JPS622112Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a see-through heat ray reflective sheet, and more particularly to a heat ray reflective sheet that has a matte surface and is transparent.

Conventionally, heat ray reflective sheets, sunshade sheets, etc. that block solar heat or artificial heat have been made using aluminum foil or aluminum vapor-deposited films on the surface of base materials such as plastic films, fiber cloth, glass fiber cloth, asbestos cloth, and leather sheets. , or those provided with a so-called metal reflective surface such as a metal powder pigment coating layer are used, but these all have a heat ray blocking effect due to the opacity of the base material or the opacity of the metal reflective surface layer. However, it has a major drawback in that it cannot be seen through, making it completely inapplicable to products that require seeing through.

On the other hand, semi-transparent reflective sheets and reflectors are used as transparent sunshade sheets, which are made by coating a transparent plastic film or glass plate with a thin film of metal vapor deposition, but in this case, it is difficult to control the thickness of the metal vapor deposition film. Because it is difficult to make a film, there are large variations in the transparent density, or as the film thickness becomes thinner, the transparency effect improves, but at the same time, the heat ray blocking effect decreases significantly and the original effect as a heat ray reflective sheet or sunshade sheet is lost. I'll get lost. On the other hand, if the thickness of the metal vapor deposited film is increased, the blocking effect increases, but the see-through effect is impaired.At the same time, the reflection effect of the metal increases, causing the reflected light to become significant and the shine to increase, causing problems in the traffic environment, for example. There are some drawbacks.

In view of the current situation, the inventors of the present invention have conducted various studies to improve the various drawbacks of these conventional products, and as a result of repeated efforts, they have found that if a metallic reflective film with a matte surface and a dot shape is used, it will be possible to see through. We learned that it is possible to obtain a heat ray reflective sheet that is possible and has an excellent heat ray blocking effect, and based on this knowledge, we completed the present invention.

That is, the present invention has a transparent base substrate 1 having a matte layer 2 on one side, and a metal thin film layer 3 on the matte layer 2 surface.
Then, after forming a matte ink layer 4 in a halftone dot shape on the surface, the metal thin film layer other than the part pressed by the matte ink layer 4 is removed by etching, and the surface is smoothed over the entire surface. This is a heat ray reflecting sheet that can be seen through, and is characterized in that a transparent coating layer 5 is provided to make the sheet transparent or semi-transparent.

Next, the present invention will be explained in detail based on the drawings.

Suitable materials for the transparent base sheet 1 of the present invention include plastic sheets with good transparency, such as polyester film, polypropylene film, nylon film, polyethylene film, vinyl chloride film, acetate film, and polycarbonate film, as well as other transparent plastic sheets. Plates, transparent glass plates, and transparent colored products of these can also be used.

A matte layer 2 is provided on one side of such a base sheet 1. To form this matte layer 2, for example, coating with a paint in which transparent pigments or highly transparent fine particles such as silica, alumina, glass powder, etc. are dispersed with addition of a transparent colorant if necessary, or coating with a polishing machine. The surface of the sheet may be physically roughened by sandblasting, liquid honing, etc., or chemical methods such as etching, or press processing using a mold may be used. It is desirable to form a finely uneven surface with a surface roughness of about 10μ.

Next, a metal thin film layer 3 is provided on the entire surface of this matte layer 2, but in order to form this metal thin film layer 3,
For example, in addition to various plating methods such as vacuum deposition, sputtering, ion plating, and chemical plating, metal foil may also be attached.

As the metal used here, metals with high heat ray reflectivity such as aluminum, silver, tin, nickel, chromium, etc. are suitable, and it is necessary to form a film made of these metals with a thickness of at least 0.05 microns.
This is because when the film thickness is less than 0.05 microns, the transmission of heat rays increases and no reflection effect can be obtained.

The surface of the metal thin film layer 3 thus formed is coated with a uniform halftone dot shape or A matte ink layer 4 is provided on a halftone gradation pattern in which the size of halftone dots is continuously changed (Fig. 1-A).
reference). As for the size of the halftone dots provided here, a halftone screen of, for example, 600 lines/inch to 80 lines/inch can be applied, but it is usually 200 lines/inch to 80 lines/inch from the viewpoint of printing technology and beautiful finish. 100 lines/inch is optimal, and the area ratio of the halftone dots on the printed surface ranges from 80% to 20%, and among them, 60% to 40% is optimal. be. Further, this matte ink layer may be optionally colored.

Next, the sheet on which the matte ink layer 4 in the form of dots is applied to the surface of the metal thin film layer 3 is treated with an alkaline or acidic chemical cleaning solution (corrosive solution) appropriately selected depending on the type of metal of the metal thin film layer. The exposed portions of the metal thin film layer other than the portions covered by the matte ink layer 4 are dissolved and removed by dipping or shower cleaning (etching) (see FIG. 1-B).

Thereafter, either a transparent resin solution is applied to the entire surface and dried as shown in FIG. 2, or a transparent film 5b is attached via a transparent adhesive layer 5a as shown in FIG. When the transparent coating layer 5 is provided, the area where the metal thin film layer has been removed is filled with the transparent coating layer 5 and the surface becomes smooth, so that area becomes completely transparent, and the entire surface of the transparent area is covered. Due to the uniform distribution, a heat ray reflective sheet can be obtained in which the entire sheet is extremely transparent.

Further, as shown in FIG. 4, the transparent film 5b
A semi-transparent reflective film 5c made of a semi-transparent film, for example a semi-transparent vapor deposited film of metal, is applied over the entire surface in advance.
is provided, and the transparent adhesive layer 5 is placed with the surface facing inside.
The transparent coating layer 5 can also be formed by adhering and integrating with a. In this case, although the transparency decreases to some extent, a large heat ray reflection effect can be obtained.

The present invention has the above-mentioned configuration, and is convenient because the amount of reflection of heat rays, transparency, etc. can be selectively adjusted depending on the size of printing halftone dots, density (area occupied by halftone dots), etc. Therefore, there is no need to worry about the difficulty of controlling the film thickness or the occurrence of film thickness unevenness, which is the problem with conventional translucent metal vapor deposition films, and it is also possible to easily create continuous-tone blurred patterns by continuously changing the density of halftone dots. In addition, since both the front and back surfaces of the dot-like metal vapor layer are matte, it can be used as a heat ray reflective sheet that is extremely suitable from the viewpoint of the traffic environment as well as the transparency effect, for example, on automobile windshields, window glasses, etc. It has great practical value as it can be widely used for glass doors, blinds, various sunshade sheets, etc.

[Brief explanation of the drawing]

FIG. 1 is an enlarged cross-sectional view for explaining the process of an example of implementing the present invention, and FIG. A is a metal thin film layer 3.
Figure B shows the state up to the stage where a matte ink layer 4 is provided in the form of dots on the surface, and Figure B shows the state of Figure A after cleaning with a chemical cleaning solution. Fig. 2 is an enlarged cross-sectional explanatory view of the present invention completed by forming the above-mentioned Fig. 1B and then providing a transparent coating layer 5 thereon, and Fig. 3 shows a transparent coating layer formed by pasting a transparent film 5b. FIG. 4 shows a case where a reflective film 5c is provided on the transparent film 5b of FIG. 3. DESCRIPTION OF SYMBOLS 1...Base substrate, 2...Matte layer, 3...Metal thin film layer, 4...Matte ink layer, 5...Transparent coating layer, 5a...Transparent adhesive layer, 5b...Transparent film, 5c ...Semi-transparent reflective film.

Claims (1)

[Claims for Utility Model Registration] (1) A transparent base substrate 1 having a matte layer 2 on one side, a metal thin film layer 3 provided on the matte layer 2 surface,
Next, after forming a matte ink layer 4 in a halftone dot shape on the surface, the matte ink layer 4 is etched.
A transparent or semi-transparent sheet is obtained by removing the metal thin film layer other than the part pressed by the metal thin film layer and further providing a transparent coating layer 5 on the entire surface so that the surface is smooth. reflective sheet. (2) The see-through heat ray reflective sheet according to claim 1, wherein the matte layer 2 and the matte ink layer 4 are colored in the same color or in different colors. (3) The see-through heat ray reflective sheet according to claim 1, wherein the transparent coating layer 5 is a layer formed by integrally adhering a transparent film 5b with a transparent adhesive layer 5a. (4) The see-through heat ray reflective sheet according to claim 1, wherein the transparent coating layer 5 is a layer having a semi-transparent reflective film 5c. (5) The see-through heat ray reflective sheet according to claim 1, wherein the matte ink layer 4 has a continuous tone pattern consisting of halftone dots of different sizes.