JP2009222098A - Vacuum heat insulating material - Google Patents

Abstract

Provided is a vacuum heat insulating material having a long life and high durability in which the heat insulating performance of the vacuum heat insulating material is maintained over a long period of time.
A vacuum heat insulating material including a core material portion, the vacuum heat insulating material including a first outer packaging material capable of storing the core material portion and maintaining the inside in a reduced pressure state, and the vacuum heat insulating material are stored. And a second outer packaging material capable of maintaining the inside in a reduced pressure state, and the first outer packaging material and the second outer packaging material are formed of different materials. .
[Selection] Figure 1

Description

  The present invention relates to a vacuum heat insulating material using a metal outer packaging material.

  Conventionally, in order to increase the heat resistance of a heat insulating material, a vacuum heat insulating material using a metal material such as a stainless steel plate as an outer packaging material has been devised (for example, see Patent Document 1).

In order to improve the workability of the heat insulating material, a vacuum heat insulating material using a resin material laminated with an aluminum foil as an outer packaging material instead of a metal has been devised (for example, see Patent Document 2).
Japanese Patent Laid-Open No. 1-150098 JP-A-7-113494

  However, even when a metal outer packaging material is used or a resin outer packaging material is used, it is necessary to join and seal the outer packaging materials in order to create a vacuum. And since a resin seal that is easy to process is used for sealing, even if there is no defect in the sealing part of the outer packaging material, air gradually enters from the sealing part over time, and the pressure rises (that is, vacuum) There was a problem.

  When the degree of vacuum decreases in this way, the heat insulating performance decreases, and it becomes necessary to replace the vacuum heat insulating material itself after a certain period, for example, several years later. Therefore, it could not be used for applications that require a long life, or for applications that are sealed inside products. In addition, since the heat resistance temperature of the resin seal is low, there is a problem that the heat resistance is poor.

  Further, when the resin made by laminating the above aluminum foil is used, the outer packaging material may be damaged. For example, the outer packaging material is torn due to friction during use, and when it is used for friction with uneven parts such as crests or for building materials such as walls, a hole is opened by striking such as nailing. Damage to the outer packaging material may occur. Therefore, there has been a problem that the reduced pressure state cannot be maintained for a long time.

  The present invention has been made in view of the above-mentioned points, and the object of the present invention is to provide a vacuum insulation material with long life and high durability in which the heat insulation performance of the vacuum insulation material is maintained over a long period of time. Is to provide.

  In order to achieve the above object, in the present invention, the vacuum heat insulating material is constituted by two or more outer packaging materials made of different materials.

Specifically, the vacuum heat insulating material according to the present invention is:
A vacuum heat insulating material including a core part,
A vacuum insulator including a first outer packaging material that houses the core part and can maintain the inside in a reduced pressure state;
A second outer packaging material that houses the vacuum insulator and can maintain the inside in a reduced pressure state, and the first outer packaging material and the second outer packaging material are formed of different materials. It is characterized by.

  As described above, the vacuum heat insulating material according to the present invention includes a core part. The core material part is housed in the first outer packaging material, and a vacuum heat insulating body capable of maintaining the inside in a reduced pressure state is formed. A vacuum heat insulating material is accommodated in the 2nd outer packaging material, and the vacuum heat insulating material which can maintain an inside in a pressure reduction state is formed. The first outer packaging material and the second outer packaging material are formed of different materials.

  Here, the first sealing joint portion is formed so as to circulate around the core portion along the four sides of the two first outer packaging materials facing each other. The sealing region is formed at substantially the center of the first outer packaging material, and the inside of the first outer packaging material can be maintained in a reduced pressure state by the first sealing region. The first sealing joint is formed by welding or the like. By forming the first sealing joint portion, the inside of the first outer packaging material is sealed, and the first sealing region is formed. Since the periphery of the first sealing region is sealed by the first sealing joint, the reduced pressure state can be maintained. And a core material part is accommodated in the approximate center in a 1st sealing area | region, and the vacuum heat insulating body is formed.

  In the present specification, the outer packaging materials (the first outer packaging material, the second outer packaging material, the third outer packaging material, and the like described later) are not a single outer packaging material, but face each other as described above. By forming a sealing joint at a certain distance from the outer edge of the core material portion on the four sides of the outer packaging material of the sheet, a sealing region in which the core material portion is to be stored is formed in the approximate center of the outer packaging material. An area | region says what can maintain an inside in a pressure reduction state. “The inside can be maintained in a reduced pressure state” means that the inside is sealed and the internal pressure can be kept constant, that is, once the reduced pressure state is established, the reduced pressure state can be maintained.

  A second sealing region in which the vacuum insulator is to be accommodated by forming a second sealing joint so as to circulate around the vacuum insulator along the four sides of the two second outer packaging materials facing each other. Is formed at substantially the center of the second outer packaging material, and the inside of the second outer packaging material can be maintained in a reduced pressure state by the second sealing region. The second sealing joint is formed by welding or the like. By forming the second sealing joint portion, the inside of the second outer packaging material is sealed, and a second sealing region is formed. Since the periphery of the second sealing region is sealed by the second sealing joint, the reduced pressure state can be maintained. And a vacuum heat insulating body is accommodated in the approximate center in a 2nd sealing area | region, and the vacuum heat insulating material is formed.

  And in this invention, since the core material part is accommodated in the two or more outer packaging materials of a different material, air enters gradually from a sealing part and a pressure does not rise. Since a low degree of vacuum can be maintained over a long period of time, the heat insulating performance of the vacuum heat insulating material is maintained over a long period of time. Therefore, a long-life vacuum heat insulating material can be provided, and replacement for a long period of time is unnecessary, so that it can be used for applications such as sealing inside a product.

  In addition, since two or more outer packaging materials of different materials are used, the outer packaging material is resistant to friction during use, and the outer packaging material is hardly broken. Therefore, a highly durable vacuum heat insulating material can be provided, and it can be used for applications where wear resistance is required.

  Furthermore, the vacuum heat insulating material according to the present invention preferably includes at least one third outer packaging material that can house the vacuum heat insulating body and maintain the inside in a reduced pressure state inside the second outer packaging material. .

The third outer packaging material may be formed of the same material as either the first outer packaging material or the second outer packaging material.
Then, a third sealing joint is formed so as to circulate around the four sides of the two third outer packaging materials facing each other, thereby forming a third sealing member for housing the vacuum insulating member. A stop region is formed at substantially the center of the third outer packaging material, and the inside of the third outer packaging material can be maintained in a reduced pressure state by the third sealing region. The third sealing joint is formed by welding or the like. By forming the third sealing joint portion, the inside of the third outer packaging material is sealed, and a third sealing region is formed. Since the periphery of the third sealing region is sealed by the third sealing joint, the reduced pressure state can be maintained. And a vacuum heat insulating body is accommodated in the approximate center in a 3rd sealing area | region, and the 2nd vacuum heat insulating body is formed. The second vacuum heat insulating body is housed in the approximate center in the second sealing region described above to form a vacuum heat insulating material.

  Thus, since the vacuum heat insulating material is sealed with three or more outer packaging materials, the life can be further extended.

  It is preferable that the internal pressure of the vacuum heat insulating body according to the present invention is lower than the internal pressure of the vacuum heat insulating material.

  Here, the internal pressure of the vacuum heat insulator is the pressure in the first sealing region. And the internal pressure of a vacuum heat insulating material is a pressure in a 2nd sealing area | region. The internal pressure of the vacuum heat insulator and the internal pressure of the vacuum heat insulating material are lower than the atmospheric pressure, and are maintained in a reduced pressure state. Therefore, when the ambient pressure is atmospheric pressure, the internal pressure of the vacuum heat insulator is lower than the internal pressure of the vacuum heat insulator, and the internal pressure of the vacuum heat insulator is lower than the ambient pressure.

  Thus, since the vacuum heat insulating body is housed in the second sealing region maintained in the reduced pressure state, the reduced pressure state once reached can be better maintained than when the outside is at ambient pressure. it can. Therefore, the internal pressure of the innermost vacuum heat insulating material that accommodates the core part can be further lowered, and the heat insulating performance can be maintained over a long period of time.

  In the vacuum heat insulating material according to the present invention, the second outer packaging material is preferably a metal outer packaging material. Moreover, it is especially preferable that the second outer packaging material is a stainless steel outer packaging material.

  As described above, since the second outer packaging material is a metal outer packaging material, it has wear resistance against friction during use, and the outer packaging material is hardly broken. In particular, it is effective against problems such as tearing due to external factors, pinholes, etc., which are the problems of resin outer packaging materials laminated with aluminum foil, providing a vacuum heat insulating material with excellent strength and high durability. it can.

As for the vacuum heat insulating material which concerns on this invention, it is preferable that the said core material part is an inorganic type core material part.
There is little generation of undesired gas from the core part, and the reduced pressure state of the core part can be better maintained.

In the vacuum heat insulating material according to the present invention, it is preferable that the first outer packaging material is a resin outer packaging material.
In particular, a multilayer resin outer packaging material having a thermoplastic resin layer such as a polyethylene resin as the innermost layer is preferable. This is because vacuum sealing can be easily performed by fusion of the thermoplastic resin, and production can be performed easily and quickly.

  As the performance of the vacuum heat insulating material, it is possible to improve the long life and durability that maintain the heat insulating performance of the vacuum heat insulating material over a long period of time.

  Embodiments of the present invention will be described below with reference to the drawings.

<<<<< Vacuum Insulation Material 100 >>>>
<<< Configuration of Vacuum Insulation Material 100 >>>
FIG. 1 is a perspective view showing a vacuum heat insulating material 100. FIG. 2 is a front view showing the vacuum heat insulating material 100, and FIG. 3 is a cross-sectional view showing the vacuum heat insulating material 100 along the line AA shown in FIG. Note that FIG. 3 shows that there is a gap between adjacent members in order to clearly show the configuration, but in reality, these members are configured to be in close contact with each other. And although the 2nd sealing junction part 150 is also thickened, in fact, it is comprised thinly between the members to closely_contact | adhere. In FIG. 3, for the sake of clarity, the core member 110 is indicated by hatching with a solid line / broken line / broken line / solid line pattern, and the first outer packaging material is hatched with a thick / thin line pattern.

  As shown in FIGS. 1 to 3, the vacuum heat insulating material 100 includes a vacuum heat insulating body 200 and a second outer packaging material 140. The vacuum heat insulating material 100 can be made by housing the vacuum heat insulating body 200 in the second outer packaging material 140 and forming the second sealing joint 150. The vacuum heat insulating body 200 is made by housing the core part 110 (not shown in FIGS. 1 and 2) in the first outer packaging material 120 and forming the first sealing joint part 130. Can do. Details of how to make the vacuum heat insulating material 100 and the vacuum heat insulating body 200 will be described later. In addition, since the 2nd sealing junction part 150 is formed so that it can visually recognize, in FIG.1 and FIG.2, it showed with the continuous line. Moreover, since the vacuum heat insulating body 200 and the internal sealing area | region S are covered with the 2nd outer packaging material 140, it showed with the broken line in FIG.1 and FIG.2. In FIGS. 1 and 2, a state in which the edge 124 is bent along the outer edge of the core member 110 is indicated by a dotted line so that the vacuum heat insulating body 200 can be easily stored.

<< second outer packaging material 140 >>
<Shape of the second outer packaging material 140>
As shown in FIGS. 1 and 2, the second outer packaging material 140 is formed by two sheet-like second outer packaging materials 140 a and 140 b. Hereinafter, the second outer packaging materials 140a and 140b may be simply referred to as the second outer packaging material 140.

  Each of the two second outer packaging materials 140a and 140b has a constant shape of a substantially square having the same size. The shape and size of each of the two second outer packaging materials 140a and 140b may be appropriately determined according to the shape and size of the vacuum heat insulating material 100, the shape and size of the edge 144 described later, and the like.

  As will be described later, the two second outer packaging materials 140a and 140b are overlapped with each other so that the vacuum heat insulating body 200 is sandwiched therebetween and the vacuum heat insulating body 200 is circulated. The vacuum heat insulating material 100 can be made by welding the materials 140a and 140b.

<Material of second outer packaging material 140>
Any material can be used as the second outer packaging material 140 as long as it is a metal that can sufficiently withstand the temperature and pressure of the vacuum heat insulating material 100 and maintain the function as the vacuum heat insulating material 100. Can do. For example, various steel thin plates such as a mild steel thin plate, a stainless steel thin plate, a galvanized steel thin plate, an aluminum alloy thin plate, a titanium thin plate, a tin thin plate, and the like can be used. In particular, it is preferable to use stainless steel, iron, titanium or the like having a plate thickness of about 0.05 mm to 0.5 mm.

  Note that the second outer packaging material 140 may be formed of not only a single layer metal thin plate but also a plurality of layers of metal thin plate. The configuration of the second outer packaging material may be appropriately determined in consideration of the heat resistance, the heat insulating property of the vacuum heat insulating material 100, and the like.

<Second Sealing Joint 150, Second Sealing Area S, Edge 144>
As will be described later, in the vacuum heat insulating material 100, two second outer packaging materials are sandwiched along the outer periphery of the vacuum heat insulating body 200 by sandwiching the vacuum heat insulating body 200 between the two second outer packaging materials 140 a and 140 b. It can be made by welding 140a and 140b. As shown in FIGS. 1 and 2, the second sealing joint 150 can be formed by welding the two second outer packaging materials 140 a and 140 b.

  As shown in FIGS. 1 and 2, the second sealing joint 150 (150 a to 150 d) is formed on the other side facing the one side from the end of one side of the second outer packaging material 140. The second outer packaging material 140 is formed so as to circulate substantially in parallel along another side sandwiched between one side and the other side until reaching the end.

  By forming the second sealing joint 150, the region including the vacuum heat insulator 200 can be accurately sealed. The region including the vacuum heat insulating body 200, that is, the region formed by sandwiching the vacuum heat insulating body 200 between the two second outer packaging materials 140a and 140b is a sealed region. (Refer to FIG. 1). Moreover, the outer edge area | region of the 2nd outer packaging material extended to the 2nd sealing junction part 150 which goes around along the 2nd sealing area | region S is called the edge 144 (refer FIG. 1). In other words, the second sealing joint 150 is formed so as to partition and define the second sealing joint 150 and the edge 144. However, when the outer edge region on the second outer packaging material is sealed so as to be the second sealing joint 150, the edge 144 is not formed.

  As described above, the second sealing joint 150 is formed to circulate around the vacuum heat insulating body 200, and the vacuum heat insulating body 200 is sealed by the second sealing joint 150. That is, the second sealing region 150 maintains the second sealing region S in a reduced pressure state. Since the second sealing region S is a region where the reduced pressure state is maintained, it functions as a vacuum maintaining region. The pressure in the second sealing region S that is the vacuum maintaining region is the internal pressure of the vacuum heat insulating material 100. The internal pressure of the vacuum heat insulating material 100 is preferably 2.5 Pa or less.

  As described above, the second sealing joint 150 is formed so as to go around the second sealing region S and the vacuum heat insulating body 200. In particular, the second sealing joint 150 is preferably formed so as not to overlap with the vacuum heat insulating body 200 and as close to the outer periphery of the vacuum heat insulating body 200 as possible.

  Furthermore, it is preferable that the width of the second sealing joint 150 itself is within 5 mm. However, when it is not preferable in terms of heat insulation efficiency or dimensions, it is particularly preferable to set the thickness to about 0.1 to 3 mm.

  The width of the edge 144 is not particularly limited, but is about 3 to 70 mm, and preferably 10 to 40 mm from the viewpoint of heat insulation efficiency and attachment.

  Note that the edge 144 does not necessarily have to exist on the entire circumference of the vacuum heat insulating material 100.

<<< Configuration of Vacuum Insulator 200 >>>
FIG. 4 is a front view showing an outline of the entire vacuum heat insulating body 200. FIG. 5 is a cross-sectional view showing the configuration of the vacuum heat insulating body 200. In addition, since the 1st sealing junction part 130 is formed so that it can visually recognize, in FIG.4 and FIG.5, it showed with the continuous line. Moreover, since the core part 110 and the 1st sealing area | region I are covered with the 1st outer packaging material 120, in FIG.4 and FIG.5, it showed with the broken line. Note that FIG. 5 shows that there is a gap between adjacent members in order to clearly show the configuration, but actually, these members are configured to be in close contact with each other. In FIG. 5, for the sake of clarity, the core material portion 110 is indicated by hatching with a solid line / broken line / broken line / solid line pattern, and the first outer packaging material is hatched with a thick line / thin line pattern.

<< Core material part 110 >>
<Shape of the core part 110>
As shown in FIG. 4, the core part 110 has a substantially square shape and a substantially thin plate shape. The thickness and size of the core member 110 may be appropriately determined according to the object to be insulated and the required heat insulation performance.

<Material of core part 110>
Although the core material part 110 is not specifically limited, a fiber assembly, an open cell foam, etc. are used. A fiber assembly is preferable from the viewpoint of heat insulation. From the viewpoint of workability, the fiber assembly is preferably used in a substantially plate shape as described above. When the fiber assembly is used as it is in the “wadding state” or in the refined “powdered state”, the handling property of the core material part 110 is deteriorated. The process of storing in the outer packaging material 120 becomes complicated and the workability deteriorates.

  The fiber assembly is composed of inorganic fibers, organic fibers, or a mixture thereof.

  Examples of the inorganic fiber include glass fiber (glass wool), alumina fiber, slag wool fiber, silica fiber, rock wool, and the like.

  Examples of organic fibers include polyester fibers, acrylic fibers, polyethylene fibers, polypropylene fibers, nylon fibers, polyvinyl alcohol fibers, polyurethane fibers, polynosic fibers, rayon fibers, and other synthetic fibers, and natural fibers such as hemp, silk, cotton, and wool. Etc. An inorganic fiber and an organic fiber are used as single fiber which consists of 1 type, or multiple types of mixed fiber.

  In this embodiment, in order to take advantage of the heat resistance of the first outer packaging material 120, the second outer packaging material 140, the third outer packaging material 160, etc., which will be described later, the core material portion 110 is also excellent in heat resistance. A system core part is preferable, and a glass wool core part is particularly preferable in consideration of heat insulation.

<< first outer packaging material 120 >>
<Shape of the first outer packaging material 120>
As shown in FIGS. 4 and 5, the first outer packaging material 120 is formed by two sheet-shaped first outer packaging materials 120 a and 120 b. Hereinafter, the first outer packaging materials 120a and 120b may be simply referred to as the first outer packaging material 120.

  Each of the two first outer packaging materials 120a and 120b has a certain shape of a substantially square having the same size. The shape and size of each of the two first outer packaging materials 120a and 120b may be appropriately determined according to the shape and size of the core member 110, the shape and size of the edge 124 described later, and the like.

  As will be described later, the two first outer packaging materials 120a and 120b are overlapped with each other, the core material portion 110 is sandwiched therebetween, and the core material portion 110 is circulated. The vacuum heat insulating body 200 can be made by welding the materials 120a and 120b.

<Material of first outer packaging material 120>
As the first outer packaging material 120, any metal can be used as long as it can withstand the conditions of the temperature and pressure at which the vacuum heat insulating material 100 is used and can maintain the function as the vacuum heat insulating material 100. Can do. For example, various steel thin plates such as a mild steel thin plate, a stainless steel thin plate, a galvanized steel thin plate, an aluminum alloy thin plate, a titanium thin plate, a tin thin plate, and the like can be used. In particular, it is preferable to use stainless steel, iron, titanium or the like having a plate thickness of about 0.05 mm to 0.5 mm.

  When the first outer packaging material 120 is made of metal, the first outer packaging material 120 may be made of not only a single layer of metal thin plate but also of a plurality of layers of metal thin plate. The configuration of the first outer packaging material 120 may be appropriately determined in consideration of the heat resistance, the heat insulating property of the core member 110, and the like.

  Further, a resin outer packaging material can be used for the first outer packaging material 120. As the resin outer packaging material, any material can be used as long as it has gas barrier properties, can maintain the inside of the outer packaging material in a reduced pressure state, and can be heat sealed, but preferably aluminum foil or aluminum vapor deposition. It is a multilayer resin outer packaging material having a layer structure.

  The resin outer packaging material is, for example, a gas barrier film having a four-layer structure in which nylon, aluminum-deposited PET (polyethylene terephthalate), aluminum foil, and high-density polyethylene are laminated in this order from the outermost layer to the innermost layer, polyethylene terephthalate resin, aluminum Examples thereof include a gas barrier film made of foil, a high-density polyethylene resin, a polyethylene terephthalate resin, an ethylene-vinyl alcohol copolymer resin having an aluminum vapor deposition layer, and a gas barrier film made of a high-density polyethylene resin. In addition, in the said resin outer packaging material of the multilayer structure, it uses so that an innermost layer may comprise a back surface, ie, an innermost layer may comprise the inside of a bag. The resin-made outer packaging material is used by processing a sheet-like or film-like material into a bag shape, for example, a bag shape in which three sides are heat-sealed leaving an opening.

<First Sealing Junction 130, First Sealing Region I, Edge 124>
As will be described later, in the vacuum heat insulating material 100, the core material portion 110 is sandwiched between the two first outer packaging materials 120a and 120b, and the two first outer packaging materials are disposed along the outer periphery of the core material portion 110. It can be made by welding 120a and 120b. As shown in FIGS. 4 and 5, the first sealing joint 130 can be formed by welding the two first outer packaging materials 120 a and 120 b.

  As shown in FIGS. 4 and 5, the first sealing joint 130 (130 a to 130 d) is formed on the other side facing the one side from the end of the one side of the first outer packaging material 120. The first outer packaging material is formed to circulate substantially in parallel along another side sandwiched between one side and the other side until reaching the end. By forming the first sealing joint portion 130 (130a to 130d), the first sealing joint portion 130 is formed to circulate around the core member portion 110, and includes the core member portion 110. It is possible to accurately seal the region. The region including the core member 110, that is, the region formed by sandwiching the core member 110 between the two first outer packaging materials 120a and 120b is a sealed region. Is referred to as a sealing region I (see FIG. 4). Moreover, the outer edge area | region of the 1st outer packaging material extended to the 1st sealing junction part 130 which goes around along the 1st sealing area | region I is called the edge 124 (refer FIG. 4). In other words, the first sealing joint 130 is formed so as to partition and define the first sealing joint 130 and the edge 124. However, when the outer edge region on the first outer packaging material is sealed so as to be the first sealing joint portion 130, the edge 124 is not formed.

  As described above, the first sealing joint 130 is formed so as to go around the core member 110, and the vacuum heat insulating body 200 is sealed by the first sealing joint 130. That is, the first sealing region I is maintained in a reduced pressure state by the first sealing joint 130. Since the first sealing region I is a region where the reduced pressure state is maintained, it functions as a vacuum maintaining region. The pressure in the first sealing region I that is the vacuum maintaining region is the internal pressure of the vacuum heat insulating body 200. The internal pressure of the vacuum heat insulating body 200 is preferably 2.5 Pa or less, which is a value lower than the pressure of the vacuum heat insulating material 100.

  As described above, the first sealing joint 130 is formed so as to go around the first sealing region I and the core member 110. In particular, the first sealing joint 130 is preferably formed so as not to overlap the core member 110 and as close as possible to the outer periphery of the core member 110.

  Furthermore, it is preferable that the width of the first sealing joint 130 itself is about 10 mm. However, when it is not preferable in terms of heat insulation efficiency or dimensions, the width of the first sealing joint 130 can be reduced, for example, within 5 mm.

  The width of the edge 124 is not particularly limited, but is about 3 to 70 mm, and preferably 10 to 40 mm from the viewpoint of productivity. In the case of using a resin outer packaging material, since a resin such as a thermoplastic resin is fused to form a sealed joint portion, it is more preferable that the edge 124 is not formed because the productivity becomes higher. .

  Note that the edge 124 does not necessarily have to exist on the entire circumference of the core part 110.

<< Getter Agent 180 >>
<Function of getter agent 180>
A getter agent 180 (not shown) may be provided in the first outer packaging material 120. After the inside of the first outer packaging material 120 is depressurized and welded, gas, for example, outgas or moisture may be generated from the core material portion 110 inside the first outer packaging material 120, and the degree of vacuum is reduced. there is a possibility. For this reason, it is preferable to store the getter agent 180 capable of adsorbing gas and moisture together with the core part 110 inside the first outer packaging material 120.

  In this way, by storing the getter agent 180 in the first outer packaging material 120, gas and moisture can be absorbed by the getter agent 180, so that the heat insulating effect of the vacuum heat insulating material 100 can be maintained for a longer time. .

<Material of getter agent 180>
The substance capable of adsorbing gas and moisture is not particularly limited, and examples of substances that physically adsorb gas and moisture include activated carbon, silica gel, aluminum oxide, molecular sieve, and zeolite. Also, those that chemically adsorb gas or moisture include, for example, calcium oxide, barium oxide, calcium chloride, magnesium oxide, magnesium chloride, metal powder materials such as iron and zinc, barium-lithium alloys, zirconium There are system alloys.

<< Formation of Vacuum Insulator 200 >>
The vacuum heat insulating body 200 can be made as follows.

  First, two resin-made first outer packaging materials 120a and 120b having substantially the same size are prepared, and these two first outer packaging materials 120a and 120b are arranged so as to approximately overlap each other. It is set as the bag shape sealed by heat-seal | fusing the edge | side. The remaining unsealed side of the first outer packaging material is an open end for accommodating the core material 110 inside the first outer packaging material 120, and after the core material 110 is accommodated and vacuumed The first outer packaging material 120 is sealed by heat sealing. By doing in this way, the vacuum heat insulating body 200 which made the inside the pressure reduction state can be made.

  In the above-described example, the first sealing joint 130 is formed by heat fusion. However, when the material of the outer packaging material is changed, it may be formed by welding, soldering, or brazing. Any material can be used as long as the inside of the vacuum heat insulating body 200, that is, the first sealing region I can be kept in a reduced pressure state to maintain the sealing.

  Thus, the vacuum heat insulation formed by using the core part 110 having a substantially square plate-like shape and the two outer packaging materials 120a and 120b having a substantially square plate-like shape. The body 200 also has a substantially square plate-like shape.

  The vacuum heat insulating body 200 described above refers to a minimum that is sealed by the first sealing joint portion 130 so as to go around the core portion 110. Thus, the core material part 110 should just be sealed so that it may wrap around by the 1st sealing junction part 130, and the number of the core material parts 110 sealed is not ask | required. In the above-described example, the case where the number of sealed core member parts 110 is one is shown. However, even if two or more core member parts 110 are sealed, the first sealed joint portion is used. If it is sealed so as to circulate by 130, the vacuum heat insulating body 200 is configured. And when the edge 124 exists along the 1st sealing junction part 130, the vacuum heat insulating body 200 is good also as the minimum in which the edge 124 around the core material part 110 exists.

<<< Formation of Vacuum Insulation Material 100 >>>
FIG. 6 is a front view showing a process of bending the lip 124 formed on the vacuum heat insulating body 200 in order to be housed in the vacuum heat insulating material 100. FIG. 7 is a sectional view in which a lip 124 formed in the vacuum heat insulating body 200 is bent. In addition, since the core part 110 and the 1st sealing area | region I are covered with the 1st outer packaging material 120, in FIG.6 and FIG.7, it showed with the broken line. In FIG. 6, the first sealing joint 130 is not shown. Further, FIG. 7 shows that there is a gap between adjacent members in order to clearly show the configuration, but actually, these members are configured to be in close contact with each other. In FIG. 7, for the sake of clarity, the core material portion 110 is indicated by hatching with a solid line / broken line / broken line / solid line pattern, and the first outer packaging material is indicated by hatching with a thick / thin line pattern.

  The vacuum insulation body 200 is made by forming the first sealing joint 130 by housing the core part 110 in the approximate center of the first outer packaging material 120 made of resin and heat-sealing. (See FIG. 4). And the edge 124 of the formed vacuum heat insulating body 200 is bend | folded along the outer edge of the core part 110 so that it can accommodate easily (refer FIG. 6 and 7). Next, the vacuum heat insulating material 100 can be made by housing the folded vacuum heat insulating body 200 in the approximate center of the second outer packaging material 140 and forming the second sealing joint 150 by welding (FIG. 1). The part including the sealing joint 130 together with the edge 124 can be bent. In addition, the vacuum heat insulating body 200 can also be made without forming a lip.

<<< Other aspects of vacuum heat insulating material 100 >>>
<< Number of outer packaging materials of the vacuum heat insulating material 100 >>
FIG. 8 is a cross-sectional view showing a configuration of another aspect of the vacuum heat insulating material 100. Note that FIG. 8 shows a gap between adjacent members in order to clearly show the configuration, but actually, these members are configured to be in close contact with each other. And although the 2nd sealing junction part 150 is also thickened, in fact, it is comprised thinly between the members to closely_contact | adhere. In FIG. 8, for the sake of clarity, the core 110 is indicated by hatching with a solid line / broken line / broken line / solid line pattern, and the first outer packaging material is hatched with a thick line / thin line pattern. The outer packaging material of No. 3 is shown with a normal upward slanting line.

  The vacuum heat insulating material 100 may include at least one third outer packaging material 160 that can house the vacuum heat insulating body 200 and maintain the inside in a reduced pressure state inside the second outer packaging material 140. The third outer packaging material 160 is the same as the second outer packaging material 140 described above, and the vacuum heat insulating body 200 can be accommodated in the same manner as the second outer packaging material 140. In this case, the vacuum heat insulating body 200 should be accommodated by forming the third sealing joint 170 so as to go around the vacuum heat insulating body 200 along the four sides of the two third outer packaging materials facing each other. The third sealing region M is formed in the approximate center of the third outer packaging material 160, and the inside of the third outer packaging material 160 can be maintained in a reduced pressure state by the third sealing region M. Since the periphery of the third sealing region M is sealed by the third sealing joint 170, the reduced pressure state can be maintained. And the vacuum heat insulating body 200 is accommodated in the approximate center in the 3rd sealing area | region M, and the 2nd vacuum heat insulating body is formed. This second vacuum heat insulator is housed in the approximate center in the above-described second sealing region M to form a vacuum heat insulating material 100 (see FIG. 8).

<<< Example >>>
By using glass wool as the core material part 110 and sandwiching it between two resin films as the first outer packaging material 120, and heat-sealing so that the inside can be maintained in a reduced pressure state, the first The sealing joint part 140 was formed, and the vacuum heat insulating body 200 was formed. The resin film is composed of a nylon resin protective layer, an aluminum foil layer in the middle, and a high-density polyethylene layer in the innermost layer. The width | variety of the 1st sealing junction part in the vacuum heat insulating body 200 is 10 mm, and the edge is not formed. Moreover, the internal pressure of the vacuum heat insulating body 200 is 1.3 Pa.

  The vacuum insulation body 200 formed in this way is similarly sandwiched between two stainless steel foils having a thickness of 0.08 mm as the second outer packaging material 140, and then welded to form the second sealed joint 150. The vacuum heat insulating material 100 was formed. In addition, the width | variety of the 2nd sealing junction part in the vacuum heat insulating material 100 is 1 mm, and the width | variety of a lip is 30 mm. Moreover, the internal pressure of the vacuum heat insulating material 100 is 1.5 Pa.

  An accelerated life test was performed on the vacuum heat insulating material 100 as an example and the vacuum heat insulating body 200 as a comparative example at 70 ° C., which is a higher temperature than the actual use environment, for 28 days.

  The test was conducted in a 70 ° C. oven with internal air circulated.

  The results are shown in Table 1 and FIG.

  As can be seen from Table 1 and FIG. 9, in the examples, it is expected that the thermal conductivity is kept low, the change is small, and the heat insulation performance is maintained for a long time even after 28 days of the accelerated life test.

  However, in the comparative example, the thermal conductivity is gradually increased and the heat insulation performance is gradually lowered. Therefore, it is expected that the heat insulation performance is not maintained over a long period of time.

1 is a perspective view showing an overall outline of a vacuum heat insulating material 100. FIG. 1 is a front view showing an outline of the entire vacuum heat insulating material 100. FIG. 2 is a cross-sectional view showing a configuration of a vacuum heat insulating material 100. FIG. 2 is a front view showing an outline of the entire vacuum heat insulating body 200. FIG. 2 is a cross-sectional view showing a configuration of a vacuum heat insulating body 200. FIG. FIG. 6 is a front view showing a process of bending a lip 124 formed on the vacuum heat insulating body 200 in order to be housed in the vacuum heat insulating material 100. It is sectional drawing which bent the edge 124 formed in the vacuum heat insulating body 200. FIG. It is sectional drawing which shows the structure of the other aspect of the vacuum heat insulating material. It is a graph which shows a time-dependent change of the heat conductivity of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Vacuum heat insulating material 110 Core material part 120 1st outer packaging material 130, 130a, b, c, d 1st sealing junction part 140 2nd outer packaging material 150, 150a, b, c, d 2nd sealing Joining portion 160 Third outer packaging material 170, 170a, b, c, d Third sealing joining portion 200 Vacuum insulator I First sealing region S Second sealing region M Third sealing region V , I Internal pressure of vacuum insulation V, S Internal pressure of vacuum insulation

Claims (7)

A vacuum heat insulating material including a core part,
A vacuum insulator including a first outer packaging material that houses the core part and can maintain the inside in a reduced pressure state;
A second outer packaging material that houses the vacuum insulator and can maintain the inside in a reduced pressure state, and the first outer packaging material and the second outer packaging material are formed of different materials. Vacuum insulation material characterized by   2. The vacuum heat insulating material according to claim 1, comprising at least one third outer packing material capable of accommodating the vacuum heat insulating body inside the second outer packing material and maintaining the inside in a reduced pressure state.   The vacuum heat insulating material according to claim 1 or 2, wherein an internal pressure of the vacuum heat insulating body is lower than an internal pressure of the vacuum heat insulating material.   The vacuum heat insulating material according to any one of claims 1 to 3, wherein the second outer packaging material is a metal outer packaging material.   The vacuum heat insulating material according to any one of claims 1 to 3, wherein the second outer packaging material is a stainless outer packaging material.   The vacuum heat insulating material of any one of Claims 1-5 whose said core material part is an inorganic type core material part.   The vacuum heat insulating material according to claim 1, wherein the first outer packaging material is a resin outer packaging material.

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