Heat insulation box body

Abstract

To provide a heat insulation box body that can be easily assembled and dismantled without having a frame structure such as a metal support part or the like, while maintaining excellent heat insulation performance by utilizing a predetermined fixture.SOLUTION: According to a heat insulation box body 100, the heat insulation box body 100 comprising each of foaming bodies 11, and vacuum heat insulation materials 12 each buried in a foaming body 11 comprises: a plurality of panels 10 constituted so as to form a heat insulation space S as one closed space by being assembled in a three-dimensional shape; and a fixture 50 constituted so as to fix the plurality of panels 10 by generating a contact pressure onto a contact surface between panels adjacent to each other, in a state of assembling the plurality of panels 10 into the three-dimensional shape.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a heat insulation box body.

Background Art

[0002] In recent years, energy conservation and resource conservation have been strongly desired from the viewpoints of preventing global warming and the like. In particular, in the field of logistics for transporting and storing various articles such as foods, precision instruments, and pharmaceuticals, heat insulation containers using vacuum insulation panels (VIPs) have come to be used from the viewpoint of efficiently utilizing thermal energy.

[0003] As the vacuum insulation material, for example, a material in which a core material made of glass wool formed using an organic binder is vacuum-sealed in a bag-shaped outer covering material having gas barrier properties is known. The heat insulation principle of the vacuum insulation material is to eliminate as much gas as possible existing inside the vacuum insulation material and reduce heat conduction by the gas.

[0004] For example, Patent Document 1 describes a transport container system including an inner wall element disposed on the inner surface of the wall of the container that can be taken out of the container or inserted into the container.

[0005] Patent Document 2 describes a composite heat insulation material composed of a vacuum insulation material and foamed polystyrene.

[0006] Patent Document 3 describes a heat insulation container in which a vacuum insulation material is used and which can be assembled and disassembled.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Patent Document 3

SUMMARY OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] However, the transport container system of Patent Document 1 is bulky because a casing is essential, and it is difficult to improve logistics efficiency. The composite heat insulating material of Patent Document 2 is a technology of a single panel in which a hot melt adhesive is used for bonding a vacuum heat insulating material and a foam, and the heat insulating performance when the panel is assembled as a container has not been studied. Although a heat insulating container is described in Patent Document 3, a metal support part is essential for assembly, and it is difficult to reduce the size of the entire container. Thus, there has been room for improvement in the technology related to heat insulating containers.

[0009] An object of the present disclosure made in view of such circumstances is to improve the technology related to heat insulating containers.

MEANS FOR SOLVING THE PROBLEMS

[0010] As a result of intensive studies, the present inventor has found that a heat insulating box body that can be easily assembled and disassembled while maintaining excellent heat insulating performance can be obtained by using a predetermined fixture without a frame structure such as a metal support part, and has completed the present disclosure.

[0011] Aspects of the present invention are as follows. [1] A heat insulating box body, including a foam and a vacuum heat insulating material embedded in the foam, and a plurality of panels configured to form a heat insulating space, which is a single closed space, by being assembled into a three-dimensional shape, a fixture configured to generate a contact pressure on a contact surface between adjacent panels to fix the plurality of panels in a state where the plurality of panels are assembled into the three-dimensional shape, and characterized by comprising the above. [2] The heat insulating box body according to the above aspect 1, The heat insulation box body, wherein each panel has a trapezoidal shape in a side cross-sectional view, and the angles formed by the bottom side and each inclined side are equal to each other. [3] The heat insulation box body according to the above aspect 1 or 2, wherein a groove portion linearly extending in a direction orthogonal to the thickness direction of each panel is formed on the contact surface of each panel, and at least a part of the groove portion is filled with a buffer material. [4] The heat insulation box body according to any one of the above aspects 1 to 3, wherein the vacuum heat insulation material is embedded in the foam so that the positions of the vacuum heat insulation materials in the thickness direction of each panel are equal to each other, and the distance between the vacuum heat insulation materials is minimized when the plurality of panels are assembled into the three-dimensional shape. [5] The heat insulation box body according to any one of the above aspects 1 to 4, wherein the material of the foam is any one of a polystyrene resin, a polystyrene-polyolefin composite resin, and a polypropylene resin. [6] The heat insulation box body according to any one of the above aspects 1 to 5, wherein the fixture is detachably installed on the heat insulation box body. [7] The heat insulation box body according to any one of the above aspects 1 to 6, wherein the fixture is a variable-length belt-like member configured to be adjustable in the tightening strength applied to the heat insulation box body. [8] The heat insulation box body according to any one of the above aspects 1 to 6, wherein the fixture is an adhesive belt-like member configured to be attachable so as to cover the joint between the adjacent panels. [9] The heat insulation box body according to any one of the above aspects 1 to 6, wherein the fixture is a container for housing the heat insulation box body, The inner dimensions of the container are set to support the panel bottom surface, which is the side surface facing the side surface on the heat insulation space side of each panel, when the plurality of panels assembled in the three-dimensional shape are accommodated. A heat insulation box body.

[10] A heat insulation box body according to any one of the above aspects 1 to 6, The fixture is configured to fix each corner portion of the heat insulation box body in a state where the plurality of panels are assembled in the three-dimensional shape. A heat insulation box body.

[11] A heat insulation box body according to the aspect 10 described above, The fixture is a corner cap in which at least three planar members are integrally formed continuously at right angles to each other. In a state where the plurality of panels are assembled in the three-dimensional shape, it covers the joint between the panels orthogonal to each other at each corner portion of the heat insulation box body, and is configured to support the panels from three directions at each corner portion. A heat insulation box body.

[12] A heat insulation box body according to the aspect 11 described above, Each panel is provided with a recess having a depth equal to the thickness of the planar member at each corner portion. A heat insulation box body.

Effect of the Invention

[0012] According to the present disclosure, the technology related to the heat insulation container is improved.

Brief Description of the Drawings

[0013]

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Mode for Carrying Out the Invention

[0014] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The same elements in the various embodiments described in each drawing are given the same reference numerals. However, it should be understood that the present disclosure is not limited to these embodiments and can be variously modified within the scope of the gist.

[0015] <First Embodiment> Referring to FIGS. 1 to 7, the heat-insulating box body 100 according to the first embodiment of the present disclosure includes a plurality of panels 10 and a fixture 50. The heat-insulating box body 100 of the present embodiment is obtained by fixing the plurality of panels 10 assembled into a three-dimensional shape with the fixture 50. The plurality of panels 10 assembled into a three-dimensional shape correspond to the upper surface, side surface, and bottom surface of the heat-insulating box body 100. The fixture 50 has a function of enhancing the stability of the three-dimensional shape of the heat-insulating box body 100 by restraining or fixing the heat-insulating box body 100, preventing gaps from forming at the joints between adjacent panels 10, and enhancing the airtightness of the heat-insulating box body 100.

[0016] [Panel] FIG. 2 shows the internal structure of the heat-insulating box body 100 according to the present embodiment. For the sake of illustration, FIG. 2 shows a state in which the panel corresponding to the upper surface of the heat-insulating box body 100 among the plurality of panels 10 and the fixture 50 are removed. FIG. 3 is a schematic side view of the heat-insulating box body 100, and FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3. As shown in FIGS. 2 to 4, the plurality of panels 10 are configured to form a heat-insulating space S, which is a closed space, by being assembled into a three-dimensional shape (here, a box shape). Although not particularly limited, the heat-insulating space S can accommodate heat-sensitive articles such as foods such as fresh foods or processed foods, precision instruments such as semiconductor substrates, and pharmaceuticals such as drugs or specimens.

[0017] The shape of the plurality of panels 10 is not particularly limited, but as shown in FIG. 5, it is preferable that each panel includes a panel upper surface 13, a panel side surface 14, and a panel bottom surface 15. In this case, when the plurality of panels 10 are assembled into a three-dimensional shape, the panel upper surface 13 of each panel corresponds to the inner surface of the heat-insulating box body 100 that defines the heat-insulating space S, and the panel bottom surface 15 of each panel corresponds to the outer surface of the heat-insulating box body 100 that is exposed to the external environment.

[0018] The dimensions of the plurality of panels 10 are not particularly limited, and can be appropriately set according to various conditions such as the contents to be accommodated, the storage location, or the load compartment volume of the transport vehicle (hereinafter also referred to as "logistics conditions"). In the present embodiment, as shown in FIG. 6, the plurality of panels 10 are each a square in which the lengths L1 and L2 of the sides of the panel bottom surface 15 are equal. In this case, the heat-insulating box body 100 obtained by assembling the plurality of panels 10 is a hexahedron composed of six panels of the same size when viewed from above. However, the present invention is not limited to this example, and rectangular panels 10 in which the lengths L1 and L2 of the sides of the panel bottom surface 15 are different may be used. For example, the lengths of the sides of a pair of opposing panels are set as La and Lb (La≠Lb), the lengths of the sides of another pair of opposing panels are set as Lb and Lc (Lb≠Lc), and the lengths of the sides of still another pair of opposing panels are set as Lc and La (Lc≠La). By combining three sets of panels 10 with different side lengths, the heat-insulating box body 100 can be formed into a desired three-dimensional shape other than a hexahedron. For example, by combining two square panels when viewed from above and four rectangular panels when viewed from above, a rectangular parallelepiped heat-insulating box body 100 may be formed.

[0019] The thickness W1 of each panel of the plurality of panels 10 is also not particularly limited, and can be appropriately set according to the logistics conditions. In the present embodiment, the thickness W1 of each panel of the plurality of panels 10 is the same for all panels, but the present invention is not limited to this, and some or all of the panels may have different thicknesses.

[0020] Referring to FIG. 7, which is a cross-sectional view taken along line B-B of FIG. 6, each of the plurality of panels 10 includes a foam 11 and a vacuum heat-insulating material 12 embedded in the foam 11. Note that the cross-section of each panel 10 has a trapezoidal shape in which the angle formed by the bottom side and each inclined side is constant. The longitudinal length L3 of the vacuum heat-insulating material 12 is preferably set such that the vacuum heat-insulating materials 12 of the respective panels are as close to each other as possible when the heat-insulating box body is assembled, but can be arbitrarily set within a range where a desired surface interval (described later) is ensured between the outer surface of the panel.

[0021] [Foam] The foam 11 of this embodiment is integrally formed with a vacuum insulation material 12 described later. The material of the foam 11 may be any material obtained by foaming a thermoplastic resin such as polystyrene resin, polyethylene resin, polyvinyl chloride resin, polystyrene-polyolefin composite resin, polypropylene resin, and (meth)acrylic resin. Particularly, polystyrene resin, polystyrene-polyolefin composite resin, and polypropylene resin are preferable. The material of the foam 11 of this embodiment is preferably a polystyrene-polyethylene (PSPE) bead foam from the viewpoints of impact resistance, oil resistance, chemical resistance, etc., but is not limited thereto, and other bead foams such as expanded polystyrene or foamed polystyrene may be used. Further, the manufacturing method of the foam 11 is not limited to the bead foaming method, and for example, other arbitrary foaming methods such as an extrusion foaming method, an injection foaming method, and a press foaming method may be used. In these cases, the concave surface of the foam and the vacuum insulation material may be adhered by any method such as an adhesive or a double-sided tape. Further, when the foam is bonded to form a panel, the bonding surface may be bonded by any method such as an adhesive or a double-sided tape. The heat insulation box body can also be formed by the panel thus created.

[0022] The shape of the foam 11 is not particularly limited, but in this embodiment, it is formed in a plate shape so as to surround the vacuum insulation material 12, and the vacuum insulation material 12 is embedded in the foam 11. In the present disclosure, "embedded" means not only the case where all surfaces of the vacuum insulation material 12 are surrounded by the foam 11, but also the case where three side surfaces of the vacuum insulation material 12 are surrounded by the foam 11. Further, from the viewpoint of generating a contact pressure on the contact surfaces of adjacent panels in a state where a plurality of panels 10 are assembled into a three-dimensional shape, as shown in FIG. 7, the foam 11 preferably has inclined surfaces formed at both side edges so that the width becomes narrower from the bottom to the top. In this case, each panel of the plurality of panels 10 according to this embodiment has a trapezoidal shape in a side view cross-section, in which the angles R formed by the bottom side and each hypotenuse are equal to each other. When a plurality of the same panels are used to form a heat insulation box body, it is desirable that this angle R be 45°. When a heat insulation box body is formed using panels different from each other, a combination in which the sum of the angles R of two adjacent panels is 90° is desirable. Hereinafter, adjacent panels in a state where a plurality of panels 10 are assembled into a three-dimensional shape are also referred to as "adjacent panels". Thereby, a certain shape can be imparted to each panel 10 and its assembly, and it becomes possible to assemble it into a self-standing three-dimensional shape (here, a box shape). Further, the vacuum insulation material 12 is not exposed to the outside, and it is possible to prevent the vacuum insulation material 12 from being directly exposed to an external environment such as wind, rain, or snow accumulation. However, the shape of the foam 11 is not limited to this example, and for example, the shape of the side view cross-section can also be a rectangular shape.

[0023] In this embodiment, the thickness of the foam 11 (that is, the thickness W1 of the corresponding panel) is not particularly limited, but due to the process constraints of wrapping the bead foam used for the foam 11 around the vacuum insulation material 12 and applying pressure from both sides of the vacuum insulation material 12, the minimum distance (hereinafter, also referred to as "surface distance") between any surface of the panel upper surface 13, the panel side surface 14, or the panel bottom surface 15 and the surface of the vacuum insulation material 12 is preferably 10 mm or more.

[0024] The expansion ratio of the bead foam used for the foam 11 is not particularly limited, but from the viewpoints of puncture resistance and impact resistance, it is preferably 5 to 100 times, more preferably 10 to 50 times, and still more preferably 20 to 30 times. If the expansion ratio of the material used for the foam 11 is 30 times or less, sufficient strength can be obtained to prevent damage such as indentation or holes on each surface of the heat insulation box body 100 due to various impacts occurring at the logistics site, such as assembly, disassembly, storage, transportation, and loading and unloading of contents. In the present embodiment, the foaming conditions (particularly, the foaming conditions of the polystyrene resin and the polystyrene - polyolefin composite resin) for forming an appropriate foam 11 are exemplified below. · Bead size before foaming: Polystyrene resin, average particle diameter 0.75 mm Polystyrene - polyolefin composite resin, average particle diameter 1.6 mm · Foaming temperature: 100°C to 130°C, preferably 110 to 120°C · Foaming pressure: 0.02 MPa to 0.1 MPa, preferably 0.03 MPa to 0.07 MPa

[0025] [Vacuum insulation material] The vacuum insulation material 12 of the present embodiment is embedded in the foam 11 and integrally formed with the foam 11. The vacuum insulation material 12 includes a core material, an adsorbent, and a film having gas barrier properties (hereinafter, also referred to as a "gas barrier film"). The core material and the adsorbent are vacuum - sealed inside the gas barrier film. The internal space of the gas barrier film of the vacuum insulation material 12 of the present embodiment is depressurized by the vacuum evacuation means during manufacturing and the action of the adsorbent. The internal pressure of the vacuum insulation material is not particularly limited, but for example, it is preferably 0.5 to 20 Pa. When the internal pressure is within the above range, heat conduction through the gas inside the vacuum insulation material is suppressed, and the vacuum insulation material tends to have high heat insulation performance.

[0026] The shape of the vacuum insulation material 12 is not particularly limited, but it is preferably formed in a plate shape as shown in FIG. 7 so as to produce a uniform heat insulation effect throughout the panel.

[0027] The thickness W2 of the vacuum insulation material 12 is not particularly limited. For example, it can be set to approximately the same thickness as the foams on the inner and outer sides of the vacuum insulation material 12. Alternatively, from the perspectives of weight reduction of the panel and thermal performance, the ratio of the thickness W1 of the entire foam 11 to the thickness W2 of the vacuum insulation material 12 may be 4:1.

[0028] [Core material] The core material is a member that bears the heat insulation performance of the vacuum insulation material 12. The core material is glass wool. The core material may be a glass wool mat composed of glass wool and an organic binder, may be a single-layer body composed of one glass wool mat, or may be a laminated body in which 2 to 10 glass wool sheets are laminated. When the glass wool fibers are fixed to each other by an organic binder in the glass wool mat, it has appropriate rigidity and is difficult to be crushed, and becomes a core material with a density and inter-fiber thermal conductivity that are not easily increased, so it can contribute to maintaining the heat insulation performance of the vacuum insulation material 12.

[0029] The density of the core material is not particularly limited. However, as the density of the core material in the vacuum insulation material 12 (the density at the time of vacuum insulation material forming), for example, it is preferably 130 kg / m 3 or more and less than 300 kg / m 3 . If the core material density is less than 130 kg / m 3 , the surface smoothness becomes unstable because the amount of glass wool is too small, and the function as a heat insulation material deteriorates, making it difficult to use. When the density of the core material is within the above range, the vacuum insulation material becomes lightweight, and even when the gas barrier film compresses the core material due to a rapid pressure drop during vacuum forming, the core material shape can be sufficiently maintained. The density of the core material can be measured in accordance with JIS A 9521.

[0030] The thickness of the core material is not particularly limited. However, from the perspectives of improving heat insulation, weight reduction, and ease of handling, for example, in the case of a single-layer body, the overall thickness, and in the case of a laminated body, the thickness per layer is preferably 3 to 50 mm.

[0031] [Glass wool] The glass wool is not particularly limited, but for example, it preferably has an average fiber diameter of 2 to 10 μm. When the average fiber diameter of the glass wool is within the above range, while reducing the mat tearing during press molding of the core material, uneven wall thickness of the molded product, and skin irritation caused by the glass wool, it is possible to obtain an appropriate core material strength and excellent heat insulation properties that can suppress the aging deterioration (annual increase in thermal conductivity) of the vacuum insulation material. The average fiber diameter can be measured by the air permeability method or an optical microscope.

[0032] [Organic binder] The organic binder is not particularly limited, and conventionally known ones can be used. Examples include aldehyde condensable thermosetting resins such as phenol resins, ester-based thermosetting resins such as acrylic resins, and binders such as epoxy-based thermosetting resins.

[0033] The content (adhesion amount) of the organic binder in a total of 100% by mass of the glass wool and the organic binder is not particularly limited, but for example, it is preferably 0.5 to 9.0% by mass in terms of solid content. When the content of the organic binder is within the above range, it becomes a lightweight vacuum insulation material, and it is possible to impart appropriate rigidity to the core material. Therefore, even when the gas barrier film compresses the core material due to a rapid pressure drop during vacuum molding, it is possible to sufficiently maintain the core material shape. In addition, the density of the core material and the thermal conductivity between the fibers are less likely to increase, and the generation of outgas is suppressed. Therefore, a vacuum insulation material having excellent thermal conductivity and suppressed aging deterioration (annual increase in thermal conductivity) can be obtained.

[0034] [Adsorbent] The adsorbent is not particularly limited, and one or more adsorbents can be encapsulated. Preferably, it may contain an adsorbent 1 that adsorbs moisture (water vapor) by chemisorption and an adsorbent 2 whose moisture adsorption rate is slower than that of adsorbent 1. By including adsorbents with different moisture adsorption rates, outgases (such as carbon monoxide, carbon dioxide, formaldehyde, amines, or aromatic hydrocarbons, etc.) generated from the core material when an organic binder is used, gases invading from the outside (such as nitrogen, oxygen, or carbon dioxide, etc.), and moisture can be adsorbed more favorably. Thereby, a vacuum insulation material having excellent thermal conductivity and suppressed secular deterioration of heat insulation performance (secular increase in thermal conductivity) can be obtained.

[0035] The form (shape) of the adsorbent is not particularly limited. For example, adsorbent 1 and adsorbent 2 may each be separate powders, pellets, or tablets, etc., or may be powders, pellets, or tablets, etc. of a mixture containing adsorbent 1 and adsorbent 2. Also, after adsorbent 1 covers part or all of the periphery of adsorbent 2, it may be pelletized or tabletized (for example, pellets or tablets having a structure in which adsorbent 2 is the core and is surrounded by a layer of adsorbent 1).

[0036] Preferred examples of the adsorbent include alkaline earth metal oxides such as calcium oxide and magnesium oxide, alkali metal oxides such as sodium oxide, and silica gel. Among them, calcium oxide is preferred because of its particularly fast moisture adsorption rate.

[0037] [Gas barrier film] The gas barrier film is not particularly limited as long as it has gas barrier properties, but it is preferably a multilayer film in which a seal layer and a gas barrier layer are laminated in advance, and more preferably a multilayer film in which a seal layer, a gas barrier layer, and a protective layer are laminated in this order from the side in contact with the core material.

[0038] The thickness of the gas barrier film is not particularly limited, but from the viewpoint of preventing damage or a decrease in vacuum degree, it is preferably thicker than conventional films, for example, 50 to 150 μm.

[0039] The gas barrier layer is a layer that does not allow gas to pass through and is provided from the viewpoint of preventing a decrease in the degree of vacuum of the vacuum insulation material. Examples of the gas barrier layer include a metal foil, a laminated film (vapor-deposited film) obtained by vapor-depositing a metal or the like on a resin film, and the like.

[0040] Examples of the metal of the metal foil include aluminum, copper, stainless steel, iron, etc., and preferably aluminum.

[0041] Examples of the vapor-deposited film include those formed by vapor-depositing a metal such as aluminum, stainless steel, cobalt, nickel or silica, alumina, or a combination thereof by a vapor deposition method, a sputtering method, etc. Examples of the resin film serving as the base material of the vapor-deposited film include films made of thermoplastic resins such as polyester-based resins; polyolefin-based resins; vinyl chloride-based resins; polyamide resins; styrene-based resins; acrylic-based resins, ethylene-vinyl alcohol copolymers, polyvinyl alcohol resins and partially saponified products thereof, and thermosetting resins such as phenolic resins and urea resins.

[0042] The gas barrier layer is preferably a vapor-deposited film obtained by vapor-depositing aluminum on an ethylene-vinyl alcohol copolymer resin, or a vapor-deposited film obtained by vapor-depositing aluminum or silica on a PET resin, or an aluminum foil, or a laminated structure thereof. The metal foil and the vapor-deposited film used for the gas barrier layer are known and can be easily obtained or prepared in the market.

[0043] The thickness of the gas barrier layer is not particularly limited, but in the case of a vapor-deposited film, the thickness of the vapor-deposited film is preferably 200 to 2000 Å, and in the case of a metal foil, it is preferably 5 to 10 μm.

[0044] The seal layer is a layer that can be fused by heating, and is provided for the purpose of fusing gas barrier films together to seal the core material and the adsorbent inside the film. Examples of the seal layer include heat-fusible resin films. Examples of the heat-fusible resin include polyethylene resin, polypropylene resin, and ethylene-vinyl alcohol copolymer. The density of the polyethylene resin film is not particularly limited, but is preferably 0.90 to 0.98 g / cm 3 . The density of the polypropylene resin film is not particularly limited, but is preferably 0.85 to 0.95 g / cm 3 .

[0045] The thickness of the seal layer is not particularly limited, but is preferably 25 to 70 μm because it can enhance the sealing performance of the fused part (the "ear part" described later) where the seal layers are fused together and can prevent leakage from the fused part after vacuum packaging. The heat-fusible resin used for the seal layer is known and can be easily obtained or prepared in the market.

[0046] The protective layer is an arbitrarily provided layer on the gas barrier layer for the purpose of protecting the gas barrier layer.

[0047] Examples of the protective layer include films made of thermoplastic resins such as aromatic polyester-based resins, polyolefin-based resins, vinyl chloride-based resins, polyamide resins, styrene-based resins, and acrylic-based resins, and thermosetting resins such as phenol resins and urea resins.

[0048] The above resins may be used alone or in combination of two or more. The resins used for the protective layer are known and can be easily obtained or prepared in the market.

[0049] The protective layer may contain organic or inorganic fillers. In order to further improve the gas barrier performance of the gas barrier film, a gas barrier resin obtained by polymerizing or copolymerizing vinyl monomers such as vinylidene chloride resin, acrylonitrile resin, and vinyl alcohol resin may be applied, laminated, or the particles thereof may be mixed and dispersed in the resin film layer on the protective layer.

[0050] The thickness of the protective layer is not particularly limited, but from the viewpoint of effectively preventing damage to the gas barrier film, it is preferably 10 to 30 μm.

[0051] In the vacuum heat insulating material 12 of the present embodiment, "ears" in which the seal layers of the gas barrier film are adhered to each other are usually formed around the portion where the core material and the adsorbent are vacuum-sealed. The ears may be folded by "ear folding" in which the ears are folded along the core material, and in this case, it is preferable to fold them on the surface not in contact with the heat source during the construction of the vacuum heat insulating material 12.

[0052] In the vacuum heat insulating material 12 of the present embodiment, as a measure against damage due to heat, impact, etc., a heat insulating material such as glass wool or foam may be bonded to the surface of the vacuum heat insulating material 12 to protect the vacuum heat insulating material 12.

[0053] The manufacturing method of the vacuum insulation material 12 of the present embodiment is not particularly limited, but it can be manufactured by arranging a core material and an adsorbent inside a bag-shaped gas barrier film, discharging the air inside the gas barrier film to reduce the pressure, and then sealing the gas barrier film. The bag-shaped gas barrier film can be produced, for example, by overlapping two gas barrier films so that their seal layers contact each other, and heat-sealing the outer peripheral portion leaving an opening for inserting the core and the adsorbent to form a bag shape. As the method of vacuum sealing, a conventionally known method in the art such as using a vacuum packaging machine can be used. Before vacuum sealing, preferably until immediately before inserting into the vacuum sealing device, by heating and drying the core material and the gas barrier film, the thermal conductivity of the obtained vacuum insulation material can be reduced. The drying temperature is, for example, 130 to 250 °C for the core material and 50 to 80 °C for the gas barrier film. Depending on the shape of the adsorbent, a depression or hole corresponding to the shape of the adsorbent may be provided in the core material in advance so that the position of the adsorbent does not shift during vacuum sealing. In the manufacturing process described above, air may remain in the internal space of the gas barrier film. Since moisture (water vapor) contained in this air functions as a heat transfer substance, there is a risk that the thermal conductivity increases and the heat insulation performance of the vacuum insulation material deteriorates. In the vacuum insulation material 12 of the present embodiment, excellent thermal performance can be exhibited by adsorbing this moisture and the like with the adsorbent.

[0054] <Method for manufacturing panel> For the manufacturing method of the plurality of panels 10, a conventionally known molding method can be used. For example, the vacuum insulation material 12 is arranged inside a restraint body (inside a mold or between restraint plates), and a foamed structure such as an expandable polystyrene bead foam that becomes the material of the foam 11 is expanded inside the restraint body. Then, while applying pressure from both sides in the thickness direction of the vacuum insulation material 12 so that the expanding foamed structures can be integrated, the foamed structures are fused to each other and cured, whereby a composite panel structure in which the vacuum insulation material 12 is embedded in the foam 11 can be manufactured as the panel 10.

[0055] [First modification example of panel] Referring to FIGS. 8A and 8B, the panel 20 which is the first modification of the panel 10 of the present embodiment will be described. As shown in FIG. 8A, in each of the plurality of panels 20 of this modification, a groove portion 26 is formed on the abutting surface of each panel 20. As shown in FIG. 8B, the groove portion 26 is filled with a filler 27.

[0056] [Groove portion] FIGS. 9A and 9B are schematic perspective views showing the groove portion 26. As shown in FIG. 9A, the groove portion 26 is recessed in the inclined surface of the panel side surface 24. As shown in FIG. 9B, the groove portion 26 is filled with a buffer material 27. In the present embodiment, the buffer material 27 fills the entire groove portion 26 from the viewpoint of airtightness, but it is not limited thereto, and it is sufficient that the buffer material 27 fills at least a part of the groove portion 26. The buffer material 27 has a function of buffering the stress when the contact surfaces of adjacent panels abut against each other.

[0057] The shape of the groove portion 26 is not particularly limited, but as shown in FIGS. 8A and 9A, it is preferably linearly extended in a direction orthogonal to the thickness direction of each panel. As shown in FIG. 8A, the groove portion 26 of this modification preferably extends continuously so as to surround all the panel side surfaces 24 of each panel 20.

[0058] The width of the groove portion 26 in the thickness direction of each panel is not particularly limited as long as it is less than the width in the thickness direction of each panel. However, as shown in FIG. 10A, the ratio of the width W3 from the upper surface of the panel to the groove portion 26: the width W4 of the groove portion 26, which is the length ratio of the hypotenuse of the trapezoidal shape in the side view cross section, is preferably 12:13. Thus, arranging the groove portion 26 near the center in the thickness direction of each panel is desirable because when the plurality of panels 20 are assembled into a three-dimensional shape, each part of the foam 11 inside and outside the groove portion 26 in the thickness direction functions as a lid and it is easy to enhance the airtightness of the heat insulating space S.

[0059] [Buffer material] The buffer material 27 is not particularly limited as long as it can buffer the stress when the contact surfaces of adjacent panels come into contact with each other. However, from the viewpoints of the airtightness and handleability of the heat insulation box body 100, it is preferably a rubber-based buffer material such as polyether-based or polyester-based urethane rubber, chloroprene rubber, or ethylene propylene diene rubber (EPDM). The density of the rubber-based buffer material is not particularly limited, but from the viewpoint of airtightness, it is preferably 100 to 1500 kg / m 3 It is preferably this value. However, the buffer material 27 is not limited to this example, and for example, a non-woven fabric made of fibers such as polyester, polypropylene, or polyethylene, or glass fiber can also be used.

[0060] The thickness of the buffer material 27 is not particularly limited, but from the viewpoint of the airtightness of the heat insulation box body 100, as shown in FIG. 10B, it is preferably a thickness equal to or greater than the depth of the groove portion 26.

[0061] The form (shape) of the buffer material 27 is not particularly limited, but as shown in FIG. 9B, it is preferably a sheet-like buffer material continuously filled over the entire bottom surface of the groove portion 26. Thereby, in a state where a plurality of panels 20 are assembled into a three-dimensional shape, it becomes easier to generate a contact pressure on the contact surfaces of adjacent panels to fix the plurality of panels 20. However, the form of the buffer material 27 is not limited to this example, and other forms such as a striped or dot-lined form intermittently filled on the bottom surface of the groove portion 26 may be used.

[0062] The adhesive for fixing the buffer material 27 is not particularly limited as long as it has an adhesive strength such that it does not peel off from the groove portion 26 during ventilation. For example, an acrylic-based or rubber-based adhesive can be used.

[0063] By providing the buffer material 27 in the groove portion 26, when a contact pressure is generated on the contact surface of the adjacent panels, the buffer materials 27 of the adjacent panels can be brought into close contact with each other, and the airtightness of the heat insulation space can be enhanced. As a result, the buffer material 27 can function as an anti-slip member that prevents the adjacent panels from shifting and creating a gap at the joint, making it even easier to fix the plurality of panels 20. Consequently, it becomes easier to further improve the heat insulation performance of the heat insulation box body.

[0064] [Fastener] Referring to FIG. 1, the fastener 50 is configured to generate a contact pressure on the contact surfaces of adjacent panels when a plurality of panels 10 are assembled into a three-dimensional shape (here, a box shape), thereby fixing the plurality of panels 10.

[0065] The fastener 50 is detachably installed with respect to the heat insulation box body 100. In the present disclosure, "detachably installed" means that when restraining the heat insulation box body 100 with the fastener 50, it can be attached to at least a part of the heat insulation box body 100, and when performing operations such as taking out the contents or moving the heat insulation box body 100, the fastener 50 can be removed from the heat insulation box body 100 in order to release the restraint of the heat insulation box body 100 by the fastener 50. Here, "removing the fastener 50 from the heat insulation box body 100" includes not only the case of separating the fastener 50 from the heat insulation box body 100 as a separate body, but also the case of releasing the restraint of the heat insulation box body 100 by the fastener 50 while the fastener 50 is attached to the heat insulation box body 100, such as when at least a part of the fastener 50 is adhered to the heat insulation box body 100.

[0066] The fixture 50 is not particularly limited, and may be a variable-length belt-like member configured to be able to adjust the tightening strength applied to the heat insulating box body 100. For example, the fixture 50 may be a packing band 50A as shown in FIG. 1. The packing band 50A can be bent arbitrarily along the side surface of the heat insulating box body 100, and the heat insulating box body 100 can be restrained by fixing its own length through a locking tool such as a buckle provided at both ends of itself. Thereby, the tightening strength applied to the heat insulating box body 100 can be adjusted. The material of the packing band 50A is not particularly limited, but polyamide, polyethylene terephthalate, polypropylene, fluororesin, or the like can be used. The belt-like member is not limited to the packing band 50A, and may be, for example, an elastic belt having a predetermined elongation rate, density, and effective length. The material of the elastic belt is not particularly limited, but from the viewpoint of stretchability, it is preferably formed by forming a stretchable material such as natural rubber, polyurethane resin, or foamed urethane resin into a belt shape. In this way, by adjusting the tightening strength by the variable-length belt-like member as the fixture 50 to increase the restraining force of the heat insulating box body 100, it is possible to prevent the adjacent panels from shifting and creating a gap at the joint, and it becomes easier to improve the sealing performance of the joint between the adjacent panels. As a result, it becomes easier to further improve the heat insulating performance of the heat insulating box body 100.

[0067] Alternatively, the fixture 50 may be an adhesive strip member configured to be attachable so as to cover the joints between adjacent panels of the heat insulation box body 100. For example, the fixture 50 may be an adhesive tape 50B as shown in FIG. 11. The adhesive tape 50B can be attached to each side of the entire circumference of the heat insulation box body 100 so as to cover the joints between adjacent panels in a state where a plurality of panels 10 are assembled into a three-dimensional shape (here, a box shape). The material of the adhesive tape 50B is not particularly limited, but in light of various conditions such as sealing performance, peelability, and the number of uses, a known adhesive tape in the art such as a vinyl tape, a gum tape, a masking tape, or a curing tape having a desired peelability can be used. In this way, by adjusting the peelability of the adhesive strip member as the fixture 50 to provide a desired adhesive force to the heat insulation box body 100 as the adherend, it is possible to prevent adjacent panels from shifting and creating gaps at the joints, and it becomes easier to enhance the airtightness of the heat insulation box body 100. As a result, it becomes easier to further improve the heat insulation performance of the heat insulation box body 100.

[0068] Alternatively, the fixture 50 may be a container for housing the heat insulation box body 100. The inner dimensions of the container are preferably set so as to support the panel bottom surface 15, which is the side surface facing the side surface (panel upper surface 13) on the heat insulation space S side of each panel, when a plurality of panels 10 assembled into a three-dimensional shape (here, a box shape) are housed. For example, the fixture 50 may be a cardboard box 50C as shown in FIG. 12. For the sake of illustration, FIG. 12 shows a state where the upper surface of the cardboard box 50C is open. The inner dimensions of the cardboard box 50C are set so as to support the panel bottom surface 15 (the outer surface of the heat insulation box body 100) of each panel when a plurality of panels 10 assembled into a three-dimensional shape (here, a box shape) are housed. The gap between the outer surface of the heat insulation box body 100 and the inner surface of the container can be minimized, and the restraining force of the heat insulation box body 100 by the fixture 50 can be enhanced. As a result, it becomes easier to further improve the heat insulation performance of the heat insulation box body 100. Furthermore, in this example, since the outer surface of the heat insulation box body 100 is less likely to be directly exposed to the external environment, it also becomes easier to ensure puncture resistance and impact resistance according to the above-described logistics conditions.

[0069] [Second Embodiment] Referring to FIG. 13A, the heat insulation box body 400 according to the second embodiment of the present disclosure includes a plurality of panels 40 and a fixture 50D. The fixture 50 in this embodiment may be a member that fixes the corner portion (corner portion) of the heat insulation box body 400. For example, it may be a fixture such as a screw, a latch, a tacker, a magnet, etc., a corner cap-shaped fixture shown in FIG. 13B, or a combination thereof. For the convenience of illustration, FIG. 13A shows a state in which the fixture 50D of the panel 40 corresponding to the upper surface of the heat insulation box body 400 is removed. As an example, the heat insulation box body 400 of this embodiment is obtained by supporting a plurality of panels 40 assembled in a three-dimensional shape from three directions with a fixture 50D as shown in FIG. 13B and fixing the corner portions. The plurality of panels 40 assembled in a three-dimensional shape correspond to the upper surface, side surface, and bottom surface of the heat insulation box body 400. In this embodiment, as a second modification, a plate-shaped panel 40 whose side surface is perpendicular to the upper surface and the bottom surface of the panel (the cross-section in side view is a rectangular shape) is used, but the panel shape is not limited to this. For example, similar to the first embodiment, a panel 40 whose side surface is inclined with respect to the upper surface and the bottom surface of the panel and whose cross-section in side view is a trapezoidal shape may be used.

[0070] The fixture 50D of the present embodiment has the function of enhancing the stability of the three-dimensional shape of the heat insulation box body 400 by fixing the corner portions (corner parts) of the heat insulation box body 400, preventing gaps from forming at the joints between adjacent panels 40, and enhancing the airtightness of the heat insulation box body 400. The fixture 50D may be a corner cap in which at least three planar members 51A, 51B, 51C are integrally formed continuously at right angles to each other as shown in FIG. 13B. Each planar member is made of metal, plastic, or the like. The fixture 50D in FIG. 13B is preferably configured to support the panel 40 from three directions at each corner portion in a state where a plurality of panels 40 are assembled into a three-dimensional shape (here, a box shape) and fix each corner portion of the heat insulation box body 400. For example, the fixture 50D may be provided with an adhesive or an adhesive agent inside to fix each corner portion of the heat insulation box body 400. Alternatively, the fixture 50D may have a structure in which a corner cap is placed over the corner portion of the panel 40 covering the screw holes provided at each corner portion of the panel 40, a screw is inserted, and each panel surface and the fixture 50D are screwed together to fix each corner portion. Alternatively, the planar members 51A, 51B, 51C of the fixture 50D are formed of a metal such as iron, and each corner portion of the heat insulation box body 400 may be fixed by the magnetic force with a magnet disposed inside the heat insulation box body 400 or a magnet embedded in each corner portion of each panel 40. Thereby, the stability of the three-dimensional shape of the heat insulation box body 400 is enhanced, it is possible to prevent adjacent panels from shifting and gaps from forming at the joints, and it becomes easier to enhance the airtightness of the heat insulation box body 400. As a result, it becomes easier to further improve the heat insulation performance of the heat insulation box body 400. The corner cap is preferably configured to cover the joints between the panels orthogonal to each other at each corner portion of the heat insulation box body 400 and support each corner portion in a state where a plurality of panels 40 are assembled into a three-dimensional shape. In addition, although the recess 46 is formed in each panel 40 in the present embodiment, the recess 46 is not essential. Further, the corner cap and each corner portion may be fixed with a tacker or the like.

[0071] FIG. 14 shows a panel 40 which is a second modified example of the panel 10 constituting the heat insulation box body 400. As shown in FIG. 14, each panel 40 preferably has recesses 46 of a predetermined depth at the respective corners of the panel bottom surface 45. The depth of the recess 46 is not particularly limited, but from the viewpoint of miniaturization of the heat insulation box body 400, it is preferably equal to the thicknesses of the planar members 51A, 51B, and 51C. In this case, as shown in FIG. 13A, the fixture 50D (corner cap) covers the joints between the panels that are orthogonal to each other at each corner of the heat insulation box body 400 in a state where a plurality of panels 40 are assembled into a three-dimensional shape (here, a box shape), and is configured to support the panel 40 from three directions at each corner. For example, the fixture 50D (corner cap) can be configured to be fitted into the recesses 46A, 46B, and 46C provided on the panel bottom surface 45A of the panel 40A, the panel bottom surface 45B of the panel 40B, and the panel bottom surface 45C of the panel 40C, respectively, so as to cover the joint between the panel 40A, the panel 40B, and the panel 40C.

[0072] In this way, by fixing the corner cap as the fixture 50 to each corner of the heat insulation box body 400, the stability of the three-dimensional shape of the heat insulation box body 100 is enhanced, the adjacent panels are prevented from shifting to form a gap at the joint, and the airtightness of the heat insulation box body 400 is easily enhanced. As a result, the heat insulation performance of the heat insulation box body 100 is more easily improved. Note that FIG. 13A shows an example in which the fixture 50D is applied to a heat insulation box body composed of the panel 40 of the second modified example, but the fixture 50D is also applicable to a heat insulation box body composed of other panels shown in FIGS. 2 to 8.

[0073] In the heat insulation box body 400 according to the second embodiment, the configurations other than the plurality of panels 40 and the fixture 50D are the same as those in the first embodiment, and thus the description thereof is omitted.

Example

[0074] <Fabrication of Heat Insulation Box Body> The heat-insulating box body was fabricated according to the following procedure. As the foam, a PSPE bead foam made by JSP was used. As the vacuum insulating material, “VIP-A (registered trademark)” (320 mm × 320 mm × 10 mm) made by Asahi Fiber Glass was used.

[0075] First, the vacuum insulating material was placed inside the mold, and the foamed structure of the PSPE bead foam was expanded within the restraint body. While applying pressure from both sides in the thickness direction of the vacuum insulating material so that the expanding foamed structures were integrated, the foamed structures were fused to each other and cured. As a result, a composite panel structure with the vacuum insulating material embedded in the foam was fabricated as a panel.

[0076] Then, the forming process was carried out so that the cross-section of the panel in side view had a trapezoidal shape where the angles formed by the base and each hypotenuse were equal to each other. The dimensions of each panel were: width of the inner surface of the panel 300 mm × width of the outer surface of the panel 380 mm, thickness 40 mm, and the angle formed by the base and each hypotenuse was 45°. The minimum distance (i.e., surface distance) between the bottom surface and side surface of each panel and the vacuum insulating material was 10 mm. As variations of the panel, two levels were prepared: a panel without a groove on the side surface of the panel (hereinafter also referred to as “groove-free panel”), and a panel with a groove on the side surface of the panel (hereinafter also referred to as “panel with groove”). Six panels of the same dimensions obtained in this way were prepared and assembled into a box shape of a regular hexahedron to fabricate the heat-insulating box body. The dimensions of the heat-insulating box body itself were: inner dimensions 300 mm × 300 mm, outer dimensions 380 mm × 380 mm.

[0077] <Heat Insulation Performance Test> The fixing method of the heat insulating box was variously changed (Comparative Example 1, Examples 1 to 4), and the temperature change inside each heat insulating box (heat insulating space) was measured by the following procedure. First, the panel corresponding to the upper surface of the heat insulating box was removed, and one - 16°C type latent heat storage material (LOGOS - made PCM, sub - zero pack GT - 16°C hard, 1200 g) pre - cooled at - 20°C was placed at the center of the bottom surface inside the heat insulating box. Next, the temperature - measuring part of the thermometer was suspended with tape from four directions starting from the center positions of the four panels that define the inner surface of the heat insulating box, and was arranged at the center position of the heat insulating space. The temperature measured at this position was taken as the temperature inside the heat insulating box. Then, the removed panel was fitted back to its original position, the heat insulating container was sealed, and it was placed in a constant - temperature bath set at - 10°C and pre - cooled for 2 hours. Immediately after this, the set temperature of the constant - temperature bath was changed to 30°C, and the temperature rise was started.

[0078] <Heat insulation performance evaluation> After the start of the above - mentioned temperature rise, the temperature inside the constant - temperature bath and the temperature inside the heat insulating box were measured at 5 - minute intervals. The temperature measurement was continued until the temperature inside the constant - temperature bath and the temperature inside the heat insulating box became the same, and the heat insulation performance was evaluated by the arrival time (hereinafter, also referred to as the "30°C arrival time") until both reached the same temperature (here, 30°C).

[0079] [Comparative Example] As a comparative example, a heat insulating box assembled in a box shape from groove - less panels was maintained in a self - standing state without using fixtures. For the sake of preventing the collapse of the three - dimensional shape during the experiment, only the four corners of the upper surface of the heat insulating box were temporarily fixed (dotted) with tape.

[0080] [Example 1] As fixtures, a stopper for packing band (TRUSCO - made PP band stopper, width 16 mm) and a packing band (TRUSCO - made hand - tightening PP band, width 15.5 mm) were used. The heat insulating box was fixed by restraining the heat insulating box with a total of four packing bands, two horizontal and two vertical, along each side surface of the heat insulating box assembled in a box shape from groove - less panels.

[0081] [Example 2] As a fixture, an adhesive tape (DiaTex's Pyolan (trademark) tape for painting and construction curing, Y-09-CL, width 25 mm) was used. The heat insulation box body with seamless panels assembled into a box shape was fixed by attaching the adhesive tape to each side of the entire circumference so as to cover the entire joint between adjacent panels.

[0082] [Example 3] As a fixture, a cardboard box (Kobashi's K6W cardboard, 380 mm × 380 mm × 380 mm) was used. After pushing six seamless panels into the cardboard box and assembling them into a box shape, the lid of the cardboard box was closed and sealed with gum tape to fix the heat insulation box body.

[0083] [Example 4] In the same manner as in Example 3 except that the panel with grooves was used, a cardboard box was used as a fixture to fix the heat insulation box body. The depth of the groove portion of each panel with grooves was 1 mm. An ethylene propylene diene rubber (EPDM) foam sealing material (Nitto Ept Sealer's No. 686), which is a sheet-like cushioning material, was attached to the entire bottom surface of the groove portion.

[0084] Each measurement result was summarized in Table 1. Also, based on the results in Table 1, a graph showing the relationship between the temperature inside each heat insulation box body (heat insulation space) and the elapsed time is shown in Fig. 15.

[0085]

Table 1

[0086] As is clear from Table 1 and Fig. 15, in the comparative example without using a fixture, the airtightness of the heat insulation box body was low, and air flowed into the inside, so that the rise in the temperature of the heat insulation space due to the rise in the external temperature could not be effectively suppressed, and the intended heat insulation performance could not be obtained.

[0087] On the other hand, in all the examples of the present disclosure using fixtures, the time to reach 30°C was 1.4 to 3.5 times longer than that of the comparative examples, and excellent heat insulation performance was obtained. In particular, in Example 2, since the inflow of air could be effectively suppressed by fixing the heat insulation box body with an adhesive tape, higher airtightness was achieved compared to Example 1 using a packing band, and a certain cold storage effect was maintained for a long time. In addition, in Example 3 using a cardboard box, since the contact between the panels became stronger, higher airtightness was achieved compared to Example 2, and a certain cold storage effect was maintained for an even longer time. Furthermore, in Example 4 using a panel with grooves in addition to fixing with a cardboard box, higher airtightness was achieved compared to Example 3, and the highest heat insulation performance was obtained. Regarding Example 4, further improvement in heat insulation performance is expected depending on the selection of cushioning materials and the like.

Industrial Applicability

[0088] The heat insulation box body according to the embodiments of the present disclosure can be used in the same applications as conventional heat insulation containers, for example, in general fields where heat insulation materials are used, such as the logistics field for transporting and storing various items such as food, precision instruments, and pharmaceuticals. In particular, the heat insulation box body according to the embodiments of the present disclosure can maintain excellent heat insulation performance by using a predetermined fixture without a frame structure such as a metal support part, and thus can be suitably used for heat insulation boxes transported at low temperatures, refrigerated and frozen containers, etc. In addition, since the heat insulation box body according to the embodiments of the present disclosure is easy to assemble and disassemble, it has industrial utility also in terms of being able to easily improve transportation efficiency and the like even in an environment where logistics conditions such as the cargo hold volume of a transport vehicle are severely restricted.

Explanation of Reference Numerals

[0089] 100 Heat insulation box body 10 Panel 11 Foam 12 Vacuum heat insulation material 13 Panel upper surface 14 Panel side surface 15 Panel bottom surface 20 First modification example of panel 23 Panel upper surface 24 Panel side surface Bottom surface of the 25 panels 26 Groove part 27 Buffer material 400 Heat insulation box body Second modification example of the 40 panel Panels 40A, 40B, 40C Bottom surfaces of the 45A, 45B, 45C panels Recesses 46A, 46B, 46C 50 Fixture 50A Strapping band for packaging 50B Adhesive tape 50C Cardboard box 50D Corner cap Flat members 51A, 51B, 51C Lengths of the sides of the bottom surfaces of the L1, L2 panels Length of the longitudinal direction of the L3 vacuum heat insulation material R Angle S Heat insulation space W1 Thickness of the panel W2 Thickness of the vacuum heat insulation material W3 Width from the upper surface of the panel to the groove part W4 Width of the groove part

Claims

1. A heat-insulating box body, each panel includes a foam and a vacuum heat-insulating material embedded in the foam, and a plurality of panels configured to form a heat-insulating space, which is a closed space, by being assembled into a three-dimensional shape; a fixture configured to generate a contact pressure on the contact surfaces between adjacent panels to fix the plurality of panels in a state where the plurality of panels are assembled into the three-dimensional shape; The heat-insulating box body is characterized by comprising the above.

2. The heat-insulating box body according to Claim 1, each panel has a trapezoidal shape in a side view cross-section, where the angles formed by the base and each hypotenuse are equal to each other.

3. The heat-insulating box body according to Claim 1 or 2, a groove portion linearly extending in a direction orthogonal to the thickness direction of each panel is formed on the contact surface of each panel, and a buffer material is filled in at least a part of the groove portion.

4. The heat-insulating box body according to Claim 1 or 2, the vacuum heat-insulating materials are embedded in the foam such that their positions in the thickness direction of each panel are equal to each other, and the distance between the vacuum heat-insulating materials is minimized when the plurality of panels are assembled into the three-dimensional shape.

5. The heat-insulating box body according to Claim 1 or 2, the material of the foam is any one of polystyrene resin, polystyrene-polyolefin composite resin, and polypropylene resin.

6. The heat-insulating box body according to Claim 1, the fixture is detachably installed with respect to the heat-insulating box body.

7. The heat-insulating box body according to Claim 6, the fixture is a variable-length belt-like member configured to be able to adjust the tightening strength applied to the heat-insulating box body.

8. The heat-insulating box body according to Claim 6, the fixture is an adhesive belt-like member configured to be able to be attached so as to cover the joint between the adjacent panels.

9. The heat-insulating box body according to Claim 6, the fixture is a container for housing the heat-insulating box body, the inner dimension of the container is set to support the panel bottom surface, which is the side surface facing the side surface of each panel on the heat-insulating space side of each panel, when the plurality of panels assembled into the three-dimensional shape are housed.

10. The heat-insulating box body according to Claim 6, the fixture is configured to fix each corner portion of the heat-insulating box body in a state where the plurality of panels are assembled into the three-dimensional shape.

11. The heat-insulating box body according to claim 10, wherein the fixture is a corner cap integrally formed by continuously connecting at least three planar members at right angles to each other, and in a state where the plurality of panels are assembled into the three-dimensional shape, it covers the joints between the panels orthogonal to each other at each corner of the heat-insulating box body, and is configured to support the panels from three directions at each corner, the heat-insulating box body.

12. The heat-insulating box body according to claim 11, wherein each panel is provided with a recess having a depth equal to the thickness of the planar member at each corner, the heat-insulating box body.

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