WO2020255884A1 - Vacuum insulation material and insulated box using vacuum insulation material - Google Patents

Abstract

The present invention addresses the problem of making it easy for a vacuum insulation material in which a flat core material is sealed in a depressurized state by a sheath material to be mounted on a curved surface. A vacuum insulation material that comprises a flat core material (3) and a sheath material (2) that covers the core material (3). First grooves (21) are formed in a width direction W center part (11) of the core material (3), and second grooves (22) are formed in two end parts (12, 13) of the core material (3) that are on either side of the center part (11) in the width direction W. When sealed in a depressurized state, the core material (3) deforms such that the curvature of the two end parts (12, 13) is greater than the curvature of the center part (11). As a result, the end parts (12, 13) can be easily mounted along a curved surface, and separation of the vacuum insulation material (1) from the curved surface can be reduced.

Description

Insulation box body using vacuum heat insulating material and vacuum heat insulating material

The present invention relates to a vacuum heat insulating material and a heat insulating box body using the vacuum heat insulating material.

Conventionally, a vacuum heat insulating material in which a porous core material is inserted into an outer bag having a gas barrier property and the inside is depressurized and sealed is known.
The vacuum heat insulating material is used as a heat insulating material for a heat insulating container, a water heater, and the like, and when the construction surface of the vacuum heat insulating material is curved, the vacuum heat insulating material is deformed and attached according to the construction surface.
When the flat plate vacuum heat insulating material is curved, it is known that a recess is formed on one side of the core material and the region where the recess is formed is curved so as to be recessed (see, for example, Patent Document 1). ).
Further, in order to bring the vacuum heat insulating material into close contact with a cylindrical object such as a tank, it is known that a flat plate vacuum heat insulating material is provided with grooves having a certain depth and spacing (see, for example, Patent Document 2).

JP-A-2015-224706 JP-A-2007-155065

However, the end of the vacuum heat insulating material is harder to bend than the central part, and immediately after the core material is vacuum-sealed, the central part of the vacuum heat insulating material is curved more strongly than the end, and the curvature of the central part becomes large. Further, a large force is required to deform the end portion of the vacuum heat insulating material according to the curved surface which is the construction surface. Therefore, a lot of labor is required to prevent a gap from being formed between the end portion and the construction surface.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vacuum heat insulating material that can be easily attached to a curved surface.

In order to achieve the above object, the present invention includes a flat core material and an outer cover material that covers the core material, and a first groove is formed in the central portion in the width direction of the core material, and the central portion is formed. In a state where the second groove is formed at the two ends of the core material that sandwiches the core material in the width direction and is sealed under reduced pressure, the deformation of the core material is such that the curvature of the two ends is the curvature of the central portion. It is characterized in that it is formed larger than.

According to this, when the vacuum heat insulating material is attached to the curved surface, the end portion of the vacuum heat insulating material has a curved shape with a large curvature, so that the end portion of the vacuum heat insulating material can be easily aligned with the curved surface. As a result, the amount of the end portion floating from the curved surface can be easily reduced, and the vacuum heat insulating material can be easily attached.
In addition, this specification shall include all the contents of the Japanese patent application / Japanese Patent Application No. 2019-112952 filed on June 18, 2019.

According to the present invention, when the vacuum heat insulating material is attached to a curved surface, the amount of the end floating from the curved surface can be reduced, so that the vacuum heat insulating material can be easily attached.

FIG. 1 is a cross-sectional view of the vacuum heat insulating material developed in a flat plate shape. FIG. 2 is a schematic perspective view showing a curved vacuum heat insulating material. FIG. 3 is an explanatory view showing a vacuum heat insulating material attached to a cylindrical object.

The first invention includes a flat core material and an outer cover material that covers the core material, a first groove is formed in a central portion in the width direction of the core material, and the central portion is formed in the width direction. In a state where the second groove is formed at the two ends of the core material to be sandwiched and sealed under reduced pressure, the deformation of the core material is such that the curvature of the two ends is larger than the curvature of the central portion. It is a thing.
According to this, when the vacuum heat insulating material is attached to the curved surface, the amount of the end portion floating from the curved surface can be reduced, so that the vacuum heat insulating material can be easily attached.

In the second invention, the depth of the second groove is formed deeper than the depth of the first groove.
According to this, the core material at the end of the vacuum heat insulating material can be easily deformed, and the vacuum heat insulating material that can be easily attached to the curved surface can be provided.

In the third invention, the pitch of the second groove is narrower than the pitch of the first groove.
According to this, at the end portion of the vacuum heat insulating material, the stress due to the jacket material can be generated more strongly, and the end portion can be easily bent. Then, it is possible to provide a vacuum heat insulating material that can be easily attached to a curved surface.

In the fourth invention, the width of the second groove is formed wider than the width of the first groove.
According to this, at the end portion of the vacuum heat insulating material, the stress due to the jacket material can be generated more strongly, and the end portion can be easily bent. Then, it is possible to provide a vacuum heat insulating material that can be easily attached to a curved surface.

In the fifth invention, the number of lines formed per unit length in the width direction is larger than that of the first groove.
According to this, the core material at the end of the vacuum heat insulating material can be easily deformed, and the vacuum heat insulating material that can be easily attached to the curved surface can be provided.

The sixth invention is to dispose a water adsorbent in the central portion of the core material.
According to this, it is possible to provide a vacuum heat insulating material provided with a moisture adsorbent while suppressing the influence on the curvature of the end portion.

A seventh invention is a heat insulating box body containing a container to which the vacuum heat insulating material is attached.
According to this, the vacuum heat insulating material can be easily attached to the curved surface, and the labor required for manufacturing the heat insulating box can be reduced.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a vacuum heat insulating material in which the core material is developed into a flat plate to show the arrangement configuration of the grooves according to the present embodiment. FIG. 2 is a schematic perspective view showing the vacuum heat insulating material according to the present embodiment. FIG. 3 is an explanatory view showing a vacuum heat insulating material attached to a cylindrical object.
In the figure, UP indicates the upper side, W indicates the width direction of the vacuum heat insulating material, and D indicates the length direction of the vacuum heat insulating material. In addition, in FIG. 1, the upper UP corresponds to the thickness direction of the vacuum heat insulating material.

As shown in FIG. 1, the vacuum heat insulating material 1 includes a core material 3 and an outer cover material 2 that covers the outside of the core material 3. Further, the moisture adsorbent 4 is arranged in the core material 3.
The core material 3 is a flat plate having a constant thickness, is inserted into the bag-shaped outer cover material 2, and is sealed under reduced pressure. As a result, the flat plate-shaped vacuum heat insulating material 1 is obtained.

A plurality of first grooves 21 and second grooves 22 are formed on one main surface 10 of the vacuum heat insulating material 1.
The central portion 11 is the central portion of the vacuum heat insulating material 1 in the width direction W, and is located between the end portions 12 and the end portions 13 in the width direction W.
In the vacuum heat insulating material 1, the end portion 12 and the end portion 13 are portions in the width direction W of the vacuum heat insulating material 1 from the end 12a and the end 13a to the inside of the width direction W up to a predetermined distance L. Then, a portion other than the end portion 12 and the end portion 13 becomes the central portion 11. The distance L is appropriately set depending on the size of the vacuum heat insulating material 1, the shape of the curved surface to which the vacuum heat insulating material 1 is attached, and workability. For example, when the dimensions of the vacuum heat insulating material 1 are 410 mm × width 1020 mm × thickness 15 mm, it is preferable that the predetermined distance L is 200 mm to 100 mm.

A first groove 21 is formed in the core material 3 of the central portion 11, and a second groove 22 is formed in the end portion 12 and the end portion 13. The first groove 21 and the second groove 22 are formed linearly along the length direction D of the vacuum heat insulating material 1.
The first groove 21 and the second groove 22 have a V-shaped cross section along the width direction W. The depth D1 of the first groove 21 from the main surface 10 is formed to be shallower than the depth D2 of the second groove 22 from the main surface 10. As a result, the thickness of the portion where the second groove 22 is formed becomes thinner than the thickness of the portion where the first groove 21 is formed, and the portion where the second groove 22 is formed is easily deformed.
For example, the depth D1 of the first groove 21 may be 80% or less of the depth D2 of the second groove 22.

The width W1 on the main surface 10 of the first groove 21 may be formed narrower than the width W2 on the main surface 10 of the second groove 22. The wider the groove formed, the more stress is likely to be generated by the outer cover material 2. Then, the portion where the groove is formed is easily deformed.

Further, the pitch P1 of the first groove 21 may be wider than the pitch P2 of the second groove 22. As a result, the end portion 12 and the end portion 13 can be bent more easily than the central portion 11. For example, the pitch P1 of the first groove 21 may be twice or more the pitch P2 of the second groove 22.
Further, the number of the first groove 21 and the second groove 22 is not limited, and is appropriately set according to the curved surface to be attached.

In addition to this, the number of first grooves 21 formed per unit length in the width direction W at the central portion 11 is formed per unit length in the width direction W at the end portions 12 and 13. It may be less than the number of 2 grooves 22.
Even when the depth D1 and width W1 of the first groove 21 and the depth D2 and width W2 of the second groove 22 are the same, a large number of portions are formed per unit length in the width direction W. Is easy to bend. Therefore, by adjusting the number of grooves formed per unit length in the width direction W, the end portion 12 and the end portion 13 can be made easier to bend than the central portion 11.

In the above configuration, the core material 3 is not particularly limited, but the core material 3 can maintain its thickness against atmospheric pressure when sealed under reduced pressure, has a high porosity, and has a low solid thermal conductivity. Can be used. For example, an inorganic powder aggregate, particularly silica powder, or an inorganic fiber aggregate, particularly a glass fiber aggregate, can be used.

The material of the water adsorbent 4 is not particularly limited, but a material having a large binding energy with the water once adsorbed and a large amount of adsorbed per unit weight is preferable, and for example, calcium oxide, potassium oxide or the like is used. Can be done.

Further, the outer cover material 2 is not particularly limited, but it is excellent in gas barrier property, and even if the vacuum heat insulating material is stored in the atmosphere, a material having a small amount of air entering the inside can be used.
For example, a gas permeability of 104 [cm ³ / m ² · day · atm] or less can be used, preferably 103 [cm ³ / m ² · day · atm] or less, and more preferably 102 [. cm ³ / m ² · day · atm] or less can be used.
As a material satisfying such properties, a bag made of a plastic laminated film having a gas barrier layer can be used. The gas barrier layer is not particularly limited, but may be a metal foil such as an aluminum foil, or a plastic film on which a metal such as aluminum, silica, carbon, or the like is vapor-deposited.

Next, a method of forming the vacuum heat insulating material 1 will be described.
The first means for forming the vacuum heat insulating material 1 is to insert the flat plate-shaped core material 3 into the bag-shaped outer cover material 2, evacuate the inside of the outer cover material 2, and vacuum-pack the core material 3. To do. Then, the first groove 21 and the second groove 22 are formed in the vacuum heat insulating material 1 by press working from above the outer cover material 2. Therefore, the vacuum heat insulating material 1 that can be easily attached to the curved surface can be obtained from the flat plate vacuum heat insulating material.
When the cross-sectional shape of the first groove 21 and the second groove 22 is V-shaped, a V-shaped cross-sectional shape is used, and when the cross-sectional shape is U-shaped or rectangular. The corresponding cross-sectional shape mold is used.

The means for forming the second vacuum heat insulating material 1 is to form the first groove 21 and the second groove 22 in the flat plate-shaped core material 3, and then insert the core material 3 into the outer cover material 2 for vacuum packaging. Then, when the core material 3 is vacuum-packed, stress is generated in the outer cover material 2 on the side where the first groove 21 and the second groove 22 are formed, and the core material 3 is curved.
Since it is curved due to the shape of the core material 3, the load applied to the outer cover material 2 can be reduced.
Further, the core material 3 may be pressed to form the first groove 21 and the second groove 22, or the core material 3 may be cut to form the core material 3.

In FIG. 1, the first groove 21 and the second groove 22 are arranged on one main surface 10 of the vacuum heat insulating material 1, but the first groove 21 and the second groove 22 are both sides of the vacuum heat insulating material 1. May be formed in.

Next, the usage state of the vacuum heat insulating material 1 will be described with reference to FIG.
The stress from the outer cover material 2 is applied to the portions of the vacuum heat insulating material 1 where the first groove 21 and the second groove 22 are formed. Therefore, as shown in FIG. 2, the shape is curved with the main surface 10 inside.

As described above, since the first groove 21 is formed shallower than the second groove 22, the central portion 11 is more difficult to bend than the end portion 12 and the end portion 13. Therefore, in the vacuum heat insulating material 1, the curvatures of the end portion 12 and the end portion 13 are larger than the curvature of the central portion 11. That is, in the vacuum heat insulating material 1, the radius of curvature R2 of the end portion 12 and the radius of curvature R3 of the end portion 13 are smaller than the radius of curvature R1 of the central portion 11.
In addition, in order to make the central portion 11 more difficult to bend than the end portion 12 and the end portion 13, as described above, the pitch P1 of the first groove 21 may be wider than the pitch P2 of the second groove 22, or the pitch P2 of the first groove 21 The width W1 may be narrower than the width W2 of the second groove 22.
Since the curvature of the central portion 11 is formed to be small, when the vacuum heat insulating material 1 is placed on a flat table or the like, the height H can be lowered from the table at the ends 12a and 13a.

Next, the heat insulating box body 6 using the vacuum heat insulating material 1 will be described.
As shown in FIG. 3, the heat insulating box body 6 contains a cylindrical tank 5 which is a heat and cold insulation container. Then, the vacuum heat insulating material 1 is attached to the outer peripheral surface 51 of the tank 5. The outer peripheral surface 51 is the construction surface of the vacuum heat insulating material 1, and the vacuum heat insulating material 1 is closely attached to the outer peripheral surface 51.
In the vacuum heat insulating material 1, the central portion 11 is wound around the outer peripheral surface 51 after the end portion 12 is attached to the outer peripheral surface 51 of the tank 5. Then, a force F is applied to the end portion 13 so that the end portion 13 is aligned with the outer peripheral surface 51.
The tank 5 to which the vacuum heat insulating material 1 is attached is housed in the housing 61 of the heat insulating box body 6. A heat insulating material may be further arranged between the housing 61 and the vacuum heat insulating material 1.

Next, the operation of the present embodiment will be described.
When the vacuum heat insulating material 1 is attached to the outer peripheral surface 51 of the tank 5, since the end portion 12 and the end portion 13 are curved, the amount of deformation of the end portion 12 and the end portion 13 can be reduced. Therefore, the force for deforming and attaching the end portion 12 and the end portion 13 is reduced. In particular, by setting the curvature of the end portion 12 and the end portion 13 to be equal to or greater than the curvature of the outer peripheral surface 51, it is possible to easily suppress the lifting of the end portion 12 and the end portion 13 from the outer peripheral surface 51.
Then, the gap between the tank 5 and the vacuum heat insulating material 1 can be reduced, and the heat and cold insulation performance of the tank 5 can be improved.

Regarding the attachment of the vacuum heat insulating material 1 to the outer peripheral surface 51, for example, the end portion 12 is attached to the outer peripheral surface 51, and the vacuum heat insulating material 1 is wound around the tank 5 while being in close contact with the outer peripheral surface 51. Since the central portion 11 receives a force from the end portion 12 side and the end portion 13 side, it can be efficiently deformed even if the curvature is small.

Further, when the depth D1 of the first groove 21 is shallow and the width W1 is narrow or the pitch P1 is wide in the central portion 11, the decrease in the thickness of the core material 3 can be suppressed in the central portion 11. As a result, the heat insulating efficiency of the vacuum heat insulating material 1 is improved.
In particular, when grooves are formed by compression of the core material 3, since there are few grooves formed in the central portion 11, it is possible to reduce the dense portion of the core material 3, or compare the densities of the core materials 3. It can be lowered. Therefore, the influence of the formation of the first groove 21 on the heat insulating performance of the central portion 11 can be reduced.
Further, by forming the first groove 21 having the same depth evenly in the central portion 11, the load on the outer cover material 2 can be reduced, and the influence of the outer cover material 2 on the gas barrier property can be reduced. ..

Then, when the vacuum heat insulating material 1 is conveyed, the height H of the vacuum heat insulating material 1 can be kept low, so that the efficiency of the transfer can be improved.
When the vacuum heat insulating material 1 is placed on the table with the main surface 10 facing up, the height H of the vacuum heat insulating material 1 is suppressed to be low because the curvature of the central portion 11 is small. Therefore, the vacuum heat insulating material 1 is less bulky than the case where the curvature of the central portion 11 is large, and the vacuum heat insulating material 1 can be efficiently conveyed.
Further, even when the vacuum heat insulating material 1 is bent due to the vertical vibration during transportation, the distance that the end portion 12 and the end portion 13 move due to the bending can be reduced. As a result, the load received on the vacuum heat insulating material 1 due to transportation or the like can be reduced.

(Example 1)
Next, Example 1 of the vacuum heat insulating material in the first embodiment will be described.
Glass wool was used as the core material 3 of the vacuum heat insulating material 1 of Example 1. The size of the core material 3 was 410 mm in length × 1020 mm in width × 15 mm in thickness, and the weight was 1520 g.
Calcium oxide was used as the water adsorbent 4. The weight was 15 g. The water adsorbent 4 was arranged substantially in the center with respect to the width direction and the vertical direction of the core material 3.

Two types of films were used for the outer cover material 2.
For one surface to be the main surface 10, a composite film in which a 15 μm nylon layer, a 25 μm nylon layer, a 6 μm aluminum layer, and a 50 μm low-density polyethylene layer were laminated was used.
On the other surface, a 25 μm nylon layer, a 12 μm polyester terephthalate layer vapor-deposited with aluminum, a 12 μm ethylene vinyl alcohol resin layer vapor-deposited with aluminum, and a 50 μm low-density polyethylene layer were used.
The low-density polyethylene layers of the above two types of films were opposed to each other, and the peripheral edges were heat-welded to form a bag.

A plurality of grooves were formed on the main surface 10 of the vacuum heat insulating material 1 in parallel with the vertical direction. The range of 200 mm in the width direction from both ends of the vacuum heat insulating material 1 was defined as the end portion 12 and the end portion 13, respectively. Then, the space between the end portion 12 and the end portion 13 is defined as the central portion 11.
The second groove 22 formed in the end portion 12 and the end portion 13 was formed with a pitch P2 of 20 mm and a depth D2 of 8 mm.
The first groove 21 formed in the central portion 11 was formed with a pitch P1 of 50 mm and a depth D1 of 3 mm.
The first groove 21 and the second groove 22 were formed by compressing the core material 3 by a die press.

The water adsorbent 4 used was 60 mm × 188 mm in which a packaging material of 60 mm × 94 mm was continuously packaged. This is in consideration of the possibility that the moisture adsorbent 4 is compacted together with the core material 3 when the surface of the vacuum heat insulating material 1 is smoothed by a roll press or the like, and the vacuum heat insulating material 1 becomes difficult to bend. The size of the water adsorbent 4 is not limited to this, and for example, 60 mm × 230 mm in which a packaging material of 30 mm × 230 mm is continuously packaged can be used.

The first groove 21 was not formed at the portion where the water adsorbent 4 was arranged. Further, even if the pitch of the first groove 21 is 60 mm or more, the moisture adsorbent 4 is arranged close to one side in the width direction of the central portion 11, and a flat portion of 60 mm × 60 mm or more is formed on the other side of the central portion 11. Good. Then, for example, a heat flow meter or the like may be arranged on this flat surface portion and used in the inspection step of the vacuum heat insulating material 1 after grooving.

(Comparative Example 1)
Next, Comparative Example 1 of the vacuum heat insulating material will be described.
In Comparative Example 1, the vacuum heat insulating material of Example 1 is the same except for the arrangement of the grooves, the depth of the grooves, and the pitch of the grooves.
In the vacuum heat insulating material of Comparative Example 1, a plurality of grooves were formed on one main surface of the vacuum heat insulating material in parallel with the vertical direction. The depth of each groove was 8 mm, and the grooves were evenly arranged at a pitch of 20 mm.

(Comparison method)
Regarding the vacuum heat insulating materials of Example 1 and Comparative Example 1, the workability on the cylindrical construction surface and the bending amount of the vacuum heat insulating material were compared.
As a guideline for workability, as shown in FIG. 3, the vacuum heat insulating material is wound around the construction surface with one end of the vacuum heat insulating material attached to the cylindrical construction surface, and the other end is aligned with the construction surface. The force F required for the was measured. As the construction surface, the outer peripheral surface 51 of the tank 5 for a water heater having a diameter of 350 mm was used.
As a guideline for the amount of bending, as shown in FIG. 2, the vacuum heat insulating material was placed on a flat surface with the main surface in which the groove was formed facing upward, and the height H from the flat surface was measured at the end in the width direction. The height H corresponds to the amount of bending of the vacuum heat insulating material.

As a result, in the vacuum heat insulating material of Example 1, the curvature of the end portion 12 and the end portion 13 was larger than the curvature of the central portion 11.
Then, in Example 1, the force F required to follow the construction surface was 43N, and the height H from the plane was 25 mm.
In Comparative Example 1, the force F required to follow the construction surface was 60 N, and the height H from the plane was 32 mm.

From this numerical value, it was shown that the vacuum heat insulating material of Example 1 requires less force during construction than that of Comparative Example 1. This indicates that the labor required to attach the vacuum heat insulating material to the construction surface without gaps is reduced.
Then, it was shown that the bending amount of the vacuum heat insulating material of Example 1 was smaller than that of Comparative Example 1. This indicates that the vacuum heat insulating material of Example 1 has better loading efficiency during transportation than that of Comparative Example 1. Further, it is shown that the vacuum heat insulating material of Example 1 is less susceptible to vibration and the like than the vacuum heat insulating material of Comparative Example 1, and has high durability during transportation.

Further, in Example 1, considering the influence of the core material density on the thermal conductivity, it is considered that the heat insulating performance of the portion processed to the groove depth of 8 mm is 65% lower than that of the unprocessed portion. Be done. Then, the deterioration of the heat insulating performance of the portion processed to the groove depth of 3 mm can be suppressed to 25%.
Therefore, it is presumed that Example 1 in which the groove depth is shallow in the central portion 11 has higher heat insulating performance than Comparative Example 1.

As described above, in the present embodiment, the flat core material 3 and the outer cover material 2 covering the core material 3 are provided, and the first groove 21 is provided in the central portion 11 of the core material 3 in the width direction W. Is formed, and a second groove 22 is formed in the two end portions 12 and the end portion 13 of the core material 3 that sandwiches the central portion 11 in the width direction W, and the two end portions are in a state where the core material 3 is vacuum-sealed. The curvature of the 12 and the end portion 13 is formed to be larger than the curvature of the central portion 11.
According to this, when the vacuum heat insulating material 1 is attached to a curved surface such as a circumferential surface, the end portion 12 and the end portion 13 are less likely to float than the curved surface, and the labor for attaching the vacuum heat insulating material 1 to the curved surface is reduced. .. Further, when the vacuum heat insulating material 1 is transported, the vacuum heat insulating material 1 is not bulky. Then, when the vacuum heat insulating material 1 is loaded on a flat table, the amount of deformation due to vibration or load can be reduced, and the load received by the vacuum heat insulating material 1 during transportation can be reduced. In addition, stress due to deformation applied to the outer cover material 2 during transportation is reduced.

Further, in the present embodiment, the depth D2 of the second groove 22 is formed deeper than the depth D1 of the first groove 21.
According to this, the end portion 12 and the end portion 13 are easily bent, and the curvature of the end portion 12 and the end portion 13 can be made larger than the curvature of the central portion 11. Then, the curvatures of the end portion 12 and the end portion 13 can be easily increased. Further, the thickness of the vacuum heat insulating material 1 is difficult to reduce in the central portion 11, and the heat insulating performance can be ensured while improving the mountability of the vacuum heat insulating material 1 on the curved surface.

Further, in the present embodiment, the pitch P2 between the second grooves 22 is narrower than the pitch P1 between the first grooves 21.
According to this, the end portion 12 and the end portion 13 are more easily bent than the central portion 11, and the curvature of the end portion 12 and the end portion 13 can be increased.

In the present embodiment, the width W2 of the second groove 22 is formed wider than the width W1 of the first groove 21.
According to this, the end portion 12 and the end portion 13 are easily bent, and the curvature of the end portion 12 and the end portion 13 can be increased. Then, it is difficult to reduce the thickness of the vacuum heat insulating material 1 at the central portion 11, and it is possible to improve the mountability of the vacuum heat insulating material 1 on the curved surface and secure the heat insulating performance.

In the present embodiment, the number of lines formed per unit length in the width direction W is larger in the second groove 22 than in the first groove 21.
According to this, the end portion 12 and the end portion 13 can be easily bent. Then, the curvatures of the end portion 12 and the end portion 13 can be increased.

In the present embodiment, the water adsorbent 4 is arranged at the central portion 11 of the core material 3.
According to this, the moisture in the vacuum heat insulating material 1 can be efficiently adsorbed on the moisture adsorbent 4. Further, the water adsorbent 4 can be arranged at a position that does not easily affect the curvature of the end portion 12 and the end portion 13.

In the present embodiment, the heat insulating box 6 containing the tank 5 which is a container to which the vacuum heat insulating material 1 is attached is configured.
According to this, it is possible to easily attach the vacuum heat insulating material 1 to the tank 5 at the time of manufacturing the heat insulating box body 6. Further, since the gap between the tank 5 and the vacuum heat insulating material 1 can be reduced, the heat insulating box body 6 having high heat insulating efficiency can be manufactured.

It should be noted that the present embodiment shows one aspect to which the present invention is applied, and the present invention is not limited to the above-described embodiment.
For example, in the present embodiment, the case where the cross-sectional shapes of the first groove 21 and the second groove 22 are V-shaped has been described, but the cross-sectional shapes of the first groove 21 and the second groove 22 are the above-mentioned V. It is not limited to the character shape. The cross-sectional shape of the first groove 21 and the second groove 22 may be a shape that makes the vacuum heat insulating material 1 easy to bend, and may be a U shape or a rectangular shape. Further, the cross-sectional shapes of the first groove 21 and the second groove 22 may be different, and the first groove 21 may be omitted in the central portion 11.

Further, the formation of the first groove 21 and the second groove 22 is not limited to the press working of the vacuum heat insulating material 1 or the core material 3 by a mold or the like. The portion of the core material 3 that forms the first groove 21 and the second groove 22 may be removed in advance. Further, the density of the core material 3 in the portion forming the first groove 21 and the second groove 22 is lowered, or the density of the core material 3 other than the portion in which the first groove 21 and the second groove 22 are formed is increased. You may do it.

Further, depending on the curved surface on which the vacuum heat insulating material 1 is mounted, even if only one of the depth D2 or the width W2 of the second groove 22 is increased with respect to the depth D2 and the width W2 of the first groove 21. good. Then, the first groove 21 and the second groove 22 may be formed to have the same depth and width so that the pitch P1 between the first grooves 21 is wider than the pitch P2 between the second grooves 22. Further, these may be combined to make the curvature of the end portion 12 and the end portion 13 larger than the curvature of the central portion 11.

Further, the first groove 21 and the second groove 22 may be formed as long as the vacuum heat insulating material 1 is curved, and may be formed so as to be inclined with respect to the length direction D, may be formed in a broken line shape, or may be formed in a zigzag shape. You may.

As described above, the vacuum heat insulating material according to the present invention can be suitably used as a heat insulating material mounted on a curved surface.

1 Vacuum heat insulating material 2 Outer cover material 3 Core material 5 Tank (container)
6 Insulated box 10 Main surface 11 Central part 12 End part 13 End part 21 1st groove 22 2nd groove D1 Depth (1st groove)
D2 depth (second groove)
P1 pitch (1st groove)
P2 pitch (second groove)
W1 width (1st groove)
W2 width (second groove)

Claims (7)

1. A flat core material and an outer cover material that covers the core material are provided.
   A first groove is formed in the core material at the center in the width direction.
   Second grooves are formed at the two ends of the core material that sandwiches the central portion in the width direction.
   In the state of being sealed under reduced pressure, the deformation of the core material is
   A vacuum heat insulating material characterized in that the curvature of the two end portions is formed larger than the curvature of the central portion.
2. The vacuum heat insulating material according to claim 1, wherein the depth of the second groove is formed deeper than the depth of the first groove.
3. The vacuum heat insulating material according to claim 1 or 2, wherein the pitch of the second groove is narrower than the pitch of the first groove.
4. The vacuum heat insulating material according to any one of claims 1 to 3, wherein the width of the second groove is formed wider than the width of the first groove.
5. The vacuum heat insulating material according to any one of claims 1 to 4, wherein the number of the vacuum heat insulating material formed per unit length in the width direction is larger than that of the first groove.
6. The vacuum heat insulating material according to any one of claims 1 to 5, wherein the moisture adsorbent is arranged in the central portion of the core material.
7. A heat insulating box body using the vacuum heat insulating material, which comprises incorporating the container to which the vacuum heat insulating material according to claims 1 to 6 is attached.

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