JP2009063064A - Vacuum heat insulating material and refrigerator using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum heat insulating material easily manufactured, achieving reduced loss, and formed to match the shapes of various components and a heat insulating portion, and to improve energy saving for a product to which the vacuum heat insulating material is applied. <P>SOLUTION: In this vacuum heat insulating material 1 including a core material 4 formed of material having at least permeability and gas-barrier external covering materials 2, the core material 4 is molded into a solid shape and retained in advance by an inner wrapper 3 having a ventilation part or a binding agent, or the core material 4 formed of foaming material is molded into the solid shape and retained by foaming or the like in a metal mold. In the product to which the vacuum heat insulating material 1 is applied, the solid shape of the vacuum insulating material 1 is formed to match the shape of the product or the shape of the component inside of the product. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vacuum heat insulating material and a refrigerator to which the vacuum heat insulating material is applied.

  In recent years, vacuum heat insulating materials have begun to be applied to household appliances such as refrigerators and commercial electrical products such as commercial freezers in order to further improve the thermal insulation performance, thereby helping to reduce power consumption. The vacuum heat insulating material produced by covering the core material with an outer cover material made of a gas barrier film and sealing the inside under reduced pressure has high heat insulating performance that surpasses conventional polyurethane foam and polystyrene foam, and heat insulation. It is characteristic that the thickness (thickness of the heat insulating material) can be reduced, and is one of the items indispensable for promoting energy saving of the refrigerator.

  Most of the vacuum heat insulating materials are panel-shaped (planar) due to the manufacturing method and the convenience of reliability, and most of them are applied to products such as refrigerators as they are. However, the part to be insulated is not necessarily a planar shape. When there are protrusions or steps in the heat insulating part, it is difficult to apply the panel-shaped (planar) vacuum heat insulating material as it is. Therefore, a method is known in which the shape of the vacuum heat insulating material is made to correspond to the shape of the heat insulating part by processing the vacuum heat insulating material such as bending and drilling, or by shaping the shape of the exterior material in advance. Yes.

  As an example of the vacuum heat insulating material having a three-dimensional shape, there is one disclosed in Japanese Patent Laid-Open No. 4-9582 (Patent Document 1). This is because a hollow shell material molded with a jig is installed in a pressure vessel, the inside of the pressure vessel and the inside of the shell material are evacuated and filled with a heat-insulating filler, and the pressure vessel Air is allowed to flow into the pressure vessel so that the inside has the same pressure as the inside of the outer shell material, and the inside of the outer shell body and the inside of the pressure vessel are re-evacuated to seal the exhaust port of the outer shell body. It aims at obtaining the plate-shaped or box-shaped vacuum heat insulation wall body by this.

  Another example is disclosed in Japanese Patent Application Laid-Open No. 61-168772 (Patent Document 2). This is made by storing a powdery or granular filler in a bag-like shell material, compressing the top and bottom of the shell material using a mold with a convex part, and evacuating the inside of the shell material A vacuum heat insulation panel is characterized in that a recess is formed on the surface thereof.

  Further, there is one disclosed in Japanese Patent Laid-Open No. 63-163764 (Patent Document 3). This is because the inside of the film container filled with heat insulating material is depressurized, and a panel-shaped vacuum heat insulating plate produced by sealing with heat sealing is put into the vacuum container and molded by a mold and held. It is the manufacturing method of the vacuum heat insulating board characterized by returning to a normal pressure in the state which carried out.

Japanese Patent Laid-Open No. 4-9582 JP 61-168772 A Japanese Patent Laid-Open No. 63-163764

  However, in the vacuum heat insulating wall described in Patent Document 1, the pressure is strictly controlled so that the pressure difference between the inside of the pressure vessel and the inside of the outer shell material does not occur in order to prevent the outer shell material from being deformed by the pressure difference. In addition, there are problems that efficient production is difficult due to many manufacturing processes.

  Moreover, in the vacuum heat insulation panel described in Patent Document 2, when producing a vacuum heat insulation panel, a mold must be installed in the vacuum chamber or the mold itself must be a vacuum exhaust device, which is a large-scale device. There was a problem of becoming a product. Further, since the outer shell material is directly applied to the mold, there is a problem that wrinkles are easily generated and the reliability of the vacuum heat insulating panel is lowered.

  In addition, in the vacuum heat insulating plate described in Patent Document 3, since the film container is heat-sealed and sealed, the expansion and contraction of the film container is limited, and depending on the shape, the molded part is returned to normal pressure after molding. There is a possibility that a large stress is locally applied by the atmospheric pressure in the surroundings and the like, and there is a problem that the reliability of the vacuum heat insulating plate is lowered by increasing the stress on the film.

  In view of the above, the present invention provides a vacuum heat insulating material having sufficient reliability according to the shape of various parts and heat insulating parts by a simpler method.

  To achieve the above object, the vacuum heat insulating material of the present invention is a vacuum heat insulating material comprising at least a core material made of a gas permeable material and a jacket material having a gas barrier property. It is characterized in that it is molded and held.

  According to the present invention, it is possible to obtain various three-dimensional vacuum heat insulating materials that match the shapes of various parts and heat insulating portions. By applying the vacuum heat insulating material of the present invention to a product such as a refrigerator, the heat insulating effect of the product is improved, and an energy saving effect by reducing power consumption or the like is obtained.

  Hereinafter, the vacuum heat insulating material of one Example of this invention and the refrigerator which applied this are demonstrated using FIGS. 1-5.

  First, the structure of the vacuum heat insulating material of the present embodiment will be described with reference to FIGS. 1 (a), 2 and 6. FIG. Fig.1 (a) is a schematic diagram of the vacuum heat insulating material which shows one Example of this invention. FIG. 2 shows an example of a method for forming a core material according to an embodiment of the present invention. FIG. 6 is a schematic view of an outer covering material and an inner packaging material showing an embodiment of the present invention.

  An example of a procedure for forming the vacuum heat insulating material having the shape shown in FIG. The vacuum heat insulating material 1 shown in FIG. 1 has a shape including irregularities in the center. First, a flexible fiber-based material such as a glass fiber material or a polyester fiber to be the core material 4 is accommodated in the inner packaging material 3 and, as shown in FIG. The core material 4 is held in a three-dimensional shape by performing compression and molding by a technique such as vacuum forming and sealing the opening and the peripheral edge of the inner packaging material 3 by heat welding, adhesion, or the like. The inner packaging material 3 may not be formed into a bag shape from the beginning. For example, the core material 4 is sandwiched between two plate-shaped inner packaging materials 3 and molded using the molding die 11, and then the opening and the peripheral portion are sealed by heat welding or the like to be held in a three-dimensional shape. Is also possible. Even if the single plate-shaped inner packaging material 3 is formed into a U shape and the core material 4 is sandwiched, the same molding can be performed. Moreover, in order to hold the core material 4 in a three-dimensional shape, a binder (binder) such as boric acid or phenol can be used. When a foam material such as polyurethane, polystyrene, polyethylene, or polypropylene is used for the core material 4, foaming is performed using a mold having a desired shape, or the foam material is formed and then cut or the like to form a three-dimensional structure of the core material 4. Keep shape. Subsequently, the core material 4 held in a three-dimensional shape is accommodated in the bag-shaped outer covering material 2 joined on the three sides by heat welding or the like, and evacuated, and the opening of the outer covering material 2 is sealed by heat welding or the like. By stopping, the shape of the jacket material 2 follows the three-dimensional shape of the core material 4, the core material 4 is tightly encapsulated by the jacket material 2, and the vacuum heat insulating material 1 having a desired three-dimensional shape can be produced.

  The inner packaging material 3 is provided with one or more vent holes so that the pressure can be reduced efficiently during vacuum forming or evacuation.

  When evacuating, the vacuum heat insulating material may be fixed using a jig or the like.

  The three-dimensional shape is not limited to the shape shown in FIG. 1A. For example, the three-dimensional shape is a shape having a partial or overall structure such as bending, bending, concave, convex, etc., and has a substantially Z shape, a substantially U shape, Shapes other than planes, such as a straw hat shape, are mentioned. Further, two or more three-dimensional shapes may be provided for a single vacuum heat insulating material, and a plurality of shapes such as unevenness and bending may be combined.

  Although the three-dimensional shape is not particularly limited, a particularly preferable shape for causing the three-dimensional shape of the core material 4 to follow the shape of the outer cover material 2 and encapsulating it closely is a substantially Z shape as shown in FIG. Alternatively, a plate shape including irregularities as shown in FIG.

  When forming the three-dimensional shape, the thickness of the core material 4 and the inner packaging material 3 in the part to be molded such as bending may be partially increased, and the ease of processing and heat insulation performance, the core of the jacket material 2 may be increased. This can contribute to the improvement of the followability to the material 4.

  After production of the vacuum heat insulating material 1 formed into a three-dimensional shape, if necessary, an excessive portion (ear) of the jacket material 2 that does not include the core material 4 may be bent and fixed (ear fold). At that time, it is not particularly limited to which side of the vacuum heat insulating material 1 the surplus portion of the jacket material 2 is bent.

  As the core material 4, inorganic fibers such as short glass fiber materials, organic fibers such as polyester fibers, resin foams such as polyurethane, polystyrene, polyethylene, and polypropylene, inorganic powders such as silica, or a combination thereof are used. Can be used.

  The surplus portion of the jacket material 2 can be fixed with a tape, a double-sided tape, an adhesive or the like. In addition, it is possible to use a detachable fixing means such as a hook-and-loop fastener or a button represented by Velcro (registered trademark of Kuraray Co., Ltd.), or a rubber band or a PP band. In order not to damage the vacuum heat insulating material 1, one having no protrusion is recommended.

  In the vacuum heat insulating material of the present invention, the core material 4 is compressed and held in a three-dimensional shape by the inner packaging material 3, so that the outer shell material 2 follows the core material shape during vacuum evacuation and is sealed when the outer shell material 2 is sealed. Since the vacuum heat insulating material 1 encapsulated in a state in which the material 2 is in close contact with the core material 4 and formed into a three-dimensional shape can be obtained, compared with the case where the plate-shaped vacuum heat insulating material is processed into a desired shape later. Since the generation of local wrinkles and serious damage to the film in the jacket material 2 can be suppressed and the gas barrier property is prevented from being lowered, the heat insulating performance of the vacuum heat insulating material 1 having a three-dimensional shape is improved.

  In addition, as shown in FIG. 6A, the flat vacuum heat insulating material is such that the jacket material 2 and the inner packaging material 3 are in close contact with each other, and the ridges formed on the outer jacket material 2 can be filled with the inner packaging material 3. it can. Also in the vacuum heat insulating material 1 of the present invention, when the outer cover material 2 follows the shape of the core material 4 and encloses it tightly, a part of the outer cover material 2 is attracted to the concavo-convex portion 6 and the step bending portion 7. However, as shown in FIG. 6B, the inner packaging material 3 is in close contact with the outer jacket material 2 including the ear portion of the outer jacket material 2 as shown in FIG. By filling the wrinkles formed in the jacket material 2, film damage to the jacket material 2 that can cause vacuum breakage can be suppressed, and high heat insulation can be obtained. In addition, as shown in FIG. 6C, the ear part of the inner packaging material 3 is located at the ear part of the outer cover material 2, so that the ear member 2 is in direct contact with the case where the outer cover materials 2 are in direct contact with each other. Heat conduction in the part can be suppressed (suppression of heat bridge). By forming such a vacuum heat insulating material 1, vacuum heat insulating materials having various shapes and high heat insulating performance can be easily obtained.

  Even if the vacuum insulation material 1 is broken by vacuum because the outer cover material 2 is damaged, the core material 4 is held in a three-dimensional shape even under normal pressure by the inner packaging material 3. Since the vacuum heat insulating material 1 can be produced by evacuating as it is, defective products can be reduced and productivity is excellent.

  By applying the molding method as described above, it is possible to provide the vacuum heat insulating material 1 having excellent heat insulating properties without impairing productivity.

  Moreover, as shown in FIG.4 and FIG.5, when applying the vacuum heat insulating material 1 of this invention to the refrigerator which consists of an outer box and an inner box, the three-dimensional shape is the shape of an inner box or an outer box, and the components inside a refrigerator. By conforming to the shape, the area to be insulated (coverage ratio) can be increased, and it is possible to efficiently insulate with the vacuum heat insulating material 1 having high heat insulation performance. In particular, the vacuum heat insulating material 1 according to the present invention directly insulates the refrigerator interior lighting, electrical parts, heat generating parts such as compressors, etc., thereby suppressing the heat leakage of the refrigerator, resulting in energy saving. To contribute.

  In the vacuum heat insulating material 1 according to the present invention, since the core material 4 is held in a three-dimensional shape in advance in the manufacturing method, it is not necessary to provide a groove in a portion to be bent or the like, and the heat insulating performance by reducing the plate thickness by the groove or breaking the fiber. Therefore, it has high heat insulation performance. Further, when the core material 4 is fixed in a three-dimensional shape by the inner packaging material 3, it is not necessary to use a binder such as phenol or boric acid, and the disadvantages of using the binder can be overcome. As a disadvantage of the binder, for example, in the case of phenol, there is a deterioration in the thermal conductivity of the vacuum heat insulating material 1 due to volatilization under vacuum. In addition, in the case of inorganic binders such as boric acid, the binder concentration must be increased in order to maintain the three-dimensional shape. In addition to the deterioration of the thermal conductivity due to the increase in the solid thermal conductivity that travels through the binder solid, the binder is solidified. There is a possibility that the produced crystal component may damage and damage the outer cover material 2.

  Next, the vacuum heat insulating material 1 of a present Example is demonstrated, referring FIG.1 (b). FIG.1 (b) is sectional drawing of the vacuum heat insulating material 1 which shows one Example of this invention. In addition, the following description is one Example in this invention, This invention is not limited to this.

  The vacuum heat insulating material 1 includes an inner packaging material 3, a core material 4, an adsorbent 5, an inner packaging material 3, a core material 4, and an adsorbent 5 and a jacket material 2 made of a gas barrier film. Has been. The vacuum heat insulating material 1 is formed by decompressing the inside of the outer covering material 2 in a state where the core material 4 and the adsorbent 5 wrapped in the inner covering material 3 are inserted into the outer covering material 2, and It is produced by heat-sealing and sealing. The shape of the vacuum heat insulating material 1 is not specifically limited, The thing of various shapes and thickness is applicable according to the location and workability | operativity applied.

  The core material 4 is a fiber material such as a short glass fiber material or a laminate of organic fibers, cut into an appropriate size and shape, accommodated in the encapsulating material 3 together with the adsorbent 5, and encapsulated while being compressed. The peripheral part of the material 3 is thermally welded and sealed. By this processing, the core material 4 can be smoothly inserted into the jacket material 2, and workability is improved.

  For the purpose of dehydration and degassing of the core material 4, it is effective to age the core material 4 before insertion into the jacket material 2. The heating temperature at this time is preferably at least 110 ° C. because it is possible to remove the moisture adhering to the surface at least, and in the case of a short glass fiber material, in order to reduce the moisture content of the core material as much as possible. It is more preferable to age at 180 ° C. or higher.

  As a short glass fiber material, it is preferable that an average fiber diameter is 3-5 micrometers. The short glass fiber material greatly affects the thermal conductivity characteristics and cost depending on the average fiber diameter. Glass wool with an average fiber diameter of more than 5 μm, which is low in cost, has a large thermal conductivity and deterioration over time because the contact heat of the fibers is close to the line because the fibers are arranged in the same direction, Inferior. On the other hand, when the average fiber diameter is less than 2 μm, the contact thermal resistance is increased by decreasing the contact of the fibers, but the thickness per sheet is thin and the heat insulation performance is inferior. By earning, heat conductivity and deterioration over time must be reduced, resulting in inferior productivity and cost.

  As described above, since the thermal conductivity increases when the fiber diameter exceeds 5 μm, a fiber material that is discontinuous in the heat transfer direction and that effectively utilizes the contact resistance between the materials is selected. In addition to the contact thermal resistance, the heat flow path becomes zigzag, and a short glass fiber material having an average fiber diameter of 3 to 5 μm is selected from many fiber materials whose thermal resistance increases and thermal conductivity decreases. Therefore, it is possible to achieve both reduction in thermal conductivity and deterioration with time, reduction in thickness reduction rate, and cost reduction.

  About the fiber direction of a short glass fiber material and an organic fiber, what is arranged along with a horizontal direction with respect to the thickness direction of a vacuum heat insulating material is preferable at the point of heat insulation performance.

  The organic fiber laminate is not particularly limited as long as it can achieve both heat insulation and processability, such as polyethylene fiber, polypropylene fiber, polyamide fiber, polyethylene terephthalate fiber, and polyester fiber.

  The inner packaging material 3 may be a bag-like or container-like material that can be bonded by heat welding, an adhesive, or the like, can be molded, and does not generate outgas. The material is not particularly limited. For example, polyethylene resin (high density, medium density, low density) excellent in sealing properties and chemical attack resistance, polypropylene resin, polystyrene resin, ABS resin (acrylonitrile / (Butadiene / styrene resin), polyethylene terephthalate resin, polybutylene terephthalate resin, polyamide resin and other thermoplastic resins, phenolic resin, epoxy resin, urea resin, polyurethane and other thermosetting resins, and methacrylic copolymers. Resin. The resin used may be unstretched or stretched. In addition, a filler or the like may be mixed in the resin to improve the strength. Here, an example is given centering on resin, but it is not necessary to limit to resin, and the inner packaging material 3 may be an inorganic substance. The thickness of the inner packaging material 3 is not particularly limited as long as the three-dimensional shape of the core material 4 can be maintained at the time of molding (the appropriate thickness varies depending on the material of the inner packaging material 3).

  After the core material 4 is inserted into the inner packaging material 3, the core material 4 is set on the molding die 11 and subjected to pressure molding. You may combine heat forming, vacuum forming, etc. as needed. Next, while pressurizing the core material 4, all the excess portions of the inner packaging material 3 not including the core material 4 are thermally welded to fix the shape. However, if the core material 4 is fixed, the inner packaging material 3 does not need to be thermally welded. For example, if the core material 4 can be fixed by heat-welding up to 10 mm from the end of the core material 4 among the surplus portions of the inner packaging material 3, the remaining surplus portions may not be heat-welded. Moreover, when using the thermosetting resin etc. which have the property hardened | cured by heating for the inner packaging material 3, it becomes possible to hold | maintain the three-dimensional shape of the core material 4 by heat-compressing the whole. Moreover, when using the photocurable resin etc. which have the property hardened | cured by light irradiations, such as an ultraviolet-ray, for the inner packaging material 3, the shape of the core material 4 is fixed by irradiating light while pressing the core material 4, and fixing the shape. A three-dimensional shape can be maintained.

  In order to depressurize the inside of the core material 4 when evacuating, one or more vent holes must be provided, but the size, shape, number, and location of the vent holes are not particularly limited. For example, (1) five circular vents with a diameter of 3 mm are provided at the end of the core member 4, (2) one slit-like vent is provided at the end of the core member 4, etc. There is no particular limitation as long as there is no problem with shape retention and evacuation.

  The outer covering material 2 is a polyamide film (15 μm) as a surface protective layer for improving scratch resistance from the outer layer, a polyethylene terephthalate film (12 μm) on which aluminum is vapor-deposited, and an ethylene-vinyl alcohol copolymer on which aluminum is vapor-deposited as a gas barrier layer. A resin film (12 μm) and a laminate film using a high-density polyethylene film (50 μm) as a heat welding layer are used. At this time, if the aluminum deposition surfaces of the surface protective layer and the gas barrier layer are bonded together, the gas barrier property becomes higher. Moreover, as an adhesive for adhering each layer, a two-component curable ester-type urethane adhesive is used, but is not particularly limited thereto. For example, a two-component curable ether type urethane adhesive, an acrylic adhesive, a polyester adhesive, an epoxy adhesive, a silicon adhesive, or the like may be used instead. And this jacket material 2 is used as a bag which bonded the heat welding layers together.

  In the jacket material 2, the surface protective layer is for dealing with impact resistance, the gas barrier layer is for securing gas barrier properties, and the heat welding layer is formed inside the vacuum heat insulating material 1 by heat welding. It is for sealing. Therefore, all known materials can be used as long as they meet these purposes. Further, as a means for further improvement, for example, by depositing metal or silica on the surface protective layer, gas barrier properties are added in addition to impact resistance, or two or more films having metal or silica deposited on the gas barrier layer. It may be provided or a metal foil may be used. As the heat welding layer, polypropylene resin, polyacrylonitrile resin, or the like may be used.

  The jacket material 2 will be described more specifically. The jacket material covers the core material in order to provide an airtight portion inside, and is not particularly limited as a constituent material. For example, a polyamide resin for the surface protective layer, a polyethylene terephthalate resin with aluminum vapor deposition, an aluminum foil for the gas barrier layer, a plastic laminate film made of high-density polyethylene resin for the heat welding layer, a polyamide resin for the surface protective layer, and a polyethylene with aluminum vapor deposition A bag of terephthalate resin, ethylene-vinyl alcohol copolymer resin (trade name EVAL, manufactured by Kuraray Co., Ltd.) with aluminum vapor deposition on the gas barrier layer, and a plastic laminate film made of high-density polyethylene resin on the heat-welded layer Etc. are exemplified.

  As a means for further improvement, two layers of ethylene-vinyl alcohol copolymer resin having an aluminum vapor deposition layer on the gas barrier layer may be provided by vapor deposition of aluminum on a polyamide resin as a surface protective layer. As the heat-welded layer, a high-density polyethylene resin is preferable from the viewpoint of sealing properties and chemical attack resistance, but other than this, a low-density polyethylene resin, a polypropylene resin, a polyacrylonitrile resin, or the like may be used. Specific examples of the material of the jacket material include, for example, a polyamide resin in the first layer from the outer layer, a polyethylene terephthalate resin having aluminum vapor deposition in the second layer, an aluminum foil in the third layer, and a fourth layer. It is an aluminum laminate film made of high-density polyethylene resin.

  For the purpose of degassing the remaining organic solvent or the like of the jacket material 2, it is effective to age the jacket material 2 before inserting the core material 4. The condition at this time is that various organic solvents can be removed, and therefore, it is desirable to perform vacuum drying for 1 hour or more after heating at 70 ° C. or more and 3 hours or more.

  The adsorbent 5 is a molecular sieve that is a synthetic zeolite mainly composed of a hydrous metal salt of alumino-silicate. In other words, by using a molecular sieve as the adsorbent 5 to be enclosed in the jacket material 2, water vapor released from the core material 4 and gas entering from the outside through the jacket material 2 are adsorbed, and the vacuum heat insulating material 1 is timed. Deterioration can be kept low. Preferably, it is used in a state where it absorbs little moisture immediately after being taken out from a sealed container such as a drum can. Further, the shape of the molecular sieve is not particularly limited, such as pellets, beads, and powders.

  In this example, molecular sieve is used as the adsorbent component, but in order to improve the reliability of the vacuum heat insulating material, a gas such as quick lime, dosonite, hydrosartite, or metal oxide is used as necessary. It is also effective to substitute or use a known adsorbent, such as an adsorbent, an alloy such as a barium-lithium alloy, or a hydrophobic molecular sieve with an enhanced adsorption capability of a volatile or hydrophobic organic gas. These adsorbents may be covered with a known packaging material.

  Further, the adsorbent 5 is inserted into the fiber layer of the core material 4 when the vacuum heat insulating material 1 is manufactured. With this insertion, after the vacuum heat insulating material 1 is manufactured, the adsorbent 5 does not protrude from the surface of the outer cover material 2, so that the outer cover material 2 is not damaged or broken by the particles of the adsorbent 5. The reliability of the heat insulating material 1 with respect to the heat insulating performance is not impaired. At this time, the adsorbent 5 is not inserted into the recess for housing the heat-generating component. For example, as shown in FIG. 1B, the core material 4 fiber layer in the vicinity of the final sealing portion where no recess is formed in the vacuum heat insulating material 1 Insert inside. By doing so, since the adsorbent 5 is not heated by the heat-generating component, the adsorption performance of water vapor and gas in the adsorbent 5 can be efficiently exhibited, and the heat insulation performance in the vacuum heat insulating material 1 is improved. Furthermore, when the vacuum heat insulating material 1 is three-dimensionally molded, the adsorbent 5 can prevent the vacuum heat insulating material 1 from being damaged by damaging the outer cover material 2, and the reliability can be improved.

  As described above, the gas adsorbing performance of the adsorbent 5 can be further maintained without deteriorating the handleability and workability at the time of production in the vacuum heat insulating material 1, and as a result, the heat insulating performance is excellent over a long period of time. A vacuum insulation can be provided.

  Next, an embodiment of the present invention will be described with reference to FIGS. FIG.1 and FIG.3 is the schematic diagram and sectional drawing of a vacuum heat insulating material which show one Example of this invention. FIG. 2 shows an example of a method for forming a core material according to an embodiment of the present invention.

Example 1
The vacuum heat insulating material 1 includes an inner packaging material 3, a core material 4, an adsorbent 5, an inner packaging material 3, a core material 4, and an outer shell material 2 that contains the adsorbent 5 and is made of a gas barrier film. ing. The vacuum heat insulating material 1 is formed by decompressing the inside of the outer covering material 2 in a state where the core material 4 and the adsorbent 5 wrapped in the inner covering material 3 are inserted into the outer covering material 2, and It is produced by heat-sealing and sealing.

  The inner packaging material 3 is an ABS resin (thickness 1 mm), the core material 4 is a short glass fiber material (average fiber diameter 4 μm), the adsorbent 5 is synthetic zeolite, the outer jacket material 2 is a surface protective layer, a gas barrier layer, and A laminate film composed of a heat-welded layer and having each layer bonded with a two-component curable ester urethane adhesive is used. Further, the core material 4 has a width of 450 mm and a length of 500 mm so that the thickness after evacuation is 12 mm. The size of the jacket material 2 was 560 mm in width and 650 mm in length.

  The laminate structure of the jacket material 2 is a polyamide film (15 μm) as a surface protective layer from the outer layer, a polyethylene terephthalate film (12 μm) having aluminum vapor deposition, and an ethylene-vinyl alcohol copolymer resin film (12 μm) having aluminum vapor deposition as a gas barrier layer. ), And a high-density polyethylene film (50 μm) as a heat-welded layer.

  A procedure for producing the vacuum heat insulating material 1 configured as described above will be described below. First, the core material 4 is accommodated in the inner packaging material 3, and compression and molding are performed by pressing from above and below using a molding die 11, and in this state, the opening and the entire peripheral edge of the inner packaging material 3 are thermally welded and sealed. By stopping, the core material 4 was held in a three-dimensional shape. The inner packaging material 3 was provided with holes serving as a plurality of vent holes on each side surface. Subsequently, the core material 4 held in a three-dimensional shape is stored in the bag-like outer covering material 2 welded by heat welding on three sides, and this is evacuated in a vacuum chamber to reduce the pressure inside the outer covering material 2. After that, the vacuum insulating material 1 having a three-dimensional shape having the concavo-convex portion 6 shown in FIG. 1 was obtained by sealing the opening of the jacket material 2 by heat welding.

  The heat conductivity of the vacuum heat insulating material 1 obtained in this way was 2.2 mW / m · K. As a result of measuring the thermal conductivity after leaving it in a high-temperature bath at 70 ° C. for 45 days, it was 4.8 mW / m · K, and the difference from the initial performance was 2.6 mW / m · K.

(Example 2)
A three-dimensional core material 4 having a step-bent portion 7 as shown in FIG. This is housed in a bag-shaped outer cover material 2 which is welded on three sides by heat welding, the inside of the outer cover material 2 is depressurized by evacuation in a vacuum chamber, and then the opening of the outer cover material 2 is heat-welded. The vacuum heat insulating material 1 having the three-dimensional shape shown in FIG.

  The heat conductivity of the vacuum heat insulating material 1 obtained in this way was 1.7 mW / m · K. As a result of measuring the thermal conductivity after leaving it in a high temperature bath at 70 ° C. for 45 days, it was 4.4 mW / m · K, and the difference from the initial performance was 2.7 mW / m · K.

(Comparative Example 1)
A panel-shaped vacuum heat insulating material 1 having the same material configuration and size as in Example 1 and not three-dimensionally formed was produced.

  The thermal conductivity of the vacuum heat insulating material 1 was 1.9 mW / m · K. As a result of measuring the thermal conductivity after leaving it in a high-temperature bath at 70 ° C. for 45 days, it was 4.5 mW / m · K, and the difference from the initial performance was 2.6 mW / m · K.

  From the results of Examples 1 and 2 and Comparative Example 1, there is no clear difference in thermal conductivity between the Example and Comparative Example in the present invention, and it is considered that the film damage due to molding is small in the production method according to the present invention, and the thermal conductivity. It can be said that there is almost no difference in the deterioration of.

  The embodiment of the present invention is an example of the vacuum heat insulating material according to the present invention, and a vacuum heat insulating material other than the above shape can be manufactured by holding the core material 4 in a corresponding shape by the inner packaging material 3.

  As described above, according to the present invention, the vacuum heat insulating material 1 can be formed into a three-dimensional shape without impairing productivity, and the three-dimensional shape of the vacuum heat insulating material 1 is adapted to the shape of the part to be insulated. By doing so, since it becomes possible to increase the heat insulation area (coverage rate) by the vacuum heat insulating material 1, the high heat insulation effect can be acquired. Therefore, when the vacuum heat insulating material according to the present invention is applied to a product that requires heat insulation such as a refrigerator, the energy saving effect can be further enhanced.

It is the (a) schematic diagram and (b) sectional drawing of the vacuum heat insulating material which show one Example of this invention. It is an example of the shaping | molding method of the core material which shows one Example of this invention. It is the (a) schematic diagram and (b) sectional drawing of the vacuum heat insulating material which show one Example of this invention. It is a schematic diagram of the refrigerator with which the vacuum heat insulating material which shows one Example of this invention was applied. It is a schematic diagram of the refrigerator with which the vacuum heat insulating material which shows one Example of this invention was applied. It is the schematic diagram which showed only the jacket material and inner packaging material which show one Example of this invention. (A) No molding, (b) Molding

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vacuum heat insulating material 2 Jacket | cover material 3 which consists of a film made from a gas barrier 3 Inner packaging material 4 Core material 4a Core material notch part 5 Adsorbent 6 Uneven part 7 in a vacuum heat insulating material 7 Step bending part 11 in a vacuum heat insulating material Mold 21 Refrigerator 22 Outer box 23 Inner box 24 Refrigerator door 25 Refrigerator parts (interior lighting, etc.)

Claims (6)

  A vacuum heat insulating material comprising at least a core material made of a material having air permeability and a jacket material having a gas barrier property, wherein the core material is preliminarily molded and held in a three-dimensional shape.   The vacuum heat insulating material according to claim 1, wherein the core material is made of a flexible fiber-based material, and the core material is held in a three-dimensional shape by an inclusion material having a ventilation portion.   The vacuum heat insulating material according to claim 1, wherein the core material is made of a flexible fiber-based material, and the core material is held in a three-dimensional shape by a binder.   2. The vacuum heat insulating material according to claim 1, wherein the core material is made of a foam material having open cells, and the core material is held in a three-dimensional shape by a mold, a cutting process, or the like.   A vacuum heat insulating material comprising at least a core material made of a fiber-based material having flexibility, an inner material containing the core material and having a ventilation portion, and an outer jacket material having a gas barrier property. A vacuum heat insulating material, wherein the material is held in a three-dimensional shape and sealed after being decompressed in the outer covering material, whereby the outer covering material is closely attached to the core shape.   In the refrigerator to which the vacuum heat insulating material is applied, the three-dimensional shape is adjusted to at least a part in the space between the outer box and the inner box constituting the refrigerator, a protruding part of the inner box or the outer box, an uneven part, etc. A refrigerator characterized by its shape.

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