Adsorption member and vacuum insulation material equipped with same

Abstract

To provide an adsorbing member easily reused while making it possible to use an adsorbent for a vacuum heat insulation material in a condition of a high activity, and the vacuum heat insulation material including the same.SOLUTION: An adsorbing member 4 used for a vacuum heat insulation material 1 includes: an adsorbent 41 for adsorbing moisture; and a thin film-shaped film 42 which is folded back so as to form an adsorbent receiving space 43 for receiving the adsorbent 41 and a ventilation passage 45 extending from the adsorbent receiving space 43 to an outside space of the film 42, the film 42 being made of a metallic material.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an adsorption member and a vacuum insulation material including the adsorption member. [Background technology]

[0002] Vacuum insulation materials are widely used in buildings, vending machines, cooler boxes, etc. Vacuum insulation materials are formed by accommodating a core material inside a bag having gas barrier properties. The vacuum insulation material exhibits high insulation performance by evacuating air from the area in which the core material is accommodated, creating a near-vacuum state in that area, and then sealing the bag.

[0003] Moisture remaining in the bag after sealing may cause a decrease in the insulating performance of the vacuum insulation material. In response to this, Patent Document 1 discloses a vacuum insulation material 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. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2015-178853 A Summary of the Invention [Problem to be solved by the invention]

[0005] 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.

[0006] 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.

[0007] The present invention has been made in consideration of these problems, and aims to provide an adsorption member that is easily reused while enabling the adsorbent to be used in a vacuum insulation material in a highly active state, and a vacuum insulation material equipped with the adsorption member. [Means for solving the problem]

[0008] According to the present invention, there is provided an adsorption member for use in a vacuum insulation material, comprising an adsorbent that adsorbs moisture, and a thin-film that is folded over to form an adsorbent storage space for storing the adsorbent, and an air passage that extends while bending from the adsorbent storage space to the outside of the film, wherein the film is made of a metal material.

[0009] According to this configuration, since the adsorbent is contained in a film formed of a metal material, adsorption of moisture through the film is suppressed. In addition, the adsorbent can adsorb moisture from the outside of the film 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 adsorbent in a highly active state in the vacuum insulation material.

[0010] In addition, the film formed of a metal material has high heat resistance, so that the adsorbent can be heated while still contained in the film when dehydrating the adsorbent, which makes it easy to reuse the adsorption member according to the present invention.

[0011] In the present invention, the adsorbent is preferably disposed on a film, and the adsorbent-accommodating space is formed by valley-folding the film along a plurality of lines.

[0012] According to this configuration, the adsorbent storage space and the ventilation passage can be easily formed by using a thin film.

[0013] In the present invention, preferably, the film before being valley-folded has a bottom and a peripheral side extending upward from the peripheral edge of the bottom, and an adsorbent placement area in which an adsorbent is placed is provided on the upper surface of the bottom, and the peripheral side covers the periphery of the adsorbent placement area.

[0014] According to this configuration, the movement of the adsorbent arranged in the adsorbent arrangement region on the upper surface of the bottom portion is restricted by the peripheral side portion, so that the film can be valley-folded while the adsorbent is stably arranged in the adsorbent arrangement region without spilling.

[0015] In the present invention, preferably, the film has a first film and a second film, the first film being folded over to form a core having an adsorbent accommodating space and a first air passage extending while bending from the adsorbent accommodating space to the outside of the first film, and the second film being folded over to form a core accommodating space that accommodates the core and a second air passage extending while bending from the core accommodating space to the outside of the second film.

[0016] According to this configuration, the ventilation path extending from the adsorbent-accommodating space to the outside of the film is lengthened by providing the second film, making it possible to adjust the adsorption of moisture via the ventilation path.

[0017] In the present invention, preferably, the multiple lines intersect with each other.

[0018] 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.

[0019] In the present invention, the adsorbent storage space is preferably formed by valley-folding the film along a first pair of lines opposing each other and a second pair of lines opposing each other and intersecting the first pair of lines.

[0020] According to this configuration, the film is folded along the four lines surrounding the adsorbent-containing space, which eliminates any gaps that extend from the adsorbent-containing space to the outside of the film without bending, making it possible to adjust the film so that moisture adsorption through the air passage is restricted.

[0021] In the present invention, preferably, the film has a bag-shaped portion with an opening formed at one end, and the film is further folded inwardly from the opening of the bag-shaped portion to form an adsorbent storage space within the bag-shaped portion.

[0022] According to this configuration, since an adsorbent storage space is formed in the bag-shaped portion, the movement of the adsorbent stored in the adsorbent storage space is restricted within the bag-shaped portion, and as a result, it is possible to fold the film while keeping the adsorbent stably disposed within the bag-shaped portion without spilling it.

[0023] In the present invention, the metal material is preferably aluminum.

[0024] According to this configuration, it is possible to easily fold the film to form the adsorbent-containing space while suppressing adsorption of moisture through the film.

[0025] Furthermore, according to a vacuum insulation material comprising the above-mentioned adsorption member, a core material, and a bag body in which the adsorption member and the core material are sealed, it is possible to use the adsorbent in a highly active state, thereby suppressing the deterioration of the insulating performance of the vacuum insulation material. Effect of the Invention

[0026] According to the present invention, it is possible to provide an adsorbent member that allows the adsorbent to be used in a vacuum insulation material in a highly active state and is easily reusable, and a vacuum insulation material including the adsorbent member. [Brief description of the drawings]

[0027] [Figure 1] 1 is a perspective view showing a vacuum insulation material according to an embodiment. [Diagram 2] FIG. 2 is a cross-sectional view showing the II-II cross section of FIG. [Diagram 3] FIG. 2 is a plan view showing the attraction member according to the first embodiment. [Figure 4] FIG. 4 is a cross-sectional view showing a cross section IV-IV of FIG. [Diagram 5] FIG. 3 is an explanatory diagram showing a manufacturing process of the adsorption member according to the first embodiment. [Figure 6] FIG. 11 is a perspective view showing an attraction member according to a second embodiment. [Figure 7] 10A to 10C are explanatory views showing a manufacturing process of the adsorption member according to the second embodiment. [Figure 8] 13A to 13C are explanatory views showing a manufacturing process of the adsorption member according to the third embodiment. [Figure 9] 13A to 13C are explanatory views showing a manufacturing process of the adsorption member according to the fourth embodiment. [Figure 10] 13A to 13C are explanatory views showing a manufacturing process of the adsorption member according to the fifth embodiment. [Figure 11] 13A to 13C are explanatory views showing a manufacturing process of the adsorption member according to the sixth embodiment. [Figure 12] 13A to 13C are explanatory views showing a manufacturing process of the adsorption member according to the seventh embodiment. [Figure 13] 1A and 1B are perspective views showing an adsorption member according to a first comparative example and explanatory diagrams showing a manufacturing process thereof. [Figure 14] 11A and 11B are perspective views showing an adsorption member according to a second comparative example and explanatory diagrams showing a manufacturing process thereof. [Figure 15] 13A and 13B are perspective views showing an adsorption member according to a third comparative example and explanatory diagrams showing a manufacturing process thereof. [Figure 16] 13A and 13B are perspective views showing an adsorption member according to a fourth comparative example and explanatory diagrams showing a manufacturing process thereof. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] Hereinafter, an embodiment will be described with reference to the accompanying 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 duplicated description will be omitted.

[0029] First, an outline of a vacuum insulation material 1 according to an embodiment will be described with reference to Figures 1 and 2. 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 facilitate understanding of the description, Figures 1 and 2 exaggerate the thicknesses of exterior films 21 and 22, which will be described later.

[0030] 1, the vacuum insulation material 1 has a generally flat plate shape as a whole. The vacuum insulation material 1 has a generally rectangular shape in a plan view, and has a long side 1L and a short side 1S.

[0031] The vacuum insulation material 1 includes a bag body 2 , a core material 3 , and an adsorption member 4 .

[0032] [Bag body] The bag body 2 has exterior films 21, 22. The exterior films 21, 22 are laminated sheets, and include 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 films are made of polyolefin (polyethylene, polypropylene, polyethylene terephthalate)-based films, polystyrene films, acrylonitrile-styrene copolymers, acrylonitrile-butadiene-styrene films, methacrylic films, polycarbonate films, polyvinyl alcohol films, ethylene vinyl alcohol films, nylon films, and polyamide resin films. By making the thickness of the protective films 10 μm or more, damage to the exterior films 21, 22 can be effectively prevented.

[0033] The gas barrier film is composed of a metal foil such as aluminum, stainless steel, or copper, a vapor-deposited film of aluminum, silica, or alumina, or a resin film such as an ethylene-vinyl alcohol copolymer or polyvinyl alcohol. By making the thickness of the gas barrier film 10 μm or more, damage to the exterior films 21 and 22 can be effectively prevented.

[0034] The fusible film is disposed in the innermost layer of the laminated sheet for the purpose of fusing the exterior films 21, 22 together. 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. By setting the thickness of the fusible film to 25 μm or more, the sealing property of the fused part where the fusible films are fused together can be improved, and leakage from the fused part after vacuum packaging can be prevented.

[0035] The bag body 2 is arranged such that the exterior films 21, 22 thus configured are overlapped with the surfaces on which the fusible films are arranged facing each other. The exterior films 21, 22 are partially fused within the plane.

[0036] In detail, the exterior films 21, 22 are both 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.

[0037] 2, 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 to form a core material accommodating space 27 inside the bag body 2. The core material accommodating 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 to provide airtightness.

[0038] [Core material] The core material 3 has a flat shape and is accommodated in the core material accommodation 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 composed of an inorganic fiber mat, a porous material, and a powder molding. 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. In addition, examples of the porous material include aerogel, 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 suitably used. The core material 3 may be a single layer body made of one inorganic fiber mat, or a laminated body in which two to four inorganic fiber mats are laminated.

[0039] 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 thermal insulation performance.

[0040] [Adsorption material] 2, the suction member 4 is accommodated in the core accommodating space 27 of the bag body 2 together with the core 3. Specifically, the suction member 4 is embedded in the core 3. The suction member 4 can adopt various forms, such as the first and second embodiments described below.

[0041] [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 provided. At this time, the short side fusion part 25b has not yet been provided, so the core material accommodation space 27 is in communication with the outside at one of the short sides 1S.

[0042] Next, the core 3 and the adsorption member 4 are inserted into the core-accommodating space 27 from the short side 1S side. Then, using a vacuum packaging machine, air is exhausted from the core-accommodating space 27 containing the core 3 and the adsorption member 4 through the short side 1S. This reduces the pressure inside the core-accommodating space 27 to about 1 to 2 Pa.

[0043] Next, the exterior films 21, 22 are heated at the portions corresponding to the short side fused portion 25b. When the fusible film is melted by heating, the short side fused portion 25b is formed. This seals the core material accommodating space 27, and the core material 3 and the adsorption member 4 are vacuum-packaged in the core material accommodating 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, 22, completing the vacuum insulation material 1.

[0044] 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.

[0045] In the above-mentioned manufacturing process, air may remain in the core material accommodating space 27. The moisture (i.e., water vapor) contained in this air functions as a heat transfer material in the core material accommodating 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 adsorbent member 4 adsorb the moisture in the core material accommodating space 27.

[0046] <First Example> Next, an adsorption member 4A according to a first embodiment will be described with reference to Fig. 3 to Fig. 5. The adsorption member 4A according to the first embodiment can function as the adsorption member 4 used in the above-mentioned vacuum insulation material 1. Fig. 3 is a plan view showing the adsorption member 4A, and Fig. 4 is a cross-sectional view showing the IV-IV cross section of Fig. 3. Fig. 5 is an explanatory diagram showing a manufacturing process of the adsorption member 4A.

[0047] The adsorption member 4A includes an adsorbent 41 and a film .

[0048] [Adsorbent] The adsorbent 41 is a substance that adsorbs moisture, and is, for example, calcium oxide, magnesium oxide, zeolite, MOF (metal organic framework) silica gel, activated carbon, barium oxide, barium-lithium alloy, or a mixture thereof. From the viewpoints of moisture adsorption performance and productivity, and ease of heating and reuse, the adsorbent 41 is preferably calcium oxide or zeolite. The adsorbent 41 according to the first embodiment is in a powder or granular form and does not have a fixed shape.

[0049] [film] The film 42 is thin and has main surfaces 420a, 420b as described later (see FIG. 5). Specifically, the film 42 is a substantially square aluminum foil with a thickness of 11 μm and a side dimension of 150 mm. The film 42 is formed by rolling an aluminum material and has malleability. The film 42 also has a high gas barrier property compared to paper, nonwoven fabric, etc. In other words, the film 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 film 42 easily foldable without being damaged, the thickness of the film 42 is preferably 25 μm or less.

[0050] 4, the film 42 is folded to form an adsorbent-containing space 43 therein. Furthermore, an air passage 45, which is a minute gap, is formed between the folded portions of the film 42. The air passage 45 extends while bending from the adsorbent-containing space 43 to the outside of the film 42. That is, the adsorbent-containing space 43 communicates with the outside of the film 42 via the air passage 45. The adsorbent 41 is contained in the adsorbent-containing space 43.

[0051] [Manufacturing process of adsorption material] When manufacturing such an adsorbent member 4A according to the first embodiment, first, as shown in Fig. 5(A), the adsorbent 41 is arranged in the adsorbent arrangement region 421 of the film 42. The adsorbent arrangement region 421 is a virtual region having a substantially square shape located in the center on one main surface 420a of the film 42.

[0052] Next, the film 42 is valley-folded along the imaginary lines V11 and V12. The imaginary lines V11 and V12 are an example of a "first pair of lines" according to the present invention, 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 arrangement region 421, and the imaginary line V12 is located closer to the side 42b than the adsorbent arrangement region 421.

[0053] In detail, first, the film 42 is valley-folded along the imaginary line V11 as shown by the arrow F11. As a result, the adsorbent placement region 421 is covered by the portion of the film 42 closer to the side 42a. Then, the film 42 is valley-folded along the imaginary line V12 as shown by the arrow F12. Fig. 5(B) shows the film 42 valley-folded along the imaginary lines V11 and V12.

[0054] Next, the film 42 is valley-folded along the imaginary lines V13 and V14. The imaginary lines V13 and V14 are an example of a "second pair of imaginary lines" according to the present invention, 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 arrangement region 421, and the imaginary line V14 is located closer to the side 42d than the adsorbent arrangement region 421.

[0055] In detail, first, the film 42 is valley-folded along the imaginary line V13 as shown by the arrow F13, and then, the film 42 is valley-folded along the imaginary line V14 as shown by the arrow F14.

[0056] This results in the formation of an attraction member 4A that is substantially square in plan view, as shown in Fig. 3. That is, the attraction member 4A is formed by making valley folds of the film 42 four times and then folding them over.

[0057] <Second Example> Next, an adsorption member 4B according to a second embodiment will be described with reference to Fig. 6 and Fig. 7. The adsorption member 4B according to the second embodiment can also function as the adsorption member 4 used in the vacuum insulation material 1 described above. 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 according to the first embodiment will be omitted as appropriate.

[0058] 7(A), the adsorbent 41 is placed in the adsorbent placement region 422 of the film 42. The adsorbent placement region 421 is a virtual region having a substantially triangular shape located in the center of one main surface 420a of the film 42.

[0059] Next, the film 42 is valley-folded along the imaginary line V21 as indicated by the arrow F21. The imaginary line V21 is a straight line, and is positioned along one side of the adsorbent arrangement region 421. Fig. 7(B) shows the film 42 valley-folded along the imaginary line V21.

[0060] Next, the film 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 located along the other side of the adsorbent arrangement region 421. The imaginary line V22 also intersects with the imaginary line V21. Fig. 7(C) shows the film 42 valley-folded along the imaginary line V22.

[0061] Next, the film 42 is valley-folded along the imaginary line V23 as indicated by the arrow F23. The imaginary line V23 is a straight line and is located along yet another side of the adsorbent arrangement region 421. In addition, the imaginary line V23 intersects with the imaginary lines V21 and V22.

[0062] This results in the formation of adsorption member 4B that has a polygonal shape in plan view, as shown in Fig. 6. That is, adsorption member 4B is formed by making three valley folds and then overlapping film 42. Film 42 has therein an adsorbent-containing space (not shown) and an air passage (not shown) that extends from the adsorbent-containing space to the outside of film 42 while bending.

[0063] <Third Example> Next, an adsorption member 4C according to a third embodiment will be described with reference to Fig. 8. The adsorption member 4C according to the third embodiment can also function as the adsorption member 4 used in the vacuum insulation material 1 described above. 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.

[0064] The film 44 used in the adsorption member 4C according to the third embodiment has a cup shape. In detail, the film 44 is formed by folding a substantially circular aluminum foil, and has a bottom portion 44a having a substantially circular shape in a plan view, and a peripheral side portion 44b extending upward from the periphery of the bottom portion 44a.

[0065] 8(A), the adsorbent 41 is placed in the adsorbent placement region 441 of the film 44. The adsorbent placement region 441 is a virtual region having a substantially circular shape located on the upper surface of the bottom portion 44a. The peripheral side portion 44b covers the periphery of the adsorbent placement region 441, so that the movement of the adsorbent 41 placed in the adsorbent placement region 441 is restricted by the peripheral side portion 44b.

[0066] Next, the film 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 region 443. Fig. 8(B) shows the film 44 valley-folded along the imaginary lines V31 and V32.

[0067] Next, the film 44 is valley-folded along the imaginary line V33 as shown by the arrow F33, and further 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.

[0068] This results in the formation of an adsorption member 4C (see FIG. 10) that is substantially square in plan view. That is, the adsorption member 4C is formed by folding the film 44 four times. The film 44 has therein an adsorbent-containing space (not shown) and an air passage (not shown) that extends from the adsorbent-containing space to the outside of the film 44 while bending.

[0069] <Fourth Example> Next, an adsorption member 4D according to a fourth embodiment will be described with reference to Fig. 9. The adsorption member 4D according to the fourth embodiment can also function as the adsorption member 4 used in the vacuum insulation material 1 described above. 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 according to the first embodiment will be omitted as appropriate.

[0070] The film 46 used in the adsorption member 4D according to the fourth embodiment is also cup-shaped. In detail, the film 46 is formed by folding a substantially rectangular aluminum foil, and has a bottom portion 46a having a substantially rectangular shape in a plan view, and a peripheral side portion 46b extending upward from the peripheral edge of the bottom portion 46a.

[0071] 9(A), the adsorbent 41 is placed in the adsorbent placement region 461 of the film 46. The adsorbent placement region 461 is a virtual region having a substantially rectangular shape located on the upper surface of the bottom portion 46a. Since the peripheral side portion 46b covers the periphery of the adsorbent placement region 461, the movement of the adsorbent 41 placed in the adsorbent placement region 461 is restricted by the peripheral side portion 46b.

[0072] Next, the film 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 arrangement region 461. Fig. 9(B) shows the film 46 valley-folded along the imaginary lines V41 and V42.

[0073] Next, the film 46 is valley-folded along the imaginary line V43 as shown by the arrow F43, and further 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.

[0074] This results in the formation of an adsorption member 4D (see FIG. 11) that is substantially square in plan view. That is, the adsorption member 4C is formed by folding the film 46 four times. The film 46 has therein an adsorbent-containing space (not shown) and an air passage (not shown) that extends from the adsorbent-containing space to the outside of the film 46 while bending.

[0075] <Fifth Example> Next, an adsorption member 4E according to a fifth embodiment will be described with reference to Fig. 10. The adsorption member 4E according to the fifth embodiment can also function as the adsorption member 4 used in the vacuum insulation material 1 described above. 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 according to the first embodiment will be omitted as appropriate.

[0076] The film used in the adsorption member 4E according to the fifth embodiment includes a film 44I and a film 44II. The film 44I is an example of the "first film" according to the present invention, and the film 44II is an example of the "second film" according to the present invention, both of which are the same as the film 44 according to the third embodiment described above.

[0077] The adsorption member 4E is manufactured by packaging the adsorption member 4C according to the third embodiment with a film 44II. In other words, the adsorption member 4C is manufactured by doubly packaging the adsorbent 41 with two films 44. In detail, the adsorption member 4C according to the third embodiment is first manufactured using a film 44I. In the following description, the adsorption member 4C is referred to as a "core 4C." An air passage (not shown) that extends while bending from an adsorbent storage space (not shown) inside the core 4C to the outside of the film 44I is an example of a "first air passage" according to the present invention.

[0078] 10(A), the core 4C is placed in the core placement region 442 of the film 44II. The core placement region 442 is a virtual region having a substantially circular shape located on the upper surface of the bottom portion 44a. Since the peripheral side portion 44b covers the periphery of this core placement region 442, the movement of the core 4C placed in the core placement region 442 is restricted by the peripheral side portion 44b.

[0079] Next, the film 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 arrangement region 442. Fig. 10(B) shows the film 44II valley-folded along the imaginary lines V51 and V52.

[0080] Next, the film 44II is valley-folded along the imaginary line V53 as shown by the arrow F53, and further 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.

[0081] This results in the formation of the suction member 4E, which is substantially square in plan view. That is, the suction member 4E is formed by folding the films 44I and 44II four times each. Inside the film 44II, a core accommodating space (not shown) for accommodating the core 4C and an air passage (not shown) extending from the core accommodating space to the outside of the film 44II are formed. The air passage is an example of the "second air passage" according to the present invention.

[0082] The adsorbent accommodating space of the adsorbing member 4E communicates with the outside of the film 44II via an air passage (first air passage) that extends while bending from the adsorbent accommodating space to the core accommodating space, and an air passage (second air passage) that extends while bending from the core accommodating space to the outside of the film 44II. This allows the adsorbent 41 (see FIG. 8(A)) to adsorb moisture from the outside of the film 44II via both air passages.

[0083] <Sixth Example> Next, an adsorption member 4F according to a sixth embodiment will be described with reference to Fig. 11. The adsorption member 4F according to the sixth embodiment can also function as the adsorption member 4 used in the vacuum insulation material 1 described above. Fig. 11 is an explanatory diagram showing a manufacturing process of the adsorption member 4F. Descriptions of parts of the configuration of the adsorption member 4F that are common to the configuration of the adsorption member 4A according to the first embodiment will be omitted as appropriate.

[0084] The film used in the adsorption member 4E according to the sixth embodiment includes a film 46I and a film 46II. The film 46I is an example of the "first film" according to the present invention, and the film 46II is an example of the "second film" according to the present invention, both of which are the same as the film 46 according to the fourth embodiment described above.

[0085] The adsorption member 4F is manufactured by packaging the adsorption member 4D according to the fourth embodiment with a film 46II. In other words, the adsorption member 4F is manufactured by doubly packaging the adsorbent 41 with two films 46. In detail, the adsorption member 4D according to the fourth embodiment is first manufactured using a film 46I. In the following description, the adsorption member 4D is referred to as a "core 4D." An air passage (not shown) that extends while bending from an adsorbent storage space (not shown) inside the core 4D to the outside of the film 46I is an example of a "first air passage" according to the present invention.

[0086] 11(A), the core 4D is placed in the core placement area 462 of the film 46II. The core placement area 462 is a virtual area having a substantially rectangular shape located on the upper surface of the bottom portion 46a. Since 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.

[0087] Next, the film 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 arrangement region 462. Fig. 11(B) shows the film 44II valley-folded along the imaginary lines V61 and V62.

[0088] Next, the film 46II is valley-folded along the imaginary line V63 as shown by the arrow F63, and further 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.

[0089] This results in the formation of the suction member 4F, which is substantially square in plan view. That is, the suction member 4F is formed by folding the films 46I and 46II four times each. Inside the film 46II, a core accommodating space (not shown) for accommodating the core 4D and an air passage (not shown) extending from the core accommodating space to the outside of the film 46II are formed. The air passage is an example of the "second air passage" according to the present invention.

[0090] The adsorbent accommodating space of the adsorbing member 4F communicates with the outside of the film 46II via an air passage (first air passage) that extends while bending from the adsorbent accommodating space to the core accommodating space, and an air passage (second air passage) that extends while bending from the core accommodating space to the outside of the film 46II. This allows the adsorbent 41 (see FIG. 9(A)) to adsorb moisture from the outside of the film 46II via both air passages.

[0091] <Seventh Example> Next, an adsorption member 4G according to a seventh embodiment will be described with reference to Fig. 12. The adsorption member 4G according to the seventh embodiment can also function as the adsorption member 4 used in the vacuum insulation material 1 described above. 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 according to the first embodiment will be omitted as appropriate.

[0092] The film 49 used in the adsorption member 4G according to the seventh embodiment has a bag shape. In detail, the film 49 is formed by overlapping a first film portion 49I and a second film portion 49II, each of which has a substantially rectangular shape in a plan view, and providing fused portions 491 along three sides. As a result, the film 49 has a bag-shaped portion 492 in which an opening 492a is formed. The bag-shaped portion 492 communicates with the outside at the opening 492a.

[0093] When manufacturing the adsorption member 4G, first, the adsorbent 41 is inserted into the bag-shaped portion 492 through the opening 492a. The movement of the adsorbent 41 arranged in the bag-shaped portion 492 is restricted by the fused portion 491.

[0094] Next, film 49 is valley-folded in order along imaginary lines V71, V72, and V73 as indicated by arrows F71, F72, and F73. Imaginary lines V71, V72, and V3 are all straight lines, and are positioned approximately parallel to each other on the inside of bag-shaped portion 492 relative to opening 492a.

[0095] This results in the formation of an adsorption member 4G that is substantially square in plan view. That is, the adsorption member 4G is formed by folding the film 49 three times. The film 49 forms an adsorbent-containing space 493 in the bag-shaped portion 492, and an air passage (not shown) that extends while bending from the adsorbent-containing space 493 to the outside of the film 49 (i.e., to the opening 492a).

[0096] The present inventors conducted the evaluation test described below on the adsorption members 4A to 4G according to the first to seventh examples, and evaluated their performance. In the evaluation test, in addition to the adsorption members 4A to 4G, the performance of an adsorption member according to a comparative example was also evaluated. The adsorption member according to the comparative example will be described below.

[0097] <First Comparative Example> First, an adsorption member 4H according to a first comparative example will be described with reference to Fig. 13. Fig. 13 is a perspective view showing the adsorption member 4H and an explanatory diagram showing the manufacturing process thereof. Among the configuration of the adsorption member 4H, the description of the parts common to the configuration of the adsorption member 4A according to the first embodiment will be omitted as appropriate.

[0098] 13(B), the adsorbent 41 is placed in the adsorbent placement region 423 of the film 42. The adsorbent placement region 423 is a virtual region located in the center of one main surface 420a of the film 42, closer to the side 42b.

[0099] Next, the film is folded along the imaginary line V81 as shown by the arrow F81. The imaginary line V81 is a straight line that extends so as to divide one main surface 420a of the film into approximately two equal parts.

[0100] As a result, as shown in Fig. 13(A), the attraction member 4H is configured to have a substantially rectangular shape in a plan view. That is, the attraction member 4H is configured by making a valley fold of the film 42 once and then folding it over.

[0101] <Second Comparative Example> Next, an adsorption member 4I according to a second comparative example will be described with reference to Fig. 14. Fig. 14 is a perspective view showing the adsorption member 4I and an explanatory diagram showing the manufacturing process thereof. Among the configuration of the adsorption member 4I, the description of the parts common to the configuration of the adsorption member 4A according to the first embodiment will be omitted as appropriate.

[0102] 14(B), the adsorbent 41 is placed in the adsorbent placement region 424 of the film 42. The adsorbent placement region 424 is a virtual region located in the center of one main surface 420a of the film 42.

[0103] Next, the film 42 is valley-folded along the imaginary lines V91 and V92. The imaginary lines V92 and V92 are straight lines extending substantially parallel to each other. The imaginary line V92 is located closer to the side 42a than the adsorbent disposing region 421, and the imaginary line V92 is located closer to the side 42b than the adsorbent disposing region 421.

[0104] In detail, first, the film 42 is valley-folded along the imaginary line V91 as shown by the arrow F91. As a result, the adsorbent disposing region 424 is covered by the portion of the film 42 closer to the side 42a. Then, the film 42 is valley-folded along the imaginary line V92 as shown by the arrow F92.

[0105] 14(A), an attraction member 4I having a substantially rectangular shape in a plan view is formed. That is, the attraction member 4I is formed by making a valley fold of the film 42 twice and folding it over.

[0106] <Third Comparative Example> Next, an adsorption member 4J according to a third comparative example will be described with reference to Fig. 15. Fig. 15 is a perspective view showing the adsorption member 4J and an explanatory diagram showing the manufacturing process thereof. Among the configuration of the adsorption member 4J, the description of the parts common to the configuration of the adsorption member 4A according to the first embodiment will be omitted as appropriate.

[0107] 15(B), the adsorbent 41 is placed in the adsorbent placement region 425 of the film 42. The adsorbent placement region 425 is a virtual region located in the center of one main surface 420a of the film 42.

[0108] Next, the film 42 is rolled as shown by arrows R11 and R12 to form the film 42 into a cylindrical shape. That is, the portion of the film 42 closer to the side 42a is curved as shown by arrow R11, and this portion is disposed above the adsorbent disposing region 425. Furthermore, the portion of the film 42 closer to the side 42b is curved as shown by arrow R12, and this portion is disposed above the portion closer to the side 42a.

[0109] Next, the film 42 (not shown) now in a cylindrical shape is twisted by approximately 180° at a location spaced away from the sides 42c and 42d toward the center of the main surface 420a.

[0110] 15(A), an attraction member 4J having twisted portions 47, 47 is formed. That is, the attraction member 4J is formed without folding the film .

[0111] <Fourth Comparative Example> Next, an attraction member 4K according to a fourth comparative example will be described with reference to Fig. 16. Fig. 16 is a perspective view showing the attraction member 4K and an explanatory diagram showing the manufacturing process thereof. Of the configuration of the attraction member 4K, the description of the parts common to the configuration of the attraction member 4A according to the first embodiment will be omitted as appropriate.

[0112] 16(B), the adsorbent 41 is placed in the adsorbent placement region 426 of the film 42. The adsorbent placement region 426 is a virtual region located in the center of one main surface 420a of the film 42.

[0113] Next, the film 42 is rolled as shown by arrows R21 and R22 to form the film 42 into a cylindrical shape. That is, the portion of the film 42 closer to the side 42a is curved as shown by arrow R21, and this portion is disposed above the adsorbent disposing region 426. Furthermore, the portion of the film 42 closer to the side 42b is curved as shown by arrow R22, and this portion is disposed above the portion closer to the side 42a.

[0114] Next, the film 42 (not shown) now in a cylindrical shape is folded in a valley at a portion spaced from the sides 42c, 42d toward the center of the main surface 420a to form folded-back portions 48, 48.

[0115] In this way, the attraction member 4K shown in Fig. 16(A) is formed. That is, the attraction member 4K is formed by forming the film 42 into a cylindrical shape and then folding it twice in a valley shape.

[0116] <Fifth Comparative Example> Next, an adsorption member (not shown) according to a fifth comparative example will be described. The adsorption member according to the fifth comparative example uses a nonwoven fabric as a film that contains the adsorbent 41. The nonwoven fabric is made of polyester and has a thin, approximately square shape with each side measuring 150 mm, and has a basis weight of 50 g / m2. 2 Moreover, the nonwoven fabric is valley-folded four times and then folded over, in the same manner as the film 42 according to the first embodiment described above, to form an adsorbent-containing space therein.

[0117] <Sixth Comparative Example> Next, an adsorption member (not shown) according to a sixth comparative example will be described. As with the adsorption member according to the fifth comparative example, the adsorption member according to the sixth comparative example uses a nonwoven fabric as a film that contains the adsorbent 41. As shown in Fig. 2 of the above-mentioned Patent Document 1, a part of the nonwoven fabric is twisted to form an adsorbent-containing space therein.

[0118] <Evaluation test> Next, an evaluation test performed on the adsorbent members according to the first to seventh examples and the adsorbent members according to the first to sixth comparative examples will be described. In this evaluation test, two types of adsorbent members using different adsorbents 41 were manufactured in each of the examples and comparative examples. Specifically, an adsorbent member using 5 g of calcium oxide as the adsorbent 41 and an adsorbent member using 5 g of MFI type zeolite as the adsorbent 41 were manufactured.

[0119] First, the adsorbent 41 used in each adsorption member was sufficiently dehydrated. In particular, for adsorption members 4A-4G according to the first to seventh examples and adsorption members 4H-4K according to the first to fourth comparative examples in which aluminum foil was used as the film, the adsorbent 41 was heated in an electric furnace while contained in the film. On the other hand, for the adsorption members according to the fifth and sixth comparative examples in which nonwoven fabric was used as the film, only the adsorbent 41 was heated in the electric furnace because the nonwoven fabric could not withstand heating by the electric furnace.

[0120] Next, each adsorption member was placed in a thermo-hygrostat maintained at a temperature of 35° C. and a relative humidity of 80%. The temperature and relative humidity were set based on the assumption that each adsorption member would be placed in a hot and humid environment in summer.

[0121] After 90 hours had passed since they were placed in the thermo-hygrostat, each adsorption member was removed from the thermo-hygrostat. Then, a vacuum insulation material was manufactured using each adsorption member as the above-mentioned adsorption member 4. Here, a rotary pump and a mechanical booster pump were used in combination to draw a vacuum until the inside of the vacuum packaging machine was 2 Pa or less. Then, a diffusion pump was used to draw a vacuum for 3 minutes. After that, a portion of the exterior films 21 and 22 corresponding to the above-mentioned short side fused portion 25b was heated to provide the short side fused portion 25b (see FIG. 1).

[0122] Next, the thermal conductivity of each vacuum insulation material thus manufactured was measured. Here, the thermal conductivity of each vacuum insulation material was measured using a thermal conductivity measuring device HC076-600 (manufactured by Eiko Seiki Co., Ltd.) with the temperature of the upper plate set at 10°C and the temperature of the lower plate set at 30°C. As a result, the results shown in Table 1 were obtained.

[0123] [Table 1] Unit: mW / (m K)

[0124] As described above, from the viewpoint of practicality, the thermal conductivity of the vacuum insulation material is preferably 2.5 mW / (m·K) or less. As shown in Table 1, in the vacuum insulation materials using the adsorption member 4A according to the first embodiment (see Figs. 3 to 5) and the adsorption members 4C to 4G according to the third to seventh embodiments (see Figs. 8 to 12), the thermal conductivity was below 2.5 mW / (m·K) regardless of whether calcium oxide or zeolite was used as the adsorbent 41. That is, even after the adsorption members 4A, 4C to 4G were placed in a high-temperature and high-humidity thermostatic chamber for 90 hours, the vacuum insulation materials using the adsorption members 4A, 4C to 4G had sufficient thermal insulation performance for practical use.

[0125] This favorable result is believed to be due to the fact that the adsorbent 41 of the adsorbing members 4A, 4C to 4G adsorbed the moisture remaining in the core-accommodating space 27 (see FIG. 2) through the ventilation path. In other words, this result indicates that the adsorbent 41 had sufficient moisture adsorption performance even after the adsorbing members 4A, 4C to 4G were placed in the thermo-hygrostat for 90 hours. This suggests that the moisture adsorption of the adsorbent 41 through the ventilation path while the adsorbing members 4A, 4C to 4G were placed in the thermo-hygrostat was appropriately restricted due to the bending of the ventilation path.

[0126] In the vacuum insulation material using the adsorbent 4B according to the second embodiment (see Figs. 6 and 7), when the adsorbent 41 was calcium oxide, the measured thermal conductivity value exceeded 2.5 mW / (m K). However, when the adsorbent 41 was zeolite, the measured thermal conductivity value was 2.41 mW / (m K), which indicates that the vacuum insulation material is sufficiently practical.

[0127] On the other hand, in the vacuum insulation materials using the adsorbing members 4H to 4K according to the first to fourth comparative examples (see Figs. 13 to 16), the thermal conductivity exceeded 2.5 mW / (m·K) regardless of whether calcium oxide or zeolite was used as the adsorbent 41. In other words, the insulating performance of the vacuum insulation materials using the adsorbing members 4H to 4K after being placed in a thermo-hygrostat for 90 hours was not sufficient for practical use.

[0128] This result is considered to be due to the fact that the adsorbent 41 of the adsorbent members 4H to 4K was unable to sufficiently adsorb the moisture remaining in the core material accommodating space 27. In other words, this result indicates that the adsorbent 41 of the adsorbent members 4H to 4K did not have sufficient moisture adsorption performance after the adsorbent members 4H to 4K were placed in the thermo-hygrostat chamber for 90 hours. It is considered that while placed in the thermo-hygrostat chamber, the adsorbent members 4H to 4K excessively adsorbed moisture from outside the film 42 through the gaps in the film 42, causing them to lose their moisture adsorption performance.

[0129] Moreover, in the vacuum insulation materials using the adsorbent members according to the fifth and sixth comparative examples, the thermal conductivity exceeded 2.5 mW / (m K) regardless of whether calcium oxide or zeolite was used as the adsorbent 41. In other words, the insulating performance of the vacuum insulation material using the adsorbent member after being placed in a thermo-hygrostat for 90 hours was not sufficient for practical use.

[0130] This result is believed to be due to the fact that the adsorbent 41 of the adsorbent members according to the fifth and sixth comparative examples was unable to sufficiently adsorb the moisture remaining in the core material accommodating space 27. In other words, this result indicates that the adsorbent 41 did not have sufficient moisture adsorption performance after each adsorbent member was placed in the thermo-hygrostat chamber for 90 hours. It is believed that each adsorbent member excessively adsorbed moisture from the outside of the film through the nonwoven film while placed in the thermo-hygrostat chamber, causing it to lose its moisture adsorption performance.

[0131] [Effects] Next, the effects of the configurations of the attraction members 4A to 4G according to the first to seventh embodiments will be described.

[0132] According to the configuration of the adsorption members 4A to 4G, the adsorbent 41 is contained in the films 42, 44, 46, and 49 formed of a metal material, so that adsorption of moisture through the films 42, 44, 46, and 49 is suppressed. The adsorbent 41 can adsorb moisture from the outside of the films 42, 44, 46, and 49 through the air passages, but the air passages extend while bending. Therefore, by adjusting the degree of bending of the air passages, it is possible to adjust the adsorption of moisture through the air passages. As a result, the adsorbent 41 can be used in the vacuum insulation material 1 in a highly active state.

[0133] By heating calcium oxide and zeolite to about 500°C to remove water, it is possible to recover their moisture adsorption performance and return them to a highly active state. The films 42, 44, 46, and 49 made of a metal material have high heat resistance. Therefore, when removing water from the adsorbent 41, the adsorbent 41 can be heated while still contained in the films 42, 44, 46, and 49. In other words, the configuration of the adsorbing members 4A-4G makes it easy to reuse the adsorbing members 4A-4G.

[0134] The adsorbent 41 is disposed on the films 42, 44, and 46, and the adsorbent storage space is formed by valley-folding the films 42, 44, and 46 along a plurality of imaginary lines. With this configuration, it becomes possible to easily form the adsorbent storage space and the ventilation path with a thin-film film.

[0135] Moreover, the films 44, 46 before being valley-folded have bottoms 44a, 46a and peripheral side parts 44b, 46b extending upward from the periphery of the bottoms 44a, 46a. Adsorbent arrangement areas 441, 461 in which the adsorbent 41 is arranged are provided on the upper surfaces of the bottoms 44a, 46a, and the peripheral side parts 44b, 46b cover the periphery of the adsorbent arrangement areas 441, 461. With this configuration, the movement of the adsorbent 41 arranged in the adsorbent arrangement areas 441, 461 on the upper surfaces of the bottoms 44a, 46a is restricted by the peripheral side parts 44b, 46b. As a result, it becomes possible to valley-fold the films 44, 46 in a state in which the adsorbent 41 is stably arranged in the adsorbent arrangement areas 441, 461 without spilling.

[0136] The film used in the adsorbent member 4E according to the fifth embodiment includes a film 44I (corresponding to a "first film") and a film 44II (corresponding to a "second film"). The film 44I is folded over to form a core 4C having an adsorbent storage space and an air passage (corresponding to a "first air passage") that extends from the adsorbent storage space to the outside of the film 44I while bending. The film 44II is folded over to form a core storage space that stores the core 4C and an air passage (corresponding to a "second air passage") that extends from the core storage space to the outside of the film 44II while bending. With this configuration, the air passage that extends from the adsorbent storage space to the outside of the film is lengthened by providing the film 44II, making it possible to adjust the adsorption of moisture through the air passage.

[0137] In the adsorption members 4A to 4F according to the first to sixth embodiments, the virtual lines intersect with each other. With this configuration, the air passage can be formed so that its ends are also bent. As a result, the degree of bending can be adjusted with a higher degree of freedom, and adsorption of moisture through the air passage 45 can be adjusted.

[0138] In addition, taking the adsorption member 4A according to the first embodiment as an example, the adsorbent-containing space 43 is formed by valley-folding the film 42 along a pair of imaginary lines V11, V12 (corresponding to a "first pair of lines") that face each other, and a pair of imaginary lines V13, V14 (corresponding to a "second pair of lines") that face each other and intersect with the pair of imaginary lines V11, V12. With this configuration, the film 42 is folded over along the four imaginary lines V11 to V14 that surround the adsorbent-containing space 43. As a result, there is no gap that extends from the adsorbent-containing space 43 to the outside of the film 42 without bending, and it is possible to adjust so that adsorption of moisture through the ventilation path 45 is restricted.

[0139] Moreover, the film 49 used in the adsorption member 4G according to the seventh embodiment has a bag-shaped portion 492 with an opening 492a formed at one end. The film 49 is further folded inward from the opening 492a of the bag-shaped portion 492 to form an adsorbent-containing space in the bag-shaped portion 492. According to this configuration, since the adsorbent-containing space is formed in the bag-shaped portion 492, the movement of the adsorbent 41 contained in the adsorbent-containing space is restricted in the bag-shaped portion 492. As a result, it becomes possible to fold the film 49 in a state where the adsorbent 41 is stably arranged in the bag-shaped portion 492 without spilling it.

[0140] Moreover, the metal material forming the films 42, 44, 46, 49 is aluminum. With this configuration, it is possible to easily fold the films 42, 44, 46, 49 to form the adsorbent containing space while suppressing the adsorption of moisture through the films 42, 44, 46, 49.

[0141] Furthermore, according to the vacuum insulation material 1 comprising the adsorption members 4A-4G, the core material 3, and the bag body 2 in which the adsorption members 4A, 4B and the core material 3 are sealed, it is possible to use the adsorbent 41 in a highly active state, thereby suppressing a decrease in the insulating performance of the vacuum insulation material 1.

[0142] The above describes the specific examples of the present invention with reference to the specific examples. However, the present invention is not limited to these specific examples. In other words, even if a person skilled in the art modifies these specific examples as appropriate, they are included in the scope of the present invention as long as they have the characteristics of the present invention. The elements and their arrangements, materials, conditions, shapes, sizes, etc. of the above-mentioned specific examples are not limited to those exemplified, and can be modified as appropriate.

[0143] For example, in the above-described vacuum insulation material 1, a single adsorption member 4 is housed in the bag body 2, but the present invention is not limited to this form. In other words, the vacuum insulation material according to the present invention may have a plurality of adsorption members housed in its bag body.

[0144] In addition, some of the adsorption members housed in the bag may use a film (e.g., nonwoven fabric) formed from a nonmetallic material. Although an adsorption member using nonwoven fabric is not suitable for reuse by heating as described above, it can be manufactured more inexpensively than an adsorption member using a film formed from a metallic material. Therefore, by constructing a vacuum insulation material by housing an adsorption member using a film formed from a metallic material and an adsorption member using nonwoven fabric together in a bag, it becomes possible to adjust the balance between manufacturing costs and moisture adsorption performance. [Explanation of symbols]

[0145] 1: Vacuum insulation material 2: Bag body 3: Core material 4, 4A to 4G: Adsorption members 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 44b, 46b: Side parts 45: Air passage 421, 422, 441, 461: Adsorbent placement area 442,462: Core placement area 492: Pouch-shaped part 492a:Aperture

Claims

1. An adsorption member used in a vacuum insulation material, An adsorbent that adsorbs moisture; a thin-film that is folded to form an adsorbent-accommodating space that accommodates the adsorbent, and an air passage that extends from the adsorbent-accommodating space to an outside of the film while bending; the film is made of a metal material and has a gas barrier property, and the adsorbent-accommodating space and the ventilation path are formed in a state in which the gas barrier property is maintained, the adsorbent is disposed on the film; the adsorbent-containing space is formed by folding the film along a plurality of lines; The film includes a first film and a second film, the first film is folded to form a core having the adsorbent accommodation space and a first air passage extending from the adsorbent accommodation space to an outside of the first film while bending; The second film is folded to form a core accommodating space that accommodates the core, and a second air passage that extends in a curved manner from the core accommodating space to the outside of the second film.

2. The film before being valley-folded has a bottom portion and a peripheral side portion extending upward from a peripheral edge of the bottom portion, An adsorbent placement area in which the adsorbent is placed is provided on an upper surface of the bottom, The adsorption member according to claim 1 , wherein the peripheral side portion covers a periphery of the adsorbent placement area.

3. The adsorption member according to claim 1 , wherein the plurality of lines intersect with each other.

4. The adsorption member according to claim 3, wherein the adsorbent storage space is formed by valley-folding the film 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.

5. The adsorption member according to claim 1 , wherein the metallic material is aluminum.

6. The adsorption member according to claim 1 , A core material; A vacuum insulation material comprising: a bag body in which the adsorption member and the core material are sealed.

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