JP2017072185A - Vacuum heat insulating material and device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum heat insulating material having reduced heat conductivity, and a device including the vacuum heat insulating material.SOLUTION: A vacuum heat insulating material 1 comprises: a core material 10 in which second core materials 101 comprising holes are stacked in a thickness direction; and an outer package material 11 formed so as to include a resin layer, and housing the core material. Pressure inside the outer package material is less than atmospheric pressure. The vacuum heat insulating material comprises a depressurized space 12 surrounded by the core material and the outer package material.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vacuum heat insulating material and a device using the same.

  2. Description of the Related Art A vacuum heat insulating material manufactured through a process of reducing the pressure inside an outer packaging material after inserting the core material into the outer packaging material is widely known. Since such a vacuum heat insulating material has a reduced amount of air in the outer packaging material due to the decompression process, the heat transfer mechanism has a relatively small influence of heat transfer by convection, between the fibers of the core material, the outer packaging material, etc. It is relatively governed by solid heat conduction that occurs in Under such circumstances, Patent Document 1 is known as a technique for suppressing heat conduction between core fibers, for example.

JP 2009-133336 A

  Patent Document 1 discloses a configuration in which a high-density portion and a low-density portion are provided in a non-woven fabric that constitutes a core material. For example, a configuration in which a portion of the fibers of the non-woven fabric 4 is pressed as a low-density portion and a through hole 31 is provided. However, the diameter of the through hole is as small as about 1 mm (0058, 0062, 0063, 0067, FIG. 15). In order to suppress the solid heat conduction by the fibers of the core material, it is necessary that the space formed by the formed holes and recesses remain in the completed vacuum heat insulating material. However, in a through hole having a small size as in Patent Document 1, it is considered that when the vacuum heat insulating material is subjected to a pressure reducing step, the through hole is reduced due to compression of surrounding fibers and disappears. Moreover, nothing is disclosed about the positional relationship between the sealing film 3 (outer packaging material) and the core material.

  The present invention made in view of the above circumstances has a core material in which a second core material having a hole is laminated in the thickness direction, and an outer packaging material that is formed including a resin layer and stores the core material, The inside of the outer packaging material is a pressure lower than atmospheric pressure, and is a vacuum heat insulating material having a decompression space surrounded by the core material and the outer packaging material.

  ADVANTAGE OF THE INVENTION According to this invention, the vacuum heat insulating material which reduced heat conductivity and an apparatus provided with the same can be provided.

(A) is a front view of the first core material of Example 1, (b) is a front view of the second core material of Example 1, and (c) is formed by laminating the first core material and the second core material. Side surface sectional view of the core material of Example 1 Side surface sectional view of the vacuum heat insulating material of Example 1 (A) is the schematic diagram of the shape of the core material accommodated in the vacuum heat insulating material of Example 1 after pressure reduction, (b) is the core material accommodated in the vacuum heat insulating material as a comparative example which does not have a space. Schematic diagram of shape Side surface sectional drawing of the vacuum heat insulating material of Example 2. Side surface sectional drawing of the vacuum heat insulating material of Example 3. Front view of the vacuum heat insulating material of Example 4 Side surface sectional drawing along the BB line of the vacuum heat insulating material bent along the AA line of FIG. Front view of the core material of Example 5 CC sectional perspective view of FIG. Front view of refrigerator Cross section of refrigerator door

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Similar components are denoted by the same reference numerals, and the same description is not repeated.

1A is a front view of the first core member 100 of the present embodiment, FIG. 1B is a front view of the second core member 101 of the present embodiment, and FIG. FIG. 2 is a side sectional view of the vacuum heat insulating material 1 of the present embodiment, and FIG. 2 is a side sectional view of the core material 10 formed by laminating the second core material 101.
The vacuum heat insulating material 1 includes a sheet-like core material 10 in which a plurality of sheets are stacked in the thickness direction, and an outer packaging material 11 that encloses the core material 10. The vacuum heat insulating material 1 can be manufactured through the process of decompressing the outer packaging material 11 after inserting the core material 10 into the outer packaging material 11.

[Core 10]
The core material 10 includes a planar first core material 100 and a second core material 101 provided with one or more holes 1010 penetrating in the thickness direction. The core material 10 is laminated with a first core material 100 as a layer extending from the outermost layer on one side in the thickness direction (the lower side in FIG. 1C) toward the other side, and from there in the thickness direction. The second core material 101 is laminated as a layer up to the outermost layer on the other side (the upper side in FIG. 1C). The holes 1010 of the second core material 101 overlap each other in the thickness direction. A non-penetrating space 12 is formed in the core member 10 by the overlapping holes 1010 in the thickness direction. Details of the space 12 will be described later.

  The shapes of the outer ends 1001, 1011 of the first core member 100 and the second core member 101 of this embodiment are rectangular, but may be substantially circular, substantially elliptical, substantially polygonal, or the like.

  The core material 10 can be, for example, a wet glass sheet obtained by making slurry glass wool or glass fiber. This method for producing a glass sheet can include, for example, the following steps. First, glass fiber having a fiber diameter of 3 to 5 μm and a fiber length of 20 to 50 mm is slurried using sulfuric acid as a dispersant. Thereafter, the slurry is poured into a flat mesh that does not drop the glass fiber, and dried. Through these steps, the first core material 100 can be manufactured.

  On the other hand, if, for example, a cylindrical object is erected and fixed to a part of the above-described planar mesh so that the slurry does not stay in this region, a hole 1010 having a shape corresponding to the shape of the object is formed. The 2nd core material 101 which has can be manufactured. If the 2nd core material 101 is manufactured in this way, the usage-amount of glass fiber can be reduced comparatively.

  As another manufacturing method of the second core material 101, instead of standing and fixing an object on a flat mesh, a step of opening a hole 1010 using a jig to the manufactured first core material 100 is performed. You may let it pass. In this case, although the amount of the glass fiber used is relatively increased, it is possible to suppress the slurried fibers from staying around the object as compared with the above manufacturing method. For this reason, since it can suppress that the core material 10 becomes entangled in the surface direction in the area | region of the hole 1010, the 2nd core material 101 which reduced thermal conductivity can be provided. Note that since the so-called dry core material has a relatively large thickness, it is difficult to perform the step of opening the hole 1010. For this reason, when manufacturing the 2nd core material 101 using a jig for the 1st core material 100, it is preferable that the 1st core material 100 is manufactured through the process of spreading said glass fiber.

[Outer packaging material 11]
The outer packaging material 11 can be a bag-like object having one opening. The outer packaging material 11 can insert the core material 10 inside through this opening. As a material of the outer packaging material 11, for example, a three-sided bag in which an aluminum-deposited deposited layer or a laminate film including a plurality of resin film layers is formed can be used. By using the aluminum layer, heat transfer due to radiation can be suppressed. Moreover, the intensity | strength with respect to pushing of the outer packaging material 11 mentioned later can be improved by using the elastic resin film layer.
When the inside of the outer packaging material 11 is decompressed after the laminated core material 10 is inserted into the outer packaging material 11, the outer packaging material is located in a region overlapping the space 12 and a region outside the outer ends 1001 and 1011 in a top view of the vacuum heat insulating material 1. 11 is pushed in by atmospheric pressure. For this reason, in the area | region which overlaps with the space 12, the outer packaging material 11 becomes convex toward the space 12, and in the area | region outside the outer ends 1001 and 1011, the outer packaging material 11 is each 1st core material 100 and the 2nd core material 101. It comes in close contact with the outer ends 1001, 1011.
By this decompression step, the space 12 becomes a decompressed space surrounded by the core material 10 and the outer packaging material 11. In addition, when inserting the core material 10 into the outer packaging material 11, the laminated core material 10 is once put in an inner bag (not shown) and then evacuated to compress the core material 10, and then the opening of the inner bag is opened. You may perform the process of sealing and inserting this in the outer packaging material 11 on it. If it carries out like this, since the core material 10 can be compressed, it can insert in the outer packaging material 11, Therefore An insertion process can be performed easily. If the sealing of the inner bag is released after the insertion step, the same effect as described above can be obtained when the outer packaging material 11 is decompressed.

[Hole 1010 and Space 12]
A large pressing force due to atmospheric pressure is applied to the outer packaging material 11 in the outer peripheral region of the hole 1010 and the regions of the outer ends 1001 and 1011. Especially, in the area | region which overlaps with the hole 1010, since the core material 10 does not support the pressed outer packaging material 11, force concentrates on the outer peripheral area | region of the hole 1010. For this reason, it is preferable to give the structure which suppresses the fracture | rupture of the outer packaging material 11. FIG. This will be described from the viewpoint of the dimensions of the hole 1010 and the space 12.

First, the hole 1010 can be formed into a substantially circular shape, a substantially elliptical shape, a substantially polygonal shape, or the like in a top view of the core member 10, but the case where it is formed into a substantially circular shape will be considered. When the diameter of the hole 1010 is increased by n times, the area of the hole 1010, that is, the area of the outer packaging material 11 covering the decompression space is increased by n ² times. Therefore, the pushing force of the outer cover material 11 according to the atmospheric pressure is ^doubled n. On the other hand, since the outer peripheral length of the hole 1010 is n times, the region for supporting the pushing force is n times. That is, the force per unit length that the outer packaging material 11 receives on the outer periphery of the hole 1010 is considered to be n times. Therefore, the outer packaging material 11 is easily broken as the diameter of the hole 1010 is increased. Since the vacuum state is released when the outer packaging material 11 breaks, a configuration that suppresses the break is desired.

  Further, when the area and the number of the holes 1010 are increased, the area of the core material 10 that supports the force received by the outer packaging material 11 is decreased, so that the compressive force per unit area applied to the core material 10 is increased. As a result of the increase in compressive force, if the thickness of the vacuum heat insulating material 1 after decompression is reduced, the two surfaces of the outer packaging material 11 that protrude toward the decompression space may come into contact with each other, and a heat conduction path may be generated. It is preferable that the compression force is within an appropriate range in terms of configuration. The total area of the holes 1010 is preferably 50% or less of the sum of the area of the second core material 101 and the total area of the holes 1010.

Moreover, in the top view of the vacuum heat insulating material 1, it is preferable that the spaces 12 are separated by a distance of at least twice, preferably at least 2.5 times the size of the space 12. For example, in the vacuum heat insulating material 1 including the space 12 having a diameter of 20 mm according to the present embodiment, the vertical separation distance a ₁ and the horizontal separation distance a ₂ illustrated in FIG. 1B are each 40 mm or more, preferably 50 mm or more. It is good to make it. For example, when the shape of the hole 1010 is not a substantially circular shape, the same is considered for each dimension in each direction. For example, if a ₁ direction long axis direction, a ₂ direction is substantially elliptical a minor axis direction, the major axis dimension a _1, the minor axis dimension of a _2, respectively 2 times or more, preferably 2 It is better to separate them by a distance of 5 times or more.

  As described above, from the viewpoint of suppressing heat conduction, it is preferable to increase the area of the hole 1010 to suppress the amount of the core material 10 used. The upper limit of the diameter of the hole 1010 depends on the strength of the outer packaging material 11 and the core material 10 and the thickness of the vacuum heat insulating material 1 after decompression. For example, when the outer packaging material 11 is a resin film, the hole forming the space 12 is formed. If each 1010 has a diameter of, for example, φ20 mm or less, it is possible to prevent the outer packaging material 11 from being broken due to the pressing even when the outer packaging material 11 is pushed by atmospheric pressure. At this time, if the core material 10 is made of glass fiber, the thickness of the vacuum heat insulating material 1 after depressurization is, for example, 1/4 or more of the diameter of the hole 1010, preferably more than half, that is, 5 mm or more in the above example. If designed to be preferably 10 mm or more, it is possible to easily separate the two surfaces of the outer packaging material 11 in the decompression space. If the shape of the hole 1010 is other than a substantially circular shape, it can be considered in the same manner by replacing the direction with the longest dimension. For example, in the case of a substantially elliptical shape, the major axis length may be substituted for the diameter of the hole 1010.

  On the other hand, in order to obtain a dimension in which a decompression space is generated after decompression, the dimension in any direction of the hole 1010, for example, the lower limit of the diameter can be set to, for example, φ2 mm or more, preferably 4 mm or more. According to the above knowledge, in view of the pushing force by the atmospheric pressure on the outer packaging material 11, the shape of the hole 1010 is a shape that can easily secure the outer peripheral length of the hole 1010 with respect to the area of the hole 1010, for example, a substantially circular shape or A substantially elliptical shape is preferred. When the shape of the hole 1010 is other than a substantially circular shape, for example, a value of (peripheral length of the hole 1010) / area of the hole 1010) can be used as an index instead of the diameter of the hole 1010.

  As described above, the space 12 is non-penetrating on at least one side in the thickness direction of the core member 10. For this reason, even if air remains in the decompression space in a predetermined amount or more, heat can be suppressed from being transferred from one side in the thickness direction to the other side by convection. Thus, making the space 12 non-penetrating is preferable, for example, when it is difficult to perform evacuation with a reduced pressure step with high accuracy.

  FIG. 3A is a schematic diagram of the shape of the core material 10 housed in the vacuum heat insulating material 1 of the present embodiment after decompression, and FIG. 3B is a vacuum heat insulating material 1A as a comparative example having no space 12. It is a schematic diagram of the shape of the core material 10 accommodated in. As illustrated in FIG. 1B, a plurality of spaces 12 can be arranged in the vacuum heat insulating material 1 of the present embodiment, for example, can be arranged in a lattice shape. In the top view of the vacuum heat insulating material 1, the outer packaging material 11 receives a force that is pushed inward in the thickness direction at the outer end 1011 in addition to each of the places where the spaces 12 are arranged. That is, the outer packaging material 11 gives a force for pushing the core material 10 at the outer periphery of the space 12 and the outer end 1011 respectively. Thus, since the pushing force can be given also in the core material 10 center side area | region by the space 12, the vacuum heat insulating material 1 of a present Example can improve smoothness. For this reason, aesthetics can be improved through this. On the other hand, in the vacuum heat insulating material 1A of the comparative example, the outer packaging material 11 pushes the core material 10 in the thickness direction only on the end surface of the core material 10, that is, in the vicinity of the outer end 1001. That is, the center side region of the core material 10 has a relatively convex shape, and the center side tends to swell greatly compared to the present embodiment.

  The distribution of the space 12 can be a distribution similar to the shape of the vacuum heat insulating material 1. For example, when the core member 10 has a rectangular shape in a top view as in the present embodiment, the space 12 is evenly distributed in the vacuum heat insulating material 1 when the distribution of the space 12 is repeated in a rectangular shape, that is, substantially in a lattice shape. Is preferable because it is easy to distribute. Similarly, when the core material 10 is substantially circular, it is preferable to arrange the space 12 substantially on a concentric circumference.

In addition, it is preferable to maintain the planar shape of the core material 10 without providing the space 12 near the outer end 1011 of the core material 10. For example, in this embodiment, the longitudinal distance c ₁ and the lateral distance c ₂ from the outer end 1011 are each 0.5 times or more, preferably 1.0 times or more of the diameter φ. If the space 12 is provided in the vicinity of the outer end 1011, the outer packaging material 11 pushes the outer end 1011 outward to damage the core material 10, or the amount of the core material 10 in the vicinity of the outer end 1011 decreases to cause damage in other manufacturing processes. This is because there is a risk of doing so. In addition, when the space 12 is provided so as to cut out the outer end 1011, the length of the outer end 1011 increases, so that the area of the portion where the outer packaging material 11 extends in the thickness direction increases. This is not preferable because heat transfer by the outer packaging material 11 increases. From the above, for example, it is preferable to keep the planar shape without providing the space 12 at 10 mm or more from the outer end 1011. In addition, when the hole 1010 has a shape other than a substantially circular shape, it can be considered in the same manner as a ₁ and a ₂ described above.

[Adsorbent]
Between the layers of the first core material 100 or the second core material 101, an adsorbent (not shown) such as a zeolite-based material can be disposed. If it carries out like this, it will contribute to reduction of the initial thermal conductivity of the vacuum heat insulating material 1 by adsorb | sucking the residual gas after pressure reduction of the outer packaging material 11, or vacuum heat insulation by adsorb | sucking the gas which penetrate | invaded the outer packaging material 11 inside. This contributes to suppression of deterioration of the heat insulation performance of the material 1. If an adsorbent is disposed between the second core members 101, it may be collected in the space 12 over time. Therefore, it is preferable to dispose the adsorbent between the first core members 100.

[Others]
In the vacuum heat insulating material 1 described above, the outermost layer on the other side in the thickness direction (the upper side in FIG. 1C) is the second core material 101, but the outermost layer or the substantially outermost layer is the first core material 100. Good. Thereby, if it designs so that the outer packaging material 11 may contact the 1st core material 100 after a pressure reduction process, the fracture | rupture of the outer packaging material 11 can be suppressed effectively. However, in this case, if the first core material 100 is thin, the pressing force of the outer packaging material 11 may not be supported by the first core material 100 and may break, and if it is thick, the space 12 may not be effectively decompressed. There is. When the fractured first core member 100 extends in the thickness direction, heat transfer in the thickness direction is likely to occur. Therefore, it is preferable that the decompressed space can be formed while the fracture is suppressed. In addition, since the design can be omitted if the first core member 100 is not provided in the substantially outermost layer as described above, it is easy to manufacture the vacuum heat insulating material 1 after the pressure reducing step.

The configuration of the second embodiment can be the same as that of the first embodiment except for the following points.
FIG. 4 is a side sectional view of the vacuum heat insulating material 1 of this embodiment. The core material 10 is formed by laminating the second core material 101 from one outermost layer in the thickness direction to the outermost layer on the other side, and the space 12 is formed as a through hole penetrating from one side to the other side. Yes. By carrying out like this, since the quantity of the core material 10 can further be suppressed, the heat conduction through the core material 10 can further be suppressed. In this case, however, if a predetermined amount or more of air remains in the decompression space, the influence of heat transfer due to convection increases, and therefore, it is preferable to carry out vacuuming, for example, with high accuracy.

  Since the space 12 is a through hole, the outer packaging material 11 is deformed into a convex shape from both sides in the thickness direction toward the decompression space. In order to suppress heat transfer by the outer packaging material 11, it is preferable that these two outer packaging materials 11 be separated from each other.

The configuration of the third embodiment can be the same as that of the second embodiment except for the following points.
FIG. 5 is a side sectional view of the vacuum heat insulating material 1 of the present embodiment. With respect to the thickness direction of the laminated core material 10, there is a region where the second core material 101 is laminated at a location including the outermost layers on one side and the other side, and one or more locations on the central side. There is a region where one or more first core members 100 are laminated.

  The vacuum heat insulating material 1 is provided with spaces 12 on both sides in the thickness direction and overlapping in the top view. Furthermore, the 1st core material 100 is distribute | arranged between those two spaces 12, and it can suppress the heat transfer by the convection of the air which remained in the pressure reduction space, suppressing the heat conduction by the core material 10. FIG. Since the core material disposed between the spaces 12 only needs to suppress air convection, the core material does not necessarily have to be the first core material 100, and the second core material 101 provided with holes other than the portion overlapping the space 12. But you can.

  It is preferable that the adsorbent is arranged between two or more first core members 100 laminated on the center side and arranged between the first core members 100. At this time, it is more preferable to dispose the adsorbent including the region overlapping the space 12 in the top view of the vacuum heat insulating material 1 because the air remaining in the decompressed space can be adsorbed effectively.

Moreover, it is preferable that the basis weight of the first core member 100 is larger than the basis weight of the second core member 101. The first core member 100 is preferably provided in the middle of the space 12 to suppress the convection of air or to retain the adsorbent. Therefore, it is preferable to ensure the blockage and strength of the convection, This is because it is preferable to suppress the amount of the core material 10 because the two-core material 101 is expected to have a function of suppressing heat conduction. For example, the basis weight of the first core material 100 can be 150 g / m ² or more, or 180 g / m ² or more, and the basis weight of the second core material 101 can be less than 150 g / m ² or 120 g / m ² or less.

The configuration of the fourth embodiment can be the same as that of any of the first to third embodiments except for the following points.
FIG. 6 is a front view of the vacuum heat insulating material 1 of the present embodiment, and FIG. 7 is a side cross-sectional view along the line BB of the vacuum heat insulating material 1 of the present embodiment bent along the line AA of FIG. (However, the space 12 is not shown). The vacuum heat insulating material 1 of the present embodiment is bent. A space is provided in the core member 10 corresponding to the bent portion, and this is referred to as a bending space 13. The bending space 13 can be formed by providing a hole in the same manner as the space 12. The shape of the hole forming the folding space 13 can be the same as that of the hole 1010, but is preferably a substantially elliptical shape having a major axis in the bending direction. For example, when the core material 10 is bent along the line AA shown in FIG. 6, a substantially elliptical hole having a major axis in the AA line direction can be provided in the core material 10. Thus, it is preferable to arrange a plurality of bending spaces 13 in the major axis direction because the bending can be effectively performed. In addition, since the space 13 for bending can also form a decompression space, the effect similar to the space 12 can be show | played.

In this embodiment, the bending space 13 is penetrated in the thickness direction of the core member 10, but it may be non-penetrating. Providing the folding space 13 that opens to the outside (mountain side) in the folding direction can suppress the generation of corners in the core material 10 due to the bending, and therefore the outer packaging material 11 is stretched along the corners and broken. Can be suppressed. On the other hand, when the folding space 13 that opens inside (the valley side) in the folding direction is provided, it is possible to prevent the core material 10 from being bulged due to the folding, so that it is difficult to arrange other members in the vicinity of the bent portion. Can be suppressed.
In addition, when the folding space 13 opened inside (the valley side) in the folding direction is provided, the outer packaging material 11 may be pushed into the inner side in the thickness direction of the vacuum heat insulating material 1 along with the folding. For this reason, when doing in this way, the space 13 for bending is made into a through-hole, or the lamination | stacking position of the 1st core material 100 or the 2nd core material 101 which divides | segments the space 13 for bending is made a mountain side near the thickness direction center. Thus, even if the outer packaging material 11 is pushed inward, it can be separated from other members in the decompression space.

The configuration of the fifth embodiment can be the same as that of any of the first to fourth embodiments except for the following points.
FIG. 8 is a front view of the core material 10 of the present embodiment, and FIG. 9 is a cross-sectional perspective view taken along the line CC of FIG. The folding space 13 of the present embodiment has a substantially elliptical shape, and a plurality of the folding spaces 13 are arranged on the circumference, and the major axis direction of each of the folding spaces 13 faces the circumferential direction. By carrying out like this, the substantially circular area | region of the core material 10 can be bent so that it may protrude to one side of the thickness direction. As illustrated in FIG. 8, the space 12 may be arranged inside the circle in which the bending spaces 13 are arranged, or may not be arranged.

A present Example is related with the refrigerator 2 which is an example of an apparatus provided with the vacuum heat insulating material 1 of each Example. 10 is a front view of the refrigerator 2, and FIG. 11 is a sectional view of the door 6 of the refrigerator.
The refrigerator 2 includes refrigerator compartment doors 6a and 6b, freezer compartment doors 7a, 7b and 8, and a vegetable compartment door 9. Although the vacuum heat insulating material 1 can be suitably arranged in any of the doors 6-9, the case where the vacuum heat insulating material 1 of Example 1 is arranged in the refrigerator compartment door 6 is demonstrated in a present Example.

The refrigerator compartment door 6 includes a steel plate 60 provided on the front side of the refrigerator 2, a side plate 61 defining a space on the back side of the steel plate 60, the vacuum heat insulating material 1 attached between the steel plate 60 and the side plate 61, and A foam insulation 62 is provided. The vacuum heat insulating material 1 is attached so that the surface on which the space 12 is provided faces the foam heat insulating material 62, and the surface on which the outermost layer is the first core material 100 faces the steel plate 60.
As the foam heat insulating material 62 is filled, a pressing force is applied to the surface of the vacuum heat insulating material 1 on the foam heat insulating material 62 side. Then, the portion of the outer packaging material 11 that is overlapped with the space 12 moves while being pushed inward in the thickness direction, and the space formed by this movement is filled with the foam heat insulating material 62. The formation of air layers and voids can be suppressed. In addition, since the outermost layer is the first core member 100 and the surface with less recesses faces the steel plate 60, it is possible to suppress the formation of an air layer between the steel plate 60 and the vacuum heat insulating material 1. If the mounting direction of the vacuum heat insulating material 1 is reversed, a recess is formed between the portion of the outer packaging material 11 that overlaps the space 12 and the steel plate 60, and as a result, an air layer may be generated.

  The vacuum heat insulating material 1 may be applied to other objects belonging to the scope of the present invention, such as those of other embodiments, or provided in the freezer compartment doors 7 and 8, the vegetable compartment door 9 or other places. May be. It will be apparent to those skilled in the art that a similar mounting configuration can be applied to any device.

DESCRIPTION OF SYMBOLS 1 ... Vacuum heat insulating material 10 ... Core material 100 ... 1st core material 1001 ... Outer end 101 ... Second core material 1010 ... Hole 1011 ... Outer end 11 ... Outer packaging material 12 ... space 13 ... bending space 2 ... refrigerator 6 ... refrigerator compartment door 7 ... freezer compartment door 8 ... freezer compartment door 9 ... vegetable compartment door 1A ...・ Comparative vacuum insulation

Claims (8)

A core material in which a second core material having holes is laminated in the thickness direction;
An outer packaging material that includes a resin layer and contains the core material;
The outer packaging material has a pressure below atmospheric pressure,
A vacuum heat insulating material having a decompression space surrounded by the core material and the outer packaging material.   In the top view of the outer packaging material, the portion of the outer packaging material where the outer packaging material and the space overlap is separated from the other portion of the outer packaging material and the core material. The vacuum heat insulating material according to claim 1.   3. The vacuum heat insulating material according to claim 1, wherein a thickness of the core material under pressure in the outer packaging material is ¼ or more of a dimension in a longest direction among dimensions of the hole.   The total area of the holes provided in the second core material is 50 with respect to the sum of the area of the second core material and the total area of the holes in a state where the second core material is under atmospheric pressure. The vacuum heat insulating material according to any one of claims 1 to 3, wherein the vacuum heat insulating material has a value of% or less. The space is provided on each of one side and the other side in the thickness direction,
Between the space on the one side and the other side, a sheet-shaped first core material, or a second core material having a hole in a portion other than a portion overlapping the space in a top view of the vacuum heat insulating material The vacuum heat insulating material as described in any one of Claims 1 thru | or 4 characterized by these.   The basis weight of the first core member or the second core member provided between the space on the one side and the other side is substantially larger than the basis weight of the first core member and the second core member in the other part of the vacuum heat insulating material. The vacuum heat insulating material according to claim 5, wherein the vacuum heat insulating material is large.   The vacuum heat insulating material according to any one of claims 1 to 6, wherein a dimension of the hole in an arbitrary direction is 2 mm or more. The vacuum heat insulating material according to any one of claims 1 to 6,
A mounting portion for mounting the vacuum heat insulating material,
The vacuum heat insulating material has a sheet-shaped first core material in a substantially outermost layer, and the substantially outermost layer side is attached to the attachment portion.

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