JP4969436B2 - Vacuum insulation material and equipment using the same - Google Patents

Description

  The present invention relates to a vacuum heat insulating material that blocks heat influence, and an apparatus using the same.

  In recent years, from the viewpoint of global warming, energy reduction such as power consumption is desired for various products including home appliances. For example, if the amount of power consumed by the refrigerator is constant, the energy consumed by improving the efficiency of the cooling compressor or improving the heat insulation performance of the heat insulating material involved in the amount of heat leakage Can be reduced. Up to now, vacuum heat insulating materials have been developed as heat insulating materials for reducing the thermal conductivity, and have been used in many refrigerators and freezers. Compared to heat insulating materials such as urethane foam, vacuum heat insulating materials have a very low thermal conductivity.

  In recent years, the internal volume of refrigerators has been increasing. By reducing the thickness of the heat insulating material, that is, the wall, the internal volume of the refrigerator can be increased when the external dimensions are the same. When the thickness of the wall is reduced, the heat insulating performance is lowered. Therefore, in order to compensate for the decrease in the heat insulating performance, a lower thermal conductivity is required for the vacuum heat insulating material.

  Patent Document 1 describes a vacuum heat insulating material in which a core material made of inorganic fibers is covered with a gas barrier film and the inside is sealed under reduced pressure.

  Patent Document 2 describes a vacuum heat insulating material including a core material and an outer packaging material that can store the core material and maintain the inside in a reduced pressure state.

JP 2001-336691 A JP 2006-153199 A

  In the vacuum heat insulating material, in order to maintain a low thermal conductivity for a long period of time, it is necessary to use an aluminum vapor deposition layer or a thin foil as a gas barrier layer. However, since aluminum metal has a very high thermal conductivity, a heat bridge is generated where heat travels through the aluminum portion, which adversely affects the amount of heat leakage in the heat insulating performance.

  In Patent Document 1, a vacuum insulation using a sheet-like molded body made of inorganic fibers as a core material and a laminated film in which a metal foil and a plastic film are laminated or a plastic film on which metal deposition is performed is used as a gas barrier film. The materials are listed. The thermal conductivity is 0.0033 to 0.0045 (W / m · K).

  Patent Document 2 describes a vacuum heat insulating material that uses a sheet-like organic fiber aggregate as a core material and uses a laminate of nylon, aluminum-deposited polyethylene terephthalate, aluminum foil, high-density polyethylene or the like as an outer packaging material. ing. The minimum thermal conductivity is 0.003 (W / m · K).

  The present invention is a vacuum heat insulating material having a thermal conductivity lower than that of the vacuum heat insulating materials described in Patent Documents 1 and 2 in order to further increase the efficiency and capacity of various devices such as refrigerators. Is to provide.

  The feature of the present invention that solves the problem of the present application is that, in a vacuum heat insulating material in which a core material of inorganic fiber is placed in an outer packaging material having gas barrier properties, and the inside is decompressed, a protrusion is formed on the surface of the outer packaging material having gas barrier properties. It exists in the vacuum heat insulating material characterized by having.

  The outer packaging material includes a gas barrier layer that blocks gas and liquid, and a welding layer for making the outer packaging material into a bag shape. Further, an overcoat layer for improving the strength or the like, or other organic / inorganic thin films may be added to form a multilayer film. In order to form protrusions on the outer packaging material, the gas barrier layer and other surfaces may be uneven, or unevenness may be formed on the weld layer.

  Heat transfer in the vacuum heat insulating material is caused by solids and gas in the heat insulating material. Normally, the vacuum heat insulating material is depressurized and heat transfer by gas is negligible. Therefore, the vacuum heat insulating material is greatly affected by the heat transmitted through the solid. In particular, the vacuum heat insulating material is produced by depressurizing the inside thereof, and thus receives pressure from the atmosphere. In a state where pressure is applied, heat transfer occurs between the surface of the device to which the core material and the outer packaging material or the vacuum heat insulating material are attached and the contact surface of the outer packaging material.

  By forming protrusions on the surface of the outer packaging material, the contact between the core material and the outer packaging material, and the outer packaging material and the device to be insulated is changed from the contact on the surface to the point contact. As a result, the thermal resistance can be increased. The material of the protrusion-shaped part is not particularly limited, but the heat conductivity can be further reduced if it is made of a material having a low heat conductivity.

  As the shape of the projection, a quadrangular prism, a quadrangular pyramid, a cylinder, a cone, and the like are conceivable. In particular, it is desirable to use a cone-shaped projection for increasing contact thermal resistance. Further, the length of the protrusion has a great influence on the thermal resistance. The protrusions are preferably long (high), and particularly have a heat insulation performance when they have a length of 30 μm or more.

  The protrusion may be organic or inorganic. For example, when the outer packaging material is a multilayer film of organic matter-inorganic matter-organic matter, it is possible to form irregularities on the organic matter on the surface, or to make the inner inorganic matter film uneven and coat the surface with organic matter. Good. Since the outer packaging material often has a weld layer on the inner surface side, it is preferable that the weld layer has a protruding shape when the heat insulation performance between the outer packaging material and the core material is improved. When the weld layer portion is made of a thermoplastic resin, it is particularly easy to form protrusions.

  Moreover, this invention which solves the said subject is the heat insulation box which employ | adopted said vacuum heat insulating material, or an apparatus using the same. By adopting the above vacuum heat insulating material, it is possible to provide a device with a reduced amount of heat leakage. The target devices are, for example, a refrigerator, a water heater, an electric water heater, a hot tub, an inverter module, a solar heat collecting device, and the like, and can insulate the thermal influence of the entire device or a heat generating part inside the device. As a result, it is possible to reduce power consumption.

  According to the said structure, the vacuum heat insulating material with small heat conductivity can be provided by aiming at the increase in contact thermal resistance. Further, by using a vacuum heat insulating material for the device, it is possible to provide an energy saving device that cuts off the heat effect and reduces the power consumption.

  The structural example of the conventional vacuum heat insulating material and the vacuum heat insulating material of this invention is demonstrated with reference to drawings. FIG. 1 is a diagram showing a configuration of a conventional vacuum heat insulating material. As shown in FIG. 1 (a), the vacuum heat insulating material covers the core material and the getter agent that removes moisture and gas with an outer packaging material, and a part of the outer packaging material is fixed by welding or the like to form a bag shape. It has a configuration in which the inside is depressurized and sealed. As shown in FIG. 1B, as the outer packaging material, a weld layer for forming a bag shape from the inner surface side, a gas barrier layer for blocking water and gas, and an overcoat layer for protecting the gas barrier layer from impact are formed. Has been.

  On the other hand, FIG. 2 is a figure which shows the structure of the vacuum heat insulating material of this invention. As shown in FIG.2 (b), it is the example which made the inner surface side of the outer packaging material and the surface of the welding layer uneven | corrugated shape. The heat conduction of the vacuum heat insulating material is expressed as the sum of the heat conduction of the solid inside the outer packaging material and the heat conduction of the gas. Since the inside of the vacuum heat insulating material is depressurized, the heat conduction of the gas is almost negligible, so the heat conduction of the solid is important. In the conventional vacuum heat insulating material, since the outer packaging material and the core material, or the outer packaging material and the device to be kept warm are in contact with each other, the heat conduction of the vacuum heat insulating material is increased. In the present invention, protrusions are provided on the surface of the outer packaging material to reduce the contact area, thereby reducing the thermal conductivity. Thus, the protrusion formed on the surface of the outer packaging material increases the contact thermal resistance between the core material and the outer packaging material, and can reduce the thermal conductivity of the vacuum heat insulating material. The core material is preferably an inorganic fiber that does not contain a binder, such as glass wool.

  As the outer packaging material, a laminate material in which an organic film is bonded to the entire surface of the gas barrier layer with an adhesive as currently used is preferable. For example, an aluminum foil, aluminum vapor deposition, an ethylene-vinyl alcohol copolymer resin film, a polyester film or the like is bonded as a gas barrier layer, and a nylon film is bonded to the overcoat layer. Examples of the organic resin having a high gas barrier property include polyvinyl alcohol (PVA), polyethylene vinyl alcohol (EVOH), and polyvinylidene chloride (PVDC). Moreover, nylon etc. are used for the outer layer (overcoat layer) of an outer packaging material.

  High density polyethylene, low density polyethylene, unstretched polypropylene, or the like is used as a weld layer for the outer packaging material. Further, it is also desired to apply a vacuum material to a portion that is at a high temperature (100 ° C. or higher), and it is desirable to use biaxially oriented polypropylene (CPP) as a weld layer in the high temperature portion.

  As the core material, inorganic fibers are preferably used. The inorganic fiber core material is preferably glass wool. Thermal conductivity and cost vary greatly depending on the average fiber diameter of glass wool. What has an average fiber diameter of 3-5 micrometers is preferable from the surface of thermal conductivity and cost. With this fiber diameter, the heat flow path becomes zigzag, and the thermal resistance can be increased and the thermal conductivity can be lowered other than the contact resistance. Moreover, what does not contain the binder binder is preferable. This is to prevent outgassing from the binder and increase the thermal conductivity. Moreover, organic resin fibers, such as a polyethylene terephthalate fiber, can also be used.

  By using the getter agent after drying, moisture and gas components can be removed after sealing under reduced pressure. As a result, the degree of vacuum is maintained and it contributes to the reduction of thermal conductivity. Molecular sieves, silica gels, calcium oxides, synthetic zeolites, activated carbons and the like may be mentioned, and these may be used in a suitable mixture. In particular, a hydrophobic molecular sieve that is difficult to adsorb moisture from the outside again is preferable.

  The protrusion provided on the surface of the outer packaging material is provided on a portion of the inner surface that comes into contact with the core material, or on a contact surface of the outer surface with the heat generating portion or the heat retaining portion to be insulated. Forming with an organic material is preferable because it is easy to form. In particular, when the protrusion is formed on the inner surface side, it is preferable to form the protrusion with the same material as the weld layer. In order to improve the heat insulation performance, the length is preferably 30 μm or more.

  The shape of the protrusion is not particularly limited as long as the contact area can be reduced, and examples thereof include a quadrangular prism, a quadrangular pyramid, a cylinder, and a cone. It is appropriate that the formed protrusions have such a size that the shape can be confirmed with an optical microscope, a scanning electron microscope, or the like.

  The number of protrusions formed on the outer packaging material surface can be arbitrarily set according to the material and size of the protrusions. For example, when the contact area when the protrusion is not formed is 100, if the contact area after forming the protrusion is 1 to 50, sufficient heat insulation performance can be expected.

  The protrusions on the surface of the outer packaging material may be formed in any way, and can be obtained by processing the surface of the outer packaging material or using a substrate having irregularities. For example, as a processing method for forming irregularities on the outermost layer made of an organic material, a conventional outer packaging material is prepared by laminating or the like, and then a mold material processed into a predetermined shape is placed on the outer packaging material surface, and is subjected to thermocompression bonding. It is possible to form. The temperature at the time of thermocompression bonding varies depending on the material to be processed. Other processing methods include embossing. In addition, a method of removing a mask after forming a projection with a predetermined shape on the surface of the outer packaging material, forming a protrusion using printing, sputtering, or the like is also included.

  The said vacuum heat insulating material is used for the heat insulation box which has a to-be-heated part and the heat insulation member for maintaining the temperature state of a to-be-heated part. The said heat insulation member consists of a vacuum heat insulating material of this invention. In particular, it is preferable to use it for all devices having a heat exchanging part and requiring heat insulation. When a vacuum heat insulating material is disposed, it is preferable that the protrusion of the vacuum heat insulating material be parallel to the heat diffusion direction of the heat retaining portion.

The heat insulating box is used for, for example, a device that holds cold air such as a refrigerator or a freezer, or a heat generator such as a hot water heater or a heat insulating bathtub or a device that keeps a high temperature part warm. In addition, it can also be used for water heaters, electric water heaters, and hot tubs. FIG. 3 is an example used around the refrigerator interior space, FIG. 4 is an example used around the interior space of the water heater, and FIG. 5 is an example used around the interior space of the electric water heater. FIG. 6 is an example in which the use portion is provided around the heat insulation bathtub.
〔Example〕
In this embodiment, an example will be described in which protrusions are formed on the inner surface side of the outer packaging material to improve the heat insulation performance between the core material and the outer packaging material. When the protrusions are formed on the inner surface side of the outer packaging material, the gas barrier layer or the like may be provided with irregularities, but in this embodiment, the weld layer has an irregular shape. As described above, when the welding layer is made of a thermoplastic resin, the welding performance is high and the formation of the protrusions is relatively easy.

  The vacuum heat insulating materials used in the examples and comparative examples will be described in detail below. The present inventors made the outer packaging materials of Examples 1 to 4 of the present invention and the outer packaging materials of Comparative Examples 1 and 2, and confirmed the respective performances.

  As an outer packaging material of the present invention, a nylon film (thickness 15 μm), an aluminum vapor-deposited polyethylene terephthalate (thickness 12 μm), an ethylene vinyl alcohol copolymer film (thickness 15 μm), and a high-density polyethylene film (thickness 100 μm) are laminated. A mold having a quadrangular prism shape formed on the high-density polyethylene side of the outer packaging material thus produced was thermocompression-bonded to produce an outer packaging material having a quadrangular prism-shaped protrusion on the surface. When the length of the formed protrusion was observed with an optical microscope, it was 50 μm. The contact area with the glass wool was arranged to be 50 with 100 as the case where no protrusion was formed.

  The vacuum heat insulating material is installed in a vacuum chamber after inserting three sides of the outer packaging material with a heat sealer, inserting glass wool with an average fiber diameter of 3 μm (size: 250 mm × 250 mm × 100 mm) and a molecular sieve as a getter agent. Then, the vacuum pump of the vacuum packaging machine was evacuated for 10 minutes and the diffusion pump for 10 minutes until the pressure in the chamber reached 1.3 Pa. Then, the edge part was sealed by heat sealing.

  The thermal conductivity of the vacuum heat insulating material (thickness: about 10 mm) thus obtained was measured. The thermal conductivity was 1.5 mW / m · K, which was smaller than that in the case of using the outer packaging material that does not form the protrusions described in Comparative Example 1.

(Refrigerator example using vacuum heat insulating material Example 1)
The vacuum heat insulating material Example 1 was inserted into the heat insulating part of the refrigerator and used in the refrigerator box. Compared to the case where no vacuum heat insulating material is provided, the power consumption is reduced by about 15%. Moreover, by using the vacuum heat insulating material, the heat insulating layer can be made thinner than the conventional heat insulating material, and the space in the cabinet can be widened with respect to the device volume.

  As an outer packaging material of the present invention, a nylon film (thickness 15 μm), an aluminum vapor-deposited polyethylene terephthalate (thickness 12 μm), an ethylene vinyl alcohol copolymer film (thickness 15 μm), and a high-density polyethylene film (thickness 50 μm) are laminated. A mold having a quadrangular pyramid shape formed on the high-density polyethylene side of the outer packaging material produced in this way was thermocompression bonded to produce an outer packaging material having a quadrangular pyramidal projection on the surface. When the length of the formed protrusion was observed with an optical microscope, it was 30 μm. The contact area with glass wool was set to 10 when 100 was not formed as a protrusion.

  The vacuum heat insulating material was heat-sealed with a heat sealer on the three sides of the outer packaging material, glass wool with an average fiber diameter of 3 μm (size: 250 mm x 250 mm x 100 mm) and a molecular sieve as a getter agent were inserted into the vacuum chamber. Then, the vacuum pump of the vacuum packaging machine was evacuated for 10 minutes and the diffusion pump for 10 minutes until the pressure in the chamber reached 1.3 Pa. Then, the edge part was sealed by heat sealing.

  The thermal conductivity of the vacuum heat insulating material (thickness: about 10 mm) thus obtained was measured. The thermal conductivity was 1.4 mW / m · K, which was smaller than that in the case of using the outer packaging material that does not form the protrusions described in Comparative Example 1.

(Refrigerator example using vacuum heat insulating material Example 2)
The vacuum heat insulating material Example 2 was inserted into the heat insulating part of the refrigerator and used in the refrigerator box. Compared to the case where no vacuum heat insulating material is provided, the power consumption is reduced by about 15%. Moreover, by using the vacuum heat insulating material, the heat insulating layer can be made thinner than the conventional heat insulating material, and the space in the cabinet can be widened with respect to the device volume.

  As an outer packaging material of the present invention, a nylon film (thickness 15 μm), aluminum vapor-deposited polyethylene terephthalate (thickness 12 μm), an ethylene vinyl alcohol copolymer film (thickness 15 μm), and unstretched polypropylene (thickness 100 μm) are laminated. A mold having a cylindrical shape formed on the high-density polyethylene side of the produced outer packaging material was thermocompression bonded to produce an outer packaging material having a cylindrical projection on the surface. When the length of the formed protrusion was observed with an optical microscope, it was 50 μm. The contact area with the glass wool was arranged to be 50 with 100 as the case where no protrusion was formed.

  The vacuum insulation material is heat-sealed on the three sides of the outer packaging material, and glass wool (size: 250 mm x 250 mm x 100 mm) with an average fiber diameter of 5 μm and a molecular sieve as a getter agent are inserted into the vacuum chamber and placed in a vacuum chamber. Then, the vacuum pump of the vacuum packaging machine was evacuated for 10 minutes and the diffusion pump for 10 minutes until the pressure in the chamber reached 1.3 Pa. Then, the edge part was sealed by heat sealing.

  The thermal conductivity of the vacuum heat insulating material (thickness: about 10 mm) thus obtained was measured. The thermal conductivity was 1.5 mW / m · K, which was smaller than that in the case of using the outer packaging material that does not form the protrusions described in Comparative Example 1.

(Example of water heater and electric water heater using vacuum insulation material Example 3)
The vacuum heat insulating material produced in Example 3 was disposed and used on the side of the hot water storage tank of the water heater.

  Compared with the case where no vacuum heat insulating material is provided, the power consumption is reduced by about 5%. Further, by using a vacuum heat insulating material, the heat insulating layer can be made thinner than the conventional heat insulating material, and the capacity of the hot water storage tank can be increased with respect to the device volume.

  Furthermore, the vacuum heat insulating material produced in Example 3 was arrange | positioned and used for the hot water storage tank side part of an electric water heater. Compared with the case where no vacuum heat insulating material is provided, the power consumption is reduced by about 5%. Further, by using a vacuum heat insulating material, the heat insulating layer can be made thinner than the conventional heat insulating material, and the capacity of the hot water storage tank can be increased with respect to the device volume.

  As an outer packaging material of the present invention, a nylon film (thickness 15 μm), an aluminum vapor-deposited polyethylene terephthalate (thickness 12 μm), an ethylene vinyl alcohol copolymer film (thickness 15 μm), and a high-density polyethylene film (thickness 100 μm) are laminated. A mold having a conical shape on the high density polyethylene side of the outer packaging material produced in this manner was thermocompression bonded to produce an outer packaging material having conical protrusions on the surface. When the length of the formed protrusion was observed with an optical microscope, it was 50 μm. The contact area with glass wool was set to 1 when 100 was not formed as a protrusion.

  The vacuum heat insulating material was heat-sealed with a heat sealer on the three sides of the outer packaging material, glass wool with an average fiber diameter of 3 μm (size: 250 mm x 250 mm x 100 mm) and a molecular sieve as a getter agent were inserted into the vacuum chamber. Then, the vacuum pump of the vacuum packaging machine was evacuated for 10 minutes and the diffusion pump for 10 minutes until the pressure in the chamber reached 1.3 Pa. Then, the edge part was sealed by heat sealing.

  The thermal conductivity of the vacuum heat insulating material (thickness: about 10 mm) thus obtained was measured. The thermal conductivity was 1.0 mW / m · K, which was smaller than that in the case of using the outer packaging material that does not form the protrusions described in Comparative Example 1.

(Refrigerator example using vacuum heat insulating material Example 4)
The vacuum heat insulating material Example 4 was inserted into the heat insulating part of the refrigerator and used in the refrigerator box. Compared with the case where no vacuum heat insulating material is provided, the power consumption is reduced by about 20%. Moreover, by using the vacuum heat insulating material, the heat insulating layer can be made thinner than the conventional heat insulating material, and the space in the cabinet can be widened with respect to the device volume.

[Comparative Example 1]
As the outer packaging material of Comparative Example 1, a nylon film (thickness 15 μm), aluminum vapor-deposited polyethylene terephthalate (thickness 12 μm), ethylene vinyl alcohol copolymer film (thickness 15 μm), and high-density polyethylene film (thickness 100 μm) are laminated. The outer packaging material produced in this way was used.

  The vacuum heat insulating material was heat-sealed with a heat sealer on the three sides of the outer packaging material, glass wool with an average fiber diameter of 3 μm (size: 250 mm x 250 mm x 100 mm) and a molecular sieve as a getter agent were inserted into the vacuum chamber. Then, the vacuum pump of the vacuum packaging machine was evacuated for 10 minutes and the diffusion pump for 10 minutes until the pressure in the chamber reached 1.3 Pa. Then, the edge part was sealed by heat sealing.

  The heat conductivity of the vacuum heat insulating material (thickness: about 10 mm) thus obtained was measured and found to be 2.5 mW / m · K.

[Comparative Example 2]
As an outer packaging material of Comparative Example 2, a nylon film (thickness 15 μm), an aluminum-deposited polyethylene terephthalate (thickness 12 μm), an ethylene vinyl alcohol copolymer film (thickness 15 μm), and an unstretched polypropylene (thickness 100 μm) are laminated. The outer packaging material produced in this way was used.

  The vacuum insulation material is heat-sealed on the three sides of the outer packaging material, and glass wool (size: 250 mm x 250 mm x 100 mm) with an average fiber diameter of 5 μm and a molecular sieve as a getter agent are inserted into the vacuum chamber and placed in a vacuum chamber. Then, the vacuum pump of the vacuum packaging machine was evacuated for 10 minutes and the diffusion pump for 10 minutes until the pressure in the chamber reached 1.3 Pa. Then, the edge part was sealed by heat sealing.

  The heat conductivity of the vacuum heat insulating material thus obtained (thickness: about 10 mm) was measured. The heat conductivity was 2.6 mW / m · K.

  Table 1 shows the configurations of the vacuum heat insulating materials of Examples 1 to 4 and Comparative Examples 1 and 2, the shape of the protrusions formed on the outer packaging material surface, the contact area, and the initial thermal conductivity.

  The thermal conductivity of the vacuum heat insulating materials of Examples and Comparative Examples was measured under the condition of 20 ° C. using AUTO-Λ manufactured by Eihiro Seiki Co., Ltd. As is apparent from a comparison between Comparative Example 1 and Examples 1, 2, 4, Comparative Example 2 and Example 3, the thermal conductivity could be lowered by forming protrusions.

  Next, the shape and contact area of the protrusions formed on the outer packaging material surface were examined. As is clear from Example 1 and Example 4, even if the protrusions had the same height, the thermal conductivity could be lowered by reducing the contact area as a conical shape. Further, the thermal conductivity changed more greatly when the height of the protrusion was changed than the contact area.

  Further, in the above vacuum heat insulating material, the protrusion is formed on the inner surface of the outer packaging material to reduce the contact surface between the outer packaging material and the core material, but the protrusion is formed on the outer surface side of the outer packaging material (side of the device to be insulated). It may be formed. Even if the protrusion is formed on the outer surface side, the thermal conductivity is greatly reduced, but since it is not in a vacuum state, the effect of lowering the thermal conductivity compared to the inner surface side is small.

The cross-sectional schematic diagram of the conventional vacuum heat insulating material. The cross-sectional schematic diagram of this invention vacuum heat insulating material. The schematic diagram of this invention outer packaging material. The schematic diagram of this invention outer packaging material. The refrigerator provided with the vacuum heat insulating material of this invention. The water heater provided with the vacuum heat insulating material of this invention. The electric water heater provided with the vacuum heat insulating material of this invention. The heat insulation bathtub provided with this invention vacuum heat insulating material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Conventional vacuum heat insulating material 2 Conventional outer packaging material 3 Glass wool 4 Getter agent 5 Welding layer 6 Aluminum vapor deposition polyethylene terephthalate film 7 Ethylene vinyl copolymer film 8 Nylon film 9 Invention vacuum heat insulating material 10 Invention outer packaging material 11 Cylindrical protrusion 12 Square pillar Upper projection 13 Rigid urethane foam 14 Box 15 Refrigerator box 16 Hot water storage tank 17 Relief valve 18 Leakage breaker 19 Relief valve operation valve 20 Drainage operation valve 21 Drainage pipe 22 Main plug 23 Water supply pipe 24 Water stoppage valve 25 Hot water supply pipe 26 Heat pump unit 27 Hot Water Storage Tank Unit 28 Bathtub

Claims (9)

A vacuum heat insulating material having an outer packaging material having a gas barrier property and a core material made of inorganic fibers covered with the outer packaging material, wherein the inside of the outer packaging material is decompressed,
The outer material may have a projection made of length 30μm or more organic compound on the surface,
When the area of the surface of the core material facing the outer packaging material is 100, the contact surface between the core material and the outer packaging material is 1-50 in the contact surface with the core material of the outer packaging material. The vacuum heat insulating material characterized by the protrusion being arrange | positioned . 2. The vacuum heat insulating material according to claim 1, wherein the shape of the protrusion is any one of a quadrangular prism, a quadrangular pyramid, a cylinder, and a cone. 2. The vacuum heat insulating material according to claim 1, wherein the shape of the protrusion is a cone shape. A vacuum heat insulating material according to any of claims 1 to 3, the vacuum heat insulating material, characterized in that projections on the surface opposite to the core material before Kigaitsutsumizai is formed. A vacuum heat insulating material according to any of claims 1 to 4, wherein the outer material is made of a laminate material of a thin film of a metal thin film and an organic substance, wherein the projection is made of the same organic material as a thin film of the organic material Vacuum insulation characterized by that. A vacuum heat insulating material according to any of claims 1 to 5, wherein the outer material has a welding layer made of organic material, the projection is characterized by consisting of the same material as the welding layer vacuum Insulation. A vacuum heat insulating material according to any one of claims 1 to 6 ,
The vacuum heat insulating material, wherein the core material is glass wool having an average fiber diameter of 3 to 5 μm. The vacuum heat insulating material according to any one of claims 1 to 7 ,
The outer packaging material has an aluminum foil layer or an organic film layer on which aluminum is vapor-deposited, and a welded layer made of polyethylene, and the polyethylene layer has protrusions. A heat insulation box having a heat insulation part and a heat insulation member that maintains the temperature state of the heat insulation part,
The said heat insulation member is a vacuum heat insulating material as described in any one of Claim 1 thru | or 8 , The heat insulation box characterized by the above-mentioned.

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