JPH07324280A - Light-screening sheet - Google Patents

Abstract

PURPOSE:To obtain a light-screening sheet maintaining excellent characteristics even after used for a long period by forming a metal layer on one side of a light-transmitting web dyed in a deep color. CONSTITUTION:A metal layer 2 preferably comprising stainless steel or titanium is formed on one side of a light-transmitting web 1 comprising tricot knit fabric produced by dyeing tricot knit fabric comprising e.g. polyester fibers in a deep color (e.g. black color) to obtain a light-screening sheet. The light-screening sheet has an excellent light-screening property similar to those of conventional half mirrors, because the opposite side can brilliantly be looked from one side of the sheet but the one side can sufficiently not be looked from the opposite side by the reflection of light. When the light-screening sheet is attached to the window glass of an automobile, etc., the metal layer 2 of the light-screening sheet is preferably coated with an adhesive 3, and the light-screening sheet is preferably bonded to the inner surface of the window glass through the adhesive layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-shielding sheet which is attached to a window glass of an automobile and used to block light,
In particular, the present invention relates to a light-shielding sheet having a property similar to that of a magic mirror, in which the opposite side can be clearly seen from one side of the light-shielding sheet, but light is reflected from the other side to make it difficult to see the light-shielding sheet. .

[0002]

2. Description of the Related Art Conventionally, as a light-shielding sheet which is attached to a window glass of an automobile or the like to shield light, one made of a plastic film has been generally used.

In such a light-shielding sheet, the entire plastic film is colored or a metal such as aluminum is vapor-deposited on one surface of the plastic film so that the outside can be seen from the inside of the vehicle while the inside of the vehicle is seen from the outside. The one that was made invisible was used.

However, in the light-shielding sheet in which the entire plastic film is colored as described above, in order to prevent the inside of the vehicle from being seen from the outside, the plastic film must be given a very dark color, which causes If the plastic film is colored lightly to make it difficult to see the outside from the inside and to see the outside from the inside of the vehicle, the light blocking effect will be insufficient and the inside of the vehicle will be easily visible from the outside. It was

In the case of a light-shielding sheet using a plastic film as described above, the light resistance is generally poor, and the plastic film is deteriorated by sunlight and cannot be used for a long period of time, or the air permeability is poor. Therefore, when this light-shielding sheet is attached to the window glass of an automobile, there is a problem in that air enters between the light-shielding sheet and the window glass and the attachment becomes difficult.

As a light-shielding sheet using a material other than a plastic film, there has been a cloth having aluminum vapor-deposited on the surface thereof.

Here, in the case of such a light-shielding sheet, light is reflected on the surface on which aluminum is vapor-deposited, making it difficult to see the inside of the vehicle from the outside, and a sufficient light-shielding property is obtained. It is difficult to see, and the deposited aluminum is oxidized by sunlight, and its characteristics are gradually deteriorated.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in a light-shielding sheet which is attached to a window glass of an automobile or the like and used to shield light.

That is, according to the present invention, in the above-mentioned light-shielding sheet, the opposite side can be clearly seen from one side, while light is reflected from the opposite side to be difficult to see, and a sufficient light-shielding property can be obtained. At the same time, it is an object to maintain such characteristics even in long-term use, and to make it easy to attach to a window glass or the like of an automobile.

In order to solve the above-mentioned problems, in the light-shielding sheet according to the present invention, the reflective metal layer 2 is provided on one surface of the light-transmitting cloth 1 dyed in a dark color.
Was formed.

Here, the cloth 1 used in the light-shielding sheet of the present invention may be any cloth such as knitted fabric or woven fabric as long as it is a translucent cloth. When installing and using it, make the other side clear from one side of this light shielding sheet,
From the opposite side, light is reflected by the reflective metal layer 2 formed on the cloth 1 to make it difficult to see, and it is necessary to obtain a sufficient light-shielding property. As No. 1, it is preferable to use a knitted fabric having excellent translucency even if the knitted fabric is clogged to some extent.

The color for dyeing the cloth 1 may be any dark color such as black.

Further, the cloth 1 dyed in such a dark color
The metal used for the metal layer 2 formed on one surface of the above may be any one having reflectivity as described above, and various metals such as stainless steel, titanium and aluminum can be used. In order to prevent this metal from being oxidized by sunlight and losing its properties such as its reflectivity, it is preferable to use stainless steel, titanium, etc., which have excellent properties such as light resistance. .

Various methods can be used to form such a metal layer 2 on one side of the cloth 1, but the formed metal layer 2 is not easily separated from the cloth 1. Therefore, the metal layer 2 is preferably attached to one side of the cloth 1 by sputtering or the like.

[0014]

In the light-shielding sheet according to the present invention, the metal layer 2 is formed like a magic mirror because the metal layer 2 is formed on one surface of the light-transmitting cloth 1 dyed in the dark color as described above. On the surface where the metal layer 2 is formed, a sufficient light-shielding property is obtained, and it becomes difficult to see the opposite side from the surface on which the metal layer 2 is formed, while the opposite side is clearly visible from the surface on which the metal layer 2 is not formed. You can see it.

Further, in the light shielding sheet of the present invention,
Since the metal layer 2 is formed on one surface of the cloth 1 as described above, the cloth 1 is protected by the metal layer 2 and deterioration of the cloth 1 due to ultraviolet rays is reduced, so that the cloth 1 can be stably used for a long period of time. Become.

When titanium or stainless steel is used for the metal layer 2, the metal layer 2 is not oxidized and the characteristics such as reflectivity are not deteriorated, and the metal layer 2 is sputtered or the like to fabric 1. If the metal layer 2 is provided on the cloth 1, the metal layer 2 does not easily peel off from the cloth 1,
It can be used stably for a long time.

Further, in the light-shielding sheet of the present invention, since the cloth 1 is used, the air-permeability is better than that of the plastic film, and when the light-shielding sheet is attached to the window glass of an automobile or the like, the light-shielding sheet and the window are used. There is no chance that air will get in between the glass and the like, making it difficult to attach.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The light shielding sheet according to the embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

In the light-shielding sheet of this embodiment shown in FIG. 1, as the transparent cloth 1, a knitted fabric in which polyester threads of 50d / 24f are warp-knitted by a tricot knitting machine at 35 courses × 32 wales is used. did.

Then, after the cloth 1 made of such a knitted fabric was dyed black, when the metal layer 2 was provided on one surface of the cloth 1, stainless steel was attached to the one surface of the cloth 1 by sputtering.

Here, in providing the metal layer 2 by attaching stainless steel to the cloth 1 by sputtering as described above, a vertical low temperature high rate sputtering apparatus (manufactured by Tokuda Manufacturing Co., Ltd., model number as shown in FIGS. 2 and 3) is used. CFS
-36 PV) was used.

In this sputtering apparatus, as shown in these figures, a cylindrical cathode 21 and a rod-shaped anode 22 each having a stainless steel to be sputtered on at least one side thereof are provided in the container 20 with a required interval. Provided between the anode 22 and the cathode 21 to 500-1
A DC voltage of 000 V was applied.

When the cloth 1 is set in the container 21, static electricity is removed according to the degree of charging of the cloth 1, and then the cloth 1 is wound into a roll shape. The winding shaft 24 is set on the delivery shaft 23 provided on the anode 22 side, and the fabric 1 set in this way is passed over the winding shaft 24, and the winding shaft 24 is rotated via the motor 25 and the transmission unit 26. West,
The cloth 1 set on the delivery shaft 23 is wound onto the winding shaft 2
It was made to wind in 4 sequentially.

In order to reduce the pressure inside the container 20 with respect to the container 20, the vacuum pump 27 is connected through the valve 27a, and the gas used when sputtering is carried out in the container 20. In order to supply to the container 20, the cylinder 28 containing the argon gas and the cylinder 29 containing the oxygen gas are connected via the valves 28a and 29a and the flowmeters 28b and 29b, respectively, and the argon supplied to the container 20 is further supplied. In order to discharge each gas in the container 20 while maintaining the pressure of gas or oxygen gas at a predetermined value, the discharge device 30 was connected via the valve 30a.

When the above-mentioned sputtering apparatus is used to perform sputtering on one side of the cloth 1 and to provide the metal layer 21 made of stainless steel on one side of the cloth 1, the air in the container 20 is vacuum pumped. 27
After depressurizing by, the argon gas is fed into the container 20 from the cylinder 28 containing the argon gas,
The argon gas thus fed into the container 20 was gradually discharged from the discharge device 30 to maintain the inside of the container 20 in a low-pressure argon gas atmosphere.

Then, in this state, a high DC voltage is applied between a cylindrical cathode 21 having stainless steel on one surface and a rod-shaped anode 22 to dissociate the argon molecules in the container 20 to generate argon ions. Was generated. And
When the argon ions are generated in this way, the generated argon ions are accelerated toward the cathode 21 side and collide with the cathode 21, and the stainless steel on one side of the cathode 21 is hammered out by this collision, and is thus hammered out. The produced stainless steel scatters in the container 20 and adheres to one surface of the cloth 1.

Here, when the metal layer 2 is provided on one surface of the cloth 1 as described above, the pressure of the argon gas in the container 20 is 3 × 10 ^{−4 to} 9 × 10 ⁻² To.
It was set within the range of rr. The reason for this is that
If the pressure of the argon gas in the chamber is 3 × 10 ⁻⁴ Torr or less, sputtering becomes difficult, while 9 × 1
This is because if it is 0 ⁻² Torr or more, the blacking phenomenon is likely to occur and the stainless steel attached to the cloth 1 is darkened.

When stainless steel is attached to one side of the cloth 1 to form the metal layer 2, in this embodiment, the cloth 1 is fed from the feed shaft 23 while the stainless is attached to one side of the cloth 1 as described above. Winding shaft 2
The metal layer 2 made of stainless steel was continuously formed on one side of the cloth 1.

The thickness of the metal layer 2 formed on one surface of the cloth 1 is not particularly limited, but as described above, the cloth 1 is formed.
The thickness of the metal layer 2 is generally in the range of 100 to 10000Å.

Further, in the light shielding sheet of this embodiment, the metal layer 2 formed on one surface of the cloth 1 as described above.
Adhesive 3 was coated on. Cloth 1 like this
When the pressure-sensitive adhesive 3 is coated on the metal layer 2 formed on one side of the above, when the light-shielding sheet is attached to a window glass of an automobile, etc., the light-shielding sheet is attached to the inside of the automobile through the adhesive 3 described above. It can be easily attached to window glass.

Next, the light-shielding sheet of this example obtained as described above and the above-mentioned cloth 1 were not dyed in a dark color, and one surface of this cloth 1 was directly subjected to the same procedure as in this example. Using a light-shielding sheet of a comparative example in which the metal layer 2 was formed from stainless steel by sputtering, the transparency of the surface on which the metal layer 2 was attached and the surface on which the metal layer 2 was not attached were compared in each light-shielding sheet.

Here, in comparing the transparency of the respective light shielding sheets of the above-mentioned Examples and Comparative Examples, each light shielding sheet is made of a black mount having a reflectance R of 6.0% and a reflectance R of 84. Place on a 8% white backing paper and measure the reflectance R of light having a wavelength of 600 nm on the surface to which the metal layer 2 is attached and the surface to which the metal layer 2 is not attached by a spectrophotometer (type 307). Hitachi Color Analyzer) and the known Kube from each reflectance R measured in this way.
The K / S values of the surface on which the metal layer 2 was adhered and the surface on which the metal layer 2 was not adhered in each light-shielding sheet were calculated by the lka-Munk equation. Note that K is an absorption coefficient and S is a scattering coefficient.

Next, based on the K / S value obtained as described above, in each light-shielding sheet, the surface on which the metal layer 2 is adhered and the surface on which the metal layer 2 is not adhered are respectively expressed by the following mathematical formula 1. As shown in the formula, the difference ΔK / S between the K / S (white) value when placed on the white mount and the K / S (black) value when placed on the black mount is calculated, and The results are shown in Table 1 below. The larger the value of ΔK / S, the greater the transparency.

[0034]

[Formula 1] ΔK / S = K / S (white) -K / S (black)

[0035]

[Table 1]

As is clear from these results, when the light-shielding sheet of this example and the light-shielding sheet of the comparative example are compared,
On the surface on which the metal layer 2 is formed, the transparency is low and the degree is the same, and on the surface on which the metal layer 2 is formed, sufficient light-shielding property is obtained.
On the surface in which the light-shielding sheet was not formed, the light-shielding sheet of this example had considerably higher transparency than the light-shielding sheet of the comparative example.

For this reason, the light-shielding sheet of this example is clearly visible on the opposite side from the surface on which the metal layer 2 is not formed, as compared with the light-shielding sheet of the comparative example.

[0038]

As described above in detail, in the light-shielding sheet according to the present invention, since the reflective metal layer is formed on one side of the light-transmitting cloth dyed in dark color, the magic mirror As described above, light is reflected on the surface on which the metal layer is formed and sufficient light-shielding property is obtained, and the opposite side becomes difficult to see from the surface on which the metal layer is formed, while from the surface on which the metal layer is not attached. Was able to see the other side clearly.

Further, in the light shielding sheet of the present invention,
Since the metal layer is formed on one surface of the cloth, the cloth is protected by the metal layer, and the cloth is less deteriorated by ultraviolet rays and can be used stably for a long period of time.

In the light-shielding sheet of the present invention, when titanium or stainless is used for the metal layer formed on one side of the cloth, the metal is not oxidized and the characteristics such as the reflectivity of the light-shielding sheet are not deteriorated. When the metal layer is provided on the cloth by sputtering or the like, the metal layer is not peeled off from the cloth and can be stably used for a long period of time.

Further, in the light-shielding sheet of the present invention, since the cloth is used as described above, the air-permeable property is better than that of the conventional light-shielding sheet using the plastic film, and this light-shielding sheet is used for automobile window glass or the like. When installing, there is no chance that air will enter between the light-shielding sheet and the window glass, making it difficult to install, and it will be easier to install it on the window glass of an automobile, and air permeability will be improved. It is now available in as many places as you need.

[Brief description of drawings]

FIG. 1 is a sectional view of a light shielding sheet according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of the side surface side of a sputtering apparatus that forms a metal layer on one surface of a fabric when manufacturing the light shielding sheet according to the embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view of the front side of a sputtering apparatus that forms a metal layer on one surface of a fabric when manufacturing the light shielding sheet according to the embodiment of the present invention.

[Explanation of symbols]

 1 cloth 2 metal layer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B60J 3/00 Z G02B 5/00 Z

Claims (1)

[Claims] 1. A light-shielding sheet comprising a light-transmitting cloth 1 dyed in a dark color, and a reflective metal layer 2 formed on one surface thereof.