JP2015191002A - Reflective sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflective sheet which reflects light rays or heat rays using a multilayer sheet that includes a layer containing a highly reflective pigment, such as titanium oxide, and aluminum metal vapor deposition layer having a high reflectance, and which prevents separation at the vapor deposition layer from extending.SOLUTION: A reflective sheet of the present invention comprises; a cloth fabric woven with a vapor deposition film, having an aluminum vapor deposition layer on one surface and slitted in one direction, and a transparent film slitted in a direction perpendicular to the one direction; and a white film having reflectivity. They are laminated together directly or with a ramie material in between in such a way that a vapor deposited surface of the vapor deposition film of the cloth fabric faces inward.

Description

  The present invention relates to a reflective sheet.

  A reflective sheet is a sheet that reflects sunlight or light rays or heat rays from the ground surface, and is used for tents and agriculture.

  Patent Document 1 describes obtaining a sheet that reflects heat rays and shields light from a multilayer sheet of a layer containing a highly reflective pigment such as titanium oxide and a metal layer such as aluminum having a high reflectance. . And when a metal layer is a vapor deposition layer, laminating | stacking the resin layer containing a highly reflective pigment with the adhesive agent on the vapor deposition surface of a metal vapor deposition film is described.

Japanese Patent Laid-Open No. 3-248840

  By the way, like the reflective sheet of patent document 1, aluminum with high reflectivity is used as a metal vapor deposition layer (hereinafter also referred to as vapor deposition layer) of a metal vapor deposition film, and a highly reflective pigment such as titanium oxide is contained on the vapor deposition surface. When the resin layer is laminated with an adhesive or the like, the aluminum vapor deposition layer on which the metal vapor deposition film is vapor deposited may not be tightly adhered to the vapor deposited film, and between the vapor deposition layer and the vapor deposited film. Since the film thickness of the deposited aluminum is very thin, the deposited aluminum film in the peeled portion corrodes, and the resin layer containing the highly reflective pigment and the film of the metal deposited film are between In some cases, peeling at a large area proceeds.

  The present invention has been made in order to solve the above-described problems. Light rays or heat rays are produced by a multilayer sheet including a resin layer containing a highly reflective pigment such as titanium oxide and a highly reflective aluminum metal vapor-deposited layer. In the case of obtaining a reflection sheet to be reflected, an object is to obtain a reflection sheet that stops the expansion of peeling between a resin layer containing a highly reflective pigment and a metal vapor deposited film.

The present invention provides the following reflection sheet in order to solve the above-mentioned problems.
(1) A cloth cloth woven with a vapor deposition film provided with an aluminum vapor deposition layer on one side and slit in one direction and a transparent film slit in a direction perpendicular thereto, and a white film having reflectivity are deposited on the cloth cloth. A reflective sheet characterized by being laminated with the white film directly or via a laminated material with the film deposition surface facing inward.
(2) The reflective sheet according to (1), wherein a protective layer is provided on the vapor deposition surface of the vapor deposition film.
(3) The reflective sheet according to (1) or (2), wherein an inorganic powder having a humidity control function is added to the white film, and is directly bonded to the cloth cloth.

In the case of obtaining a reflective sheet that reflects light rays or heat rays by a multilayer sheet including a highly reflective resin layer and an aluminum vapor deposition layer, the vapor deposition film having the aluminum vapor deposition layer is slit, and therefore contains a highly reflective pigment. It is possible to obtain a reflection sheet that stops the expansion of the separation of the reflection sheet between the resin layer and the metal vapor deposition film.

The reflection sheet of this invention is shown. Sectional drawing of another reflection sheet of this invention is shown. Sectional drawing of another reflection sheet of this invention is shown. Sectional drawing of another reflection sheet of this invention is shown. Sectional drawing of another reflection sheet of this invention is shown.

The vapor deposition film described in the present invention has aluminum metal provided on one side of the film by vapor deposition. The film thickness of the vapor deposition film is about 10 μm to 100 μm, and the thickness of the vapor deposition layer of the vapor deposition film is about 10 Å to 1000 Å. Things can be used.
As the film of this vapor deposition film, a transparent plastic film excellent in continuous film-forming properties such as polyolefin, polyester, polyamide, polycarbonate, acrylic resin can be used.
In particular, a uniaxially or biaxially oriented film is preferable because it has excellent properties such as dimensional stability, mechanical properties, heat resistance, transparency, and electrical properties. Further, if necessary, other particles such as kaolin, talc, silicon dioxide, calcium carbonate, titanium dioxide, zeolite, aluminum oxide and the like may be blended in a small amount without departing from the spirit of the present invention. In addition, a weathering agent, an antistatic agent, a lubricant, an antioxidant and the like may be blended.
Further, in order to improve the deposition adhesion of the film, for example, a surface activation method for performing surface corona discharge treatment, ultraviolet irradiation treatment, plasma treatment, etc., a surface etching method using a chemical such as an acid, alkali, or aqueous amine solution, or Various kinds of resin such as acrylic resin, polyester resin, urethane resin, and polyolefin resin having adhesiveness may be provided on the film surface as a primer layer.

  The protective layer described in the present invention is a layer for improving the corrosion resistance and oxidation resistance of aluminum metal by vapor deposition provided on the film surface, such as acrylic resin, polyester resin, urethane resin, polyolefin resin, silicone resin, fluorine resin, etc. Various resins can be coated with a coating or the like. Moreover, you may coat | cover by the lamination by extrusion with polyethylene etc.

  The cloth cloth described in the present invention is made by weaving a slit deposited film in one direction and a transparent film slit in a direction perpendicular thereto, and usually the transparent film is in the warp direction and the deposited film is in the weft direction. The slit width is about 2 mm to 20 mm. As the transparent film, a transparent plastic used for the vapor deposition film can be used.

The white film described in the present invention is formed by adding white inorganic powder to a resin to form a film, coating a paste obtained by adding white inorganic powder to a resin, and forming a void on the film. Including As the void-forming substance, white inorganic powder, organic powder, or incompatible resin is used, and a plurality of voids are formed inside by stretching, and the method using incompatible resin is not the same as the main resin. A compatible thermoplastic resin is contained. The film thickness of the white film can be about 10 μm to 100 μm.
In terms of light resistance of the white film, it is preferable that an ultraviolet absorber and a light stabilizer are included. As the ultraviolet absorber, benzotriazole, benzophenone, or the like can be used. A hindered amine or the like can be used as the light stabilizer.

As the white inorganic powder of the white film, for example, particles such as barium sulfate, titanium dioxide, silicon dioxide, calcium carbonate and the like can be used. The white inorganic powder may have any particle shape, for example, a plate shape or a spherical shape. The white inorganic powder may be surface-treated in order to improve dispersibility. In particular, if you want to add humidity control function, choose from aluminum hydroxide, calcium carbonate, silica gel, activated clay, zeolite, calcium oxide, calcium chloride, zinc oxide, barium titanate, magnesium sulfate, aluminum oxide, alumite, etc. be able to. In particular, calcium carbonate is preferable in terms of cost.
The average particle size of the white inorganic powder is preferably 0.1 to 3.0 μm, more preferably 0.2 to 2.5 μm, and particularly preferably 0.3 to 2.0 μm. By using a powder having an average particle diameter in this range, it is possible to appropriately disperse in the resin, and it is difficult for the powder to agglomerate and a light reflecting layer having no coarse protrusion on the surface can be obtained. At the same time, the surface of the light reflecting layer can have an appropriate range of glossiness.

  Examples of organic powders include polyester resin particles, polyamide resin particles such as benzoguanamine, polyurethane resins, acrylic resins, methacrylic resins, polyamide resins, polyethylene resins, polypropylene resins, polyvinyl chloride resins, polyvinylidene chloride resins, polystyrene resins. , Polyvinyl acetate resin, fluorine-based resin, silicone resin particles, hollow particles thereof, and the like. These resins may be used alone, or two or more copolymers or a mixture thereof may be used.

  The laminar material described in the present invention is a material for laminating the materials to be laminated, and a paste obtained by softening and melting a thermoplastic resin such as an adhesive, heat-melted polyethylene, ethylene-olefin copolymer or the like can be used.

The laminate described in the present invention is a laminate such as a dry laminate, an extruded laminate, a hot melt laminate, a thermal laminate, etc. by being bonded with a white film directly or through a laminated material with the vapor deposition surface of the vapor deposition film on the inside. A method is available. In addition to a method of using an adhesive such as a solution, hot melt, or melted polyethylene as a laminating material, a method of applying pressure without applying a laminating material such as a thermal laminate can be used.
Moreover, the method of adding the inorganic powder which has a humidity control function to a white film, and sticking it directly on cloth cloth is this thermal laminating method, and can make a white film function a humidity control function effectively.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a reflection sheet of the present invention. 1A is a top view and FIG. 1B is a cross-sectional view. Aluminum cloth is vapor-deposited on one side, a vapor deposition layer 1a is provided, and a cloth cloth 3 woven with a vapor deposition film 1 slit in one direction, a transparent film 2 slit in a direction perpendicular thereto, and a white film 4 having reflectivity. The reflective sheet laminated | stacked through the white film 4 and the laminated material 5 by making the vapor deposition surface of the vapor deposition film 1 of the cloth cloth 3 into an inner side is shown. A white film 4 in FIG. 1 shows a case where a white inorganic powder is added to a resin to form a film.

  The reflective sheet of the present invention is not particularly limited in the orientation of the white film 4 side and the cloth cloth 3 side in the method of use, and either side may be on the ground surface side, but the corrosion resistance of the aluminum metal for vapor deposition of the vapor deposition film 1 In terms of oxidation resistance, the cloth cloth 3 side should be the ground surface side. When the white film 4 side is set to the ground surface side, sunlight is reflected by the white film 4 and light passes through the vapor deposition layer 1a twice, so that deterioration of the aluminum metal may be accelerated.

FIG. 2 shows a cross-sectional view of another reflecting sheet of the present invention.
The difference from FIG. 1 is that instead of adding a white inorganic powder to a resin as a white film 4, a coating layer 4 b is provided by coating the base film 4 a with a paste obtained by adding a white inorganic powder to a resin. This is a point indicating a case. The method of providing the coating layer 4b is preferable in that the variation in the strength of the reflection sheet is improved because the variation in the product strength of the base film 4a is small.

FIG. 3 shows a cross-sectional view of another reflecting sheet of the present invention.
The difference from FIGS. 1 and 2 is that the thermal laminate is bonded with heat without using a laminated material. In this case, in particular, it may be better to improve the releasability by laminating the surface of the thermocompression roller at the time of lamination. As white film 4, when white inorganic powder is added to resin to form a film, when paste with resin added with white inorganic powder is coated on the film surface, the film is whitened by forming voids It can be used without any particular limitation, but the surface of the thermocompression roller can be fluorinated at the time of lamination by substituting the coating material with a laminating material, as in the case of coating a paste with white inorganic powder added to the resin on the film surface. There are cases where it is not necessary to improve the peelability by resin processing or the like.

FIG. 4 shows a cross-sectional view of another reflective sheet of the present invention. FIG. 4A shows a case where the laminated material 5 is present, and FIG. 4B shows a case where the laminated material 5 is not present.
The difference from FIGS. 1 to 3 is that a protective layer 1 b is provided on the surface of the vapor deposition layer 1 a of the vapor deposition film 1. By providing the protective layer 1b, the corrosion resistance and oxidation resistance of the aluminum deposited metal can be improved.

FIG. 5 shows a cross-sectional view of another reflective sheet of the present invention. 5A shows a case where the protective layer 1b is not present on the surface of the vapor deposition layer 1a of the vapor deposition film 1, and FIG. 5B shows a case where the protective layer 1b is present.
The difference from FIGS. 1 to 4 is that a white film 4 is added with an inorganic powder 4c having a humidity control function to form a film and is directly bonded to the cloth 3. By doing so, moisture is easily transmitted through the reflection sheet.

  DESCRIPTION OF SYMBOLS 1 ... Deposition film, 1a ... Deposition layer, 1b ... Protective layer, 2 ... Transparent film, 3 ... Cross cloth, 4 ... White film, 4a ... Base film, 4b ... Coating layer, 4c ... Inorganic powder which has humidity control function 5 ... Laminated wood

Claims (3)

  A cloth cloth woven with a vapor deposition film provided with an aluminum vapor deposition layer on one side and slit in one direction and a transparent film slit in a direction perpendicular to the vapor deposition film, and a reflective white film are deposited on the cloth vapor deposition film. A reflective sheet, which is laminated with the white film directly or via a laminated material with the surface inside.   The reflective sheet according to claim 1, wherein a protective layer is provided on a vapor deposition surface of the vapor deposition film.   The reflective sheet according to claim 1 or 2, wherein an inorganic powder having a humidity control function is added to the white film, and the white film is directly bonded to the cloth cloth.

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