JP2003260751A - Far infrared ray camouflaged sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a far infrared ray camouflaged sheet having an excellent camouflage effect to far infrared rays. <P>SOLUTION: The far infrared ray camouflaged sheet is provided by laminating a metallic thin film layer and a camouflaging coloring agent-containing resin layer on at least one surface of the sheet and a thermal radiation rate of the surface is distributed in many ranks. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a far-infrared camouflage sheet that exhibits an excellent camouflage effect against far-infrared rays.

[0002]

2. Description of the Related Art Conventionally, various camouflage materials for visible light and near infrared rays have been proposed as equipment for field battles, which correspond to natural environments such as forests and grasslands. That is, how to minimize the contrast between field equipment and the natural environment.
Infrared photography, which uses infrared rays of 0 to 1400 nm for detection, and methods corresponding to infrared nighttime monitoring methods and the like. For example, Japanese Patent Application Laid-Open No. 2-154084 discloses a method of adding a vat dye to a vinylon woven fabric and performing a camouflage print having three-step infrared reflectance, and Japanese Patent Application Laid-Open No.
Japanese Patent No. 60496 discloses a camouflage-processed fabric having a dye coloring region and a water-insoluble pigment coloring region for each color and imparting a waterproof and moisture-permeable performance, and in Japanese Patent Laid-Open No. 522682/1993, an acidic dye is often used. A camouflage-processed nylon cloth having a camouflage pattern having a graded infrared reflectance has been proposed.

[0003]

However, the camouflage fabrics obtained by these conventional techniques have colors and patterns and near-infrared reflectance that are in harmony with the natural environment such as forests and grasslands, and are visible and near-infrared rays. The camouflage effect was observed in the wavelength region, but the camouflage effect was not observed in the wavelength region of 8 to 14 μm, that is, the far infrared region.

In view of the drawbacks of the prior art, the present invention has been made.
It is intended to provide a far-infrared camouflage sheet having an excellent camouflage effect against far-infrared rays.

[0005]

The present invention adopts the following means in order to solve the above problems. That is, the far-infrared camouflage sheet of the present invention is formed by laminating a metal thin film layer and a camouflage colorant-containing resin layer on at least one side of the sheet, and the thermal emissivity of the surface is distributed in multiple stages. It is characterized by that.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention has been earnestly studied to provide a far-infrared camouflage sheet having an excellent camouflage effect in a natural environment. As a result, a metal thin film layer and a camouflage colorant-containing resin layer are formed on the surface of the sheet. It has been found that such problems can be solved by forming them and distributing the thermal emissivity of the surface thereof in multiple steps within a specific range. The term “multi-stage distribution” as used herein means that a large number of regions having different thermal emissivities are distributed on the surface.

The sheet referred to in the present invention refers to cloth, film, paper and the like, and among these, cloth is particularly preferably used.

The material constituting such a cloth is not particularly limited, but for example, nylon 6, nylon 6.6,
Polyamide fiber made of nylon 12, nylon 4.6, nylon 6 and nylon 6 and 6 copolymer nylon, homopolyester such as polyethylene terephthalate and polybutylene terephthalate, acid component constituting a repeating unit of polyester Represented by polyester fiber made of a copolyester obtained by copolymerizing an aliphatic dicarboxylic acid such as isophthalic acid, 5-sodium sulfoisophthalic acid or adipic acid, polyparaphenylene terephthalamide, polymetaphenylene isophthalamide, etc. Synthetic fibers such as aramid fibers, cellulosic fibers, polyvinyl alcohol fibers, sulfone fibers, ultra high molecular weight polyethylene fibers or natural fibers are used. Preferably synthetic fibers are used.

The fiber may contain various additives which are usually used for improving the productivity or the characteristics in the manufacturing process and the processing process of the raw yarn. For example, a heat stabilizer, an antioxidant, a light stabilizer, a leveling agent, an antistatic agent, a plasticizer, a flame retardant and the like can be contained.

The form of the cloth is not particularly limited, and, for example, a woven fabric, a knitted fabric or a non-woven fabric is appropriately used, and the woven fabric is particularly preferably used. Further, if necessary, a cloth having a mesh structure can be appropriately used.

Further, as such a cloth, one having a limiting oxygen index of 25 or more as measured according to JIS K7201 method is preferably used from the viewpoint of flame retardancy.
Such a cloth can be obtained, for example, by dipping the cloth with a resin containing a phosphorus compound or a bromine compound, heat treatment or coating treatment, or adding the same compound to the raw yarn manufacturing stage.

In the present invention, it is essential that a metal thin film layer and a camouflage colorant-containing resin layer are laminated on at least one side of a sheet. Such metals are gold, silver,
Copper, aluminum, nickel, chromium, iron, zinc, lead and the like and alloys thereof are used, but aluminum is preferably used in terms of performance and lightness.

On the other hand, such a metal thin film layer is laminated on a sheet in a foil shape, but a foil produced by a rolling method may be adhered with an adhesive, but a vapor deposition method, a plating method, a sputtering method. It may be coated on the sheet by a thin film forming method such as. Further, in the vapor deposition method, the metal thin film layer may be once metal-deposited on another sheet, for example, a film, and then the metal thin film layer may be transferred onto a cloth via an adhesive. In addition, when laminating it on a sheet in a foil shape, it may be laminated on the entire surface or may be partially laminated, but the partially laminated one exhibits an excellent camouflage effect. In the case of partially laminating, it is preferable to form 30 to 90% of the area of the sheet.

When the metal thin film layer is formed on the cloth, it is preferable to use a cloth which has been heat calendered or hot pressed in advance to have a flat surface. The thickness of the metal thin film layer is preferably 200 to 1000 angstrom.

The camouflage colorant-containing resin referred to in the present invention imparts camouflage to visible light and near-infrared light, and includes polypropylene resin, vinyl acetate resin, vinyl chloride resin, acrylic resin, urethane resin. Etc. and a synthetic resin containing these modified resins containing a camouflage colorant is used. As the camouflage colorant, a commonly used camouflage pigment or dye can be used. In particular, the pigment may be an inorganic pigment or an organic pigment. For example, as the camouflage colorant, pigments such as light green, dark green, brown, and black corresponding to a shaded portion having a hue and near-infrared reflectance that are in harmony with the natural environment such as trees, grass, and soil can be used. . When the background is an artificial environment such as a building, it is preferable to select a hue corresponding to the environment, for example, a grayish color. The camouflage colorant-containing resin is applied to the surface of the metal thin film layer by a printing method, a coating method, a spray method, a printing method, or the like.

In order to distribute the heat emissivity in multiple stages on the same sheet surface, a method of partially forming a metal thin film layer, a method of changing the coating amount of a resin containing a colorant for camouflage, and a coloring for camouflage. After applying the agent-containing resin, a method of forming an uneven pattern on the surface with an embossing roll is preferably used. Of course, the thermal emissivity may be distributed in multiple stages by appropriately combining these methods.
When forming an uneven pattern, the depth of the uneven portion is preferably 0.05 to 1.00 mm.

On the other hand, it is essential that the thermal emissivity is distributed in multiple stages, and the natural environment, that is, trees, grass,
Although it is basically adjusted to match the thermal emissivity of the soil or the like, it is preferable that the thermal emissivity is distributed in multiple stages in the range of 0.20 to 0.95 in consideration of heat reflection. Further, the difference between the maximum value and the minimum value of the thermal emissivity of the sheet surface is 0.03.
It is preferable that the average thermal emissivity is 0.
It is preferably 35 to 0.70, but by doing so, the camouflage effect can be further exerted against far infrared rays. If the camouflage object generates heat, a heat insulating material that suppresses heat will be used together to further enhance the effect. As such a heat insulating material,
Although not particularly limited, a normal woven fabric, a woven fabric having a knit or mesh shape, a knit, or the like is used.

The far-infrared camouflage sheet is preferably used for applications such as clothes, tents, bags and covers.

Next, the far-infrared camouflage sheet of the present invention will be described with reference to the drawings. First, FIG. 1 is a schematic view showing an example of the structure of the far infrared camouflage sheet of the present invention. In this example, the aluminum vapor deposition thin film layer 3 is formed on the cloth 1 via the adhesive layer 2.
And a colorant-containing resin layer 4 for camouflage. FIG. 2 is a schematic view showing an example of a fabric in which aluminum vapor-deposited thin film layers constituting a far-infrared camouflage sheet are laminated, and the aluminum vapor-deposited thin layer 3 is partially formed on the fabric 1.

[0020]

EXAMPLES The present invention will be described in more detail with reference to examples.

The characteristics in the examples were determined by the following methods. (1) Thermal emissivity 30 cm × 20 cm Test piece is divided into 6 equal parts, and each part is D
and S AERD thermal emissivity meter (made by Devices Servicens). The average thermal emissivity means the average of 6 points. (2) Disguise The camouflage sheet and the normal camouflage sheet were sewn on the poncho, each was worn, and the camouflage characteristic was observed against the background of the forest and judged.

[0022] Difficult to identify ◎ Somewhat difficult to identify ○ There is a camouflage effect △ Easy to identify × A. Visible light region It was visually judged.

B. Photographs were made by near-infrared region infrared photography (a camera equipped with an infrared filter), and the photographs were observed and judged.

C. Far-infrared region detection wavelength of 8 ~ 14μm using an infrared imaging device, 100
It was observed and judged from the distance of m. (3) Oxygen index Measured based on JIS K7201 method.

Example 1 A plain weave having a fineness of 167 decitex and a polyester weight of 30 filaments and a basis weight of 205 g / m ² was scoured and heat set. This plain weave is then sewn at 135 °
5ton single-sided calendering is applied, and on the calendered surface, 500 angstrom aluminum vapor-deposited film vapor-deposited on polyester film is partially (85% area ratio) as shown in Fig. 1 via polyester adhesive.
Transferred to. Then, the aluminum vapor-deposited film surface was coated with a vinyl chloride / vinyl acetate copolymer resin containing 30 parts of a green pigment similar to that of the forest with a doctor knife so that the coating amount was 7.5 g / m ² , and far infrared rays were used. A camouflage sheet was made.

The characteristics of the far-infrared camouflage sheet thus obtained are shown in Table 1. The far-infrared camouflage sheet of the present invention has a thermal emissivity distributed in multiple stages in the range of 0.48 to 0.84, and as a result of observation with a far-infrared imaging device, the image contrast is small, and the background (forest) It was in harmony and difficult to identify.

Comparative Example 1 A basis weight 205 made of the same polyester fiber as in Example 1
A plain weave of g / m ² was scoured and heat set. Then, this plain fabric was subjected to one-side calendering of 25 tons at 135 ° C., and a 500 angstrom aluminum vapor-deposited film vapor-deposited on a polyester film was transferred onto the entire surface of the calendered face via a polyester adhesive. Then, the aluminum vapor-deposited film surface was coated with a vinyl chloride / vinyl acetate copolymer resin containing 30 parts of a green pigment similar to the forest with a doctor knife to a coating amount of 7.5 g / m ² , and far infrared rays were applied. A camouflage sheet was made.

The characteristics of the far-infrared camouflage sheet thus obtained are shown in Table 1. The far-infrared camouflage sheet of Comparative Example 1 has a thermal emissivity of 0.45 at all locations, and as a result of observation with a far-infrared imaging device, the contrast of the image is large, and it cannot be in harmony with the background (forest). , Camouflage was not enough.

Example 2 A basis weight 215 made of the same polyester fiber as in Example 1.
A plain weave of g / m ² was scoured and heat set. Then, this plain fabric was subjected to single-sided calendaring at 20 ° C. at 135 ° C. A non-calender was coated with a urethane resin containing a brominated flame retardant compound, and a 500 angstrom aluminum vapor-deposited film vapor-deposited on a polyester film was partially coated on the calendered surface through a polyester-based adhesive as in Example 1. (Area ratio 85%). After that, a vinyl chloride / vinyl acetate copolymer resin containing 25 parts each of light green, dark green, brown, and black pigments similar to those in the natural environment such as forests and grasslands was used on the aluminum vapor-deposited film surface. A four-color camouflage print was applied so that the coating amount was 5 g / m ² , and a far-infrared camouflage sheet was produced.

The characteristics of the far-infrared camouflage sheet thus obtained are shown in Table 1. The infrared camouflage sheet of the present invention has a thermal emissivity distributed in multiple stages in the range of 0.52 to 0.86, and as a result of observation with a far infrared imaging device, the image contrast was small and it was difficult to identify. . In addition, in the visible light and near-infrared regions, it was in harmony with forests and grasslands and was excellent in camouflage effect.

Comparative Example 2 A fabric weight 215 made of the same polyester fiber as in Example 1
A plain weave of g / m ² was scoured and heat set. Next, a vinyl chloride / vinyl acetate copolymer resin containing 25 parts each of light green, dark green, brown, and black pigments similar to the natural environment of forests, grasslands, etc. was applied, and each was applied at 8.5 g / m ² . Four colors of camouflage prints were applied so as to obtain the amount, and a far-infrared camouflage sheet was produced.

The characteristics of the far-infrared camouflage sheet thus obtained are shown in Table 1. The far-infrared camouflage sheet of Comparative Example 2 has a thermal emissivity in the range of 0.85 to 0.88, and as a result of observation with a far-infrared imaging device, the image contrast is large, and the harmony with the background (forest) is high. I could not get it, and the disguise was not enough.

[0033]

[Table 1]

Example 3 A plain woven fabric having a fineness of 155 decitex and a polyamide fiber having 34 filaments and having a basis weight of 185 g / m ² was scoured and heat set. Next, this plain fabric was dyed at 130 ° C. for 30 minutes using an acid dye having a light green color similar to that of the forest. Then deposited on polyester film 50
A 0 angstrom aluminum vapor deposition film was partially (80% area ratio) transferred as shown in FIG. 2 through a polyester adhesive. After that, vinyl chloride / vinyl acetate copolymer resin containing 25 parts each of dark green, brown, and black pigments similar to the natural environment such as forests and grasslands was used for the aluminum vapor deposition film forming part, each of which was 8.0 g / A three-color camouflage print was applied so that the coating amount was m ² , and a far-infrared camouflage sheet was produced.

The characteristics of the far-infrared camouflage sheet thus obtained are shown in Table 2. The infrared camouflage sheet of the present invention has a thermal emissivity distributed in multiple stages in the range of 0.53 to 0.86, and as a result of observation with a far infrared imaging device, the image contrast was small and it was difficult to identify. . In addition, it was breathable, and in the visible and near-infrared region, it was in harmony with forests and grasslands and was excellent in disguise.

Example 4 185 g of areal weight made of the same polyamide fiber as in Example 3
/ M ² plain weave was scoured and heat set. A 450 angstrom aluminum vapor-deposited film was formed on the entire surface of one side of the plain woven fabric via a polyurethane adhesive. Then, 2 each of light green, dark green, brown, and black pigments similar to the natural environment such as forests and grasslands on the aluminum vapor deposition film surface.
Using a vinyl chloride / vinyl acetate copolymer-based resin contained in 5 parts, four-color camouflage prints were applied so that each had a coating amount of 8.5 g / m ² . Thereafter, embossing of 25 tons was performed at 125 ° C. with an embossing roll having a large number of leaf shapes to produce a far-infrared camouflage sheet.

The characteristics of the far-infrared camouflage sheet thus obtained are shown in Table 2. The infrared camouflage sheet of the present invention has thermal emissivity distributed in multiple stages in the range of 0.63 to 0.85, and as a result of observation with a far infrared image device, the image contrast was small and it was difficult to identify. . In addition, in the visible light and near-infrared regions, it was in harmony with forests and grasslands and was excellent in camouflage effect.

[0038]

[Table 2]

[0039]

According to the present invention, a far-infrared region of 3 to 14 μm has an excellent camouflage effect with respect to a natural environment such as a forest or a grassland, and it is difficult to detect it by visual observation or an infrared imaging device. An infrared camouflage sheet can be provided.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an example of the configuration of a far-infrared camouflage sheet of the present invention.

FIG. 2 is a schematic view showing an example of a state in which the aluminum vapor deposition film layer forming the far infrared camouflage sheet of the present invention is partially formed.

[Explanation of symbols]

1 cloth 2 Adhesive layer 1 Aluminum vapor deposition thin film layer 4 Unexpectedly adopted colorant-containing resin layer

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2C014 JJ01                 4F100 AB01B AB10B AK01A AK01C                       AK15J AK22J AK41 AL01                       AT00A BA03 BA07 BA10A                       BA10C CA13C DG11A DG12A                       EH66 GB90 HB00C HB21C                       JJ10 JL10C JM02B YY00                       YY00A

Claims (15)

[Claims] 1. A metal thin film layer and a camouflage colorant-containing resin layer are laminated on at least one side of a sheet, and
A far-infrared camouflage sheet characterized in that the thermal emissivity of its surface is distributed in multiple stages. 2. The far-infrared camouflage sheet according to claim 1, wherein the thermal emissivity is distributed in multiple stages in the range of 0.20 to 0.95. 3. The far-infrared camouflage sheet according to claim 1, wherein the difference between the maximum value and the minimum value of the thermal emissivity of the sheet is 0.03 or more. 4. The sheet has an average thermal emissivity of 0.35 to 0.35.
It is 0.70, The far-infrared camouflage sheet | seat in any one of Claims 1-3 characterized by the above-mentioned. 5. The far-infrared camouflage sheet according to any one of claims 1 to 4, wherein the camouflage colorant-containing resin layer has a plurality of hues. 6. The metal thin film layer has a thickness of 200 to 1000.
It is Angstrom and is characterized by 1-5.
The far-infrared camouflage sheet according to any one of 1. 7. The far-infrared camouflage sheet according to any one of claims 1 to 6, wherein the metal is aluminum. 8. The far-infrared camouflaged sheet according to claim 1, wherein the metal thin film layer is partially formed on the surface of the sheet. 9. The metal thin film layer has a sheet area of 3
The far-infrared camouflage sheet according to claim 8, wherein the far-infrared camouflage sheet is formed at a ratio of 0 to 90%. 10. The far-infrared camouflage sheet according to any one of claims 1 to 9, wherein the surface of the color-containing resin layer for camouflage has an uneven pattern. 11. The camouflage sheet according to claim 10, wherein the depth of the uneven portion on the surface of the resin layer containing a color for camouflage is 0.05 to 1.00 mm, and the pattern is formed randomly. 12. The far-infrared camouflage sheet according to any one of claims 1 to 11, wherein the sheet is a cloth. 13. The far-infrared camouflage sheet according to claim 12, wherein the cloth is a woven fabric. 14. The far-infrared camouflage sheet according to claim 12, wherein the cloth is composed of synthetic fibers. 15. The far-infrared camouflage sheet according to any one of claims 12 to 14, wherein the cloth has a limiting oxygen index of 25 or more measured according to JIS K7201 method.