JP2018204731A - Vacuum insulation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum heat insulating material which maintains low thermal conductivity for a long period of time while improving the adsorption performance of moisture at the time of vacuum exhaust and reducing the initial performance. SOLUTION: A core material containing a fiber material, a first adsorbent, and the first first adsorbent are contained in a bag-shaped outer cover material in which films having a gas barrier layer are faced to each other and partially heat-welded to form a bag. In the vacuum heat insulating material in which the second adsorbent having a slower water adsorption rate than the adsorbent is arranged, the first adsorbent is present in a larger amount on the side farther than the side near the opening of the outer cover material. It was. [Selection diagram] Fig. 8

Description

  The present invention relates to a vacuum heat insulating material.

  From the viewpoint of preventing global warming, as a social effort, the use of renewable energy for power generation has been promoted to reduce CO2 emissions. In general households, it is important to suppress power consumption. For example, it is indispensable to reduce power consumption of a refrigerator that is energized all day. Under such circumstances, refrigerators that employ a vacuum heat insulating material as a part of the heat insulating material have become mainstream, improving energy saving performance.

  Vacuum insulation materials used in refrigerators, etc., exhibit high heat insulation performance by making the inside a reduced pressure state, but in order to maintain high heat insulation performance over a long period of time, generally vacuum insulation materials from the outside An adsorbent that adsorbs gas or the like entering the inside is used.

  For example, as shown in Patent Document 1, a core material formed by laminating at least two layers of sheet-like molded bodies made of inorganic fibers, an adsorbent that adsorbs at least moisture, and a jacket material made of a gas barrier film, There is a refrigerator provided with a vacuum heat insulating material that is formed in the above and has an adsorbent sandwiched between layers of a sheet-like molded body made of inorganic fibers. It is disclosed that the adsorbent is quicklime (calcium oxide).

  Moreover, as shown in Patent Document 2, a vacuum heat insulating material using a vacuum maintaining device composed of a pellet made of zeolite covered with a filter part and a desiccant made of calcium oxide covered with an outer packaging material is provided. is there. It is characterized by covering the pellet made of zeolite with a filter made of a film, a moisture adsorbent or the like.

  Moreover, as shown in Patent Document 3, there is a vacuum heat insulating material in which first and second adsorbents having different moisture adsorption rates are arranged adjacent to each other.

Japanese Patent No. 3507776 Japanese Patent No. 4649953 Japanese Patent Laid-Open No. 2006-84833

  Patent Document 1 is characterized in that the adsorbent is sandwiched between layers of the core material without providing a fixing structure such as a recess in the core material, but it is described in which part of the core material the adsorbent is arranged. There is no.

  Moreover, about patent document 2, there is only a cross-sectional arrangement | positioning figure, and the arrangement position of the plane direction of an adsorbent is unclear.

  Also in Patent Document 3, although the positional relationship in the cross-sectional (thickness) direction between the first adsorbent and the second adsorbent is described, the arrangement position in the planar direction is unclear.

  Therefore, an object of the present invention is to provide a vacuum heat insulating material that maintains low thermal conductivity over a long period of time while increasing moisture adsorption performance during vacuum evacuation to reduce initial performance.

  In order to solve the above-described problems, the present invention is directed to a core material including a fiber material, and a first adsorption material, in a jacket material that is partly heat-welded by facing a film having a gas barrier layer. In the vacuum heat insulating material in which the adsorbent and the second adsorbent having a moisture adsorption rate slower than that of the first adsorbent are disposed, the first adsorbent is from a side closer to the opening of the jacket material. Is also present on the far side.

  According to the present invention, even in a portion where the evacuation efficiency is low, that is, in a portion far from the opening of the jacket material, residual moisture that hinders the pressure drop is adsorbed relatively quickly by the first adsorbent having a high adsorption speed. Therefore, the internal pressure of the vacuum heat insulating material can be stabilized relatively quickly. In addition, a slight amount of water vapor entering from the outside during the period of use of the vacuum heat insulating material and moisture desorbed after being adsorbed by the first adsorbent are absorbed by the second adsorbent with a slow adsorption speed, Since it can adsorb | suck continuously, it is possible to suppress the pressure rise inside a vacuum heat insulating material over a long period of time.

It is a front view of the refrigerator in embodiment of this invention. It is a longitudinal cross-sectional view (AA cross section of FIG. 1) of the refrigerator in embodiment of this invention. FIG. 3 is a field view of the refrigerator in the embodiment of the present invention (BB field view of FIG. 2). It is explanatory drawing of the conventional vacuum heat insulating material (comparative example). It is sectional drawing of the vacuum heat insulating material of Example 1 of this invention. It is a top view of the vacuum heat insulating material of Example 2 of this invention. It is sectional drawing of the vacuum heat insulating material of Example 3 of this invention. It is a top view of the vacuum heat insulating material of Example 4 of this invention.

  A refrigerator provided with a vacuum heat insulating material according to an embodiment of the present invention will be described in detail below with reference to the drawings. Embodiments of the present invention will be described with reference to FIGS.

Example 1
FIG. 1 is a front view showing an external appearance of a refrigerator provided with a vacuum heat insulating material according to Embodiment 1 of the present invention. FIG. 2 is a longitudinal sectional view of the refrigerator including the vacuum heat insulating material according to the first embodiment, and is a cross-sectional view taken along the line AA of FIG. FIG. 3 is a BB field view of the refrigerator including the vacuum heat insulating material according to the first embodiment.

  The refrigerator 1 provided with Example 1 shown in FIG. 1 has the refrigerator compartment 2, the ice storage compartment 3a and the upper stage freezer compartment 3b, the freezer compartment 4, and the vegetable compartment 5 from the top, as shown in FIG. The code | symbol of FIG. 1 is a door which obstruct | occludes the front-surface opening part of each said chamber, All are drawer-type except the refrigerator compartment doors 6a and 6b and the refrigerator compartment doors 6a and 6b which rotate centering on hinges 10 grade | etc., From the top. The ice storage room door 7a, the upper freezer compartment door 7b, the lower freezer compartment door 8, and the vegetable compartment door 9 are arranged. When the drawer type doors 7 to 9 are pulled out, the containers constituting the respective chambers are drawn out together with the doors. Each door 6-9 is provided with a packing 11 for sealing the refrigerator main body 1, and is attached to the indoor peripheral edge of each door 6-9. In the first embodiment, tempered glass is used as the surface material of each of the doors 6 to 9. However, the present invention is not limited to this, and a conventional steel plate or the like may be used. In addition, the rotation partition 6c used as the receiving surface of the packing 11 of the refrigerator compartment door 6b is installed in the refrigerator compartment door 6b side of the refrigerator compartment door 6a.

  Moreover, the partition heat insulation wall 12 is arrange | positioned in order to carry out the partition heat insulation between the refrigerator compartment 2, the ice-making room 3a, and the upper stage freezer compartment 3b. The partition heat insulating wall 12 is a heat insulating wall having a thickness of about 30 to 50 mm, and is made of a single material or a combination of a plurality of heat insulating materials such as a styrofoam, a foam heat insulating material (urethane foam), and a vacuum heat insulating material. Since the temperature zone is the same between the ice making chamber 3a and the upper freezing chamber 3b and the lower freezing chamber 4, a partition member 13 having a packing 11 receiving surface is provided instead of a partition heat insulating wall for partition heat insulation. A partition heat insulation wall 14 is provided between the lower freezer compartment 4 and the vegetable compartment 5 to insulate the partition. Like the partition heat insulation wall 12, it is a heat insulation wall of about 30 to 50 mm, and this is also a styrofoam or foam heat insulation. It is made of a material (urethane foam), a vacuum heat insulating material 50 or the like. Basically, partition heat insulation walls are installed in partitions of rooms with different storage temperature zones such as refrigeration and freezing. In the box 20, storage compartments for the refrigerator compartment 2, the ice making compartment 3a and the upper freezer compartment 3b, the lower freezer compartment 4, and the vegetable compartment 5 are formed from above, respectively. The invention is not particularly limited to this. The refrigerator doors 6a and 6b, the ice making door 7a, the upper freezer compartment door 7b, the lower freezer compartment door 8 and the vegetable compartment door 9 are also particularly limited in terms of opening and closing by rotation, opening and closing by drawer, and the number of doors divided. is not.

  The box 20 includes an outer box 21 and an inner box 22, and a heat insulating part is provided in a space formed by the outer box 21 and the inner box 22 to insulate each storage chamber in the box 20 from the outside. Yes. A vacuum heat insulating material 150 is disposed on either the outer box 21 side or the inner box 22 side, and a space other than the vacuum heat insulating material 150 is filled with a foam heat insulating material 23 such as rigid urethane foam. The description of the vacuum heat insulating material 150 will be described later.

A refrigerator 28 is provided on the back side of the freezer compartments 3a and 4 in order to cool the refrigerator compartment 2, the freezer compartments 3a and 4 and the vegetable compartment 5 to a predetermined temperature. The refrigeration cycle is configured by connecting the cooler 28, the compressor 30, the condenser 31, and a capillary tube (not shown). Above the cooler 28, a blower 27 that circulates the cool air cooled by the cooler 28 in the refrigerator and maintains a predetermined low temperature is disposed.
Moreover, as the heat insulating material which partitions the refrigerator compartment 2 and the ice making room 3a and the upper freezer room 3b, the freezer room 4 and the vegetable room 5, the heat insulating partitions 12 and 14 are arranged, respectively. It is configured. The heat insulating partitions 12 and 14 may be filled with a foam heat insulating material 23 such as rigid urethane foam, and are not particularly limited to the foamed polystyrene 33 and the vacuum heat insulating material 50.

  In addition, an interior lamp 45 having a case 45a protruding toward the heat insulating material 23 is arranged on a part of the top surface of the inner box 22 so that the interior when the refrigerator door is opened is bright and easy to see. is there. The interior light 45 is not particularly limited to a light source such as an LED, a light bulb, a fluorescent light, or a xenon lamp. Since the thickness of the heat insulating material 23 between the case 45a and the outer box 21 is reduced by the arrangement of the interior lamp 45, the vacuum heat insulating material 50 is arranged to ensure the heat insulating performance. It is not specified that the interior lamp 45 is arranged in the illustrated position.

  In addition, a concave portion 40 for accommodating an electrical component 41 such as a substrate for controlling the operation of the refrigerator 1 or a power supply substrate is formed in the rear portion of the top surface of the box 20, and a cover 42 that covers the electrical component 41. Is provided. The height of the cover 42 is arranged so as to be substantially the same height as the top surface of the outer box 21 in consideration of appearance design and securing the internal volume. Although it does not specifically limit, when the height of the cover 42 protrudes from the top | upper surface of an outer box, it is desirable to set it in the range within 10 mm. Along with this, the concave portion 40 is disposed in a state where only the space for housing the electric component 41 is recessed on the heat insulating material 23 side, so that the internal volume is sacrificed to ensure the heat insulating thickness. If the inner volume is increased, the thickness of the heat insulating material 23 between the concave portion 40 and the inner box 22 becomes thin. In this embodiment, the heat insulating performance is ensured by arranging the vacuum heat insulating material 150 on the back surface of the concave portion 40. doing. In the first embodiment, the vacuum heat insulating material 150 is a single vacuum heat insulating material 150 formed in a substantially Z shape so as to straddle the case 45 a of the interior lamp 45 and the electrical component 41. The cover 42 is made of a steel plate in consideration of a fire from the outside or a case where it is ignited for some reason.

  In addition, since the compressor 30 and the condenser 31 arranged at the lower back of the box 20 are components that generate a large amount of heat, in order to prevent heat from entering the inside of the box, a vacuum insulation is provided on the projection surface toward the inner box 22 side. A material 150 is arranged.

  Here, arrangement | positioning of the vacuum heat insulating material 150 in Example 1 is demonstrated with FIG. 2 and FIG. In this embodiment, as shown in FIG. 2, for the purpose of enlarging the internal volume of the refrigerator 1, a part of the inner box 22 of the back side of the refrigerator compartment 2 is recessed to the heat insulating material side as shown in C part in the figure. It has no structure. The heat insulating material wall structure of this portion is usually “inner box / foaming heat insulating material / vacuum heat insulating material / outer box”, but in Example 1, it is “inner box 22 / vacuum heat insulating material 150 / outer box 21” and foamed. The heat insulating material 23 is excluded.

  Moreover, the vacuum heat insulating material 150 is also arranged on the outer surface (the heat insulating material 23 side) of the inner box 22 at the bottom of the vegetable compartment 5. As described above, the vacuum heat insulating material 150 is disposed on the ceiling portion on the inner surface of the outer box 23 on both sides, and the vacuum heat insulating material 150 is disposed on the inner surface of the outer box 23 across the refrigerator compartment 3, the freezer compartments 3 a, 3 b and 4 and the vegetable compartment 5. For the chamber doors 6a and 6b, the freezer compartment door 8, and the vegetable compartment door 9, a vacuum heat insulating material 150 is disposed on the inner surface of the outer box 22 (a glass plate in this embodiment). In addition, a vacuum heat insulating material 150 is also disposed in each of the partition heat insulations 12 and 14. It should be noted that the arrangement and number of vacuum heat insulating materials 150 are not particularly limited.

  Here, the vacuum heat insulating material will be described with reference to FIGS. FIG. 4 shows a conventional vacuum heat insulating material 50, a core material 51, an inner packaging material 52 for temporarily holding the core material 51 in a compressed state, and a core material held in a compressed state by the inner packaging material 52. An outer cover material 53 having a gas barrier layer covering 51 and an adsorbent 54 are included. The covering material 53 is disposed on both surfaces of the vacuum heat insulating material 50, and is configured in a bag shape in which a laminated film of the same size is faced and a certain width portion is thermally welded from the end of each side. In Example 1, glass wool having an average fiber diameter of 4 μm was used as the core material 51 as a laminate of inorganic fibers not bonded or bound by a binder or the like. This glass wool has a cotton shape in which inorganic short fibers are laminated. About the core material 51, since outgas is reduced by using a laminate of inorganic fiber materials, it is advantageous in terms of heat insulation performance. However, the core material 51 is not particularly limited to this. For example, inorganic fibers are formed by heating. There are no particular restrictions on the material, binder-molded material, inorganic fiber such as ceramic fiber, rock wool, glass fiber other than glass wool, and organic fiber. The inner packaging material 52 may not be used depending on the type of the core material 51, and this is not particularly limited.

  The laminate structure of the jacket material 53 is not particularly limited as long as it has gas barrier properties and can be thermally welded. In Example 1, the surface layer, the first gas barrier layer, the second gas barrier layer, the heat The laminate film is composed of four layers of welding layers, the surface layer is a resin film having low hygroscopicity, the first gas barrier layer is a resin film provided with a metal vapor deposition layer, and the second gas barrier layer is a resin film having a high oxygen barrier property. The metal vapor deposition layer is provided, and the first and second gas barrier layers are bonded so that the metal vapor deposition layers face each other. For the heat-welded layer, a film having low hygroscopicity was used as in the surface layer. Specifically, the surface layer is biaxially stretched polypropylene, the first gas barrier layer is polyethylene terephthalate with aluminum vapor deposition, the second gas barrier layer is biaxially stretched ethylene vinyl alcohol copolymer resin film with aluminum vapor deposition, The welding layer was a linear low density polyethylene film. The covering material 53 is not particularly limited to this configuration. The surface layer may be polyamide (nylon), polyethylene terephthalate, etc., and the first and second gas barrier layers may be a metal foil or a resin film provided with a gas barrier film such as an inorganic layered compound or a resin gas barrier coating material. . For example, a polybutylene terephthalate film having a high oxygen barrier property, a polypropylene film having a high versatility, a polyethylene film having a high density, a medium density, a low density, or the like may be used for the heat welding layer. Moreover, the film configuration may be different between the outer box side and the inner box side of the vacuum heat insulating material 50. For example, there is no problem even if the second gas barrier layer is a combination of an aluminum vapor deposition film on one side and an aluminum foil on the other side. Each layer is bonded by a dry laminating method through a two-component curable urethane adhesive, but the adhesive and the bonding method are not particularly limited thereto.

  The purpose of placing a resin with low hygroscopicity on the surface layer and the heat-welded layer is that the above gas barrier layer film with high oxygen barrier property deteriorates due to moisture absorption. It suppresses the amount of moisture absorption of the entire film. Thereby, also in the evacuation process of the vacuum heat insulating material 50, since the amount of moisture brought in by the jacket material 53 is small, the evacuation efficiency is greatly improved, leading to high performance.

  Moreover, although the heat-weldable polyethylene film was used for the encapsulating material 52 and the physical adsorption type synthetic zeolite was used for the adsorbent 54, they are not limited to these materials. The inner packaging material 52 may be a polypropylene film, a polyethylene terephthalate film, a polybutylene terephthalate film or the like that has low hygroscopicity and can be heat-welded and has little outgas. The adsorbent 54 adsorbs moisture (water or water vapor). Thus, either physical adsorption or chemical reaction type adsorption may be used.

  On the other hand, the configuration of the vacuum heat insulating material 150 of Example 1 shown in FIG. 5 is basically the same as that of the vacuum heat insulating material 50 of FIG. The adsorbent 154 and the second adsorbent 155 having a low moisture adsorption rate are arranged. Synthetic zeolite was used as the first adsorbent 154, and calcium oxide was used as the second adsorbent. Here, for synthetic zeolite, a trade name “Molecular Sieve” manufactured by Union Showa and a bead type of model number 5A-HP were used, and for calcium oxide, a quicklime desiccant manufactured by Sakamoto Lime Industry was used.

  The synthetic zeolite may be hydrophilic and have a pore diameter of 0.3 to 1.0 nm, and is not limited to the bead type, and can be used for pellets and other shapes. Natural zeolite may also be used. In this example, synthetic zeolite was used by being dispersed directly between the layers of the core material 151, but it may be put in a bag having air permeability such as a non-woven fabric, and is not particularly limited. As for calcium oxide, powdered quicklime is used in the present embodiment, but the particle size may be large and is not particularly limited. In the present embodiment, the first adsorbent 154 and the second adsorbent 155 are arranged at positions where they do not contact each other as shown in FIG.

The vacuum heat insulating material 150 according to the first embodiment having the above configuration is configured such that the thickness of the core material 51 is set to 10 to 20 mm (depending on the arrangement site), and the density of the core material 51 is set to about 230 (kg / m ³ ). It was used.

  In Example 1, the vacuum heat insulating material 150 is incorporated into each part of the refrigerator 1, and the initial value of the box heat leakage amount and the value after one year have been measured and confirmed, and the initial value is 100 (standard) and the result is 102 after one year. was gotten.

  In addition, about the size of the vacuum heat insulating material 150 used in Example 1, although it match | combined with each part of the refrigerator 1, respectively, although it does not describe concretely, the 1st adsorbent 154 and the 2nd adsorbent 155 are the same. The amount used is also set according to the size of the vacuum heat insulating material 150. The amount of the first adsorbent 154 and the second adsorbent 155 used is not particularly limited.

(Comparative example)
In Example 1, the amount of heat leaked from the box body of the refrigerator incorporating the conventional vacuum heat insulating material 50 was 100 at the initial value and 106 after one year.

(Example 2)
The refrigerator of Example 2 uses powdered calcium oxide as the first adsorbent 254 and granular calcium oxide as the second adsorbent 255 in the vacuum heat insulating material 150 of Example 1, as shown in FIG. The vacuum heat insulating material 250 was applied.
In Example 2, the vacuum heat insulating material 250 was incorporated in each part of the refrigerator 1 and the amount of heat leakage from the box was confirmed. As a result, the initial value 102 and 103 after one year were obtained.

Example 3
In the refrigerator of Example 3, instead of the vacuum heat insulating material 250 of Example 2, as shown in FIG. 7, the first adsorbent 354 and the second adsorbent 355 are the same powdered calcium oxide, The outer cover material 354a of the adsorbent 354 is a non-woven fabric, and the outer cover material 355a of the second adsorbent 355 is a vacuum heat insulating material 350 using a non-woven fabric having lower air permeability than the outer cover material 354a.
In Example 3, the vacuum heat insulating material 350 was incorporated in each part of the refrigerator 1 and the amount of heat leakage from the box was confirmed. As a result, an initial value 101 and a result 102 after one year were obtained.

(Example 4)
In the refrigerator of the fourth embodiment, the first adsorbent 154 is placed on the back side of the core material 51 far from the opening 53a of the jacket material 53 in the second embodiment, as shown in FIG. The adsorbent 155 was the same except that the adsorbent 155 was disposed on the near side of the core material 51 close to the opening 53a of the jacket material 53.
When the vacuum heat insulating material 150 was incorporated in each part of the refrigerator 1 in Example 4 and the amount of heat leaked from the box was confirmed, a result of initial value 100 and 102 after one year was obtained.

  In addition, as a manufacturing method of the vacuum heat insulating material 150, first, as the covering material 53, two rectangular gas barrier films are faced, and the three sides are heat-welded to form a three-sided bag. Thereafter, the core material 51 and the adsorbents are inserted into the three-sided bag, and the bag insulation 53 is thermally welded and sealed while the bag interior is decompressed, whereby the vacuum heat insulating material 150 is obtained. .

  Further, with respect to the positions where the first adsorbent 154 and the second adsorbent 155 are arranged, as shown in FIG. 8B, the inner side of the core material 51 far from the opening 53a of the outer jacket material 53, and the outer side Both the first adsorbent 154 and the second adsorbent 155 may be arranged on the near side of the core material 51 close to the opening 53a of the workpiece 53, respectively. However, the first adsorbent 154 is arranged more on the side farther than the side closer to the opening 53a. On the other hand, the second adsorbent 155 is arranged more on the side closer to the side farther from the opening 53a. In addition, the first adsorbent 154 is present more than the second adsorbent 155 on the side far from the opening 53a, and the second adsorbent 155 is first on the side closer to the opening 53a. More adsorbents 154 are present. The first adsorbent 154 and the second adsorbent 155 may be the first adsorbents 254 and 354 and the second adsorbents 255 and 355 described in Examples 2 and 3, respectively.

  The vacuum heat insulating materials 150, 250, and 350 used in the first to fourth embodiments allow the first adsorbents 154, 254, and 354 having a high adsorption speed to be away from the opening 53 a of the jacket material 53 and have a high vacuum exhaust efficiency. By disposing a large amount in the lower part, the initial internal pressure of the vacuum heat insulating materials 150, 250, 350 can reach a low stable state relatively quickly. For this reason, if the initial heat conductivity shows a low value and this vacuum heat insulating material is used for a refrigerator, it becomes possible to make energy-saving performance favorable. In addition, with respect to the temporal deterioration of the heat insulation performance unique to the vacuum heat insulating material, there is an effect of suppressing the increase in internal pressure over a long period of time by the second adsorbent having a low adsorption speed. This is because a slight amount of water vapor that enters the vicinity of the opening of the jacket material from the outside during the period of use of the vacuum heat insulating material, or water that has been desorbed after being adsorbed by the first adsorbent, This is because it is continuously adsorbed by the adsorbent. In addition, about the vacuum heat insulating material 150,250,350 of the present Examples 1-4, the utilization in the product field | areas which require heat insulation other than a refrigerator, such as a vending machine and a hot-water supply apparatus, can be anticipated.

  As described above, the vacuum heat insulating material according to the present invention and a device such as a refrigerator using the same provide a product and a device with low power consumption because stable heat insulating performance is obtained even after long-term use. it can.

DESCRIPTION OF SYMBOLS 1 Refrigerator, 2 Cold storage room, 3a Ice storage room, 3b Upper freezing room, 4 Lower freezing room, 5 Vegetable room, 6a Refrigerating room door, 6b Refrigerating room door, 7a Ice storage door, 7b Upper freezing room door, 8 Lower freezing room Door, 9 Vegetable room door, 10 Door hinge, 11 Packing, 12, 14 Heat insulation partition, 13 Partition member, 20 Box body, 21 Outer box, 22 Inner box, 23 Foam insulation, 27 Blower, 28 Cooler, 30 Compressor, 31 Condenser, 33 Expanded polystyrene, 40 Recess, 41 Electrical component, 42 Cover, 45 Interior light, 45a Case, 50 Vacuum heat insulating material, 51 Core material, 52 Inner bag, 53 Outer material, 54 Adsorbent 150, 250, 350 Vacuum heat insulating material, 154, 254, 354 First adsorbent, 155, 255, 355 Second adsorbent, 354a Non-woven fabric of first adsorbent, 355a Non-woven fabric of second adsorbent

Claims (7)

In a jacket material in which a film having a gas barrier layer is faced and a part is thermally welded to form a bag, a core material including a fiber material, a first adsorbent, and the first adsorbent In the vacuum heat insulating material in which the second adsorbent having a low moisture adsorption rate is arranged,
The vacuum heat insulating material, wherein the first adsorbent is present more on the side farther from the side closer to the opening of the jacket material. In a jacket material in which a film having a gas barrier layer is faced and a part is thermally welded to form a bag, a core material including a fiber material, a first adsorbent, and the first adsorbent In the vacuum heat insulating material in which the second adsorbent having a low moisture adsorption rate is arranged,
A large amount of the first adsorbent is present on the side far from the opening of the jacket material,
A large amount of the second adsorbent is present on the side close to the opening of the jacket material. In a jacket material in which a film having a gas barrier layer is faced and a part is thermally welded to form a bag, a core material including a fiber material, a first adsorbent, and the first adsorbent In the vacuum heat insulating material in which the second adsorbent having a low moisture adsorption rate is arranged,
On the side far from the opening of the jacket material, the first adsorbent is present more than the second adsorbent,
The vacuum heat insulating material, wherein the second adsorbent is present in a larger amount than the first adsorbent on a side closer to the opening of the jacket material.   The vacuum heat insulating material according to any one of claims 1 to 3, wherein the first adsorbent and the second adsorbent are present at positions where they do not contact each other.   The vacuum heat insulating material according to any one of claims 1 to 3, wherein the first adsorbent is synthetic or natural zeolite, and the second adsorbent is calcium oxide.   The vacuum heat insulating material according to any one of claims 1 to 3, wherein the first adsorbent is powdered calcium oxide and the second adsorbent is granular calcium oxide.   Each of the first and second adsorbents is powdered calcium oxide contained in a bag made of a non-permeable breathable nonwoven fabric, and the non-woven fabric of the first adsorbent is more breathable than the non-woven fabric of the second adsorbent. The vacuum heat insulating material according to claim 1, wherein the vacuum heat insulating material has high performance.

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