesov. Batch layer was Kalandarishvili with little pressure on the belt calender, resulting in more dense and thin calendered layer. Calendered layer stretched in length by 38% of the Stretched layer was condensed by poprobyval with the density of the needles 15 PCs/cm2. The surface density of the nonwoven fabric thus obtained amounted to 120 g/m2. 22 this layer of felt, hereinafter referred to as FO, ulo is the thickness 23 mm

Example 2. Felt FO, obtained in accordance with example 1, were subjected to additional igloprobivnye with the density of the needles 15 PCs/cm2in order to seal the felt. 22 this layer of felt laid the package to get ballisticheskih resistant structure, F2, weighing 2.7 kg/m2and a layer thickness of 22 mm

Example 3. Felt FO obtained in accordance with example 1, were subjected to further seal, additional calendering. Then a few of these layers have laid the package to get ballisticheskih stand structure (F3) with surface density of 3.1 kg/m2and a layer thickness of 20 mm

Example 4. Felt with increased weight and density obtained by stacking a package of three layers of felt FO, obtained in accordance with example 1, and the connection between them by igloprobivnye with the density of the needles 15 PCs/cm2. Then a few thus obtained layers were stacked package to get ballisticheskih stand structure (F4) weighing 2.9 kg/m2and a layer thickness of 20 mm

Example 5. Felt was made as described in example 1, except that in this case the strengthening was performed by the streams of water under high pressure. Then a few floor is a density of 2.6 kg/m2and a layer thickness of 20 mm

Example 6. Multiple layers of non-woven felt FO, obtained in accordance with example 1, was indorsed by poprobyval with Dyneema fabric 504, with the aim of obtaining ballistic resistant structures F6, weighing 2.6 kg/m2and a layer thickness of 8 mm Dyneema 504 is a smooth woven fabric 1x1, supplied by DSM, with fiber 400 denier Dyneema SK66, with the number of yarns in the warp and weft by 17 cm and weighing 175 g/m2.

Examples 7 and 8. Felt was made as described in example 1, except that in this case, instead of the fiber length of 60 mm was used fiber length 90 mm Multiple layers thus obtained of felt folded together to get ballisticheskih persistent patterns F7 and F8, weighing 2.7 kg/cm2and 2.6 kg/cm2and a thickness of 3.2 and 4.8 cm, respectively. Structure F7 subjected to additional igloprobivnye and therefore denser and thinner than F8.

Example 9. Made the felt in accordance with the method described in example 1, except that to obtain ballisticheskih stand structure F9 weighing 1.5 kg/ m2and a layer thickness of 10 mm was used fewer MCA 504 laid the package, to get ballisticheskih persistent patterns C1 and C2 weighing 2.9 kg/m2and 4.5 kg/m2respectively.

Comparative experiments 3-7.

Examples 1-5 from table above-mentioned patent application WO-A-89/01126 was taken as comparative examples C3-C7. The values shown in this patent to the specific energy absorption and surface density, based on the weight of the fiber. In order to be able to compare these values with examples of the present invention, the values were normalized to the total surface density and total specific energy absorption by dividing and multiplying the values of PP and the Department for industrial environment, respectively, the share of pulp fibers.

From ballisticheskih resistant structures F1-F8 and C1-C2 described above, the cut samples of size 40x40 cm, which were then subjected to tests to determine the performance of their ballistic resistance by measuring V 50 under test STANAG 2920 described above. Ballisticheskih persistent patterns of comparative examples C3-C7 in the patent application WO-A-8901126 were tested according to the same standard. The table below shows the results.

The comparison of the obtained results shows C, which is the subject of the present invention show higher specific energy absorption than the best ballisticheskih resistant structure from among C1-C7. appropriate to a modern state of the art. Values the Department for industrial environment non-woven cloths F7 and F8, consisting of fibers with a length of 90 mm, lower than the values of non-woven structures F1-F5, consisting of fibers with a length of 60 mm, but comparable or better, and in most cases much better than the hitherto known structures C1-C7. F7 has a lower, Department for industrial environment due to the specific structure and a smaller thickness of the package, However, the Department for industrial environment is significantly higher than that of the majority of the best known ballisticheskih persistent structures of comparative examples C1-C7. I felt F9 when approximately half the value of the surface density higher ballistic resistance than the structure C1. Comparison felt F9 with felts F1-F8 shows that at low surface density is achieved increasingly higher importance, Department for industrial environment.

1. The layer of nonwoven material containing polyolefin short fiber with a tensile tensile strength of at least 1.2 GPA and a modulus of elasticity of at least 40 GPA, characterized in that the layer is a felt, zalokosta layer and have a length of 40 to 100 mm

2. Layer under item 1, characterized in that the layer consists of a short polyolefin fibers.

3. Layer under item 1, characterized in that the fibers have a fineness of 0.5 to 12.0 denier.

4. Layer according to any one of paragraphs.1 to 3, characterized in that the fibers are twisted.

5. Layer according to any one of paragraphs.1 to 4, characterized in that the specific energy absorption layer of nonwoven material is at least 40 j m2/kg.

6. Layer according to any one of paragraphs.1 to 5, characterized in that the polyolefin fibers in the layer of non-woven material composed of linear polyethylene with the viscosity in decaline at 135oWith at least 5 DL./,

7. Layer according to any one of paragraphs.1 to 6, characterized in that the ratio of length and width cross-section of the fibers is 2 to 20.

8. Layer according to any one of paragraphs.1 to 7, characterized in that the surface of the fiber is modified by treatment with corona, plasma treatment, chemical functionalization or by filling fibers.

9. The layer of nonwoven material containing polyolefin short fiber with a tensile tensile strength of at least 1.2 GPA and a modulus of elasticity of at least 40 GPA, characterized in that the layer is a felt consisting of the length 40 of 100 mm and a fineness of 0.5 to 8.0 denier.

10. Layer under item 9, characterized in that the specific energy absorption layer of nonwoven material is at least 40 j m2/kg.

11. Layer under item 9 or 10, characterized in that the polyolefin fibers in the layer of non-woven material composed of linear polyethylene with the viscosity in decaline at 135oWith at least 5 DL./,

12. Layer according to any one of paragraphs.9 to 11, characterized in that the ratio of length and width cross-section of the fibers is 2 to 20.

13. Layer according to any one of paragraphs.9 to 12, characterized in that the surface of the fiber is modified by treatment with corona, plasma treatment, chemical functionalization or by filling fibers.

14. The layered structure consisting of at least two layers of nonwoven material, each of which contains a short polyolefin fibers with a tensile tensile strength of at least 1.2 GPA and a modulus of elasticity of at least 40 GPA, and the layers bonded together, characterized in that each layer is a felt containing at least about 80. polyolefin fibers, and the fibers are essentially located randomly in the plane of the layer and have a length of 40 to 100 mm

16. Structure on p. 14, characterized in that the fibers of each layer have a fineness of 0.5 to 12.0 denier.

17. Structure on p. 14, characterized in that the fibers of each layer of convoluted.

18. Structure according to any one of paragraphs.14, 15 and 17, characterized in that the fibers of each layer have a fineness of 0.5 to 8.0 denier.

19. Structure according to any one of paragraphs.14 to 18, characterized in that the specific energy absorption of each layer of nonwoven material is at least 40 j m2/kg.

20. Structure according to any one of paragraphs.14 to 19, characterized in that the polyolefin fibers in each layer non-woven fabric composed of linear polyethylene with the viscosity in decaline at 135oWith at least 5 DL. /,

21. Structure according to any one of paragraphs.14 to 20, characterized in that the ratio of length and width cross-section of the fibers of each layer is 2 to 20.

22. Structure according to any one of paragraphs.14 to 21, characterized in that the surface of the fibers of each layer are modified by treatment with corona, plasma treatment, chemical functionalization or by filling fibers.

23. Structure containing at least one layer of nonwoven material, which contains a short polymer 40 HPa, characterized in that the structure comprises at least one layer of fabric bonded to one or each layer of nonwoven material, and one or each layer of nonwoven material is a material containing at least about 80. short polyolefin fibers, and the fibers are essentially located randomly in the plane of the layer of non-woven material and have a length of 40 to 100 mm

24. Structure on p. 23, wherein one or each layer of non-woven material consists of short polyolefin fibers.

25. Structure on p. 23, characterized in that the fibers of one or each layer of non-woven material have a fineness of 0.5 to 12.0 denier.

26. Structure on p. 23, characterized in that the fibers of one or each layer of nonwoven material tortuous.

27. Structure according to any one of paragraphs.23, 24 and 26, characterized in that the fibers of one or each layer of non-woven material have a fineness of 0.5 to 8.0 denier.

28. Structure according to any one of paragraphs.23 to 27, characterized in that the specific energy absorption of one or each layer of nonwoven material is at least 40 j m2/kg.

29. Structure according to any one of paragraphs.23 to 28, characterized in that the polyolefin of the oxen decaline at 135oWith at least 5 DL./,

30. Structure according to any one of paragraphs.23 to 29, characterized in that the ratio of length to width of the cross-section of fibers of one or each layer of nonwoven material is 2 to 20.

31. Structure according to any one of paragraphs.23 to 30, characterized in that the surface fibers of one or each layer of nonwoven material modified by treatment with corona, plasma treatment, chemical functionalization or by filling fibers.

32. A method of manufacturing a layer of nonwoven material comprising forming a layer of short fibers, applying a layer onto the discharge device providing laying his zigzag folds and subsequent unloading of the received packet layer of partially overlapping each other across the width of the layers, the seal packet layer to reduce its thickness, wherein the layer is formed essentially of the same directed polyolefin fibers with a tensile tensile strength of at least 1.2 GPA, a modulus of elasticity of at least 40 GPA and a length of 40 to 100 mm, and after sealing the batch layer is stretched in the direction of discharge and confused stretched layer to get felt.

33. With whom or 33, characterized in that the clutter is implemented by igloprobivnye or hydromotive.

35. The method according to any of paragraphs.32 to 34, characterized in that condense at least a stretched layer of felt.

 

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