Vacuum heat insulation material

Abstract

The invention provides a vacuum heat insulation material which can restrain a heat bridge and can easily grasp the position of an adsorption device while ensuring gas barrier property. The present invention is provided with a core material (11), an adsorption device (20) for adsorbing air or moisture, and an outer cover material (30) having gas barrier properties, and vacuum sealing is performed by covering the core material (11) and the adsorption device (20) with the outer cover material (30). The outer cover (30) is composed of a laminated film having transparency on the entire surface, and comprises an adsorption means (20), an opening (24) for communicating the outside and inside of the adsorption means (20), and an unsealing mechanism (25) for the opening (24).

Description

Technical Field

[0001] The present invention relates to a vacuum thermal insulation material. Background Art

[0002] Patent document 1 discloses a vacuum insulation material, which includes the following laminated films: a laminated film composed of a polyethylene terephthalate film layer, a nylon film layer, an aluminum foil layer, and a high-density polyethylene film layer; a laminated film composed of a barrier film layer having multiple inorganic oxide vapor-deposited layers, a nylon film layer, a barrier film layer having multiple inorganic oxide vapor-deposited layers, and a high-density polyethylene film layer, wherein an insulating core material is sealed in a packaging bag with the high-density polyethylene film layer as the inner side and the interior is vacuum-sealed.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent No. 4649969 Summary of the invention

[0006] Problems to be solved by the invention

[0007] The present invention provides a vacuum heat insulating material which can ensure gas barrier properties, suppress heat bridges, and easily grasp the unsealing position of an adsorption device.

[0008] Methods for solving problems

[0009] In order to solve the above-mentioned problems, the vacuum insulation material of the present invention comprises a core material, an adsorption device for adsorbing air or moisture, and an outer covering with gas barrier properties, and the core material and the adsorbent are covered with the outer covering to perform vacuum sealing. In the vacuum insulation material, the outer covering is composed of a laminate film having transparency on the entire surface, and the adsorption device comprises an opening for connecting the outside and the inside of the adsorption device, and an opening mechanism for the opening.

[0010] In addition, this specification includes the entire contents of Japanese Patent Application No. 2022-167310 filed on October 19, 2022.

[0011] Effects of the Invention

[0012] According to the present invention, since the outer covering is formed as a whole transparent, the position of the adsorption device can be visualized, so the workability of opening can be improved. In addition, since the outer covering is formed of a non-metallic material, thermal bridges can be suppressed, and when the vacuum insulation material is applied to products such as refrigerators, it can contribute to energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1This is a schematic cross-sectional view showing the vacuum heat insulating material in the first embodiment.

[0014] Figure 2 It is a schematic plan view showing the vacuum heat insulating material in the first embodiment.

[0015] Figure 3 This is a schematic cross-sectional view showing the layered structure of the outer covering member in the first embodiment.

[0016] Figure 4 This is a schematic cross-sectional view showing the adsorption device in the first embodiment. DETAILED DESCRIPTION

[0017] (Knowledge and insights that form the basis of the present invention, etc.)

[0018] When the inventors considered the present invention, most of the vapor-deposited laminated films used in vacuum insulation materials were aluminum vapor-deposited films. However, since the aluminum material of the vapor-deposited material has thermal conductivity, there is a possibility of thermal bridges. Therefore, it was proposed to provide a non-metal vapor-deposited outer covering with low thermal conductivity on one side of the vacuum insulation material.

[0019] However, in the prior art, in order to ensure the barrier properties under normal temperature environment, aluminum foil is used on one side of the vacuum insulation material, which can ensure the gas barrier properties, but there is still room for improvement in order to further reduce thermal bridges. In addition, in order to improve the thermal insulation performance of the vacuum insulation material, an adsorption device that adsorbs moisture or gas is sometimes stored inside the outer covering. However, since the adsorption device that adsorbs gas reacts with oxygen and nitrogen in the air during the manufacturing process and is easily deactivated, the following method is used: the pre-activated adsorbent is filled into a storage container and sealed, the container is stored inside the vacuum insulation material and vacuum-sealed, and then an unsealing mechanism is used to connect the space filled with the adsorbent with the internal space of the vacuum insulation material to exert the adsorption function.

[0020] However, the inventors have discovered that when the outer cover is provided with metal foil or metal vapor deposition, the opening position of the opening mechanism of the adsorption device cannot be accurately grasped from the outside of the outer cover, and sometimes the opening cannot be properly performed. The subject matter of the present invention was obtained to solve this problem.

[0021] Therefore, the present invention provides a vacuum heat insulating material which can suppress heat bridges while ensuring gas barrier properties and can easily grasp the unsealing position of an adsorption device.

[0022] The following describes the implementation in detail with reference to the accompanying drawings. However, sometimes more detailed descriptions than necessary are omitted. For example, there are cases where detailed descriptions of already known matters or repeated descriptions of substantially the same structures are omitted.

[0023] In addition, the drawings and the following description are provided for those skilled in the art to fully understand the present invention, and are not intended to limit the subject matter described in the claims by these descriptions.

[0024] (Implementation Method 1)

[0025] Below, use Figure 1 to Figure 4 Implementation method 1 will be described.

[0026] [1-1. Structure]

[0027] Figure 1 This is a schematic cross-sectional view showing a vacuum heat insulating material according to Embodiment 1 of the present invention. Figure 2 It is a schematic plan view showing the vacuum heat insulating material according to the first embodiment.

[0028] In addition, Figure 1 In the figure, a gap is formed between the core material 11 and the outer covering member 30 for ease of understanding, but in reality, they are in a close contact state without a gap.

[0029] like Figure 1 and Figure 2 As shown, the vacuum heat insulating material 10 includes a core material 11, an adsorbing device for adsorbing air or moisture, and an outer covering member 30. The outer covering member 30 accommodates the core material 11 and the adsorbing device 20, and seals the outer covering member 30 so that the inner portion is vacuumed by tightly contacting the peripheral portion.

[0030] The outer covering member 30 is made of a laminate film having excellent gas barrier properties, and even when the vacuum heat insulating material 10 is stored in the atmosphere, little air enters the interior, and the entire surface is transparent.

[0031] Figure 3 It is a schematic cross-sectional view showing the layered structure of the outer covering member 30 .

[0032] like Figure 3 As shown, the outer covering member 30 is formed by laminating a protective layer 31, a barrier layer 32, and a welding layer 33 in this order from the outside. In addition, the protective layer 31 and the barrier layer 32 may be formed in multiple layers.

[0033] The protective layer 31 is usually made of nylon, OPP (Oriented Polypropylene), or PET (PolyEthylene Terephthalate), but is not limited thereto. The protective layer 31 is formed to have a thickness of about 12 μm to 40 μm.

[0034] By forming the protective layer 31 in this manner, it is possible to suppress bag breakage due to friction, contact, etc. generated when the vacuum heat insulating material 10 is packaged or transported.

[0035] In addition, the protective layer 31 may be replaced by the barrier layer 32 and the protective layer 31 may be omitted.

[0036] The barrier layer 32 has a structure including a base film 34 and a vapor-deposited layer 35 provided on the outer side of the base film 34 . The barrier layer 32 as a whole is formed using a material having a high barrier property, such as a layer of a clay mineral having a barrier property.

[0037] PET or nylon is used as the base film 34. The base film 34 is formed to have a thickness of about 12 μm to 16 μm.

[0038] As the vapor deposition layer 35, an inorganic oxide such as silicon dioxide or aluminum oxide is used. The vapor deposition layer 35 is formed to have a thickness of several hundred angstroms. A coating layer may also be provided on one or both sides of the vapor deposition layer 35. The coating layer is generally made of a resin such as PVA (Polyvinyl alcohol) or an organic-inorganic hybrid material.

[0039] In addition, the base film 34 and the vapor-deposited layer 35 may be formed in multiple layers.

[0040] Low-density polyethylene (Linear Low Density Polyethylene) is generally used as the welding layer 33. The welding layer 33 is formed to have a thickness of about 40 μm to 50 μm.

[0041] As the welding layer 33, besides these, high-density polyethylene (High Density PolyEthylene) or OPP may be used.

[0042] When the vacuum heat insulating material 10 is used for high temperature products (tanks, etc.), unstretched polypropylene (Cast Polypropylene) is used for the welding layer 33. In this case, the welding layer 33 is formed to be about 30 μm to 50 μm.

[0043] Although the core material 11 is not particularly specified, it is possible to use a core material that can resist atmospheric pressure and maintain thickness when decompressed and sealed, and has a high porosity and low solid thermal conductivity. For example, preferably an inorganic powder assembly, particularly preferably silica powder, an inorganic fiber assembly, particularly preferably a glass fiber assembly. In addition, as an organic material, a connected bubble type polyurethane foam, PET and PP fiber assembly can also be used.

[0044] Figure 4 This is a schematic cross-sectional view showing the adsorption device in the first embodiment.

[0045] like Figure 4 As shown, the adsorption device 20 includes a packaging container 21 and an adsorbent 22 for adsorbing water or air contained in the packaging container 21 .

[0046] As the packaging container 21, a soft packaging material can be used, for example, a multilayer material composed of a PET layer on which aluminum is vapor-deposited, an aluminum layer, and a low-density polyethylene layer. Alternatively, a container made of metal such as aluminum can be used.

[0047] The adsorbent 22 is not particularly specified in the case of adsorbing gas, but various adsorbent materials by chemical adsorption and physical adsorption, such as various metal getters, zeolite and other gas adsorbing materials can be used. In addition, in this embodiment, ZSM-5 zeolite is used. The adsorbent 22 is used in a state capable of adsorbing gas by preheating to release the adsorbed gas.

[0048] The adsorbent 22 is not particularly limited in the case of adsorbing moisture, but preferably has a large binding energy with moisture adsorbed once and a large adsorption amount per unit weight, and for example, calcium oxide, potassium oxide, etc. can be used.

[0049] The adsorption device 20 is provided with a ventilation path 23 that communicates the inside and outside of the packaging container 21. An opening 24 is provided at the front end of the ventilation path 23. An unsealing mechanism 25 is provided in the middle of the ventilation path 23.

[0050] As the opening mechanism 25, for example, any of sealing glass, sealing brazing material, and an opening pin is used.

[0051] The adsorption device 20 is disposed between the core material 11 and the outer cover 30 . Thus, the adsorption device 20 can be seen from the outside of the outer cover 30 .

[0052] Alternatively, the adsorption device 20 may be disposed inside the core material 11. In this case, the surface disposed inside the core material 11 allows the unsealed position 25 of the adsorption device 20 to be visible from outside the outer cover 30, and the end of the adsorption device 20 can be prevented from damaging the outer cover 30.

[0053] Next, the operation of this embodiment will be described.

[0054] In the present embodiment, the vacuum heat insulating material 10 is formed by reducing the pressure inside the outer cover 30 to a vacuum state and sealing the inner part thereof with the core material 11 and the adsorption device 20 accommodated therein.

[0055] Then, an external force is applied to the opening mechanism 25 from the outside of the outer covering member 30 , so that cracks or the like are generated in the opening mechanism 25 , thereby opening the ventilation path 23 .

[0056] At this time, since the entire outer cover 30 is formed transparent, the position of the suction device 20 can be visualized, and thus the workability of opening can be improved.

[0057] Furthermore, since the outer covering member 30 is formed of a non-metallic material, thermal bridges can be suppressed, and when the vacuum heat insulating material 10 is applied to products such as refrigerators, it can contribute to energy saving.

[0058] [1-3. Effects, etc.]

[0059] As described above, in this embodiment, there are a core material 11, an adsorbing device 20 for adsorbing air or moisture, and an outer covering member 30 having a gas barrier property, and the core material 11 and the adsorbing device 20 are covered and vacuum-sealed by the outer covering member 30. The outer covering member 30 is composed of a laminate film having a transparent surface, and includes the adsorbing device 20, an opening 24 connecting the outside and the inside of the adsorbing device 20, and an opening mechanism 25 for opening the opening 24.

[0060] Thus, since the outer covering member 30 is formed as a whole transparent, the position of the adsorption device 20 can be visualized, so that the workability of opening can be improved. In addition, since the outer covering member 30 is formed of a non-metallic material, thermal bridges can be suppressed, and when the vacuum insulation material 10 is applied to products such as refrigerators, it can contribute to energy saving.

[0061] In addition, in the present embodiment, the unsealing mechanism 25 of the adsorbent 22 is opened after the adsorption device 20 is covered with the outer covering member 30 and vacuum-sealed.

[0062] Thus, by unsealing the adsorption device 20 after vacuum sealing, when a material with high adsorption activity is used, the adsorption capability of the adsorption device 20 can be maintained.

[0063] In addition, in the present embodiment, the unsealing mechanism 25 of the adsorption device 20 is formed of any one of sealing glass, sealing brazing material, and an unsealing pin.

[0064] Thus, the unsealing mechanism 25 can withstand high temperatures.

[0065] (Other embodiments)

[0066] In addition, as an example of the technology disclosed in the present application, the first embodiment has been described. However, the technology of the present invention is not limited to this, and can also be applied to the embodiments in which changes, replacements, additions, omissions, etc. are made.

[0067] (Note)

[0068] According to the description of the above embodiments, the following technology is disclosed.

[0069] (Technology 1) A vacuum insulation material comprising a core material, an adsorbent device for adsorbing air or moisture, and an outer packaging material with gas barrier properties, wherein the core material and the adsorbent device are covered with the outer packaging material to perform vacuum sealing, wherein the outer packaging material is composed of a laminate film having transparency on the entire surface, and the adsorbent device includes an opening for connecting the outside and the inside of the adsorbent device, and an opening mechanism for the opening.

[0070] According to this structure, since the entire outer covering is transparent, the position of the adsorption device can be visualized, so the workability of opening can be improved. In addition, since the outer covering is formed of a non-metallic material, thermal bridges can be suppressed, and when the vacuum insulation material is applied to products such as refrigerators, it can contribute to energy saving.

[0071] (Technique 2) The vacuum heat insulating material according to Technique 1, wherein the unsealing mechanism of the adsorption device can unseal the adsorption device after the adsorption device is covered with the outer covering member and vacuum-sealed.

[0072] According to this configuration, by unsealing the adsorption device after vacuum sealing, when a material with high adsorption activity is used, the adsorption capacity of the adsorption device can be maintained.

[0073] (Technique 3) In the vacuum heat insulating material according to Technique 2, the unsealing mechanism of the adsorption device is composed of any one of sealing glass, sealing brazing material, and an unsealing pin.

[0074] According to this structure, the unsealing mechanism can withstand high temperature.

[0075] Industrial Applicability

[0076] As described above, the vacuum heat insulating material of the present invention can suppress heat bridges while ensuring gas barrier properties, and can easily grasp the position of the adsorption device, and can be preferably used as a vacuum heat insulating material.

[0077] Description of Reference Numerals

[0078] 10 Vacuum insulation material

[0079] 11 core material

[0080] 20 Adsorption device

[0081] 21 Packaging Container

[0082] 22 Adsorbent

[0083] 23 Ventilation path

[0084] 24 Opening

[0085] 25 Kaifeng Agency

[0086] 30 Outer cover

[0087] 31 Protective layer

[0088] 32 Barrier layer

[0089] 33 Welding layer

[0090] 34 Base film

[0091] 35 Evaporation layer.

Claims

1. A vacuum heat insulating material comprising a core material, an adsorbing device for adsorbing air or moisture, and an outer covering member having gas barrier properties, wherein the core material and the adsorbing device are covered with the outer covering member to perform vacuum sealing, wherein the vacuum heat insulating material is characterized in that: The outer covering member is composed of a laminate film having transparency over the entire surface. The adsorption device includes an opening for communicating the outside and the inside of the adsorption device, and an unsealing mechanism for the opening.

2. The vacuum heat insulating material according to claim 1, wherein: The unsealing mechanism of the adsorption device can unseal the adsorption device after the adsorption device is covered with the outer cover to be vacuum-sealed.

3. The vacuum heat insulating material according to claim 2, wherein: The unsealing mechanism of the adsorption device is composed of any one of sealing glass, sealing solder, and an unsealing pin.

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