JP2007211353A - Shading net excellent in heat-shielding property - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive shading net successfully satisfying heat-shielding property and shading property, having flexibility and endurance and excellent in heat-shielding property. <P>SOLUTION: The shading net is obtained by forming a metal layer 2 in which a metal is physically deposited on one side of a net fabric or a fabric composed of a synthetic fiber and having ≥70% light shielding ratio. In the shading net, the metal for physical deposition is a stainless steel and the thickness of the metal layer 2 for physical deposition is ≥20 nm and a raschel net or a leno weaving is used as the net fabric or the fabric. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a light-shielding net for preventing direct sunlight used outdoors. More specifically, it is used for sun protection in pools, grounds, sand beaches, passageways, etc.

Conventionally, tents using heavy cloth are generally used for preventing direct sunlight used outdoors, and mesh sheets are used in part.
Tents using such heavy cloths and mesh sheets are used, for example, as shades for grounds, pools, and the like.
In the agricultural field (see, for example, Patent Document 1), a light-shielding net is proposed in which a film obtained by laminating an aluminum film and an undeposited film on a film is formed by knitting a thin slit film. Yes.

Japanese Utility Model Publication No. 5-33339

However, tents using heavy cloth have poor air permeability and poor flexibility, and thus have difficulty in workability. On the other hand, the mesh sheets have a problem that they are inferior in durability although they are breathable.
Further, according to the technique described in Patent Document 1, it is possible to obtain a material having air permeability, light shielding properties and heat shielding properties, but it is difficult to deposit metal uniformly on the film surface. In order to satisfy the properties and heat shielding properties, it is necessary to deposit a thick metal layer. For this reason, the film on which the metal is deposited loses flexibility. In addition, there is a problem that the laminated film is expensive because it takes time to cut it into a strip shape, and there is a problem that the knitting network property is inferior due to lack of flexibility.
The present invention has been made in view of such conventional problems, and provides a light-shielding net that sufficiently satisfies heat-shielding properties and light-shielding properties, and is flexible, durable, and inexpensive. For the purpose.

In order to achieve the above-described object, the light-shielding net with excellent heat-shielding properties according to the present invention has the following features.
A net or cloth made of synthetic fibers having a light shielding rate of 70% or more, wherein a metal is physically vapor-deposited on one side thereof. Further, the metal for physical vapor deposition is stainless steel, and the thickness of the metal layer for physical vapor deposition is 20 nm or more.
Further, a Russell net or a knit weave is used as the net or cloth.

The light-shielding net with excellent heat-shielding property of the present invention is a light-shielding net mainly composed of a shaded Russell network used outdoors, and has a light-shielding rate of 70% or more. Alternatively, by using the fabric, the light-shielding net itself can be provided with air permeability and light-shielding properties in the sun leaking condition, and acts so as to sufficiently function as a suitable sunshade.
Here, a Russell netting can be used as the netting, and a knit weave can be used as the cloth. For example, polyester fiber, polyethylene fiber, aromatic polyamide, wholly aromatic polyester, ultrahigh molecular weight polyethylene, or the like can be used.
Further, by performing physical vapor deposition processing of metal on such a mesh or cloth, a light-shielding net having excellent heat shielding properties and durability and air permeability can be obtained.
Moreover, in the light-shielding net according to the present invention, the metal used for physical vapor deposition is made of stainless steel, so that the heat-shielding property is excellent, and the thickness of the metal layer is 20 nm or more so that it is uniform and durable. A certain shading net can be obtained.

The light-shielding net according to the present invention has a light shielding property of 70% or more by adjusting the mesh of the Russell network, thereby obtaining a light shielding property in the state of leakage through a forest. By physical vapor deposition processing, it has excellent heat shielding properties, and at the same time it is possible to reduce fiber degradation due to ultraviolet rays, improving durability and excellent flexibility, so that workability during tailoring processing is improved. Will be good.
Furthermore, since electrical conductivity is obtained by physical vapor deposition processing of metal, generation of static electricity can be suppressed, and adhesion of dirt in the atmosphere can be prevented.

Hereinafter, an embodiment of a light shielding net having excellent heat shielding properties according to the present invention will be described.
The light-shielding net with excellent heat-shielding properties according to the embodiment of the present invention is made of, for example, a net cloth made of a Russell net or the like, or a cloth such as a knit weave. By adjusting the mesh of these net fabrics and setting the shading rate to 70% or more, a natural forest bath, that is, a sunbeam phenomenon can be achieved, thereby improving human physiological phenomena.
Here, when the light shielding ratio is 70% or less, the light shielding performance is lowered and the object is not achieved. In addition, when the eyes are completely closed like a tent using heavy cloth and the light-shielding property is 100%, the air permeability is poor and it is impossible to secure the sunbeams state. The light shielding property is preferably 75% to 90%.

  Moreover, as the yarn for the net woven fabric of the raschel net fabric and the leash fabric used as the net fabric, for example, polyester fiber, polyethylene fiber, aromatic polyamide, wholly aromatic polyester, ultrahigh molecular weight polyethylene, or the like can be used. Furthermore, recycled yarn (eco yarn) and polylactic acid can be used from the viewpoint of environmental protection.

In addition, as shown in FIG. 2, the present invention is configured such that a metal layer 2 having a thickness of 20 nm or more formed by physical vapor deposition is provided on one side of the above-described net cloth or cloth 1.
Here, in the configuration in which the metal layer 2 is provided, heat rays incident from one of the light shielding nets are reflected by the metal layer 2. The heat rays that have not been reflected are mostly absorbed by the metal layer 2 and are not easily transmitted to the opposite surface of the light shielding net. For this reason, the heat ray does not reach the net or cloth 1 on the opposite side of the metal layer 2. And since the light-shielding net | network of this invention has air permeability, the heat absorbed by the metal layer 2 which has on one side is radiated | emitted in air | atmosphere by a natural wind. Therefore, it is necessary to install the metal surface on the outside, that is, on the sunlight side.
The reason why the metal layer 2 is provided on one side is that not only the flexibility of the light-shielding net is hindered, but also the manufacturing cost increases and an inexpensive light-shielding net cannot be obtained.

Furthermore, the metal layer 2 can be formed by, for example, uniforming the coating of the metal layer 2 by physical vapor deposition in a vacuum furnace. And even if the thickness of the metal film is thin, it is possible to obtain heat shielding properties, but the thickness of the metal layer 2 is preferably 20 nm or more. This is because when the thickness of the metal layer 2 is 20 nm or less, the metal layer 2 often does not form a uniform film, and sufficient heat shielding properties and light resistance may not be obtained. On the other hand, when the thickness of the metal layer 2 is 200 nm or more, not only the flexibility of the Russell net is hindered, but the manufacturing cost increases and an inexpensive light-shielding net cannot be obtained.
Here, the reason why the above flexibility is required is that workability such as sewing work is improved and productivity is improved. In addition, the metal layer 2 is formed by physical vapor deposition on one side of a mesh material or cloth material. This is because, even if the metal layer 2 by physical vapor deposition is provided on both sides, the heat shielding property is satisfied, but flexibility is hindered and the production cost of physical vapor deposition is also expensive.

Moreover, it is preferable to use stainless steel for the metal for physical vapor deposition of the present invention. By using stainless steel, the heat shielding property is excellent. Moreover, since conductivity is obtained by using stainless steel, static electricity can be prevented, so that adhesion of dust and the like in the atmosphere can be prevented, and the adhered dirt can be easily removed by washing or the like. It becomes possible. Further, the metal layer 2 can prevent radio interference.
Since the metal layer 2 is uniformly applied to the surface of the Russell net by the physical vapor deposition process of the present invention, the synthetic fibers used in the Russell net can be protected from UV rays, and the UV degradation of the fibers can be greatly reduced. Durability is improved.

<Example>
Next, the light shielding net with excellent heat shielding properties according to the present invention will be described based on specific examples.
As the network used, the Russell net shown in FIG. 1 was used.
A 285 decitex polyester fiber was knitted with a four-ply raschel knitting machine to form a net by adjusting the stitches so that the light shielding rate was 70% or more.
SUS310 stainless steel was vacuum-deposited on one side of the woven net. The conditions of the vacuum physical vapor deposition processing were as follows: chamber internal pressure was 4 × 10 ⁻² Pascal, processing speed was 3 m / min, applied voltage was 500 v, current was 60 A, and the physical vapor deposition gas was argon. At this time, a light shielding rate of 75% and a metal thickness of 30 nm were used.

<Comparative Example 1>
Except for adjusting the stitches so that the shading rate of the Russell net was 65%, the shading net was processed in the same manner as in the example.
<Comparative example 2>
A light-shielding net without a metal vapor-deposited layer was formed by a raschel net knitted in the same manner as in the example.
<Comparative Example 3>
A heat shielding test and a light resistance test were carried out from a surface that was not subjected to physical vapor deposition using a knitted net and a processed light shielding net in the same manner as in the Examples.

Evaluation in the examples was performed as follows.
(1) The light shielding property was measured by JIS L1055 A method.
(2) Thermal insulation was measured according to FIG. That is, the black cloth 4 is laid on the bottom of the test box 3 each having a length × width × height of 20 cm, and a thermocouple 5 is set thereon. The test body A is installed in the upper part of the box, and a light source is irradiated from the projector 6 set in the upper part, and the temperature is simultaneously measured. The temperature was measured every 10 minutes, 30 minutes and 1 hour.
(3) The strength of the Russell net was measured according to JIS L1018.
(4) Light resistance was irradiated for 20 hours using an iSuper UV tester manufactured by Iwasaki Electric Co., Ltd. The strength of the Russell network before and after irradiation was measured by the method (3) above, and the strength ratio was defined as light resistance.

<Comparison result>
For the examples and comparative examples, the results are shown in the table for light shielding properties, heat shielding properties, and light resistance.

As shown in Table 1, in the examples, the heat shielding property is excellent and the light resistance is good. On the other hand, Comparative Example 1 had low heat shielding properties and light shielding properties. In Comparative Example 2, both the heat shielding property and light resistance were poor. In Comparative Example 3, the heat shielding properties and light shielding properties were satisfactory, but the light resistance was poor.
As described above, the light-shielding nets according to the examples were excellent in heat-shielding and light-shielding properties, and had good light resistance, so that the light-shielding nets with excellent durability could be obtained.

It is a front view which shows the structure of this invention. It is an expanded section of the present invention. It is explanatory drawing which shows the test state of the Example of this invention.

Explanation of symbols

1 Netting or cloth 2 Metal layer 3 Test box 4 Black cloth 5 Thermocouple 6 Floodlight A Test cloth

Claims (5)

  A light-shielding net having excellent heat-shielding properties, characterized in that it is a net or fabric made of a synthetic fiber and having a light-shielding rate of 70% or more, and a metal is physically vapor-deposited on one surface thereof.   2. The light shielding net with excellent heat shielding properties according to claim 1, wherein the metal for physical vapor deposition is stainless steel, and the thickness of the metal layer for physical vapor deposition is 20 nm or more.   3. The light shielding net having excellent heat shielding properties according to claim 1, wherein the light shielding ratio is 75% to 90%.   A light shielding net having excellent heat shielding properties, wherein a Russell network is used as the mesh according to any one of claims 1 to 3. A light-shielding net excellent in heat-shielding property, wherein a knit weave is used as the fabric according to any one of claims 1 to 3.

Images