JP2006118636A - Vacuum heat insulating material and refrigerator using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum heat insulating material for maintaining heat insulating performance for a long period without the formation of a pin hole due to the mutual interaction of hardness, size and weight even under such severe conditions that an inorganic fiber board core material is applied to the vacuum heat insulating material for a refrigerator. <P>SOLUTION: The core material 3 is put in a plastic bag 4 holed for evacuation, its outside is covered with a covering 2, and the covering 2 is depressurized and sealed. Thus, the formation of the pin hole is prevented which is caused when the fiber distal end of the core material 3 sticks into the inside of the covering 2. <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 recent years, energy conservation in home appliances has become an important issue to be addressed urgently, while the protection of the global environment has been greatly screamed. One solution is to apply a vacuum heat insulating material for the purpose of preventing unnecessary heat transfer.

  The vacuum heat insulating material is a heat insulating material in which the foamed resin, fiber material or the like is put in the outer cover material as a core material, and the heat conductivity of the gas is remarkably lowered by keeping the heat insulating material inside a vacuum. In order to maintain the heat insulation performance for a long time, it is necessary to keep the inside of the heat insulating material in a vacuum. However, when pinholes are generated in the jacket material, there is a problem that the heat insulation performance is greatly deteriorated due to gas intrusion from the outside.

  Therefore, in the laminate construction of the vacuum insulation jacket material, a technology that enhances external wear resistance, scratch resistance, etc. by additionally laminating a highly scratch resistant nylon film on the outermost layer of the jacket material Is disclosed (for example, see Patent Document 1).

  Moreover, as a packaging material other than a vacuum heat insulating material, a packaging bag for electronic parts intended to increase strength and moisture resistance, and a technique for improving puncture resistance using nylon has been disclosed (for example, (See Patent Document 2, Patent Document 3, and Patent Document 4).

  This conventional laminated film is used for electronic parts packaging bags (including electronic parts storage container packaging bags) for protecting electronic parts such as semiconductor devices from moisture and static electricity. The purpose is to protect the parts from the time they are manufactured until they are mounted, and the durability of the moisture-proof effect for about 1 to 2 years is taken into consideration.

Further, nylon films co-pressed with a heat-welded film are also used for an exterior film of a tray-filled product that requires puncture strength, and bonded to a plastic film that serves as a gas barrier layer (see, for example, Patent Document 5). ).
Japanese Patent Laid-Open No. 61-27392 JP-A-9-193305 JP-A-9-193306 JP-A-9-193307 JP 2000-52515 A

  In other words, the main purpose of the contents of ordinary packaging materials is to protect them, and the storage period is several years at most. On the other hand, in the jacket material of the vacuum heat insulating material, the degree of vacuum inside the vacuum heat insulating material is directly related to the heat insulating performance. In particular, considering that the vacuum insulation material mounted on the refrigerator will be used for more than 10 years, slight pinholes are not allowed, and the improvement of the puncture resistance of the jacket material maintains the insulation performance of the vacuum insulation material. It is very important in thinking about

  Even in the conventional jacket material specification, when a core material having a low hardness and density, such as foamed resin, is used as the core material of the vacuum heat insulating material, no pinhole is generated. However, for a wide range of applications such as refrigerators, a relatively large vacuum heat insulating material is required. Furthermore, when inorganic fibers are molded into a board shape, the hardness increases and the force applied during molding In this case, the fiber on the surface of the board is broken, and the sharpened fiber is slightly present on the surface of the board.

  When this is used for the core material of the vacuum heat insulating material, there is a possibility that the tip of the fiber may pierce the jacket material from the inside. In addition, in order to reduce pinholes caused by such piercing from the inside, if a further layer is added between the heat-welding layer and the barrier layer of the outer cover material which is a laminate structure, gas intrusion from the seal portion increases. There is a possibility that the heat insulation performance of the vacuum heat insulating material over time will be lowered.

  In the present invention, by providing a protective material between the core material and the jacket material, the hardness, size, and weight of each other can be obtained even under severe conditions such as applying the inorganic fiber board-shaped core material to a vacuum heat insulating material for a refrigerator. It is an object of the present invention to provide a vacuum heat insulating material that does not cause pinholes due to action and maintains heat insulating performance for a long period of time, and to provide an energy saving refrigerator that uses this vacuum heat insulating material.

  In order to solve the above conventional problems, the vacuum heat insulating material of the present invention is a polyhedral molded body in which the core material is formed by adding a binder to inorganic fibers, and the binder concentration of the surface layer of the board-shaped molded body is the other layer. The core material, which is larger than the polyhedron, is put in a plastic film bag provided with at least one mouth, and the outer side is covered with a jacket material having a laminate structure, and the inside is decompressed.

  This reduces the possibility of the core fiber tip directly coming into contact with the jacket material, so that the generation of pinholes that occur when the fiber tip on the core material plane pierces the jacket material from the inside during vacuum insulation material production decompression. The possibility can be reduced. In addition, since at least one opening of the bag containing the core material is opened, the air inside the bag containing the core material can be easily decompressed when the vacuum heat insulating material is produced and decompressed.

  ADVANTAGE OF THE INVENTION According to this invention, the possibility of the pinhole generation | occurrence | production which arises when the fiber front-end | tip of a core material plane stabs a jacket material from the inner side at the time of vacuum heat insulating material production pressure reduction can be reduced. Moreover, the air inside the bag containing the core material can be easily depressurized when the vacuum heat insulating material is produced and depressurized.

  The invention described in claim 1 of the present invention is a polyhedron molded body in which the core material is formed by adding a binder to inorganic fibers, and the core material having a binder concentration in the surface layer of the board-shaped molded body is larger than that of the other layers. The vacuum heat insulating material is characterized in that the core material which is a polyhedron is placed in a plastic film bag having at least one opening, and the outer side is covered with a covering material having a laminate structure, and the inside is decompressed. .

  In order to reduce the possibility of the core material fiber tip coming into direct contact with the jacket material, a pinhole is generated when the fiber tip on the core material plane pierces the jacket material from the inside during vacuum insulation material production decompression. The likelihood of occurrence can be reduced. In addition, since at least one opening of the bag containing the core material is opened, the air inside the bag containing the core material can be easily decompressed when the vacuum heat insulating material is produced and decompressed.

  The invention according to claim 2 is the vacuum heat insulating material according to claim 1, wherein a hole is provided in a side surface of the bag of the plastic film containing the core material.

  Thereby, since the air inside the bag can be depressurized also from the bag side of the plastic film containing the core material, the depressurization time at the time of producing the vacuum heat insulating material is smaller than in the case of the invention according to claim 1. It can be further reduced. Further, since the upper and lower surfaces of the bag containing the core material are not perforated in the same manner as in the case of the first aspect of the invention, the vacuum heat insulating material is produced in the same manner as in the case of the first aspect of the invention. During decompression, the possibility of pinholes occurring when the fiber tip on the core material plane pierces the jacket material from the inside can be reduced.

  The invention according to claim 3 is the vacuum heat insulating material according to claim 1 or 2, wherein a large number of small holes are provided on the entire surface of the bag of the plastic film.

  Thereby, since a small hole is provided on the entire surface of the bag containing the core material, the decompression time at the time of manufacturing the vacuum heat insulating material should be further reduced as compared with the case of the invention according to claim 1 or 2. Can do. Further, since only the small holes are opened on the upper and lower surfaces of the bag containing the core material, the fiber tip on the core material plane is reduced during the vacuum insulation material production decompression as in the case of the invention of claim 1 or 2. The possibility of pinholes occurring when the jacket material is pierced from the inside can be reduced.

  Invention of Claim 4 is the vacuum heat insulating material as described in any one of Claim 1 to 3 with which all the mouths of the bag of the said plastic film are closed by heat welding.

  As a result, the core material can be smoothly inserted into the jacket material when the core material at the time of vacuum insulation material production is inserted into the jacket material, so that the workability at the time of vacuum insulation material production can be improved. it can.

  The invention according to claim 5 is the vacuum heat insulating material according to any one of claims 1 to 4, characterized in that the core material is put in a double bag of the plastic film.

  This can increase the puncture resistance when the fiber tip on the core material plane pierces the jacket material from the inside during the vacuum decompression of the vacuum heat insulating material, and at the same time, one inner sheet of the plastic film that is doubled. Even if there is a hole in the bag, it is possible to prevent the core fiber from coming into contact with the jacket material by the single outer bag. The possibility of pinholes occurring when the fiber tip of the fiber pierces the jacket material from the inside can be reduced.

The invention according to claim 6 is the vacuum heat insulating material according to any one of claims 1 to 5, wherein the plastic film is polyethylene.
Invention of Claim 6 of this invention is a vacuum heat insulating material as described in any one of Claim 1 to 5 whose said plastic film is polyethylene.

  Thereby, since polyethylene, which is an inexpensive plastic film, is used, the fiber tip on the core material plane is reduced at a lower cost than in the case of the inventions of claims 1 to 5 and during vacuum insulation material production decompression. The possibility of pinholes occurring when the jacket material is pierced from the inside can be reduced.

  The invention according to claim 7 is a laminate film in which the covering material has at least a heat-fusible layer, an outer gas barrier layer, and an outer protective layer, and the protective layer is a single layer. It is a vacuum heat insulating material as described in any one of Claim 1 to 6 characterized by the above-mentioned.

  As a result, since the core material is contained in a plastic bag, the tip fiber of the core material plane is pierced resistance when the fiber tip of the core material plane pierces the jacket material from the inside during vacuum insulation material production decompression. In addition, since the protective layer, which is usually a two-layered structure of a laminate-structured jacket material, can be formed into a single-layer structure, the vacuum heat insulation according to any one of claims 1 to 6 The possibility of pinholes occurring when the fiber tip on the core material plane pierces the jacket material from the inside at the time of decompressing the vacuum heat insulating material can be reduced at a lower cost than the material.

  The invention according to claim 8 is the vacuum heat insulating material according to any one of claims 1 to 7, wherein the protective layer is polyethylene terephthalate.

  As a result, polyethylene terephthalate, which is highly resistant to friction and abrasion, is used for the protective layer, so that it is even more resistant to friction and abrasion from the outside of the vacuum heat insulating material than in the case of claims 1 to 7. Can be improved.

  The invention according to claim 9 is the vacuum heat insulating material according to any one of claims 1 to 8, which is press-molded with a mold having a convex portion and grooved.

  As a result, these vacuum heat insulating materials can more reliably prevent the generation of pinholes that occur when the core fiber tip pierces the jacket material from the inside, so that deeper grooves are produced by press molding. can do. Therefore, even when there is a pipe having a larger diameter in the planar shape of the heat-insulated part, it is possible to insulate by covering the pipe with a groove formed deeper of the vacuum heat insulating material.

  The invention according to claim 10 is attached to the outer box, the inner box, the foam heat insulating material filled in the space formed by the outer box and the inner box, and the inner wall of the outer box or the inner box. It is a refrigerator characterized by comprising the heat insulation box provided with the vacuum heat insulating material as described in any one of Claim 1 to 9.

  As a result, when applying a vacuum heat insulating material that uses a board-shaped core material, which is usually formed of inorganic fibers, to a refrigerator, the size and weight of each sheet increases, so that the core fiber tip is attached to the outer cover material from the inside. Provided a refrigerator that can save energy for a long time because it can be equipped with a vacuum insulation material that maintains heat insulation performance for a long time without generating pinholes, where the risk of pinhole occurrence that occurs when piercing is extremely high can do.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a vacuum heat insulating material according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view of an essential part showing the jacket material of FIG.

  As shown in FIG. 1, the vacuum heat insulating material 1 includes a jacket material 2, a core material 3 covered with the jacket material 2, and a plastic film in which at least one opening is opened and the core material 3 is directly placed. Bag 4.

  As shown in FIG. 2, the jacket material 2 is a laminate film having a first protective layer 5, a second protective layer 6, a gas barrier layer 7, and a heat welding layer 8 in order from the outside. The film is made in a three-sided seal, the first protective layer 5 is a nylon film, the second protective layer 6 is a polyethylene terephthalate film, the gas barrier layer 7 is an aluminum foil, and the heat welding layer 8 is a linear low density. A polyethylene film is used, and the thickness is 15 μm for the first protective layer 5 (nylon film), 12 μm for the second protective layer 6 (polyethylene terephthalate film), 6 μm for the gas barrier layer 7 (aluminum foil), and heat. The welding layer 8 (linear low density polyethylene film) is 50 μm.

  In order to evaluate the piercing from the inside, the core material 3 was a glass wool board having a particularly high surface hardness and dried in a drying furnace at 140 ° C. for 1 hour.

The core material 3 was put in a plastic film 4 and then inserted into the envelope material 2 formed in a bag, the inside was depressurized to 10 Pa, and the opening was sealed by heat welding. The density of the vacuum heat insulating material was 150 kg / m ³ .

  In the vacuum heat insulating material 1 obtained as described above, since the core material 3 is put in the plastic film 4 and the outer side thereof is covered with the jacket material 2, the core material 3 has a fiber tip directly on the jacket material 2. There is little possibility of contact, and the possibility of pinholes occurring when the fiber tip in the plane of the core material 3 pierces the outer cover material 2 from the inside during the decompression of the vacuum heat insulating material 1 can be reduced.

  Therefore, even if 1000 sheets and the vacuum heat insulating material 1 were produced, no pinhole was generated, and the heat conductivity was maintained at 0.0025 (W / mK) for all 1000 sheets. On the other hand, when 1000 sheets of vacuum heat insulating material were produced by directly covering with the jacket material 2 without putting them in the plastic film bag 4, the occurrence of two pinholes was confirmed, and the thermal conductivity was 0.0025 (W / There was a vacuum heat insulating material that deteriorated from mK) to 0.0100 (W / mK) or more.

  In addition, as an inorganic fiber used for the core material 3, glass wool, glass fiber, an alumina fiber, a silica alumina fiber, a silica fiber, rock wool, a silicon carbide fiber, etc. are not specified in particular.

  In addition, a binder may be used to improve handling when the board is heated and pressed. If a binder is used, the risk of pinholes increases due to the increased hardness of the core material 3 made into a board. However, if the core material 3 is placed in a plastic film bag 4 as in the present embodiment. Even when the core material 3 has a high hardness due to the binder, the occurrence of pinholes can be prevented.

  As the protective layers 5 and 6 of the jacket material 2 having a laminate structure, nylon films having various mechanical properties such as impact resistance, flex resistance and tensile strength are used, and the type is nylon-6. Nylon-6.6, MXD nylon, etc. are not particularly specified, but the use of aromatic nylon can further improve gas barrier properties.

  In addition, examples of the form of the nylon film include a single-layer nylon film and a multilayer nylon film obtained by co-extrusion of different types of nylon, but are not particularly specified.

  In addition to the nylon film, a polyethylene terephthalate film, a stretched product of a polypropylene film, and the like can be used. When the polyethylene terephthalate film is used, the water vapor barrier property can be improved.

  A metal foil is most suitable as the gas barrier layer 7 of the jacket material 2 having a laminate structure. However, a metal film, a metal oxide, or a plastic film on which diamond-like carbon is vapor-deposited can be used to reduce gas permeation. If it is used for the purpose, it is not particularly specified.

  As the metal foil, aluminum, stainless steel, iron or the like can be used, but is not particularly specified.

  Aluminum, cobalt, nickel, zinc, copper, silver, or a mixture thereof can be used as a material for metal vapor deposition on the plastic film, but it is not particularly specified.

  Further, silica, alumina or the like can be used as a material for metal oxide vapor deposition on the plastic film, but it is not particularly specified.

  The heat welding layer 8 of the jacket material 2 is a portion having the highest gas permeability in the film constituting the jacket material 2, and the properties of the heat welding layer 8 greatly affect the heat insulation performance of the vacuum heat insulating material 1 over time. To do. The thickness of the heat-welded layer 8 depends on the stability of the sealing quality in the reduced-pressure sealing process, the suppression of gas intrusion from the end face of the heat-welded part, and the surface by heat conduction when a metal foil is used as the gas barrier layer 7. Considering the heat leak of 25 μm to 60 μm is suitable.

  As the material of the heat-welding layer 8, an unstretched polypropylene film, a high-density polyethylene film, a linear low-density polyethylene film, or the like can be used. It is more effective to use a film.

  Moreover, although the bag shape of the jacket material 2 includes a four-side seal bag, a gusset bag, a three-side seal bag, a pillow bag, a center tape seal bag, etc., it is not particularly specified.

  In addition, in order to further improve the initial heat insulation performance and the time heat insulation performance of the vacuum heat insulating material 1, it is also possible to use a getter material such as a gas adsorbent or a moisture adsorbent.

  The adsorption mechanism may be any of physical adsorption, chemical adsorption, occlusion, and sorption, but a substance that acts as a non-evaporable getter is good.

  Specifically, physical adsorbents such as synthetic zeolite, activated carbon, activated alumina, silica gel, dosonite, hydrotalcite and the like.

  As the chemical adsorbent, alkali metal or alkaline earth metal oxides, alkali metal or alkaline earth metal hydroxides, etc. can be used, and in particular, lithium oxide, lithium hydroxide, calcium oxide, calcium hydroxide, Magnesium oxide, magnesium hydroxide, barium oxide, and barium hydroxide are effective.

  In addition, calcium sulfate, magnesium sulfate, sodium sulfate, sodium carbonate, potassium carbonate, calcium chloride, lithium carbonate, unsaturated fatty acid, iron compound and the like also act effectively.

  Further, it is more effective to apply a getter material obtained by singly or alloying materials such as barium, magnesium, calcium, strontium, titanium, zirconium, and vanadium.

  Furthermore, in order to adsorb and remove at least nitrogen, oxygen, moisture, and carbon dioxide, the getter material can be applied in various mixtures.

  The manufacturing method of the vacuum heat insulating material 1 may be as follows. First, the jacket material 2 is produced, and then the core material 3 is inserted into the jacket material 2 to depressurize and seal the inside. A material 3 and a cover material 2 made of a roll or sheet-like laminate film are installed, and the cover material 2 is heat-welded after the roll or sheet-like cover material 2 is placed along the core material 3. By doing so, the vacuum heat insulating material 1 may be produced and is not particularly specified.

(Embodiment 2)
As shown in FIG. 3, the vacuum heat insulating material in the second embodiment of the present invention is provided with holes 9 in the side surface of the plastic film bag 4b containing the core material 3, and other configurations are the same as those in the embodiment. It is the same as the vacuum heat insulating material 1 of form 1.

  In the present embodiment, since the air inside the bag 4b can be depressurized also from the side surface of the plastic film bag 4b containing the core material 3, the decompression time during the production of the vacuum heat insulating material is the case of the first embodiment. Was even less than 10 seconds.

  Further, since the upper and lower surfaces of the bag 4b containing the core material 3 are not perforated in the same manner as in the first embodiment, the core material is reduced during the vacuum insulation material production and decompression as in the first embodiment. It is possible to reduce the possibility of pinhole generation that occurs when three flat fiber tips pierce the jacket material 2 from the inside, and even if 1000 sheets of vacuum heat insulating material are produced, Similarly, no pinhole was generated, and the thermal conductivity of all 1,000 sheets was maintained at 0.0025 (W / mK).

(Embodiment 3)
As shown in FIG. 4, the vacuum heat insulating material in Embodiment 3 of the present invention is provided with a small hole 10 on the entire surface of a plastic film bag 4c containing a core material 3, and other configurations are carried out. It is the same as the vacuum heat insulating material 1 of the form 1.

  In the present embodiment, since the air inside the bag 4c can be depressurized from the entire surface of the plastic film bag 4c containing the core material 3, the depressurization time for producing the vacuum heat insulating material is smaller than that in the case of the second embodiment. Could be further reduced by 10 seconds.

  Further, since only the small holes are opened on the upper and lower surfaces of the bag 4c in which the core material 3 is placed, the fiber tip on the plane of the core material 3 is covered with the jacket material when the vacuum heat insulating material is produced and decompressed as in the case of the first embodiment. The possibility of pinholes occurring when piercing 2 from the inside can be reduced, and even when 1000 sheets of vacuum heat insulating material are produced, no pinholes are generated as in the case of the first embodiment. The conductivity of all 1000 sheets was maintained at 0.0025 (W / mK).

(Embodiment 4)
As shown in FIG. 5, the vacuum heat insulating material in Embodiment 4 of the present invention is such that the bag mouth of the plastic film bag 4 d containing the core material 3 is all closed by the heat welding part 11. The configuration is the same as the vacuum heat insulating material 1 of the first embodiment.

  In the present embodiment, since the core material 3 can be smoothly inserted into the jacket material 3 when the core material 3 at the time of vacuum heat insulation material production is inserted into the jacket material 2, The working time can be reduced by 10 seconds.

(Embodiment 5)
As shown in FIG. 6, the vacuum heat insulating material according to the fifth embodiment of the present invention includes the plastic film bag 4e directly containing the core material 3e and the core material 3e being placed in a double layer. The possibility of pinholes occurring when the fiber tip in the plane of the core material 3 pierces the jacket material 2 from the inside can be reduced.

  Therefore, even if a weight of 2 kg is dropped from a height of 1 m on the plane portion of the 10 vacuum heat insulating materials, the initial performance is 0.0025 without generating a pinhole in the jacket material 2 in all the vacuum heat insulating materials. (W / mK) was maintained. On the other hand, when a weight of 2 kg is dropped from a height of 1 m onto 10 planes of vacuum heat insulating material with a single plastic film bag containing the core material 3, the three vacuum heat insulating materials are covered with the jacket material 2. The occurrence of pinholes was confirmed, and the initial performance could not be maintained.

(Embodiment 6)
As shown in FIG. 7, the vacuum heat insulating material 1f according to the sixth embodiment of the present invention is a laminate film in which the outer cover material 2f has a protective layer 5f, a gas barrier layer 7f, and a heat welding layer 8f, and the protective layer 5f has one layer. The other configurations are the same as those of the vacuum heat insulating material 1 of the first embodiment.

  Therefore, since the core material 3 is contained in the plastic bag 4f, the tip fiber in the plane of the core material 3f is resistant to damage when the fiber tip in the plane of the core material 3f pierces the jacket material 2f from the inside when the vacuum heat insulating material 1f is produced and decompressed. At the same time as the piercing property can be improved, the protective layer 2f having a laminate structure, which usually has a two-layer structure, can be formed into a single layer structure. Therefore, the cost can be further reduced as compared with the vacuum heat insulating materials of the first to fifth embodiments. It is possible to reduce the possibility of pinholes occurring when the fiber tip in the plane of the core material 3f pierces the jacket material 2f from the inside when the vacuum heat insulating material 1f is produced and decompressed.

(Embodiment 7)
As shown in FIG. 8, the vacuum heat insulating material 1g according to the seventh embodiment of the present invention is a vacuum heat insulating material obtained by putting the core material 3g into a plastic film bag 4g and inserting it into the outer cover material 2g, and depressurizing the inside. The material is press-molded with a mold having convex portions, and a groove 12 having a depth of 8 mm is processed as shown in FIG.

  The core material 3g is put in a plastic film bag 4g and further covered with an outer cover material 2g to produce a vacuum heat insulating material 1g. Therefore, even if the groove 12 having a depth of 8 mm is processed, the core material 3g fiber It is possible to prevent the occurrence of pinholes that occur when the tip pierces the jacket material 2g from the inside, and the thermal conductivity can be maintained at 0.0025 (W / mK). On the other hand, when a groove with a depth of 8 mm is applied to the vacuum heat insulating material in which the core material 3g is directly covered with the outer jacket material 2g, a pinhole is generated when the core material 3g fiber tip pierces the outer jacket material 2g from the inside. Was confirmed, and the thermal conductivity was deteriorated from 0.0025 (W / mK) to 0.0200 (W / mK) or more.

(Embodiment 8)
FIG. 9 is a cross-sectional view of the main body portion of the refrigerator in the eighth embodiment of the present invention.

  The refrigerator main body 13 has a vacuum having the same configuration as the vacuum heat insulating material of any one of the first to seventh embodiments on one side of a space constituted by an outer box 14 made of steel plate and an inner box 15 made of ABS resin. A heat insulating material 1 h is disposed, and a space other than the vacuum heat insulating material 1 h is foamed and filled with a hard urethane foam 16. The refrigerator main body 13 has a refrigerator compartment 13a opened at the upper front, a freezer compartment 13b opened at the lower front, and a machine room 17 opened at the lower rear, and the compressor 18 is arranged in the machine compartment 17. .

  In the present embodiment, the vacuum heat insulating material 1h is installed, which prevents the generation of pinholes more reliably when the tip of the core fiber of the vacuum heat insulating material 1h pierces the jacket material from the inside, and maintains the heat insulating performance for a long time. Therefore, a refrigerator that can save energy for a long time can be provided. Therefore, when the power consumption of the refrigerator was measured, it was possible to reduce power consumption by 20% compared to the refrigerator not equipped with the vacuum heat insulating material 1h.

  As described above, the vacuum heat insulating material according to the present invention can reduce the possibility of pinholes occurring when the fiber tip of the core material plane pierces the jacket material from the inside. It can be used even in an environment where a deep groove is attached to the material or an external impact is applied to the vacuum heat insulating material.

Sectional drawing of the vacuum heat insulating material in Embodiment 1 of this invention Sectional drawing of the principal part of the vacuum heat insulating material in Embodiment 1 of this invention Side view of the plastic film bag used for the vacuum heat insulating material in Embodiment 2 of this invention Side view of the plastic film bag used for the vacuum heat insulating material in Embodiment 3 of this invention The top view of the plastic film bag used for the vacuum heat insulating material in Embodiment 4 of this invention Sectional drawing which shows the inside of the plastic film bag used for the vacuum heat insulating material in Embodiment 5 of this invention Sectional drawing of the vacuum heat insulating material in Embodiment 6 of this invention Sectional drawing of the vacuum heat insulating material in Embodiment 7 of this invention Sectional drawing of the main-body part of the refrigerator in Embodiment 8 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vacuum heat insulating material 2, 2f, 2g Cover material 3, 3e, 3g Core material 4, 4b, 4c, 4d, 4e, 4f, 4g Plastic film bag 5, 5f Protective layer 6 Protective layer 7, 7f Gas barrier layer 8 8f Heat welding layer 9 hole 10 small hole 11 heat welding part 12 groove 13 refrigerator main body 14 outer box 15 inner box

Claims (10)

  The core material is a polyhedron molded body formed by adding a binder to inorganic fibers, and the core material having a binder concentration in the surface layer of the board-shaped molded body is higher than that of the other layers. A vacuum heat insulating material, characterized in that it is put in a plastic film bag with an opening, covered with an outer cover material of a laminate structure, and the inside is decompressed.   The vacuum heat insulating material according to claim 1, wherein a hole is provided in a side surface of the bag of the plastic film containing the core material.   The vacuum heat insulating material according to claim 1 or 2, wherein a large number of small holes are provided on the entire surface of the plastic film bag.   The vacuum heat insulating material according to any one of claims 1 to 3, wherein all the mouths of the plastic film bag are closed by heat welding.   The vacuum heat insulating material according to any one of claims 1 to 4, wherein the plastic material bag is doubled to contain the core material.   The vacuum heat insulating material according to any one of claims 1 to 5, wherein the plastic film is polyethylene.   The cover material is a laminate film having at least a heat-fusible layer, an outer gas barrier layer, and an outer protective layer, and the protective layer is a single layer. The vacuum heat insulating material as described in any one of 6.   The vacuum heat insulating material according to any one of claims 1 to 7, wherein the protective layer is polyethylene terephthalate.   The vacuum heat insulating material according to any one of claims 1 to 8, wherein the vacuum heat insulating material is press-molded with a mold having a convex portion and groove processing is performed.   The outer box, the inner box, the foam heat insulating material filled in the space formed by the outer box and the inner box, and any one of claims 1 to 9 attached to the inner wall of the outer box or the inner box A refrigerator comprising a heat insulating box provided with the vacuum heat insulating material according to one item.

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