JPH02289146A - Cloth for camouflage nets - Google Patents

Abstract

PURPOSE:To obtain the title cloth which has camouflage effect against radar waves by knitting the covering yarns which comprise electroconductive core yarn of a specific diameter and the synthetic filament sheath yarns and coloring the knitted fabrics with dyes or the like. CONSTITUTION:(A) An electroconductive fiber of 10 to 150mum, which is made of copper or aluminum, is used as core yarns, while (B) synthetic filaments are used as sheath yarns, to give covering yarns. The covering yarns are knitted together with filaments (B) and the knit fabrics are colored in stripes or the like by, for example, printing with (C) a dye which can reflect the light of more than 700nm wavelength.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Applicability) The present invention relates to a camouflage material having a camouflage effect against infrared rays, near infrared rays, and radar.

(Prior Art) The current sophistication of electronic devices has further increased the need to disguise targets from monitoring using radar radio waves, infrared rays, and near-infrared rays.

Conventional radar radio wave (ultra-high frequency) scattering products use non-woven fabric as a base material, and small pieces of conductive metal or short fibers of conductive metal are spread and fixed to the surface fibers for extremely ultrasonic scattering. Non-woven fabrics are known. However, since these are based on non-woven fabric, they have low physical strength such as tensile strength and tear strength, and they do not have good morphological stability to maintain a certain shape, so it is difficult to provide Okawa performance. I couldn't do it.

The knitted fabric disclosed in Korean Patent Publication No. 81-1207 uses a blended yarn of synthetic short fibers and conductive metal fibers such as stainless steel mesh fibers to knit a mesh to cover the above-mentioned drawbacks. However, both sides of this net were coated and bonded with a flexible film.

Further, Jikai No. 11R59-47442 discloses a radar radio wave scattering fabric in which conductive metal-deposited film threads are arranged between synthetic fiber filament threads.

Japanese Unexamined Patent Publication No. 5”1-139982 Japanese Unexamined Patent Publication No. 56-107
No. 00 and Japanese Unexamined Patent Publication No. 56-34099 also have radar reflective properties. A fabric using spun yarn uniformly mixed with an electrically conductive substance (fine metal wire, etc.) has been disclosed as a net-like knitted fabric.

However, all of these conventional techniques have a uniformity and uniformity of conductive fibers.
The fabric used blended yarns and had a scattering effect only on radar radio waves. In addition, since the conductive fibers are uniformly blended, there are problems in that the fiber-making properties and the conductive fibers are not compatible with dyeing and finishing chemicals, so the dyeing properties are poor.

Also, a technical group that has a camouflage effect against infrared rays is known, but this technology is not effective against radar radio wave scattering.

(Problem Mn to be Solved by the Invention) The present invention solves the problems of the prior art, namely, has an excellent camouflage effect against both radar radio waves, infrared rays, and near-infrared rays, and The purpose of the present invention is to provide a fabric for camouflage netting that has excellent dyeing processability.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention was arrived at as a result of intensive studies. That is, the present invention is an inter-knit/inter-woven fabric composed of a synthetic fiber filament yarn and a covering yarn using a conductive fiber with a diameter of 10 to 150 p as a core yarn and a synthetic fiber filament yarn as a W7 yarn. , the fabric has a wavelength of 700
Dyes and/or dyes with strong reflectance in the nm to 1 μm region
Or it is a camouflage net 41 piece colored with pigment.

The conductive fibers used in the present invention include metal fibers, regenerated cellulose fibers, fibers made by metallizing natural fibers or synthetic fibers by metal plating or metal vapor deposition, or activated carbon fibers. Preferred fibers are metal fibers, especially copper and aluminum fibers. It is a thin wire with tin or nickel plating on the surface of the wire or copper wire.

The conductive fiber has a diameter of 1O-150ps, preferably 2
It is 0 to 100u.

The fabric referred to in the present invention is a woven or knitted fabric made of yarn containing the conductive fibers described in 1111, or a mixed-knit fabric or a mixed woven fabric of yarns containing and not containing the conductive fibers, but preferably yarns containing the conductive fibers. It is a mixed woven fabric with yarn that does not contain

The yarn (A) containing conductive fibers is a core yarn or a covering yarn in which the conductive fiber is used as a core yarn and a non-conductive fiber is used as a sheath yarn, but preferably a covered yarn.

Yarn CB) that does not contain conductive fibers is spun yarn made of ordinary fibers or synthetic fiber filament yarn, but preferably polyester or polyester having a strength of 8.5 g/d or more, preferably 7.5 g/d or more. It is a polyamide multifilament. The ratio of (A) and (B) is 1:0 in the case of mixed woven fabrics.
~1:5 is preferred.

In the present invention, a special agent is applied to the above-mentioned knitted fabric to impart a camouflage effect to infrared rays and near-infrared rays, and this agent has a wavelength of 700 nm or more to be effective against tree lines.] ] A green dye or pigment with strong reflective properties is used. Particularly preferred is wavelength 4.
It is a dye or pigment that has reflective properties in the wavelength range of 50 to 550 nm and 700 nm or more.

In order to achieve an effective camouflage effect, it is preferable to dye the fabric with a brown color and a striped pattern or block pattern rather than dyeing with a single color of L dye or pigment.

How to add dye or pigment to give a camouflage effect to knitted fabrics? There are methods to apply f (!!, m) by spraying, by blend coating with a resinous material, or by using a printing force method. The fabric according to the present invention uses a covering yarn containing conductive fibers and is coated with a dye and pigment composition that absorbs infrared and near-infrared rays. Radio waves and infrared
It has a camouflage effect against both near-infrared rays, and since the conductive fiber-containing covering yarn has conductive fibers as the core yarn and normal yarn as the sheath yarn, it is suitable for knitting and weaving by mixing conductive fibers, especially metal fine wires. Low sex and dyeing - ", no low sex,
It has two properties: knitting, weaving, and dyeing, which are the same as using ordinary thread.

In particular, when the coloring side has a low E property, it is necessary to coat it with a dye and pigment composition that has an absorbing effect on infrared and near-infrared rays.
To provide a fabric for a camouflage net that has a desirable effect on the processing properties when it is coated, thereby contributing to a change in the durability of the coating layer to blue tinting, and that can be used for a long period of time.

(Example) Example 1 Copper wire-containing covering yarn (A) made of a 210-denier 24-filament polyamide multifilament with a strength of 7.8 g/d and a covering number of 400 T/M using a thin copper wire with a diameter of 50 μ as the core yarn. Strength 7.8g/d2
A polyamide multifilament (B) of 10 denier and 24 filaments was mixed and woven, the ratio of A and B was changed, and a fabric was prepared with a constant warp x weft density of 34 pieces/i opening x 34 pieces/in. This fabric is coated with a viscous composition made by blending vinyl chloride resin with a green pigment that has a camouflage effect on infrared rays on about 520 planes and a reflective property below 780 nm, and is coated with a camouflage material. Obtained. The effectiveness of this camouflage material against radar waves is +A! : (Shielding effect) was evaluated by ASTM dual chamber method (71111 constant wavelength 10GH2). The results are shown in Table 1.

From the results in Table 1, a preferable shielding effect can be obtained if the usage ratio (A:B) of the yarn containing conductive wire (A) and the yarn CB that does not contain conductive yarn is 1=5 or less, but (B) It is clear that when the usage ratio becomes large (1:6 or more), no significant effect can be obtained.

Table 1 Camouflage effect using infrared rays: O mark indicates that it is effective.

Example 2 The same covering yarn and polyamide filament as in Example 1 were interwoven at a l:1 ratio, and the strength of the fabric and the fabric 11f1. > is shown by the solid line in FIG.

As a comparative example, one stainless steel fiber in the conventional invention was used.
0% content polyester spun yarn 20S and high strength polyester spun yarn 20S (1200g strength) at I:1
Figure 1 shows the strength of the fabric and the fabric strength when mixed with
...Small the lines.

As a result, the fabric of the present invention achieves a cost saving of about 40% compared to the conventional fabric at the same strength and strength, and is extremely easy to handle.

Example 3 Intersection of (A) and (B) obtained in Example 1 with a ratio of 1=2
A colored paste having a dye composition of the following formulation was prepared from the product 1iii, and using this colored paste, a printed fabric with a green and light brown striped pattern was obtained.

The resulting fabric had a radar wave attenuation effect of -14 dB and an infrared camouflage effect of 1° according to the same evaluation method as in the example (the infrared camouflage effect determined by the judgment effect was excellent).

Staining formula Mlkethren Light Brown Gold O
range G s# 0.520ran
ge RRTS s/V O,3O
Nt12 Br111. green
FFB s# 0.06Dark Blue
BOA s/f O, 38 Mikethr
en Light Green Gold O
range G s# 0.80Brj11
．． Green FFB s/V O, 42
Dark Blue BOA s/f
O, 40 Example 3 A fabric obtained by mixing and weaving the covering yarn (A) obtained in Example 1 and polyamide multifilament yarn (B) at a ratio of 1:1 (the present invention) and used as a comparative example in Example 2. A 1=1 mixed woven fabric (conventional method) of No. 20 L polyester spun yarn containing 10% stainless fiber and No. 20 high-strength polyester spun yarn (conventional method) was coated with the same blue composition as in Example 1. The durability of the shielding effect against radar radio waves and the camouflage effect against infrared and near-infrared radiation was evaluated. The results are shown in Table 2.

Table 2 early ■ figure *O: There is a camouflage effect, ×: There is no camouflage effect.

(Effects of the Invention) According to the present invention, a fabric for camouflage netting that has an excellent camouflage effect against radar electric branches, infrared rays, and near infrared rays, has excellent durability of the camouflage effect, and has excellent strength properties. obtain.

[Brief explanation of drawings]

Figure 1 shows the fabric weight (g/I/
) and fabric strength (kg/a-), where the solid line shows the present invention and the dotted line shows the prior art. Misao? fJJ rumor rumors

Claims (1)

[Claims] A mixed-knit or mixed-woven fabric composed of a covering yarn and a synthetic filament yarn using a conductive fiber with a diameter of 10 to 150 μm as a core yarn and a synthetic filament yarn as a sheath yarn, and the fabric has a wavelength of 700 nm or more. A fabric for camouflage netting, characterized in that it is colored with dyes and/or pigments that have strong reflective properties.