JP2009097850A - Camouflage sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camouflage sheet having excellent camouflage performance against visible light, near infrared rays, and far infrared rays, especially the excellent camouflage performance against the far infrared rays. <P>SOLUTION: This camouflage sheet has a metal thin film layer, a resin layer containing a coloring agent and a functional resin layer including a flame resisting resin layer at least on one side of a base material sheet. The thickness of the metal thin film layer is 0.003-0.05 μm, the thickness of the whole functional resin layer is controlled to a range of 1-20 μm, and the average heat emissivity of the camouflage sheet surface is controlled to range from 0.35 to 0.70. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a camouflaged sheet that hides, for example, an aircraft, a ship, a vehicle, and the like.

  Conventionally, a camouflage material having a camouflage effect for searching by visible light, near infrared, far infrared, or radar has been adopted as equipment in the defense field. These camouflage materials are used to make it difficult to identify by reconnaissance devices by covering aircraft, ships, vehicles and the like. In this case, the camouflaged object has an engine part that is a heat source, and depending on the place of use, there is a risk of being involved in a fire. As a conventional camouflaged material imparted with flame retardancy, a material in which a flame retardant is included in a part of a plurality of thick resin layers on the surface of the camouflaged material has been proposed (for example, Patent Document 1). However, there is a problem that high flame retardancy cannot be obtained.

In addition, a camouflage sheet (for example, Patent Document 2) is proposed in which camouflage printing is performed between two or more layers of a flame retardant-containing waterproof resin layer to improve flame retardancy and friction fastness. However, although flame retardancy, fastness, and visible light camouflage are recognized, the fact is that far-infrared camouflage cannot be obtained due to high thermal radiation emitted from a thick resin layer. Furthermore, since the camouflage material is transported or carried every time it is used, it is desired that the camouflage sheet has a high storage property. However, such a thick resin layer impairs the flexibility of the camouflage sheet, and the storage property is inferior. There was also a problem that cracks occurred during storage.
Japanese Patent No. 2999021 JP 2004-132650 A

  In view of the prior art, the present invention is to provide a camouflaged sheet that is excellent in visible light and near infrared camouflage performance without impairing far-infrared camouflage performance and can impart flame retardancy.

The present invention employs the following means in order to solve such problems. That is, the camouflaged sheet of the present invention is a camouflaged sheet having a metal thin film layer and a functional resin layer including a colorant-containing resin layer and a flame retardant resin layer on at least one surface of the base sheet. The thickness of the functional resin layer is controlled in the range of 1 to 20 μm, and the average thermal emissivity of the camouflaged sheet surface is 0.35 to 0 .70.
A preferred embodiment of such a camouflaged sheet is:
(1) The thickness of the resin layer containing the colorant constituting the functional resin layer and the thickness of the flame retardant resin layer are both 0.5 to 10 μm. (2) The colorant is contained. That the resin layer forms a camouflage pattern,
(3) The average thermal emissivity of the camouflaged sheet surface is distributed in multiple stages,
(4) the camouflaged sheet has a conductive resin layer;
(5) The camouflaged sheet satisfies the flame retardant grade 2 or higher defined in JIS A 1322.

  According to the present invention, it is possible to provide a camouflaged sheet that is excellent in visible ray and near infrared camouflage performance without damaging far-infrared camouflage performance, has flame retardancy, and is excellent in radar camouflage and storage properties. it can. Therefore, the camouflaged sheet of the present invention can be suitably used for camouflaging an aircraft, a ship, a vehicle, and the like.

  The present invention, which does not impair the far-infrared camouflage performance, i.e., visible light, near-infrared camouflage, and a camouflage sheet having flame retardancy, intensively studied, the thickness of the entire functional resin layer to be configured After controlling to a specific range, we found out that it is possible to maximize the camouflage effect of the metal thin film layer, and that it can provide an excellent radar camouflage and storage capacity, The present invention has been achieved.

  That is, when the camouflage sheet was examined for camouflage performance with respect to far infrared rays, it was found that the resin layer (functional resin layer) containing the colorant or flame retardant constituting the camouflage sheet emits high heat radiation. Furthermore, it has been found that this thermal radiation reduces the far-infrared disguised effect. Accordingly, the present invention has been made on the present invention by examining means for controlling such a functional resin layer while maintaining its function and balancing it with the far-infrared disguise by the metal thin film layer.

  The base sheet of the present invention refers to a sheet made of a woven fabric, a knitted fabric, a non-woven fabric, or a film. Among these, a woven fabric or a knitted fabric is preferably used.

  Although it does not specifically limit as a raw material which comprises such a textile fabric or a knitted fabric, For example, nylon 6, nylon 6,6, nylon 12, nylon 4,6, copolymer polyamide which copolymerized nylon 6 component and nylon 6/6 component, etc. Copolymer obtained by copolymerization of an aliphatic dicarboxylic acid such as isophthalic acid, 5-sodium sulfoisophthalic acid or adipic acid with the acid component constituting the repeating unit of the polyester fiber, a homopolyester such as polyethylene terephthalate or polybutylene terephthalate, or a polyester repeating unit Polyester fiber made of polymerized polyester, aramid fiber represented by polyparaphenylene terephthalamide, polymetaphenylene isophthalamide, cellulose fiber, polyvinyl alcohol fiber, sulfone fiber, ultra high molecular weight polyester Such as synthetic or natural fibers, such as Ren fibers are used. Preferably, synthetic fibers are used.

  Such fibers may contain various additives usually used for improving the productivity or properties in the production process and processing process of the raw yarn. For example, a heat stabilizer, an antioxidant, a light stabilizer, a smoothing agent, an antistatic agent, a plasticizer, a flame retardant, and the like can be included.

  The metal thin film layer constituting the camouflaged sheet of the present invention exhibits the effect that the camouflaged sheet shields heat radiation emitted from a person or a vehicle and mixes it with the surrounding natural environment. That is, an excellent far-infrared camouflaging effect is imparted to the camouflaged sheet for searching by a far-infrared imaging device such as thermography.

  As the metal forming the metal thin film layer, titanium, stainless steel, nickel, chromium, gold, silver, copper, iron, zinc, aluminum, or an alloy thereof can be used. Among them, at least one selected from titanium, stainless steel, aluminum, nickel, and silver is preferably used in terms of workability and far-infrared disguise.

  Such a metal thin film layer can be formed by a vacuum deposition method, a sputtering method, an ion plating method, or the like. Among these, the sputtering method is preferably employed because it is easy to form a film thickness described later.

  It is important that the thickness of the metal thin film layer is 0.003 to 0.05 μm. That is, when the thickness of the metal thin film layer is 0.003 μm or more, the effect of improving far-infrared disguise can be obtained. On the other hand, by setting it as 0.05 micrometer or less, it can prevent that the softness | flexibility of a camouflaged sheet is inhibited, and can suppress the glossiness peculiar to a metal. In particular, those having a thickness of 0.005 to 0.03 [mu] m are particularly preferably used so that both the far-infrared camouflage and the visible light camouflage by a resin layer containing a colorant described later have high performance.

  At this time, metal thin film layers having different thicknesses may be partially formed. By doing so, the thermal radiation of the camouflaged sheet can be distributed in multiple stages, and the far infrared camouflaging effect can be further improved. Here, “distributed in multiple stages” means that a large number of regions having different thermal radiation are present on the camouflaged sheet surface.

  The metal thin film layer may be formed directly on the base sheet or may be formed on a flame retardant resin layer described later. However, in order to obtain the effect of visible light disguise by a resin layer containing a colorant described later, it is preferably formed in the lower layer portion of the resin layer containing the colorant. At this time, the flame retardant resin layer may be formed between the metal thin film layer and the resin layer containing the colorant.

  The functional resin layer as used in the present invention refers to a resin layer made of a polymer resin such as a resin layer (colorant-containing resin layer, flame retardant resin layer) containing a colorant or a flame retardant as described above. That means. Such a functional resin layer has high thermal radiation as described above, thereby canceling the far-infrared disguise effect of the metal thin film layer.

  The camouflage sheet of the present invention is a material in which the problem of the functional resin layer is controlled by controlling the thickness thereof, thereby controlling the amount of heat radiation, thereby improving the far-infrared camouflage of the metal thin film layer.

  That is, it is important to control the thickness of the functional resin layer in the range of 1 to 20 μm with respect to the far-infrared disguise of a metal thin film layer having a thickness of 0.003 to 0.05 μm. A thickness that deviates from this thickness is not preferable because the far-infrared disguise property of the disguise sheet cannot be balanced with the function of the functional resin. By controlling the entire functional resin layer to such a specific film thickness, it is possible to provide a material excellent in far-infrared disguise while maintaining various functions of the functional resin layer.

  In such a camouflaged sheet, it is important that the average thermal emissivity of the surface is controlled in the range of 0.35 to 0.70. In short, in a specific camouflaged sheet composed of a metal thin film layer having a thickness of 0.003 to 0.05 μm and a functional resin layer having the specific thickness, the average thermal emissivity on the surface of the camouflaged sheet is 0.35 to 0.003. It has been determined that it can be controlled to 70. When the average heat emissivity is less than 0.3, the natural environment (background) is inclined to the low temperature side, and when it exceeds 0.70, the high temperature side is inclined to be insufficiently mixed with the natural environment. This is not preferable because a forged object is easily identified.

  Next, individual resin layers of the functional resin layer will be described below.

  The resin layer containing a colorant as referred to in the present invention (hereinafter also referred to as a colorant-containing resin layer) improves the camouflage performance of the camouflaged sheet with respect to visible light and near infrared rays using the colorant. In order to obtain the camouflage effect for the near-infrared camera, it is preferable to use a colorant whose near-infrared reflectance as the camouflaged sheet is miscible with the surrounding natural environment.

  Examples of the colorant used in the colorant-containing resin layer include pigments and dyes. Among these, inorganic pigments and organic pigments are preferable. Examples of such inorganic pigments include pigments mainly composed of titanium oxide, calcium carbonate, bengara, and the like. Examples of organic pigments include azo pigments, phthalocyanine pigments, selenium pigments, and isoindoline pigments. be able to.

  Examples of the resin that forms such a colorant-containing resin layer include resins such as vinyl, acrylic, urethane, polyamide, polyester, epoxy, alkyd, polystyrene, and fluorine. Among these, urethane-based resins are preferably used in terms of flexibility and adhesion to the metal thin film layer.

  Such a colorant-containing resin layer is obtained by applying a water-based resin, an organic solvent-based resin, or an emulsion containing a colorant on a substrate sheet or the like by a coating method, a print (pigment printing) method, a spray method, a printing method, It can be formed by drying. Among these, a printing method that can easily form a film thickness, particularly a relief printing method, is preferably used.

  The thickness of the colorant-containing resin layer alone is preferably 0.5 to 10 μm. By setting it as 0.5 micrometer or more, it can prevent that the color of the base material sheet or layer under a colorant containing resin layer sees through, and can exhibit the color by coloring. On the other hand, by setting it as 10 micrometers or less, while preventing a softness | flexibility and storage property falling, the fall of the far-infrared camouflage effect by the thermal radiation emitted from a colorant containing resin layer becoming high can be prevented.

  Moreover, it is preferable that a colorant containing resin layer exhibits a camouflage pattern. By doing so, visible light camouflage performance and near infrared camouflage performance can be further improved. The camouflage pattern is a regular or irregular pattern having a plurality of hues in harmony with the natural environment, that is, trees, grass, soil, and the like. The color forming the camouflage pattern can be obtained by selecting a colorant in the colorant-containing resin. Moreover, thermal radiation can be distributed in multiple stages by varying the thickness of the colorant-containing resin layer of each color that exhibits a camouflage pattern.

  The colorant-containing resin layer may be formed on either the lower layer or the upper layer of the flame retardant resin layer described later. However, in order to obtain the visible light disguise effect by the colorant-containing resin layer, it is preferably formed in the upper layer portion of the metal thin film layer.

  Next, high flame retardancy can be imparted to the camouflaged sheet by providing the flame retardant resin layer.

  As the resin for forming such a flame retardant resin layer, phenol resin, epoxy resin, melamine resin, urea resin, unsaturated polyester resin imparted with flame retardancy (for example, mixed with aluminum hydroxide, bromine, inorganic powder, etc.) And thermosetting resins such as alkyd resin and polyurethane, and resins such as thermoplastic resins such as polyethylene, polyvinyl chloride, polystyrene, polypropylene, acrylic, polyamide, and polyester.

  Such a flame retardant resin layer is applied onto a substrate sheet or the like by a coating method such as knife coating, knife over roll coating, reverse roll coating, or printing method such as relief printing, gravure printing, or padding method, and then dried. Can be formed. Among these, the relief printing method in which formation of the film thickness described later is easy is preferable.

  The thickness of the flame retardant resin layer alone is preferably 0.5 to 10 μm. By setting the thickness to 0.5 μm or more, it is possible to improve the flame retardancy. On the other hand, when the thickness is 10 μm or less, not only the far-infrared disguise property but also the flexibility and storage properties are prevented from being lowered, or when there is a metal thin film layer or a colorant-containing resin layer under the flame retardant resin layer. In addition, the performance of each layer is not impaired. Such a flame retardant resin layer may be formed directly on the sheet, may be formed between the metal thin film layer and the colorant-containing resin layer, or may be formed on the outermost layer portion of the camouflaged sheet. In order to obtain the most effective improvement in flame retardancy, it is preferable to form the camouflaged sheet on the outermost layer.

  Moreover, you may add a near-infrared reflection regulator to a colorant containing resin layer and / or a flame-retardant resin layer as needed. From the viewpoint of cost, it is preferable to add a near-infrared reflection modifier to either the colorant-containing resin layer or the flame retardant resin layer. By adding a near-infrared reflection modifier, it becomes easy to assimilate the near-infrared reflectance of the surrounding natural environment, and a high near-infrared camouflaging effect can be imparted to the camouflaged sheet.

  Such near-infrared reflection modifiers refer to near-infrared reflectors and near-infrared absorbers. Although it does not specifically limit as a near-infrared reflector, Titanium oxide, aluminum oxide, zinc aluminate, barium sulfate etc. can be mentioned. Moreover, as a near-infrared absorber, although it does not specifically limit, carbon black, a phthalocyanine type compound, an anthraquinone type compound, etc. can be mentioned.

  Since the amount of near-infrared reflection varies depending on the thickness of the metal thin film layer or the type of metal, the amount of the near-infrared reflection modifier added to the colorant-containing resin layer and / or the flame-retardant resin layer is According to thickness or the kind of metal, it is good to adjust suitably so that it may assimilate to the near-infrared reflectance which the surrounding natural environment has.

  Moreover, when adding a near-infrared reflection adjusting agent to a colorant containing resin layer, the near-infrared reflectance of this camouflaged sheet can be distributed in multiple stages by varying the addition amount for each color.

  The camouflaged sheet of the present invention preferably further has a conductive resin layer. Such a conductive resin is a resin containing a conductive material such as an electron conductive filler, and by forming a conductive resin layer, it is effective to approximate the reflection characteristic with respect to the radar wave to the reflection characteristic of the surrounding natural environment. Can be obtained. That is, the radar camouflage can be improved.

  Examples of the electron conductive filler include carbonaceous particles such as carbon black, graphite, and carbon nanotubes, carbon fibers, metal powders such as silver and nickel, and conductive metal oxides such as tin oxide, titanium oxide, and zinc oxide. Or a conductive metal oxide wet-coated with insulating particles such as barium sulfate as a core, conductive metal carbide, conductive metal nitride, and conductive metal boride. Can be mentioned. Moreover, an electron conductive filler may be used individually by 1 type, and may be used in combination of multiple types.

  Examples of the resin forming the conductive resin include vinyl resins, acrylic resins, urethane resins, polyamide resins, polyester resins, epoxy resins, alkyd resins, polystyrene resins, fluorine resins, and the like.

  The conductive resin layer can be formed by applying a resin liquid mixed with a conductive material to a sheet by a coating method, a dipping method, a printing (pigment printing) method, a spraying method, a printing method, and the like, and then drying. Among these, the relief printing method and the intaglio printing method are preferable because they are flexible and easy to store and the film thickness described later can be easily formed.

  The conductive resin layer may be formed directly on the base sheet, or may be formed between the metal thin film layer and the functional resin layer, or between or on the functional resin layer. However, when not forming directly on a base material sheet, it must be the thickness and color which do not inhibit the performance of each resin layer. In particular, when forming on the upper part of the metal thin film layer, the combined thickness of the conductive resin layer and the functional resin layer is 1 to 20 μm so that the average thermal emissivity of the camouflaged sheet does not deviate from 0.35 to 0.70. There must be. In order to obtain the effect of improving the performance of each layer, it is preferably formed directly on the base sheet.

  It is preferable that the camouflaged sheet of the present invention satisfies a flameproof grade 2 or higher as defined in JIS A 1322. By satisfying the standard, in the event of use, even if a flame is ignited in the camouflaged sheet, the flame is immediately extinguished and the spread of the flame can be prevented. In order to achieve such flame retardancy, a flame retardant resin layer having a thickness of 0.5 to 10 μm may be formed using a flame retardant resin as described above.

[Measuring method]
(1) Thermal emissivity of camouflaged sheet Samples of 10 cm x 10 cm were taken from each color part forming the camouflage pattern of the sample, and the thermal emissivity was measured with a Dand S AERD thermal emissivity meter (manufactured by Devices Services). The average was obtained.

(2) Far-infrared camouflage of camouflaged sheet An image apparatus is developed from a distance of 150 m using an infrared imaging apparatus having a detection wavelength of 8 to 14 μm against a forest with a sample sewn in a size of 7 m × 10 m on a light truck. The camouflage was confirmed from the contrast displayed on the screen. The case where it was difficult to recognize the shape when mixed with the forest was judged as ◯, the case where it was mixed with the forest but the shape could be discriminated a little, and the case where the shape could be recognized without mixing with the forest was judged as ×.

(3) Visible light camouflage of camouflaged sheet A sample sewn in a size of 7 m × 10 m was spread on a light truck, and camouflage was confirmed from a distance of 150 m visually with a forest in the background. The case where it was difficult to recognize the shape by mixing with the forest was judged as ◯, the case where it was mixed with the forest but the shape could be discriminated a little, and the case where the shape could be recognized without mixing with the forest was judged as ×.

(4) Near-infrared camouflage of camouflaged sheet An image device is developed from a distance of 150 m using an infrared imaging device having a detection wavelength of 800 to 1200 μm against a forest with a sample sewn in a size of 7 m × 10 m on a light truck. The camouflage was confirmed from the contrast displayed on the screen. The case where it was difficult to recognize the shape when mixed with the forest was judged as ◯, the case where it was mixed with the forest but the shape could be discriminated a little, and the case where the shape could be recognized without mixing with the forest was judged as ×.

(5) Flame retardancy of camouflaged sheet Measured according to JIS A 1322: 1966.
(Test specimen)
The shape of the test body was about 30 × 20 cm.
Method A was used for pretreatment of the test specimen. The test specimen in an air-dried state was dried at 50 ± 2 ° C. for 48 hours, and then left in a desiccator containing silica gel for drying for 24 hours and then heated. A test was conducted.
(Heating test equipment)
The heating test was carried out in a container using a heating test apparatus according to this rule.
As the burner used for the heating test, a Meckel burner having a height of 160 mm and an inner diameter of 20 mm was used, and only gas was fed without mixing primary air.
As the fuel used for the heating test, liquefied petroleum gas No. 5 defined in JIS K 2240 was used.
(Heating test)
A burner was placed at a predetermined position of the heating test apparatus, and the length of the flame was adjusted to 65 mm with no support frame attached.
The test body was attached to the heating test apparatus so as not to sag and to be held between support frames according to this rule.
A sensitive coil was used to ignite the burner, and the fuel cock was closed at the end of heating.
The heating time was 10 seconds.
As a measurement item, the after flame was measured for the time that the specimen continued to burn with flames from the end of heating.
As a measurement item, the residual dust was determined by observation of a state of flameless combustion 1 minute after the end of heating.
As a measurement item, the carbonization length was determined by measuring the maximum length in the longitudinal direction of the support frame for the carbonized portion of the heating surface of the test specimen.
The number of tests was three times, and for each of the above measurement items, the maximum value among the three times was adopted, and the flame retardancy was classified according to the following criteria.
Flameproof grade 1: The carbonization length was 5 cm or less, there was no afterflame (approximately 1 second or less), and no residual dust was present after 1 minute.
Flameproof grade 2: Carbonization length was 10 cm or less, afterflame was 5 seconds or less, and no residual dust was present after 1 minute.
Flameproof third grade: Carbonization length was 15 cm or less, afterflame was 5 seconds or less, and no residual dust was present after 1 minute.

(6) Storage property of camouflaged sheet The thickness (cm) of the highest part was measured in a state in which a sample having a size of 80 cm × 80 cm was folded in the vertical direction and further folded in the horizontal direction.

(7) Radar disguise of camouflaged sheet A sample with a size of 1 m × 1 m was checked for camouflage with a radar wave measuring device (manufactured by Agilent Technologies) having a frequency of 9.8 GHz. The case where it was mixed with the surrounding vegetation was marked with ○, and the case where it was not mixed was marked with ×.

[Example 1]
(Substrate sheet)
Using a polyethylene terephthalate (PET) fiber having a total fineness of 110 dtex and 12 filaments, a mesh knitted fabric having a mesh structure composed of a front structure and a back structure was obtained with a tricot knitting machine.
The obtained mesh knitted fabric was refined by a conventional method and heat-set at 190 ° C.
This mesh knitted fabric was used as a base sheet.

(staining)
The substrate sheet was dyed with a light green disperse dye in a liquid dyeing machine.

(Metal thin film layer)
Sputtering of titanium was performed on both surfaces of the substrate sheet in an argon atmosphere to form a metal thin film layer having a thickness of 0.01 μm on one surface of the substrate sheet.

(Colorant-containing resin layer)
A colorant-containing resin obtained by mixing a light green pigment, a dark green pigment, and a brown pigment with a water-based acrylic resin on each side of the base sheet, and the thickness of the light green pigment-containing resin layer is 2 per side of the base sheet. .1 μm, dark green and brown pigment-containing resin layer was applied by a letterpress printing machine (flexographic printing) so that the thickness of each side of the base sheet was 4.3 μm to form a colorant-containing resin layer .

(Flame retardant resin layer)
A relief printing machine (a relief printing press) having a flame retardant resin made of a urethane resin containing 15% by mass of a bromo flame retardant on both sides of the base sheet so that the thickness is 2.5 μm per side of the base sheet. Flexographic printing) to form a flame retardant resin layer, the thickness of one side of the metal thin film layer is 0.01 μm on both sides of the base sheet, and the thickness of one side of the functional resin layer is 4.6 and 6.8 μm This is a camouflaged sheet.

  The obtained camouflaged sheet had an average thermal emissivity of 0.58 and was observed with a far-infrared imaging device. As a result, the camouflaged sheet was mixed with the surroundings and was excellent in camouflage. Visible light and near-infrared camouflage were also excellent because they were mixed with the surroundings. The flame retardancy was first grade (carbonization length: 3.0 cm, after flame: 0 seconds, residue: 0 seconds) and was excellent. In addition, the storage was excellent.

[Example 2]
(Substrate sheet)
The same one as used in Example 1 was used.

(staining)
The base sheet was dyed with a light green disperse dye in the same manner as in Example 1.

(Metal thin film layer)
In the same manner as in Example 1, a metal thin film layer made of titanium having a thickness of 0.004 μm was formed on both surfaces of the substrate sheet.

(Colorant-containing resin layer)
The thickness of the light green pigment-containing resin layer is 2.1 μm on one side of the substrate sheet and the thickness of the dark green and brown pigment-containing resin layers is the substrate on both surfaces of the substrate sheet in the same manner as in Example 1. A colorant-containing resin layer of 4.5 μm was formed on each side of the sheet.

(Flame retardant resin layer)
In the same manner as in Example 1, a flame retardant resin layer having a thickness of 2.4 μm per side of the base sheet was formed on both sides of the base sheet, and the thickness of one side of the metal thin film layer was formed on both sides of the base sheet. Was a camouflaged sheet having a functional resin layer thickness of 4.5 and 6.9 μm.

  The obtained camouflaged sheet had an average thermal emissivity of 0.69, which was slightly higher than that of Example 1, but was excellent in camouflage. Visible light and near-infrared disguise were mixed with the surroundings and excellent. The flame retardancy was first grade (carbonization length: 3.0 cm, after flame: 0 seconds, residue: 0 seconds) and was excellent. The stowability was excellent.

[Example 3]
(Substrate sheet)
The same one as used in Example 1 was used.

(staining)
The base sheet was dyed with a light green disperse dye in the same manner as in Example 1.

(Metal thin film layer)
In the same manner as in Example 1, metal thin film layers made of titanium having a thickness of 0.04 μm per side of the base sheet were formed on both sides of the base sheet.

(Colorant-containing resin layer)
On both sides of the base sheet, in the same manner as in Example 1, the thickness of the light green pigment-containing resin layer is 2.0 μm per side of the base sheet, and the thickness of the dark green and brown pigment-containing resin layers is the base. A colorant-containing resin layer of 4.5 μm was formed on each side of the sheet.

(Flame retardant resin layer)
In the same manner as in Example 1, a flame retardant resin layer having a thickness of 2.3 μm per side of the base sheet was formed on both sides of the base sheet, and the thickness of one side of the metal thin film layer was formed on both sides of the base sheet. Was a camouflaged sheet having a functional resin layer thickness of 4.3 and 6.8 μm.

  The obtained camouflaged sheet had an average thermal emissivity of 0.38 and was slightly lower than that of Example 1, but the camouflage was excellent. As for visible light disguise, the metal luster was somewhat, but it was mixed with the surroundings. As for near-infrared camouflage, the near-infrared reflectance was slightly low, but it was mixed with the surroundings. The flame retardancy was first grade (carbonization length: 3.2 cm, after flame: 0 second, residual dust: 0 second) and was excellent. In addition, the storage was excellent.

[Example 4]
(Substrate sheet)
The same one as used in Example 1 was used.

(staining)
The base sheet was dyed with a light green disperse dye in the same manner as in Example 1.

(Metal thin film layer)
A metal thin film layer made of titanium having a thickness of 0.01 μm was formed on one side of the base sheet in the same manner as in Example 1.

(Colorant-containing resin layer)
On both sides of the base sheet, in the same manner as in Example 1, the thickness of the light green pigment-containing resin layer is 0.6 μm per side of the base sheet, and the thickness of the dark green and brown pigment-containing resin layers is the base. A colorant-containing resin layer having a thickness of 1.3 μm was formed on each side of the sheet.

(Flame retardant resin layer)
In the same manner as in Example 1, a flame retardant resin layer having a thickness of 0.6 μm per side of the base sheet was formed on both sides of the base sheet, and the thickness of one side of the metal thin film layer was formed on both sides of the base sheet. Was a camouflaged sheet having a functional resin layer thickness of 1.2 and 1.9 μm.

  The obtained camouflaged sheet had an average thermal emissivity of 0.42, which was slightly lower than that of Example 1, but was excellent in camouflage. As for visible light disguise, the metal luster was somewhat, but it was mixed with the surroundings. As for near-infrared camouflage, the near-infrared reflectance was slightly low, but it was mixed with the surroundings. The flame retardancy was first grade (carbonization length: 2.9 cm, residual flame: 0 seconds, residual dust: 0 seconds) and was excellent. In addition, the storage was excellent.

[Example 5]
(Substrate sheet)
The same one as used in Example 1 was used.

(staining)
The base sheet was dyed with a light green disperse dye in the same manner as in Example 1.

(Metal thin film layer)
A metal thin film layer made of titanium having a thickness of 0.01 μm was formed on one side of the base sheet in the same manner as in Example 1.

(Colorant-containing resin layer)
The thickness of the light green pigment-containing resin layer is 4.5 μm on one side of the base sheet, and the thickness of the dark green and brown pigment-containing resin layers is the base material on both sides of the base sheet in the same manner as in Example 1. A 9.4 μm colorant-containing resin layer was formed on each side of the sheet.

(Flame retardant resin layer)
In the same manner as in Example 1, a flame-retardant resin layer having a thickness of 9.8 μm per side of the base sheet was formed on both sides of the base sheet, and the thickness of one side of the metal thin film layer was formed on both sides of the base sheet. Was a camouflaged sheet having a functional resin layer thickness of 14.3 and 19.2 μm.

  The obtained camouflaged sheet had an average thermal emissivity of 0.64, which was slightly higher than that in Example 1, but was excellent in camouflage. Visible light and near-infrared disguise were mixed with the surroundings and were excellent. The flame retardancy was first grade (carbonization length: 3.0 cm, after flame: 0 seconds, residue: 0 seconds) and was excellent. The stowability was excellent.

[Example 6]
(Substrate sheet)
The same one as used in Example 1 was used.

(staining)
The base sheet was dyed with a light green disperse dye in the same manner as in Example 1.

(Metal thin film layer)
A metal thin film layer made of titanium having a thickness of 0.01 μm was formed on one side of the base sheet in the same manner as in Example 1.

(Colorant-containing resin layer)
The thickness of the light green pigment-containing resin layer is 5.0 μm on one side of the substrate sheet and the thickness of the dark green and brown pigment-containing resin layers is the substrate on both surfaces of the substrate sheet in the same manner as in Example 1. A colorant-containing resin layer of 9.8 μm was formed on each side of the sheet.

(Flame retardant resin layer)
A flame retardant resin layer having a thickness of 2.2 μm is formed on one side of the base sheet on both sides of the base sheet in the same manner as in Example 1, and the thickness of one side of the metal thin film layer is formed on both sides of the base sheet. Was a camouflaged sheet having a functional resin layer thickness of 7.2 μm and 12.0 μm.

  The obtained camouflaged sheet had an average thermal emissivity of 0.69, which was slightly higher than that of Example 1, but was excellent in camouflage. Visible light and near-infrared disguise were mixed with the surroundings and were excellent. The flame retardancy was second grade (carbonization length: 5.6 cm, after flame: 0 seconds, residue: 0 seconds). The stowability was excellent.

[Example 7]
(Substrate sheet)
The same one as used in Example 1 was used.

(staining)
The base sheet was dyed with a light green disperse dye in the same manner as in Example 1.

(Metal thin film layer)
A metal thin film layer made of titanium having a thickness of 0.01 μm was formed on one side of the base sheet in the same manner as in Example 1.

(Colorant-containing resin layer)
The thickness of the light green pigment-containing resin layer is 2.1 μm on one side of the substrate sheet and the thickness of the dark green and brown pigment-containing resin layers is the substrate on both surfaces of the substrate sheet in the same manner as in Example 1. A 4.3 μm colorant-containing resin layer was formed on each side of the sheet.

(Flame retardant resin layer)
A flame retardant resin layer having a thickness of 9.5 μm per side of the base sheet was formed on both sides of the base sheet in the same manner as in Example 1, and the thickness of the metal thin film layer on both sides of the base sheet was increased. Was a camouflaged sheet having a thickness of 11.6 and 13.8 μm on one side of the functional resin layer.

  The obtained camouflaged sheet had an average thermal emissivity of 0.66, which was slightly higher than that of Example 1, but was excellent in camouflage. Visible light and near-infrared disguise were mixed with the surroundings and were excellent. The flame retardancy was first grade (carbonization length: 2.9 cm, residual flame: 0 seconds, residual dust: 0 seconds) and inferior. The storage property was slightly inferior to that of Example 1.

[Comparative Example 1]
(Substrate sheet)
The same one as used in Example 1 was used.

(staining)
The base sheet was dyed with a light green disperse dye in the same manner as in Example 1.

(Metal thin film layer)
In the same manner as in Example 1, metal thin film layers made of titanium having a thickness of 0.001 μm were formed on both sides of the base sheet.

(Colorant-containing resin layer)
The thickness of the light green pigment-containing resin layer is 2.3 μm on one side of the base sheet, and the thickness of the dark green and brown pigment-containing resin layers is the base material on both sides of the base sheet in the same manner as in Example 1. A colorant-containing resin layer of 4.5 μm was formed on each side of the sheet.

(Flame retardant resin layer)
In the same manner as in Example 1, a flame retardant resin layer having a thickness of 3.0 μm is formed on one side of the base sheet on both sides of the base sheet, and the thickness of one side of the metal thin film layer on both sides of the base sheet. Was a camouflaged sheet having a functional resin layer thickness of 5.3 and 7.5 μm.

  The obtained camouflaged sheet had an average thermal emissivity of 0.89, and was observed with a far-infrared imaging device. Visible light and near-infrared disguise were mixed with the surroundings and excellent. The flame retardancy was first grade (carbonization length: 3.1 cm, after flame: 0 seconds, residue: 0 seconds) and was excellent. The stowability was excellent.

[Comparative Example 2]
(Substrate sheet)
The same one as used in Example 1 was used.

(staining)
The base sheet was dyed with a light green disperse dye in the same manner as in Example 1.

(Metal thin film layer)
In the same manner as in Example 1, metal thin film layers made of titanium having a thickness of 0.1 μm per side of the base sheet were formed on both sides of the base sheet.

(Colorant-containing resin layer)
The thickness of the light green pigment-containing resin layer is 2.1 μm on one side of the substrate sheet and the thickness of the dark green and brown pigment-containing resin layers is the substrate on both surfaces of the substrate sheet in the same manner as in Example 1. A 4.3 μm colorant-containing resin layer was formed on each side of the sheet.

(Flame retardant resin layer)
In the same manner as in Example 1, a flame-retardant resin layer having a thickness of 2.6 μm per side of the base sheet was formed on both sides of the base sheet, and the thickness of one side of the metal thin film layer was formed on both sides of the base sheet. Was a camouflaged sheet having a functional resin layer thickness of 4.7 μm and 6.9 μm.

  The obtained camouflaged sheet had an average thermal emissivity of 0.20 and was observed with a far-infrared image device. Visible light camouflage had a metallic luster, was not mixed with the surroundings, and was inferior. The near-infrared camouflage was inferior because the near-infrared reflectance was low and not mixed with the surroundings. The flame retardancy was first grade (carbonization length: 4.5 cm, residual flame: 0 seconds, residual dust: 0 seconds) and was excellent. In addition, the storage was excellent.

[Comparative Example 3]
(Substrate sheet)
The same one as used in Example 1 was used.

(staining)
The base sheet was dyed with a light green disperse dye in the same manner as in Example 1.

(Metal thin film layer)
A metal thin film layer made of titanium having a thickness of 0.01 μm was formed on one side of the base sheet in the same manner as in Example 1.

(Colorant-containing resin layer)
The thickness of the light green pigment-containing resin layer is 0.2 μm on one side of the base sheet and the thickness of the dark green and brown pigment-containing resin layers is the base material on both sides of the base sheet in the same manner as in Example 1. A colorant-containing resin layer of 0.3 μm was formed on each side of the sheet.

(Flame retardant resin layer)
In the same manner as in Example 1, a flame-retardant resin layer having a thickness of 0.3 μm per side of the base sheet was formed on both sides of the base sheet, and the thickness of one side of the metal thin film layer was formed on both sides of the base sheet. Was a camouflaged sheet having a functional resin layer thickness of 0.5 and 0.6 μm.

  The obtained camouflaged sheet had an average thermal emissivity of 0.24 and was observed with a far-infrared image device. Visible light camouflage had a metallic luster, was not mixed with the surroundings, and was inferior. The near-infrared camouflage was inferior because the near-infrared reflectance was low and not mixed with the surroundings. The flame retardancy was first grade (carbonization length: 3.3 cm, residual flame: 0 seconds, residual dust: 0 seconds) and was excellent. In addition, the storage was excellent.

[Comparative Example 4]
(Substrate sheet)
The same one as used in Example 1 was used.

(staining)
The base sheet was dyed with a light green disperse dye in the same manner as in Example 1.

(Metal thin film layer)
A metal thin film layer made of titanium having a thickness of 0.01 μm was formed on one side of the base sheet in the same manner as in Example 1.

(Colorant-containing resin layer)
A colorant-containing resin obtained by mixing a light green pigment, a dark green pigment, and a brown pigment with a water-based acrylic resin on each side of the base sheet, and the thickness of the light green pigment-containing resin layer is 16 per side of the base sheet. A camouflage print was applied on a silk screen so that the thickness of the resin layer containing 0.1 μm, dark green and brown pigments was 22.4 μm on each side of the base sheet to form a colorant-containing resin layer.

(Flame retardant resin layer)
A flame retardant resin composed of a urethane resin containing 15% by mass of a bromo flame retardant is applied to both sides of the base sheet by a padding method so that the thickness is 15.8 μm per side of the base sheet. A flame retardant resin layer was formed, and a camouflaged sheet in which the thickness of one side of the metal thin film layer was 0.01 μm and the thickness of one side of the functional resin layer was 31.9 and 38.2 μm on both sides of the base sheet.

  The obtained camouflaged sheet had an average thermal emissivity of 0.91, and as a result of observation with a far-infrared imaging device, the camouflaged sheet was hotter than the surroundings and was not mixed, and the camouflage property was inferior. Visible light and near-infrared disguise were mixed with the surroundings and were excellent. The flame retardancy was worse than the third grade (carbonization length: 16.5 cm, after flame: 10.3 seconds, residue: 10.3 seconds) and inferior. Further, the storage property was slightly inferior to that of Example 1.

[Comparative Example 5]
(Substrate sheet)
The same one as used in Example 1 was used.

(staining)
The base sheet was dyed with a light green disperse dye in the same manner as in Example 1.

(Metal thin film layer)
A metal thin film layer made of titanium having a thickness of 0.01 μm was formed on one side of the base sheet in the same manner as in Example 1.

(Colorant-containing resin layer)
In the same manner as in Comparative Example 4, the thickness of the light green pigment-containing resin layer was 16.0 μm per side of the substrate sheet, and the thickness of the dark green and brown pigment-containing resin layers was the same as that of the base sheet. A colorant-containing resin layer of 31.5 μm was formed on each side.

(Flame retardant resin layer)
In the same manner as in Example 1, a flame retardant resin layer having a thickness of 2.3 μm per side of the base sheet was formed on both sides of the base sheet, and the thickness of one side of the metal thin film layer was formed on both sides of the base sheet. Was a camouflaged sheet having a functional resin layer thickness of 18.3 and 33.8 μm.

  The obtained camouflaged sheet had an average thermal emissivity of 0.85 and was observed with a far-infrared image device. Visible light and near-infrared disguise were mixed with the surroundings and were excellent. The flame retardancy was bad and it was burnt down. Further, the storage property was slightly inferior to that of Example 1.

[Comparative Example 6]
(Substrate sheet)
The same one as used in Example 1 was used.

(staining)
The base sheet was dyed with a light green disperse dye in the same manner as in Example 1.

(Metal thin film layer)
A metal thin film layer made of titanium having a thickness of 0.01 μm was formed on one side of the base sheet in the same manner as in Example 1.

(Colorant-containing resin layer)
The thickness of the light green pigment-containing resin layer is 2.5 μm per side of the base sheet and the thickness of the dark green and brown pigment-containing resin layers is the base material on both sides of the base sheet in the same manner as in Example 1. A colorant-containing resin layer having a thickness of 4.4 μm was formed on each side of the sheet.

(Flame retardant resin layer)
A flame retardant resin composed of a urethane resin containing 15% by mass of a bromo flame retardant is applied to both sides of the base sheet by a padding method so that the thickness is 22.7 μm per side of the base sheet. A flame retardant resin layer was formed, and a camouflaged sheet in which the thickness of one side of the metal thin film layer was 0.01 μm and the thickness of one side of the functional resin layer was 25.2 and 27.1 μm on both sides of the base sheet.

  The obtained camouflaged sheet had an average thermal emissivity of 0.87. As a result of observation with a far-infrared imaging device, the camouflaged sheet was hotter than the surroundings and was not mixed, and the camouflage property was inferior. As for visible light disguise, the color was slightly dull, slightly miscible with the surroundings and inferior. The near-infrared camouflage was excellent because it was miscible with the surroundings. The flame retardancy was first grade (carbonization length: 2.6 cm, after flame: 0 seconds, residue: 0 seconds) and inferior. The storage property was slightly inferior to that of Example 1.

[Example 8]
(Substrate sheet)
The same one as used in Example 1 was used.

(staining)
The base sheet was dyed with a light green disperse dye in the same manner as in Example 1.

(Metal thin film layer)
Aluminum sputtering was performed on both surfaces of the base sheet in an argon atmosphere to form a metal thin film layer having a thickness of 0.01 μm on one side of the base sheet.

(Colorant-containing resin layer)
The thickness of the light green pigment-containing resin layer is 2.2 μm on one side of the base sheet, and the thickness of the dark green and brown pigment-containing resin layers is the base material on both sides of the base sheet in the same manner as in Example 1. A 4.6-μm colorant-containing resin layer was formed on each side of the sheet.

(Flame retardant resin layer)
In the same manner as in Example 1, a flame retardant resin layer having a thickness of 2.3 μm per side of the base sheet was formed on both sides of the base sheet, and the thickness of one side of the metal thin film layer on both sides of the base sheet. Was a camouflaged sheet having a thickness of 4.5 μm and 6.9 μm on one side of the functional resin layer.

  The obtained camouflaged sheet had an average thermal emissivity of 0.53, and as a result of observation with a far-infrared imaging device, it was mixed with the surroundings and was excellent in camouflage. Visible light and near-infrared camouflage were also excellent because they were mixed with the surroundings. The flame retardancy was first grade (carbonization length: 2.9 cm, residual flame: 0 seconds, residual dust: 0 seconds) and was excellent. In addition, the storage was excellent.

[Example 9]
(Substrate sheet)
The same one as used in Example 1 was used.

(staining)
The base sheet was dyed with a light green disperse dye in the same manner as in Example 1.

(Conductive resin layer)
A polyurethane-based conductive resin was applied to one surface of the base sheet so as to have a thickness of 12.1 μm by an intaglio printing machine (gravure printing) to form a conductive resin layer.

(Metal thin film layer)
A metal thin film layer made of titanium having a thickness of 0.01 μm was formed on one side of the base sheet in the same manner as in Example 1.

(Colorant-containing resin layer)
The thickness of the light green pigment-containing resin layer is 2.3 μm on one side of the base sheet, and the thickness of the dark green and brown pigment-containing resin layers is the base material on both sides of the base sheet in the same manner as in Example 1. A 4.9 μm colorant-containing resin layer was formed on each side of the sheet.

(Flame retardant resin layer)
A flame-retardant resin layer having a thickness of 8.9 μm per side of the base sheet was formed on both sides of the base sheet in the same manner as in Example 1, and the thickness of the conductive resin layer was 12 on one side of the base sheet. The camouflaged sheet was 1 μm, the thickness of one side of the metal thin film layer was 0.01 μm on both sides of the base sheet, and the thickness of one side of the functional resin layer was 11.2 and 13.8 μm.

  The obtained camouflaged sheet had an average thermal emissivity of 0.61, and was observed with a far-infrared imaging device. As a result, it was mixed with the surroundings and was excellent in camouflage. Visible light and near-infrared rays were also excellent because they were mixed with the surroundings. Also, it was difficult to find radar waves. The flame retardancy was second grade (carbonization length: 7.5 cm, residual flame: 0 seconds, residual dust: 0 seconds) and was excellent. In addition, the storage was excellent.

[Example 10]
(Substrate sheet)
The same one as used in Example 1 was used.

(staining)
The base sheet was dyed with a light green disperse dye in the same manner as in Example 1.

(Conductive resin layer)
A conductive resin layer having a thickness of 12.8 μm was formed on one side of the substrate sheet in the same manner as in Example 9.

(Metal thin film layer)
A metal thin film layer made of titanium having a thickness of 0.01 μm was formed on one side of the base sheet in the same manner as in Example 1.

(Colorant-containing resin layer)
The thickness of the light green pigment-containing resin layer is 2.1 μm on one side of the substrate sheet, and the thickness of the dark green and brown pigment-containing resin layers is the substrate on both surfaces of the substrate sheet in the same manner as in Example 1. A colorant-containing resin layer of 4.5 μm was formed on each side of the sheet.
(Flame retardant resin layer)
A thickness of a urethane resin containing 15% by mass of titanium oxide (particle size: 0.5 μm), which is a near-infrared reflection adjusting agent, and 15% by mass of a bromo flame retardant, on both surfaces of the base sheet. The material sheet is applied with a relief printing machine (flexographic printing) so as to be 9.5 μm per side of the material sheet to form a flame retardant resin layer, and the thickness of the conductive resin layer is 12.8 μm on one side of the base sheet. A camouflaged sheet having a thickness of one side of the metal thin film layer of 0.01 μm and a thickness of one side of the functional resin layer of 11.6 and 14.0 μm on both surfaces of the material sheet was obtained.

The obtained camouflaged sheet had an average thermal emissivity of 0.63 and was observed with a far-infrared imaging device. As a result, it was mixed with the surroundings and was excellent in camouflage. Visible light and near-infrared camouflage were also excellent because they were mixed with the surroundings. In particular, the near-infrared camouflage was more similar to the surrounding contrast than Example 1 and Example 9, and was excellent. Also, radar waves were difficult to find. The flame retardancy was second grade (carbonization length: 8.9 cm, residual flame: 0 seconds, residual dust: 0 seconds) and was excellent. In addition, the storage was excellent.
The following results are summarized in Tables 1 and 2.

Claims (6)

  In a camouflaged sheet having a functional resin layer including a metal thin film layer, a resin layer containing a colorant, and a flame retardant resin layer on at least one surface of the base sheet, the thickness of the metal thin film layer is 0.003 to 0.00. The thickness of the entire functional resin layer was controlled to be within a range of 1 to 20 μm, and the average heat emissivity of the camouflaged sheet surface was controlled to be 0.35 to 0.70. Camouflaged sheet.   The camouflaged sheet according to claim 1, wherein the thickness of the resin layer containing the colorant constituting the functional resin layer and the thickness of the flame retardant resin layer are both 0.5 to 10 µm. .   The camouflaged sheet according to claim 1 or 2, wherein the resin layer containing the colorant forms a camouflage pattern.   The camouflaged sheet according to any one of claims 1 to 3, wherein the thermal emissivity of the camouflaged sheet surface is distributed in multiple stages.   The camouflaged sheet according to any one of claims 1 to 4, wherein the camouflaged sheet has a conductive resin layer.   The camouflaged sheet according to any one of claims 1 to 5, wherein the camouflaged sheet satisfies a flameproof grade 2 or higher defined by JIS A 1322.