JP2015007450A - Vacuum heat insulation material vacuum-packaged doubly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum heat insulation material that can maintain stable heat insulation performance for a long term without largely impairing heat insulation performance over time, and can be used as a heat insulation material of a structure.SOLUTION: A vacuum heat insulation material 1 vacuum-packaged doubly includes: an internal vacuum heat insulation material 4 comprising a core material 2, and an inner covering material 3 covering the core material 2, formed by decompressing and sealing its inside and having gas barrier performance; and an outer covering material 5 covering the internal vacuum heat insulation material 4, formed by decompressing and sealing its inside and having gas barrier performance. The outer covering material 5 covers the internal vacuum heat insulation material 4 by thermally welding one sheet of a film having gas barrier performance.

Description

  The present invention relates to a vacuum heat insulating material that can maintain stable heat insulating performance for a long period of time and can be used as a heat insulating material for buildings.

As a heat insulating material used for a building, a vacuum heat insulating material in which a core material is covered with a gas barrier outer covering material and the inside is sealed under reduced pressure is known. This vacuum heat insulating material has an initial thermal conductivity of about 0.0020 to 0.0035 W / mK, and is 0.035 to 0.050 W / mK of glass wool, which is another heat insulating material, or 0.005 of hard urethane foam. Compared to 024 W / mK, this is a heat insulating material with a significantly lower thermal conductivity. Moreover, the thermal resistance value calculated by following formula (1) is used as evaluation of heat insulation performance.

Thermal resistance value [m ² · K / W] = Insulation thickness [m] / thermal conductivity [W / mK] (1)

That is, in order to improve the heat insulating performance, it is necessary to increase the thermal resistance value, and it is necessary to increase the thickness of the heat insulating material or decrease the thermal conductivity.
On the other hand, in the case of a heat insulating material used for a building, since the thickness is limited by regulations such as the Building Standard Law, the heat insulating performance is determined by the thermal conductivity of the heat insulating material.
Thus, since the vacuum heat insulating material has a low thermal conductivity compared to other heat insulating materials, if it has the same thickness as other heat insulating materials, it becomes a heat insulating material with excellent heat insulating performance, and the desired heat insulating performance is also achieved. The thickness for ensuring can be made thinner than other heat insulating materials, and the weight of the heat insulating materials can be reduced.

However, the vacuum heat insulating material is difficult to maintain a stable heat insulating performance for a long period of time because air or the like enters from a vacuum sealed location and the degree of vacuum gradually decreases with time. Moreover, since the vacuum state will be impaired as soon as the outer cover material of the vacuum heat insulating material is damaged, the heat insulating performance is inferior.
In particular, thermal insulation materials used in buildings are required to have long-term stable thermal insulation performance to the same extent as the service life required for buildings. Was not enough.

Thus, there is a need for an improved vacuum heat insulating material that can maintain stable heat insulating performance for a long period of time.
Conventionally, as a method of wrapping a core material with a gas barrier outer cover material, a method of sandwiching the core material between two outer cover materials and thermally sealing the peripheral portion 4 while sealing under reduced pressure has been used. For example, Patent Document 1 discloses that the decrease in the degree of vacuum can be suppressed by reducing the number of heat-welded locations from four to three.
As a method of wrapping in three locations for heat welding, a method of bending a single gas barrier jacket material in half and sandwiching a core material inside it, and heat welding the three openings, so-called pillow shape Patent Document 1 describes such a method.

  However, when using a single gas barrier jacket material, if the core material is brittle, the shape of the core material collapses when the inside is decompressed, especially in the corners and heat welded parts, There is a problem that a gap is easily formed between the jacket material and the core material, and gas, water vapor, or the like enters the gap, lowering the degree of vacuum, and increasing the thermal conductivity over time.

  Moreover, as a vacuum heat insulating material which can maintain long-term heat insulating performance, for example, Patent Document 2 discloses a core material inside a bag body in which a first outer bag and a second outer bag are doubled. And a vacuum heat insulating material in which both outer packaging bags are sealed under reduced pressure.

  However, in the vacuum heat insulating material of Patent Document 2, the openings of the first outer bag and the second outer bag are positioned so as to open in the same direction, and the air in both outer bags is evacuated to once. Since both openings are heat-sealed and sealed, the gas and water vapor that penetrated from the outer heat-welded part penetrates from the inner heat-welded part to the inside without lowering the time, and the degree of vacuum is lowered. As a result, the thermal conductivity increases with time, which is insufficient to maintain long-term heat insulation performance.

JP-A-7-269781 Japanese Patent Laid-Open No. 8-082474

  The present invention solves such conventional problems, and provides a vacuum heat insulating material that can maintain stable heat insulating performance for a long period of time and can be used as a heat insulating material for buildings. With the goal.

  In order to solve the above-described problems, the present invention provides an internal vacuum heat insulating material comprising a core material, and an inner cover material having a gas barrier property which is formed by covering the core material and sealing the inside under reduced pressure, and the internal It is made of a jacket material having a gas barrier property that is formed by covering a vacuum heat insulating material and sealing the inside under reduced pressure, and the jacket material is formed by thermally welding a single gas barrier film, whereby the inner vacuum heat insulating material is formed. It is characterized by covering the material.

  In the present invention, the core material is covered with an inner sheath material and an outer sheath material, each inside is vacuum-sealed with a reduced pressure inside, and the outer shell material is a single gas barrier film. Since it is heat-welded and covers the internal vacuum heat insulating material, it can reduce the heat-welded part, which is the entrance of gas and water vapor, and can suppress the decrease in the degree of vacuum. Therefore, stable heat insulation performance can be maintained for a long time.

  In the present invention, a fiber substrate carrying a hygroscopic agent may be attached to the surface of the internal vacuum heat insulating material.

  By using a fiber base material with a moisture absorbent, it is possible to suppress a decrease in the degree of vacuum, and even when sealed under reduced pressure, it becomes difficult to form irregularities due to the moisture absorbent on the surface of the jacket material. Appearance is not impaired.

  In the present invention, the covering material has a four-layer structure, and is preferably formed from a gas barrier film in which a protective layer, a gas barrier layer, a gas barrier resin layer, and a heat welding layer are sequentially laminated from the outside. .

  By forming the jacket material with a gas barrier film having a four-layer structure, vacuum breakage due to physical scratches during handling can be suppressed, and intrusion of gas and water vapor from the film can be further suppressed.

  Moreover, if it is this invention, it is possible to maintain the stable heat insulation performance for a long period of time, Therefore If it uses as a heat insulating material of a building, the heat insulation structure which can maintain long-term heat insulation performance will be obtained.

  Since the present invention is double vacuum-packed, and the outer cover material heat-welds one gas barrier film and covers the internal vacuum heat insulating material, A certain number of heat-welded parts can be reduced, and the decrease in the degree of vacuum can be suppressed, and even if the outer cover material is physically damaged, the inner cover material maintains the vacuum degree of the internal vacuum insulation material. Stable thermal insulation performance can be maintained for a long time without significantly increasing the conductivity.

  In addition, the heat insulating structure using the present invention can maintain a stable heat insulating performance for a long period of time because the vacuum conductivity due to physical scratches can be reduced without significantly increasing the thermal conductivity over time.

It is an embodiment of the present invention and is a perspective view showing a state in which a part of the jacket material and the inner jacket material are omitted. It is sectional drawing which shows the state cut | disconnected by the AA line in FIG. It is sectional drawing which shows the state cut | disconnected by the BB line in FIG. It is a perspective view showing the state where a part of face material of the vacuum heat insulation board incorporating the present invention was omitted. It is explanatory drawing which is one embodiment of this invention, and shows the application to the heat insulation structure of a building. It is a graph which shows the time-dependent change of the thermal conductivity in an Example.

Embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 3, the vacuum heat insulating material 1 that is double-packed in the present invention has a gas barrier property that is formed by covering the core material 2 and the core material 2 and sealing the inside under reduced pressure. An inner vacuum heat insulating material 4 composed of the inner covering material 3 and an outer covering material 5 having a gas barrier property which is formed by covering the inner vacuum heat insulating material 4 and sealing the inside under reduced pressure.

Examples of the core material 2 of the present invention include amorphous silica, dry silica, wet silica having a hydroxyl group on the particle surface, pearlite, and inorganic powders such as a mixture of these powders; open cell polyurethane foam, open cell polystyrene foam, etc. Organic foam powder; inorganic fiber such as glass fiber, glass wool, rock wool, alumina fiber, silica alumina fiber, silica fiber, silicon carbide fiber; polyester fiber, acrylic fiber, polyethylene fiber, polypropylene fiber, nylon fiber, polyvinyl alcohol fiber, Synthetic fibers such as polyurethane fibers and rayon fibers; natural fibers such as cotton, hemp, silk, and wool can be used. In particular, inorganic powder and inorganic fiber are preferable in maintaining long-term heat insulation performance.
Further, these core materials 2 may be mixed with, for example, a binder and thermally molded into a plate shape, or filled into a breathable inner bag and molded into a plate shape.

Further, the internal vacuum heat insulating material 4 may include a moisture absorbent 7 together with the core material 2 as necessary. The hygroscopic agent 7 may be mixed with the core material 2 in advance, or there is a method in which the hygroscopic agent 7 is supported on a fiber base material such as a non-woven fabric and attached to the core material 2 in a thin plate shape. Not.
Examples of the hygroscopic agent 7 include powders of activated carbon, zeolite, dawsonite, hydrotalcite, metal oxides such as calcium chloride, calcium oxide, and magnesium oxide, and metal hydroxides such as calcium hydroxide and magnesium hydroxide.
The hygroscopic agent 7 can maintain the degree of vacuum for a longer period of time and suppress an increase in thermal conductivity by adsorbing the gas that has penetrated into the internal vacuum heat insulating material and mainly water vapor.

Further, the hygroscopic agent 7 may be attached to the surface of the internal vacuum heat insulating material 4.
In this case, if a fiber base material carrying the hygroscopic agent 7 is used, unevenness due to the hygroscopic agent 7 is difficult to be formed on the surface of the outer covering material 5 even when sealed under reduced pressure, and the appearance is not impaired.
As shown in FIGS. 2 and 3, if the hygroscopic agent 7 is disposed at a location near the heat-welded portion 6 ′ of the inner jacket material 3, gas or water vapor that has entered from the heat-welded portion 6 of the outer jacket material 5 can be obtained. Since it is adsorbed before entering from the heat-welded portion 6 'of the inner jacket material, it is easy to suppress an increase in thermal conductivity, which is preferable.

As the inner covering material 3 and the outer covering material 5 of the present invention, a film having gas barrier properties is used.
Specifically, a film in which a gas barrier layer is laminated on the front surface side and a heat-weldable resin layer on the back surface side, or a film in which a protective layer is further laminated on the front surface side can be used.
In particular, it is preferable to provide a protective layer on the jacket material in order to suppress vacuum breakage due to physical scratches during handling.

Examples of the resin layer having heat-welding properties include vinyl chloride resin, low density polyethylene resin, linear low density polyethylene resin, high density polyethylene resin, polyacrylonitrile resin, unstretched polyethylene terephthalate resin, unstretched polypropylene resin, ethylene-vinyl. Alcohol copolymer resins or mixed resins thereof are used.
The thickness of the heat-weldable resin layer is preferably 30 to 50 μm. If the thickness is less than 30 μm, heat welding becomes insufficient, and it becomes difficult to maintain the vacuum state for a long time. On the other hand, when the thickness exceeds 50 μm, gas and water vapor enter from there, and the rate of decrease in the degree of vacuum is increased.
If the width of the thermal welding is 10 mm or more, the vacuum state can be maintained for a long time.

As the gas barrier layer, a metal foil such as aluminum, stainless steel or iron, or a gas barrier layer such as a metal vapor deposited film is used. Moreover, you may laminate | stack the gas barrier resin layer which can prevent inflow of water vapor | steam on the metal foil or the metal vapor-deposited film.
Examples of the metal-deposited film include polyethylene terephthalate resin, ethylene-vinyl alcohol copolymer resin, polyethylene naphthalate resin, nylon resin, polyamide resin, and polyimide resin. Examples of the metal deposition material include aluminum, cobalt, nickel, zinc, copper, silver, or a mixture thereof.
As the gas barrier resin layer, ethylene vinyl alcohol resin, polyvinyl alcohol resin, polyacrylonitrile resin or the like is used.

  Moreover, when using a film in which a gas barrier resin layer is laminated on a metal foil or a metal-deposited film as the gas barrier layer, the film may be used for either the inner covering material 3 or the outer covering material 5. 5 is preferably used.

As the protective layer, a resin having scratch resistance and puncture resistance, such as a stretched product of polyethylene terephthalate resin, nylon resin, or polypropylene resin, is used.
The thickness of the protective layer may be 10 μm or more.

  The method for laminating the gas barrier layer, the heat-weldable resin layer, and the protective layer is not particularly limited as long as it is a conventionally used method such as heat lamination or adhesive lamination.

The internal vacuum heat insulating material 4 of the present invention is manufactured by covering the core material 2 with the inner covering material 3 and sealing the inside under reduced pressure.
Specifically, using a gas barrier film having a three-layer structure of a protective layer, a gas barrier layer, and a heat welding layer, two gas barrier films are stacked so that the heat welding layer side is on the inside, and three of the four sides are stacked. One end portion is thermally welded to form a bag-shaped inner covering material 3, and the remaining end portion is used as an opening. Next, the moisture absorbent 7 is inserted together with the core material 2 from the opening, and the inside of the inner jacket material 3 is evacuated under reduced pressure. After the degree of vacuum reaches 1 Pa or less, the opening is thermally welded and sealed. A vacuum heat insulating material 4 is formed.

The method of forming the inner covering material 3 is not particularly limited, but if the inner covering material 3 is formed by stacking and thermally welding two gas barrier films, the gap between the core material 2 and the inner covering material 3 at the corners. Is preferable because it can be sealed under reduced pressure.
As will be described later, it is possible to use a single gas barrier film. However, depending on the type of the core material 2, the core material 2 is compressed or fragile and can maintain its shape when sealed under reduced pressure. First, since there is a possibility that a gap or a wrinkle is generated in the interior material 3 between the interior material 3 and the core material 2, it is preferable to use two gas barrier films.

It is preferable that the heat welding portion 6 ′ of the internal vacuum heat insulating material 4 be bent so as not to protrude.
This is because, when the outer cover material 5 is covered, if the heat-welded portion 6 'of the internal vacuum heat insulating material 4 protrudes, wrinkles or gaps are likely to occur there, and the heat insulating performance is likely to deteriorate.

The vacuum heat insulating material 1 double-vacuum packaged according to the present invention is manufactured by further covering the internal vacuum heat insulating material 4 with an outer cover material 5 and sealing the inside under reduced pressure. In addition, as a method of covering the internal vacuum heat insulating material 4 with the jacket material 5, it is a feature of the present invention to use a single gas barrier film.
Specifically, as shown in FIGS. 1 to 3, a gas barrier film having a three-layer structure of a protective layer, a gas barrier layer, and a heat welding layer is used, and both ends of one gas barrier film are thermally welded on the inside. It forms into a layer and heat-welds so that it may become a layer, forms the cylindrical jacket material 5, inserts the internal vacuum heat insulating material 4 in the inside, and the said heat weld part does not locate in the edge part of the internal vacuum heat insulating material 4 The openings at the upper and lower ends of the cylindrical jacket material 5 are heat-welded while being reduced in pressure to form a vacuum heat insulating material 1 that is vacuum-packed twice. This wrapping method is called a pillow type, and a similar wrapping method includes a gusset type with a gusset.

  As a method for forming the covering material 5, in addition to the above, one gas barrier film is folded in two so that the heat-welding layer side is inside, and two sides are heat-welded to form a bag-like outer A method for forming the material 5 and then inserting the internal vacuum heat insulating material 4 from the remaining opening and thermally sealing the inside of the outer material 5 while reducing the pressure, or both ends of one gas barrier film. Examples of the method include a method of joining with a belt-like heat-welded film to form a cylindrical jacket material 5, inserting the internal vacuum heat insulating material 4 therein, and thermally welding the remaining opening while reducing the pressure.

As described above, when one gas barrier film is used, there are three heat-welded portions 6 of the double vacuum-packed vacuum heat insulating material 1 obtained, compared to four places using two gas barrier films. Since it can be reduced, gas and water vapor can be prevented from entering from the heat welded portion, and a decrease in the degree of vacuum can be suppressed, so that stable thermal insulation performance can be maintained for a long time without a significant increase in thermal conductivity over time.
In particular, as shown in FIG. 1, if the outer cover material 5 is formed in a cylindrical shape, only the two portions of the heat-welded portion 6 of the vacuum heat insulating material 1 that is obtained by vacuum-packaging in a double layer project. Therefore, when used as a heat insulating material for a building, a plurality of vacuum heat insulating materials can be spread without gaps, which is more preferable.

  Further, when the inside of the inner covering material 3 and the outer covering material 5 is sealed under reduced pressure, the degree of vacuum inside the outer covering material 5 is made higher than the degree of vacuum inside the inner covering material 3 so that the internal vacuum heat insulating material 4 Expansion can be prevented. In particular, the degree of vacuum inside the inner jacket material 3 is preferably 1 Pa or less, and the degree of vacuum inside the outer jacket material 5 is preferably 50 to 1000 Pa.

Further, when the internal vacuum heat insulating material 4 is covered with the outer covering material 5, as shown in FIG. 3, the surface where the heat welding portion 6 ′ of the inner covering material 3 is bent, and the thermal welding portion 6 of the outer covering material 5. It is preferable to arrange the internal vacuum heat insulating material 4 so that and are located on the opposite side.
It is more efficient to maintain the heat insulation performance for a long time when the distance between the heat-welded portion 6 of the outer cover material 5 and the heat-welded portion 6 'of the inner cover material 3 is increased.

Since the vacuum heat insulating material 1 of the present invention is double vacuum packaged, it can maintain stable heat insulation performance for a long period of time and can reduce vacuum breakage due to physical scratches during handling. It can be used as a material.
As the heat insulating material for buildings, the vacuum heat insulating material 1 double-packed in vacuum may be used alone, or it may be used in combination with other heat insulating materials.

  Examples of other heat insulating materials include rigid foams such as rigid polyurethane foam, polystyrene foam and polyphenol foam, and fiber bodies such as glass fiber and rock wool.

FIG. 4 shows a vacuum heat insulating board 15 in which the vacuum heat insulating material 1 and the hard polyurethane foam 16 which are double vacuum packaged according to the present invention are combined.
As a manufacturing method of the vacuum heat insulation board 15, for example, the vacuum heat insulation material 1 of the present invention that has been double-packed in vacuum packaging is placed on the face material, and after the polyurethane foam stock solution is discharged and foamed, Covered with a material, sandwiched in a sandwich shape, compressed to a certain thickness and foamed / cured, or sprayed with a rigid polyurethane foam stock solution between two upper and lower surface materials, sandwiched in a sandwich shape between the upper and lower surface materials Although it is compressed to a thickness, foamed and cured, a concave portion into which the vacuum heat insulating material 1 double-packed in vacuum is placed on the heat insulating board, and a method of attaching the vacuum heat insulating material 1 to this is mentioned. There is no particular limitation.

The polyurethane foam stock solution is a mixture of a polyol component containing a polyol, a foaming agent, a catalyst and the like and a polyisocyanate component. The resulting rigid polyurethane foam 16 has a thickness of 9 to 100 mm and a foam density of 20 to 100 kg, for example. / M ³ can be used.

As the face material 17, one having a thickness of 0.1 to 1.0 mm is used. For example, a plastic film (thickness 15 to 50 μ) and one or more charcoal paper (100 to 300 g / m ² ) are laminated. Uses things such as kraft paper or core paper laminated with metal foil such as aluminum, kraft paper or core paper deposited metal, kraft paper or core paper, polyethylene film, polyester Laminates of plastic films such as films, those made of these plastic films alone, those laminated by combining a plurality of these plastic films, for example, a four-layer structure of polyethylene film, charcoal cal paper, polyethylene film and PET film Can be mentioned.

As a heat insulation structure of a building using the vacuum heat insulating material 1 double-packed in vacuum packaging of the present invention, for example, as shown in FIG. A heat insulating structure 10 filled with the vacuum heat insulating material 1 that is heavily vacuum packaged is exemplified. The vacuum heat insulating material 1 double-vacuum-packed according to the present invention may be filled between frames such as beams, joists, and large draws in addition to pillars.
Moreover, the vacuum insulation board 15 containing the vacuum heat insulating material 1 of the present invention double-packed in vacuum according to the present invention shown in FIG. It can also be used for the outer insulation method.

  Furthermore, in the construction at the site, the vacuum insulation material 1 that is double-packed in vacuum is fixed to a frame such as a pillar, beam, joist, or large drawing, and a stock solution of rigid polyurethane foam is sprayed from above to form a heat insulation structure. May be.

Although the heat insulation structure of the wooden building was described, the double vacuum-packed vacuum heat insulating material of the present invention can also be applied to heat insulation structures such as reinforced concrete houses and apartments.
For example, a heat insulating structure may be formed by spreading a vacuum heat insulating material on a concrete frame without gaps and spraying a hard polyurethane stock solution on the surface thereof. Moreover, you may stick the vacuum heat insulation board 15 which incorporated the vacuum heat insulating material 1 of the present invention shown in FIG.

  Hereinafter, although demonstrated using an Example, this invention is not limited to an Example.

[Example 1, Comparative Example 1]
As a core material, glass wool with an average fiber diameter of 3 μm or less formed in a plate shape is used, and two gas barrier films are stacked so that the inner side becomes a heat-welded layer, and three sides of the periphery are heat-welded to form a bag-shaped inner A base material is formed, a thin-plate nonwoven fabric having a thickness of 0.5 mm carrying a moisture absorbent (zeolite powder) together with a core material is inserted into the inner base material, and the inside is evacuated to a vacuum of 1 Pa or less. Then, the remaining one side was heat-welded to prepare a vacuum heat insulating material (A) having a width of 200 mm, a length of 200 mm, and a thickness of 10 mm, in which the four sides were heat-welded. As the gas barrier film, a non-stretched polypropylene film having a thickness of 30 μm was used as the heat welding layer, a 9 μm thick aluminum foil was used as the gas barrier layer, and a biaxially stretched polypropylene film having a thickness of 25 μm was laminated as the protective layer.
Next, one end of the gas barrier film is heat-welded so that the inner side becomes a heat-welding layer to form a cylindrical outer covering material, and the vacuum heat insulating material (A) is heat-welded inside the outer covering material. Insert the part that is folded and fixed with tape etc. together with a thin non-woven fabric with a thickness of 0.5mm carrying a hygroscopic agent (zeolite powder), and heat weld one of the upper and lower ends of the jacket material After the vacuum is exhausted and the degree of vacuum reaches 100 Pa, the remaining one side is heat-welded, and the three sides are heat-welded and wrapped in a pillow shape. Material (B) was prepared. The gas barrier film in which the covering material is formed is a non-stretched polypropylene having a thickness of 30 μm as a heat-welded layer, an aluminum foil having a thickness of 9 μm as a gas barrier layer, and a polyvinyl alcohol film having a thickness of 12 μm, and a protective layer having a thickness of 25 μm. A four-layer film laminated with a biaxially stretched polypropylene film was used.
The vacuum heat insulating material (A) is Comparative Example 1, and the vacuum heat insulating material (B) is Example 1.

[Comparative Example 2]
Two gas barrier films are overlapped so that the inner side becomes a heat-welded layer, and three sides of the periphery are heat-welded to form a bag-shaped outer covering material, and the vacuum created as described above inside the outer covering material The heat-welded part of the heat insulating material (A), which is bent and fixed with a tape or the like, is inserted together with a thin non-woven fabric having a thickness of 0.5 mm carrying a hygroscopic agent (zeolite powder), and the inside is evacuated to reduce the degree of vacuum. After the temperature reached 100 Pa or less, the remaining one side was thermally welded, and a vacuum heat insulating material (C) that was vacuum-packed in 10 mm thickness that was heat-welded on four sides was created.

  About vacuum heat insulating material (A)-(C), it measured about the time-dependent change of the heat conductivity of the temperature of 70 degreeC. The results are shown in Table 1 and illustrated in FIG. The thermal conductivity is a value measured according to JIS A 1412.

From Table 1 and FIG. 6, it can be seen that Example 1 has a smaller rate of increase in thermal conductivity over time than Comparative Examples 1 and 2.
Further, in Example 1, double vacuum packaging and the outer cover material is formed of a single gas barrier film, so that the decrease in the degree of vacuum is suppressed, and the thermal conductivity significantly increases with time. I never did.

  Since the present invention can maintain stable heat insulation performance for a long period of time by double vacuum packaging, it can be used for a heat insulation structure of a building.

DESCRIPTION OF SYMBOLS 1 Vacuum insulation material vacuum-packed in 2 2 Core material 3 Inner coating material 4 Internal vacuum insulation material 5 Outer coating material 6 Thermal welding part of outer coating material 6 'Thermal welding part of inner coating material 7 Hygroscopic agent 8 Vacuum part DESCRIPTION OF SYMBOLS 10 Thermal insulation structure 11 Column 12 Face material 13 Exterior material 15 Hard heat insulation board 16 Hard polyurethane foam 17 Face material

Claims (4)

An internal vacuum heat insulating material comprising a core material, and an inner jacket material having a gas barrier property which is formed by covering the core material and sealing the inside under reduced pressure;
Covering the internal vacuum heat insulating material, and consisting of a jacket material having a gas barrier property formed by sealing the inside under reduced pressure,
The double-vacuum vacuum-insulated material, wherein the jacket material covers the internal vacuum heat-insulating material by thermally welding one gas barrier film.   The double vacuum packaged vacuum heat insulating material according to claim 1, wherein a fiber base material carrying a hygroscopic agent is attached to a surface of the internal vacuum heat insulating material.   2. The covering material according to claim 1, wherein the covering material has a four-layer structure, and is formed of a gas barrier film in which a protective layer, a gas barrier layer, a gas barrier resin layer, and a heat welding layer are sequentially laminated from the outside. Or the vacuum heat insulating material of the double vacuum packaging of 2. The heat insulation structure of the building characterized by using the vacuum heat insulating material of the double vacuum-packaging of any one of Claims 1-3.