JP2001032992A - Vacuum insulating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum insulating material having a high heat insulation property even when it is used under a high temperature by covering a core material with laminate films in a vacuum condition, and laminating, between the laminate films, an aluminum foil formed in a size not overlapped on a seal part of the laminate films. SOLUTION: A vacuum insulating material is provided with laminate films 2 for forming a gas barrier layer for preventing permeation of gas, a core material 1 covered with the laminate films 2, and an aluminum foil 6 laminated between the laminate films 2, the laminate films 2 have an aluminum deposited layer 5 formed by vapor-depositing aluminum on a film, the aluminum foil 6 is formed in a size which is not overlapped on a seal part 3 of the laminate film 2, and thereby, the vacuum insulating material having a high heat insulation property is provided even when it is used under a high temperature. Since a melting point and a glass transition point are high and there is good size stability with respect to temperature change, it is possible to prevent generation of pinhole on the aluminum deposited layer 5 even when the vacuum insulating material is used under a high temperature atmosphere.

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 material used for refrigerators and jar pots, for example.

[0002]

2. Description of the Related Art A conventional vacuum heat insulating material uses an aluminum foil or a laminated film having an aluminum vapor-deposited layer obtained by vapor-depositing aluminum on polyethylene terephthalate or polypropylene as a gas barrier layer, and is mainly used as a refrigerator or a refrigerator. It is used for heat insulation in low-temperature atmosphere such as. The gas barrier layer is a gas barrier layer that is turned on and off when a device using a vacuum heat insulating material is turned on and off, and when heat stress is applied to the vacuum heat insulating material, for example, when a pinhole or the like is generated in a part of the laminate film. A function to prevent transmission through a film.

[0003]

In the conventional vacuum heat insulating material, the amount of heat transmitted in the creeping direction of the vacuum heat insulating material is larger than the amount of heat transmitted in the cross-sectional direction of the vacuum heat insulating material, so that sufficient heat insulating performance cannot be exhibited. There is a problem that.

[0004]

The present invention uses a film on which at least aluminum is deposited as a laminate film for forming a gas barrier layer for preventing gas permeation,
The core material is covered by the laminated film in a vacuum state, and an aluminum foil having a size that does not cover the sealing portion of the laminated film is laminated between the laminated films to form a vacuum heat insulating material having high heat insulating performance even at a high temperature. .

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention described in claim 1 uses a film on which at least aluminum is deposited as a laminate film for forming a gas barrier layer for preventing gas permeation, and covers the core material in a vacuum with the laminate film. An aluminum foil having a size that does not cover the sealing portion of the laminated film is laminated between the laminated films to form a vacuum heat insulating material having high heat insulating performance even when used at a high temperature.

According to a second aspect of the present invention, the laminated film is made of a polyethylene naphthalate resin as a base material, and is a vacuum heat insulating material capable of performing heat insulation for a long time even in a high-temperature atmosphere.

According to a third aspect of the present invention, the film on which aluminum is deposited is formed by using two layers in such a manner that the aluminum deposition surfaces face each other, so that gas intrusion can be prevented. It is a vacuum heat insulating material that can provide heat insulation.

According to a fourth aspect of the present invention, the aluminum foil is a high-performance vacuum heat insulating material that can accurately realize a fine shape as a predetermined shape by being attached to a film and then etching.

According to a fifth aspect of the present invention, the aluminum foil is laminated on a laminate film to provide a high-performance vacuum heat insulating material which is easy to process.

According to a sixth aspect of the present invention, the aluminum foil is laminated between a film on which aluminum is deposited and a sealing layer to form a high-performance vacuum heat insulating material having excellent durability.

In the invention described in claim 7, the aluminum foil is laminated between two aluminum vapor deposition layers to form a high-performance vacuum heat insulating material having excellent durability.

In the invention described in claim 8, the film on which aluminum is deposited is laminated between the aluminum foil and the sealing layer to form a high-performance vacuum heat insulating material having excellent durability.

[0013]

(Embodiment 1) A first embodiment of the present invention will be described below. FIG. 1 is a sectional view showing the configuration of the vacuum heat insulating material of the present embodiment. In the vacuum heat insulating material of this embodiment, the core material 1 is 2
It is configured to be covered with the laminated film 2 of the layer and sealed by using the sealing portion 3 in a state where the inside is evacuated. As the core material 1, an inorganic substance such as pearlite or glass wool, or an organic substance such as melamine or urethane can be used. In the present embodiment, a powder of synthetic silica is used. The laminate film 2 includes a protective layer 7 composed of a polyethylene naphthalate film (hereinafter referred to as a PEN film), a seal layer 4 composed of a polypropylene film, and an aluminum vapor-deposited layer 5 in which aluminum is vapor-deposited on the PEN film. ing. In particular, in this embodiment, between the aluminum deposition layer 5 and the protective layer 7,
The aluminum foil 6 is laminated. In this embodiment, the aluminum foil 6 has a thickness of 6 μm.
As shown in FIG. 2, the size is set so as not to cover the seal portion 3 of the laminate film 2. FIG. 2 is a plan view showing the configuration of the present embodiment. In this embodiment, unstretched polypropylene having a thickness of 50 μm is used for the sealing layer 4, and the deposited thickness of aluminum is set to 0.05.
μm. The protective layer 7 is made of PE having a thickness of 12 μm.
N film is used.

The operation of this embodiment will be described below. When the vacuum heat insulating material of this embodiment is used by being incorporated into a device such as a jar pot (not shown), a temperature difference naturally occurs on both surfaces of the vacuum heat insulating material. That is, the one surface is almost boiling water and the temperature is close to 100 ° C. The other is at room temperature because it is the outer surface of the jar. In this state, the amount of heat of the water is transmitted to the outer surface of the jar via the vacuum heat insulating material. The heat conduction at this time can be considered from both the cross-sectional direction of the used heat insulating material and the creeping direction of the used heat insulating material. The amount of heat transfer at this time is proportional to the product of the thermal conductivity and the thickness of the material. In the configuration of the present embodiment, the product of the thermal conductivity and the thickness is 0.01 [｛W
/ (M · K)｝ · m], and the aluminum foil 6 is 1.4
[{W / (m · K)} · m], aluminum deposition layer 5 is 0.0
12 [{W / (m · K)} · m], and the protective layer 7 is 0.00
3 [{W / (m · K)} · m]. That is,
The aluminum foil 6 can conduct heat 50 times in total of the other parts.

As a result, when the vacuum heat insulating material of this embodiment is used, heat conduction in the creeping direction of the vacuum heat insulating material is extremely small. That is, since the aluminum foil 6 does not exist in the seal portion 3, the amount of heat moving in this portion is 1/5 of the central portion where the aluminum foil 6 exists.
It is 0. Therefore, as mentioned above,
In the case of this embodiment, heat conduction from the creeping direction of the heat insulating material is very small. Further, a vacuum layer including the core material 1 exists in the cross-sectional direction of the vacuum heat insulating material of the present embodiment. As a result, the vacuum heat insulating material of this embodiment has a very high heat insulating property.

Further, for example, by turning on and off a power supply of an apparatus using a vacuum heat insulating material, the vacuum heat insulating material is subjected to a temperature stress on a daily basis. The vacuum heat insulating material of this embodiment is very strong against this temperature stress. That is, in this embodiment, the aluminum deposition layer 5
A PEN film is used as a base material for forming a PEN film. The PEN film not only has a high melting point and a high glass transition point, but also has good dimensional stability against temperature changes.
Therefore, when subjected to thermal stress, the difference between the shape change due to the expansion and contraction of aluminum and the shape change due to the expansion and contraction of the PEN film itself is small. Therefore, as a result of the thermal stress, almost no stress is generated on the aluminum deposited layer 5, that is, no pinhole is generated in the aluminum deposited layer 5 even in a high temperature atmosphere. As a result, the laminated film 2 of the present embodiment functions as a long-life and highly reliable scab barrier layer.

As described above, according to the present embodiment, the laminate film 2 for forming the gas barrier layer for preventing gas permeation is formed.
And a core material 1 covered with a laminate film 2,
Aluminum foil 6 laminated between laminated films 2
The laminated film 2 has an aluminum vapor-deposited layer 5 in which at least aluminum is vapor-deposited on the film, and the aluminum foil 6 has a size that does not cover the sealing portion 3 of the laminated film 2. However, it realizes a vacuum heat insulating material having high heat insulating performance.

Further, according to this embodiment, since the laminated film 2 uses polyethylene naphthalate resin as a base material, it has a high melting point and a glass transition point, and has good dimensional stability against a temperature change. Thus, it is possible to prevent pinholes from being generated in the aluminum vapor-deposited layer 5 even when used at a high temperature.

At this time, in this embodiment, the aluminum foil 6 is formed by etching. That is, after the aluminum foil 6 is bonded to the entire inside of the protective layer 7, a predetermined portion of the aluminum foil is dissolved and removed by etching as shown in FIG. At this time, an alkaline solution is used as an etching solution. Since this etching enables fine processing, a desired shape can be accurately produced. Therefore, in the present embodiment, a fine shape can be accurately realized, and a high-performance vacuum heat insulating material is realized.

(Embodiment 2) Next, a second embodiment of the present invention will be described. FIG. 3 is a sectional view showing the configuration of the present embodiment. In this embodiment, aluminum vapor-deposited layers 5a and 5b in which aluminum is vapor-deposited on a film are used. That is, two aluminum deposition layers 5a and 5b arranged so that the aluminum deposition surfaces face each other are used by bonding. The aluminum deposited layer 5a has a PEN film on the aluminum foil 6 side, and the aluminum deposited layer 5b has a PEN film on the surface side.

FIG. 4 is a sectional view showing a detailed configuration of this embodiment. The aluminum deposition layer 5a is an aluminum deposition layer 1
2a and a PEN film 11a used as a base material. Alternatively, the formed film includes at least the substrate 11 and the aluminum vapor-deposited layer 12.
The aluminum vapor-deposited layer 5b is composed of an aluminum vapor-deposited layer 12b and a PEN film 11b used as a base material. Thus, the aluminum deposited layer 5a and the aluminum deposited layer 5b are bonded together with the adhesive 9. Aluminum deposited layer 12a or Aluminum deposited layer 12b
Is set to a thickness of about 50 μm. Since the aluminum deposition layer is very thin as described above, the pinhole 10 is easily generated. Pinhole 10
When the gas passes through, the heat insulating property is reduced, and the performance as a heat insulating material is deteriorated. In this respect, in this embodiment, two aluminum vapor-deposited layers 5a and 5b are bonded so that the vapor-deposited layers 12a and 12b face each other. For this reason, the generated pinholes 10 are closed by the PEN films 11a and 11b.

As described above, according to the present embodiment, the aluminum vapor deposition layer has a configuration in which two layers are used in such a manner that the aluminum vapor deposition surfaces face each other. Is realized.

At this time, in this embodiment, as shown in FIG. 3, the aluminum foil 6 is disposed between the aluminum deposition layer 5a and the sealing layer 4. Aluminum foil 6
Has a very thin thickness of 6 μm. For this reason,
When heat stress is applied, the sealing layer 4 is formed when the laminated film 2 contracts and causes friction with the core material 1, and when the laminated film 2 generates friction with external components, the two aluminum deposited layers 5 a and 5 b are formed. Works effectively to protect the vacuum insulation material. Therefore, the vacuum heat insulating material of this embodiment is a high-performance vacuum heat insulating material having excellent durability.

(Embodiment 3) Next, a third embodiment of the present invention will be described. FIG. 5 is a cross-sectional view illustrating the configuration of the present embodiment. FIG. 6 is a sectional view showing a detailed configuration of the present embodiment. In this embodiment, the aluminum foil 6 is disposed between the two aluminum deposition layers 5a and 5b.
Further, the aluminum foil 6 used at this time has a size such that it does not cover the seal portion 3 and is attached to the PEN film constituting the aluminum vapor-deposited layer 5a or 5b. The adhesive used at this time is applied to a smaller area than the aluminum foil 6, as shown by 9 in FIG. Therefore, in practice, a space 13 without adhesive is likely to be formed at the end of the aluminum foil 6. When the space 13 is generated, a gas such as air may pass between the laminated films through the space 13. In this respect, in this embodiment, since the aluminum foil 6 is arranged between the aluminum deposition layer 5a and the aluminum deposition layer 5b, even if the space 13 occurs, the aluminum deposition layer 5a and the aluminum deposition layer 5b are present. PEN
The film can prevent the invasion of the air.

Therefore, according to this embodiment, the aluminum foil 6 is simply bonded on the PEN film.
It is very easy to process and realizes a high-performance vacuum insulation material. Further, since a chemical treatment such as etching is not performed, there is no concern that the resin is deteriorated, and a vacuum heat insulating material that can be used for a long time is realized.

(Embodiment 4) Next, a fourth embodiment of the present invention will be described. FIG. 7 is a cross-sectional view illustrating the configuration of the present embodiment. In this embodiment, the aluminum deposition layers 5a and 5b are
It is laminated between the aluminum foil 6 and the sealing layer 4, and the outer surface of the aluminum foil 6 is covered with a protective layer 8. The protective layer 8 is made of nylon.

Therefore, even if the space 13 described with reference to FIG. 6 is formed at the end of the aluminum foil 6 or the like, the gas passing through the space 13 exists because the two aluminum vapor deposition layers 5a and 5b exist. Can be prevented from entering.
Therefore, according to the present embodiment, a high-performance vacuum heat insulating material that can be used for a long time can be realized.

[0028]

According to the first aspect of the present invention, there is provided a laminate film for forming a gas barrier layer for preventing gas permeation,
A core material covered with the laminate film, and an aluminum foil disposed between the laminate films, wherein the laminate film has an aluminum vapor-deposited layer in which at least aluminum is vapor-deposited on the film, and the aluminum foil is a laminate film The present invention realizes a vacuum heat insulating material having a high heat insulating performance even when used at a high temperature as a structure having a size that does not cover the seal portion.

According to a second aspect of the present invention, a vacuum heat insulating material capable of providing long-term heat insulation even in a high-temperature atmosphere is realized by using a laminate film made of a polyethylene naphthalate resin as a base material.

According to a third aspect of the present invention, the aluminum vapor deposition layer has a structure in which two layers are used in such a manner that the aluminum vapor deposition surfaces face each other, so that gas intrusion can be prevented and heat insulation for a long time even in a high temperature atmosphere can be achieved. It realizes a vacuum insulation material that can be used.

According to a fourth aspect of the present invention, the aluminum foil is formed into a predetermined shape by etching after bonding to a film, thereby realizing a fine shape accurately and realizing a high-performance vacuum heat insulating material. It is.

According to a fifth aspect of the present invention, the aluminum foil is laminated on a laminate film to realize a high-performance vacuum heat insulating material which is easy to process.

According to the invention described in claim 6, the aluminum foil is laminated between a film on which aluminum is deposited and a sealing layer to realize a high-performance vacuum heat insulating material having excellent durability. .

According to a seventh aspect of the present invention, the aluminum foil is laminated between two aluminum deposition layers.
This realizes a high-performance vacuum heat insulating material with excellent durability.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a vacuum heat insulating material according to a first embodiment of the present invention.

FIG. 2 is a plan view of a laminate film illustrating the shape of the aluminum foil.

FIG. 3 is a sectional view showing a configuration of a vacuum heat insulating material according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view illustrating a structure of an aluminum deposition layer.

FIG. 5 is a sectional view showing a configuration of a vacuum heat insulating material according to a third embodiment of the present invention.

FIG. 6 is a sectional view showing the detailed configuration of the aluminum foil.

FIG. 7 is a sectional view showing a configuration of a vacuum heat insulating material according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core material 2 Laminate film 3 Seal part 4 Seal layer 5 Aluminum vapor-deposited layer 5a Aluminum vapor-deposited layer 5b Aluminum vapor-deposited layer 6 Aluminum foil 7 Protective layer 9 Adhesive 11a PEN film 11b PEN film 12a Aluminum vapor-deposited layer 12b Aluminum vapor-deposited layer

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Mitsuhiro Sano 1006 Kazuma Kadoma, Osaka Pref.Matsushita Electric Industrial Co., Ltd. F term (reference) 3H036 AA08 AA09 AB03 AB28 AC03 AE01 AE04

Claims (8)

[Claims] 1. A laminate film for forming a gas barrier layer for preventing gas permeation, a core material covered by the laminate film, and an aluminum foil disposed between the laminate films, wherein the laminate film is made of at least aluminum. A vacuum heat insulating material having an aluminum vapor-deposited layer vapor-deposited on a film, wherein the aluminum foil has a size that does not cover the sealing portion of the laminated film. 2. The vacuum heat insulating material according to claim 1, wherein the laminate film is made of a polyethylene naphthalate resin as a base material. 3. The vacuum heat insulating material according to claim 1, wherein two aluminum vapor-deposited layers are used such that aluminum vapor-deposited surfaces face each other. 4. The vacuum heat insulating material according to claim 1, wherein the aluminum foil is bonded to a film and then etched to have a predetermined shape. 5. The vacuum heat insulating material according to claim 1, wherein the aluminum foil is laminated on a laminate film. 6. The vacuum heat insulating material according to claim 1, wherein the aluminum foil is laminated between a film on which aluminum is deposited and a sealing layer. 7. The vacuum heat insulating material according to claim 3, wherein the aluminum foil is laminated between two aluminum vapor deposition layers. 8. The vacuum heat insulating material according to claim 1, wherein the film on which aluminum is deposited is laminated between the aluminum foil and the sealing layer.