JP6132826B2 - Vacuum insulation and insulation box - Google Patents

Description

  The present invention relates to a vacuum heat insulating material and a heat insulating box.

  As a conventional vacuum heat insulating material used as a heat insulating material for a refrigerator or the like, there is “a protective sheet provided between an adsorbent and a jacket material” (for example, see Patent Document 1).

JP 2004-218747 A (Claims 1, 3 to 5, paragraphs [0015] to [0016])

  In Patent Document 1, a laminate film containing an aluminum foil or a laminate film containing an aluminum vapor deposition layer is used as a protective sheet between the adsorbent and the outer packaging material, so that the adsorbent and the outer packaging material are not in direct contact with each other, and sealed under reduced pressure. Prevents pinholes during vacuum packaging. However, when a laminate film is used as a protective sheet as in Patent Document 1, the generation of pinholes at the time of vacuum sealing can be suppressed. However, since the laminate film impedes ventilation to the adsorbent, The adsorption rate of the gas remaining in the gas and the gas that passes through the outer packaging material and enters the vacuum heat insulating material (for example, water, nitrogen, oxygen, carbon dioxide, etc., hereinafter referred to as “heat conduction gas”) decreases, and the There was a problem that a vacuum heat insulating material with low thermal conductivity could not be obtained. Moreover, by using a laminate film as the protective sheet, there is a problem that the material price of the vacuum heat insulating material increases, and an inexpensive vacuum heat insulating material cannot be obtained.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a vacuum heat insulating material and a heat insulating box that have high durability, can be used for a long period of time, and are inexpensive. .

  The vacuum heat insulating material according to the present invention includes a core material that holds a vacuum space, an outer packaging material that covers the core material, a first adsorbent in powder form, and a first package that covers the first adsorbent. A first adsorbing member disposed in contact with the inner surface of the outer packaging material, and a second adsorbent having a particle size larger than that of the first adsorbent, the first adsorbing member And a second adsorbing member surrounded by the core material.

  Moreover, the heat insulation box which concerns on this invention is equipped with the above-mentioned vacuum heat insulating material.

  According to the present invention, by enclosing the second adsorbing member including the second adsorbent having a particle size larger than that of the powder-shaped first adsorbent with the first adsorbing member and the core material, Generation of pinholes can be prevented. Further, according to the present invention, since the second adsorbing member is surrounded by the first adsorbing member and the core material, the ventilation to the second adsorbent is not hindered. Furthermore, according to this invention, a vacuum heat insulating material is comprised by the simple method of surrounding a 2nd adsorption member with a 1st adsorption member and a core material. Therefore, it is possible to obtain a vacuum heat insulating material and a heat insulating box that have high durability, can be used for a long period of time, and are inexpensive.

It is sectional drawing which shows schematic structure of the vacuum heat insulating material 1 which concerns on Embodiment 1 of this invention. It is sectional drawing which shows schematic structure of the vacuum heat insulating material 1 which concerns on Embodiment 2 of this invention. It is sectional drawing which shows schematic structure of the vacuum heat insulating material 1 which concerns on Embodiment 3 of this invention. It is sectional drawing which shows schematic structure of the heat insulation box 100 which concerns on Embodiment 4 of this invention.

Embodiment 1 FIG.
The vacuum heat insulating material 1 which concerns on Embodiment 1 of this invention is demonstrated. FIG. 1 is a cross-sectional view showing a schematic configuration of the vacuum heat insulating material 1 according to the first embodiment. In the following drawings including FIG. 1, the dimensional relationship and shape of each component may differ from the actual ones. Specific dimensions and the like of each component should be determined in consideration of the following description.

  As shown in FIG. 1, the vacuum heat insulating material 1 includes a core material 2 that holds a vacuum space, an outer packaging material 3 that has a gas barrier property and covers the core material 2, and between the core material 2 and the outer packaging material 3. And a first suction member 4 disposed in contact with the inner surface of the outer packaging material 3, and a second suction member 5 surrounded by the first suction member 4 and the core material 2. . The internal space defined by the outer packaging material 3 is sealed under reduced pressure by sealing the opening in a state where the pressure is reduced to a degree of vacuum of about 1 to 3 Pa. The opening is sealed by welding the peripheral edge of the outer packaging material 3 by heat sealing or the like. The vacuum heat insulating material 1 has a substantially rectangular flat plate shape as a whole.

  The core material 2 has a configuration in which fiber assemblies such as glass wool are laminated. The fiber aggregate is generally manufactured by a centrifugal method if it is glass wool, and is manufactured by a spunbond method if it is a resin fiber, but the manufacturing method of the fiber aggregate is not particularly limited. . Further, the fiber aggregate constituting the core material 2 may be one formed by heating and pressing, one hermetically sealed using an inner packaging material, or one bound with a binder. .

  The outer packaging material 3 is an outer packaging material used for an existing vacuum heat insulating material, and is a laminated film having a multilayer structure. This multilayer structure has, for example, a structure in which a polyethylene layer, an aluminum-deposited ethylene-vinyl alcohol layer, an aluminum-deposited polyethylene terephthalate layer, and a nylon layer are laminated on the outermost layer in order from the inner surface side (core material 2 side). The configuration of the outer packaging material 3 is not limited to the above-described configuration, and a polypropylene layer may be included. Moreover, a vapor deposition layer is not limited to an aluminum vapor deposition layer, You may use an alumina vapor deposition layer or a silica vapor deposition layer.

  The configuration of the outer packaging material 3 is not particularly limited as long as it has gas barrier properties. For example, although the thickness of each layer which comprises the outer packaging material 3 can be about 10-30 micrometers, it is not limited to this.

  The first adsorbing member 4 includes a powder-form first adsorbent 40 capable of adsorbing at least moisture, and a first packaging material 41 that covers the first adsorbent 40. In the first embodiment, the average particle size of the first adsorbent 40 may be less than 0.1 mm.

  The second adsorbing member 5 includes a second adsorbent 50 that can adsorb at least moisture, and a second packaging material 51 that covers the second adsorbent 50. In the first embodiment, the particle size of the second adsorbent 50 is configured to be larger than the particle size of the first adsorbent 40. The particle size of the second adsorbent 50 may be an average of 0.1 mm to 100 mm.

  In the vacuum heat insulating material 1 of the first embodiment, the heat conduction gas adsorption rate of the second adsorption member 5 may be configured to be higher than the heat conduction gas adsorption rate of the first adsorption member 4. good.

  Although the 1st adsorbent 40 and the 2nd adsorbent 50 are comprised with materials with moisture adsorption property, such as calcium oxide (CaO), for example, it is not limited to this. For example, the first adsorbent 40 and the second adsorbent 50 may be made of silica gel or zeolite. Further, the first adsorbent 40 and the second adsorbent 50 may be configured by combining two or more materials. Further, the constituent components of the first adsorbent 40 and the second adsorbent 50 may be the same or different.

  The first wrapping material 41 and the second wrapping material 51 are made of air-permeable members such as paper, non-woven fabric, plastic film (for example, polyethylene film), or mesh cloth. The first packaging material 41 and the second packaging material 51 are not particularly limited in configuration as long as they have air permeability. For example, the first wrapping material 41 and the second wrapping material 51 may be two or more types of members having air permeability selected from the group consisting of paper, non-woven fabric, plastic film, and mesh cloth. You may comprise as a breathable laminated material (for example, laminated film) which laminated the member. Moreover, the structure of the 1st packaging material 41 and the 2nd packaging material 51 may be the same, or may differ.

  Next, the manufacturing process of the vacuum heat insulating material 1 which concerns on this Embodiment 1 is demonstrated.

  In the manufacturing process of the vacuum heat insulating material 1 according to the first embodiment, first, the core material 2 and the outer packaging material 3 are dried. Water is removed from the core material 2 and the outer packaging material 3 by subjecting the core material 2 covered with the outer packaging material 3 to heat treatment at 100 ° C. for 2 hours.

  Next, the first adsorption member 4 is disposed so as to contact the inner surface of the outer packaging material 3, and the second adsorption member 5 is surrounded by the first adsorption member 4 and the core material 2. 1 between the adsorption member 4 and the core material 2. You may arrange | position the 1st adsorption member 4 and the 2nd adsorption member 5 in the state accumulated previously.

  Next, the inside of the outer packaging material 3 is decompressed to a degree of vacuum of about 1 to 3 Pa, and the opening is welded by heat sealing or the like in the decompressed state, and the interior of the outer packaging material 3 is sealed under reduced pressure. The vacuum heat insulating material 1 is obtained through the above steps.

  Next, the effect of this Embodiment 1 is demonstrated.

  In the vacuum heat insulating material 1 of the first embodiment, the first adsorbing member 4 including the first adsorbent 40 in the form of a powder is arranged in contact with the inner surface of the outer packaging material 3. A second adsorbing member 5 having a second adsorbent 50 having a large particle size is surrounded by the first adsorbing member 4 and the core material 2. Therefore, since the second adsorbent 50 having a large particle size does not directly contact the outer packaging material 3, it is possible to suppress the occurrence of pinholes in the outer packaging material 3 at the time of vacuum sealing. Therefore, in this Embodiment 1, the highly durable vacuum heat insulating material 1 can be provided.

  Moreover, in the vacuum heat insulating material 1 of this Embodiment 1, since the 2nd adsorption member 5 is surrounded by the 1st adsorption member 4 and the core material 2, ventilation of the 2nd adsorption member 5 is inhibited. There is nothing to do. Therefore, in the vacuum heat insulating material 1 of this Embodiment 1, since the adsorption rate of heat conductive gas does not fall, the vacuum heat insulating material 1 which can maintain heat conductivity low over a long period of time can be provided. Moreover, in this Embodiment 1, the cheap vacuum heat insulating material 1 can be provided by not using a protection sheet.

  Moreover, the vacuum heat insulating material 1 of this Embodiment 1 is heat-conductive by making the adsorption rate of the heat conduction gas in the 2nd adsorption member 5 higher than the adsorption rate of the heat conduction gas in the 1st adsorption member 4. The vacuum heat insulating material 1 whose rate is further lowered over a long period of time can be obtained.

  In the first embodiment, the first adsorption member 4 is disposed so as to be in contact with the inner surface of the outer packaging material 3, and the second adsorption member 5 is surrounded by the first adsorption member 4 and the core material 2. As described above, the second adsorption member 5 can be manufactured by a simple method in which the second adsorption member 5 is disposed between the first adsorption member 4 and the core material 2. Therefore, in the vacuum heat insulating material 1 of this Embodiment 1, since the vacuum heat insulating material 1 can be manufactured without using members, such as a protection sheet, the energy in a manufacturing process can be reduced and the environmental load in a production process can be reduced. An inexpensive vacuum heat insulating material 1 that can be reduced can be obtained.

  Hereinafter, the effects of the first embodiment will be specifically described using Examples 1 to 3.

<Example 1>
Example 1 is a test for the generation of pinholes in the vacuum heat insulating material 1 of the first embodiment.

  In the vacuum heat insulating material 1 of the first embodiment, the core material 2 is made of glass wool. The outer packaging material 3 was composed of a laminate film in which a polyethylene layer, an aluminum-deposited ethylene-vinyl alcohol layer, an aluminum-deposited polyethylene terephthalate layer, and a nylon layer were laminated. The first adsorbent 40 was composed of calcium oxide in powder form with an average of less than 0.1 mm. The first wrapping material 41 was composed of a laminated film of paper having air permeability and a polyethylene film. The second adsorbent 50 was composed of calcium oxide having an average particle size of 3 mm. The second packaging material 51 was composed of a laminated film of paper and polyethylene film.

  The vacuum heat insulating material of the comparative example was configured such that calcium oxide having an average particle size of 3 mm was in direct contact with the outer packaging material.

  100 pieces of the vacuum heat insulating material 1 of Embodiment 1 and the vacuum heat insulating material of the comparative example were manufactured. In the vacuum heat insulating material of the comparative example, 18 vacuum defects due to the occurrence of pinholes in the outer packaging material occurred. On the other hand, the vacuum heat insulating material 1 of the first embodiment did not cause a vacuum failure due to the pinhole generation of the outer packaging material 3. Therefore, according to the vacuum heat insulating material 1 of the first embodiment, the second adsorbent 50 having a large particle size is not in direct contact with the outer packaging material 3, thereby suppressing the generation of pinholes at the time of vacuum sealing. be able to.

<Example 2>
Example 2 is a test on the adsorption rate of the vacuum heat insulating material 1 of the first embodiment.

  The configuration of the vacuum heat insulating material 1 of Embodiment 1 was the same as that of Example 1. The configuration of the vacuum heat insulating material of the comparative example has a laminated film having the same configuration as that of the outer packaging material 3 as a protective sheet between the outer packaging material 3 and the first adsorption member 4 in the vacuum heat insulating material 1 of the first embodiment. The first adsorbing member 4 and the second adsorbing member 5 and the outer packaging material 3 are not directly in contact with each other.

  The thermal conductivity of the vacuum heat insulating material immediately after producing the vacuum heat insulating material 1 of this Embodiment 1 and the vacuum heat insulating material of a comparative example was all equivalent to 1.8 mW / (m · K). After that, when these vacuum heat insulating materials are stored for 30 days in an environment of an air temperature of 25 ° C. and a relative humidity of 60%, the increase in thermal conductivity is 0.4 mW / (m · K) in the vacuum heat insulating material of the comparative example. On the other hand, in the vacuum heat insulating material 1 of Embodiment 1, it was 0.2 mW / (m · K).

  In the vacuum heat insulating material 1 of this Embodiment 1, it does not have the laminate film as a protective sheet used with the vacuum heat insulating material of a comparative example, and the 2nd adsorption member 5 is the 1st adsorption member 4 And surrounded by the core material 2. Therefore, the ventilation of the second adsorption member 5 is not hindered. Therefore, in this Embodiment 1, since the adsorption | suction speed | rate of the heat conductive gas in the vacuum heat insulating material 1 does not fall, the vacuum heat insulating material 1 which can maintain heat conductivity low over a long period of time can be obtained.

<Example 3>
Example 3 is a test of the adsorption rate when the moisture adsorption rate of the second adsorbent 50 is four times that of the first adsorbent 40 in the vacuum heat insulating material 1 of the first embodiment.

  In the vacuum heat insulating material 1 of this Embodiment 1, the 2nd adsorption agent 50 is made into quick lime (calcium oxide) whose particle size is 3 mm on average and whose moisture adsorption speed is 4 times the 1st adsorption agent 40. Except for the configuration, the configuration is the same as in Examples 1-2. The thermal conductivity of the vacuum heat insulating material 1 immediately after producing the vacuum heat insulating material 1 of Embodiment 1 was 1.8 mW / (m · K). Thereafter, the amount of increase in thermal conductivity when the vacuum heat insulating material 1 of Embodiment 1 was stored for 30 days in an environment of an air temperature of 25 ° C. and a relative humidity of 60% was 0.1 mW / (m · K). It was.

  Therefore, according to the vacuum heat insulating material 1 of the first embodiment, the heat conduction gas adsorption rate of the second adsorbent 50 is made higher than the adsorption rate of the first adsorbent 40, so that heat can be generated over a long period of time. The vacuum heat insulating material 1 which can maintain a conductivity further low can be obtained.

Embodiment 2. FIG.
Below, the vacuum heat insulating material 1 which concerns on Embodiment 2 of this invention is demonstrated. FIG. 2 is a cross-sectional view showing a schematic configuration of the vacuum heat insulating material 1 according to Embodiment 2 of the present invention.

  In the vacuum heat insulating material 1 of this Embodiment 2, when the surface area of the 2nd packaging material 51 is made larger than the surface area of the 1st packaging material 41 (for example, in the surface orthogonal to the thickness direction of the vacuum heat insulating material 1). Consider a case in which the length and width of the second packaging material 51 are made 10 mm larger than the first packaging material 41). In the second embodiment, the amount of heat conduction gas passing through the second packaging material 51 is increased by increasing the surface area of the second packaging material 51. Therefore, similarly to Example 3 of the first embodiment described above, the adsorption rate of the heat conduction gas of the second adsorbent 50 can be made higher than the adsorption rate of the heat conduction gas of the first adsorbent 40. Further, in the second embodiment, since the shape of the second packaging material 51 can be confirmed from the outside of the outer packaging material 3 at the time of vacuum sealing, it is possible to confirm that the second suction member 5 has been forgotten to be inserted.

Embodiment 3 FIG.
Below, the vacuum heat insulating material 1 which concerns on Embodiment 3 of this invention is demonstrated. FIG. 3 is a cross-sectional view showing a schematic configuration of the vacuum heat insulating material 1 according to Embodiment 3 of the present invention.

  In the vacuum heat insulating material 1 according to the third embodiment, the second adsorbing member 5 does not have the second packaging material 51, that is, the second adsorbent 50 is exposed, and the first adsorbing member 4 and the core are exposed. Consider the case of being surrounded by material 2. In the third embodiment, since the second adsorbing member 5 does not have the second packaging material 51, the heat conduction gas in the second adsorbent 50 (for example, water, nitrogen, oxygen, carbon dioxide, etc.). The adsorption speed increases as compared with the case of being covered with the second packaging material 51. Therefore, similarly to Example 3 of the first embodiment described above, the adsorption rate of the heat conduction gas of the second adsorbent 50 can be made higher than the adsorption rate of the heat conduction gas of the first adsorbent 40.

Embodiment 4 FIG.
A heat insulation box 100 according to Embodiment 4 of the present invention will be described. In the fourth embodiment, by using the vacuum heat insulating material 1 according to the above-described first embodiment for the heat insulation box 100, the heat insulation box 100 which has high durability, can be used for a long period of time, and is inexpensive. Can be obtained. FIG. 4 is a cross-sectional view illustrating a schematic configuration of the heat insulation box 100 according to the fourth embodiment. In the fourth embodiment, a heat insulating box 100 of a refrigerator will be described as an example.

  As shown in FIG. 4, the heat insulating box 100 has an inner box 110 and an outer box 120. The vacuum heat insulating material 1 is disposed in the space between the inner box 110 and the outer box 120. The vacuum heat insulating material 1 is disposed in close contact with the outer wall surface of the inner box 110, for example. In the space between the inner box 110 and the outer box 120, a portion other than the vacuum heat insulating material 1 is filled with a urethane foam heat insulating material 130. Since the other part of the heat insulation box 100 is the same as that of a general refrigerator heat insulation box, its illustration and description are omitted.

  In the fourth embodiment, since the vacuum heat insulating material 1 that has high durability, can be used for a long time, and is inexpensive is used, the durability is high, it can be used for a long time, and is inexpensive. The heat insulation box 100 can be obtained. Moreover, in this Embodiment 4, since the vacuum heat insulating material 1 which has high heat insulation performance compared with the urethane foam heat insulating material 130 grade | etc., Is used, the heat insulation box which used only the urethane foam heat insulating material as a heat insulating material, In comparison, the heat insulation box 100 with high heat insulation performance can be obtained. Therefore, power consumption can be reduced in the refrigerator provided with the heat insulating box 100.

  In the heat insulating box 100 of the fourth embodiment, the vacuum heat insulating material 1 is in close contact with the outer wall surface of the inner box 110, but the vacuum heat insulating material 1 may be in close contact with the inner wall surface of the outer box 120. Moreover, the vacuum heat insulating material 1 may be arrange | positioned so that it may not contact | adhere to any of the inner box 110 and the outer box 120 in the space between the inner box 110 and the outer box 120 by using a spacer etc. .

Other embodiments.
The present invention is not limited to the above-described embodiment, and various modifications can be made.

  For example, in the manufacturing process of the vacuum heat insulating material 1 according to Embodiment 1 described above, the core material 2 and the outer packaging material 3 are dried by heat treatment at 100 ° C. for 2 hours. The time is not limited to this as long as the temperature and time allow the moisture of the core material 2 and the outer packaging material 3 to be removed.

  The core material 2 and the outer packaging material 3 are dried in a state where the core material 2 is covered with the outer packaging material 3. However, after the core material 2 and the outer packaging material 3 are separately dried, the core material 2 is encapsulated. You may coat | cover with the material 3. FIG.

  Moreover, in the manufacturing process of the vacuum heat insulating material 1 which concerns on the above-mentioned Embodiment 1, after drying the core material 2 and the outer packaging material 3, the 1st adsorption | suction member 4 and the 2nd adsorption member 5 are the core material 2 and an outer packaging. The first adsorbing member 4 and the second adsorbing member 5 may be arranged before the core material 2 and the outer packaging material 3 are dried.

  In Examples 1 to 3 of the first embodiment, the first wrapping material 41 and the second wrapping material 51 are made of a laminated material (laminated film) of paper and a polyethylene film. Alternatively, other breathable members such as a plastic film other than a polyethylene film, or a mesh cloth may be used. By configuring the first packaging material 41 and the second packaging material 51 using members having better air permeability than paper or polyethylene film, the second adsorption is performed in the same manner as in Example 3 of the first embodiment. The adsorption rate of the heat conduction gas of the agent 50 can be made higher than the adsorption rate of the heat conduction gas of the first adsorbent 40.

  Moreover, in the above-mentioned Embodiment 4, although the structure in which the vacuum heat insulating material 1 was used for the heat insulation box 100 of the refrigerator provided with a cold heat source was mentioned as an example, this invention is not limited to this. The vacuum heat insulating material 1 can also be used for a heat insulating box with a heat source or a heat insulating box without a cold heat source and a heat source (for example, a cooler box).

  Moreover, the vacuum heat insulating material 1 can also be used as a heat insulating member for not only the heat insulating box 100 but also a cooling device or a heating device such as an air conditioner, a vehicle air conditioner, or a water heater. Moreover, the vacuum heat insulating material 1 can be used not only for a box having a predetermined shape like a heat insulating box, but also for a heat insulating bag including a deformable outer bag and an inner bag, and other heat insulating containers. .

  In addition, the above-described embodiments and modifications can be implemented in combination with each other.

  DESCRIPTION OF SYMBOLS 1 Vacuum heat insulating material, 2 core material, 3 outer packaging material, 1st adsorption member, 5 2nd adsorption member, 40 1st adsorption agent, 41 1st packaging material, 50 2nd adsorption agent, 51 1st adsorption agent 2 packaging materials, 100 heat insulation box, 110 inner box, 120 outer box, 130 urethane foam heat insulation material.

Claims (10)

A core that holds the vacuum space;
An outer packaging material covering the core material;
A first adsorbent having a powder-form first adsorbent and a first packaging material covering the first adsorbent, and arranged in contact with an inner surface of the outer packaging material;
A vacuum heat insulating material comprising a second adsorbent having a particle size larger than that of the first adsorbent, and comprising the first adsorbing member and a second adsorbing member surrounded by the core material.   2. The vacuum heat insulating material according to claim 1, wherein the first adsorbent has an average particle size of less than 0.1 mm and the second adsorbent has an average particle size of 0.1 mm to 100 mm.   The vacuum heat insulating material according to claim 1 or 2, wherein an adsorption rate of the heat conduction gas in the second adsorption member is larger than an adsorption rate of the heat conduction gas in the first adsorption member.   The first packaging material is a breathable member selected from the first group consisting of paper, non-woven fabric, plastic film, and mesh-like cloth, or two or more types selected from the first group The vacuum heat insulating material as described in any one of Claims 1-3 which consists of a laminated material which has the air permeability which laminated | stacked the member.   The second adsorbing member has a second packaging material that covers the second adsorbent, and the surface area of the second packaging material is larger than the surface area of the first packaging material. The vacuum heat insulating material according to any one of claims 1 to 4.   The second packaging material is a breathable member selected from the second group consisting of paper, non-woven fabric, plastic film, and mesh cloth, or two or more types selected from the second group The vacuum heat insulating material according to claim 5, wherein the vacuum heat insulating material is made of a laminated material having air permeability in which members are laminated.   The vacuum heat insulating material according to any one of claims 1 to 4, wherein the second adsorbing member does not include a packaging material that covers the second adsorbent.   The vacuum heat insulating material according to any one of claims 1 to 7, wherein the core material is a fiber assembly.   The vacuum heat insulating material according to claim 8, wherein the fiber assembly is glass wool.   A heat insulation box provided with the vacuum heat insulating material as described in any one of Claims 1-9.

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