JP5426445B2 - Vacuum insulation panel - Google Patents

Description

  The present invention relates to a vacuum heat insulation panel provided with a hygroscopic agent.

  In recent years, vacuum insulating panels that are thin and excellent in heat insulating properties are being adopted as heat insulating materials used in refrigerators and the like. This type of vacuum heat insulation panel includes a core material and an outer packaging material as disclosed in Patent Document 1, for example. The core material is made of glass wool or the like, which is a thin glass fiber cotton, and the outer packaging material is made of a laminated film bag having aluminum foil or the like. This vacuum heat insulating panel is configured by accommodating a core material in an outer packaging material, reducing the pressure inside the outer packaging material, closing the opening, and holding the inner packaging material in a reduced pressure state.

  Further, a moisture absorbent (adsorbent) is accommodated in the outer packaging material of the vacuum heat insulating panel. This hygroscopic agent absorbs the water vapor mixed in the manufacturing process of the vacuum heat insulating panel and the water vapor transmitted through the outer packaging material, and prevents the heat conductivity of the vacuum heat insulating panel from being increased by the water vapor mixing. As the hygroscopic agent, for example, calcium oxide, magnesium chloride and the like are used.

JP 2007-139184 A

  The hygroscopic agent made of calcium oxide is used in a normal temperature environment (for example, 10 to 50 ° C., particularly 10 to 30 ° C.) and in a high temperature environment exceeding 50 ° C. (for example, a refrigerator provided with a vacuum heat insulating panel having the hygroscopic agent). Although it is possible to absorb moisture even in the environment in the container during transportation, the moisture absorption amount of water (water vapor) per unit volume is smaller than that of the moisture absorbent made of magnesium chloride. Therefore, in order to absorb moisture in the outer packaging material, it is necessary to store a larger amount of the moisture absorbing agent in the outer packaging material than in the case of using a hygroscopic agent made of magnesium chloride. However, when a large amount of moisture absorbent is contained in the outer packaging material, the thermal conductivity characteristics of calcium oxide appear, and the thermal conductivity of the vacuum heat insulating panel may increase.

  In addition, the moisture absorbent made of magnesium chloride has a higher moisture absorption amount of water (water vapor) per unit volume in a room temperature environment than the moisture absorbent made of calcium oxide, but in a high temperature environment exceeding 50 ° C, the moisture absorbent absorbs moisture. It has the characteristic of releasing the water (water vapor) that has been used. Therefore, a hygroscopic agent made of magnesium chloride could not be used in a high temperature environment.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a vacuum heat insulating panel that has heat insulating properties and can sufficiently absorb water vapor in the outer packaging material in a normal temperature environment and a high temperature environment. Is to provide.

The vacuum heat insulation panel of the present embodiment is a bag-shaped outer packaging material whose inside is depressurized, a core material that is housed in the outer packaging material, has heat insulation properties, and is housed in the outer packaging material, and includes magnesium oxide and anhydrous a first desiccant containing both magnesium chloride, is housed in the outer material includes a second desiccant containing at least one of calcium oxide and silica gel, and the second desiccant, the first It is placed around the hygroscopic agent .
Further, the vacuum heat insulation panel of the present embodiment has a bag-like outer packaging material whose inside is decompressed, a core material that is housed in the outer packaging material, has heat insulation properties, and is housed in the outer packaging material. Magnesium oxide And a first moisture absorbent containing both anhydrous magnesium chloride, a second moisture absorbent contained in the outer packaging material and containing at least one of calcium oxide and silica gel, water vapor permeability, and the first moisture absorbent. A first storage bag for storing the hygroscopic agent; and a second storage bag having water vapor permeability and storing the first storage bag and the second hygroscopic agent. The second accommodation bag is accommodated in the outer packaging material.

  According to the present invention, since the first hygroscopic agent and the second hygroscopic agent are accommodated in the outer packaging material of the vacuum heat insulating panel, the moisture in the outer packaging material is absorbed by the first hygroscopic agent and the second hygroscopic agent. can do. Here, since the first hygroscopic agent is composed of hygroscopic magnesium oxide and anhydrous magnesium chloride having a large moisture absorption amount, a large amount of water vapor can be absorbed by the first hygroscopic agent in a room temperature environment. Furthermore, the second hygroscopic agent includes at least one of calcium oxide and silica gel that can absorb moisture even in a high temperature environment. Thereby, the water (water vapor) released from the first hygroscopic agent in the high temperature environment can be absorbed by the second hygroscopic agent. Therefore, the water vapor in the outer packaging material can be sufficiently absorbed in a normal temperature environment and a high temperature environment.

Sectional drawing of the vacuum heat insulation panel which shows the 1st Embodiment of this invention The perspective view of the refrigerator body shown excluding the door Front view showing an enlarged cross section of the side wall of the heat insulation box Sectional drawing which follows the AA line of FIG. The figure which shows the result of the endurance test of the hygroscopic agent The figure which shows the result of the test which confirms the relationship between temperature and moisture absorption FIG. 4 equivalent view showing the second embodiment of the present invention FIG. 1 equivalent view showing a third embodiment of the present invention FIG. 1 equivalent view showing a fourth embodiment of the present invention Sectional drawing which follows the BB line of FIG. FIG. 1 equivalent view showing a fifth embodiment of the present invention Sectional drawing which follows the CC line of FIG. FIG. 1 equivalent view showing a sixth embodiment of the present invention

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
First, the refrigerator main body 1 shown in FIG. 2 is configured by incorporating a refrigeration cycle (not shown) or the like in a heat insulating box 2 having a vertically long rectangular box shape with an open front. Moreover, although detailed description is abbreviate | omitted, the inside of the heat insulation box 2 is divided into upper and lower sides (and some right and left), and the several storage chambers 3, such as a refrigerator compartment, a vegetable compartment, a freezer compartment, are provided. Although illustration is omitted, a hinged heat insulating door or a drawer heat insulating door is provided on the front surface of each storage chamber 3.

The heat insulating box 2 includes a steel plate outer box 4, a synthetic resin inner box 5 accommodated in the outer box 4, and a vacuum heat insulating panel 11 provided between the outer box 4 and the inner box 5. And have. Further, as shown in FIG. 3, the heat insulation box 2 may have a gap 6 between the outer box 4 and the inner box 5 other than the vacuum heat insulation panel 11. The gap 6 is provided with a foam heat insulating material (not shown) made of urethane foam or the like and a heat radiating pipe (not shown) forming a part of the condenser of the refrigeration cycle, as necessary.
The vacuum heat insulation panel 11 is affixed on the inner surface of the outer box 4 and has a plate shape. As shown in FIGS. 1, 3, and 4, the vacuum heat insulating panel 11 includes an outer packaging material 12, a core material 13, a first hygroscopic agent 14, and a first hygroscopic agent 15.

  As shown in FIG. 3, the outer packaging material 12 is configured by laminating (thermally welding) two laminated films (first laminated film 16 and second laminated film 17) at the periphery. The first laminated film 16 is located on the outer box 4 side, and the second laminated film 17 is located on the inner box 3 side.

The first laminated film 16 has a three-layer structure having a surface protective layer 16a, a gas barrier layer 16b, and a heat welding layer 16c in this order from the outer side (outer box 4) toward the inner side (core material 13 side). .
The second laminated film 17 has a three-layer structure having a surface protective layer 17a, a gas barrier layer 17b, and a heat welding layer 17c in this order from the outside (inner box 5 side) to the inside (core material 13 side). Has been. The surface protective layers 16a and 17a are made of a relatively heat-resistant synthetic resin such as polyethylene terephthalate. The gas barrier layers 16b and 17b are formed of a metal deposit (for example, an aluminum deposit obtained by depositing aluminum on a resin film) or a metal foil (for example, an aluminum foil). The heat welding layers 16c and 17c are made of a synthetic resin having heat welding properties such as high density polyethylene.

The outer packaging material 12 overlaps the surface of the heat-bonding layer 16c of the first laminated film 16 and the surface of the heat-welded layer 17c of the second laminated film 17 with each other, and pressurizes and heats the surrounding portion to form the first The laminated film 16 and the second laminated film 17 are thermally welded and sealed to form a bag shape.
At this time, an adhesive ear 18 is provided on the outer edge of the vacuum heat insulating panel 11 so as to protrude from the periphery of the core member 13. The ear 18 is folded back to the inner box 5 side (left side in FIG. 3) and fixed to the surface of the second laminated film 17 with an adhesive or a tape.

  As shown in FIG. 1, the core material 13 is composed of a plurality (two in this embodiment) of laminated bodies 13 a made of inorganic fibers having excellent heat insulation properties such as glass wool. The two laminated bodies 13a have the same shape and have a polygonal shape, for example, a rectangular flat plate shape. The two laminated bodies 13a are accommodated in the outer packaging material 12 in a laminated state.

  As shown in FIG. 3, the first hygroscopic agent 14 includes both magnesium oxide 14a and anhydrous magnesium chloride 14b, and more preferably 50% by mass of magnesium oxide 14a and 50% by mass of anhydrous magnesium chloride. 14b. As will be described in detail later, the magnesium oxide 14a and the anhydrous magnesium chloride 14b are materials that absorb more moisture than calcium oxide or silica gel in a normal temperature environment of 10 to 30 ° C. Magnesium oxide 14a and anhydrous magnesium chloride 14b are formed in the form of powder or granules (granularity of about 0.5 mm to 3 mm). Moreover, it is preferable that this magnesium oxide 14a and anhydrous magnesium chloride 14b are the same quantity, and are mixed uniformly. The first hygroscopic agent 14 is accommodated in a first breathable bag 21 having air permeability such as a nonwoven fabric.

  A plurality of the first breathable bags 21 containing both the magnesium oxide 14 a and the anhydrous magnesium chloride 14 b are uniformly distributed between the laminated bodies 13 a of the core material 13. Thereby, the 1st hygroscopic agent 14 is uniformly disperse | distributed and arrange | positioned in the outer packaging material 12, as shown in FIG.1 and FIG.4. The first breathable bag 21 contains, for example, 5 to 20 g of the first hygroscopic agent 14 per bag, and more preferably contains 5 to 10 g of the first hygroscopic agent 14 per bag.

  The second hygroscopic agent 15 includes at least one of calcium oxide 15a and silica gel 15b. Both the calcium oxide 15a and the silica gel 15b are materials that can absorb moisture in an environment of 10 to 70 ° C. without being significantly affected by temperature. The calcium oxide 15a and the silica gel 15b are formed in the form of powder or granules (granularity of about 0.5 mm to 3 mm). When both the calcium oxide 15a and the silica gel 15b are included, 50% by mass is preferable. The second hygroscopic agent 15 is accommodated in the second breathable bag 22. The second breathable bag 22 is the same as the first breathable bag 21 described above, and is a breathable bag made of a nonwoven fabric or the like.

  A plurality of second breathable bags 22 including at least one of calcium oxide 15 a and silica gel 15 b are disposed between the laminated bodies 13 a of the core material 13. Specifically, the second breathable bag 22 is disposed between the laminated bodies 13a of the core material 13 and surrounds the first breathable bag 21 as shown in FIGS. In the first embodiment, the second breathable bag 22 is arranged in four directions around the first breathable bag 21. Thereby, the 2nd breathable bag 22 is also disperse | distributed uniformly to the core material 13, and is arrange | positioned. The second breathable bag 22 contains, for example, 5 to 20 g of the second moisture absorbent 15 per bag, and more preferably contains 5 to 10 g of the second moisture absorbent 15 per bag. Note that the total amount of the first hygroscopic agent 14 and the total amount of the second hygroscopic agent 15 in the vacuum heat insulating panel 11 is arbitrary, but if the environment where the vacuum heat insulating panel 11 is placed is not likely to be a high temperature environment, the first The total amount of the moisture absorbent 14 may be larger than the total amount of the second moisture absorbent 15.

  After the vacuum insulation panel 11 accommodates the core material 13 (two laminated bodies 13a), the first hygroscopic agent 14 and the second hygroscopic agent 15 in the outer packaging material 12, the inside of the outer packaging material 12 is depressurized, While maintaining the reduced pressure, the opening of the outer packaging material 12 is sealed by heat welding, and the outer packaging material 12 is sealed. Moreover, the ear | edge part 18 is fixed as mentioned above.

Next, the operation and effect of this embodiment will be described.
A first hygroscopic agent 14 and a second hygroscopic agent 15 are accommodated in the outer packaging material 12 of the vacuum heat insulating panel 11. Therefore, the water vapor mixed in the outer packaging material 12 in the manufacturing process of the vacuum heat insulating panel 11 or the water vapor transmitted through the outer packaging material 12 after manufacturing the vacuum heat insulating panel 11 is the first hygroscopic agent 14 provided in the outer packaging material 12. The second moisture absorbent 15 absorbs moisture. Thereby, it can prevent that the heat conductivity of the vacuum heat insulation panel 11 becomes high.

  Here, the 1st hygroscopic agent 14 is comprised including both the magnesium oxide 14a and the anhydrous magnesium chloride 14b. Therefore, in a normal temperature environment, for example, at 10 to 30 ° C., the first hygroscopic agent 14 can absorb more water vapor than, for example, the same mass of the hygroscopic agent made of only calcium oxide. Therefore, it is possible to absorb moisture in the outer packaging material 12 over a long period of time, and the vacuum heat insulating panel 11 is excellent in moisture absorption durability. Further, the second hygroscopic agent 15 includes at least one of calcium oxide 15a and silica gel 15b. Therefore, the water (water vapor) released from the first hygroscopic agent 14 can be absorbed in a high-temperature environment, for example, at 50 to 70 ° C. Therefore, the water vapor in the outer packaging material 12 can be sufficiently absorbed in a normal temperature environment and a high temperature environment, for example, at 10 to 70 ° C., and the moisture content in the outer packaging material 12 can be absorbed over a long period of time. It is possible to further improve the properties.

In order to confirm the hygroscopic effect of the vacuum heat insulating panel 11 of the present embodiment, the hygroscopic test shown in FIGS. 5 and 6 was performed.
The example product (sample) shown in FIGS. 5 and 6 includes 10 g of the first hygroscopic agent 14 (5 g of magnesium oxide 14a and 5 g of anhydrous magnesium chloride 14b) and 10 g of the second hygroscopic agent 15 (in this test). 10 g of calcium oxide 15a) is uniformly mixed. Moreover, 20 g of calcium oxide and silica gel used as comparative example products (samples) were used. For reference, 20 g of magnesium oxide was also tested.

  First, a test was conducted to confirm the moisture absorption rate of each sample when the samples (Example products and Comparative Example products) were left in a general room, that is, the durability of each sample. FIG. 5 shows the results of the time (number of days) each sample was placed in the room and the moisture absorption rate at that time. In this test, the example product and each comparative product were left in a general room (room where room temperature and humidity were not adjusted (in a room temperature environment)) to determine the moisture absorption rate.

  The moisture absorption ratio is a value (expressed as a percentage) obtained by dividing the amount of moisture absorbed in a predetermined time by the mass of the moisture absorbent before the test. The moisture absorption amount (g) absorbed in a predetermined time is “the mass of the hygroscopic agent (the mass of the hygroscopic agent including moisture) after a predetermined time has elapsed from the start of the test (in FIG. 4, 5 days from the start of the test, 30 days from the start of the test). ) "Is subtracted from" mass of hygroscopic agent before test (g) ". For example, when the mass of the hygroscopic agent before the test is 20 g and the mass of the hygroscopic agent from the start of the test is 26 g, the moisture absorption amount = 26 (g) −20 (g) = 6 (g), and the moisture absorption ratio is 6 (g) ÷ 20 (g) × 100 (%) = 30 (%).

  As shown in FIG. 5, in a room temperature environment, the example products have a moisture absorption amount superior to that of a hygroscopic agent made of calcium oxide and a hygroscopic agent made of silica gel, that is, it can absorb moisture over a long period of time and is durable. I can understand that it is excellent.

  Next, the test which confirms the moisture absorption amount of each temperature of each sample (Example goods and each comparative example goods) was done. FIG. 6 shows the amount of moisture absorbed when each sample is left in a room maintained at a predetermined temperature for a predetermined time. The amount of moisture absorption is determined by subtracting the “mass of the hygroscopic agent before starting the test” from the “mass of the hygroscopic agent after the test”. In FIG. 6, the amount of moisture absorbed by the hygroscopic agent composed of 20 g of calcium oxide is set to 20, and the amount of hygroscopicity of other samples is expressed as a ratio to the hygroscopic agent composed of calcium oxide. For example, as shown in FIG. 6, when the example product is left in a room at 10 ° C., the moisture absorption amount of the example product is twice as much as the moisture absorption agent made of calcium oxide. When a hygroscopic agent made of magnesium oxide is left in a room at 70 ° C., the hygroscopic amount of the hygroscopic agent is −20 with respect to the hygroscopic agent made of calcium oxide. That is, when the environmental temperature is 70 ° C., the moisture absorbent made of magnesium oxide releases an amount of water corresponding to the amount of moisture absorbed when the moisture absorbent made of calcium oxide is 70 ° C.

  As shown in FIG. 6, when the hygroscopic agent made of calcium oxide is used as a reference, the example product has a higher moisture absorption amount than the hygroscopic agent made of calcium oxide in a normal temperature environment (10 to 30 ° C.). In addition, in the example products, the amount of moisture absorption is not negative in a high-temperature environment (50 to 70 ° C.), that is, the absorbed water (water vapor) is not released. Therefore, the vacuum heat insulation panel 11 in which the first moisture absorbent 14 and the second moisture absorbent 15 made of the same components as those of the example product are accommodated in the outer packaging material 12 is water vapor in the outer packaging material 12 in a normal temperature environment and a high temperature environment. Can absorb moisture sufficiently.

  In the present embodiment, since the second hygroscopic agent 15 is disposed around the first hygroscopic agent 14, even if water is released from the first hygroscopic agent 14 in a high temperature environment, the second hygroscopic agent 15 Can absorb moisture reliably. Thereby, even if it uses the vacuum heat insulation panel 11 in a high temperature environment, it can suppress that the heat conductivity of the vacuum heat insulation panel 11 by the water discharge | released from the 1st moisture absorbent 14 becomes high.

  Moreover, since the 1st moisture absorbent 14 and the 2nd moisture absorbent 15 were disperse | distributed uniformly in the outer packaging material 12, the variation in thermal conductivity can be reduced. Further, the first hygroscopic agent 14 and the second hygroscopic agent 15 are uniformly dispersed between the laminated bodies 13a of the core material 13 and accommodated in the outer packaging material 12, and the inside of the outer packaging material 12 is depressurized so that the vacuum heat insulating panel 11 is provided. Since it is the structure to obtain, the laminated bodies 13a of the core material 13 after pressure reduction are easy to arrange | position in parallel. Thereby, for example, a rectangular plate-like vacuum heat-insulating panel 11 having a good appearance can be obtained. Furthermore, since the first hygroscopic agent 14 and the second hygroscopic agent 15 are disposed between the laminated bodies 13 a of the core material 13, the first hygroscopic agent 14 and the second hygroscopic agent are disposed on the surface side of the vacuum heat insulating panel 11. 15 is not located. Therefore, the surface of the vacuum heat insulation panel 11 can be flattened and the appearance can be improved.

(Second Embodiment)
FIG. 7 shows a vacuum heat insulation panel 31 according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same part as the said 1st Embodiment, and the detailed description is abbreviate | omitted.
In the second embodiment, as shown in FIG. 7, the first breathable bag 21 in which the first hygroscopic agent 14 is accommodated and the second breathable bag 22 in which the second hygroscopic agent 15 is accommodated. The arrangement is different from that of the first embodiment.
That is, in the vacuum heat insulation panel 31 of the second embodiment, the first breathable bag 21 in which the first hygroscopic agent 14 is accommodated is arranged at the corner of the core member 13 (laminated body 13a), and the second The second breathable bag 22 in which the hygroscopic agent 15 is accommodated is arranged in four directions with the first breathable bag 21 as the center.

  The core material 13 shown in FIG. 7 has a rectangular flat plate shape, and the first breathable bag 21 in which the first hygroscopic agent 14 is accommodated is disposed at a corner (near the four corners) of the core material 13. . The first breathable bag 21 is arranged at five corners if the core 13 is a pentagonal flat plate, and is arranged at six corners if the core 13 is a hexagonal flat plate. Be placed.

  Here, the outer packaging material 12 is deformed in accordance with the shape of the core material 13 in the process of reducing the pressure in the outer packaging material 12. At this time, the outer packaging material 12 is pulled at the corners of the core material 13, and the three-layer structure becomes thin at the corners of the first laminated film 16 and the second laminated film 17, and at the same time, the gas barrier layers 16b and 17b. Cracks (metal deposits, metal foil) enter the water vapor easily.

  According to the present embodiment, the first breathable bag 21 and the second breathable bag 21 in which the first hygroscopic agent 14 is accommodated at the corner portions of the core material 13 that is likely to be thin in the outer packaging material 12. Since the second air-permeable bag 21 containing the hygroscopic agent 15 is disposed, the water vapor transmitted from the corners of the outer packaging material 12 can be efficiently absorbed.

(Third embodiment)
FIG. 8 also shows a vacuum heat insulation panel 41 of the third embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same part as the said 1st Embodiment, and the detailed description is abbreviate | omitted.
The first hygroscopic agent 14 and the second hygroscopic agent 15 of the vacuum heat insulating panel 41 are not accommodated in the first breathable bag 21 and the second breathable bag 22 shown in the first embodiment, The material 13 is uniformly distributed between the laminated bodies 13a.

  The magnesium oxide 14a and the anhydrous magnesium chloride 14b of the first hygroscopic agent 14 in the vacuum heat insulation panel 41 are each in the form of granules. It is preferable that the maximum granular length of magnesium oxide 14a and anhydrous magnesium chloride 14b is 0.5 to 3 mm. Moreover, when the calcium oxide 15a is used as the 2nd moisture absorbent 15, the calcium oxide 15a has comprised the granular form. The granular maximum length of the calcium oxide 15a is preferably 0.5 to 3 mm. In addition, when the silica gel 15b is used as the 2nd hygroscopic agent 15, the silica gel 15b has comprised the granular form. The granular maximum length of the silica gel 15b is preferably 0.5 to 3 mm.

  In this embodiment, after mixing magnesium oxide 14a, anhydrous magnesium chloride 14b, and calcium oxide 15a (or silica gel 15b), the first hygroscopic agent 14 and the second hygroscopic agent 14 are mixed by sprinkling between the laminated bodies 13a of the core material 13. The hygroscopic agent 15 is disposed between the laminated bodies 13 a of the core material 13. Thereafter, the core material 13 is accommodated in the outer packaging material 12 and decompressed, whereby the vacuum heat insulation panel 41 is obtained.

  According to the said structure, the 1st hygroscopic agent 14 and the 2nd hygroscopic agent 15 are easy to mix uniformly, and can reduce the variation in heat conductivity. Furthermore, since the second hygroscopic agent 15 is likely to be present in the vicinity of the first hygroscopic agent 14, water (water vapor) released from the first hygroscopic agent 14 is efficiently absorbed by the second hygroscopic agent 15. Can do.

(Fourth embodiment)
9 and 10 also show a vacuum heat insulation panel 51 according to a fourth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same part as the said 1st Embodiment, and the detailed description is abbreviate | omitted.
All of the first hygroscopic agent 14 of the vacuum heat insulation panel 51 is accommodated in the first accommodation bag 52. The 1st accommodation bag 52 consists of material which permeate | transmits water vapor | steam, for example, a nonwoven fabric. In the present embodiment, the first breathable bag 21 and the second breathable bag 22 shown in the first embodiment are not used.

The first storage bag 52 that stores the first hygroscopic agent 14 is stored in a second storage bag 53 that is larger than the first storage bag 52. The second storage bag 53 is made of a nonwoven fabric that allows water vapor to pass therethrough. All of the second hygroscopic agent 15 is also accommodated in the second accommodation bag 53. The second hygroscopic agent 15 is preferably stored so as to cover one side of the first storage bag 52, more preferably the entire first storage bag 52.
According to the above configuration, since the second hygroscopic agent 15 is disposed so as to cover the first hygroscopic agent 14, water (water vapor) released from the first hygroscopic agent 14 is used as the second hygroscopic agent. 15 can absorb moisture efficiently.

(Fifth embodiment)
11 and 12 also show a vacuum heat insulation panel 61 according to a fifth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same part as the said 1st Embodiment, and the detailed description is abbreviate | omitted.
All of the first hygroscopic agent 14 and all of the second hygroscopic agent 15 of the vacuum heat insulating panel 61 are accommodated in the mixed accommodation bag 62. The mixed storage bag 62 is made of a material that allows water vapor to pass therethrough, for example, a nonwoven fabric. In the present embodiment, the first breathable bag 21 and the second breathable bag 22 shown in the first embodiment are not used.

It is preferable that all of the first hygroscopic agent 14 and the second hygroscopic agent 15 accommodated in the mixed accommodation bag 62 are uniformly mixed.
As shown in FIG. 11, the mixed accommodation bag 62 is disposed between the laminated bodies 13 a of the core material 13 in the outer packaging material 12.

  According to the above configuration, the first hygroscopic agent 14 and the second hygroscopic agent 15 are accommodated in the mixed storage bag 62, so the mixed storage bag 62 and the second hygroscopic agent 15 are in the vicinity of the first hygroscopic agent 14. Easy to exist. Therefore, water (water vapor) released from the first hygroscopic agent 14 can be efficiently absorbed by the second hygroscopic agent 15. In addition, since the first hygroscopic agent 14 and the second hygroscopic agent 15 are accommodated in one mixing and accommodating bag 62, the first hygroscopic agent 14 and the second hygroscopic agent 15 are accommodated in the outer packaging material 12. Becomes easier.

(Sixth embodiment)
FIG. 13 also shows a vacuum heat insulation panel 71 according to the sixth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same part as the said 1st Embodiment, and the detailed description is abbreviate | omitted.
The core material 72 used in the vacuum heat insulation panel 71 does not have a laminated structure, and has a single flat plate shape. The vacuum heat insulation panel 71 includes a first breathable bag 21 containing the first hygroscopic agent 14 and a second ventilation containing the second hygroscopic agent 15 between the outer packaging material 12 and the core material 72. A sex bag 22 is arranged.

At this time, the second breathable bag 22 is arranged so as to surround the first breathable bag 21 as in the first embodiment.
Also in the above configuration, the same effect as that of the first embodiment can be obtained.

The present invention is not limited to the embodiment described above and shown in the drawings, and the following modifications and expansions are possible.
Three or more layers of the core material 13 may be laminated, and the first hygroscopic agent 14 and the second hygroscopic agent 15 may be appropriately disposed between the respective layers.
In the sixth embodiment, the arrangement of the first hygroscopic agent 14 and the second hygroscopic agent 15 has been described in the same arrangement as in the first embodiment. However, in the sixth embodiment, the outer packaging material 12 and the core material 73 are arranged. The first hygroscopic agent 14 and the second hygroscopic agent 15 may be provided between the first and second hygroscopic agents in the configuration shown in the second to fifth embodiments.
Although this invention demonstrated as an example the vacuum heat insulation panel used for a refrigerator, it can be applied to the vacuum heat insulation panel used in a 70 degreeC or less use environment.
In addition, the present invention can be implemented with appropriate modifications without departing from the scope of the invention.

  In the drawings, 11, 31, 41, 51, 61 and 71 are vacuum heat insulating panels, 12 is an outer packaging material, 13 and 72 are core materials, 13a is a laminate, 14 is a first hygroscopic agent, 14a is magnesium oxide, 14b Is anhydrous magnesium chloride, 15 is a second hygroscopic agent, 15a is calcium oxide, 15b is silica gel, 52 is a first containing bag, 53 is a second containing bag, and 62 is a mixed containing bag.

Claims (6)

An outer packaging material in the form of a bag, the inside of which is decompressed;
A core material housed in the outer packaging material and having heat insulation properties;
A first hygroscopic agent contained in the outer packaging material and containing both magnesium oxide and anhydrous magnesium chloride;
A second hygroscopic agent contained in the outer packaging material and containing at least one of calcium oxide and silica gel ,
The vacuum heat insulating panel, wherein the second moisture absorbent is disposed around the first moisture absorbent . An outer packaging material in the form of a bag, the inside of which is decompressed;
A core material housed in the outer packaging material and having heat insulation properties;
A first hygroscopic agent contained in the outer packaging material and containing both magnesium oxide and anhydrous magnesium chloride;
A second hygroscopic agent contained in the outer packaging material and containing at least one of calcium oxide and silica gel;
A first containing bag having water vapor permeability and containing the first hygroscopic agent;
A second storage bag that has water vapor permeability and stores the first storage bag and the second hygroscopic agent;
The vacuum insulation panel, wherein the second accommodation bag is accommodated in the outer packaging material . The core material is composed of a plurality of laminates,
3. The vacuum heat insulating panel according to claim 1, wherein the first hygroscopic agent and the second hygroscopic agent are arranged between the cores. The core material is a substantially polygonal flat plate,
The vacuum heat insulation panel according to any one of claims 1 to 3, wherein the first hygroscopic agent and the second hygroscopic agent are arranged at corners of the core member.   The vacuum heat insulation panel according to any one of claims 1 to 3, wherein the first hygroscopic agent and the second hygroscopic agent are uniformly distributed. Having a water vapor permeability, comprising a mixing and storing bag for mixing and storing the first hygroscopic agent and the second hygroscopic agent;
The vacuum insulation panel according to any one of claims 1 to 5, wherein the mixed accommodation bag is accommodated in the outer packaging material.

Images