KR20140100411A - Vacuum insulation material and the refrigerator which is applied it - Google Patents

Abstract

Provided is a vacuum insulation material, which suppresses a decline in a gas barrier property of an outer cover material and has an excellent bending ability. The vacuum insulation material (1) includes a pocket-shaped outer cover material (3); a core material (5) stored inside the outer cover material (3); and a bending area (11) that has a first surface and a second surface, wherein multiple grooves extended at an interval are formed on either the first or second surface in the bending area (11), the grooves include a pair of outer grooves (7) formed in the bending area (11) and multiple inner grooves (8) formed in the outer grooves (7), and an interval between each outer groove (7) and the inner grooves (8) adjacent to each outer groove (7) among the inner grooves (8) is greater than an interval between the inner grooves (8).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum insulation material,

TECHNICAL FIELD [0002] The techniques disclosed in this specification relate to a vacuum insulating material, an insulating case using the vacuum insulating material, and a refrigerator.

       Recently, from the viewpoint of environmental protection and resource protection, energy saving of devices is strongly desired. Particularly, in the case of a cold storage device such as a refrigerator, a rice cooker, and a hot water heater, there is a demand for a heat insulating material having an excellent heat insulating performance in order to efficiently use heat and reduce energy consumption.

A vacuum insulation material is known as a heat insulation material excellent in heat insulation property. Patent Document 1 discloses a vacuum insulator in which a core is inserted into a plug and the inside is made into a vacuum and the opening is sealed. The vacuum insulation material is formed with grooves, so that the bending process can be facilitated.

Patent Document 2 also discloses a vacuum insulator having a core surrounded by a sealing member and provided with grooves.

However, the vacuum insulator disclosed in Patent Document 1 can not sufficiently suppress the stretching of the plug body (sheath material) when the heat insulator is bent by the formation of the grooves. In this case, the sheath material is damaged and the gas barrier property is deteriorated, and the desired heat insulating performance can not be obtained.

Although Patent Document 2 discloses that a groove is formed in a vacuum insulator by bending, in the case of bending into an R shape (so-called "R bending"), that is, when the bending region forms a curved surface having a predetermined radius of curvature , The curved surface is not sufficiently followed to cause a lot of wrinkles, and as a result, the heat insulating performance is deteriorated. Further, if the number of grooves is increased in order to suppress the occurrence of wrinkles, the thinner portions are increased, and the heat insulating performance may be deteriorated.

In view of the above problems, it is an object of the present invention to provide a vacuum insulation material excellent in bending formability while suppressing deterioration of the gas barrier property of the casing material and an insulated and refrigerated appliance using the same.

A vacuum insulator according to an embodiment of the present disclosure includes a bag-shaped cladding material having a gas barrier property and a core material accommodated in the cladding material and serving as a spacer, wherein a bending region is formed, A vacuum insulator having a first surface and a second surface facing each other, wherein at least one of the first surface and the second surface in the bending region is formed with a plurality of grooves extending at intervals from each other, Wherein the groove includes a pair of outer grooves formed in the bending region and a plurality of inner grooves formed on the inner side of the pair of outer grooves, and each of the pair of outer grooves, And the interval between the inner grooves adjacent to the outer grooves is larger than the interval between the plurality of inner grooves.

The vacuum insulation material according to the example of the present disclosure is excellent in bending formability while suppressing deterioration of the gas barrier property of the sheathing material.

Fig. 1 (a) is a sectional view showing a vacuum insulator according to a first embodiment of the present disclosure, and Fig. 1 (b) is a plan view of the vacuum insulator seen from above. 1 (c) is a sectional view showing a vacuum insulator according to a modification of the first embodiment.
Fig. 2 (a) is an enlarged sectional view showing a groove portion when the bending region of the vacuum insulator according to the first embodiment covers the outer side of the curved surface region of the inner case of the refrigerator, Fig. 2 Fig. 5 is an enlarged cross-sectional view of the line Ia-Ia schematically showing the shape. Fig. 2 (c) is an enlarged sectional view showing the groove portion in the vacuum insulator according to the reference example.
3 is an enlarged sectional view showing a vacuum insulator according to a modification of the first embodiment.
Fig. 4 is a view showing the relationship between the elongation in the MD and TD directions and the water vapor permeability of the shell material. Fig.
5 is a view showing the relationship between the groove depth and the bending elastic modulus of the vacuum insulator.
6 is a view showing a vacuum insulation material according to the third concrete example of the first embodiment.
Fig. 7 (a) is a perspective view showing a vacuum insulation material in a bent state, and Fig. 7 (b) is a sectional view of the vacuum insulation material.
8 is a cross-sectional view showing a refrigerator according to a second embodiment of the present disclosure, in which a bended vacuum insulator is used.
Fig. 9 is a view showing the relationship between the groove depth and the elongation of the jacket material in the vacuum insulator. Fig.
10 is a cross-sectional view showing a step of forming a plurality of grooves in the vacuum insulator manufacturing method according to the first embodiment.

Embodiments and embodiments according to the present disclosure will be described below. However, the present invention is not limited to the following embodiments.

In the present specification, the "pitch of grooves" means the pitch between grooves and the distance between the centers of adjacent grooves. The ratio of the depth of the groove to the thickness of the vacuum insulator means a value expressed as a percentage (depth of the groove) / (thickness of the vacuum insulator).

(First Embodiment)

- Construction of Vacuum Insulation -

Fig. 1 (a) is a sectional view showing a vacuum insulator according to a first embodiment of the present disclosure, and Fig. 1 (b) is a plan view of the vacuum insulator seen from above. Here, the upper side in FIG. 1 (a) is referred to as "upper side" for convenience. In the following description, the upper surface shown in Fig. 1 (a) is referred to as "upper surface" (first surface) for convenience, and the surface facing the upper surface is referred to as "lower surface (second surface)".

1 (a) and 1 (b), the vacuum insulator 1 of the present embodiment includes a bag-shaped cover member 3, a core member 5 accommodated in the shell member 3 and serving as a spacer, . The inside of the shell material 3 is sealed and substantially in a vacuum state. As a result, a large heat insulating effect can be obtained while reducing the thickness of the heat insulating material such as foamed polyurethane.

The vacuum insulator 1 has a bending region 11 and at least one of the upper surface and the lower surface in the bending region 11 is formed with a plurality of grooves extending at intervals therebetween. That is, a plurality of grooves may be formed on either the upper surface or the lower surface of the bending region 11, but as shown in Figs. 1 (a) and 1 (b) . Here, the bending area 11 indicates an area suitable for bending along the groove, and does not necessarily have to be actually bent. For example, as shown in Fig. 1 (b), the bending area 11 may not be bent and the entire vacuum heat insulator 1 may have a flat plate shape.

The plurality of grooves formed on the upper surface of the bending region 11 include a pair of outer grooves 7 and a plurality of inner grooves 8 formed inside the outer grooves 7. [ The plurality of grooves formed in the lower surface of the bending region 11 include a pair of outer grooves 9 and a plurality of inner grooves 10 formed in the inner side of both outer grooves 9. The plurality of grooves may extend, for example, in parallel. The groove widths and depths of the outer grooves 7 and 9 and the inner grooves 8 and 10 may be the same or different if they are within a predetermined range to be described later.

As shown in Figs. 1 (a) and 1 (b), the distance A between each outer groove 7 and the inner groove 8 adjacent to the outer groove 7 among the plurality of inner grooves 8, Is larger than the interval (a) between the plurality of inner grooves (8). The distance A between each of the outer grooves 9 and the inner grooves 10 adjacent to the outer grooves 9 out of the plurality of inner grooves 10 is equal to the distance A between the inner grooves 10 Is larger than the interval (a). In the figure, the symbol b indicates the distance between the end portions of the adjacent inner grooves 8 and 10, and is preferably 5 mm or more.

As shown in Fig. 1 (c), the groove 8a located outside the plurality of inner grooves 8 and the plurality of grooves 8b located between the two grooves 8a are formed as grooves 8b , The interval between the groove 8a and the adjacent groove 8b is? And the interval between the grooves 8b is?, The relation of?>?> Is satisfied, alpha] may be formed. As described above, the grooves in the outer grooves may be formed to be larger than the grooves in the inner grooves.

When the bending region 11 of the vacuum insulator 1 covers an object having a curved region, the central portion in the circumferential direction of the curved region has a bending radius generally greater than both ends in the circumferential direction (in other words, the starting point and ending point of bending) . According to the above configuration, since the interval between the grooves is small in the region where the bending radius is small and the interval between the grooves is large in the region where the bending radius is large, the number of the grooves is reduced to suppress the deterioration of the heat insulating property, The followability can be improved. As a result, when the bending area 11 is bent along a plurality of grooves, wrinkles and folded marks are not easily generated, and deterioration of the heat insulating performance can be suppressed. In addition, it is possible to suppress the occurrence of pinholes and deterioration of the gas barrier performance due to the expansion of the outer cover material 3.

When a plurality of grooves are formed on both the upper surface and the lower surface of the vacuum insulator 1, it is preferable that a plurality of grooves formed on the respective surfaces are provided so as to face each other. In other words, it is preferable that the whole of the outer groove 7 and the entire outer groove 9 are overlapped as viewed from above the vacuum insulating material 1, and the entire inner groove 8 and the entire inner groove 10 are overlapped. According to this configuration, since the groove depth per face can be reduced as compared with the case where grooves are formed only on one side of the vacuum heat insulating material 1, the elongation of the sheath material 3 is reduced, Can be reduced. In addition, it is possible to make the sum of the groove depth on the upper face side and the groove depth on the lower face side a sufficient value while reducing the damage occurring to the shell material 3, thereby reducing the bending elastic modulus and the bending strength of the bending area 11, The moldability can be improved.

2 (a) is an enlarged sectional view showing a groove portion when the bent region 11 of the vacuum insulator 1 of the present embodiment covers the outside of the curved surface region of the inner case 21 of the refrigerator, and (b Is an enlarged sectional view schematically showing the shapes of the inner groove 8 and the outer groove 7. Fig. 2 (c) is an enlarged sectional view showing the groove portion in the vacuum insulator according to the reference example. 2A shows an example of bending the bending region 11 with the upper surface formed with the outer groove 7 and the inner groove 8 facing inward.

As shown in Fig. 2 (b), the present inventors have found that the minimum value of the groove widths of the plurality of grooves (i.e., the outer grooves 7 and the inner grooves 8) is Xmin (mm) mm), the depth of the plurality of grooves is Y (mm), and the distance between the plurality of inner grooves 8 is a (mm)

Xmin = 0.54Y (1)

0 < (a - 5) = Xmax? A / 2 (2)

It is preferable that both of the above equations are satisfied. The preferable range of the interval (a) is 6? A? 20.

According to this configuration, the closed space 23 can be formed in a plurality of grooves (the inner groove 8 and the outer groove 7) facing the curved surface area of the object to be coated (inner surface 21) in the folded state. Since a gas having a small thermal conductivity such as air exists in the closed space 23, the heat insulating performance in the bending region 11 can be further improved. More specifically, by optimizing the pitch between the grooves, it is possible to realize R bending with a small bending radius in the bending region 11, and mainly by optimizing the groove width, it becomes possible to suppress the convective heat conduction by minimizing the volume of the closed space 23 . Here, "R bending" refers to bending the bending region to have a curved surface.

In this way, in the vacuum insulator 1, when one surface of the upper surface and the lower surface, in which a plurality of grooves are formed, is folded and bent along a plurality of grooves, the plurality of grooves are bent in a bent state, .

On the other hand, when the groove width X is out of the range defined by the formulas 1 and 2, the grooves are collapsed in the bent state as in the reference example shown in FIG. 2 (c) Heat transfer through the ash 3 is increased, and the heat insulating performance of the vacuum heat insulating material 1 is deteriorated.

2 (a) shows an example in which the closed space 23 is formed by the inner groove 8 and the outer groove 7 and the outer surface of the inner case 21, but the present invention is not limited thereto. It is also possible to provide a sheet having good adhesion between the vacuum insulator 1 and the inner case 21 so as to form the closed space 23 by the sheet and the inner groove 8 and the outer groove 7. [ In this case, the vacuum insulator 1 is not attached to the outer surface of the inner case 21 but attached to the inner surface of the outer case 33 or attached to both the inner case 21 and the outer case 33, 21 and the outer case 33, as shown in Fig. When a plurality of grooves are formed on the surface of the vacuum heat insulating material 1 attached to the outer case 33, a closed space may be formed between the plurality of grooves and the outer case 33.

In the vacuum insulator 1 of the present embodiment, the grooves of the plurality of grooves (inner grooves 8, 10 and outer grooves 7, 9) satisfy the above-mentioned equations 1 and 2, 10 mm or less and the depth of these grooves is 0.4 mm or more and 0.85 mm or less when the thickness of the vacuum insulator 1 is 6 mm and the distance between the adjacent outer grooves 7 and the inner grooves 8, And the distance between the outer grooves 9 and the inner grooves 10 is greater than 6 mm and not greater than 50 mm and the distance between the inner grooves 8 and the distance between the inner grooves 10 is not less than 6 mm and not more than 20 mm.

In the vacuum insulator 1 of this embodiment, it is most preferable that the groove width of the plurality of grooves (the inner grooves 8, 10 and the outer grooves 7, 9) is about 2 mm, When the thickness of the heat insulating material 1 is 6 mm, it is 0.6 mm or 0.2 mm per side (about 10% or 3.3% of the thickness of the vacuum insulating material 1) The distance between the outer grooves 7 and the inner grooves 8 adjacent to each other and the distance between the outer grooves 9 and the inner grooves 10 are about 20 mm , The distance between the inner grooves 8 and the distance between the inner grooves 10 is about 10 mm.

It is preferable that the ratio of the depth of the plurality of grooves to the thickness of the vacuum insulator 1 is not less than 12% and not more than 28% of the vacuum insulator 1 as a total of both surfaces. In order to suppress the elongation of the shell material 3, it is preferable that the grooves are formed opposite to each other on both the upper and lower surfaces, and the ratio of the depth of grooves per one surface is 6% or more and 14% or less desirable.

According to this configuration, by setting the ratio of the depth of the grooves to the optimum range, it is possible to improve the bending formability (shape retainability) while minimizing the deterioration of the gas barrier performance and the deterioration of the heat insulating performance of the expanded sheathing material 3 .

Next, constituent materials of the vacuum heat insulating material 1 of the present embodiment will be described.

As the core material 5, powders such as silica powder, alumina powder, and fumed silica, and fibrous bodies such as inorganic fibers and organic fibers may be used singly or in combination. Among these materials, fibrous bodies such as inorganic fibers and organic fibers having flexibility, laminated bodies, and the like are used as core materials (5) for improving heat insulating performance, high followability when used in the sheathing material (3) ). &Lt; / RTI &gt; The envelope material 3 is provided with a gas barrier property in order to maintain a high degree of vacuum in the inside thereof, and is constituted by a laminate film based on a polymer compound such as plastic.

In order to suppress the deterioration of the heat insulating performance caused by the permeation of air or water vapor from the outside into the inside of the vacuum insulating material 1 through the outer skin material 3, the adsorbent 3, together with the core material 5, . The place where the adsorbent is provided is not particularly limited, but it is preferable to avoid the location where the grooves (the outer grooves 7, 9 and the inner grooves 8, 10) are formed. For example, it may be installed and fixed between the lamination sites of the thick vacuum insulator 1, or a plurality of adsorbents may be divided into a plurality of sites. A plurality of kinds of adsorbents may also be used. Further, in the adsorbent storage portion of the core material 5, the core material 5 may be reduced by the thickness of the adsorbent, and the adsorbent may be fixed there. By forming the receiving portion for the adsorbent in this manner, the planarity can be further improved.

Further, as in the case of the vacuum insulator according to the modified example shown in Fig. 3, there is further provided between the sheath material 3 and the core material 5, a suction sheet 47 arranged so as to be in close contact with the sheath material and containing an adsorbent It is possible. In this case, the portion of the core material 5 where the groove is formed may be covered with the adsorbing sheet 47.

According to this configuration, since the suction sheet 47 is used, it is easy to cover the groove portion, and even when a pinhole or the like is generated in the casing member 3 in the groove portion, the suction sheet 47 interposed between the casing member 3 and the core member 5 The outside air entering through the pinhole or the like can be adsorbed by the opening 47. Therefore, the lowering of the degree of vacuum in the vacuum insulator 1 can be suppressed and the long-term reliability of the vacuum insulator 1 can be improved.

Further, even if the adsorption sheet 47 is provided in the groove portion, the thickness of the core 5 is not greatly reduced, so that the heat insulating performance at the insertion portion of the adsorbent is lowered and the bending workability is lowered .

The adsorption sheet 47 may be a resin film in which an adsorbent is dispersed therein. In this case, even if a pinhole occurs at any position of the outer cover 3 (laminated film), it is possible to efficiently absorb the outside air that has entered.

The adsorbent is not particularly limited as long as it can adsorb moisture or gas. Examples of the adsorbent applicable to the vacuum insulator 1 of the present embodiment and modifications thereof include carbon fiber bodies such as synthetic zeolite (hydrophilic or hydrophobic), carbon nanotubes, carbon nanohorns, carbon nanofibers and graphite nanofibers, And a physical adsorbent such as activated carbon or silica gel, which adsorbs the adsorbed molecules and the adsorbent with physicochemical affinity. In addition, a gas adsorbent such as an oxide of an alkaline earth metal (for example, calcium oxide, barium oxide, strontium oxide) including calcium oxide, an oxide of an alkali metal, and a metal oxide may be used. Alternatively, a chemical reaction type adsorbent that realizes adsorption by binding with adsorbed molecules mainly by chemical reaction, such as an alloy of barium-lithium alloy or the like, may be used. A known adsorbent may be used alone or in combination. In addition, the shape is not particularly limited, such as pellets, beads, powders, and the like.

Examples of the fiber used as the core material 5 include inorganic fibers such as glass wool, silica alumina fiber, silica fiber, alumina fiber, ceramic fiber or rock wool, polyethylene terephthalate fiber (PET fiber) Synthetic fibers such as polyester fiber, polystyrene fiber, acrylic fiber, polyethylene fiber, polypropylene fiber, nylon fiber, polyvinyl alcohol fiber, polyurethane fiber and rayon fiber, natural fibers such as cotton, Organic fibers and the like. The fibers may be short fibers or long fibers. The inorganic fibers and the organic fibers may be used singly or in combination.

The sheath material 3 is a laminate film based on a polymer compound such as plastic, and has a constitution in which two to five or more single-layer films are coalesced. The number of the laminated films, the type (material) and the combination of the film are selected so that the laminated film has sufficient gas barrier property to maintain a high degree of vacuum inside the vacuum insulation 1. [

Specifically, the outer cover material 3 is composed of a surface protective layer for preventing a break (vacuum break) in order from the outer layer, a gas barrier layer for imparting gas barrier properties, and a thermal welding layer for sealing. It is preferable that two or more gas barrier layers are provided in order to cope with the occurrence of pinholes or enlargement due to the elongation of the sheath material 3 by the formation of grooves in the vacuum insulating material 1. [ By doing so, even if pinholes are generated in the first gas barrier layer, the second gas barrier layer can suppress the entry of outside air, so that the reliability of the vacuum insulating material 1 can be improved.

Further, in order to reduce the thermal conductivity, it is preferable to employ a vapor-deposited film on at least one layer of the gas barrier layer. As a more preferable structure, at least one layer of the gas barrier layer is preferably an evaporated film, and at least one foil film is employed.

An example of the constitution of the sheath material 3 is as follows: the surface protective layer is made of polyamide (PA), the gas barrier layer is made of polyethylene terephthalate (PET) and aluminum (Al) Lt; / RTI &gt; laminated film.

As a surface protective layer, biaxially oriented polypropylene (OPP) or polyethylene terephthalate having a small hygroscopicity instead of polyamide may be used to improve the heat insulating performance. The heat insulating performance may be improved by using aluminum-deposited ethylene-vinyl alcohol copolymer (EVOH) or aluminum-deposited polyvinyl alcohol (PVOH) instead of aluminum foil in order to reduce the heat bridge as the gas barrier layer. (MDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), unleaded polypropylene (CPP), or polybutylene terephthalate (PBT) may be used instead of high density polyethylene as a thermal welding layer have. The deposition may be metal deposition such as stainless steel deposition (SUS) or inorganic oxide deposition such as silica deposition.

The film thickness can be set considering the adiabatic performance, cost, stretchability, gas barrier property and reliability. Specifically, the thickness of the plastic film (polymer film) is preferably about 10 to 50 占 퐉, the thickness of the aluminum foil is about 6 to 12 占 퐉, the thickness of the vapor deposition film is preferably about 0.04 to 0.12 占 퐉, And the thickness is preferably 60 to 120 탆.

As the lamination method for each layer, a dry laminate in which a film is adhered using a two-liquid curing type urethane adhesive or the like, an extrusion laminate in which a film is adhered using dissolved polyethylene or the like can be selected. The outer surface of the surface protective layer may be subjected to surface treatment such as corona discharge treatment, frame treatment, or plasma treatment. By this surface treatment, the adhesive force between the vacuum insulator 1 and the adhesive or foamed urethane can be improved.

In the shell material 3, the breaking elongation in the first direction and the breaking elongation in the second direction perpendicular to the first direction may be the same or different from each other. Here, in the laminated film constituting the sheath material 3, the first direction may be the film flow direction (MD direction) at the time of film production, and the second direction may be the direction perpendicular to the film flow direction (TD).

The grooves (the inner grooves 8 and 10 and the outer grooves 7 and 9) are formed in two (two) directions when the breaking and drawing of the sheath material 3 is different in the first direction (MD direction) It is preferable that the breaking elongation in the direction extends so as to be orthogonal to the small direction. Here, "orthogonal" with respect to the extending direction of a plurality of grooves means "substantially orthogonal" allowing dimensional errors at the time of manufacture and deformation after manufacturing.

As a result of the examination by the inventors, it can be seen that when the shell material 3 has a small breaking elongation and is bent, the constituent material is not easily increased and the gas barrier performance is not easily deteriorated. This is because generation or expansion of pinholes in the gas barrier layer can be suppressed unless the shell material 3 is easily stretched. Therefore, by having the above-described configuration, it is possible to reduce the damage of the cover material 3 which is elongated by the formation of the groove and the bending, and to suppress the deterioration of the gas barrier performance in the groove portion and the bending region 11 .

The laminate film to be the sheath material 3 may include two or more polymer films having different orientation directions of constituent materials. For example, the laminate film may be composed of a combination of at least one of a monoaxially stretched film, a biaxially stretched film and a non-stretched film. By selecting a combination of degree of stretching of these films, The ratio of the elongation at break is adjusted. At this time, it is also possible to change the direction of the film (for example, vertical and horizontal) in the same orientation direction and to attach them together.

From the viewpoint of suppressing the cracks in the shell material 3 and suppressing the deterioration of the gas barrier performance as the optimum range of the breaking elongation of the laminated film, the ratio of fracture elongation in the small direction by the breaking elongation in the shell material 3 is 40 % Or more and 150% or less. In biaxial stretching, there are sequential stretching in one direction and simultaneous stretching in two directions, but the stretching method including the order is not particularly limited.

The sheathing material 3 is heat-welded, for example, such that the thermally welded layers of the two laminate films are opposed to each other. The thermal welding width of the sheath material 3 is not particularly limited, and a part or all of the edge portion of the sheath material 3 where the core material 5 is not inserted may be welded. However, the preferable range of the thermal welding width is about 10 to 20 mm in order to both suppress the penetration of gas through the end face of the laminated film and to make the edge portion having no heat insulating property as small as possible.

The combination of the two laminate films constituting the outer cover material 3 includes two films including a metal foil (two-side foil specification), two films including a vapor deposition film (two-side deposition specification) and a metal foil And one film (vapor / deposition specification) each containing only a vapor deposition film without including a film and a metal foil.

It is also possible to fold the edge portion where the core member 5 does not exist between the core member 5 and the fold member 3 by overlapping the core member 5 at the position where the core member 5 exists (this folding method is referred to as &Quot;). As the fixing means, an adhesive such as a cellophane tape, a double-sided tape, a hot melt or the like can be used. The folding direction is not particularly limited, and may be either the thin film side or the evaporated film side, or may be the step side (grooved side) or the flat side (the side where the grooves are not formed). When attaching the vacuum heat insulating material 1 to the inner case of the refrigerator or the like, it is preferable that the folding direction is opposite to the attached surface.

As described above, the vacuum insulator 1 according to the present embodiment and the modified example is excellent in shape following property with respect to the object to be coated having a curved surface, and is excellent in bending formability. In addition, The lowering of the gas barrier property of the ash 3 is suppressed. Therefore, according to the vacuum insulator 1 according to the present embodiment and the modified example, since the member having a curved surface can be covered with maintaining a high heat insulating performance, it is possible to prevent the consumed energy Can be saved. In addition, it is possible to improve the capacity ratio of the heat insulating / refrigerating machine.

- Manufacturing Method of Vacuum Insulation -

The vacuum insulator 1 according to the present embodiment is manufactured in the following order.

First, the core member 5 is dried using a drying furnace or the like to remove water or gas adhering to the core member 5, and then the adsorbent is inserted into the core member 5. [ Subsequently, the laminated core material 5 is inserted into the envelope material 3 which has been dried in advance in a drying furnace or a vacuum drying furnace, and three sides are heat-welded to form a bag shape, which is set in a vacuum chamber and evacuated . After reaching an appropriate degree of vacuum, the other side of the sheath material 3 which is not heat-welded is evacuated by heat welding while being vacuum evacuated, and then taken out of the vacuum chamber. As a result, a flat heat insulating material 1 can be obtained.

Subsequently, a plurality of grooves are formed on at least one surface of the upper surface and the lower surface by pressing by a jig or the like. The planar shape of the vacuum insulator 1 before bending may be a rectangular shape as shown in Fig. 1 (b), but is not limited thereto.

- Specific examples of vacuum insulation material -

Specific examples of the vacuum heat insulator and the structural member according to the first embodiment of the present disclosure will be described below. Here, the same reference numerals as those in Figs. 1 (a) and 1 (b) are used for the respective members. In the present specification, the breaking elongation is a value indicating the elongation with respect to the distance between the original point when the sample is pulled and cut (ruptured) while the tensile load is increased, and the elongation is obtained by pulling the sample while pulling the tensile load And the tensile distance to the distance of the origin point is expressed as a percentage.

<First Specific Example>

As a first concrete example, only the material of the outer cover material 3 was prepared and evaluated. The outer cover material 3 was formed by dry lamination of a polyamide film having a thickness of 25 占 퐉, a polyethylene terephthalate film having a thickness of 12 占 퐉 in which aluminum was vapor-deposited to a thickness of about 50 nm, an aluminum foil having a thickness of 6 占 퐉 and a high- Thereby obtaining a laminated film.

Further, the breaking direction of the sheath material 3 was adjusted to 114% in the MD direction and 98% in the TD direction (in accordance with JIS K7127: 1999). The relationship between the elongation in the MD and TD directions and the water vapor transmission rate at this time is shown in Fig. Also, MOCON Aquatran according to ISO15106-3 was used for measurement of water vapor permeability. In the measurement of the water vapor transmission rate, a tensile test was carried out by setting the size of each test piece of the outer cover material 3 to be 100 mm wide and 240 mm long. The test conditions were carried out in accordance with JIS K7127: 1999. In addition, the distance of the original point distance was 100 mm, the test temperature was 23 ° C, and the tensile speed was 2 mm / min.

As shown in Fig. 4, as the elongation percentage increases, the water vapor permeability increases in both the TD and MD directions. Here, since the vapor permeability required to maintain the degree of vacuum in the vacuum insulator is not more than about 2 g / m 2 d, the laminate film of this construction has a water vapor transmission rate exceeding the permissible range, that is, Which is less than the allowable range.

It can also be seen that the breaking permeation degree is small in the TD direction even in the same elongation, the water vapor permeability is smaller than that in the MD direction, and the gas barrier property is high. It has been confirmed from the above that the lowering of the gas barrier property of the outer cover material 3 can be suppressed by making the direction in which the outer cover material 3 is stretched by bending coincided with the smaller direction of the breaking elongation of the outer cover material 3 . As in the present specific example, when the breaking elongation in the TD direction is smaller than the breaking elongation in the MD direction, a vacuum insulation material in which deterioration in gas barrier property is suppressed is obtained by setting the circumferential direction of the bent portion in the sheath member 3 to the TD direction . Contrary to this example, in the case of preparing the jacket material 3 in which the tensile elongation in the MD direction is small relative to the TD direction, the circumferential direction of the bent portion in the jacket material 3 is the MD direction, It is possible to obtain a vacuum insulated material with suppressed deterioration.

&Lt; Second Embodiment &

By the above-described manufacturing method, a flat-plate-shaped vacuum insulator before forming the grooves was produced. The outer cover material 3 was formed by dry lamination of a polyamide film having a thickness of 25 占 퐉, a polyethylene terephthalate film having a thickness of 12 占 퐉 in which aluminum was vapor-deposited to a thickness of about 50 nm, an aluminum foil having a thickness of 6 占 퐉 and a high- Thereby obtaining a laminated film. As the core material (5), a laminate of short fiberglass wool having an average fiber diameter of about 4 탆 was used. In addition, the adsorbent was omitted in consideration of the measurement.

The vacuum insulator 1 according to this embodiment can be manufactured by forming a plurality of grooves after forming the vacuum insulator. That is, an example of the manufacturing process of the vacuum insulator 1 by the manufacturing method described in this embodiment is as follows. Here, FIG. 10 is a cross-sectional view showing a step of forming a plurality of grooves in the vacuum insulator 1 according to the present embodiment (this specific example).

First, as shown in Fig. 10, a vacuum heat insulator 1 is pressed by using a jig 50 having, for example, a plurality of semicylindrical members each having a width of 2.5 mm arranged at predetermined intervals , Grooves are formed on the upper surface (first surface) and the lower surface (second surface) of the vacuum insulating material. Each of the plurality of grooves formed on the lower surface and the grooves formed on the upper surface are opposed to each other. In other words, each of the grooves formed on the lower surface and the plurality of grooves formed on the upper surface are completely overlapped when viewed from the top of the vacuum insulator 1. The grooves are formed at substantially the same positions as viewed in the thickness direction on the upper surface and the lower surface.

In addition, a plurality of grooves are formed at a position where the R bending is performed (the bending area 11), and the plurality of grooves are formed by a pair of outer grooves 7 and 9, And a plurality of inner grooves (8, 10) formed on the inner side of the grooves (7, 9).

The distance between each of the pair of outer grooves 7 and the inner groove 8 adjacent to each of the outer grooves 7 of the plurality of inner grooves 8 is determined by the distance between the plurality of inner grooves 8 Lt; / RTI &gt; The distance between each of the pair of outer grooves 9 and the inner groove 10 adjacent to each outer groove 9 of the plurality of inner grooves 10 is larger than the distance between the plurality of inner grooves 10 Big.

In this specific example, the distance between the inner grooves 8 and 10 is 10 mm, and the distance between the outer grooves 7 and 9 and the inner grooves 8 and 10 adjacent to the outer grooves, respectively, is 20 mm. In addition, the three-point bending test was carried out by setting the size of the vacuum insulator 1 for measuring the flexural modulus of elasticity to 50 mm in width and 120 mm in length. The test conditions were in accordance with JIS K7221. That is, the test piece is provided for the test after being stored for more than 88 hours at 23 DEG C and 50% humidity (according to JIS7100), and the test temperature and humidity = 23 DEG C , 50%, and a bending speed of 10 mm / min.

The results of investigating the relationship between the groove depth and the bending elastic modulus of the vacuum insulator at this time are shown in Fig. 5 also shows the maximum elongation that can occur in the outer cover material 3 at the time of forming the groove. Here, the range in which the water vapor transmission rate shown in FIG. 5 is appropriate is obtained from the result of FIG. 9 is a diagram showing the relationship between the groove depth and the elongation of the jacket material in the vacuum insulator.

It can be seen that, in forming such a groove, the bending elastic modulus decreases as the groove depth increases. In this specific example, it was confirmed from the results shown in Figs. 5 and 9 that the groove depth suitable for bending the vacuum insulator 1 was 0.4 mm or more per side. It was also confirmed that the bending strength also showed a tendency similar to the bending elastic modulus. However, the larger the groove depth, the larger the maximum elongation. As a result, when the groove depth is increased, the gas barrier property is lowered. Taking this into consideration, it is possible to obtain the optimum range of the shell material direction and the groove specification (width, depth) by collating the results of the shell re-stretch ratio, steam permeability and bending elastic modulus. The following is summarized.

1) Sheathing direction: elongation in a small direction (TD direction in this case), elongation 0 to 32%

2) Groove depth of vacuum insulation material (1): 0.4 mm or more and 0.85 mm or less per side (6 to 14% per one surface and 12 to 28%

&Lt; Third Specific Example &

A vacuum insulator 1 having a size of 400 mm in width and 700 mm in length was produced in accordance with the material composition described in the first example and the production process described in the second example. The thickness of the vacuum insulator 1 is about 6 mm, and the intervals of the grooves are as shown in Fig. That is, the groove widths of the plurality of grooves are all 2 mm and the groove depth is 0.5 mm (error is 0.2 mm). In the thus obtained bending area 11 of the vacuum insulation panel 1, the vacuum insulation panel 1 was folded along a plurality of grooves to form an R shape (see Fig. 7 (a)). As a result, it was possible to form the shape of R50 (that is, a bending radius of 50 mm). In this state, it remained for more than 3 days, but no leakage occurred. In addition, when the thermal conductivity was measured by the heat flow method (JIS A 1412-2), the thermal conductivity did not change as compared with that before bending. Further, it was confirmed that even when the size of the vacuum insulator 1 is changed to be larger or smaller, the same processing can be performed.

&Lt; Fourth Embodiment &

The vacuum insulator 1 according to this specific example is obtained by changing the interval of the grooves in the vacuum insulator 1 according to the third specific example. Specifically, the interval between the inner grooves 8, 10 is 7.5 mm, the distance between the outer grooves 7, 9 and the inner grooves 8, 10 adjacent thereto (that is, the distance between the starting point and the ending point of the bending) Groove interval) was set to 15 mm. As a result, it was possible to form the shape of R40 (bending radius 40 mm). In this state, the vacuum insulator 1 was left for 3 days or more, but no leakage occurred.

By such a constitution, it is possible to improve the followability of the shape in the bending region 11 when bending the vacuum insulator 1, so that a desired shape can be obtained without causing a leak. Further, by applying the vacuum heat insulating material 1 to a refrigerator or the like, it is possible to provide the vacuum insulating material 1 in a place where it has been difficult to apply so far, and the coverage area of the vacuum insulating material 1 can be increased, thereby improving energy saving performance.

In this specific example, as shown in Fig. 2 (a), a shape is formed in which a closed space 23 in which air or the like is present between the groove and the object to be coated or the film is formed after bending the vacuum insulator. It is possible to improve the heat insulating performance in the groove portion of the vacuum insulating material 1 because the thermal conductivity of the air is lower than the thermal conductivity of the outer skin material 3 including the gas barrier layer such as the metal foil or the metal vapor deposition film.

3, the adsorption sheet in which the adsorbent is dispersed in the resin film is covered with the grooves of the core member 5 so as to be interposed between the casing member 3 and the core member 5 It is possible. This makes it possible to adsorb outside air entering through the pinhole or the like by the adsorbing sheet 47 even when a pinhole or the like is generated in the outer covering material 3 in the groove portion of the core material 5, It is possible to suppress the lowering of the degree of vacuum and improve the long-term reliability.

(Second Embodiment)

7 (a) is a perspective view showing a vacuum heat insulating material 1 in a bent state, and Fig. 7 (b) is a sectional view of the vacuum insulating material 1. Fig. 8 is a cross-sectional view showing a refrigerator according to a second embodiment of the present disclosure, in which a bending vacuum insulator 1 is used. The vacuum insulating material 1 shown in Figs. 7 (a) and 7 (b) is a vacuum insulating material 1 according to the third concrete example of the first embodiment, and in the vacuum insulating material 1 according to the first embodiment The bending area 11 is bent so as to form a curved surface along a plurality of grooves, and the other part is also bent in conformity with the shape of the object to be coated.

8, the refrigerator according to the present embodiment includes an outer case 33, inner cases 21 and 31 housed in the outer case 33 to form a storage room therein, an outer case 33, And the vacuum insulator 1 shown in Figs. 7 (a) and 7 (b) disposed between the inner case 21 and the inner case 21, respectively. The inner cases 21, 31 and the outer case 33 are all formed with openings at the front. In the example shown in Fig. 8, the storage chamber in the inner case 21 is a freezing chamber 43 in which the refrigeration temperature is set to be a refrigeration temperature, and the storage chamber in the inner case 31 is a refrigeration chamber 45 set to the refrigeration temperature.

An example of closing the openings of the inner case 31 and the drawer type door 37 closing the openings of the inner case 21 and the inner heat insulating material 1 is described as an example of closing the inner cases 21 and 31, The rotary door 35 constitutes the heat insulating housing 40. The outer case 33 is exposed to the outside except for a part, and is connected to the inner case 21, 31 at the front end. A vacuum insulator 27 is disposed between the inner case 31 and the outer case 33 at the back of the refrigerator and a vacuum insulator 25 is provided between the inner case 31 and the outer case 33 at the ceiling portion of the refrigerator. And vacuum insulators (not shown) are also disposed between the inner case 31 and the outer case 33 on both side portions of the refrigerator. The vacuum insulation panels 25 and 27 may be vacuum insulation panels according to the first embodiment or may be flat panel vacuum insulation panels having no grooves.

The refrigerator of the present embodiment is provided with a refrigeration cycle including an expansion urethane 29 and a compressor 41 as well as the heat insulating housing 40, an electric substrate, and an electric wiring ). A part of the refrigerant pipe, a part of the electric wiring, and the vacuum insulating material 1 in the refrigeration cycle are disposed at appropriate places of the space between the outer case 33 and the inner case 21, 31, The space is filled with a foamed urethane (29) or a heat insulating material such as expanded polystyrene. For example, the outer case 33 is made of iron or stainless steel. The inner case 21, 31 is made of an acrylonitrile-butadiene-styrene copolymer (ABS) or the like, Silver or copper, and R134a or R600a may be used as the refrigerant.

The refrigerator of the present embodiment may have a room set at an arbitrary temperature in addition to the refrigerating chamber 45 and the freezing chamber 43. [ Each yarn is partitioned into appropriate insulation panels. Further, a rotary door 35 or a drawer-type door 37 is provided on the front surface of each of the rooms. The door is equipped with a packing for sealing the refrigerator, and the door has adequate heat insulation to prevent heat leakage and prevent condensation. The drawer-type door 37 is equipped with a container for storing food or the like, and the container is pulled out by pulling the door. Each room has a door pocket for storing food or the like in the door part, or a shelf or tray for partitioning the room. Further, the ice maker may be installed in the bowl or the ice dispenser may be provided on the front of the refrigerator.

The refrigeration cycle consists of a compressor 41, a condenser, evaporators 44 and 46, a capillary tube, a dryer, an accumulator, etc., which are connected by piping to constitute a cycle. Basically, the refrigerant circulates in the order of the compressor 41, the condenser, the capillary tube, and the evaporators 44 and 46, and the refrigerant is returned from the evaporators 44 and 46 to the compressor 41. The accumulator is mounted between the evaporators 44 and 46 and the compressor 41 so that the refrigerant in the liquid state flows into the compressor 41 Avoid aspiration.

The compressor (41) and the condenser are installed in the machine room (39) together with the fan for promoting heat radiation, and the evaporators (44, 46) are installed at appropriate positions on the back surface of the refrigerator. The capillary tube may be taken out into the machine room 39 or embedded in the foamed urethane 29. A heat radiating pipe for further radiating the refrigerant is connected between the condenser and the capillary tube. The heat radiating pipe is disposed in contact with the inner surface of the outer casing (33) of the refrigerator or the inside of the partition front surface . The arrangement method is not particularly limited, but it is fixed with aluminum tape or the like for promoting heat radiation. The length and shape of the heat-radiating pipe are not particularly limited as long as the refrigerant can sufficiently radiate heat.

A fan (blower) is provided on each of the evaporators 44 and 46 to circulate the air cooled by the evaporators 44 and 46 to cool the inside of the refrigerator. And the other of the yarns in which the evaporators 44 and 46 are installed may be connected by a duct or the like. In addition, it is also possible to open and close the duct by a damper or the like to adjust the temperature of the room.

The number of the evaporators 44 and 46 is not particularly limited. However, considering the energy saving performance (low power consumption amount), the cost, and the content efficiency as a whole, one in the freezing chamber 43, It is preferable that a total of two refrigerators are provided in the refrigerating chamber 45. This can be achieved by installing a valve or the like in the refrigeration cycle and branching the refrigerant. The size of the evaporator, the number and shape of the fins, the pipe length, and the like are not particularly limited as long as they can set the room temperature to a desired temperature.

The refrigerator is provided with an inlet for injecting urethane, for example, on a bottom surface or a back surface, and a hole for evacuating gas at the time of foaming the urethane is provided in an appropriate portion of the inner case 21, 31. There are no particular limitations on the number and size of holes for injecting gas or gas. However, for example, when urethane foam is provided by providing four injection ports on the back surface of a refrigerator, the filling property is good and the urethane density is easily made uniform. .

In addition, lighting is installed in the upper part of the refrigerator. The type of illumination is not particularly limited, and a fluorescent lamp, a light emitting diode (LED), or the like can be used. In addition, the color of the light is white, blue, orange, etc., all of which can easily see the inside can be possible.

The vacuum insulator 1 disposed in the refrigerator is attached to the inner surface of the outer case 33 and attached to the outer surface of the inner case 21 and 31. The vacuum insulator 1 is disposed between the outer case 33 and the inner case 21, (33) and the inner case (21, 31), or a combination thereof. As the attaching means, an adhesive such as double-sided tape or hot melt, a pressure-sensitive adhesive or the like may be applied. In addition, there are beads, roll coats, bar coats, spirals and the like in the application method of the hot melt, but the adhesive force is sufficient and appropriate means is appropriately selected in the work.

- Example of refrigerator -

Specific examples of the refrigerator according to the second embodiment of the present disclosure will be described below.

<First Specific Example>

As a first concrete example of the refrigerator according to the second embodiment, a refrigerator using the vacuum insulator 1 according to the third concrete example of the first embodiment will be described. This will be described below with reference to Fig.

The refrigerator according to the present embodiment has a refrigerating chamber 45 set as a refrigerating temperature and a freezing chamber 43 set as a freezing temperature and a refrigerating chamber 45 provided on the upper side of the freezing chamber 43. The thickness (wall thickness) between the outer case 33 and the inner case is set such that the freezing chamber 43 is thicker than the refrigerating chamber 45 in order to secure the heat insulating performance, because the temperature difference between the freezing chamber 43 and the outside air is larger than that of the refrigerating chamber 45 .

In consideration of convenience in use, two rotatable doors 35 having a heat insulating property are provided on the front surface of the refrigerating chamber 45 so that the door is opened by a left-right rotation type (French door). A drawer type door 37 having a heat insulating property is provided on the front surface of the freezing chamber 43. Each door is equipped with a packing to seal the refrigerator. There are two evaporators, one on the back of the freezer and one on the back of the refrigerator (45). In the upper portion of the refrigerator compartment 45, the inner case 31 is recessed so as to be mounted with a lighting unit of a light emitting diode (LED).

In such a refrigerator, the vacuum insulator 1 is arranged as follows. In the case of this refrigerator, since the machine room 39 is disposed on the bottom back side of the refrigerator main body, the back side of the inner case 21 is located inside and a curved area having a predetermined bending radius is formed. A part of the outer surface of the outer case 33 is exposed in the machine room 39.

In the refrigerator according to the present embodiment, the vacuum insulator 1 in the shape of Fig. 7 (a) is arranged to shield the heat conduction between the machine room 39 and the freezer compartment 43 as shown in Fig. At this time, the vacuum insulator 1 is attached to the outer surface of the inner case 21 with a double-sided tape or the like according to the shape of the inner case 21 of the refrigerator.

Particularly, by covering the entire portion of the inner case 21 overlapping with the machine room 39 with the vacuum insulator 1 when viewed from above, it is possible to enhance the heat insulation between the machine room which becomes the hottest and the freezer compartment which becomes the lowest temperature. Therefore, the heat insulating performance of the refrigerator can be greatly improved. In addition, by adopting such a heat insulating structure, the thickness of the heat insulating material between the machine room 39 and the freezing chamber 43 can be reduced, and as a result, the content of the refrigerator can be improved.

It is desirable to adopt a heat insulating structure suitable for minimizing the thickness of the heat insulating material in order to maximize the internal volume while maintaining the minimum heat insulating performance. Specifically, it is desirable to reduce the thickness of the vacuum insulating material 1 and to minimize the thickness of the space for flowing the urethane foam . In this specific example, the vacuum insulator 1 having the shape shown in Figs. 7 (a) and 7 (b) was manufactured by bending the vacuum insulator 1 to a thickness of 6 mm and attached to the inner case of the bottom of the refrigerator . In order to secure a minimum path necessary for the urethane flow, urethane foam is performed by setting the minimum thickness of the space between the outer case 33 and the inner case 21, 31 excluding the vacuum insulator 1 to 15 mm Respectively. With this structure, it is possible to suppress the generation of voids (urethane non-insulator) and uniform the urethane density, and the vacuum insulation panel 1 is disposed, so that the heat insulation performance can be secured even if the insulation thickness is reduced.

In fact, when the refrigerator of the prototype product was examined, the vacuum insulator 1 was not peeled but tightly attached to the inner case, and the urethane was filled tightly. As a result, it is possible to obtain a heat insulating structure of a refrigerator capable of maximizing the internal volume while maintaining the minimum heat insulating performance. The optimum range for taking such a heat insulating structure is a vacuum insulator thickness of 5 mm or more and 10 mm or less, and a minimum thickness of foamed urethane of 15 mm or more and 20 mm or less.

Further, by applying the vacuum insulation material 1 to the side surface, the back surface, the ceiling surface, the bottom surface, the door, and the partition, the heat insulating performance can be further improved. In the refrigerator according to the present embodiment, only the vacuum insulation panel 1 according to the first embodiment and its concrete example may be used. Alternatively, a plate-shaped vacuum insulation panel or other known insulation panel may be used in combination. In this way, a refrigerator excellent in heat insulation performance, energy saving performance, and content efficiency can be obtained.

In addition, the vacuum insulator and the refrigerator using the vacuum insulator as described in the above embodiments and specific examples are not limited to the shape of the groove, the number, the constituent material of the member, the shape, the plane shape of the vacuum insulator, And can be suitably changed within a range of

Further, by using the above-mentioned vacuum insulating material and the heat insulating housing having the same in various kinds of insulated and refrigerated appliances such as a hot water tank and a vending machine for drinks and the like, even if the member has a complicated shape such as a curved surface, Therefore, it becomes possible to reduce energy consumption by efficiently using energy.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but variations and modifications may be made without departing from the scope of the present invention. And can be replaced, modified and replaced.

1, 25, 27 Vacuum insulation
3 sheath material
5 core
7, 9 outer groove
8, 10 inner groove
8a, 8b Home
11 Bending area
21, 31 inner case
23 Enclosed spaces
29 Foamed urethane
33 outer case
35 Rotary door
37 Drawer type door
39 Machine room
40 Insulation case body
41 Compressor
43 Freezer
44, 46 Evaporator
45 Refrigerator
47 Adsorption sheet
50 jig

Claims (15)

And a core member to be accommodated in the casing member and serving as a spacer, wherein a bending region is formed, and a vacuum having a first surface and a second surface facing the first surface, In the heat insulating material,
Wherein at least one of the first surface and the second surface in the bending region is formed with a plurality of grooves extending at an interval from each other,
The plurality of grooves include a pair of outer grooves formed in the bending region and a plurality of inner grooves formed in the inner side of the pair of outer grooves,
Wherein an interval between each of the pair of outer grooves and an inner groove adjacent to the outer grooves among the plurality of inner grooves is larger than an interval between the plurality of inner grooves. The method according to claim 1,
(Mm), the maximum value is Xmax (mm), the depth of the plurality of grooves is Y (mm), the distance between the plurality of inner grooves is a (mm ),
Xmin = 0.54Y,
0 < (a - 5) = Xmax? A / 2
Is formed. 3. The method of claim 2,
Wherein the ratio of the depth of the plurality of grooves to the thickness of the vacuum insulator is in a range of 6% or more and 14% or less per side. The method according to claim 1,
Wherein the plurality of grooves are formed on both the first surface and the second surface,
Wherein the plurality of grooves formed on the second surface and the plurality of grooves formed on the first surface face each other. The method according to claim 1,
In the sheathing material, the breaking elongation in the first direction and the breaking elongation in the second direction orthogonal to the first direction are different from each other,
Wherein the plurality of grooves extend so as to be orthogonal to a direction in which fracture elongation is small in the first direction and the second direction. 6. The method of claim 5,
Wherein the outer cover material is a laminate film comprising two or more polymer films having different orientation directions of constituent materials,
The polymer film is formed by laminating at least one film selected from a monoaxially stretched film, a biaxially stretched film and a non-stretched film,
And a breaking elongation in a direction in which fracture elongation is small in the sheathing material is not less than 40% and not more than 150%. The method according to claim 1,
Further comprising an adsorbent sheet which is in close contact with the outer skin material and contains an adsorbent between the outer skin material and the core material,
And a portion of the core material where the plurality of grooves are formed is covered with the adsorption sheet. 8. The method of claim 7,
Wherein the adsorption sheet is a resin film in which the adsorbent is dispersed therein. The method according to claim 1,
Wherein the vacuum insulator has one surface of the first surface and the second surface on which the plurality of grooves are formed is bent along the plurality of grooves,
Wherein a space is formed in the plurality of grooves so as not to contact each other when the curled elastic member is bent. The method according to claim 1,
The groove width of the plurality of grooves is 1 mm or more and 10 mm or less,
The depth of the plurality of grooves is 0.4 mm or more and 0.85 mm or less when the thickness of the vacuum insulator is 6 mm,
Wherein a distance between each of the pair of outer grooves and an inner groove adjacent to each of the plurality of inner grooves is greater than 6 mm and equal to or less than 50 mm,
Wherein a distance between the plurality of inner grooves is 6 mm or more and 20 mm or less. An outer case,
An inner case housed in the outer case,
The heat-insulating case body according to any one of claims 1 to 10, which is disposed between the outer case and the inner case. 12. The method of claim 11,
The inner case has a curved surface area,
Wherein the bending area of the vacuum insulator is bent along the plurality of grooves in a state in which one surface of the first surface and the second surface on which the plurality of grooves are formed faces the curved surface area,
And the bending region of the vacuum insulation material covers an outer side of the curved region. 13. The method of claim 12,
And a closed space is formed in the plurality of grooves facing the curved surface area in a bent state. An insulating case body according to any one of claims 11 to 13,
And a machine room provided with a compressor and disposed outside the outer case,
At least a part of the outer case is exposed to the outside,
The inner case forms a storage chamber inside,
Wherein the vacuum insulator is disposed at least between the machine room and the inner case along the shape of the inner case. 15. The method of claim 14,
Further comprising a foamed urethane filled in a portion of the space between the inner case and the outer case except for the vacuum heat insulator,
The outer case and the inner case all have openings at the front,
The thickness of the vacuum insulator is 5 mm or more and 10 mm or less,
Wherein the thickness of the minimum portion of the foamed urethane is not less than 15 mm and not more than 20 mm,
Wherein the vacuum insulator covers an entire portion of the inner case which overlaps with the machine room when viewed from above.

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