JP7482437B2 - Method for producing vacuum insulation material, method for producing vacuum insulation container, and method for producing thermal insulation bag - Google Patents

Description

The present invention relates to a vacuum insulation material , an insulating container , and a thermal insulation bag .

2. Description of the Related Art Conventionally, a vacuum insulation material has been known which is formed by vacuum-sealing a core material with an outer covering material having gas barrier properties and folding the core material at intended folding portions (see Patent Document 1).
In this type of conventional vacuum insulation material, an adsorbent is disposed inside the vacuum insulation material to adsorb moisture and gases inside the insulation material.

JP 2015-078707 A

However, in conventional configurations, when the vacuum insulation material is bent at the intended bending portion, it cannot be bent accurately. Generally, the adsorbent is placed in the core material and is enclosed together with the outer covering material. However, the core material and the adsorbent have different bending properties. Therefore, when bending a core material portion containing an adsorbent and a core material portion not containing an adsorbent together, there is a problem that the desired bending property cannot be ensured. Also, in order to perform bending at the desired position, grooves are usually made by hollowing out the core material or pressing to give the material a bending tendency, but this causes problems such as increased costs due to the number of processing steps and reduced long-term reliability of the vacuum insulation material.

In view of the above problems, the present invention aims to provide a vacuum insulation material and an insulated container that can be folded accurately while ensuring the desired foldability.

The present invention relates to a method for producing a vacuum insulation material in which a core material is vacuum-sealed with an outer covering material having gas barrier properties and then folded at a planned folding portion, in which an adsorbent that adsorbs moisture and gas is placed inside the insulation material, and the planned folding portion is located in a position that does not overlap with the position where the adsorbent is placed, and is provided along the boundary between the position where the adsorbent is placed and the position where the adsorbent is not placed in the core material.

According to the present invention, the intended bending portion is provided at a position that does not overlap with the position where the adsorbent is disposed, so that when the vacuum insulation material is bent at the intended bending portion, the core material portion that contains the adsorbent and the core material portion that does not contain the adsorbent are not bent together, ensuring the desired foldability and enabling the material to be bent at the desired position without additional processing to impart a bending tendency.

According to the present invention, when bending the vacuum insulation material at the intended bending portion, the desired bending properties can be ensured.

FIG. 1(A) is a plan view showing a vacuum insulation material, and FIG. 1(B) is a perspective view of a vacuum insulation container. 2A, 2B, 2C, and 2D are plan views showing modified examples of the notch. 3(A) and 3(B) are diagrams showing another embodiment of the vacuum insulation material. FIG. 4(A) is a diagram showing another embodiment of a vacuum insulation container, and FIG. 4(B) is a top view of FIG. 4(A). FIG. 5(A) is a diagram showing another embodiment of a vacuum insulation container, and FIG. 5(B) is a top view of FIG. 5(A). FIG. 6(A) is a diagram showing another embodiment of a vacuum insulation container, and FIG. 6(B) is a top view of FIG. 6(A). A perspective view of a vacuum insulated container

The first invention is a vacuum insulation material formed by vacuum sealing a core material with an outer covering material having gas barrier properties and folding the core material at a planned folding portion, in which an adsorbent that adsorbs moisture and gas is placed inside the insulation material, and the planned folding portion is provided in a position that does not overlap with the position where the adsorbent is placed, and is aligned with the position where the adsorbent is placed.
According to the above configuration, the intended bending portion is provided at a position that does not overlap with the position where the adsorbent is arranged, so that when the vacuum insulation material is folded at the intended bending portion, the core material portion containing the adsorbent and the core material portion not containing the adsorbent are not folded together, thereby ensuring the desired foldability.
In addition, when the vacuum insulation material is folded at the intended folding portion, the hard portion of the core material containing the adsorbent becomes the folding starting point, and the desired folding property can be easily ensured. In the folding process, the folding process is performed at the desired position, so grooves are usually made by hollowing out the core material or pressing to give the material a folding tendency, but this process is unnecessary. When the material is folded at the adsorbent portion, the adsorbent may tear the outer covering material, making it impossible to maintain the vacuum, but this can be avoided.

A second aspect of the present invention is one which has a notch into which the adsorbent is fitted.
According to the above-mentioned configuration, the task of placing the adsorbent on the core material becomes easier, and by placing the adsorbent at a targeted position, it becomes possible to perform the folding process at an accurate position.

The third invention is a vacuum insulated container formed by folding a vacuum insulation material formed by vacuum sealing a core material with an outer covering material having gas barrier properties at a planned folding portion, in which an adsorbent that adsorbs moisture and gas is placed inside the vacuum insulation material, the planned folding portion is in a position that does not overlap with the position where the adsorbent is placed, and the planned folding portion is provided along the position where the adsorbent is placed.
According to the above configuration, the intended bending portion is provided at a position that does not overlap with the position where the adsorbent is arranged, so that when the vacuum insulation material is folded at the intended bending portion, the core material portion containing the adsorbent and the core material portion not containing the adsorbent are not folded together, thereby ensuring the desired foldability.
Furthermore, when the vacuum insulation material is folded at the intended folding portion, the hard portion of the core material containing the adsorbent becomes the folding starting point, and the desired folding property can be easily ensured. In the folding process, grooves are usually formed by hollowing out the core material or pressing to impart a folding tendency, but these processes are not necessary. When the vacuum insulation material is folded at the adsorbent portion, the adsorbent may tear the outer covering material, making it impossible to maintain the vacuum. This can be avoided, and the folding process can be performed at the desired position without additional processing to impart a folding tendency, making it possible to provide a vacuum insulation material with little increase in cost due to processing man-hours and little decrease in long-term reliability.

The fourth invention is one in which an absorbent is provided on one or both of the opposing surfaces of the bag body, and when cargo is inserted, the opposing surfaces are folded in a tortoiseshell shape with the absorbent part serving as the folding starting point.
According to the above configuration, the capacity of the insulating container can be increased.

The fifth invention is one in which an adsorbent is provided on one or both of the opposing surfaces of the bag body, and when cargo is inserted, the opposing surfaces are folded into a box shape with the adsorbent portion serving as the folding starting point.
According to the above configuration, the capacity of the insulating container can be increased.

In a sixth aspect of the present invention, the core material has a slit into which the adsorbent is fitted.
According to the above-mentioned configuration, the task of placing the adsorbent on the core material becomes easier, and by placing the adsorbent at a targeted position, it becomes possible to perform the folding process at an accurate position.

In a seventh aspect of the present invention, the outer covering material has a foil film layer on its front surface and a vapor-deposited film layer on its back surface, and is folded so that the foil film layer is on the outside and the vapor-deposited film layer is on the inside.
According to the above-mentioned configuration, the gas barrier properties of the outer covering material can be maintained, and the flow of heat inside the insulated container can be reduced.

An eighth aspect of the present invention is provided with a thermal insulation bag formed of polyethylene or polyurethane and an aluminum layer.
According to the above configuration, the heat-insulating container can maintain high heat retention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an embodiment of the present invention.
In FIG. 1A, reference numeral 11 denotes a vacuum insulation material.
The vacuum insulation material 11 is in sheet form and comprises an outer covering material 12 and a core material 13 .
The following shows an example of a manufacturing procedure for the vacuum insulation material 11. The outer covering material 12 has a rectangular shape in a plan view and is formed into a bag shape with one side open.
The rectangular plate-shaped core material 13 is inserted from one open side of the outer covering material 12, and the same side is vacuum-suctioned to create a reduced pressure state, and then the one side is heat-sealed to manufacture the vacuum insulation material 11. In this state, the vacuum insulation material 11 has end non-insulated portions 21, 22 and side non-insulated portions 24, 25 as portions heat-sealed to the outer periphery of the core material 13.

The non-insulated end portions 21, 22 are folded as shown by arrows A and B and adhered to the outside of the vacuum insulation material 11. The non-insulated end portions 21, 22 may be adhered to the inside of the vacuum insulation material 11. The vacuum insulation material 11 is also folded along the intended folding portion (bisector) 114 as shown by arrow C. Fig. 1(B) shows the material folded along the intended folding portion.
In this state, the non-insulated side portions 24, 25 are folded as shown by arrows D and E and are respectively adhered to the surfaces of the vacuum insulation material 11. The non-insulated side portions 24, 25 may be respectively adhered to one surface and the other surface of the vacuum insulation material 11. In this way, a bag body (hereinafter, vacuum insulation container) 1 is formed in which an opening 27 is formed in the non-insulated portion 21 at one end portion.

According to another manufacturing procedure, a bag body having an opening formed in one of the non-insulated side portions 24 may be formed by folding one of the non-insulated side portions 24 and adhering it to the vacuum insulation material 11, folding the vacuum insulation material 11 along the intended folding portion 114, and folding the other non-insulated side portion 25 and the end non-insulated portion 21 and adhering them to the vacuum insulation material 11.
The non-insulated end portions 21, 22 and the non-insulated side portions 24, 25 are bonded together by, for example, adhesive tape.
By bonding with adhesive tape, the unevenness that occurs when the non-insulated end portions 21, 22 and the non-insulated side portions 24, 25 are folded and bonded is covered with the adhesive tape, so that the outer surface of the vacuum insulated container 1 can be formed smoothly. However, this is not limiting, and adhesives, welding, etc. may also be used.

The outer covering material 12 may be any material that suppresses the intrusion of outside air into the vacuum insulation material 11 and has flexibility. For example, the outer covering material 12 may be a laminate of a heat-sealed film, a gas barrier film as an intermediate layer, and a surface protection film as an outermost layer. A resin film such as a low-density polyethylene film is suitable as the heat-sealed film of the outer covering material 12. A known film having gas barrier properties can be suitable as the gas barrier film.

In this embodiment, the outer covering material 12 has a foil film layer on its front surface and a vapor deposition film layer on its back surface, and the vacuum insulated container 1 is formed by folding the outer covering material 12 so that the foil film layer is on the outside and the vapor deposition film layer is on the inside.
In this case, the inner vapor-deposited film layer is preferably made of aluminum-deposited polyethylene phthalate (VM-PET), aluminum-deposited ethylene vinyl alcohol copolymer (VM-EVOH), etc., and the outer foil film layer is preferably made of aluminum foil laminate film, etc.
The outer aluminum foil layer has a better thermal conductivity than the inner aluminum vapor deposition layer. This configuration prevents heat from entering from the outside, improving the insulation effect. The aluminum vapor deposition layer is located on the inside, allowing the inside of the container to be heated uniformly.

The core material 13 is formed into a sheet shape, for example, by stacking chopped strand mats. Chopped strand mats are made by cutting glass fiber strands, randomly dispersing the fibers, and forming them into a sheet shape using a binder. For example, it is formed by stacking chopped strand mats with a thickness of 0.5 mm, and is formed so that the thickness in a reduced pressure state is, for example, 2 mm to 3 mm.

By using the core material 13 in which the chopped strand mats are laminated, the fiber direction of the core material 13 is perpendicular to the thickness direction of the core material 13, making it difficult for heat to be transmitted in the thickness direction of the core material 13. In other words, the heat conductivity of the core material 13 can be reduced.
By setting the thickness of the core material 13 in a reduced pressure state to 2 mm to 3 mm, a flexible vacuum insulation material 11 can be formed.
The core material 13 is not limited to the chopped strand mat, and any material may be used as long as it has heat insulating properties and flexibility.

In this embodiment, as shown in Fig. 1 (A), a pair of adsorbents 14 are arranged above and below the intended folding portion 114 of the core material 13. The adsorbents 14 adsorb moisture and gas within the outer covering material 12, maintaining the insulating performance of the vacuum insulation material 11, and adsorbing moisture that permeates and invades from the outside over time. Four slits 113 are formed on the top and bottom of the core material 13. Ends of the adsorbents 14 are fitted into the four slits 113 of the core material 13. This allows the adsorbents 14 to be accurately positioned relative to the core material 13.
The shape and number of the slits are not important as long as the slits can fix the adsorbent 14. Fig. 2 is a diagram showing modified examples of the slits. The slit may be, for example, a single slit 113 as shown in Fig. 2(A), a U-shaped slit 123 as shown in Fig. 2(B), an L-shaped slit 124 as shown in Fig. 2(C), or an I-shaped slit 125 as shown in Fig. 2(D).
A U-shaped notch 123 shown in Fig. 2B, an L-shaped notch 124 shown in Fig. 2C, and an I-shaped notch 125 shown in Fig. 2D are formed around the adsorbent 14. The notches 123, 124, and 125 are recessed in the thickness direction of the core material 13 by creating a reduced pressure state when forming the vacuum insulation material 11. Thus, the outer covering material 12 facing the notches 123, 124, and 125 deforms in a direction approaching each other. Therefore, the adsorbent 14 can be fixed by the outer covering material 12. This configuration is not limited to one in which a pair of adsorbents 14 is arranged, and the number of adsorbents 14 is not limited.

In the present embodiment, since the adsorbent 14 is fitted into the slits 113, the position of the adsorbent 14 does not shift when the inside of the outer covering material 12 is suctioned by vacuum and put into a reduced pressure state. The positioning of the adsorbent 14 is not limited to the slits 113.
For example, positioning marks may be provided so as to surround the position of the adsorbent 14 or to indicate a reference for the position of the adsorbent 14. The positioning marks may be cut by a press, which is formed at the same time as the core material 13 is cut.

The specific type of adsorbent 14 is not particularly limited, and representative examples include materials (physical adsorbents) that exhibit physical moisture adsorption properties, such as silica gel, activated alumina, activated carbon, metal-based adsorbents, and zeolites. Furthermore, examples of moisture adsorbents include materials (chemical adsorbents) that exhibit chemical moisture adsorption properties, such as oxides or hydroxides of alkali metals and alkaline earth metals. Only one of these materials may be used as adsorbent 14, or two or more types may be used in appropriate combination as adsorbent 14.

A gas adsorbent may be enclosed inside the outer covering material 12 together with the adsorbent 14. The gas adsorbent may be capable of adsorbing and removing gas components remaining inside the outer covering material 12, i.e., inside the vacuum insulation structure, or gas components that permeate and invade from the outside over time. Here, the gas adsorbent may have at least gas adsorption properties, but may also have moisture adsorption properties in addition to gas adsorption properties. The moisture adsorption properties of the gas adsorbent are basically the property of adsorbing water vapor, and can be considered as part of the gas adsorption properties.

The specific type of gas adsorbent is not particularly limited, and similar to the adsorbent 14 described above, known materials such as silica gel, activated alumina, activated carbon, metal-based adsorbents, and zeolites can be suitably used. Only one of these materials may be used as the gas adsorbent, or two or more types may be appropriately combined and used as the gas adsorbent. In particular, in the present disclosure, ZSM-5 zeolite that has been subjected to copper ion exchange (copper ion-exchanged ZSM-5 zeolite) can be suitably used as the gas adsorbent.

Copper ion-exchanged ZSM-5 zeolite has excellent adsorption capabilities not only for the air components nitrogen and oxygen, but also for moisture (water vapor). Therefore, if the gas adsorbent uses copper ion-exchanged ZSM-5 zeolite, it can also serve as the adsorbent 14, and can effectively adsorb and remove air components that could not be exhausted by the vacuum pump during the manufacture of the vacuum insulation material 11, trace amounts of gas that are generated over time inside the vacuum insulation material 11, and air components or moisture that permeate and infiltrate from the outside to the inside of the vacuum insulation material 11 over time. As a result, the vacuum insulation material 11 can achieve excellent insulation performance for a long period of time.

The form in which the adsorbent 14 and gas adsorbent are used is not particularly limited, and examples thereof include powder, a powder package, and a powder molded body. If the gas adsorbent is copper ion-exchanged ZSM-5 type zeolite, examples thereof include a molded body obtained by molding the powder into a predetermined shape. The amount of the adsorbent 14 and gas adsorbent used is also not particularly limited, and it is sufficient that the reduced pressure state (near vacuum state) inside the outer covering material 12 of the vacuum insulation material 11 can be maintained satisfactorily.

In this embodiment, the position where the adsorbent 14 is disposed does not overlap with the position of a portion to be folded 114 when folded in a later process, as shown in FIG.
The portion of core material 13 containing adsorbent 14 becomes harder than the portion of core material 13 not containing adsorbent 14, and when the portion of core material 13 containing adsorbent 14 is bent, the intended foldability as designed cannot be ensured.

In this embodiment, the intended bending portion 114 is provided at a position that does not overlap with the position where the adsorbent 14 is disposed. Therefore, when the vacuum insulation material 11 is bent at the intended bending portion 114, the portion of the core material 13 that contains the adsorbent 14 and the portion of the core material 13 that does not contain the adsorbent 14 are not bent together, and the desired foldability can be ensured.

3A and 3B show another embodiment, in which the same components as those in FIG. 1 are denoted by the same reference numerals and detailed description thereof will be omitted.
In this vacuum insulation material 111, the adsorbent 14 is disposed in the core material 13. The position at which the adsorbent 14 is disposed does not overlap with the position of the intended folding portion 114. The adsorbent 14 is disposed so as to follow the intended folding portion 114.

The portion of core material 13 containing adsorbent 14 becomes harder than the other portions of core material 13, but in this embodiment, adsorbent 14 is arranged along intended folding portion 114, so that during the folding process, the hard portion of core material 13 containing adsorbent 14 becomes the folding starting point, and the core material 13 is folded, so that the desired foldability can be easily ensured.
In the folding process, in order to ensure foldability and to perform folding processing at the desired folding position, grooves are usually created by hollowing out the core material or pressing to impart a folding tendency, but this processing is no longer necessary.
If the outer cover material 12 is bent at the portion of the adsorbent 14, the adsorbent 14 may break the outer cover material 12, making it impossible to maintain the vacuum, but this can be avoided.

4(A) and (B) show the vacuum insulated container 1. The same components as those in FIG. 1 are denoted by the same reference numerals, and detailed explanations thereof will be omitted.
The vacuum insulated container 1 is a bag having an opening 27, and includes a pair of opposing surfaces 6, 7. The opposing surfaces 6, 7 are rectangular, and a rectangular adsorbent 14 is provided in the center of each of the surfaces 6, 7. As in the above embodiment, the adsorbent 14 is disposed in the core material 13, and is contained in the outer cover material 12 in a reduced pressure state obtained by vacuum suction.

In this embodiment, when cargo 31 is inserted into the vacuum insulated container 1 through the opening 27, depending on the shape of the cargo 31, the rectangular portion of the core material 13 containing the adsorbent 14 is harder than the portion of the core material 13 not containing the adsorbent 14, so that the hard portion (the adsorbent) becomes the starting point for bending, and the opposing surfaces 6, 7 are folded so as to jut out in a tortoiseshell shape, as shown in Figure 4 (B).
That is, the opposing surfaces 6, 7 are provided with first intended folding portions 101-104 extending diagonally from the four corners A1-A4, respectively, and rectangular second intended folding portions 105 each continuing in a rectangular shape at the end of the first intended folding portions 101-104, and the second intended folding portions 104 surround the adsorbent 14.
When the opposing surfaces 6, 7 are folded, grooves are usually formed by pressing or the like to impart a folding tendency, but this processing is not necessary. Also, if the surface is folded at the part of the adsorbent 14, the adsorbent 14 may break the outer cover material 12, making it impossible to maintain the vacuum, but this can be avoided.

In this embodiment, when cargo 31 is inserted into the vacuum insulated container 1, the opposing surfaces 6, 7 are folded along the first planned folding portions 101-104 and the second planned folding portion 105 to form a tortoiseshell shape, thereby increasing the storage capacity of the vacuum insulated container 1.

5(A) and (B) show another embodiment of the vacuum insulated container 1. The same components as those in FIG. 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.
As shown in FIG. 5A, the vacuum insulation container 1 is a bag having an opening 27 and is provided with a pair of opposing surfaces 6 and 7 .
The opposing surfaces 6, 7 are rectangular, and a pair of adsorbents 14A, 14B are disposed on each of the surfaces 6, 7 so as to extend toward the opening 27. The pair of adsorbents 14A, 14B are disposed along the second intended bending portion 105.

In this embodiment, when cargo 31 is inserted into the vacuum insulated container 1, the opposing surfaces 6 and 7 are folded from the hard portion (the adsorbent) as the folding starting point along the first planned folding portions 101-104 and the second planned folding portion 105 into a tortoiseshell shape, as shown in Figures 5(A) and 5(B). This increases the storage capacity of the vacuum insulated container 1.

6(A) and (B) show another embodiment of the vacuum insulated container 1. The same components as those in Fig. 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.
6A, the vacuum insulated container 1 has third planned folding portions 106, 107 on the opposing surfaces 6, 7. The third planned folding portions 106, 107 extend in parallel toward the opening 27. The opposing surfaces 6, 7 also have a fourth planned folding portion 108, a fifth planned folding portion 109, and a sixth planned folding portion 110.
Two adsorbents 14C and 14D are provided on the outer sides of the third intended bending portions 106 and 107. The two adsorbents 14C and 14D are disposed along the third intended bending portions 106 and 107.

In this configuration, the cargo 31 is elongated. When the cargo 31 is inserted into the vacuum insulated container 1, the opposing surfaces 6, 7 deform in accordance with the shape of the cargo 31, as shown in FIG. 6(B). That is, the opposing surfaces 6, 7 are folded from the hard portion (the adsorbent) along the third planned fold portion 106, 107, the fourth planned fold portion 108, the fifth planned fold portion 109, and the sixth planned fold portion 110, so that the opening 27 side is released and becomes box-shaped, and the storage volume of the vacuum insulated container 1 is increased.

In either embodiment, when cargo 31 is inserted into the vacuum insulated container 1 through the opening 27, the rectangular portion of the core material 13 containing the adsorbent 14 is harder than the portion of the core material 13 that does not contain the adsorbent 14, so that the hard portion of the core material 13 (the adsorbent) becomes the starting point for folding, and the opposing surfaces 6, 7 are folded into a tortoiseshell or box shape, thereby increasing the storage volume of the vacuum insulated container 1.
The position and number of the adsorbent 14 are not limited to those mentioned above, and the shape of the opposing surfaces 6, 7 after they protrude is not limited to a tortoiseshell shape or a box shape, but can be changed as desired.

Next, a heat retention bag 51 using the vacuum insulation container 1 will be described.
7, the thermal insulation bag 51 includes a protective bag 53 that houses and protects the vacuum insulation container 1. The protective bag 53 is formed in a rectangular bag shape with an opening 52 on one side. The width dimension of the inner surface of the protective bag 53 is formed to be approximately the same as the width dimension of the vacuum insulation container 1.
The length from the inner bottom 55 of the protective bag 53 to the opening 52 is longer than the length from the bottom 5 of the vacuum insulation container 1 to the opening 2 .

The protective bag 53 is not particularly limited in its specific configuration, but may be a flexible bag made of a sheet with cushioning properties, capable of protecting the vacuum insulated container 1. For example, the protective bag 53 may be formed by laminating an aluminum-deposited polyethylene terephthalate film, a foamed polyethylene sheet, and a high-density polyethylene film to a sheet having a thickness of approximately 1 to 2 mm.

The vacuum insulation container 1 is housed inside the protective bag 53 so that the opening direction of the opening 2 coincides with the opening direction of the opening 52 of the protective bag 53 .
With the bottom 5 of the vacuum insulation container 1 abutting against the inner bottom 55 of the protective bag 53, the vacuum insulation container 1 and the protective bag 53 are adhered together to fix the vacuum insulation container 1 and the protective bag 53 together.
The vacuum insulation container 1 and the protective bag 53 are bonded together, for example, by double-sided tape 57 applied to the outer periphery of the opening 2 of the vacuum insulation container 1. The vacuum insulation container 1 and the protective bag 53 may also be bonded together by an adhesive.
With the vacuum insulated container 1 adhered to the protective bag 53, a part of the protective bag 53 longer than the vacuum insulated container 1 is made into a folding part 56, and the folding part 56 is folded with the vacuum insulated container 1 stored in the protective bag 53.

In this embodiment, when an object is to be inserted into the vacuum insulated container 1 , the opening 2 is opened and the object is inserted into the vacuum insulated container 1 .
In this case, each of the non-insulated end portions 21 and 22 is folded outward from the opening 2, so that the inside of the opening 2 can be formed smoothly, allowing items to be inserted and removed smoothly from the inside of the vacuum insulated container 1.

Since the core material 13 is formed thin, at approximately 2 mm to 3 mm, the vacuum insulated container 1 is flexible, the vacuum insulated container 1 can be easily deformed according to the shape of the items to be stored, and items can be easily put in and taken out of the vacuum insulated container 1.
In addition, since the vacuum insulated container 1 is bent and deformed to fit the stored object, the amount of gas present in the space inside the vacuum insulated container 1 can be reduced, and the heat retention of the vacuum insulated container 1 can be improved.

The opening 2 of the vacuum insulated container 1 may be closed while an article is being held inside.
By closing the opening 2, it is possible to prevent outside air from entering through the opening 2, thereby improving heat retention performance.

When aluminum is vapor-deposited onto a resin film on the inside of the gas barrier film of the vacuum insulated container 1, the metal layer of the inner gas barrier film is made thin. This reduces the heat bridge phenomenon, in which heat is transferred through the metal layer of the gas barrier film, compared to when a gas barrier film made of metal foil is used.

Since the vacuum insulated container 1 is stored in the protective bag 53, the vacuum insulated container 1 is covered with the protective bag 53, and the influence of the heat bridge phenomenon occurring in the vacuum insulated container 1 can be reduced.
By closing the opening 52 and folding the folding portion 56 , it is possible to prevent air from entering the protective bag 53 through the opening 52 .

Note that this embodiment shows one mode in which the present invention is applied, and the present invention is not limited to the above embodiment.

As described above, the vacuum insulation material and vacuum insulation container of the present invention are formed into a bag shape by folding a sheet-like vacuum insulation material, and can be suitably used as an insulation bag that can be manufactured easily and at low manufacturing cost.

REFERENCE SIGNS LIST 1 vacuum insulation container 2 opening 6, 7 opposing surface portion 11 vacuum insulation material 12 outer covering material 13 core material 14 adsorbent 20 non-insulated portion 21, 22 non-insulated side portion 24, 25 non-insulated end portion 51 heat-retaining bag 53 protective bag 114 portion to be folded

Claims (8)

A method for producing a vacuum insulation material by vacuum sealing a core material with an outer covering material having gas barrier properties and folding the core material at a planned folding portion, comprising the steps of:
Adsorbents that absorb moisture and gas are placed inside the insulation material.
A method for producing vacuum insulation material, wherein the intended folding portion is provided at a position that does not overlap with the position where the adsorbent is arranged, and along the boundary between the position where the adsorbent is arranged and a position where the adsorbent is not arranged in the core material. The method for producing a vacuum insulation material according to claim 1 , wherein the core material has a slit into which the adsorbent is fitted. A method for producing a vacuum insulated container, comprising the steps of: forming a vacuum insulation material by vacuum sealing a core material with an outer covering material having gas barrier properties; folding the vacuum insulation material at a portion to be folded to form a bag body;
An adsorbent that adsorbs moisture and gas is placed inside the vacuum insulation material,
A method for producing a vacuum insulated container, wherein the intended bending portion is located at a position that does not overlap with a position where the adsorbent is arranged, and the intended bending portion is provided along a boundary between a position where the adsorbent is arranged and a position where the adsorbent is not arranged in the core material. The bag body is configured such that the vacuum insulation material is folded in half by folding processing at the intended folding portion to form a pair of opposing surface portions,
4. A method for producing a vacuum insulated container as described in claim 3, wherein an adsorbent is provided on at least one of the opposing surfaces, and when cargo is inserted between the opposing surfaces, the opposing surfaces are folded in a tortoiseshell shape so that the adsorbent portion becomes the folding starting point and protrudes outward. The bag body is configured such that the vacuum insulation material is folded in half by folding processing at the intended folding portion to form a pair of opposing surface portions,
4. The method for producing a vacuum insulated container as described in claim 3, wherein an adsorbent is provided on at least one of the opposing surfaces, and when cargo is inserted between the opposing surfaces, the opposing surfaces are folded into a box shape with the adsorbent portion serving as the folding starting point and projecting outward. The method for producing a vacuum insulated container according to claim 3 , wherein the core material has a slit into which the adsorbent is fitted. 7. A method for producing a vacuum insulated container as described in any one of claims 3 to 6, wherein the outer covering material has a foil film layer on its front surface and a vapor deposition film layer on its back surface, and is folded so that the foil film layer is on the outside and the vapor deposition film layer is on the inside. a protective bag formed of polyethylene or polyurethane and an aluminum layer;
A method for producing a thermal insulation bag comprising a vacuum insulated container produced by the method for producing a vacuum insulated container according to any one of claims 3 to 7,
The vacuum insulation container is stored inside the protective bag.
How to produce thermal insulation bags.

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