JPH05196195A - Vacuum insulation panel - Google Patents

Abstract

PURPOSE:To greatly reduce the heat conduction in the circumferential edge part of a sealed bag by forming either of a front surface member and a rear surface member by a metallic oil composite plastic film and the other by a vapor-deposited metallic layer composite plastic film. CONSTITUTION:A front surface member 1 is constituted by laminating a sealant layer 5 on a front surface layer 3 where a vapor-deposited metalliclayer 2 is layer 2 is formed by vapor-depositing the metal of aluminum or the like on the front surface layer 3 by the known method. The rear surface member 6 is constituted by laminating the front surface layer 10 and the sealant layer 11 on both sides of a metallic foil 7 through the respective adhesive layers 8, 9. In particular, either of the front surface member 1 and the rear surface member 6 is formed by a metallic foil composite plastic film, and at the same time, the other is formed by a vapor-deposited metallic layer composite plastic film. Thus, the vacuum insulation panel reduces the thermal conduction at the circumferential edge part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum heat insulation panel in which a heat insulation material is vacuum-filled in a sealed bag composed of a front material and a back material, and more specifically, gas is introduced into the vacuum heat insulation panel from the outside. Prevents intrusion and reflects heat,
The present invention relates to a vacuum heat insulation panel in which heat is hard to be conducted along the outer surface.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
As a vacuum heat insulating panel, as disclosed in Japanese Patent Application Laid-Open No. 58-50394 (a method for manufacturing a heat insulating plate), a breathable packaging bag is filled with powder, and this is packaged with a front material and a back material. A method of manufacturing a heat-insulating panel by placing it in a bag and sealing it in a vacuum state is disclosed.However, if the surface material and the back surface material of this outer bag are made of only plastic, gas enters from the surface of the outer bag. However, there is a problem that the degree of vacuum deteriorates (the thermal conductivity deteriorates), and if metal foil is laminated on the front surface material and the back surface material in order to prevent gas intrusion, the peripheral edge of the heat insulation panel However, there is a problem in that heat conduction is caused and the heat insulation performance is deteriorated.

For this reason, the applicant of the present invention previously disclosed in Japanese Patent Laid-Open No. 62-
As described in Japanese Patent No. 39455 (Packaging bag manufacturing method), an adhesion-inhibiting layer that inhibits adhesion of a metal foil is formed in a heat-bonding planned portion or a heat-bonded portion of an outer bag, and the metal foil in that portion is cut. Then, a method of removing the metal has been proposed, but this manufacturing method has a difficulty in mass production because the process is complicated.

The present invention has been made in view of the above circumstances.
It is an object of the present invention to provide a vacuum heat insulating panel which can be easily manufactured without problems in the manufacturing method and is excellent in high air-proof property and heat conduction preventing property.

[0005]

In order to achieve the above object, the present invention provides a vacuum heat insulating panel in which a heat insulating material is vacuum filled in a sealed bag made of a surface material and a back surface material. Either one of them is formed of a metal foil composite plastic film and the other is formed of a metal vapor deposition layer composite plastic film, or both of the surface material and the back surface material are formed of a metal vapor deposition layer composite plastic film. The present invention provides a vacuum heat insulating panel characterized by the above.

[0006]

According to the present invention, by forming either the front surface material or the back surface material with the metal foil composite plastic film and the other with the metal vapor deposition layer composite plastic film,
A vacuum insulation panel having very little thermal conduction in the peripheral portion of the sealed bag can be obtained.

It is not always clear why the use of the metal-deposited-layer composite plastic film reduces the thermal conduction at the peripheral portion of the sealing bag, but the metal-deposited layer is thin and is practically not used. This is probably because the continuous film was not formed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG. In the figure, 1 is a surface material, and this surface material 1 is
The sealant layer 5 is laminated on the surface layer 3 having the metal vapor deposition layer 2 formed on the inner surface with the adhesive layer 4 interposed therebetween. Here, the metal deposition layer 2 can be formed by depositing a metal such as aluminum on the surface layer 3 by a known method. The metal vapor deposition layer 2 preferably has a thickness of 300 to 1000A, particularly 500 to 800A. A film having heat resistance such as polyester, polyamide and polypropylene is used as the surface layer 3, and the thickness thereof can be usually 5 to 40 μm. The surface layer 3 may be a single layer or a composite layer of these plastic films. The sealant layer 5 is made of polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyacrylonitrile or the like and has a thickness of 15 to 3
Although it can be formed to a thickness of about 00 μm, in particular, when chlorofluorocarbon is used as a foaming agent in the production of the air-proof property and the filler described later,
Polyacrylonitrile is preferable from the viewpoint of resistance to residual CFC gas. In order to bond the surface layer 3 and the sealant layer 5, known adhesives such as urethane adhesives and isocyanate adhesives can be used.

Reference numeral 6 denotes a back surface material, and the back surface material 6 is provided on both surfaces of the metal foil 7 with adhesive layers 8 and 9 respectively on the surface layer 1.
0 and the sealant layer 11 are laminated. In this case, the surface layer 10 and the sealant layer 11 can be formed of the same material as the surface layer 3 and the sealant layer 5 of the surface material 1 to have the same thickness. Here, as the metal foil 7, the same metal as the metal vapor deposition layer 2 can be used, but aluminum is particularly preferable. The thickness of this metal foil 7 is 3 to 50 μm,
It is particularly preferable that the thickness is 5 to 20 μm.

Reference numeral 12 designates a heat insulating material, which is made of perlite, white carbon, expanded polystyrene, sintered polyethylene or the like, which is housed in a breathable bag. Further, a urethane foam block or the like can also be used. Of these, sintered polyethylene has a smaller thermal conductivity than pearlite or white carbon (sintered polyethylene:
λ = 0.003, perlite, white carbon: λ =
0.007) In addition, ordinary foamable polyethylene is not suitable as a heat insulating material because it collapses cells under vacuum, but this sintered polyethylene is hard and has continuous cells, so even under vacuum It is not crushed and is particularly suitable as a heat insulating material.

In the vacuum heat insulation panel according to the embodiment shown in FIG. 1, the four circumferences of the sealant layer 5 of the front surface material 1 and the four circumferences of the sealant layer 11 of the back surface material 6 are heat-bonded 13 and 13 to each other to form a sealed bag 14. In addition, the heat insulating material 12 is vacuum filled in the sealed bag 14.

In this case, the heat-bonded portions 13, 13 of the four edges of the front surface material 1 and the four edges of the back surface material 6 are close to each other, and if the front surface material and the back surface material are metal foil laminated films,
Although considerable thermal conduction occurs in the heat-bonded portions 13, 13, the surface material 1 is a metal vapor deposition film and the back material 6 is a metal foil laminated film.
In No. 3, thermal conduction hardly occurs.

Contrary to the embodiment of FIG. 1, the surface material 1 may be a metal foil laminated film and the back surface material 6 may be a metal vapor deposition layer film.

Further, in the embodiment of FIG. 1, the metal foil 7 of the back surface material 6 may be a metal vapor deposition layer, and both the front surface material 1 and the back surface material 6 may be metal vapor deposition layer films.

Further, the metal foil composite plastic film 15 having the structure shown in FIG. 2 is attached to the outer surface or the inner surface of the surface material 1 other than the heat-bonded portions 13, 13 as shown in FIGS. , Which results in a vacuum insulation panel with better heat reflectivity. This film 15
A surface layer 19 and a sealant layer 20 are laminated on both surfaces of a metal foil 16 such as aluminum with adhesive layers 17 and 18 interposed therebetween. The surface layer 19 and the sealant layer 20 are the surface layers 3 and 10 and the sealant layers 5 and 11, respectively.
It can be formed to the same thickness with the same material as the above, but in this case, the sealant layer 20 is graft-modified with silane, especially when a film having heat adhesiveness such as polyester or nylon is used as the surface material 1. The ethylene-ethyl acrylate copolymer resin described above is suitable.

The metal foil composite plastic film 1
5 may be heat-bonded to the outer surface or the inner surface of the heated surface material over the entire surface or only the four circumferences. In this case, it is recommended to adhere the four peripheries to the outer surface or inner surface of the surface material having perforations within the range where the metal foil composite plastic film is attached. When the surface material having the above-mentioned perforations is used, the hole diameter of the perforations is preferably 1 to 30 mm, particularly preferably 5 to 20 mm, and the density of the perforations is 1 to 20 pieces / 10 cm.
² and particularly preferably ² to 5 pieces / 10 cm ² .

Next, the effect of the vacuum heat insulating panel of the present invention will be shown by an experimental example. [Experimental Example 1] Composition of surface material Surface layer: polyester film vapor-deposited with aluminum, 12 mm sealant layer: acrylonitrile film (Zeklon film, manufactured by Mitsui Toatsu Chemicals, Inc.), 50 μm adhesive layer: urethane adhesive, 2 μm back surface configuration surface layer of wood: a polyester film, 25 mm sealant layer: acrylonitrile film (same as above), 5
0 μm adhesive layer: urethane-based adhesive metal foil composite plastic film constituting surface layer: polyester film, 12 μm adhesive layer: urethane-based adhesive metal foil: aluminum, 10 μm sealant layer: silane graft-modified ethylene-ethyl acrylate Polymerized resin, 50 μm (laminated by melt extrusion laminating method) Dimension: 400 mm x 400 mm Heat insulation foam urethane resin, thickness 15 mm Using the above materials, a vacuum heat insulation panel (420 mm x 440 mm) having the configuration shown in Fig. 3 above is manufactured. did.

Table 1 shows the changes over time in the degree of vacuum and the thermal conductivity of this vacuum heat insulating panel. Further, the vacuum heat insulating panel in which the metal foil composite plastic film is attached to the inner surface of the surface material shown in FIG. 4 also showed the same effect. The methods for measuring the degree of vacuum and the thermal conductivity are as follows. Vacuum degree 1 × 10 ^-2 Torr Thermal conductivity λ = 0.003 kcal / m · hr · ° C

[Experimental Example 2] In the surface material of Experimental Example 1,
A similar vacuum heat insulating panel was produced in the same manner as in Experimental Example 1 except that a metal foil composite plastic film having holes with a hole diameter of 10 mm and a density of 2 holes / 10 cm ² was used within the same range. The measurement was performed. The results are also shown in Table 1.

[0020]

[Table 1]

[0021]

The vacuum heat insulating panel of the present invention has very little thermal conduction in the peripheral portion.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an example of a metal foil composite plastic film.

FIG. 3 is a sectional view showing another embodiment of the present invention.

FIG. 4 is a sectional view showing still another embodiment of the present invention.

[Explanation of symbols]

 1 Surface Material 2 Metal Vapor Deposition Layer 6 Back Material 7 Metal Foil 12 Heat Insulation Material 13 Thermal Adhesive Part 14 Sealing Bag

Claims (2)

[Claims] 1. A vacuum heat insulation panel in which a heat insulating material is vacuum-filled in a hermetically sealed bag made of a front material and a back material, wherein either the front material or the back material is formed of a metal foil composite plastic film. A vacuum heat insulation panel, characterized in that the other is formed by a metal deposition layer composite plastic film. 2. A vacuum heat insulation panel in which a heat insulating material is vacuum-filled in a hermetically sealed bag made of a front material and a back material, wherein both the front material and the back material are formed of a metal deposition layer composite plastic film. A vacuum insulation panel characterized by that.