JPH11201376A - Vacuum insulation panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum panel excellent in heat insulation manufacturing method and stable in quality by providing a core consisting of a sheet-like material easy to emit the gas, and formed into a structure strong against the stress in the thickness direction of a vacuum heat insulation panel to be used for a heat insulation box such as a refrigerator. SOLUTION: A core 2 consisting of a corrugated cardboard is of the shape where a plurality of rectangles are continuously connected in one direction when viewed in the thickness direction of a vacuum heat insulation panel 1, and of the structure having the prescribed thickness in the thickness direction of the vacuum heat insulation panel 1. The core 2 is packaged by a packaging film 3 which is formed by successively laminating a polymer resin layer 4, a gas barrier layer 6, and a thermoplastic resin layer 5, and attaching them to each other. The core 2 is inserted between two packaging films 3 whose outermost peripheral part on three sides is thermo-compressed, the inside of a manufacturing apparatus is evacuated, and the rest of the outermost peripheral part is thermo-compressed to obtain the vacuum heat insulation panel 1 in which the heat insulation performance is excellent, and the inside of the packaging film 3 is of the desired degree of vacuum in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum heat insulating panel used as a heat insulating material for a heat insulating box such as a refrigerator.

[0002]

2. Description of the Related Art FIG. 12 is a cross-sectional view showing the structure of the vacuum heat insulating panel of Conventional Example 1. FIG. 12 shows a case where a vacuum insulation panel is provided on an exterior panel of a refrigerator. FIG. 13 is an enlarged sectional view showing the vacuum heat insulating panel of Conventional Example 1 shown in FIG. 12 and 13, reference numeral 101 denotes a vacuum heat insulating panel, 102 denotes a core material having a heat insulating property formed by foaming polyurethane to form a panel shape,
103 is a packaging film for packaging and sealing the core material 102.

In the packaging film 103, 104 is a polymer resin layer of polyethylene terephthalate provided on the outermost side, 105 is a thermoplastic resin layer provided on the core 102 side, and 106 is a polymer resin layer 104 and thermoplastic resin. This is a gas barrier layer provided between the resin layer 105 and made of aluminum, which has extremely low air permeability and blocks the entry of gas from the outside.

[0004] Further, reference numeral 107 denotes an exterior panel of the refrigerator;
8 is a refrigerator interior panel, 109 is a vacuum insulation panel 10
1 is a double-sided tape attached to the exterior panel 107, and 110 is a filler such as polyurethane filled in a gap between the exterior panel 107 and the interior panel 108.

As described above, the vacuum insulation panel 1 of the conventional example 1
In No. 01, the core material 1 is made of a foamed resin made of polyurethane.
No. 02, and carbon dioxide gas having a high thermal conductivity generated during foaming is confined inside the core material 102 as bubbles.

Conventional example 2. FIG. 14 shows, for example,
It is sectional drawing which shows the structure of the vacuum heat insulation panel of the prior art example 2 shown by 204093. In FIG. 14, 111
Numeral denotes a vacuum heat insulating panel, 112 denotes a core material formed by stacking the used papers alternately by folding them back in different directions, and 113 denotes a packaging film for packaging and sealing the core material 112.

As described above, the vacuum insulation panel 1 of the conventional example 2
In 11, the waste paper is alternately folded in different directions so as to be stacked so as to overlap with each other.
12.

[0008]

Since the vacuum insulation panel of the prior art 1 is configured as described above, carbon dioxide having high thermal conductivity is trapped as bubbles in the core material. As a result, there is a problem that the heat insulating performance of the vacuum heat insulating panel is reduced.

As a method of solving this problem, a core material is
In some cases, a foamed resin having so-called open cells, in which bubbles are communicated, is used. In this case, however, the cost of the core material is high, so that there is a problem that the price of the vacuum heat insulating panel is high.

Further, since the vacuum heat insulating panel according to Conventional Example 2 is configured as described above, when the core material is sealed with the packaging film, the core material is compressed in the thickness direction of the vacuum heat insulating panel. For this reason, the discharge of gas existing between the used paper and the used paper is prevented, or the gas remains between the used paper and the used paper. As a result, a problem that it takes a long time to bring the inside of the packaging film to a desired degree of vacuum, and a problem that the degree of vacuum is reduced due to release of residual gas after packaging and the heat insulation performance of the vacuum insulation panel is reduced. was there.

Further, in the vacuum insulation panel according to Conventional Example 1 and Conventional Example 2, particularly, Conventional Example 2, the core material is weak against compressive stress and bending stress in the thickness direction of the vacuum thermal insulation panel. For this reason, when the filler to be filled after the vacuum insulation panel is disposed on the exterior panel of the refrigerator is cured, the filler expands and compressive stress and bending stress are applied in the thickness direction of the vacuum insulation panel, and the core is hardened. The material is deformed. As a result, there is a problem that the heat insulating performance of the vacuum heat insulating panel is unstable.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to obtain a stable vacuum heat insulating panel having high heat insulating performance.

Another object of the present invention is to provide a vacuum insulation panel capable of reducing the inside of the packaging film to a desired degree of vacuum in a short time when the core is sealed with the packaging film.

Another object of the present invention is to obtain a low-cost vacuum insulation panel.

[0015]

A vacuum heat insulating panel according to the present invention has a structure in which a core material is formed of a sheet-like material from which gas can be easily released, and which is strong against stress in a thickness direction of the vacuum heat insulating panel. It was done.

The vacuum insulation panel according to the present invention has a shape in which a plurality of rectangles are continuously connected in one direction when the core material is viewed from the thickness direction of the vacuum insulation panel. The structure has a predetermined thickness in the direction.

In the vacuum heat insulating panel according to the present invention, the core material has a shape in which a plurality of hexagons are closely connected when viewed from the thickness direction of the vacuum heat insulating panel, and the core material has a predetermined shape in the thickness direction of the vacuum heat insulating panel. This is a structure having a thickness of

In the vacuum heat insulating panel according to the present invention, when the core material is viewed from the thickness direction of the vacuum heat insulating panel, the core material has a shape in which a plurality of rectangles are closely connected to each other and has a predetermined shape in the thickness direction of the vacuum heat insulating panel. This is a structure having a thickness.

The vacuum heat insulating panel according to the present invention has a core material having a wavy structure.

The vacuum heat insulating panel according to the present invention has a structure in which the core member has a corrugated member disposed on both sides of a plate member.

In the vacuum heat insulating panel according to the present invention, the sheet material constituting the core material is cardboard or cardboard.

In the vacuum heat insulating panel according to the present invention, the sheet material constituting the core material has a low emissivity.

The vacuum heat insulating panel according to the present invention comprises a sheet-like material constituting a core and a low emissivity layer having a low emissivity on the surface.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is an exploded perspective view showing a vacuum heat insulating panel according to Embodiment 1 of the present invention. FIG. 2 is a perspective view showing a core material of the vacuum heat insulating panel according to Embodiment 1 of the present invention. 1 and 2, 1 is a vacuum heat insulating panel, 2 is a core material having heat insulating performance, and 3 is a packaging film for packaging and sealing the core material 2.

In the packaging film 3, 4 is a polymer resin layer made of polyethylene terephthalate provided on the outermost side, 5 is a thermoplastic resin layer provided on the core material 2 side, and 6 is a polymer resin layer 4 and a thermoplastic resin layer. This is a gas barrier layer provided between the resin layer 5 and made of aluminum, which has extremely low air permeability and blocks the entry of gas from the outside. The packaging film 3 has a three-layer structure formed by sequentially laminating and bonding a polymer resin layer 4, a gas barrier layer 6, and a thermoplastic resin layer 5 toward the core material 2.

In the vacuum heat insulating panel 1 according to the first embodiment, the core material 2 is made of cardboard. Corrugated cardboard is a sheet-like material, which can easily release gas retained therein, is inexpensive, and has low thermal conductivity.

Further, in the vacuum heat insulating panel 1 according to the first embodiment, the core 2 has a shape in which a plurality of rectangles are continuously connected in one direction when viewed from the thickness direction of the vacuum heat insulating panel 1. The cage has a structure having a predetermined thickness in the thickness direction of the vacuum insulation panel 1. That is, the core material 2 has a strip shape when viewed from the thickness direction of the vacuum heat insulating panel 1 and has a structure having a predetermined thickness in the thickness direction of the vacuum heat insulating panel 1.

Next, a method of manufacturing the vacuum insulation panel 1 will be described. First, the core material 2 is formed. The core member 2 includes two strip-shaped first members 2a and a plurality of strip-shaped second members 2a.
b is cut out to a predetermined size, a plurality of second members 2b are arranged between two first members 2a arranged at a predetermined interval, and a plurality of second members 2b are arranged on the two first members 2a using an adhesive. Second
Is formed by fixing the member 2b.

Thereafter, the two packaging films 3 are arranged with the thermoplastic resin layers 5 facing each other, and the three outermost peripheral portions of the two packaging films 3 are thermocompression-bonded.

Thereafter, the core material 2 is inserted between the two packaging films 3, the inside of the manufacturing apparatus is evacuated, and the other outermost peripheral portion of the remaining two packaging films 3 is thermocompression-bonded.

As described above, according to the first embodiment, since the core 2 is made of cardboard, the core 2
The gas that is retained by itself is easily released. And
When viewed from the thickness direction of the vacuum insulation panel 1, the core material 2 has a shape in which a plurality of rectangles are continuously connected in one direction, and has a predetermined thickness in the thickness direction of the vacuum insulation panel 1. Due to the structure, when the core material 2 is sealed with the packaging film 3, the core material 2 does not compress in the thickness direction of the vacuum heat insulating panel 1, and the gas released from the core material 2 itself is easily discharged.
For this reason, there is an effect that a heat insulating performance is high and a vacuum heat insulating panel that can make the inside of the packaging film 3 a desired degree of vacuum in a short time can be obtained.

Further, since the core 2 is made of cardboard, the cost of the core 2 is low. Therefore, there is an effect that a low-cost vacuum heat insulating panel can be obtained.

Further, when viewed from the thickness direction of the vacuum heat insulating panel 1, the core material 2 has a shape in which a plurality of rectangles are continuously connected in one direction. The thickness of the core material 2 is strong against compressive stress and bending stress in the thickness direction of the vacuum heat insulating panel 1. For this reason, there is an effect that a vacuum heat insulating panel having stable heat insulating performance can be obtained.

When the core is made of cardboard instead of cardboard, the same effects as those obtained by using cardboard can be obtained. When the core is made of foamed resin having open cells instead of corrugated cardboard, the core is made of corrugated cardboard, except that the cost of the core material 2 increases and the price of the vacuum insulation panel rises. The same effect can be obtained.

Further, as shown in FIG. 3, a small hole 2d is provided in the second member 2b of the core member 2, or a notch 2c is provided in the second member 2b of the core member 2 as shown in FIG. Thereby, the gas released from the core material 2 itself can be more easily discharged.

Embodiment 2 FIG. 5 is a perspective view showing a core material of a vacuum heat insulating panel according to Embodiment 2 of the present invention.
FIG. 6 is a plan view showing a core material of a vacuum heat insulating panel according to Embodiment 2 of the present invention. 5 and FIG.
Is a core material having heat insulating performance.

In the vacuum insulation panel according to the second embodiment,
The core material 12 is made of cardboard.

In the vacuum insulation panel according to the second embodiment, the core 12 has a shape in which a plurality of hexagons are closely connected when viewed from the thickness direction of the vacuum insulation panel. The structure has a predetermined thickness in the thickness direction. That is, the core member 12 has a honeycomb shape when viewed from the thickness direction of the vacuum insulation panel, and has a structure having a predetermined thickness in the thickness direction of the vacuum insulation panel.

When the core member 12 having such a structure is formed, first, a plurality of strip-shaped members 12a are cut out to a predetermined size, and each strip-shaped member 12a is connected to the adjacent strip-shaped member 1a.
Fold so as to form a plurality of hexagons when bonded to 2a. Thereafter, the parallel portions 12b of the adjacent strip-shaped members 12a are attached to each other using an adhesive.

As described above, according to the second embodiment, the same effects as in the first embodiment can be obtained.

In the second embodiment, the core 12
When viewed from the thickness direction of the vacuum heat insulating panel, a plurality of hexagons are closely connected and have a structure having a predetermined thickness in the thickness direction of the vacuum heat insulating panel. The core material 12 is more resistant to the compressive stress and bending stress in the thickness direction of the vacuum heat insulating panel than the core material 2 of the vacuum heat insulating panel according to the first embodiment. Further, the core material 12 of the vacuum heat insulating panel according to the second embodiment is the same as that according to the first embodiment.
From the core material 2 of the vacuum heat insulating panel due to the stress in the side direction and the stress in the diagonal direction (the direction connecting the opposite corners when viewed from the thickness direction of the vacuum heat insulating panel).

As described above, the core material 12 of the vacuum heat insulating panel according to the second embodiment is different from the core material 2 of the vacuum heat insulating panel according to the first embodiment in that the stress in the thickness direction of the vacuum heat insulating panel, the stress in the side direction, Since the core material 12 of the vacuum heat insulating panel according to the second embodiment is less resistant to diagonal stress, the core material 12 of the vacuum heat insulating panel according to the first embodiment has less deformation during evacuation, and the core material 12 The gas released from itself is easily discharged. For this reason, according to the second embodiment, it is possible to obtain a vacuum heat insulating panel that has a higher heat insulating performance than the case of the first embodiment and can bring the inside of the packaging film to a desired degree of vacuum in a short time. effective.

Further, the core material 12 of the vacuum insulation panel according to the second embodiment is different from the core material 2 of the vacuum insulation panel according to the first embodiment in that the stress in the thickness direction, the stress in the side direction, and the diagonal direction of the vacuum insulation panel. According to the second embodiment, there is an effect that it is possible to obtain a vacuum heat insulating panel having a more stable heat insulating performance than in the case of the first embodiment, because it is strong against the directional stress.

Embodiment 3 FIG. FIG. 7 is a perspective view showing a core material of a vacuum heat insulating panel according to Embodiment 3 of the present invention.
In FIG. 7, reference numeral 22 denotes a core material having heat insulation performance.

In the vacuum heat insulating panel according to the third embodiment, the core member 22 is made of corrugated cardboard.

In the vacuum insulation panel according to the third embodiment, the core member 22 has a shape in which a plurality of rectangles are closely connected when viewed from the thickness direction of the vacuum insulation panel. The structure has a predetermined thickness in the vertical direction. That is, the core member 22 has a lattice shape when viewed from the thickness direction of the vacuum heat insulating panel, and has a structure having a predetermined thickness in the thickness direction of the vacuum heat insulating panel.

When forming the core member 22 having such a structure, first, a plurality of strip-shaped first members 22a and a plurality of strip-shaped second members 22b are cut out to predetermined sizes. A cut is made at the intersection of the first member 22a other than the first member 22a located on the outer periphery with the second member 22b, and the second member 22b other than the second member 22b located on the outer periphery is cut. A cut is made at the intersection with the first member 22a. Thereafter, the first member 22a and the second member 22 are arranged such that the cut portion of the first member 22a and the cut portion of the second member 22b intersect.
b is arranged. After that, using the adhesive, the first member 2
2a and the second member 22b are fixed at the intersection, the first member 22a located on the outer periphery is fixed to the second member 22b, and the second member 22b located on the outer periphery is fixed to the first member 22.
a.

As described above, according to the third embodiment, the same effects as in the first embodiment can be obtained.

In the third embodiment, the core material 22
When viewed from the thickness direction of the vacuum insulation panel, a plurality of rectangles have a shape closely connected and have a structure having a predetermined thickness in the thickness direction of the vacuum insulation panel. The core material 22 is more resistant to the compressive stress and bending stress in the thickness direction of the vacuum heat insulating panel than the core material 2 of the vacuum heat insulating panel according to the first embodiment. Further, the core material 22 of the vacuum insulation panel according to the third embodiment is the same as that according to the first embodiment.
Than the core material 2 of the vacuum heat insulating panel due to the above-mentioned method, it is more resistant to stress in the side direction.

As described above, the core material 22 of the vacuum heat insulating panel according to the third embodiment is smaller than the core material 2 of the vacuum heat insulating panel according to the first embodiment in the stress in the thickness direction and the stress in the side direction of the vacuum heat insulating panel. Therefore, the core material 22 of the vacuum heat insulating panel according to the third embodiment is less deformed during evacuation than the core material 2 of the vacuum heat insulating panel according to the first embodiment, and the gas released from the core material 22 itself. Is easily discharged. For this reason, according to the third embodiment, it is possible to obtain a vacuum heat insulating panel that has a higher heat insulating performance than the case of the first embodiment and is capable of achieving a desired degree of vacuum inside the packaging film in a short time. effective.

Further, the core material 22 of the vacuum insulation panel according to the third embodiment is more resistant to the stress in the thickness direction and the stress in the side direction of the vacuum insulation panel than the core material 2 of the vacuum insulation panel according to the first embodiment. According to the third embodiment,
There is an effect that a vacuum insulation panel having stable heat insulation performance can be obtained as compared with the case of the first embodiment.

Embodiment 4 FIG. FIG. 8 is a perspective view showing a core material of a vacuum heat insulating panel according to Embodiment 4 of the present invention.
In FIG. 8, reference numeral 32 denotes a core material having heat insulating performance. In the vacuum heat insulating panel according to the fourth embodiment, the core material 32 is constituted by corrugated cardboard.

In the vacuum heat insulating panel according to the fourth embodiment, the core material 32 has a wavy structure. That is, the core material 32 has a corrugated structure.

As described above, according to the fourth embodiment, since the core material 32 is constituted by corrugated cardboard, the gas held in the core material 32 itself is easily released. Since the core 32 has a wavy structure, the core 3
2 is open, so that gas released from the core material 32 itself is easily discharged. For this reason, there is an effect that a heat insulating performance is high and a vacuum heat insulating panel that can make the inside of the packaging film a desired degree of vacuum in a short time can be obtained.

Further, since the core material 32 is made of cardboard, the cost of the core material 32 is low. Therefore, there is an effect that a low-cost vacuum heat insulating panel can be obtained.

Embodiment 5 FIG. 9 is a perspective view showing a core material of a vacuum insulation panel according to Embodiment 5 of the present invention.
In FIG. 9, reference numeral 42 denotes a core material having heat insulating performance. In the vacuum heat insulating panel according to the fifth embodiment, the core material 42 is made of cardboard.

In the vacuum heat insulating panel according to the fifth embodiment, the core member 42 has a structure in which the corrugated members 42b are arranged on both surfaces of the plate-shaped member 42a.

The core material 42 having such a structure is formed on the both surfaces of the plate-like member 42a by using an adhesive.
2c is formed by fixing.

As described above, according to the fifth embodiment, since the core 42 is formed of corrugated cardboard, the gas held in the core 42 itself is easily released. Then, the core material 42 is provided on both sides of the plate-like member 42a by the corrugated members 42.
Since the b is arranged, the side surface of the corrugated member 42a is open, and the gas released from the core material 42 itself is easily discharged. For this reason, there is an effect that a heat insulating performance is high and a vacuum heat insulating panel that can make the inside of the packaging film a desired degree of vacuum in a short time can be obtained.

Further, since the core 42 is made of corrugated cardboard, the cost of the core 42 is low. For this reason, an effect that a low-cost vacuum heat insulating panel can be obtained is obtained.

Further, since the core member 42 has a structure in which the corrugated members 42b are arranged on both sides of the plate member 42a, the core member 42 is formed in the thickness direction of the vacuum heat insulating panel due to the presence of the plate member 42a. Corrugated member 42 that is strong against bending stress
Due to the presence of b, it is strong against compressive stress in the thickness direction of the vacuum insulation panel. That is, the presence of the wavy member 42b alleviates the compressive stress in the thickness direction of the vacuum heat insulating panel. For this reason, the effect that a vacuum heat insulation panel with stable heat insulation performance can be obtained is obtained.

Embodiment 6 FIG. In Embodiments 1 to 5, the core material is made of corrugated cardboard. If the degree of vacuum inside the packaging film increases, the insulation performance of the vacuum insulation panel will not only be the heat transfer inside the core material,
It is also affected by heat transfer by radiation on the surface of the core material. Therefore, in the vacuum heat insulating panel according to the sixth embodiment, a case will be described in which the sheet material forming the core has a low emissivity.

FIG. 10 is a sectional view showing a sheet material forming a core of a vacuum heat insulating panel according to Embodiment 6 of the present invention. In FIG. 10, 51 is a sheet-like material, 52 is a low thermal conductivity layer made of cardboard or cardboard having a low thermal conductivity, 53 is a low emissivity layer made of aluminum having a low emissivity, 54 is polyethylene provided on the outermost side A polymer resin layer 55 made of terephthalate, nylon, or the like is an adhesive layer provided between the low thermal conductivity layer 52 and the low emissivity layer 53.

As described above, in the vacuum heat insulating panel according to the sixth embodiment, the sheet material 51 constituting the core material is provided on the surface of the low thermal conductivity layer 52 by the adhesive layer 55 and the low emissivity layer 53.
And the polymer resin layer 54 are sequentially laminated. That is, the low emissivity layer 53 is formed on the surface.
Is provided.

The sheet material 5 constituting such a core material
1 is formed by depositing a material having a low emissivity on the polymer resin layer 54 to form a low emissivity layer 53 and attaching the low emissivity layer 53 to the low thermal conductivity layer 52 with an adhesive.

As described above, according to the sixth embodiment, the sheet-like material constituting the core is provided with the low-emissivity layer 53 having a low emissivity on the surface. Even when the degree of vacuum is high, there is an effect that a vacuum heat insulating panel having high heat insulating performance can be obtained.

When cardboard is used instead of cardboard, the same effect as when cardboard is used can be obtained. In addition, when foamed resin having open cells is used instead of corrugated cardboard, the same effect as when corrugated cardboard is used, except that the cost of the core material increases and the price of the vacuum insulation panel increases. Is obtained.

Further, as shown in FIG. 11, by providing a groove 56 reaching the low thermal conductivity layer 52 in the sheet-like material 51 constituting the core material, gas released from the core material itself can be easily discharged. be able to.

[0069]

As described above, according to the present invention, the core is made of a sheet-like material from which gas can be easily released, and has a structure which is strong against the stress in the thickness direction of the vacuum insulation panel. Therefore, there is an effect that a stable vacuum insulation panel having high heat insulation performance can be obtained.

According to the present invention, since the sheet material constituting the core material is cardboard or cardboard, there is an effect that a low-cost vacuum heat insulating panel can be obtained.

According to the present invention, since the sheet material constituting the core material has a low emissivity, it is possible to obtain a vacuum heat insulating panel having high heat insulating performance even when the degree of vacuum inside the packaging film is high. There is an effect that can be.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a vacuum heat insulating panel according to Embodiment 1 of the present invention.

FIG. 2 is a perspective view showing a core material of the vacuum heat insulating panel according to Embodiment 1 of the present invention.

FIG. 3 is a perspective view showing a modified example of the core material of the vacuum heat insulating panel according to Embodiment 1 of the present invention.

FIG. 4 is a perspective view showing a modified example of the core material of the vacuum heat insulating panel according to Embodiment 1 of the present invention.

FIG. 5 is a perspective view showing a core material of a vacuum heat insulating panel according to Embodiment 2 of the present invention.

FIG. 6 is a plan view showing a core material of a vacuum heat insulating panel according to Embodiment 2 of the present invention.

FIG. 7 is a perspective view showing a core material of a vacuum heat insulating panel according to Embodiment 3 of the present invention.

FIG. 8 is a perspective view showing a core material of a vacuum heat insulating panel according to Embodiment 4 of the present invention.

FIG. 9 is a perspective view showing a core material of a vacuum heat insulating panel according to Embodiment 5 of the present invention.

FIG. 10 is a cross-sectional view showing a sheet material forming a core of a vacuum heat insulating panel according to Embodiment 6 of the present invention.

FIG. 11 is a cross-sectional view showing a modification of the sheet material forming the core of the vacuum heat insulating panel according to Embodiment 6 of the present invention.

FIG. 12 is a cross-sectional view showing a structure of a vacuum heat insulating panel of Conventional Example 1.

FIG. 13 is an enlarged sectional view showing a vacuum heat insulating panel of Conventional Example 1.

FIG. 14 is a cross-sectional view illustrating a structure of a vacuum heat insulating panel of Conventional Example 2.

[Explanation of symbols]

1 Vacuum insulation panel, 2, 12, 22, 32, 42 core material, 42a plate member, 42b corrugated member, 51 sheet material, 53 low emissivity layer.

Continued on front page (72) Inventor Akihiro Fujishiro 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation (72) Inventor Yoshio Nishimoto 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Co., Ltd. In company

Claims (9)

[Claims] 1. A vacuum insulation panel comprising a core material having heat insulation performance and two packaging films for packaging the core material, wherein the core material is made of a sheet-like material from which gas is easily released. A vacuum insulation panel characterized by having a structure resistant to stress in the thickness direction of the vacuum insulation panel. 2. The core material has a shape in which a plurality of rectangles are continuously connected in one direction when viewed from the thickness direction of the vacuum heat insulating panel, and has a predetermined thickness in the thickness direction of the vacuum heat insulating panel. The vacuum heat insulating panel according to claim 1, wherein the vacuum heat insulating panel has a structure having the same. 3. The core material has a structure in which a plurality of hexagons are closely connected when viewed from the thickness direction of the vacuum insulation panel, and has a predetermined thickness in the thickness direction of the vacuum insulation panel. The vacuum insulation panel according to claim 1, wherein: 4. The core material has a structure in which a plurality of rectangles are closely connected when viewed from the thickness direction of the vacuum insulation panel, and has a predetermined thickness in the thickness direction of the vacuum insulation panel. The vacuum insulation panel according to claim 1, wherein: 5. The vacuum insulation panel according to claim 1, wherein the core has a wavy structure. 6. The vacuum heat insulating panel according to claim 1, wherein the core material has a structure in which corrugated members are arranged on both sides of a plate-shaped member. 7. The vacuum heat insulating panel according to claim 1, wherein the sheet-like material constituting the core is cardboard or cardboard. 8. The vacuum heat insulating panel according to claim 1, wherein the sheet material constituting the core has a low emissivity. 9. The vacuum heat insulating panel according to claim 8, wherein the sheet material constituting the core material has a low emissivity layer having a low emissivity on the surface.