JPWO2018042612A1 - Vacuum insulation and insulation box - Google Patents

Abstract

The vacuum heat insulating material according to the present invention is a vacuum heat insulating material that includes a core material and an outer packaging material that covers the core material, and the inside of the outer packaging material is in a reduced pressure state. The laminated film having a gas barrier layer, the outer packaging material has two surfaces facing the thickness direction of the vacuum heat insulating material in a range facing the core material, and constitutes the two surfaces When the outer packaging material portion is defined as a core material covering portion, the gas barrier layer is present only in the core material covering portion.

Description

  The present invention relates to a vacuum heat insulating material that maintains heat insulating performance and a heat insulating box including the vacuum heat insulating material.

  A conventional vacuum heat insulating material used as a heat insulating material for a refrigerator or the like includes a core material that holds a vacuum space and an outer packaging material that covers the core material, and the inside of the outer packaging material is in a reduced pressure state. Yes. And a vacuum heat insulating material is maintained at low heat conductivity by maintaining an inside with a vacuum with an outer packaging material. For this reason, the outer packaging material of the conventional vacuum heat insulating material reduces the invasion of gas such as water vapor and air into the outer packaging material from the outside of the outer packaging material, and keeps the thermal conductivity low over a long period of time. A gas barrier layer is provided over the entire area. The gas barrier layer is composed of a metal foil, a metal vapor deposition layer, or a metal oxide vapor deposition layer (see, for example, Patent Document 1).

JP2015-104704A

  When manufacturing a vacuum heat insulating material, first, an outer packaging material is formed in a bag shape in which a part of the outer peripheral portion is opened. Specifically, the outer packaging material of the vacuum heat insulating material includes a heat fusion layer on one surface. Then, one outer packaging material is folded so that the heat-sealing layer is disposed on the inner side, or two outer packaging materials are overlapped so that the heat-sealing layer faces each other, and the outer periphery is heat-sealed. By fusing the layers by heat sealing or the like to form a sealing portion, the outer packaging material is formed in a bag shape with a part of the outer peripheral portion opened. Thereafter, a core material is inserted into the outer packaging material, the inside of the outer packaging material is decompressed, and then the opening is fused by heat sealing or the like to form a sealing portion, thereby completing the vacuum heat insulating material.

  For this reason, the sealing part which does not cover a core material is formed in the outer peripheral side of a core material in a vacuum heat insulating material. Since the sealing portion of the outer packaging material does not contribute to heat insulation, the vacuum heat insulating material may be used with the sealing portion being bent along the shape of the core material.

  For example, the vacuum heat insulating material used for heat insulation boxes, such as a refrigerator, may be used together with a urethane foam heat insulating material. At this time, in order to secure a filling flow path of the urethane foam heat insulating material, the sealing portion of the outer packaging material may be bent along the shape of the core material and a vacuum heat insulating material may be used. At the end of the vacuum heat insulating material where the sealing portion of the outer packaging material is bent, heat entrainment by the outer packaging material, that is, a thermal bridge (heat bridge) occurs. For this reason, the effective thermal conductivity which shows the heat insulation performance as the whole vacuum heat insulating material increases.

In general, the effective thermal conductivity λeff in consideration of the thermal bridge (heat bridge) at the end of the vacuum heat insulating material can be obtained by the following equation (1).
λeff = λcop + ψ (d) × d × p ÷ A (1)
Note that λ cop is the thermal conductivity at a position that becomes the center of the vacuum heat insulating material when the vacuum heat insulating material is observed in the thickness direction, which is the heat insulating direction. In other words, λ cop is the thermal conductivity at a position that becomes the central portion of the core material when the vacuum heat insulating material is observed in the thickness direction, which is the heat insulating direction. ψ (d) is the thermal conductivity of the outer packaging material portion that does not cover the core material, such as the sealing portion. d is the thickness of the vacuum heat insulating material. p is the circumference of the vacuum heat insulating material when the vacuum heat insulating material is observed in the thickness direction which is the heat insulating direction. A is the area of the vacuum heat insulating material when the vacuum heat insulating material is observed in the thickness direction which is the heat insulating direction.

  Here, as in Patent Document 1, when a gas barrier layer composed of a metal foil, a metal vapor-deposited layer, or a metal oxide vapor-deposited layer is provided over the entire area of the outer packaging material, the inside of the outer packaging material from the outside of the outer packaging material It is possible to reduce the intrusion of gas such as water vapor and air, and to maintain the thermal conductivity of the central portion of the vacuum heat insulating material low over a long period of time. However, as in Patent Document 1, when a gas barrier layer composed of a metal foil, a metal vapor-deposited layer, or a metal oxide vapor-deposited layer is provided throughout the outer packaging material, the thermal conductivity of the sealing portion of the outer packaging material Therefore, there is a problem that the effective thermal conductivity increases and the heat insulation performance decreases.

  The present invention has been made to solve the above-described problems, and reduces the invasion of gas such as water vapor and air into the outer packaging material from the outside of the outer packaging material, and is a vacuum heat insulating material over a long period of time. It is a first object of the present invention to provide a vacuum heat insulating material capable of maintaining a low effective thermal conductivity while maintaining a low thermal conductivity at the center of the glass, that is, maintaining a high thermal insulation performance over a long period of time. To do. A second object is to provide a heat insulating box provided with the vacuum heat insulating material.

  The vacuum heat insulating material according to the present invention is a vacuum heat insulating material that includes a core material and an outer packaging material that covers the core material, and the inside of the outer packaging material is in a reduced pressure state. The laminated film having a gas barrier layer, the outer packaging material has two surfaces facing the thickness direction of the vacuum heat insulating material in a range facing the core material, and constitutes the two surfaces When the outer packaging material portion is defined as a core material covering portion, the gas barrier layer is present only in the core material covering portion.

  The vacuum heat insulating material which concerns on this invention has a gas barrier layer in the core material coating | coated part of an outer packaging material. For this reason, the vacuum heat insulating material according to the present invention can reduce the intrusion of gas such as water vapor and air from the outside of the outer packaging material into the outer packaging material, and the thermal conductivity of the central portion of the vacuum heat insulating material over a long period of time. Can be kept low. Moreover, the vacuum heat insulating material which concerns on this invention does not have a gas barrier layer in ranges other than a core material coating | coated part. For this reason, the vacuum heat insulating material which concerns on this invention can make small the thermal conductivity of the outer packaging material of the range other than a core material coating | coated part, and can also maintain an effective thermal conductivity low. Therefore, the vacuum heat insulating material according to the present invention can maintain high heat insulating performance over a long period of time.

It is sectional drawing which shows schematic structure of the vacuum heat insulating material which concerns on Embodiment 1 of this invention. In the vacuum heat insulating material which concerns on Embodiment 1 of this invention, it is sectional drawing which shows the state which bent the core material non-coating part. It is sectional drawing which shows schematic structure of the heat insulation box which concerns on Embodiment 2 of this invention.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing a schematic configuration of a vacuum heat insulating material according to Embodiment 1 of the present invention. In the vacuum heat insulating material 1 shown in FIG. 1, the vertical direction of the paper surface is the thickness direction, that is, the heat insulating direction. Further, in FIG. 1, hatching of the base material layer 42 of the outer packaging material 4 is omitted so that the drawing can be easily seen.
Hereinafter, based on FIG. 1, the vacuum heat insulating material 1 which concerns on this Embodiment 1 is demonstrated. In the following drawings including FIG. 1, the dimensional relationship and shape of each component may differ from the actual one. Specific dimensions and the like of each component should be determined in consideration of the following description.

  As shown in FIG. 1, the vacuum heat insulating material 1 is a heat insulating material which implement | achieves low thermal conductivity by maintaining an inside in a vacuum. The vacuum heat insulating material 1 includes a core material 2 and an outer packaging material 4 that covers the core material 2. As will be described later, the vacuum space defined by the outer packaging material 4 is formed by heat-sealing the opening by heat sealing or the like in a state where the inside of the bag-shaped outer packaging material 4 partially opened is decompressed. Is done. That is, the inside of the outer packaging material 4 is in a reduced pressure state. The vacuum heat insulating material 1 has a substantially rectangular flat plate shape as a whole when observed in the direction of arrow Z in FIG. In the first embodiment, the vacuum heat insulating material 1 also includes an adsorbent 3 that adsorbs moisture inside the outer packaging material 4. That is, in the vacuum heat insulating material 1 according to the first embodiment, the core material 2 and the adsorbent 3 are covered with the outer packaging material 4.

  The core material 2 is used for the purpose of maintaining a vacuum space. As the core material 2, it is common to use a fiber assembly such as glass wool. Further, the fiber aggregate constituting the core material 2 may be one formed by heat and pressure molding, hermetically sealed using an inner packaging material, or one bound with a binder. There may be.

  The adsorbent 3 is used for the purpose of suppressing the increase in thermal conductivity by adsorbing water vapor inside the vacuum heat insulating material 1 and maintaining the degree of vacuum. As the adsorbent 3, it is common to use calcium oxide (CaO). Further, the adsorbent 3 may be silica gel or zeolite. Further, the adsorbent 3 may be a combination of at least two of calcium oxide, silica gel, and zeolite.

  Further, the adsorbent 3 may be packaged with a packaging material having air permeability. The breathable packaging material is made of a breathable member selected from paper, non-woven fabric, plastic film, or mesh cloth. By packaging the adsorbent 3 with a packaging material, it is possible to expect improvement in workability when the adsorbent 3 is disposed inside the outer packaging material 4. The packaging material may be a laminate of two or more members selected from these air-permeable members.

  The outer packaging material 4 is a laminated film having a multilayer structure in which a plurality of layers are laminated. The outer packaging material 4 according to the first embodiment is configured by sequentially laminating a surface protective layer 41, a base material layer 42, a gas barrier layer 44, and a heat sealing layer 43. Cover the core material 2 and the adsorbent 3 with the two outer packaging materials 4 so that the heat seal layers 43 face each other, and heat the heat seal layers 43 on the outer peripheral side of the core material 2 and the adsorbent 3. The outer packaging material 4 covers the core material 2 and the adsorbent 3 by heat sealing with a seal or the like to form the sealing portion 43a. At this time, the space inside the outer packaging material 4, that is, the space between the two outer packaging materials 4, is in a state where the pressure is reduced to a degree of vacuum of about 1 Pa (Pascal) to 3 Pa.

  Here, in the vacuum heat insulating material 1 which concerns on this Embodiment 1, as shown in FIG. 1, the thickness direction of the vacuum heat insulating material 1 which is a heat insulation direction in the range in which the outer packaging material 4 has opposed the core material 2 is shown. Has two surfaces facing each other. The two surfaces are surfaces that are an upper surface and a lower surface in FIG. These two surfaces are arranged substantially in parallel. In the first embodiment, the portion of the outer packaging material 4 constituting these two surfaces is defined as the core material covering portion 5. One of these two surfaces (for example, the upper surface in FIG. 1) is a surface facing the heat source or space on the high temperature side. In addition, the other of these two surfaces (for example, the lower surface in FIG. 1) is a surface facing a low-temperature heat source or space. In other words, the range constituting the surface perpendicular to the thickness direction of the vacuum heat insulating material 1, which is the heat insulating direction, of the portion facing the core material 2 in the outer packaging material 4 is the core material covering portion 5. Further, a range other than the core material covering portion 5 in the outer packaging material 4 is defined as a core material non-covering portion 6. That is, the range which comprises the surface (side surface of FIG. 1) which connects two surfaces used as the core material coating | coated part 5 among the parts facing the core material 2 in the outer packaging material 4 becomes the core material non-coating part 6. . Further, the sealing portion 43 a of the outer packaging material 4 becomes the core material non-covering portion 6. When defined in this way, in the vacuum heat insulating material 1 according to the first exemplary embodiment, the gas barrier layer 44 exists only in the core material covering portion 5. Here, it has been described above that the two surfaces serving as the core covering portion 5 are arranged in parallel, but the term “parallel” here is not parallel in a strict sense. Even when these two surfaces are slightly inclined and face each other due to a manufacturing error of the vacuum heat insulating material 1, they are referred to as parallel in the first embodiment.

  In the first embodiment, the gas barrier layer 44 is provided between the base material layer 42 and the heat sealing layer 43. However, the arrangement position of the gas barrier layer 44 is not limited to the position. For example, the gas barrier layer 44 may be provided between the surface protective layer 41 and the base material layer 42 or between the heat sealing layer 43 and the core material 2. A plurality of gas barrier layers 44 may be provided. In this case, at least two of the surface protective layer 41 and the base material layer 42, the base material layer 42 and the heat sealing layer 43, and the heat sealing layer 43 and the core material 2 are used. A gas barrier layer 44 may be provided therebetween. That is, the vacuum heat insulating material 1 according to Embodiment 1 includes the surface protective layer 41 and the base material layer 42, the base material layer 42 and the heat sealing layer 43, and the heat sealing layer 43. A gas barrier layer 44 may be provided between at least one of the core members 2.

  The surface protective layer 41 protects the surface of the vacuum heat insulating material 1 and is provided on the outer surface side of the base material layer 42. The film thickness of the surface protective layer 41 is 25 μm or the like. The material of the surface protective layer 41 is preferably a thermoplastic resin having a melting point of 150 ° C. or higher and excellent scratch resistance. For example, as the material of the surface protective layer 41, stretched polyamide such as stretched nylon, polyethylene terephthalate, stretched polypropylene, or the like can be used. Stretched nylon is abbreviated as ONY, polyethylene terephthalate is abbreviated as PET, and stretched polypropylene is sometimes abbreviated as OPP.

  The base material layer 42 may be made of a thermoplastic resin having excellent puncture resistance. The base material layer 42 is a single layer of such a thermoplastic resin, or is formed by laminating a plurality of such thermoplastic resins. For example, the base material layer 42 is formed as a single layer having a thickness of, for example, 24 μm. For example, the base material layer 42 is formed by laminating two layers having a film thickness of, for example, 12 μm. As a material for the base material layer 42, polyethylene terephthalate, ethylene vinyl alcohol, or a combination thereof may be used. Ethylene vinyl alcohol is sometimes abbreviated as EVOH.

  The heat sealing layer 43 is provided on the inner surface side of the base material layer 42. The film thickness of the heat sealing layer 43 is 30 μm or the like, and the film thickness of the sealing portion 43a formed by fusing the heat sealing layers 43 to each other is 60 μm or the like. As the heat sealing layer 43, for example, low density polyethylene, linear low density polyethylene, or the like is used. It is even better if it is a high-density polyethylene or non-stretched polypropylene having a high elastic modulus and excellent water vapor barrier properties. Low density polyethylene may be abbreviated as LDPE, linear low density polyethylene may be abbreviated as LLDPE, high density polyethylene may be abbreviated as HDPE, and unstretched polypropylene may be abbreviated as CPP. In the following description, the above abbreviations are described in parentheses.

  The gas barrier layer 44 reduces the entry of gas such as water vapor and air from the outside of the outer packaging material 4 into the outer packaging material 4 (that is, the space between the two outer packaging materials 4). The material of the gas barrier layer 44 is at least one of a metal foil layer, a metal vapor-deposited layer, and a metal oxide vapor-deposited layer excellent in water and air barrier properties. The metal used for the gas barrier layer 44 is, for example, aluminum. For example, the film thickness is 6 μm or the like for an aluminum foil layer, and the film thickness is 40 nm or the like for an aluminum vapor deposition layer. Aluminum oxide, silicon dioxide, or the like may be used for the vapor deposition layer.

Next, the manufacturing process of the vacuum heat insulating material 1 which concerns on this Embodiment 1 is demonstrated.
In the manufacturing process of the vacuum heat insulating material 1 according to the first embodiment, first, the two outer packaging materials 4 are overlapped so that the heat sealing layer 43 faces each other. And the heat sealing layers 43 of the outer peripheral part except a part are melt | fused by heat seal etc., and the sealing part 43a is formed in the said position. Thereby, the outer packaging material 4 becomes a bag shape which a part of outer peripheral part opened.

Thereafter, the core material 2 is inserted into the outer packaging material 4 formed in a bag shape, and these are heat-treated at 100 ° C. for 2 hours. Thereby, moisture is removed from the core material 2 and the outer packaging material 4. Next, the adsorbent 3 is disposed between the core material 2 and the outer packaging material 4. Then, the inside of the outer packaging material 4 is depressurized to a degree of vacuum of about 1 Pa to 3 Pa, and the opening portion is fused by heat sealing or the like in the depressurized state to form the sealing portion 43 a, and the inside of the outer packaging material 4 is sealed under reduced pressure To do.
In addition, it is good also considering the outer packaging material 4 as a bag shape by bend | folding the outer packaging material 4 so that the heat-fusion layer 43 may be arrange | positioned inside. The number of outer packaging materials 4 is not limited as long as the core material 2 and the adsorbent 3 can be sealed under reduced pressure.

FIG. 2 is a cross-sectional view showing a state where the core non-covering portion is bent in the vacuum heat insulating material according to Embodiment 1 of the present invention. In FIG. 2, as in FIG. 1, the vertical direction of the paper surface is the thickness direction of the vacuum heat insulating material 1, that is, the heat insulating direction. In FIG. 2, hatching of the base material layer 42 of the outer packaging material 4 is omitted so that the drawing can be easily seen.
The opening is fused by heat sealing or the like to form the sealing portion 43 a, and the inside of the outer packaging material 4 is sealed under reduced pressure, and then the core material non-covering portion 6 of the outer packaging material 4 is bent along the shape of the core material 2. . Thereby, even when the vacuum heat insulating material 1 is used together with the urethane foam heat insulating material, the core material non-covering portion 6 can be prevented from blocking the filling flow path of the urethane foam heat insulating material, and the filling flow of the urethane foam heat insulating material can be prevented. A road can be secured.

  The vacuum heat insulating material 1 obtained through the above steps has a gas barrier layer 44 in the core material covering portion 5 of the outer packaging material 4, so that gas such as water vapor and air enters the outer packaging material 4 from the outside of the outer packaging material 4. Can be reduced, and the thermal conductivity of the central portion of the vacuum heat insulating material 1 can be kept low for a long time. Further, the vacuum heat insulating material 1 does not have the gas barrier layer 44 in the core material non-covering portion 6. More specifically, only the resin having a lower thermal conductivity than the gas barrier layer 44 is present in the core material non-covering portion 6. For this reason, the vacuum heat insulating material 1 can make the thermal conductivity of the core material non-coating part 6 small, and can maintain the effective thermal conductivity low. Therefore, the vacuum heat insulating material 1 can maintain high heat insulating performance over a long period of time.

  Next, the vacuum heat insulating material 1 of this Embodiment 1 was produced as Example 1-Example 3, and the comparison with Comparative Example 1-Comparative Example 3 was performed. The comparison results will be described below.

[Example 1]
In Example 1, the relationship between the amount of increase in the thermal conductivity of the vacuum heat insulating material 1 and the gas barrier layer 44 was examined. The vacuum heat insulating material 1 which concerns on Example 1 was set as the following structures. The core material 2 was composed of glass wool. Adsorbent 3 was composed of 50 g of calcium oxide (CaO). The surface protective layer 41 of the outer packaging material 4 was made of stretched nylon (ONY) having a film thickness of 25 μm. The base material layer 42 of the outer packaging material 4 was composed of 12 μm thick polyethylene terephthalate (PET) and 12 μm thick ethylene vinyl alcohol (EVOH). The heat-sealing layer 43 of the outer packaging material 4 was composed of linear low density polyethylene (LLDPE) having a film thickness of 30 μm. The gas barrier layer 44 of the outer packaging material 4 existing only in the core material covering portion 5 was configured as an aluminum foil layer having a film thickness of 6 μm. And the core material 2 and the adsorbent 3 were coat | covered with the outer packaging material 4, and the vacuum heat insulating material 1 which concerns on Example 1 was produced.

  The dimensions of the vacuum heat insulating material 1 were 20 mm in thickness, 500 mm in width, and 1500 mm in length. The thickness 20 mm of the vacuum heat insulating material 1 is the thickness of the vacuum heat insulating material 1 including the core material non-covered portion 6 in a state where the core material non-covered portion 6 of the outer packaging material 4 is bent along the shape of the core material 2. That is the dimension indicated by T in FIG. The width 500 mm of the vacuum heat insulating material 1 is the width of the vacuum heat insulating material 1 including the core material non-covered portion 6 in a state where the core material non-covered portion 6 of the outer packaging material 4 is bent along the shape of the core material 2. Yes, it is the dimension indicated by W in FIG. Further, the length of the vacuum heat insulating material 1 is 1500 mm in the length of the vacuum heat insulating material 1 including the core material non-covered portion 6 in a state where the core material non-covered portion 6 of the outer packaging material 4 is bent along the shape of the core material 2. This is the dimension of the vacuum heat insulating material 1 including the core material non-covering portion 6 in the direction orthogonal to the plane of FIG.

And the heat insulation of the center part of the vacuum heat insulating material 1 which concerns on Example 1 one day after preparation, and the vacuum heat insulating material which concerns on Example 1 after storing for 30 days in the atmosphere of 25 degreeC of air temperature, and 60% of relative humidity The thermal conductivity of the central part of 1 was measured, and the difference was calculated as the increase in thermal conductivity.
In addition, the thermal conductivity of the center part of the vacuum heat insulating material 1 is the thermal conductivity of the position which becomes the center part of the vacuum heat insulating material 1 when the vacuum heat insulating material 1 is observed in the thickness direction that is the heat insulating direction. Also in the following description, when it says that the heat conductivity of the center part of a vacuum heat insulating material, when observing a vacuum heat insulating material in the thickness direction which is a heat insulation direction, it represents the heat conductivity of the position used as the center part of a vacuum heat insulating material. Shall.

  The vacuum heat insulating material used in Comparative Example 1 does not have the gas barrier layer 44 provided in the vacuum heat insulating material 1 according to Example 1. Other configurations of the vacuum heat insulating material according to Comparative Example 1 are the same as those of the vacuum heat insulating material 1 according to Example 1. Similar to the vacuum heat insulating material 1 according to Example 1, also in the vacuum heat insulating material according to Comparative Example 1, the thermal conductivity of the central portion of the vacuum heat insulating material one day after the production, the atmosphere at 25 ° C. and the relative humidity 60%. The thermal conductivity of the central part of the vacuum heat insulating material after storage for 30 days was measured, and the difference was calculated as the increase in thermal conductivity.

  Table 1 shows a result of comparing the thermal conductivity of the central portion in the vacuum heat insulating material 1 according to Example 1 and the thermal conductivity of the central portion in the vacuum heat insulating material according to Comparative Example 1.

As shown in Table 1, in the vacuum heat insulating material 1 according to Example 1, the thermal conductivity of the central part 1 day after production is 1.8 mW / (m · K), and the thermal conductivity of the central part 30 days after production. The increase in rate was 0.3 mW / (m · K).
On the other hand, the vacuum heat insulating material according to Comparative Example 1 has a thermal conductivity of 2.0 mW / (m · K) at the central part after 1 day of production, and an increase in the thermal conductivity of the central part after 30 days of production. Was 2.4 mW / (m · K).
That is, the vacuum heat insulating material 1 according to Example 1 has a lower thermal conductivity of 0.2 mW / (m · K) in the central part one day after the production than the vacuum heat insulating material according to Comparative Example 1, and the production 30 The amount of increase in thermal conductivity in the central part after the day was 2.1 mW / (m · K) low.

  Thus, by having the gas barrier layer 44 in the core material covering portion 5 of the outer packaging material 4, the thermal conductivity of the central portion of the vacuum heat insulating material 1 could be kept low for a long time.

[Example 2]
In Example 2, the relationship between the thermal conductivity and the effective thermal conductivity of the core uncoated portion 6 was investigated. The vacuum heat insulating material 1 which concerns on Example 2 comprised the gas barrier layer 44 of the outer packaging material 4 which exists only in the core material coating | coated part 5 as an aluminum vapor deposition layer with a film thickness of 40 nm. Other configurations of the vacuum heat insulating material 1 according to the second embodiment are the same as those of the vacuum heat insulating material 1 according to the first embodiment.
And in the vacuum heat insulating material 1 which concerns on Example 2, the thermal conductivity of the center part and the thermal conductivity of the core material non-coating part 6 of the outer packaging material 4 were measured, and the effective thermal conductivity was calculated. The thermal conductivity of the core material non-covering portion 6 was measured at the sealing portion 43a of the outer packaging material 4.

In the vacuum heat insulating material according to Comparative Example 2, a gas barrier layer was provided also in the core material non-covering portion. That is, in the vacuum heat insulating material according to Comparative Example 2, the gas barrier layer is provided over the entire outer packaging material. Other configurations of the vacuum heat insulating material according to Comparative Example 2 are the same as those of the vacuum heat insulating material 1 according to Example 2. Two types of vacuum heat insulating materials according to Comparative Example 2 were prepared. The vacuum heat insulating material which concerns on the 1st comparative example 2 comprised the gas barrier layer provided over the whole outer packaging material as an aluminum foil layer with a film thickness of 6 micrometers. The vacuum heat insulating material which concerns on the 2nd comparative example 2 comprised the gas barrier layer provided over the whole outer packaging material as an aluminum vapor deposition layer with a film thickness of 40 nm.
And in each of the vacuum heat insulating materials which concern on the comparative example 2, the heat conductivity of the center part and the heat conductivity of the core material non-coating part of an outer packaging material were measured, and the effective heat conductivity was computed. In addition, the thermal conductivity of the core material non-covering part was measured at the sealing part of the outer packaging material.

Table 2 shows the result of comparing the effective thermal conductivity of the vacuum heat insulating material 1 according to Example 2 and the effective thermal conductivity of each of the vacuum heat insulating materials according to Comparative Example 2.
In addition, the circumference of the vacuum heat insulating material shown in Table 2 was calculated | required by following Formula (2).
Perimeter of vacuum insulation material = (width of vacuum insulation material + length of vacuum insulation material) × 2 (2)
Moreover, the area of the vacuum heat insulating material shown in Table 2 was calculated | required by following Formula (3).
Area of vacuum heat insulating material = width of vacuum heat insulating material × length of vacuum heat insulating material (3)
Moreover, the effective thermal conductivity of the vacuum heat insulating material shown in Table 2 was calculated | required by the above-mentioned Formula (1).

As shown in Table 2, each of the vacuum heat insulating material 1 according to Example 2 and the vacuum heat insulating material according to Comparative Example 2 has a thermal conductivity of 1.8 mW / (m · K) at the center after one day of production. Yes, equivalent.
Moreover, the vacuum heat insulating material 1 which concerns on Example 2 is 1.0 mW / (m * K) in the thermal conductivity of the core material non-coating part 6 of the outer packaging material 4, and an effective thermal conductivity is 1.9 mW / (. m · K).
On the other hand, in the vacuum heat insulating material according to Comparative Example 2 having the gas barrier layer of the aluminum foil layer, the thermal conductivity of the core material non-covering portion of the outer packaging material is 17.0 mW / (m · K), and the effective heat The conductivity was 3.6 mW / (m · K). Moreover, the vacuum heat insulating material which concerns on the comparative example 2 which has the gas barrier layer of an aluminum vapor deposition layer has the thermal conductivity of 7.0 mW / (m * K) of the core material non-coating part of an outer packaging material, and effective thermal conductivity is It was 2.5 mW / (m · K).

  That is, the vacuum heat insulating material 1 according to Example 2 in which the gas barrier layer 44 exists only in the core material covering portion 5 is compared with the vacuum heat insulating material according to Comparative Example 2 in which the gas barrier layer is provided over the entire outer packaging material. The effective thermal conductivity could be lowered by 0.6 mW / (m · K) to 1.7 mW / (m · K).

[Example 3]
The vacuum heat insulating material 1 according to Example 3 is obtained by storing the vacuum heat insulating material 1 according to Example 2 for 30 days in an atmosphere having a temperature of 25 ° C. and a relative humidity of 60%. In the vacuum heat insulating material 1 which concerns on Example 3, the thermal conductivity of the center part and the thermal conductivity of the core material non-coating part 6 of the outer packaging material 4 were measured, and the effective thermal conductivity was calculated.
Moreover, the vacuum heat insulating material which concerns on the comparative example 3 each stores the vacuum heat insulating material which concerns on the comparative example 2 for 30 days in the atmosphere of 25 degreeC of air temperature, and 60% of relative humidity. In each of the vacuum heat insulating materials according to Comparative Example 3, the thermal conductivity of the central portion and the thermal conductivity of the core material non-covering portion of the outer packaging material were measured, and the effective thermal conductivity was calculated.

  Table 3 shows the result of comparing the effective thermal conductivity of the vacuum heat insulating material 1 according to Example 3 and the effective thermal conductivity of each of the vacuum heat insulating materials according to Comparative Example 3. In other words, Table 3 compares the effective thermal conductivity of the vacuum heat insulating material 1 according to Example 2 after 30 days of production with the effective thermal conductivity of each of the vacuum heat insulating materials according to Comparative Example 2 after 30 days of production. It is the result.

  As shown in Table 3, the vacuum heat insulating material 1 according to Example 3 has a thermal conductivity of 0.2 mW / (m · K) at the center 30 days after the preparation, compared with the vacuum heat insulating material according to Comparative Example 3. ) To 0.3 mW / (m · K) higher. However, the vacuum heat insulating material 1 according to Example 3 has an effective thermal conductivity of 0.4 mW / (m · K) to 1.4 mW / (30 days after production compared to the vacuum heat insulating material according to Comparative Example 3. m · K) was able to be lowered.

  As described above, the vacuum heat insulating material 1 according to the first exemplary embodiment includes the core material 2 and the outer packaging material 4 covering the core material 2, and the inside of the outer packaging material 4 is in a decompressed state. The outer packaging material 4 is a laminated film having a gas barrier layer 44, and the gas barrier layer 44 exists only in the core material covering portion 5. Since the vacuum heat insulating material 1 according to the first exemplary embodiment includes the gas barrier layer 44 in the core material covering portion 5, gas such as water vapor and air is reduced from entering the outer packaging material 4 from the outside of the outer packaging material 4. The thermal conductivity of the central part of the vacuum heat insulating material 1 can be kept low over a long period of time. Further, the vacuum heat insulating material 1 according to the first embodiment does not have the gas barrier layer 44 in a range other than the core material covering portion 5. For this reason, the vacuum heat insulating material 1 which concerns on this Embodiment 1 can make small the heat conductivity of the core material non-coating part 6, and can also maintain low effective heat conductivity. Therefore, the vacuum heat insulating material 1 which concerns on this Embodiment 1 can maintain high heat insulation performance over a long period of time.

  In addition, the vacuum heat insulating material 1 which concerns on this invention is not limited to the structure shown in this Embodiment 1, A various deformation | transformation is possible, The structure and modification shown in this Embodiment 1 are as follows. It is possible to implement in combination with each other.

  For example, in the first embodiment, it is exemplified that the core material 2 and the outer packaging material 4 are dried by heat treatment at 100 ° C. for 2 hours in the manufacturing process. The temperature is not limited to this as long as the temperature and time allow removal of moisture from the core material 2 and the outer packaging material 4. Moreover, although the core material 2 and the outer packaging material 4 are dried in a state where the core material 2 is covered with the outer packaging material 4, after the core material 2 and the outer packaging material 4 are separately dried, the core material 2 is encapsulated. You may coat | cover with the material 4. FIG. In the manufacturing process of the vacuum heat insulating material 1 according to the first embodiment, the adsorbent 3 is disposed between the core material 2 and the outer packaging material 4 after the core material 2 and the outer packaging material 4 are dried. The adsorbent 3 may be disposed before the core material 2 and the outer packaging material 4 are dried.

Embodiment 2. FIG.
In this Embodiment 2, an example of the heat insulation box provided with the vacuum heat insulating material 1 which concerns on Embodiment 1 is demonstrated. In the second embodiment, items that are not particularly described are the same as those in the first embodiment, and the same functions and configurations are described using the same reference numerals.

FIG. 3 is a cross-sectional view showing a schematic configuration of the heat insulation box according to Embodiment 2 of the present invention. The heat insulation box 100 is used, for example, in a refrigerator or the like that requires high heat insulation performance.
As shown in FIG. 3, the heat insulating box 100 includes an outer box 120 and an inner box 110 disposed inside the outer box 120. And the vacuum heat insulating material 1 demonstrated in Embodiment 1 is arrange | positioned between the inner box 110 and the outer box 120, and heat insulation is performed between the inner box 110 and the outer box 120.

  The position where the vacuum heat insulating material 1 is disposed is not particularly limited as long as it is a position where heat insulation can be performed between the inner box 110 and the outer box 120. For example, you may arrange | position the vacuum heat insulating material 1 so that the surface facing the outer box 120 in the inner box 110 may be contact | connected. Further, for example, the vacuum heat insulating material 1 may be disposed so as to contact the surface of the outer box 120 facing the inner box 110. Further, for example, a spacer or the like is provided between the inner box 110 or the outer box 120 and the vacuum heat insulating material 1 so that the inner box 110 and the outer box 120 do not contact the vacuum heat insulating material 1. You may arrange | position a vacuum heat insulating material in the space between.

  Here, the vacuum heat insulating material 1 has high heat insulating performance as compared with the urethane foam heat insulating material 130 and the like. For this reason, the heat insulation box 100 provided with the vacuum heat insulating material 1 can obtain heat insulation performance higher than the heat insulation box using only a urethane foam heat insulating material. However, in the space between the inner box 110 and the outer box 120, a portion other than the vacuum heat insulating material 1 may be filled with the urethane foam heat insulating material 130.

  In addition, in said description, illustration and description are abbreviate | omitted about the part equivalent to the heat insulation box used for the general refrigerator.

  As described above, the heat insulating box 100 according to the second embodiment is provided with the vacuum heat insulating material 1 having a low effective thermal conductivity. Thereby, since the heat conductivity between the inner box 110 and the outer box 120 is maintained in a low state, the heat insulating performance of the heat insulating box 100 can be maintained high. For example, in a refrigerator or the like provided with the heat insulation box 100, power consumption can be reduced.

  In addition, in this Embodiment 2, although the structure where the vacuum heat insulating material 1 was used for the heat insulation box 100 of the refrigerator provided with a cold heat source was mentioned as an example, this invention is not limited to this. For example, the vacuum heat insulating material 1 can also be used for the heat insulation box of a heat retention box provided with a heat source. For example, the vacuum heat insulating material 1 can also be used for a heat insulation box that does not include a cold heat source and a heat heat source, such as a cooler box. Moreover, you may use the vacuum heat insulating material 1 as a heat insulation member of not only a heat insulation box but cold / heat equipment, such as an air conditioner, a vehicle air conditioner, and a water heater. Moreover, you may use the vacuum heat insulating material 1 for a heat insulation container etc. Moreover, the shape of the vacuum heat insulating material 1 is not limited to said flat plate shape. For example, the vacuum heat insulating material 1 may be formed in a curved shape that protrudes upward or downward in FIG. For example, you may use the vacuum heat insulating material 1 for the heat insulation bag provided with the deformable outer bag and the inner bag.

  DESCRIPTION OF SYMBOLS 1 Vacuum heat insulating material, 2 core material, 3 adsorbent, 4 outer packaging material, 41 surface protection layer, 42 base material layer, 43 heat sealing | fusion layer, 43a sealing part, 44 gas barrier layer, 5 core material coating | coated part, 6 core Material non-covering part, 100 heat insulation box, 110 inner box, 120 outer box, 130 urethane foam heat insulating material.

The vacuum heat insulating material according to the present invention is a vacuum heat insulating material that includes a core material and an outer packaging material that covers the core material, and the inside of the outer packaging material is in a reduced pressure state. The laminated film having a gas barrier layer, the outer packaging material has two surfaces facing the thickness direction of the vacuum heat insulating material in a range facing the core material, and constitutes the two surfaces When the outer packaging material portion is defined as the core material covering portion, the gas barrier layer is present only in the core material covering portion, and the range other than the core material covering portion in the outer packaging material is defined as the core material non-covering portion. In this case, the core material non-covered portion is bent along the shape of the core material .

Claims (10)

A vacuum insulating material comprising a core material and an outer packaging material covering the core material, wherein the interior of the outer packaging material is in a reduced pressure state,
The outer packaging material is a laminated film having a gas barrier layer,
In a range where the outer packaging material is opposed to the core material, the outer packaging material has two surfaces facing the thickness direction of the vacuum heat insulating material,
When the outer packaging material portion constituting the two surfaces is defined as a core material covering portion,
The said gas barrier layer is a vacuum heat insulating material which exists only in the said core material coating | coated part. The outer packaging material is
The gas barrier layer, the base material layer, a surface protective layer provided on the outer surface side of the base material layer, and a heat fusion layer provided on the inner surface side of the base material layer. Vacuum insulation material.   The gas barrier layer is between the surface protective layer and the base material layer, between the base material layer and the thermal fusion layer, and between the thermal fusion layer and the core material. The vacuum heat insulating material according to claim 2 provided between at least one. The gas barrier layer is
The vacuum heat insulating material according to any one of claims 1 to 3, which is at least one of a metal foil layer, a metal vapor deposition layer, and a metal oxide vapor deposition layer.   The vacuum heat insulating material according to claim 4, wherein the metal used for the gas barrier layer is aluminum. When a range other than the core material covering part in the outer packaging material is defined as a core material non-covering part,
The vacuum heat insulating material according to any one of claims 1 to 5, wherein the core material non-covering portion is bent along the shape of the core material.   The vacuum heat insulating material according to any one of claims 1 to 6, wherein the core material is a fiber assembly.   The vacuum heat insulating material according to claim 7, wherein the core material is glass wool. It has an adsorbent that adsorbs moisture,
The vacuum heat insulating material according to any one of claims 1 to 8, wherein the core material and the adsorbent are covered with the outer packaging material. An outer box,
An inner box disposed inside the outer box;
The vacuum heat insulating material according to any one of claims 1 to 9, disposed between the outer box and the inner box,
Insulated box with.

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