JP2004132650A - Camouflage sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camouflage-patterned resin-finished sheet excellent in wear toughness, sunlight toughness and flame resistance. <P>SOLUTION: This sheet has a waterproof resin layer on both sides of a cloth, and at least one side of the waterproof resin layer is formed of a resin layer consisting of two or more layers. A camouflage-print is applied between the layers on the resin layer side of two or more layers, and the surface side of the resin layer is formed of an ultraviolet absorptive transparent resin layer. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a camouflage-patterned resin sheet that can be used for camouflage jeep tops used for military purposes, covers for various heavy weapons, and the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, products in which a camouflage pattern or the like is printed on a resin-processed sheet (hereinafter, referred to as a camouflage sheet) have been widely used for civilian uses such as tablecloths, bags, synthetic leather, and tents (for example, Patent Document 1 or Patent Reference 2). These sheets have a waterproof resin disposed on one or both sides of the fabric, and a camouflage print is applied to the surface of the waterproof resin. Products provided for such application fields are also required to have fastness to friction and fastness to sunlight.However, since the conditions of use are relatively mild, materials such as pigments and binders to be printed are selected and examined. Retains practicality.
[0003]
On the other hand, camouflage sheets are also used for military use (for example, see Patent Document 3). Camouflage sheets used for military use are required to be more flame-retardant than camouflage sheets used for civilian use, and are used for a very long time mainly outdoors. Emphasis is placed on hiding from detection. Therefore, it is necessary to avoid discoloration due to friction or discoloration due to sunlight irradiation while maintaining flame retardancy. However, the conventional camouflage sheet for military use is at present the technology used for civilian use as it is, and it is inferior in flame retardancy and durability, and the sheet life is short. At present, however, it is unavoidable to continue practical use, or to repaint the faded portion using human naval tactics.
[0004]
Furthermore, the camouflage sheet is basically concealed from detection of enemies by mixing and fusing with the natural surroundings of the activity and camouflaging the camouflage sheet. It is rare. However, conventional military camouflage sheets generally have flame retardancy by placing flame-retardant soft vinyl chloride containing antimony trioxide as a flame retardant on both sides of the fabric as a waterproof resin. The camouflage print has a structure in which the flame-retardant soft vinyl chloride resin layer is simply arranged on the surface layer, and even if you try to make a reversible front and back reversible camouflage sheet, the jeep hood wears with the hood bone, the heavy weapon cover At present, practical use by front and back reversible has been abandoned because discoloration due to contact and rubbing occurs and cannot withstand practical use.
[0005]
[Patent Document 1]
Registered Utility Model No. 3039140 [Patent Document 2]
JP 2001-293808 A [Patent Document 3]
JP-A-6-068644
[Problems to be solved by the invention]
The present invention has the problems of the conventional camouflage sheet as described above, namely, the problem of discoloration due to rubbing when used for a long time and light fading when used for a long time while maintaining the flame retardancy of the sheet. The purpose is to eliminate the points by a simple method. Another object of the present invention is to provide a camouflage-patterned resin processed sheet having high durability even when front and back reversible camouflages having different hues and patterns are provided on the front and back of the sheet.
[0007]
[Means for Solving the Problems]
The present inventors have conducted various studies to solve the above problems, and as a result, a waterproof resin layer is disposed on both sides of the fabric, at least one side of the waterproof resin layer is formed of two or more layers, and the waterproof The present inventors have found that a camouflage sheet having a camouflage print between resin layers is excellent in friction fastness, fastness to sunlight, flame retardancy, and suitable for military use, and has completed the present invention.
That is, in the present invention, the waterproof resin layer is disposed on both sides of the fabric, and at least one surface of the waterproof resin layer is composed of two or more layers, and a camouflage print is applied between the waterproof resin layers composed of two or more layers. A camouflage sheet in which a layer on the surface side of a waterproof resin layer composed of two or more layers is formed of a transparent resin layer having ultraviolet absorption, and preferably a waterproof resin layer composed of two or more layers on both sides of the fabric. The camouflage print provided between the waterproof resin layers is the above camouflage sheet characterized in that one surface and the other surface have different hues and / or patterns, more preferably 2 The transparent resin layer constituting the surface layer of the waterproof resin layer composed of at least two layers has a thickness of 20 to 500 μm, and has a visible light transmittance of 60% or more and an ultraviolet light transmittance of 30% or less. Further, in the present invention, preferably, the waterproof resin layers disposed on both sides of the fabric have a mass ratio of 60 parts by mass or more with respect to 100 parts by mass of the fabric, and the waterproof resin layer is oxidized with respect to 100 parts by mass of the vinyl chloride resin. The above-mentioned camouflage sheet comprising a soft flame-retardant vinyl chloride resin containing 5 to 20 parts by mass of antimony, and more preferably a transparent resin layer constituting a surface side of a waterproof resin layer comprising two or more layers, The camouflage sheet is a soft vinyl chloride resin containing no inorganic filler or containing an inorganic filler having a particle diameter of 1 μm or less, and the inorganic filler having a particle diameter of 1 μm or less is pentoxide. It relates to the above camouflage sheet which is antimony.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
The camouflage sheet of the present invention is configured as illustrated in FIGS. The present invention will be described with reference to FIGS. FIG. 1 shows a camouflage sheet having a camouflage print on only one side of the sheet of the present invention, and FIG. 2 shows a camouflage sheet having a camouflage print on both sides of the sheet of the present invention. Here, in FIG. 1, reference numerals 1 and 6 in FIGS. 1 and 2 denote protective resin layers for camouflage prints having excellent transparency and ultraviolet absorption, and preferably having a thickness of 20 to 500 μm. By providing this layer, even if the sheet is worn during practical use, the same layer protects the camouflage print portion and ensures a high resistance to discoloration. Also, even if exposed to sunlight (ultraviolet rays) for a long time, the same layer absorbs ultraviolet rays and protects the camouflage print from the ultraviolet rays. The camouflage print layer is provided on the lower layer 2 in FIG. 1 and 7 and 11 in FIG. The specific method of forming the camouflage print layer is as follows. A sheet in which the camouflage print is applied in advance on one side of the resin layers 1 and 6 and 12 in FIG. 1 and FIG. Alternatively, camouflage printing may be carried out in advance on the waterproof resin layer adjacent to the fabric layer at 3 in FIG. 1 and 8 and 10 in FIG. 2, and the layers may be similarly laminated and integrated in the arrangement shown in FIGS. The method of laminating and integrating is not particularly limited, but, for example, a heat lamination method is suitably used.
[0009]
Next, 4 in FIG. 1 and 9 in FIG. 2 indicate a fabric. The fabric of the present invention is not limited at all, and a knitted or woven fabric using spun yarns and filament yarns made of natural and synthetic fibers can be applied. The fiber material to be applied is more preferably a synthetic fiber made of polyester, vinylon, polyamide or the like from the viewpoint of durability.
[0010]
The resin layer on the side on which the camouflage print, which is the greatest feature of the present invention, is required to have at least one surface composed of two or more layers as illustrated in the figure (1, 3 in FIG. 1). And 6, 8 and 10, 12 in FIG. Although there is no need to limit the resin material used here, soft vinyl chloride is particularly preferable from the viewpoints of flexibility, bending resistance, transparency, and flame retardancy, and in particular, a waterproof resin layer (see FIG. 1, 3 and 5 and 8 and 10) in FIG. 2 preferably impart flame retardancy. As the resin for imparting flame retardancy, a vinyl chloride resin in which 5 to 20 parts by mass of antimony oxide represented by antimony trioxide or antimony pentoxide is blended with respect to 100 parts by mass of the resin is preferably exemplified. Here, if the amount of antimony oxide is less than 5 parts by mass, the flame retardancy of the camouflage sheet cannot be secured, and if it exceeds 20 parts by mass, the cost increases. More preferably, it is 7 to 15 parts by mass. Further, it is more preferable to impart flexibility together with flame retardancy. For example, it is preferable to add 50 to 90 parts by mass of a plasticizer represented by dioctyl phthalate (DOP) to 100 parts by mass of a vinyl chloride resin. If necessary, 0 to 50 parts by mass of an inorganic filler such as calcium carbonate, a pigment, a stabilizer, and an ultraviolet absorber may be added.
[0011]
The waterproof resin layer made of the vinyl chloride resin thus obtained preferably has a mass ratio of 60 parts by mass or more to 100 parts by mass of the fabric. When the amount of the waterproof resin layer is less than 60 parts by mass with respect to 100 parts by mass of the fabric, the flame retardancy and the waterproofness of the camouflage sheet become inferior. More preferably, it is 60 parts by mass or more and 500 parts by mass or less, and still more preferably 100 parts by mass or more and 300 parts by mass or less. The two or more resin layers constituted by the camouflage print of the present invention do not necessarily need to use the same resin material. For example, the resin layer on the fabric side is made of a flame-retardant soft vinyl chloride, and the surface layer is stain-proofed. Use of a resin material typified by a polyacrylic ester or the like having excellent properties does not reduce the effects of the present invention at all.
[0012]
Further, the camouflage sheet of the present invention has two or more waterproof resin layers disposed on both sides of the fabric, and the camouflage print applied between the waterproof resin layers has a hue and color on one surface and the other surface. Preferably, the patterns are different. Such a camouflage sheet can be practically used as a reversible camouflage sheet having different hues and patterns on the front and back of the sheet. The hue and / or pattern of the camouflage print is not limited at all. For example, one surface is a camouflage pattern having a high green area ratio for spring and summer, and the other surface is a brown color for fall and winter. Consideration is given to making the area ratio a high camouflage pattern.
[0013]
Furthermore, in order to further enhance the effect of the present invention, the resin layer of the two or more layers on the side on which camouflage is applied, the resin layer on the outer layer (layer on the surface side) from the portion on which the camouflage print is applied is an ultraviolet ray It is necessary that the transparent resin layer is composed of an absorptive transparent resin layer, and the transparent resin layer preferably has a visible light transmittance of 60% or more. If the visible light transmittance is less than 60%, the camouflage pattern lacks sharpness. It is more preferably at least 70%, further preferably at least 80%. Further, the ultraviolet transmittance of this resin layer is preferably 30% or less. If it exceeds 30%, the effect of preventing fading of the camouflage-colored portion will be reduced when sunlight is irradiated during practical use. From the viewpoint of the light fastness of the camouflage color, it is preferably at most 30%, more preferably at most 20%, even more preferably at most 10%. Further, it is more preferable to perform an embossing process for providing microscopic unevenness on the surface in order to suppress the gloss of the resin layer from the viewpoint of the camouflage effect of the camouflage sheet itself.
[0014]
The thickness of the transparent resin layer constituting the surface layer of the camouflage sheet of the present invention is preferably 20 to 500 μm or less. When the thickness of the transparent resin layer is less than 20 μm, the effect of protecting the printed portion from being rubbed and the effect of protecting the printed portion from ultraviolet rays become insufficient. On the other hand, when the thickness of the transparent resin layer is larger than 500 μm, the sheet becomes heavy, and when used for the camouflage sheet of the present invention, there is a possibility that a problem may arise in practicality. More preferably, it is 50 μm or more and 400 μm or less.
[0015]
Further, the transparent resin layer constituting the surface layer of the camouflage sheet of the present invention preferably retains high transparency and protects the camouflage print portion while not impairing the flame retardancy of the camouflage sheet, and a resin having such performance. For example, a soft vinyl chloride resin as exemplified below is suitable. The soft vinyl chloride resin suitable for the transparent resin layer constituting the surface layer of the camouflage sheet of the present invention includes: 1) a phosphorus-based resin represented by tricresyl phosphate (TCP) as a part of a plasticizer mixed in the resin; Or 2) a general-purpose plasticizer such as DOP having an excellent balance of performance, and a flame retardant represented by antimony oxide having a particle diameter of 1 μm or less for the purpose of further ensuring flame retardancy. Any of the above resins is preferred, but among these methods, the resin containing the phosphorus-based flame retardant plasticizer of 1) has a problem that the low-temperature property of the resin layer is impaired. From the point of view, a resin in which a general-purpose plasticizer such as DOP of 2) and a flame retardant represented by antimony oxide having a particle diameter of 1 μm or less are used in combination and blended is more preferable. In the resin of 2), when the particle diameter of the compounded antimony oxide is larger than 1 μm, there is a problem that the camouflage pattern in the lower layer becomes unclear due to its hiding effect. Preferably it is 0.5 μm or less, more preferably 0.2 μm or less. The antimony oxide is not particularly limited, but antimony pentoxide is preferred.
[0016]
The camouflage sheet of the present invention has excellent fastness to friction and fastness to sunlight while maintaining flame retardancy, and has very little change in the initial hue and color pattern even when used for a long time. Therefore, it can be used for camouflage jeep tops used for military use, covers for various heavy weapons, and the like.
[0017]
【Example】
Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited thereto. In the examples of the present invention, the visible light transmittance of the resin layer, the ultraviolet light transmittance of the resin layer, and the thickness of the resin layer are determined by the following methods.
[0018]
[Visible light transmittance of resin layer%]
The light transmittance of the resin sheet in a wavelength range of 400 to 700 nm is measured with a spectrophotometer UV-3100PC (manufactured by Shimadzu Corporation), and the light transmittance determined by the following equation is defined as the visible light transmittance of the resin layer.
Visible light transmittance (%) = (A / B) × 100
Here, A: integrated area of the transmittance curve in the 400 to 700 nm region of the resin sheet B: integrated area of the transmittance curve without the sheet
[UV transmittance of resin layer%]
The light transmittance at a wavelength of 350 nm in the ultraviolet region is measured by a spectrophotometer UV-3100PC (manufactured by Shimadzu Corporation) and defined as the ultraviolet transmittance of the resin layer.
[Resin layer thickness μm]
Twenty cross sections (n = 20) of the camouflage sheet are observed and measured with a scanning electron microscope (“S-510” manufactured by Hitachi, Ltd.), and the average value is defined as the resin layer thickness.
[0020]
[Example 1]
A woven fabric having a plain weave structure in which a polyester multifilament yarn of 830 dtex was driven into a warp and a weft at 20 and 22 yarns / inch, respectively, was used as a fabric. (A) 100 parts by mass of a light green vinyl chloride resin ["Geon 103 EP" manufactured by Zeon Corporation], 65 parts by mass of DOP, 20 parts by mass of calcium carbonate, 10 parts by mass of antimony trioxide, 200 μm thick soft vinyl chloride resin layer composed of 3 parts by mass of pigment, 2 parts by mass of zinc stearate and 1 part by mass of calcium stearate, (b) light green color (resin composition is the same as (a)) 200 μm thick soft vinyl chloride resin layer with camouflage print of dark green, brown and black colors on one side, (c) 55 parts by mass of vinyl chloride resin [“Geon 103 EP” manufactured by Zeon Corporation], antimony pentoxide [Nissan Chemical Industries, Ltd., average particle size 0.1 μm] 7 parts by mass, zinc stearate 2 parts by mass, calcium stearate A transparent soft vinyl chloride resin layer having a visible light transmittance of 85% and an ultraviolet transmittance of 3% having a thickness of 100 μm and a thickness of 100 parts by mass is composed of (a) / fabric / (b) / As a constitution of (c), they were laminated by heat lamination and integrated. In addition, the camouflage print side of the resin layer of (b) was thermally laminated with the resin layer of (c) to obtain a camouflage sheet. The camouflage sheet thus obtained was attached to a Taber abrasion tester of JIS K7204, the load applied to the abrasion wheel H-22, the test piece was set to 4.9 N, abrasion was performed 1,000 times, and the friction fastness was reduced. It was measured. Inspection of the degree of discoloration of the camouflage print after the abrasion revealed with the naked eye that the camouflage print did not discolor at all even though the surface resin was slightly whitened by the abrasion and was found to have excellent friction durability. In order to evaluate the sunlight fastness of the camouflage sheet, the sheet was attached to a sunshine weatherometer based on the ISO standard and irradiated for 1000 hours. It was at the level of a color chart (No.), and it was confirmed that it had almost the same excellent light fastness as before irradiation. In addition, when a combustion test was carried out according to the JIS L1091A-1 method, it was found to have good flame retardancy of Category 2.
[0021]
[Comparative Example 1]
A conventional camouflage sheet having no ultraviolet-absorbing transparent resin layer (c) as shown in FIG. 3 was prepared, and its fastness to friction and fastness to sunlight were evaluated. In the sheet after this friction, the camouflage print portion disappeared completely due to abrasion, and in the sheet after irradiation with the sunshine weatherometer, the color was significantly faded, and it was determined by the grading and fading gray scale of JIS L0804 to 1-2. It was at the color chart (number) level.
[0022]
【The invention's effect】
The camouflage sheet of the present invention is superior to conventional camouflage sheets in the fastness to friction and the fastness to sunlight, and has a very small change in the initial hue and color pattern even when used for a long time. Therefore, it is useful for camouflage jeep tops used for military use, covers for various heavy weapons, and the like.
[Brief description of the drawings]
FIG. 1 is a perspective view of a camouflage sheet according to the present invention in which one surface of a fabric is constituted by two waterproof resin layers, and a resin layer on a surface side of the two waterproof resin layers is a transparent waterproof resin layer. Sectional view.
FIG. 2 shows a camouflage sheet according to the present invention, in which both sides of the fabric are composed of two waterproof resin layers, and of the two waterproof resin layers on both sides, the resin layer on the surface side is a transparent waterproof resin layer. Sectional view.
FIG. 3 is a cross-sectional view of a conventional camouflage sheet having only one waterproof resin layer.
[Explanation of symbols]
1. 1. A transparent waterproof resin layer constituting the surface side 2. Camouflage print layer 3. a waterproof resin layer adjacent to the fabric layer; 4. Fabric layer 5. waterproof resin layer 6. Transparent waterproof resin layer constituting the front side 7. Camouflage print layer 8. Waterproof resin layer adjacent to fabric layer Fabric layer10. 10. Waterproof resin layer adjacent to fabric layer Camouflage print layer12. 12. A transparent waterproof resin layer constituting the surface side Camouflage print layer 14. 14. Waterproof resin layer adjacent to fabric layer Fabric layer 16. Waterproof resin layer adjacent to fabric layer

Claims (6)

A waterproof resin layer is disposed on both sides of the fabric, at least one surface of the waterproof resin layer is composed of two or more layers, and a camouflage print is applied between the waterproof resin layers composed of two or more layers. A camouflage sheet in which a layer on the surface side of the waterproof resin layer formed as described above is formed of a transparent resin layer that absorbs ultraviolet light. A waterproof resin layer composed of two or more layers is disposed on both sides of the fabric, and the camouflage print applied between the waterproof resin layers has different colors and / or patterns on one surface and the other surface. The camouflage sheet according to claim 1, characterized in that: The transparent resin layer constituting the surface side of the waterproof resin layer composed of two or more layers has a thickness of 20 to 500 μm, and has a visible light transmittance of 60% or more and an ultraviolet light transmittance of 30% or less. Camouflage sheet described in. The waterproof resin layers disposed on both sides of the fabric have a mass ratio of 60 parts by mass or more with respect to 100 parts by mass of the fabric, and the waterproof resin layer has 5 to 20 parts by mass of antimony oxide with respect to 100 parts by mass of the vinyl chloride resin. The camouflage sheet according to any one of claims 1 to 3, comprising a soft flame-retardant vinyl chloride resin blended. The transparent resin layer constituting the surface side of the waterproof resin layer composed of two or more layers is a soft vinyl chloride resin containing no inorganic filler or containing an inorganic filler having a particle diameter of 1 μm or less. The camouflage sheet according to any one of claims 1 to 4. The camouflage sheet according to any one of claims 1 to 5, wherein the inorganic filler having a particle size of 1 µm or less is antimony pentoxide.

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