JP2006308258A - Disguised materials and products - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camouflage material having excellent far infrared camouflage property with high durability, and a camouflage product using this camouflage material. <P>SOLUTION: The camouflage material includes fabric (a) containing polyolefinic fiber at 30 wt.% or more to the weight of fabric, and a sheet (b) formed of polyolefinic resin, a metal thin film layer (c) and a back face layer (d) are laminated if necessary. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a camouflage material excellent in durability and far-infrared camouflage, and a camouflaged product using such camouflage material.

  Conventionally, in the field of defense technology, there has been a demand for personal equipment having camouflage performance that cannot be found even when scouted with binoculars, a near infrared imaging device, or the like. In particular, recently, far-infrared detection methods have been adopted, and there is a demand for camouflaged materials that cannot be found by far-infrared detection methods.

  Unlike conventional methods, far-infrared detection methods detect far-infrared rays (generally referred to as heat rays) emitted by detection / reconnaissance objects themselves, and can be detected regardless of daytime or nighttime. . Further, since far infrared rays have a long wavelength, they are hardly affected by fog, smoke, etc., and are said to be extremely preferable means for detecting and reconnaissance of human bodies and military objects.

  Various types of camouflage materials having such far-infrared camouflage have been proposed. For example, a far-infrared disguised material using water-absorbing fibers (see, for example, Patent Document 1), a multilayer disguised sheet in which a metal thin film layer, a fine particle-containing resin layer, and a camouflage colorant-containing resin layer are laminated (see, for example, Patent Document 2) ), A far-infrared disguised material (see, for example, Patent Document 3) in which a metal layer is laminated on the fabric surface and a camouflage print is applied to the metal layer.

  However, in the far-infrared camouflage material using the water-absorbing fiber, the camouflage property while the camouflage material is wet is good, but the clothes made of the camouflage material are heavy and contain moisture, and the activities of the wearer are restricted. There was a problem. Furthermore, there is a problem that far-infrared disguise itself is lost when the contained moisture is dried. Moreover, since the said multilayer camouflage sheet becomes very hard, there existed a problem that a wearer's activity was restrict | limited at the time of wearing, when clothes were sewn using this camouflage sheet. In addition, in the far-infrared camouflage material with the camouflage print on the metal layer, the metal surface and the camouflage print are peeled off when the wearer wears and wipes forward because the camouflage print is applied on the metal surface. There was a problem.

Japanese Patent Application Laid-Open No. 2004-77057 JP 2004-257463 A JP 2004-53039 A

  This invention is made | formed in view of said background, The objective is to provide the camouflage product which uses the camouflage material which was durable and excellent in the far-infrared camouflage property, and such camouflage material.

  As a result of intensive studies to achieve the above-mentioned problems, the present inventors have found that fabrics containing polyolefin fibers have low heat radiation characteristics in the far-infrared region, and will complete the present invention by further intensive studies. It came.

Thus, according to the present invention, there is provided “a camouflaged material comprising a fabric (a) containing 30% by weight or more of a polyolefin-based fiber based on the weight of the fabric”.
At that time, the polyolefin fiber is preferably a polyethylene fiber. Moreover, it is preferable that the camouflage print is given to the surface side of this fabric.

  In the camouflage material of the present invention, it is preferable that a sheet (b) made of a polyolefin resin is laminated on the back side of the fabric (a). The polyolefin resin forming the sheet (b) is preferably polyethylene.

Moreover, it is preferable that the metal thin film layer (c) is laminated | stacked on the back surface side of the said sheet | seat (b). The metal thin film layer (c) is preferably made of aluminum. In that case, it is preferable that the fabric (a) is a mesh fabric having a porosity of 20% or more.
Moreover, it is preferable that the fabric containing 30% by weight or more of aramid fibers is laminated as the back layer (d) on the back side of the metal thin film layer (c).

  In the camouflage material of the present invention, it is preferable that the integrated emissivity of the surface at a wavelength of 8 to 12 μm is 0.6 or less as measured from the surface side.

  Next, according to the present invention, there is provided any camouflaged product selected from the group consisting of clothes, ponchos, bulletproof vests, and vehicle covering sheets, using the camouflage material.

  ADVANTAGE OF THE INVENTION According to this invention, the camouflage product which uses durability and the camouflage material which was excellent in far-infrared camouflage, and such camouflage material is obtained.

Hereinafter, embodiments of the present invention will be described in detail.
The camouflage material of the present invention includes a fabric (a) containing 30% by weight or more of a polyolefin-based fiber with respect to the fabric weight. Here, the fabric (a) needs to contain 30% by weight or more (preferably 50% by weight or more, particularly preferably 100% by weight) of polyolefin fibers. When the content of the polyolefin fiber contained in the fabric (a) is less than 30% by weight, it is not preferable because sufficient far-infrared disguise property cannot be obtained.

  Examples of polyolefin fibers include polyethylene fibers and polypropylene fibers. Among these, polyethylene fibers are particularly preferable because they have particularly low heat radiation characteristics in the far infrared region.

  The fabric (a) may contain synthetic fibers such as polyester, polyamide, polyacrylonitrile and aramid, recycled fibers such as rayon, and natural fibers such as cotton, wool and silk.

  The form of the fibers constituting the fabric (a) is not particularly limited, and may be long fibers (multifilaments) or spun yarns composed of short fibers. However, in order to control the porosity as described later, long fibers ( Multifilament) is preferable. Such long fibers may be subjected to false twisting or air processing such as interlacing or taslan. The single yarn fineness, total fineness, and single yarn number of the fiber are preferably in the range of single yarn fiber fineness of 0.1 to 3.0 dtex, total fineness of 20 to 300 dtex, and single yarn number of 20 to 200 in terms of softness. Further, the cross-sectional shape of the single yarn fiber is not limited, and may be an irregular cross-sectional shape such as a triangular shape, a flat shape, a constricted flat shape, a cross shape, a hexagonal shape, or a hollow shape in addition to a normal circular cross section.

The structure of the fabric (a) is not particularly limited, and may be a woven or knitted fabric having a woven or knitted structure such as a plain structure, a twill structure, an oblique structure, a circular knitting, a warp knitting, or a non-woven fabric. Furthermore, a film may be used. Especially, when laminating | stacking a sheet | seat (b) and a metal thin film layer (c) on a back surface side like the postscript, a mesh-shaped woven / knitted fabric is preferable. As the fabric weight of the fabric (a) is larger, the heat ray from the wearer or the vehicle can be shielded. However, if the fabric weight is too large, the handleability and wearing comfort are lowered, so the range of 30 to 500 g / m ² . Is preferred.

  If a camouflage print is applied on the surface side of the fabric (a) so that the spectral reflectance in the visible light and / or near infrared region approximates natural natural plants, soil, snow, etc., the far infrared disguised It is preferable because not only the property but also the visible and / or near-infrared disguise properties are improved. In this case, it is preferable to use a pigment that does not contain carbon particles. When the carbon particles are contained in the pigment, the thermal emissivity of the fabric (a) is increased and the far-infrared disguise property may be lowered. By blending pigments of the three primary colors that do not contain carbon particles, black, brown, light green, dark green, and other camouflage colors such as forests can be produced.

  The front side is the side located on the outside air side when using clothes and vehicle covering sheets using camouflage, and the back side is the side located on the skin side or the vehicle side.

  As long as the object of the present invention is not impaired, the fabric (a) may have a conventional dyeing process, water absorption process, water repellent process, raising process, and ultraviolet shielding or antistatic agent, antibacterial agent, deodorant. Various processings that impart functions such as agents, insect repellents, phosphorescent agents, and retroreflective agents may be additionally applied.

  The camouflage material of the present invention may be composed of the fabric (a) alone, but in order to shield heat rays from the wearer or the vehicle, a sheet made of a polyolefin resin on the back side of the fabric (a) ( It is preferable that b) is laminated. The polyolefin resin forming the sheet (b) is preferably polyethylene from the viewpoint of disguising far infrared rays. Moreover, it is preferable that this sheet | seat (b) is a film about 1-30 micrometers in thickness.

  In the camouflage material of the present invention, it is preferable that the metal thin film layer (c) is laminated on the back surface side of the sheet (b) because heat rays from a wearer or a vehicle can be more effectively shielded. Examples of the metal forming the metal film layer (c) include aluminum, nickel, and copper. Among these, aluminum having a low emissivity characteristic in the far infrared region is particularly preferable. As a lamination method, a known method may be used, for example, a method of attaching a metal foil produced by a rolling method to the sheet layer (b) by an adhesive or heat fusion, a plating method, a vacuum evaporation method, a sputtering method, or the like. And a method of forming a metal film on the sheet layer (b). Among these, the vapor deposition method is preferable in that the softness of the camouflage material is not impaired.

  Here, when laminating the sheet (b) and the metal thin film layer (c) on the fabric (a), a mesh-like fabric having a porosity of 20% or more (preferably 30 to 60%) is selected as the fabric (a). Is preferred. In general, aluminum has lower thermal radiation characteristics than polyolefin fibers, and therefore, excellent far-infrared disguise property can be obtained through the voids of the fabric (a). In addition, in the space | gap part of a fabric (a), since the metal thin film layer (c) is protected by the sheet | seat (b), the effect that a metal thin film layer (c) cannot peel easily is also exhibited.

Here, the porosity is a tissue porosity, and after preparing a sample of 1 cm × 1 cm, the total area Acm ² of the void formed by the warp and the weft is measured, and the porosity ( %). When the porosity is larger than 60%, the gloss of the metal film layer (c) becomes strong and the visible disguise property may be impaired.
Porosity (%) = A / 1 × 100
In addition, as the woven or knitted structure of the mesh fabric, a tricot knitted fabric or a leno weave is preferable because the porosity can be easily controlled.

  In the camouflage material of the present invention, on the back surface side of the metal film layer (c), when a fabric containing 30% by weight or more (more preferably 70% by weight or more) of aramid fibers is further laminated as a back layer (d), It is preferable because the tear strength, tensile strength, and flame retardancy of the camouflaged material are improved. Examples of such aramid fibers include meta-type aramid fibers and para-type aramid fibers. Of these, meta-aramid fibers are preferred from the viewpoint of flame resistance. Moreover, it is preferable that the back layer (d) contains rayon or cotton that has been subjected to flame retardancy, because flame retardancy is improved.

  The fabric form of the back layer (d) is preferably a woven fabric or a knitted fabric in terms of tearing and tensile strength. Further, the back layer (d) has a conventional dyeing process, water absorption process, water repellent process, brushed process, UV shielding or antistatic agent, antibacterial agent, deodorant, insect repellent, phosphorescent agent, recursive agent. Various processings that impart functions such as a reflective agent may be additionally applied.

  In the camouflage material of the present invention, when the sheet (b), the metal thin film layer (c), and the back surface layer (d) are stacked on the fabric (a), the order of the stacking process is not limited, but the back surface side of the sheet (b) After laminating the metal thin film layer (c) by vapor deposition or the like, the fabric (a) may be bonded to the front side of the sheet (b) and the back layer (d) may be bonded to the back side of the metal thin film layer (c). It is preferable on the process. As a method of bonding, sewing may be used, but a method of heat-sealing or a method of bonding the two using a binder (adhesive) becomes a single piece of fabric, which makes it easy to handle and wear a camouflaged product. It is preferable in terms of its properties and use in various applications. The binder is preferably an olefin-based binder from the viewpoint of adhesive strength.

  In addition, when a camouflage print is applied to the fabric (a), the fabric (a) may be bonded to the sheet layer (b), the metal thin film layer (c), the back layer (d), etc., but before the bonding (a It is preferable in terms of the process to perform a camouflage print.

In the camouflage material of the present invention, since the far-infrared camouflage is exhibited by the polyolefin-based fibers contained in the fabric, there is no problem that the metal surface or camouflage print peels off even if the wearer wears and wipes forward, and the durability is good. Excellent far-infrared camouflage is obtained.
As such far-infrared disguise, it is preferable that the integrated emissivity of the surface at a wavelength of 8 to 12 μm is in the range of 0.6 or less (preferably 0.1 to 0.5) as measured from the surface side.

  The reason why the fabric containing the polyolefin fiber has a low heat radiation characteristic in the far infrared region has not been clarified yet, but it is presumed that there is some relationship with the molecular property of the polyolefin fiber.

  Next, the camouflaged product of the present invention is any camouflaged product selected from the group consisting of clothes, ponchos, bulletproof vests, and vehicle covering sheets, using the camouflage material. Since such a camouflaged product uses the aforementioned camouflage material, it is durable and excellent in far-infrared camouflage, so even if it is worn and exposed to harsh environments, the excellent far-infrared camouflage may be almost reduced. Absent.

Next, although the Example and comparative example of this invention are explained in full detail, this invention is not limited by these. In addition, each measurement item in an Example was measured with the following method.
(1) Emissivity Using a far-infrared spectroradiometer JIR-500Z (manufactured by JEOL Ltd.), the integral emissivity in the wavelength region of 8 to 12 μm was measured.
(2) After cutting a sample with a porosity of 1 cm × 1 cm, the surface of the sample (fabric (a) side surface) is photographed with an optical microscope, and the photograph is used with image analysis software WINROOF (manufactured by Mitani Corporation). The area A (cm ² ) of the portion not covered with the yarn (void portion) was calculated. And the porosity (%) was calculated | required by the following formula.
Porosity (%) = A / 1 × 100
(3) Disguise effect in the far-infrared region The disguise effect in the far-infrared region was evaluated using a far-infrared imaging device “IR-20” (manufactured by Nippon Avionics Co., Ltd.) that detects a far-infrared wavelength of 8 to 12 μm. After the obtained disguise material was sewn into clothes (disguise product), the subject wore the clothes and maintained an upright and resting posture against the background of trees (15 ° C environment, 1 hour). Thereafter, the disguise was evaluated with the far-infrared imaging device at a position 50 m away from the subject. Judgment is made with the naked eye, the contrast between the background and the subject is not recognized at all, ◎ when the identification is not possible, ○ when the contrast is weak and difficult to identify, the contrast is strong, the identification is When possible, it was set as x.

[Example 1]
First, for the fabric (a), a mesh knitted fabric equivalent to 14G was knitted using a 28G tricot knitting machine using multifilaments made of polyethylene having a total fineness of 56 dtex / 48 fil. Next, after refining and relaxing the knitted fabric in a conventional manner, pigments containing no carbon are prepared in three primary colors, and these are mixed together to produce black, brown, dark green, and light green pigments. A camouflage print was applied by the method to obtain fabric (a). In the obtained fabric (a), the porosity was 48% and the basis weight was 48 g / m ² .

  On the other hand, aluminum was deposited on one side of a 30 μm thick polyethylene film (model OP-mat manufactured by Tosero Co., Ltd.) as a sheet layer (b) by a vacuum deposition method, and a metal thin film layer (c) was laminated. It was 0.23 when the emissivity was measured from the surface on which the metal thin film layer (c) is not laminated | stacked about the sheet layer (b) which laminated | stacked the metal thin film layer (c).

In addition, a 2/2 surge fabric was woven using No. 50 twine spun from 38% by weight of meta-type aramid fiber, 4% by weight of para-type aramid fiber, and rayon fiber subjected to flame retardant treatment. Refined and relaxed by the method, a back layer (d) having a basis weight of 260 g / m ² was obtained.

  Subsequently, the fabric (a) was laminated so that the non-printed side surface and the surface of the sheet layer (b) where the metal thin film layer (c) was not laminated were in contact, and heat-sealed by high-temperature and high-pressure treatment. Further, by using a binder (olefin-based adhesive) to bond the back surface layer (d) on the metal thin film layer (c), the fabric (a), the sheet layer (b), the metal thin film are formed from the front surface side. A camouflaged material in which the layer (c) and the back surface layer (d) were arranged was obtained.

  When the emissivity was measured from the surface of the cloth (a) side of the camouflage material, it was 0.37 at the portion colored black, 0.35 at the portion colored brown, 0.47 at the portion colored dark green, The portion colored light green was 0.29. The camouflage was ◎.

[Example 2]
Example 1 was the same as Example 1 except that a multifilament made of polypropylene having a total fineness of 56 dtex / 48 fil was used as the yarn for fabric (a). When the emissivity was measured from the surface of the obtained camouflage fabric (a) side, the emissivity was 0.50 at the portion colored black, 0.49 at the portion colored brown, and 0.00 at the portion colored dark green. 47, 0.42 at the portion colored light green. Moreover, camouflage property was (circle).

[Example 3]
As a fabric (a), a 30 μm-thick polyethylene film (model OP-mat manufactured by Tosero Co., Ltd.) was used to obtain a fake material made of the fabric (a) alone. It was 0.21 when the emissivity was measured about this camouflage material.

[Comparative Example 1]
Example 1 was the same as Example 1 except that a multifilament made of polyethylene terephthalate having a total fineness of 56 dtex / 48 fil was used as the yarn for fabric (a). When the emissivity was measured from the surface of the obtained camouflage fabric (a) side, the emissivity was 0.87 at the portion colored black, 0.83 at the portion colored brown, and 0.8 at the portion colored dark green. 80, 0.78 at the portion colored light green. Moreover, camouflage property was x.

  ADVANTAGE OF THE INVENTION According to this invention, the camouflage material which was durable and excellent in the far-infrared camouflage property, and the camouflage product using such camouflage material are obtained, The industrial value is very large.

Claims (11)

  A camouflage material comprising a fabric (a) containing 30% by weight or more of a polyolefin-based fiber based on the weight of the fabric.   The camouflage material according to claim 1, wherein the polyolefin fiber is a polyethylene fiber.   The camouflage material according to claim 1 or 2, wherein a camouflage print is applied to a surface side of the fabric.   The camouflage material in any one of Claims 1-3 by which the sheet | seat (b) which consists of polyolefin resin is laminated | stacked on the back surface side of the said fabric (a).   The camouflage material of Claim 4 whose polyolefin resin which forms the said sheet | seat (b) is polyethylene.   The camouflage material of Claim 4 or Claim 5 by which a metal thin film layer (c) is laminated | stacked on the back surface side of the said sheet | seat (b).   The camouflage material according to claim 6, wherein the metal thin film layer (c) is made of aluminum.   The camouflage material according to any one of claims 4 to 7, wherein the fabric (a) is a mesh-like fabric having a porosity of 20% or more.   The camouflage material in any one of Claims 6-8 by which the cloth which contains an aramid fiber 30weight% or more as a back surface layer (d) is laminated | stacked on the back surface side of the said metal thin film layer (c).   The counterfeit material according to any one of claims 1 to 9, wherein the integrated emissivity of the surface at a wavelength of 8 to 12 µm is 0.6 or less as measured from the surface side.   A camouflaged product selected from the group consisting of clothes, ponchos, bulletproof vests, and vehicle covering sheets, using the camouflage material according to any one of claims 1 to 10.