JP7604009B2 - Adsorption member, its manufacturing method and vacuum insulation material - Google Patents

Description

The present invention relates to an adsorption member, a manufacturing method thereof, and a vacuum insulation material equipped with the adsorption member.

Vacuum insulation materials are widely used in buildings, vending machines, cooler boxes, etc. Vacuum insulation materials are formed by placing a core material inside a bag that has gas barrier properties. The air is exhausted from the area where the core material is placed, and the bag is sealed after the area is made into a near-vacuum state, allowing the vacuum insulation material to exhibit high insulating performance.

Moisture remaining in the bag after sealing can lead to a decrease in the insulating performance of the vacuum insulation material. In response to this, Patent Documents 1 and 2 disclose vacuum insulation materials equipped with an adsorbent that adsorbs moisture. The adsorbent is packaged in a packaging material and is contained in the bag together with the core material.

JP 2015-178853 A JP 2021-088411 A

In Patent Document 1, breathable paper or nonwoven fabric is proposed as a packaging material for packaging the adsorbent. Therefore, when a highly active adsorbent (i.e., an adsorbent with a high moisture adsorption rate) is used, the adsorbent may adsorb moisture in the air through the packaging material before being contained in the bag. As a result, the activity of the adsorbent is lost, and the adsorbent cannot exert its moisture adsorption performance after being contained in the bag, which may lead to a decrease in the insulation performance of the vacuum insulation material.
Furthermore, when calcium oxide, zeolite, or the like is used as an adsorbent, the adsorbent can be reused by heating and removing water from the adsorbent recovered from used vacuum insulation materials, etc. However, the paper, nonwoven fabric, porous plastic film, and the like used as packaging materials in the invention described in Patent Document 1 are not suitable for heating, and there is a risk that the effort required for reuse will increase.

Meanwhile, in Patent Document 2, a thin film made of a metal material is used as a packaging material for packaging the adsorbent, making it possible to use the adsorbent in a highly active state in the vacuum insulation material while also making the adsorption member easy to reuse. However, there was an issue that the film itself was hard due to the residual stress generated when rolling the metal material, and several pinholes were created on the fold lines when the film was folded, and these pinholes caused a deterioration in the adsorption performance of the adsorbent after packaging.

The present invention aims to provide an adsorption member, a manufacturing method thereof, and a vacuum insulation material that reduce the occurrence of pinholes in the packaging material during the manufacturing process and suppress deterioration of the adsorption performance of the adsorbent after packaging.

After extensive research, the inventors discovered that the above problems could be solved by forming the packaging material from an annealed aluminum sheet, and thus completed the present invention.

That is, the present invention is as follows .
[1 ]
A method for manufacturing an adsorption member,
(a) using an atmospheric electric furnace, annealing an aluminum sheet at 100 to 600° C. for 1 to 3 hours under atmospheric pressure with ON/OFF control or PID control, and then cooling the aluminum sheet to room temperature by natural cooling in the atmospheric electric furnace, or removing the aluminum sheet from the atmospheric electric furnace and natural cooling to room temperature; or (b) using a vacuum heating furnace, annealing an aluminum sheet at 100 to 600° C. for 1 to 3 hours under vacuum with PID control, and then cooling the aluminum sheet to room temperature by vacuum cooling in the vacuum heating furnace ;
The adsorption member is
A moisture absorbent;
a one-layer or multiple-layer sheet-like packaging material, which is folded to form an adsorbent-accommodating space for accommodating the moisture adsorbent, and an air passage extending from the adsorbent-accommodating space to an outside of the packaging material while bending;
The packaging material is formed from annealed aluminum sheets.
A manufacturing method comprising:
［ 2 ］
The manufacturing method according to [ 1 ], comprising the step (b), wherein the operating pressure in the annealing treatment and the cooling is 1000 Pa or less.
[3]
The aluminum sheet contains 98.0% by mass or more of Al, 0.7% by mass or less of Si, 0.7% by mass or less of Fe, 0.1% by mass or less of Cu, 0.05% by mass or less of Mn, 0.05% by mass or less of Mg, and 0.05% by mass or less of Zn.
[4]
The manufacturing method according to any one of [1] to [3], wherein the packaging material is a single-layer packaging material formed from a single aluminum sheet, or a multi-layer packaging material formed from multiple overlapping aluminum sheets.
[5]
The manufacturing method according to any one of [1] to [4], wherein the annealed aluminum sheet has a thickness of 8 to 40 μm.
［ ６ ］
A method for producing a vacuum insulation material, comprising: sealing an adsorption member produced by the method according to any one of [1] to [ 5 ] and a core material in a bag .

The present invention provides an adsorption member, a manufacturing method thereof, and a vacuum insulation material that reduce the occurrence of pinholes in the packaging material during the manufacturing process and suppresses deterioration of the adsorption performance of the adsorbent after packaging.

1 is a perspective view showing an example of a vacuum insulation material of the present embodiment. 2 is a cross-sectional view showing the II-II cross section of FIG. 1. FIG. 2 is a plan view showing the attraction member of the first embodiment. FIG. 4 is a cross-sectional view showing the IV-IV section of FIG. 5A to 5C are explanatory diagrams illustrating a manufacturing process of the adsorption member according to the first embodiment. FIG. 11 is a perspective view showing an adsorption member according to a second embodiment. 10A to 10C are explanatory diagrams showing a manufacturing process of the adsorption member of the second embodiment. 13A to 13C are explanatory diagrams showing a manufacturing process of the adsorption member of the third embodiment. 13A to 13C are explanatory diagrams showing a manufacturing process of the adsorption member of the fourth embodiment. 13A to 13C are explanatory diagrams showing a manufacturing process of the adsorption member of the fifth embodiment. 13A to 13C are explanatory diagrams showing a manufacturing process of the adsorption member of the sixth embodiment. 13A to 13C are explanatory diagrams showing a manufacturing process of the adsorption member of the seventh embodiment.

Hereinafter, an embodiment of the present invention (hereinafter, simply referred to as the present embodiment) will be described in detail. The present invention is not limited to the following embodiment, and various modifications can be made within the scope of the present invention.
In this specification, "approximately ___ shape" includes not only an exact ___ shape, but also a shape that can be understood to be approximately ___ shape.

<Adsorption member>
The adsorption member of this embodiment includes a moisture adsorbent and a packaging material.
The shape of the adsorbent member (the final shape of the packaging material after folding) is not particularly limited, but may be, for example, a roughly square shape measuring 40 to 60 mm in length and 40 to 60 mm in width in a plan view.

[Packaging materials]
The packaging material constituting the adsorbent member of this embodiment is in the form of a single or multiple layer sheet, which is folded to form an adsorbent storage space for storing a moisture adsorbent and an air passage that extends in a curved manner from the adsorbent storage space to the outside of the packaging material, and is made of an annealed aluminum sheet.
According to this configuration, the moisture adsorbent is contained in a packaging material formed of an aluminum sheet, so that adsorption of moisture through the packaging material is suppressed. In addition, the moisture adsorbent can adsorb moisture from the outside of the packaging material through the air passage, but the air passage extends while bending. Therefore, by adjusting the degree of bending of the air passage, it is possible to adjust the adsorption of moisture through the air passage. As a result, it becomes possible to use the moisture adsorbent in a highly active state in the vacuum insulation material.

In addition, because the packaging material is made of an annealed aluminum sheet, it is easier to fold compared to packaging material made of a non-annealed aluminum sheet, and pinholes that occur on the fold lines when folding can be reduced, improving the barrier performance of the packaging material. This also slows down the rate at which the adsorption performance of the moisture adsorbent contained in the packaging material deteriorates, making it possible to suppress deterioration of the adsorbent's adsorption performance after packaging.

In addition, because aluminum sheets have high heat resistance, when removing the moisture adsorbent, the moisture adsorbent can be heated while still contained in the packaging material. This means that the adsorption member can be easily reused.

The packaging material may be a single-layer packaging material formed from one aluminum sheet, or a multi-layer packaging material formed from multiple overlapping aluminum sheets. In the case of a multi-layer packaging material formed from multiple overlapping aluminum sheets, the number of aluminum sheets (number of layers of the packaging material) may be appropriately set according to the total thickness of the desired annealed aluminum sheets, but is preferably 2 to 5 sheets (2 to 5 layers), and more preferably 2 to 3 sheets (2 to 3 layers). When the number of aluminum sheets is within the above range, the annealed aluminum sheets can be easily folded, pinholes on the fold lines during folding can be effectively reduced, and the barrier performance of the packaging material tends to be improved. This also slows down the rate of deterioration of the adsorption performance of the moisture adsorbent contained in the packaging material, and tends to effectively suppress deterioration of the adsorption performance of the moisture adsorbent after packaging.

The number of times the packaging material is folded is not particularly limited as long as an adsorbent storage space that stores the moisture adsorbent and an air passage that extends while bending from the adsorbent storage space to the outside of the packaging material are formed, and the number of folds may be any number, but 3 to 6 times is preferable. If the number of folds of the packaging material is within the above range, it is possible to effectively reduce the occurrence of pinholes on the fold lines when folding, and there is a tendency to effectively suppress deterioration of the adsorbent's adsorption performance after packaging.

[Annealed aluminum sheet]
The annealed aluminum sheet constituting the packaging material is not particularly limited, and examples thereof include an aluminum sheet such as aluminum foil that is annealed in sheet form as in the first embodiment described later, and an aluminum sheet that is formed into a cup shape or the like and then annealed as in the third embodiment described later.
The sheet shape may be, for example, a substantially square shape with a length of 100 to 150 mm and a width of 100 to 150 mm, etc. The cup shape may be, for example, a substantially circular shape with a diameter of 100 to 130 mm or a substantially rectangular shape with a length of 100 to 150 mm and a width of 100 to 150 mm, etc., formed into a cup shape by folding an aluminum sheet.

The thickness of the annealed aluminum sheet is preferably 8 to 40 μm, and more preferably 11 to 20 μm. When the thickness of the annealed aluminum sheet is within the above range, the annealed aluminum sheet can be easily folded, the occurrence of pinholes on the fold lines during folding can be effectively reduced, and the barrier performance of the packaging material tends to be improved. This also tends to slow down the rate of deterioration of the adsorption performance of the moisture adsorbent contained in the packaging material, and effectively suppress deterioration of the adsorption performance of the moisture adsorbent after packaging.

The aluminum sheet to be annealed preferably contains 98.0% by mass or more of Al, 0.7% by mass or less of Si, 0.7% by mass or less of Fe, 0.1% by mass or less of Cu, 0.05% by mass or less of Mn, 0.05% by mass or less of Mg, and 0.05% by mass or less of Zn.
The Al content in the aluminum sheet is more preferably 90% by mass or more, and further preferably 99.3% by mass or more.
The composition of the aluminum sheet (the content of each metal contained in the aluminum sheet) may be measured using a conventionally known component analysis method. For example, inductively coupled plasma mass spectrometry (ICP-MS), inductively coupled plasma optical emission spectrometry (ICP-OES), X-ray fluorescence spectrometry (XRF), etc. can be used.

[Moisture absorbent]
The moisture adsorbent is not particularly limited as long as it is a substance that adsorbs moisture (water vapor), and examples thereof include calcium oxide, calcium chloride, magnesium oxide, zeolite (crystalline aluminosilicate), non-crystalline aluminosilicate, MOF (metal organic framework), silica gel, activated carbon, barium oxide, cobalt oxide, barium-lithium alloy, Cu-ZSM5 zeolite, and mixtures thereof. From the viewpoints of moisture adsorption performance and productivity, and ease of heating and reuse, the moisture adsorbent is preferably calcium oxide or zeolite.
The moisture adsorbent may be of one type alone or a combination of multiple types.

The shape of the moisture adsorbent is not particularly limited, and examples include shapes that do not have a fixed form such as powder or granules, and shapes of powdered moisture adsorbents that have been molded.

In the adsorption member of this embodiment, the moisture adsorbent is preferably disposed on the packaging material, and the adsorbent accommodation space is formed by valley-folding the packaging material along a plurality of lines.
According to this configuration, the adsorbent storage space and the ventilation passage can be easily formed by using the sheet-like packaging material.

In the adsorbent member of this embodiment, preferably, the packaging material before being folded in a valley shape has a bottom and a peripheral side portion extending upward from the periphery of the bottom, and an adsorbent placement area in which a moisture adsorbent is placed is provided on the upper surface of the bottom, and the peripheral side portion covers the periphery of the adsorbent placement area.
According to this configuration, the movement of the moisture adsorbent arranged in the adsorbent arrangement area on the upper surface of the bottom part is restricted by the peripheral side part, so that the packaging material can be folded in a valley shape while the moisture adsorbent is stably arranged in the adsorbent arrangement area without spilling.

In the adsorption member of this embodiment, preferably, the packaging material has a first packaging material and a second packaging material, and the first packaging material is folded to form a core having an adsorbent accommodating space and a first air passage that extends while bending from the adsorbent accommodating space to the outside of the first packaging material, and the second packaging material is folded to form a core accommodating space that accommodates the core, and a second air passage that extends while bending from the core accommodating space to the outside of the second packaging material.
According to this configuration, the ventilation path extending from the adsorbent storage space to the outside of the packaging material is lengthened by providing the second packaging material, making it possible to adjust the adsorption of moisture through the ventilation path.

In the adsorption member of the present embodiment, the multiple lines preferably intersect with each other.
According to this configuration, the ventilation path can be formed so that it is bent even at its end, which increases the degree of freedom in adjusting the degree of bending, and makes it possible to adjust the adsorption of moisture through the ventilation path.

In the adsorption member of this embodiment, the adsorbent storage space is preferably formed by valley folding the packaging material along a first pair of lines that face each other and a second pair of lines that face each other and intersect with the first pair of lines.
According to this configuration, the packaging material is folded along the four lines surrounding the adsorbent-containing space, so that there is no gap extending from the adsorbent-containing space to the outside of the packaging material without bending, and it is possible to adjust the amount of moisture adsorption through the ventilation path so as to be limited.

In the adsorption member of this embodiment, preferably, the packaging material has a bag-shaped portion with an opening formed at one end, and the packaging material is further folded inwardly from the opening of the bag-shaped portion to form an adsorbent storage space within the bag-shaped portion.
According to this configuration, since an adsorbent storage space is formed in the bag-shaped portion, the movement of the moisture adsorbent stored in the adsorbent storage space is restricted within the bag-shaped portion, and as a result, it is possible to fold the packaging material while keeping the moisture adsorbent stably disposed within the bag-shaped portion without spilling it.

<Method of manufacturing the adsorption member>
The method for producing the adsorption member of the present embodiment is not particularly limited, but preferably includes, for example, the following step (a) or step (b).
(a) A process in which an aluminum sheet is annealed at 100 to 600° C. for 1 to 3 hours under atmospheric pressure with ON/OFF control or PID control using an atmospheric electric furnace, and then cooled to room temperature by natural cooling in the atmospheric electric furnace, or the aluminum sheet is removed from the atmospheric electric furnace and naturally cooled to room temperature.
(b) A process of annealing the aluminum sheet in a vacuum at 100 to 600° C. for 1 to 3 hours under PID control using a vacuum heating furnace, and then cooling the aluminum sheet to room temperature in the vacuum heating furnace.

In the step (a) carried out under atmospheric pressure, the annealing temperature is preferably 100 to 600°C, more preferably 200 to 600°C, even more preferably 250 to 500°C, and even more preferably 300 to 500°C.
When the annealing temperature is within the above range, the aluminum sheet becomes easy to fold, the occurrence of pinholes on the fold lines when folding can be effectively reduced, and the barrier performance of the packaging material tends to be improved. This also tends to slow down the rate of deterioration of the adsorption performance of the moisture adsorbent contained in the packaging material, making it possible to effectively suppress deterioration of the adsorption performance of the moisture adsorbent after packaging.

In step (a), the annealing time is preferably 1 to 3 hours. When the annealing time is within this range, the sheet tends to have a certain strength that makes it easy to use as a packaging material, and also has flexibility to reduce the occurrence of pinholes.

In the step (b) carried out under vacuum, the annealing temperature is preferably 100 to 600°C, more preferably 200 to 600°C, and further preferably 300 to 500°C.
When the annealing temperature is within the above range, the annealed aluminum sheet can be easily folded, pinholes occurring on the fold lines during folding can be reduced, and the barrier performance of the packaging material tends to be improved. This also tends to slow down the rate of deterioration of the adsorption performance of the moisture adsorbent contained in the packaging material, making it possible to effectively suppress deterioration of the adsorption performance of the moisture adsorbent after packaging.

In step (b), the annealing time is preferably 1 to 3 hours, and more preferably 1 to 2 hours. When the annealing time is within the above range, the sheet tends to have a certain strength that makes it easy to use as a packaging material, and also has flexibility to reduce the occurrence of pinholes.

In step (b), the operating pressure in the annealing and cooling is preferably 1000 Pa or less. When the operating pressure is within the above range, the sheet tends to have a certain strength that makes it easy to package as a packaging material, and the surface oxidation reaction is less likely to occur during the annealing treatment under vacuum. The sheet also tends to have flexibility to reduce the occurrence of pinholes.

The configuration of the adsorption member of this embodiment will be described below with reference to the drawings, taking the first to seventh embodiments as specific examples. To make the description easier to understand, the same components in each drawing will be given the same reference numerals as much as possible, and duplicate descriptions will be omitted.

First Embodiment
The adsorption member 4A according to the first embodiment will be described with reference to Fig. 3 to Fig. 5. Fig. 3 is a plan view showing the adsorption member 4A, and Fig. 4 is a cross-sectional view showing the cross section taken along line IV-IV in Fig. 3. Fig. 5 is an explanatory diagram showing a manufacturing process of the adsorption member 4A.

The adsorption member 4A includes a moisture adsorbent 41 and a packaging material 42 .
The moisture adsorbent 41 is in a powder or granular form and does not have a fixed shape.
The packaging material 42 is in the form of a sheet, and has main surfaces 420a and 420b as described later (see FIG. 5). Specifically, the packaging material 42 is a substantially square sheet (one layer) of annealed aluminum foil, with a thickness of 12 μm and a side dimension of 150 mm. The packaging material 42 also has a high gas barrier property compared to paper, nonwoven fabric, etc. In other words, the packaging material 42 has a property of being less permeable to air and water vapor than paper, nonwoven fabric, etc. As described later, in order to make the packaging material 42 easily foldable without causing damage or pinholes, etc., it is preferable that the thickness of the packaging material 42 is 25 μm or less.

As shown in FIG. 4, the packaging material 42 is folded to form an adsorbent storage space 43 therein. In addition, a small gap, an air passage 45, is formed between the folded portions of the packaging material 42. The air passage 45 extends while bending from the adsorbent storage space 43 to the outside of the packaging material 42. In other words, the adsorbent storage space 43 is in communication with the outside of the packaging material 42 via the air passage 45. The adsorbent 41 is stored in the adsorbent storage space 43.

When manufacturing the adsorbent member 4A, first, as shown in FIG. 5(A), the adsorbent 41 is placed in the adsorbent placement area 421 of the packaging material 42. The adsorbent placement area 421 is a virtual area having a substantially square shape located in the center of one of the main surfaces 420a of the packaging material 42.

Next, the packaging material 42 is valley-folded along the imaginary lines V11 and V12. The imaginary lines V11 and V12 are an example of the above-mentioned "first pair of lines," and are straight lines that face each other and extend substantially parallel to each other. The imaginary line V11 is located closer to the side 42a than the adsorbent placement area 421, and the imaginary line V12 is located closer to the side 42b than the adsorbent placement area 421.

In detail, first, the packaging material 42 is valley-folded along the imaginary line V11 as shown by the arrow F11. As a result, the adsorbent placement area 421 is covered by the portion of the packaging material 42 closer to the side 42a. Then, the packaging material 42 is valley-folded along the imaginary line V12 as shown by the arrow F12. Figure 5(B) shows the packaging material 42 that has been valley-folded along the imaginary lines V11 and V12.

Next, the packaging material 42 is valley-folded along the imaginary lines V13 and V14. The imaginary lines V13 and V14 are an example of the "second pair of imaginary lines" described above, and are straight lines that face each other and extend substantially parallel to each other. The imaginary lines V13 and V14 also intersect with the imaginary lines V11 and V12. The imaginary line V13 is located closer to the side 42c than the adsorbent placement area 421, and the imaginary line V14 is located closer to the side 42d than the adsorbent placement area 421.

In detail, first, the packaging material 42 is valley-folded along the imaginary line V13 as shown by the arrow F13. Then, the packaging material 42 is valley-folded along the imaginary line V14 as shown by the arrow F14.

As a result, as shown in FIG. 3, the adsorption member 4A is formed to have a substantially square shape in plan view. In other words, the adsorption member 4A is formed by folding the packaging material 42 in four valley folds and then stacking them.

Second Embodiment
The adsorption member 4B of the second embodiment will be described with reference to Fig. 6 and Fig. 7. Fig. 6 is a perspective view showing the adsorption member 4B, and Fig. 7 is an explanatory diagram showing a manufacturing process of the adsorption member 4B. Descriptions of parts of the configuration of the adsorption member 4B that are common to the configuration of the adsorption member 4A of the first embodiment will be omitted as appropriate.

The packaging material 42 used for the adsorption member 4B is also made of one sheet (one layer) of annealed aluminum foil, similar to the packaging material 42 used for the adsorption member 4A in the first embodiment.

When manufacturing the adsorption member 4B, first, as shown in FIG. 7(A), the moisture adsorbent 41 is placed in the adsorbent placement area 422 of the packaging material 42. The adsorbent placement area 421 is a virtual area of a roughly triangular shape located in the center of one of the main surfaces 420a of the packaging material 42.

Next, the packaging material 42 is valley-folded along the imaginary line V21 as shown by the arrow F21. The imaginary line V21 is a straight line and is positioned along one side of the adsorbent placement area 421. FIG. 7(B) shows the packaging material 42 that has been valley-folded along the imaginary line V21.

Next, the packaging material 42 is valley-folded along the imaginary line V22, as shown by the arrow F22. The imaginary line V22 is a straight line and is positioned along the other side of the adsorbent placement area 421. The imaginary line V22 also intersects with the imaginary line V21. Figure 7(C) shows the packaging material 42 that has been valley-folded along the imaginary line V22.

Next, the packaging material 42 is folded in a valley shape along the imaginary line V23, as shown by the arrow F23. The imaginary line V23 is a straight line and is positioned along yet another side of the adsorbent placement area 421. The imaginary line V23 also intersects with the imaginary lines V21 and V22.

As a result, as shown in FIG. 6, the adsorption member 4B is formed, which has a polygonal shape in plan view. That is, the adsorption member 4B is formed by folding the packaging material 42 three times. Inside the packaging material 42, an adsorbent storage space (not shown) and an air passage (not shown) that extends from the adsorbent storage space to the outside of the packaging material 42 while bending are formed.

Third embodiment
The adsorption member 4C according to the third embodiment will be described with reference to Fig. 8. Fig. 8 is an explanatory diagram showing a manufacturing process of the adsorption member 4C. Descriptions of parts of the configuration of the adsorption member 4C that are common to the configuration of the adsorption member 4A according to the first embodiment will be omitted as appropriate.

The packaging material 44 used in the adsorption member 4C is cup-shaped. In detail, the packaging material 44 is a cup-shaped aluminum foil formed by folding a sheet (one layer) of aluminum foil into a substantially circular shape and then annealing the aluminum foil. The packaging material 44 has a bottom portion 44a that is substantially circular in plan view, and a peripheral side portion 44b that extends upward from the periphery of the bottom portion 44a.

When manufacturing the adsorption member 4C, first, as shown in FIG. 8(A), the moisture adsorbent 41 is placed in the adsorbent placement area 441 of the packaging material 44. The adsorbent placement area 441 is a virtual area of a substantially circular shape located on the upper surface of the bottom portion 44a. The peripheral side portion 44b covers the periphery of this adsorbent placement area 441, so the movement of the moisture adsorbent 41 placed in the adsorbent placement area 441 is restricted by the peripheral side portion 44b.

Next, the packaging material 44 is valley-folded along the imaginary line V31 as shown by the arrow F31, and further valley-folded along the imaginary line V32 as shown by the arrow F32. Both imaginary lines V31 and V32 are straight lines and are located on one side and the other side of the adsorbent placement area 443. Figure 8 (B) shows the packaging material 44 that has been valley-folded along the imaginary lines V31 and V32.

Next, the packaging material 44 is valley-folded along the imaginary line V33 as shown by the arrow F33, and then valley-folded along the imaginary line V34 as shown by the arrow F34. Both imaginary lines V33 and V34 are straight lines and intersect with the imaginary lines V31 and V32.

This results in an adsorption member 4C (see FIG. 10) that is roughly square in plan view. That is, the adsorption member 4C is formed by folding the packaging material 44 four times. Inside the packaging material 44, an adsorbent storage space (not shown) and an air passage (not shown) that extends from the adsorbent storage space to the outside of the packaging material 44 while bending are formed.

Fourth embodiment
The adsorption member 4D of the fourth embodiment will be described with reference to Fig. 9. Fig. 9 is an explanatory diagram showing a manufacturing process of the adsorption member 4C. Descriptions of parts of the configuration of the adsorption member 4D that are common to the configuration of the adsorption member 4A of the first embodiment will be omitted as appropriate.

The packaging material 46 used in the adsorption member 4D is also cup-shaped. In detail, the packaging material 46 is a cup-shaped aluminum foil formed by folding a sheet (layer) of aluminum foil into a substantially rectangular shape and then annealing the aluminum foil. The packaging material 46 has a bottom portion 46a that is substantially rectangular in plan view, and a peripheral portion 46b that extends upward from the periphery of the bottom portion 46a.

When manufacturing the adsorption member 4D, first, as shown in FIG. 9(A), the moisture adsorbent 41 is placed in the adsorbent placement area 461 of the packaging material 46. The adsorbent placement area 461 is a virtual area of a substantially rectangular shape located on the upper surface of the bottom portion 46a. The peripheral side portion 46b covers the periphery of this adsorbent placement area 461, so the movement of the moisture adsorbent 41 placed in the adsorbent placement area 461 is restricted by the peripheral side portion 46b.

Next, the packaging material 46 is valley-folded along the imaginary line V41 as shown by the arrow F41, and further valley-folded along the imaginary line V42 as shown by the arrow F42. Both imaginary lines V41 and V42 are straight lines and are located on one side and the other side of the adsorbent placement area 461. Figure 9 (B) shows the packaging material 46 that has been valley-folded along the imaginary lines V41 and V42.

Next, the packaging material 46 is valley-folded along the imaginary line V43 as shown by the arrow F43, and then valley-folded along the imaginary line V44 as shown by the arrow F44. Both imaginary lines V43 and V44 are straight lines and intersect with the imaginary lines V41 and V42.

This results in an adsorption member 4D (see FIG. 11) that is roughly square in plan view. That is, the adsorption member 4C is formed by folding the packaging material 46 four times. Inside the packaging material 46, an adsorbent storage space (not shown) and an air passage (not shown) that extends from the adsorbent storage space to the outside of the packaging material 46 while bending are formed.

Fifth embodiment
The adsorption member 4E of the fifth embodiment will be described with reference to Fig. 10. Fig. 10 is an explanatory diagram showing a manufacturing process of the adsorption member 4E. Descriptions of parts of the configuration of the adsorption member 4E that are common to the configuration of the adsorption member 4A of the first embodiment will be omitted as appropriate.

The packaging material used in the adsorption member 4E includes packaging material 44I and packaging material 44II. Packaging material 44I is an example of the above-mentioned "first packaging material," and packaging material 44II is an example of the above-mentioned "second packaging material," both of which are the same as packaging material 44 in the third embodiment described above.

The adsorption member 4E is manufactured by packaging the adsorption member 4C of the third embodiment in the packaging material 44II. In other words, the adsorption member 4E is manufactured by doubly packaging the moisture adsorbent 41 using two sheets of packaging material 44. In detail, the adsorption member 4C of the third embodiment is first manufactured using the packaging material 44I. In the following description, the adsorption member 4C is referred to as the "core 4C". The air passage (not shown) that extends while bending from the adsorbent storage space (not shown) inside the core 4C to the outside of the packaging material 44I is an example of the above-mentioned "first air passage".

Next, as shown in FIG. 10(A), the core 4C is placed in the core placement area 442 of the packaging material 44II. The core placement area 442 is a virtual area of a substantially circular shape located on the upper surface of the bottom portion 44a. Because the peripheral side portion 44b covers the periphery of this core placement area 442, the movement of the core 4C placed in the core placement area 442 is restricted by the peripheral side portion 44b.

Next, the packaging material 44II is valley-folded along the imaginary line V51 as shown by the arrow F51, and further valley-folded along the imaginary line V52 as shown by the arrow F52. Both imaginary lines V51 and V52 are straight lines and are located on one side and the other side of the core placement area 442. FIG. 10(B) shows the packaging material 44II valley-folded along the imaginary lines V51 and V52.

Next, the packaging material 44II is valley-folded along the imaginary line V53 as shown by the arrow F53, and then valley-folded along the imaginary line V54 as shown by the arrow F54. Both imaginary lines V53 and V54 are straight lines and intersect with the imaginary lines V51 and V52.

This results in the formation of the suction member 4E, which is roughly square in plan view. That is, the suction member 4E is formed by folding the packaging materials 44I and 44II four times each. Inside the packaging material 44II, there is formed a core storage space (not shown) that stores the core 4C, and an air passage (not shown) that extends from the core storage space to the outside of the packaging material 44II. The air passage is an example of the "second air passage" described above.

The adsorbent storage space of the adsorbent member 4E is connected to the outside of the packaging material 44II via an air passage (first air passage) that extends while bending from the adsorbent storage space to the core storage space, and an air passage (second air passage) that extends while bending from the core storage space to the outside of the packaging material 44II. As a result, the moisture adsorbent 41 (see FIG. 8(A)) adsorbs moisture from the outside of the packaging material 44II via both air passages.

Sixth embodiment
The adsorption member 4F of the sixth embodiment will be described with reference to Fig. 11. Fig. 11 is an explanatory diagram showing a manufacturing process of the adsorption member 4F. Among the configuration of the adsorption member 4F, the description of the parts common to the configuration of the adsorption member 4A of the first embodiment will be omitted as appropriate.

The packaging material used in the adsorption member 4F includes packaging material 46I and packaging material 46II. Packaging material 46I is an example of the above-mentioned "first packaging material," and packaging material 46II is an example of the above-mentioned "second packaging material," both of which are the same as packaging material 46 of the fourth embodiment described above.

The adsorption member 4F is manufactured by packaging the adsorption member 4D of the fourth embodiment in the packaging material 46II. In other words, the adsorption member 4F is manufactured by doubly packaging the moisture adsorbent 41 using two sheets of packaging material 46. In detail, the adsorption member 4D of the fourth embodiment is first manufactured using the packaging material 46I. In the following description, the adsorption member 4D is referred to as the "core 4D". The air passage (not shown) that extends while bending from the adsorbent storage space (not shown) inside the core 4D to the outside of the packaging material 46I is an example of the above-mentioned "first air passage".

Next, as shown in FIG. 11(A), the core 4D is placed in the core placement area 462 of the packaging material 46II. The core placement area 462 is a virtual area of a substantially rectangular shape located on the upper surface of the bottom portion 46a. Because the peripheral side portion 46b covers the periphery of this core placement area 462, the movement of the core 4D placed in the core placement area 462 is restricted by the peripheral side portion 46b.

Next, the packaging material 46II is valley-folded along the imaginary line V61 as shown by the arrow F61, and further valley-folded along the imaginary line V62 as shown by the arrow F62. Both imaginary lines V61 and V62 are straight lines and are located on one side and the other side of the core placement area 462. Figure 11 (B) shows the packaging material 44II that has been valley-folded along the imaginary lines V61 and V62.

Next, the packaging material 46II is valley-folded along the imaginary line V63 as shown by the arrow F63, and then valley-folded along the imaginary line V64 as shown by the arrow F64. Both imaginary lines V63 and V64 are straight lines and intersect with the imaginary lines V61 and V62.

This results in the formation of the suction member 4F, which is roughly square in plan view. That is, the suction member 4F is formed by folding the packaging materials 46I and 46II four times each. Inside the packaging material 46II, there is formed a core storage space (not shown) that stores the core 4D, and an air passage (not shown) that extends from the core storage space to the outside of the packaging material 46II. This air passage is an example of the "second air passage" described above.

The adsorbent storage space of the adsorbent member 4F is connected to the outside of the packaging material 46II via an air passage (first air passage) that extends while bending from the adsorbent storage space to the core storage space, and an air passage (second air passage) that extends while bending from the core storage space to the outside of the packaging material 46II. As a result, the moisture adsorbent 41 (see FIG. 9(A)) adsorbs moisture from the outside of the packaging material 46II via both air passages.

Seventh embodiment
The seventh embodiment of the adsorption member 4G will be described with reference to Fig. 12. Fig. 12 is an explanatory diagram showing a manufacturing process of the adsorption member 4G. Descriptions of parts of the configuration of the adsorption member 4G that are common to the configuration of the adsorption member 4A of the first embodiment will be omitted as appropriate.

The packaging material 49 used in the adsorption member 4G of the seventh embodiment has a bag shape. In detail, the packaging material 49 is formed by stacking a first packaging material portion 49I, which has a substantially rectangular shape in a plan view and is made of one sheet (one layer) of annealed aluminum foil, and a second packaging material portion 49II, which has a substantially rectangular shape in a plan view and is made of one sheet (one layer) of annealed aluminum foil, and providing fused portions 491 along three sides. As a result, the packaging material 49 has a bag-shaped portion 492 in which an opening 492a is formed. The bag-shaped portion 492 is in communication with the outside at the opening 492a.

When manufacturing the adsorption member 4G, first, the moisture adsorbent 41 is inserted into the bag-shaped portion 492 through the opening 492a. The movement of the moisture adsorbent 41 placed in the bag-shaped portion 492 is restricted by the fused portion 491.

Next, the packaging material 49 is valley-folded along imaginary lines V71, V72, and V73 in order as indicated by arrows F71, F72, and F73. The imaginary lines V71, V72, and V3 are all straight lines, and are positioned approximately parallel to each other, on the inside of the bag-shaped portion 492 relative to the opening 492a.

This results in an adsorption member 4G that is approximately square in plan view. That is, the adsorption member 4G is formed by folding the packaging material 49 three times. The packaging material 49 forms an adsorbent storage space 493 in the bag-shaped portion 492, and an air passage (not shown) that extends while bending from the adsorbent storage space 493 to the outside of the packaging material 49 (i.e., to the opening 492a).

<Vacuum insulation material>
The vacuum insulation material of the present embodiment includes the adsorption member of the present embodiment described above, a core material, and a bag that encloses the adsorption member and the core material.
According to the true vacuum insulation material of this embodiment, the adsorbent is used in a highly active state, making it possible to suppress deterioration of the insulation performance of the vacuum insulation material.
Hereinafter, the configuration of an example of a vacuum insulation material according to the present embodiment will be described with reference to the drawings. In order to facilitate understanding of the description, the same components in each drawing are denoted by the same reference numerals as much as possible, and duplicate descriptions will be omitted.

Figure 1 is a perspective view showing the vacuum insulation material 1, and Figure 2 is a cross-sectional view showing the II-II cross section of Figure 1. To make the explanation easier to understand, Figures 1 and 2 exaggerate the thickness of exterior films 21 and 22, which will be described later.

As shown in FIG. 1, the vacuum insulation material 1 has an overall generally flat plate shape. When viewed from above, the vacuum insulation material 1 has a generally rectangular shape and has a long side 1L and a short side 1S.

The vacuum insulation material 1 comprises a bag body 2, a core material 3, and an adsorption member 4.

[Adsorption member]
2, the adsorption member 4 of this embodiment is accommodated in the core accommodating space 27 of the bag body 2 together with the core 3. Specifically, the adsorption member 4 is embedded in the core 3. The adsorption member 4 can adopt various forms, such as the first to seventh embodiments described above.

[Bag body]
The bag body 2 has exterior films 21 and 22. The exterior films 21 and 22 are laminated sheets each having a protective film as the outermost layer, a gas barrier film as the intermediate layer, and a fusible film as the innermost layer.

The protective film is made of, for example, a polyolefin (polyethylene, polypropylene, polyethylene terephthalate) film, a polystyrene film, an acrylonitrile-styrene copolymer film, an acrylonitrile-butadiene-styrene film, a methacrylic film, a polycarbonate film, a polyvinyl alcohol film, an ethylene vinyl alcohol film, a nylon film, a polyamide resin film, or the like.
The thickness of the protective film is preferably 10 μm or more, since this can effectively prevent damage to the exterior films 21 and 22 .

The gas barrier film is composed of, for example, metal foil such as aluminum, stainless steel, or copper; evaporated film such as aluminum, (transparent) silica, or alumina; or resin film such as ethylene-vinyl alcohol copolymer or polyvinyl alcohol.
The thickness of the gas barrier film is preferably 10 μm or more, since this can effectively prevent damage to the exterior films 21 and 22 .

The fusible film is disposed in the innermost layer of the laminated sheet for the purpose of fusing together the exterior films 21, 22. Examples of the fusible film include films of low density polyethylene resin, high density polyethylene resin, polypropylene resin, ethylene-vinyl alcohol copolymer, ethylene-propylene copolymer, and methylpentene polymer.
The thickness of the fusible film is preferably 25 μm or more, since this can improve the sealing property of the fused portion where the fusible films are fused together and can prevent leakage from the fused portion after vacuum packaging.

The bag body 2 is arranged such that the exterior films 21 and 22 thus constructed are overlapped with the surfaces on which the fusible films are arranged facing each other. The exterior films 21 and 22 are partially fused within the plane.

In detail, the exterior film 21 and the exterior film 22 are fused at the long side fused portions 23a, 23b and the short side fused portions 25a, 25b. The long side fused portions 23a, 23b extend linearly along the long side 1L of the vacuum insulation material 1. The short side fused portions 25a, 25b extend linearly along the short side 1S of the vacuum insulation material 1 and are continuous with the ends of the long side fused portions 23a, 23b.

The exterior film 21 and the exterior film 22 are fused at the long side fused parts 23a, 23b and the short side fused parts 25a, 25b, so that a core material storage space 27 is formed inside the bag body 2 as shown in FIG. 2. The core material storage space 27 is surrounded by the long side fused parts 23b, 23b and the short side fused parts 25a, 25b, and is sealed by these fused parts, making it airtight.

[Core material]
The core material 3 has a flat shape and is accommodated in a core material accommodating space 27 of the bag body 2 .
The core material 3 is a member that provides the heat insulating performance of the vacuum insulation material 1, and is made of an inorganic fiber mat, a porous material, a powder molding, or the like. The inorganic fiber is a fiber made of an inorganic substance, and examples thereof include glass wool made of short fibers and glass fiber made of long fibers. Examples of the porous material include aerogel and urethane foam, and examples of the powder molding include silica particles and perlite. Specifically, glass wool and glass fiber, which are generally used as heat insulating and sound absorbing materials, can be preferably used.

When the core material 3 is an inorganic fiber mat, it may be a single layer body consisting of one inorganic fiber mat, or a laminate body consisting of two to four inorganic fiber mats laminated together.
The inorganic fiber mat may be provided with a thermosetting binder derived from an organic binder, an inorganic binder, or a mixture thereof. Such an inorganic fiber mat has a suitable rigidity and is not easily crushed, so that the core density and the thermal conductivity between the inorganic fibers are not easily increased. Therefore, such an inorganic fiber mat can maintain high heat insulation performance.

[Vacuum insulation material manufacturing process]
When manufacturing such a vacuum insulation material 1, first, the exterior film 21 and the exterior film 22 are overlapped, and the areas corresponding to the long side fusion parts 23a, 23b and the short side fusion part 25a are heated. When the fusible film melts by heating, the long side fusion parts 23a, 23b and the short side fusion part 25a are formed. At this time, the short side fusion part 25b has not yet been formed, so the core material storage space 27 is connected to the outside at one short side 1S.

Next, the core material 3 and the adsorption member 4 are inserted into the core material storage space 27 from the short side 1S. Then, using a vacuum packaging machine, air is exhausted from the core material storage space 27 containing the core material 3 and the adsorption member 4 through the short side 1S. This reduces the pressure inside the core material storage space 27 to about 1 to 2 Pa (medium vacuum state).

Next, the portions of the exterior films 21 and 22 that correspond to the short side fusion portion 25b described above are heated. When the fusible film melts by heating, the short side fusion portion 25b is formed. This seals the core material storage space 27, and the core material 3 and the adsorption member 4 are vacuum-packaged in the core material storage space 27. Thereafter, the inside of the vacuum packaging machine is opened to the atmosphere, creating a pressure difference between the inside and outside of the bag body 2, and the core material 3 is compressed by the exterior films 21 and 22, completing the vacuum insulation material 1.

The vacuum insulation material 1 manufactured in this manner exhibits high insulation performance and can be applied to buildings, vending machines, cooler boxes, etc. From the viewpoint of practicality, it is preferable that the thermal conductivity of the vacuum insulation material 1 is 2.5 mW/(m·K) or less.

In the manufacturing process described above, air may remain in the core material storage space 27. The moisture (i.e., water vapor) contained in this air acts as a heat transfer material in the core material storage space 27, which may lead to a decrease in the insulating performance of the vacuum insulation material 1. Therefore, the vacuum insulation material 1 suppresses the decrease in insulating performance by having the adsorption member 4 adsorb the moisture in the core material storage space 27.

The present invention will be described in more detail below with reference to examples. The present invention is not limited to the following examples as long as the gist of the invention is not exceeded.

The measurement methods used in the examples and comparative examples are as follows:

[Number of pinholes]
The packaging materials used in the examples and comparative examples were unfolded and spread out in a sheet shape. The packaging materials spread out in a sheet shape were irradiated with light using a parallel LED light source. The shadows of the packaging materials were observed using an electron microscope "SKL-Z200C LENS" manufactured by Saito Kogaku Co., Ltd., and the number of light portions (diameter 21 μm or more) that passed through the pinholes generated in the packaging materials were counted to measure the number of pinholes generated in the packaging materials. The number of tests N=4 was carried out, and the average value (rounded off to the first decimal place) was taken as the measurement result. In addition, in the case of a packaging material having multiple layers in which multiple aluminum sheets are stacked, the measurement was carried out for each sheet (layer), and the measurements were expressed in order from the outermost sheet as the first sheet (layer), the second sheet (layer), etc.

[Water adsorption amount]
The adsorption members obtained in the examples and comparative examples were placed in an environment with a temperature of 50° C. and a humidity of 70%, and the amount of moisture adsorbed (g) 24 hours after placement was calculated according to the following formula.
Moisture adsorption amount after 24 hours (g)=mass of adsorption member after 24 hours (g)−mass of adsorption member before installation (g)
The number of tests was N=4, and the average value was taken as the measurement result.

The raw materials used in the examples and comparative examples are as follows:

[Packaging materials]
Square aluminum foil (composition: Al 98.0% by mass or more, Si 0.7% by mass or less, Fe 0.7% by mass or less, Cu 0.1% by mass or less, Mn 0.05% by mass or less, Mg 0.05% by mass or less, Zn 0.05% by mass or less, length 150 mm x width 150 mm x thickness 12 μm)
Circular aluminum foil (composition: Al 98.0% by mass or more, Si 0.7% by mass or less, Fe 0.7% by mass or less, Cu 0.1% by mass or less, Mn 0.05% by mass or less, Mg 0.05% by mass or less, Zn 0.05% by mass or less, diameter 120 mm x thickness 20 μm)
・Square copper foil (150cm long x 150cm wide x 12μm thick)
・Circular copper foil (equivalent to 120 mm diameter x 12 μm thickness)

[Moisture absorbent]
Calcium oxide (CaO) (powder)
・Zeolite (powder form)

[Example 1]
An adsorption member was prepared as Example 1 by using calcium oxide (CaO) as a moisture adsorbent and a square piece of annealed aluminum foil as an aluminum sheet, following the procedure described in the first embodiment above.
The annealed square aluminum foil was obtained by annealing the aluminum foil at 300°C for 1 hour under atmospheric pressure with ON/OFF control using an atmospheric electric furnace, and then allowing it to cool naturally to room temperature in the atmospheric electric furnace.

[Examples 2 to 8]
An adsorption member was produced in the same manner as in Example 1, except that the annealing conditions for the aluminum sheet were changed as shown in Table 1.
The annealed square aluminum foils of Examples 5 to 8 were obtained by annealing the aluminum foils in a vacuum using a vacuum heating furnace under PID control at the temperatures and times shown in Table 1, and then cooling them to room temperature in the vacuum heating furnace. The operating pressure in the annealing and cooling was 1000 Pa or less.
The measurement results of each physical property are shown in Table 1.

[Example 9]
An annealed square aluminum foil was used as the aluminum sheet, and an adsorption member was produced in the same manner as in the second embodiment, as Example 9.
The annealing treatment was carried out under atmospheric pressure as in Example 1.
The measurement results of each physical property are shown in Table 1.

[Examples 10 and 11]
An adsorption member was prepared in the same manner as in Example 1, except that the aluminum sheets were stacked in the number shown in Table 1.
The measurement results of each physical property are shown in Table 1.

[Example 12]
An adsorbent member was prepared in the same manner as in Example 1, except that zeolite was used as the moisture adsorbent.
The measurement results of each physical property are shown in Table 1.

[Example 13]
As the aluminum sheet, a circular piece of aluminum foil was cut into a cup shape and annealed. An adsorption member was produced as Example 13 by the procedure described in the third embodiment above.
The annealing treatment was carried out under atmospheric pressure as in Example 1.
The measurement results of each physical property are shown in Table 1.

[Examples 14 to 20]
An adsorption member was produced in the same manner as in Example 13, except that the annealing conditions for the aluminum sheet were changed as shown in Table 1.
The annealing treatments in Examples 17-20 were carried out in a vacuum, similar to Examples 5-8.
The measurement results of each physical property are shown in Table 1.

[Examples 21 and 22]
An adsorption member was prepared in the same manner as in Example 13, except that the aluminum sheets were stacked in the number shown in Table 1.
The measurement results of each physical property are shown in Table 1.

[Example 23]
An adsorbent member was prepared in the same manner as in Example 13, except that zeolite was used as the moisture adsorbent.
The measurement results of each physical property are shown in Table 1.

[Comparative Example 1]
An adsorption member was prepared in the same manner as in Example 1, except that the aluminum sheet was not annealed.
The measurement results of each physical property are shown in Table 2.

[Comparative Example 2]
An adsorption member was prepared in the same manner as in Example 13, except that the aluminum sheet was not annealed.
The measurement results of each physical property are shown in Table 2.

[Comparative Example 3]
An adsorption member was prepared in the same manner as in Example 1, except that a square copper foil was used instead of a square aluminum foil, and no annealing treatment was performed.
The measurement results of each physical property are shown in Table 2.

[Comparative Example 4]
An adsorption member was prepared in the same manner as in Example 1, except that a square piece of copper foil was used instead of a square piece of aluminum foil.
The measurement results of each physical property are shown in Table 2.

[Comparative Example 5]
An adsorption member was prepared in the same manner as in Example 14, except that a circular copper foil was used without being cup-shaped, instead of a circular aluminum foil that was cup-shaped.
The measurement results of each physical property are shown in Table 2.

The adsorption member of the present invention reduces the occurrence of pinholes in packaging materials during the manufacturing process and inhibits deterioration of the adsorption performance of the adsorbent after packaging, making it suitable for use in vacuum insulation materials.

1: Vacuum insulation material 2: Bag body 3: Core material 4, 4A to 4G: Adsorption member 4C, 4D: Core 41: Adsorbent 42, 44, 46, 49: Film 43, 493: Adsorbent storage space 44I, 46I: First film 44II, 46II: Second film 44a, 46a: Bottom portion 44b, 46b: Peripheral side portion 45: Air passage 421, 422, 441, 461: Adsorbent arrangement region 442, 462: Core arrangement region 492: Bag-shaped portion 492a: Opening

Claims (6)

A method for manufacturing an adsorption member,
(a) using an atmospheric electric furnace, annealing an aluminum sheet at 100 to 600° C. for 1 to 3 hours under atmospheric pressure with ON/OFF control or PID control, and then cooling the aluminum sheet to room temperature by natural cooling in the atmospheric electric furnace, or removing the aluminum sheet from the atmospheric electric furnace and natural cooling to room temperature; or (b) using a vacuum heating furnace, annealing an aluminum sheet at 100 to 600° C. for 1 to 3 hours under vacuum with PID control, and then cooling the aluminum sheet to room temperature by vacuum cooling in the vacuum heating furnace ;
The adsorption member is
A moisture absorbent;
a one-layer or multiple-layer sheet-like packaging material, which is folded to form an adsorbent-accommodating space for accommodating the moisture adsorbent, and an air passage extending from the adsorbent-accommodating space to an outside of the packaging material while bending;
The packaging material is formed from annealed aluminum sheets.
A manufacturing method comprising: The method according to claim 1 , comprising the step (b), wherein the operating pressure in the annealing treatment and the cooling treatment is 1000 Pa or less. The manufacturing method according to claim 1, wherein the aluminum sheet contains 98.0% by mass or more of Al, 0.7% by mass or less of Si, 0.7% by mass or less of Fe, 0.1% by mass or less of Cu, 0.05% by mass or less of Mn, 0.05% by mass or less of Mg, and 0.05% by mass or less of Zn. 2. The method of claim 1, wherein the packaging material is a single-ply packaging material formed from a single aluminum sheet, or a multi-ply packaging material formed from multiple overlapping aluminum sheets. The method according to claim 1, wherein the thickness of the annealed aluminum sheet is 8 to 40 μm. A method for producing a vacuum insulation material, comprising the steps of: sealing an adsorption member produced by the method according to claim 1 and a core material in a bag body.

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