JP2006084077A - Vacuum heat insulating material and refrigerator using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum heat insulating material and a refrigerator capable of securing reliability by reducing time degradation of heat insulating performance when the vacuum heat insulating material is used in a housing, with respect to the vacuum heat insulating material and the refrigerator using the same. <P>SOLUTION: In this refrigerator wherein the vacuum heat insulating material 30 having a core material 31 composed of a fiber material laminated body, an outer wrapping material covering the core material 31 and composed of a plurality of layers, and an adsorbing material mounted inside of the outer wrapping material, is attached to one of an outer plate 11 and an inner plate 12 between the outer plate 11 and the inner plate 12 of a heat insulating housing to form a heat insulating part with urethane foam mounted between the outer plate 11 and the inner plate 12, the outer wrapping material has a plurality of deposited layers formed by metal deposition on a base material composed of resin in such a state that the plurality of deposited layers are overlapped and stacked to be oppositely kept into contact with each other. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vacuum heat insulating material and a refrigerator using the vacuum heat insulating material.

  In the heat insulating box of the refrigerator, a heat insulating material provided with a vacuum heat insulating material having high heat insulating performance in addition to the foam heat insulating material is increasing. There exists a thing of patent document 1 as a vacuum heat insulating material used for such a refrigerator. In Patent Document 1, an exterior material made of a gas barrier film is composed of at least two surfaces consisting of a laminate film laminated with metal foil and a laminate film not laminated with metal foil. In this example, the heat leakage problem is improved by improving the heat leak problem.

  In addition, as in Patent Document 2, at least two layers of aluminum deposited film, an aluminum foil is sandwiched between the laminated films, and the aluminum foil is removed by etching so that it does not cover the seal part. An example is described in which the heat bridge is reduced and the gas barrier property is enhanced to improve the heat insulation performance.

  Moreover, as a conventional system regarding the vacuum heat insulating material used for the rice cooker, as described in Patent Document 3, a vapor deposition layer obtained by performing metal vapor deposition or metal oxide vapor deposition on a substrate made of an organic film as a gas barrier layer is 1 As a laminated film using a single layer or a plurality of layers, heat leak is reduced as well as gas barrier properties, and heat insulation performance is improved. In addition, by providing a heat-resistant protective layer as the surface layer of the laminate film, performance deterioration due to heat has been suppressed.

Japanese Patent Laid-Open No. 11-336991 (FIG. 1) JP 2001-32992 A (FIG. 1) Japanese Patent Laid-Open No. 2001-204620 (FIG. 2)

  In the configuration of Patent Document 1 described above, a laminate film having a metal foil on one side is used. However, when used in a refrigerator or the like, a heat seal that is a ridge line portion of the outer packaging material so as not to hinder the flow of foamed urethane. Even if the metal foil layer is removed from the single-sided laminate film because the part is bent at least one side, the effect of the heat bridge is reduced, but heat remains on the surface of the vacuum heat insulating material by the metal foil layer remaining on one side. The effect of the heat bridge that flows laterally along the side is still large, and heat builds up in the doubled part of the metal foil layer by bending, increasing the temperature of the surface of the vacuum insulation material. There was a lack of improvement.

  In addition, as described in Patent Document 2, for an aluminum foil layer laminated in a size that does not cover the seal part between two deposited layers of the laminate film, the aluminum foil is subjected to an etching process after the lamination. Although it is removed, due to the high processing cost and the difference in thickness between the part where the aluminum foil was removed and the remaining part, that is, the boundary part between the vapor deposited layer 2 layer + aluminum foil part and the vapor deposited layer 2 layer only, There were problems in terms of reliability, such as air bubbles in the film during lamination.

  In addition, a heat-resistant protective layer is disposed on the surface layer of the laminate film, and one or a plurality of vapor-deposited layers obtained by performing metal vapor deposition or metal oxide vapor deposition on a substrate made of an organic film as a gas barrier layer is used. However, the heat resistance in the temperature range around 85 ° C. was considered, but the temperature range higher than that was not considered. That is, when the vacuum heat insulating material is disposed in the heat insulating portion between the outer plate and the inner plate, the vacuum heat insulating material is bonded to the outer plate or the inner plate, and the urethane is interposed between the outer plate and the inner plate. However, the heat resistance against a temperature of 120 to 150 ° C., which is the temperature reached by the placement part of the vacuum heat insulating material at the time of foaming, was not taken into consideration. Moreover, the structure of each layer with respect to piercing was not considered.

  The present invention has been made in view of the above problems, and relates to a vacuum heat insulating material and a refrigerator using the vacuum heat insulating material. When the vacuum heat insulating material is used for a box, the heat insulating performance is reduced over time, and is reliable. It aims at providing the vacuum heat insulating material and refrigerator which ensured the property.

  In order to achieve the above object, a vacuum heat insulating material comprising a core material made of a fiber material laminate, an outer packaging material covering the core material and made of a plurality of layers, and an adsorbent provided inside the outer packaging material, In a refrigerator that is affixed to one of the outer plate or the inner plate between the outer plate and the inner plate of the heat insulating box and forms a heat insulating portion together with urethane foam provided between the outer plate and the inner plate In the present invention, the outer packaging material includes a plurality of base materials each having a vapor deposition layer on which a metal is vapor-deposited, and the plurality of base materials are laminated so that the vapor deposition layers face each other.

Moreover, the outer packaging material located on the side of the surface to be attached to the outer plate or the inner plate of the vacuum heat insulating material has a vapor deposition layer by metal vapor deposition on a substrate made of resin,
The surface opposite to the affixing surface is provided in contact with the urethane foam, and the outer packaging material of the surface in contact with the urethane foam has at least two or more vapor deposition layers by metal vapor deposition on a base material made of resin,
The metal foil layer having a thickness of 1 μm or more was not provided on both the affixing surface and the surface in contact with the urethane foam.

  The vapor deposition layer was aluminum and the vapor deposition thickness was 400 mm or more.

  Moreover, the outer packaging material which has the vapor deposition layer by the side of the sticking surface of the said vacuum heat insulating material decided to adhere | attach on the outer plate inner surface. Moreover, the outer packaging material which has the vapor deposition layer by the side of the sticking surface of the said vacuum heat insulating material decided to adhere | attach on the resin surface of the inner-plate surface.

  The base material of the vapor deposition layer on the application surface of the vacuum heat insulating material is a gas barrier resin film, and the gas barrier resin film is a polyamide resin film (PA), a polypropylene resin film (PP), an ethylene vinyl alcohol copolymer resin film. (EVOH), polyvinyl alcohol resin film (PVA), polyethylene terephthalate resin film (PET), or polyacrylonitrile resin film (PAN).

  Further, the base material of the vapor deposition layer on the surface in contact with the urethane foam on the side opposite to the surface to which the vacuum heat insulating material is applied is a gas barrier resin film, and the gas barrier resin film is a polyamide resin film (PA), a polypropylene resin film ( One or more of PP), ethylene vinyl alcohol copolymer resin film (EVOH), polyvinyl alcohol resin film (PVA), polyethylene terephthalate resin film (PET), polyacrylonitrile resin film (PAN) It was.

  Moreover, when the said vapor deposition layer was comprised by two or more layers, the two layers laminated the vapor deposition surfaces.

Further, the outer packaging material in contact with the urethane foam, from the outer layer side, the first layer is a layer of polyamide (nylon) resin (PA) or polyethylene terephthalate resin (PET),
The second layer is polyamide resin film (PA), polypropylene resin film (PP), ethylene vinyl alcohol copolymer resin film (EVOH), polyvinyl alcohol resin film (PVA), polyethylene terephthalate resin film (PET), polyacrylonitrile resin A layer consisting of one of the films (PAN),
The third layer is polyamide resin film (PA), polypropylene resin film (PP), ethylene vinyl alcohol copolymer resin film (EVOH), polyvinyl alcohol resin film (PVA), polyethylene terephthalate resin film (PET), polyacrylonitrile resin A layer consisting of one of the films (PAN),
A layer in which the fourth layer, which is the innermost layer, is a high-density polyethylene resin (HDPE) or a heat-weldable resin film,
The second layer and the third layer were laminated on the surfaces on which aluminum was vapor-deposited.

  As the adsorbent, molecular sieve 13X was used.

Further, the vacuum heat insulating material of the present invention includes a core material made of a fiber material laminate, an outer packaging material having a gas barrier property and covering the core material, and comprising a plurality of layers, and an adsorbent provided inside the outer packaging material. Have
The outer packaging material has a plurality of vapor deposition layers formed by metal vapor deposition on a base material made of resin as a gas barrier layer, and the plurality of vapor deposition layers are stacked so as to face each other so as to face each other.

  In the present invention, since any one of the above-described configurations is adopted, it becomes possible to further improve the influence of the heat bridge, and a laminate film configuration that can compensate for long-term deterioration of the heat insulation performance or It is possible to provide a vacuum heat insulating material and a refrigerator using the vacuum heat insulating material that also ensure the reliability against piercing.

  ADVANTAGE OF THE INVENTION According to this invention, the time-dependent deterioration of heat insulation performance can be reduced, and the vacuum heat insulating material and refrigerator which ensured reliability can be provided.

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

  1 is a longitudinal cross-sectional view of the main part of the refrigerator showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of the main part of the AA line in FIG. 1, FIG. 3 is a cross-sectional view of the main part of the BB line in FIG. It is. FIG. 2 shows the main part of the vacuum heat insulating material 30 located in the heat insulating part on the upper surface of the refrigerator, and in this embodiment, the vacuum heat insulating material 30 at the upper surface position is arranged so as to contact the outer plate as described later. However, it does not exclude the arrangement on the inner plate side. FIG. 3 shows the main part of the vacuum heat insulating material located in the heat insulating part on the bottom surface of the refrigerator, and in this embodiment, the vacuum heat insulating material at the bottom surface position is arranged so as to contact the inner plate as described later. However, it is not limited to this.

  As shown in FIG. 1, the refrigerator according to the present embodiment has a refrigerator box 10 and a refrigerator temperature chamber 14 and a refrigeration temperature chamber 15 that are partitioned. The refrigerator box 10 includes an outer plate 11 and an inner box 12, and insulates each storage chamber in the box 10 from the outside with a space formed by the outer plate 11 and the inner box 12 as a heat insulating portion. . Vacuum heat insulating materials 30 and 40 are attached to the outer plate 11 side and the inner box 12 side, respectively, and the spaces other than the vacuum heat insulating materials 30 and 40 are filled with the foam heat insulating material 13.

  Further, in order to cool each storage chamber in the refrigerator to a predetermined temperature, a cooler 18 is provided on the back side of the freezing temperature chamber 15, and a condenser (not shown) including the cooler 18 and the compressor 20 is provided. The capillary tube is connected to form a refrigeration cycle. Above the cooler 18, a blower 16 that circulates the cool air cooled by the cooler 18 in the refrigerator cabinet and maintains a predetermined low temperature is disposed. The blower 16 is connected to a wiring cord 17, and the wiring cord 17 is located in the heat insulating portion.

  As shown in FIGS. 2 and 3, the vacuum heat insulating materials 30 and 40 are composed of core materials 31 and 41 and outer packaging materials 33 and 43 having a gas barrier layer covering the core materials 31 and 41. The outer packaging materials 33 and 43 are formed in a bag-making shape in which two outer packaging material films 35 and 45 that are in contact with urethane are bonded to the outer packaging material films 34 and 44 that are the bonding surfaces of the vacuum heat insulating materials 30 and 40. Yes. In this embodiment, a fiber material laminate is used for the core materials 31 and 41. However, the core materials 31 and 41 are not limited to a fiber material laminate, and may be a known material such as continuous urethane, and are not particularly limited. However, in a vacuum heat insulating material formed in a panel shape, in order to further reduce the heat conduction in the panel thickness direction, it is advantageous to use a laminate of inorganic fiber materials having the same fiber length direction.

  In the present embodiment, the vacuum heat insulating material used in the refrigerator is a panel-like one formed in a plate shape, and the core materials 31 and 41 are made of a laminate of inorganic fiber materials, which will be described below.

  The vacuum heat insulating materials 30 and 40 used in the refrigerator are composed of core materials 31 and 41 made of a fiber material laminate, an outer packaging material and an adsorbing material, and the outer packaging material is a vacuum thermal insulation in consideration of heat bridge reduction and gas barrier properties. The outer packaging materials 34 and 44 to be the application surfaces to which the materials 30 and 40 are attached are laminated films provided with at least one vapor deposition layer subjected to metal vapor deposition. A hot-melt adhesive 50 is applied to the entire surface of the vacuum heat insulating materials 30 and 40 and the outer plate 11 or the inner plate 12, and the vacuum heat insulating material is attached. Therefore, the affixing surface (adhesive surface affixed by the adhesive 50) does not touch the air and the urethane foam, and is sufficient for barriering the gas and moisture entering from the adhesive surface.

  The outer packaging material on the surface in contact with the foam insulation material 13 such as urethane opposite to the bonding surface of the vacuum insulation materials 30 and 40 is equipped with multiple base materials with a metal layer formed on one side to prevent intrusion of gas generated from urethane. The metal surfaces of these base materials are stacked to face each other. For example, in this embodiment, gas barrier properties are sufficiently secured as the laminate films 35 and 45 provided with at least two vapor-deposited layers subjected to metal vapor deposition. Since the outer packaging material on the adhesive surface and the surface in contact with urethane does not have a metal foil layer, there is less heat bridge through which heat flows along the surfaces of the vacuum heat insulating materials 30 and 40, improving heat insulation performance and improving gas barrier properties. It is possible to provide a refrigerator using a highly reliable vacuum heat insulating material.

  Further, by setting the vapor deposition thickness of the metal vapor deposition layer to 400 mm or more, it is possible to effectively barrier the gas entering from the adhesion surface of the vacuum heat insulating materials 30 and 40 and the urethane buried surface.

  When the vacuum heat insulating material 30 is bonded to the outer plate 11, the laminate film 34 including at least one layer of metal vapor deposition, which is the bonding surface of the vacuum heat insulating material 30, is adhered and held on the inner surface of the outer box iron plate 11. Since the adhesion surface does not come into contact with the air layer or the urethane due to the entire surface adhesion, an arrangement structure in which gas intrusion is difficult even if the vapor deposition layer is one layer.

  In addition, when selling the vacuum heat insulating material 40 to the inner plate 12, the laminate film 44 including at least one layer of metal deposition, which is the bonding surface of the vacuum heat insulating material 40, holds the entire bonding surface bonded to the outer surface of the inner box resin 12. Since the adhesion surface does not come into contact with the air layer or urethane due to the entire surface adhesion, the arrangement structure is such that gas does not easily enter even if the vapor deposition layer is a single layer.

  According to the above configuration, in the vacuum heat insulating materials 30 and 40, the high gas barrier close to the metal foil can be obtained by configuring the films 35 and 45 with the double deposited layer on the surface in contact with the urethane that requires high gas barrier properties. Therefore, it is possible to provide a refrigerator in which a vacuum heat insulating material excellent in reliability and heat insulating performance is provided, which can secure the property and reduce the heat bridge.

  Further, in the present embodiment, the base material of the laminate films 34 and 44 including at least one metal vapor deposition which is an adhesion surface of the vacuum heat insulating materials 30 and 40 is formed of a gas barrier resin film, and the gas barrier resin film is a polyamide resin. Film (PA), polypropylene resin film (PP), ethylene vinyl alcohol copolymer resin film (EVOH), polyvinyl alcohol resin film (PVA), polyethylene terephthalate resin film (PET), polyacrylonitrile resin film (PAN) The refrigerator is characterized by using a vacuum heat insulating material. Among these gas barrier resin films, ethylene vinyl alcohol copolymer resin film (EVOH) and polyethylene terephthalate resin film (PET) are preferable, and deterioration is minimized by metal deposition on a substrate with low oxygen permeability. Since it can suppress, the refrigerator with little power consumption can be implement | achieved.

  In addition, the base material of the laminate films 35 and 45 including at least two layers of metal vapor deposition, which are the surfaces embedded in the urethane of the vacuum heat insulating materials 30 and 40, is made of a gas barrier resin film, and the gas barrier resin film is a polyamide resin film (PA ), Polypropylene resin film (PP), ethylene vinyl alcohol copolymer resin film (EVOH), polyvinyl alcohol resin film (PVA), polyethylene terephthalate resin film (PET), or polyacrylonitrile resin film (PAN) It is a refrigerator characterized by using a vacuum heat insulating material, and preferably one or both of an ethylene vinyl alcohol copolymer resin film (EVOH) and a polyethylene terephthalate resin film (PET) are used. As described above, metal deposition on a substrate having low oxygen permeability Ri since it is possible to minimize the deterioration of the long-term, it is possible to realize a small refrigerator of power consumption.

  In addition, when the vapor deposition layer is composed of two or more layers, at least two of them are formed as a vacuum heat insulating material in which the vapor deposition surfaces are laminated and laminated, so that pinholes in one vapor deposition layer or Since the deposition variation can be minimized by making it two layers, the gas barrier property is enhanced, deterioration over a long period can be minimized, and a refrigerator with low power consumption can be realized.

  In addition, the configuration of the laminate films 35 and 45 on the surface that contacts the urethane with the outer packaging material of the vacuum heat insulating materials 30 and 40 is a polyamide (nylon) resin (PA) or a polyethylene tertaflate resin (PET) as the first layer which is the outermost layer. ), Second layer is polyamide resin film (PA), polypropylene resin film (PP), ethylene vinyl alcohol copolymer resin film (EVOH), polyvinyl alcohol resin film (PVA), polyethylene terephthalate resin film (PET), polyacrylic A layer composed of any of the nitrile resin films (PAN), a polyamide resin film (PA) on which the third layer is vapor-deposited aluminum, a polypropylene resin film (PP), an ethylene vinyl alcohol copolymer resin film (EVOH), a polyvinyl alcohol Resin film (PVA), polyethylene terephthalate resin film (PET), polyacrylonitrile 4 layers of vacuum heat insulating material using high-density polyethylene resin (HDPE) or a heat-weldable resin film as the innermost layer, the fourth layer consisting of any resin film (PAN) The refrigerator is characterized in that, preferably, the first layer is a polyamide (nylon) resin (PA) 35a, 45a, the second layer is a polyethylene terephthalate resin film (PET) 35b, 45b, on which aluminum is deposited, the third layer It is preferable to use ethylene vinyl alcohol copolymer resin films (EVOH) 35c and 45c on which aluminum is vapor-deposited and the fourth layer as high-density polyethylene resins (HDPE) 35d and 45d.

  The reason is as follows. That is, since the first layer is the outermost layer, considering the heat resistance to a temperature of 120 to 150 ° C., which is the temperature reached by the vacuum heat insulating material disposition portion when filling the urethane foam liquid, the first layer is a heat resistant layer Good. Therefore, in this embodiment, the first layer is a heat resistant layer. In addition, since the first layer is the outermost layer, it is preferable that both the piercing strength and the heat resistance temperature are high in consideration of preventing damage to the film when the vacuum heat insulating materials 30 and 40 are handled. Therefore, in this embodiment, the polyamide (nylon) resin layer is used in consideration of them.

  The second and third layers are laminated between aluminum-deposited surfaces and placed in the middle to suppress pinholes in the vapor deposition layer and variations in vapor deposition, and to enhance the gas barrier properties and to the vapor deposition layer from the outside. It also has the effect of making it difficult to receive damage. In addition, by placing ethylene vinyl alcohol copolymer resin (EVOH) in the third layer, it has a structure that can sufficiently withstand piercing from the inside in addition to gas barrier properties, and is highly reliable A refrigerator using a vacuum heat insulating material can be provided.

  Since the fourth layer is welded as a surface facing each other with the core materials 31 and 41 interposed therebetween, it is preferable to use high density polyethylene resin (HDPE) as the welded layer.

  In addition, the molecular sieve 13X is used as the adsorbent, so that the moisture retained by the core materials 31 and 41 and the slight gas components generated depending on the temperature conditions received by the outer packaging material can be sufficiently adsorbed at a high adsorption rate, so the initial performance is stable. Since the effect and long-term deterioration can be minimized, a refrigerator with low power consumption can be realized.

  As described above, the outer packaging material used as the bonding surface of the vacuum heat insulating materials 30 and 40 is provided with at least one vapor-deposited layer subjected to metal vapor deposition, and in the urethane foam opposite the bonding surface of the vacuum heat insulating materials 30 and 40. In order to prevent the gas generated from urethane from entering, the outer packaging material embedded in the surface has at least two vapor-deposited layers subjected to metal vapor deposition, and both sides do not have a metal foil layer. Thus, it is possible to provide a refrigerator using the highly reliable vacuum heat insulating materials 30 and 40, which are less affected by a heat bridge in which heat flows along the surface, improves heat insulation performance, and has excellent gas barrier properties.

  In addition, the vapor deposition layer is formed by vapor-depositing aluminum, and by setting the vapor deposition thickness to 400 mm or more, pinholes in the vapor deposition layer can be reduced, and a refrigerator using the vacuum heat insulating materials 30 and 40 having high gas barrier properties is provided. Can be provided.

  In addition, the outer packaging material film on the side to be the bonding surface of the vacuum heat insulating materials 30 and 40 is the inner surface of the outer box iron plate of the refrigerator, that is, the surface forming the heat insulating portion of the outer plate 11, or the outer resin surface of the inner box of the refrigerator, Since it is affixed and held on the surface of the plate 12 forming the heat insulating portion, gas intrusion from the affixing surface side is suppressed, and a highly reliable refrigerator can be provided.

  The heat insulation performance due to the difference in the configuration of the outer packaging material films 34 and 44 on the bonding surface side of the vacuum heat insulating materials 30 and 40 and the outer packaging material films 35 and 45 on the surface in contact with urethane will be described in each embodiment described later.

  The evaluation of the heat insulation performance in the difference in the film composition is based on the initial heat conductivity of the vacuum heat insulating material and the heat conductivity after standing for 10 years in a 70 ° C atmosphere. Check. Ideally, the difference between the initial thermal conductivity and the thermal conductivity value after 10 years is small.

  As an assumption evaluation of the built-in refrigerator, the same iron plate as the outer plate 11 used in the refrigerator box 10 and the same resin plate as the inner box 12 are held in parallel at a certain interval, and either the iron plate or the resin plate The heat insulation performance is clarified by actually measuring and evaluating the initial amount of heat leakage with a foam heat insulation panel (not shown) filled with urethane foam by adhering and holding a vacuum heat insulating material. The reliability of long-term insulation performance is confirmed by leaving the foam insulation panel with vacuum insulation in a 70 ° C atmosphere and confirming the amount of heat leakage after 10 years.

  In the first embodiment of the present invention, as shown in FIG. 4, the outer packaging material films 34, 44 on the bonding surface side of the vacuum heat insulating materials 30, 40 are composed of a polyamide (nylon) layer 34a, the first layer from the outermost layer. 44a, polyethylene terephthalate resin (PET) layers 34b, 44b, in which aluminum is deposited in a thickness of 400 to 500 mm, and the second layer is an ethylene vinyl alcohol copolymer film (EVOH), in which aluminum is deposited in a thickness of 400 to 500 mm ) Layers 34c and 44c, and the fourth layer, the high-density polyethylene resin layers 34d and 44d, are laminated films of four layers, and the middle two layers on which aluminum is vapor-deposited are vapor-deposited with aluminum in order to enhance gas barrier properties. It was set as the laminate film which bonded the surfaces together.

  In addition, the outer packaging films 35 and 45 on the surface of the vacuum heat insulating materials 30 and 40 that are in contact with urethane, the outermost layer, the first layer is a polyamide (nylon) layer 35a, 45a, the second layer is aluminum with a thickness of 400 to 500 mm Polyethylene terephthalate resin (PET) layers 35b and 45b, vapor-deposited at a thickness of 400 to 500 mm, and an ethylene vinyl alcohol copolymer film (EVOH) layer 35c, 45c, and a fourth layer as a weld layer. Is a laminated film having a four-layer structure of high-density polyethylene resin layers 35d and 45d, and the intermediate two layers on which aluminum is vapor-deposited are laminated films in which aluminum vapor-deposited surfaces are bonded together in order to improve gas barrier properties.

  In addition, the vacuum heat insulating material used here uses a glass wool laminate having an average fiber diameter of 4 μm, which does not contain a binder in the core material, solidified with an inorganic binder, and the adsorbent is a molecular sieve 13X, outer packaging material films 34, 44 and 35. After the core material is inserted into the bag-made product consisting of 45, the vacuum degree is maintained at a pressure of 2.0 Pa or less for a certain period of time and sealed with a vacuum packaging machine.

  When the heat conductivity of this vacuum heat insulating material was measured with a heat conductivity measuring device Auto λHC-074 manufactured by Eiko Seiki Co., Ltd., a good initial value of 1.7 to 2.0 mW / m · K was obtained. The thermal conductivity after 10 years in a 70 ° C atmosphere was 9 to 10 mW / m · K. Also, in the evaluation of the amount of heat leakage in the foam insulation panel, if the heat leakage amount of the reference panel for urethane only that does not incorporate the vacuum insulation material is 100, the vacuum insulation material is held on either the iron plate side or the resin plate side. The initial value is 81 and 91 after 10 years, which is about 12% worse. However, the heat insulation effect of the vacuum heat insulating material is fully exhibited even after 10 years.

  In the second embodiment of the present invention, as shown in FIG. 5, the outer packaging films 34, 44 on the bonding surface side of the vacuum heat insulating materials 30, 40 are formed from the outermost layer, the first layer being a polyamide (nylon) layer 34a, 44a, the second layer is a polyethylene terephthalate resin (PET) layer 34e, 44e, the third layer is an ethylene vinyl alcohol copolymer film (EVOH) layer 34c, 44c, in which aluminum is deposited to a thickness of 400 to 500 mm, the fourth layer One welded layer was a laminated film having a four-layer structure of high density polyethylene resin layers 34d and 44d.

  In addition, the outer packaging films 35 and 45 on the surface of the vacuum heat insulating materials 30 and 40 that are in contact with urethane, the outermost layer, the first layer is a polyamide (nylon) layer 35a, 45a, the second layer is aluminum with a thickness of 400 to 500 mm Polyethylene terephthalate resin (PET) layers 35b and 45b, vapor-deposited at a thickness of 400 to 500 mm, and an ethylene vinyl alcohol copolymer film (EVOH) layer 35c, 45c, and a fourth layer as a weld layer. Is a laminated film having a four-layer structure of high-density polyethylene resin layers 35d and 45d, and the intermediate two layers on which aluminum is vapor-deposited are laminated films in which aluminum vapor-deposited surfaces are bonded together in order to improve gas barrier properties.

  In addition, the vacuum heat insulating material used here uses a glass wool laminate having an average fiber diameter of 4 μm, which does not contain a binder in the core material, solidified with an inorganic binder, and the adsorbent is a molecular sieve 13X, outer packaging material films 34, 44 and 35. After the core material is inserted into the bag-made product consisting of 45, the vacuum degree is maintained at a pressure of 2.0 Pa or less for a certain period of time and sealed with a vacuum packaging machine.

  When the heat conductivity of this vacuum heat insulating material was measured with a heat conductivity measuring device Auto λHC-074 manufactured by Eiko Seiki Co., Ltd., a good value of 1.8 to 2.1 mW / m · K was obtained as an initial value. The thermal conductivity after 10 years in a 70 ° C atmosphere was 10 to 11 mW / m · K. In addition, in the heat leakage evaluation of the foam insulation panel, if the heat leakage amount of the urethane-only component panel that does not incorporate the vacuum insulation material is 100, the vacuum insulation material can be bonded to either the iron plate side or the resin plate side. The initial value is 81, and 92 after 10 years, which is about 13% worse, but the heat insulation effect of the vacuum heat insulating material is fully exhibited even after 10 years.

Comparative example

  Next, comparative examples for the examples are shown below.

  In the comparative example, as shown in FIG. 6, the outer packaging material films 34 and 44 on the bonding surface side of the vacuum heat insulating materials 30 and 40 are polyamide (nylon) layers 34a and 44a, and the second layer from the outermost layer. Polyethylene terephthalate resin (PET) layers 34b, 44b with aluminum deposited in a thickness of 400 to 500 mm, ethylene vinyl alcohol copolymer film (EVOH) layers 34c, 44c with aluminum deposited in a thickness of 400 to 500 mm, The fourth layer is a four-layer laminate film consisting of a weld layer and high-density polyethylene resin layers 34d and 44d. For the two intermediate layers on which aluminum is vapor-deposited, a laminate in which aluminum vapor-deposited surfaces are bonded together to improve gas barrier properties. A film was obtained.

  In addition, the outer packaging films 35 and 45 on the surface of the vacuum heat insulating materials 30 and 40 that are in contact with urethane, the outermost layer, the first layer is a polyamide (nylon) layer 35a, 45a, the second layer is aluminum with a thickness of 400 to 500 mm The polyethylene terephthalate resin (PET) layers 35b and 45b deposited in step 4a, the third layer are aluminum foil layers 35f and 45f, and the fourth layer is a laminated film having a four-layer structure of high-density polyethylene resin layers 35d and 45d. .

  The vacuum heat insulating material used here is a glass wool laminate with an average fiber diameter of 4 μm, which does not contain a binder, solidified with an inorganic binder, and the adsorbent is a molecular sieve 13X, outer packaging material films 34, 44 and 35, After the core material is inserted into the bag-made product consisting of 45, it is sealed by holding for a certain time at a vacuum degree of 2.0 Pa or less by a vacuum packaging machine.

  When the heat conductivity of this vacuum heat insulating material was measured with a heat conductivity measuring device Auto λHC-074 manufactured by Eiko Seiki Co., Ltd., a good value of 1.8 to 2.0 mW / m · K was obtained as an initial value. The thermal conductivity after a lapse of 10 years in a 70 ° C. atmosphere was a value of 7 to 8 mW / m · K, resulting in less deterioration than in Examples 1 and 2. In addition, in the evaluation of the amount of heat leakage in the foam insulation panel, when the amount of heat leakage of the urethane-only reference panel that does not incorporate the vacuum insulation material is 100, the vacuum insulation material is bonded to either the iron plate side or the resin plate side. Although the initial value is 90, it is about 96 after 10 years, and deterioration is suppressed to about 7%. However, as the heat insulation effect after 10 years, Examples 1 and 2 show the heat insulation effect. is doing.

  Comparing Example 1 and Example 2 with the comparative example, the degree of deterioration with time is about 7% in the comparative example, while Example 1 and Example 2 are about 12% and about 13 respectively. Although the thermal conductivity and the amount of heat leakage are better in each example both in the initial value and after the passage of 10 years, sufficient insulation performance is maintained even after the passage of 10 years. As a result, deterioration with time is reduced. That is, even if a metal foil layer is not used on the surface in contact with the urethane foam, by laminating the metal vapor deposition surfaces to face each other, it has a sufficient gas barrier property and is effective in preventing deterioration with time. Moreover, by not using a metal foil layer, it contributes also to reduction of a heat bridge and is effective in reducing the amount of heat leakage.

  Moreover, when Example 1 and Example 2 are compared, even if it does not have the bonding structure of metal vapor deposition layers on the bonding surface side with the outer plate 11 or the inner plate 12, a sufficient gas barrier property is maintained. You can see that

  It should be noted that when the vacuum heat insulating material of each example is disposed in the refrigerator, it is effective to use any of the examples, but the outer plate side is arranged at a higher temperature body than the inner plate side. In consideration of being installed and the values of the thermal conductivity and the amount of heat leakage described above, the ones of the embodiments may be mixed and pasted in one refrigerator. That is, the vacuum heat insulating material attached to the inner plate side and the vacuum heat insulating material attached to the outer plate side may be different from each other. For example, the vacuum heat insulating material to be applied to the outer plate side can be the same as that of Example 1, and the vacuum heat insulating material to be applied to the inner plate side can be the same as that of Example 2.

The longitudinal cross-sectional view of the principal part of the refrigerator which shows the Example of this invention. Sectional drawing of the principal part of the AA line in FIG. Sectional drawing of the principal part of the BB line in FIG. Sectional drawing of the vacuum heat insulating material in a 1st Example. Sectional drawing of the vacuum heat insulating material in a 2nd Example. Sectional drawing of the vacuum heat insulating material in a comparative example.

Explanation of symbols

11 ... outer plate, 12 ... inner plate, 30 (40) ... vacuum heat insulating material, 31 (41) ... core material, 33 (43) ... outer packaging material, 50 ... adhesive.

Claims (11)

A vacuum heat insulating material having a core material made of a fiber material laminate, an outer packaging material that covers the core material and that has a plurality of layers, and an adsorbent that is provided inside the outer packaging material, and an inner plate of the heat insulation box In a refrigerator that is affixed to one of the outer plate or the inner plate with a plate, and forms a heat insulating portion together with urethane foam provided between the outer plate and the inner plate,
The said outer packaging material is provided with the some base material which has the vapor deposition layer which vapor-deposited the metal, and laminated | stacked these some base materials so that the said vapor deposition layers may oppose. A vacuum heat insulating material having a core material made of a fiber material laminate, an outer packaging material that covers the core material and that has a plurality of layers, and an adsorbent that is provided inside the outer packaging material, and an inner plate of the heat insulation box In a refrigerator that is affixed to one of the outer plate or the inner plate with a plate, and forms a heat insulating portion together with urethane foam provided between the outer plate and the inner plate,
The outer packaging material located on the side of the surface to be attached to the outer plate or the inner plate of the vacuum heat insulating material has a vapor deposition layer by metal vapor deposition on a substrate made of resin,
The surface opposite to the affixing surface is provided in contact with the urethane foam, and the outer packaging material of the surface in contact with the urethane foam has at least two or more vapor deposition layers by metal vapor deposition on a base material made of resin,
2. A refrigerator, wherein a metal foil layer having a thickness of 1 μm or more is not provided on both the affixing surface and the surface in contact with the urethane foam.   The refrigerator according to claim 1 or 2, wherein the vapor deposition layer is aluminum and the vapor deposition thickness is 400 mm or more.   The refrigerator according to any one of claims 1 to 3, wherein an outer packaging material having a vapor deposition layer on the attachment surface side of the vacuum heat insulating material is bonded to an inner surface of the outer plate.   The refrigerator according to any one of claims 1 to 3, wherein an outer packaging material having a vapor deposition layer on the attachment surface side of the vacuum heat insulating material is bonded to a resin surface of an inner plate surface. The base material of the vapor deposition layer on the application surface of the vacuum heat insulating material is a gas barrier resin film,
This gas barrier resin film is polyamide resin film (PA), polypropylene resin film (PP), ethylene vinyl alcohol copolymer resin film (EVOH), polyvinyl alcohol resin film (PVA), polyethylene terephthalate resin film (PET), polyacrylonitrile. The refrigerator according to any one of claims 2 to 5, wherein the refrigerator is any one of resin films (PAN). The base material of the vapor deposition layer on the surface in contact with the urethane foam on the side opposite to the application surface of the vacuum heat insulating material comprises a gas barrier resin film,
This gas barrier resin film is polyamide resin film (PA), polypropylene resin film (PP), ethylene vinyl alcohol copolymer resin film (EVOH), polyvinyl alcohol resin film (PVA), polyethylene terephthalate resin film (PET), polyacrylonitrile. The refrigerator according to any one of claims 2 to 6, wherein the refrigerator is any one or more of resin films (PAN).   The refrigerator according to any one of claims 2 to 7, wherein when the vapor deposition layer is composed of two or more layers, the two layers are laminated on the vapor deposition surfaces. The outer packaging material in contact with the urethane foam, from the outer layer side, the first layer is a layer of polyamide (nylon) resin (PA) or polyethylene terephthalate resin (PET),
The second layer is polyamide resin film (PA), polypropylene resin film (PP), ethylene vinyl alcohol copolymer resin film (EVOH), polyvinyl alcohol resin film (PVA), polyethylene terephthalate resin film (PET), polyacrylonitrile resin A layer consisting of one of the films (PAN),
The third layer is polyamide resin film (PA), polypropylene resin film (PP), ethylene vinyl alcohol copolymer resin film (EVOH), polyvinyl alcohol resin film (PVA), polyethylene terephthalate resin film (PET), polyacrylonitrile resin A layer consisting of one of the films (PAN),
A layer in which the fourth layer, which is the innermost layer, is a high-density polyethylene resin (HDPE) or a heat-weldable resin film,
The refrigerator according to any one of claims 1 to 8, wherein the second layer and the third layer are laminated on surfaces on which aluminum is deposited.   The refrigerator according to any one of claims 1 to 9, wherein molecular sieve 13X is used as an adsorbent. A core material composed of a fiber material laminate, an outer packaging material that covers the core material and is composed of a plurality of layers, and an adsorbent provided inside the outer packaging material,
The outer packaging material is a vacuum heat insulating material in which a plurality of vapor deposition layers by metal vapor deposition are provided on a base made of a resin, and the plurality of vapor deposition layers are stacked so as to face each other and contact each other.

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