WO2010116720A1 - Vacuum insulation material and device provided with same - Google Patents
Vacuum insulation material and device provided with same Download PDFInfo
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- WO2010116720A1 WO2010116720A1 PCT/JP2010/002504 JP2010002504W WO2010116720A1 WO 2010116720 A1 WO2010116720 A1 WO 2010116720A1 JP 2010002504 W JP2010002504 W JP 2010002504W WO 2010116720 A1 WO2010116720 A1 WO 2010116720A1
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- Prior art keywords
- heat insulating
- insulating material
- vacuum heat
- outer packaging
- vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
- F25D23/06—Walls
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2201/00—Insulation
- F25D2201/10—Insulation with respect to heat
- F25D2201/14—Insulation with respect to heat using subatmospheric pressure
Definitions
- the present invention relates to a vacuum heat insulating material and a device provided with the same.
- Refrigerator, cold box, heat box, etc. used for heating, cooling, and holding various foods, and dryers that blow dry air by blowing warm air on the object to be dried
- heat insulating materials having various structures and performances have been used.
- vacuum heat insulating materials are excellent in heat insulating performance, and are widely used in devices such as household refrigerators that require heat insulation.
- a vacuum heat insulating material is generally obtained by filling a core material made of an inorganic material into an outer packaging material, sealing the outer packaging material, and maintaining the inside of the outer packaging material in a reduced pressure state.
- vacuum heat insulating material water vapor may be generated from the core material filled in the outer packaging material, or gas may enter the outer packaging material through the outer packaging material.
- the internal pressure of the outer packaging material is increased by such water vapor or gas, the reduced pressure state is deteriorated and the heat insulation performance is lowered.
- some conventional vacuum heat insulating materials include a moisture adsorbent or the like inside the outer packaging material in order to prevent the internal pressure of the outer packaging material from increasing.
- a reactive moisture adsorbent is enveloped by a jacket material together with a core material and sealed. Even when the internal pressure of the vacuum heat insulating material increases due to the release of water from the core material after the vacuum heat insulating material is produced, the reactive water adsorbent adsorbs and removes the water, thereby preventing the heat insulating performance from being deteriorated.
- the reactive moisture adsorbent metal oxides such as calcium chloride, calcium oxide, lithium chloride and magnesium oxide, and physical adsorbents such as silica gel and zeolite are used.
- Patent Document 2 Japanese Patent Application Laid-Open No. 2002-48466
- the degree of vacuum of the vacuum heat insulating material deteriorates due to the gas generated from the core material or the gas that permeates and penetrates from the outside, and thus the heat insulating material.
- an adsorbent is charged into the jacket material together with the core material.
- the adsorbent zeolite, activated carbon, metal oxides such as calcium chloride and magnesium oxide, hydroxides such as magnesium hydroxide and calcium hydroxide, alloys such as barium-lithium alloy, and the like are used.
- Patent Document 3 a core material made of glass wool made of glass fiber as an inorganic fiber laminated material is sealed under reduced pressure in a jacket material.
- the density of the core material in the vacuum heat insulating material is 200 to 270 kg / m 3
- the core material after opening the outer cover material contains 75% or more of glass fibers having a fiber length of 100 ⁇ m or more.
- the adsorbent adsorbs water, such as the vacuum heat insulating material described in JP 2002-161994 A (Patent Document 1) and the vacuum heat insulating material described in JP 2002-48466 A (Patent Document 2).
- Patent Document 1 the vacuum heat insulating material described in JP 2002-161994 A
- Patent Document 2 the vacuum heat insulating material described in JP 2002-48466 A
- an object of the present invention is to provide a vacuum heat insulating material that can exceed the improvement limit of the conventional heat insulating performance and has excellent heat insulating performance, and a device including the same.
- the present inventors As a result of intensive studies in order to solve the problems of the conventional vacuum heat insulating material, the present inventors, as a result, when the heat-welded portion of the outer packaging material of the vacuum heat insulating material is formed of a material containing hydrocarbon, It has been found that the above object can be achieved by accommodating an adsorbent that adsorbs hydrocarbon gas inside the outer packaging material. Based on this knowledge, the vacuum heat insulating material according to the present invention has the following characteristics.
- the vacuum heat insulating material according to the present invention includes an outer packaging material, a core material accommodated in the outer packaging material, and an adsorbing material accommodated in the outer packaging material.
- the outer packaging material has a thermal welding part where the outer packaging materials come into contact with each other and are thermally welded.
- the heat welded portion is formed of a material containing hydrocarbons.
- the adsorbent is an adsorbent that adsorbs hydrocarbon gas.
- the inventors have conducted various verification experiments, and when the heat welded portion of the outer packaging material of the vacuum heat insulating material is formed of a material containing hydrocarbon, the vacuum heat insulating material is used when the heat welded portion is heat welded. It has been found that the heat insulation performance of is adversely affected.
- the heat-welded portion of the outer packaging material is heat-welded and sealed, so that hydrocarbon gas generated from the heat-welded portion during heat welding not only diffuses outside the vacuum heat-insulating material, but also the vacuum heat-insulating material. It also diffuses inside the outer packaging material.
- the hydrocarbon gas diffused inside the outer packaging material of the vacuum heat insulating material is sealed as it is inside the outer packaging material.
- the vacuum heat insulating material is sealed by thermally welding the heat-sealed portion of the outer packaging material under a reduced pressure condition, so that when the hydrocarbon gas is diffused inside the outer packaging material, the degree of vacuum inside the outer packaging material is reduced. Becomes lower.
- the heat insulation of a vacuum heat insulating material falls by the vacuum degree inside an outer packaging material becoming low.
- an adsorbent that adsorbs hydrocarbon gas is accommodated inside the outer packaging material, and the hydrocarbon gas that diffuses inside the outer packaging material is adsorbed by the adsorbent.
- the hydrocarbon gas that diffuses inside the outer packaging material is adsorbed by the adsorbent.
- the present inventors have produced a fiber constituting the core material for vacuum heat insulating material by a continuous filament method. It has been found that the above object can be achieved by including at least a plurality of inorganic fibers formed.
- the continuous filament method is a fiber manufacturing method in which molten filaments are continuously drawn down through a bushing nozzle, drawn, and fiberized to produce continuous filaments.
- the vacuum heat insulating material according to the present invention preferably has the following characteristics.
- the core material is preferably configured by laminating a plurality of non-woven fabrics.
- the nonwoven fabric preferably includes at least a plurality of inorganic fibers produced by a continuous filament method. In the nonwoven fabric, it is preferable that most of the plurality of inorganic fibers extend in a direction substantially parallel to the surface of the nonwoven fabric.
- the continuous filament method a large number of fibers with extremely small variations in fiber diameter can be produced. Moreover, the inorganic fiber manufactured by the continuous filament method has very high straightness of each fiber. For this reason, by cutting a large number of inorganic fibers manufactured by the continuous filament method into a substantially constant length, a straightness of a large number of inorganic fibers having substantially the same length and having a very small variation in fiber diameter can be obtained. It can be obtained in a very high state.
- the nonwoven fabric constituting the core material includes at least a plurality of inorganic fibers produced by the continuous filament method. Therefore, when forming a nonwoven fabric using such a plurality of inorganic fibers, each inorganic fiber is formed on the surface of the nonwoven fabric. When arranged in a parallel direction, a plurality of inorganic fibers can be easily aligned so that most of the inorganic fibers extend in a direction substantially parallel to the surface of the nonwoven fabric. At this time, most of the plurality of inorganic fibers extend in a direction substantially parallel to the surface of the nonwoven fabric, but are in close contact with each other and do not align with the parallel direction, and are in a random direction within the plane forming the surface of the nonwoven fabric.
- the average fiber diameter of the inorganic fibers is preferably 3 ⁇ m or more and 15 ⁇ m or less, and the average fiber length of the inorganic fibers is preferably 3 mm or more and 15 mm or less.
- the heat conductivity of the core material can be reduced most, and a vacuum heat insulating material having the most excellent heat insulating performance can be obtained.
- the inorganic fiber is preferably a glass fiber.
- the glass fiber has a lower thermal conductivity than other inorganic fibers, for example, ceramic fibers, the heat insulating performance of the core material can be further improved by reducing the thermal conductivity of the material itself.
- An apparatus includes an outer box, an inner box disposed inside the outer box, and a vacuum heat insulating material disposed between the outer box and the inner box. It is preferable that a vacuum heat insulating material is included.
- a refrigerator efficiently cools food stored in the inner box.
- the washing / drying machine efficiently blows warm air on an object to be dried such as clothes housed in the inner box and efficiently dries it.
- a vacuum heat insulating material is disposed between the outer box and the inner box. If the heat insulation performance of the vacuum insulation material placed between the outer box and the inner box is excellent, the energy required to make the inside of the inner box lower or higher than the outside of the outer box will be reduced. Can save energy.
- the vacuum heat insulating material disposed between the outer box and the inner box includes the above vacuum heat insulating material, it is possible to provide a device excellent in heat insulating performance and energy saving.
- FIG. 1st Embodiment of this invention it is a perspective view showing typically an arrangement (A) of a core material and an outer packaging material, and a state (B) inside a vacuum heat insulating material when the inside of the outer packaging material is decompressed. .
- It is a top view which shows typically the distribution state of the glass fiber which comprises the nonwoven fabric used for the core material of a vacuum heat insulating material as one embodiment of this invention.
- It is a scanning electron micrograph (magnification 100 times) which shows the distribution state before compression of the glass fiber which comprises the nonwoven fabric used for the core material of a vacuum heat insulating material as one embodiment of this invention.
- the present inventors have conducted various verification experiments, and when the heat-welded portion of the outer packaging material of the vacuum heat insulating material is formed of a material containing hydrocarbon, the heat-welded portion is heat-welded. It was found that the heat insulation performance of the vacuum heat insulating material is adversely affected.
- the verification experiment conducted by the present inventors will be described below.
- FIG. 1 is a front view (A) showing an initial state of the vacuum heat insulating material used in the verification experiment 1, and a cross section when the vacuum heat insulating material is viewed from the direction indicated by the line BB in FIG.
- FIG. 4B is a front view showing a state when the second thermal welding is performed, and a front view showing the state when the third thermal welding is performed.
- the core material 10 is accommodated in a gas barrier outer packaging material 20 formed in a bag shape.
- the outer packaging material 20 is thermally welded and sealed at the heat welded portion 30 and the heat welded portion 31.
- nylon was used for the outermost layer 21
- two layers of aluminum-deposited PET resin and aluminum foil were used for the intermediate layer 22
- two types of polyethylene resins were used for the innermost layer 23.
- the core material 10 is configured by laminating a plurality of nonwoven fabrics 11.
- Each nonwoven fabric 11 is produced by a papermaking method using glass fibers which are examples of inorganic fibers and a small amount of an organic binder. Specifically, the core material 10 was produced as follows.
- Glass chopped strands (manufactured by Owens Corning Corporation) having an average fiber diameter of 10 ⁇ m and an average fiber length of 10 mm were poured into water so that the concentration became 0.5% by mass, and Emanon ( (Registered trademark) 3199 (manufactured by Kao Corporation) was added to 1 part by mass with respect to 100 parts by mass of the glass chopped strands, and stirred to prepare a glass chopped strand slurry.
- the obtained glass chopped strand slurry was made by a wet paper making method to prepare a web.
- the obtained web was impregnated with a liquid obtained by diluting an acrylic emulsion (GM-4 manufactured by Dainippon Ink & Chemicals, Inc.) with water so that its solid content concentration was 3.0% by mass, and the moisture content of the web was adjusted by sucking moisture so as to be 0.7% by mass with respect to the glass fiber mass.
- the nonwoven fabric 11 used for the core material 10 was produced by drying a web.
- the nonwoven fabric 11 used for the obtained core material 10 had a rice weight of 100 g / m 2 .
- a plurality of nonwoven fabrics 11 were laminated to form the core material 10.
- the core material 10 had a long side of 435 mm, a short side of 400 mm, and a thickness of 9 mm.
- the outer packaging material 20 was sealed as follows. First, the three sides of the outer packaging material 20 were thermally welded at the heat welding portion 30, and then the core material 10 was filled therein. Next, the heat-welded portion 31 of the outer packaging material 20 filled with the core material 10 was heat-welded under reduced pressure in a vacuum chamber. Thus, the core material 10 was sealed in the outer packaging material 20, and the vacuum heat insulating material 2 was produced. The heat welded portion 31 was heat welded at a temperature of 170 to 220 ° C. when the Pirani gauge instruction value installed in the vacuum chamber reached 0.009 Torr. Thus, the heat conductivity of the vacuum heat insulating material 2 produced was measured.
- heat welding was performed at the heat welding portion 32 inside the heat welding portion 31, and the thermal conductivity was measured in the same manner. Then, in the heat welding part 33 inside the heat welding part 32, further heat welding was performed and the thermal conductivity was measured.
- the heat welding of the heat welding parts 32 and 33 was performed at a temperature of 170 to 220 ° C. as with the heat welding part 31.
- the measurement of thermal conductivity is performed by using a vacuum heat insulating material provided with an outer packaging material using HDPE (high density polyethylene) as a heat welding layer as a polyethylene resin of the innermost layer 23 of the outer packaging material 20, and LLDPE (linear low density). It carried out about two types of vacuum heat insulating materials provided with the outer packaging material which used polyethylene as a heat welding layer.
- the thermal conductivity was measured using a thermal conductivity measuring device (HC-074 / 600 manufactured by Eihiro Seiki Co., Ltd.). The average temperature of the vacuum heat insulating material at the time of measurement was 24 ° C.
- FIG. 2 is a diagram showing a change in the thermal conductivity of the vacuum heat insulating material depending on the number of times of thermal welding.
- the thermal conductivity when the vacuum heat insulating material 2 is formed that is, when heat-welded at the heat welding portion 31 is 1. 2.
- heat conductivity rose to 1.3 and the heat insulation performance fell.
- heat conductivity was still 1.3.
- the polyethylene resin of the outer packaging material 20 is thermally decomposed by further thermal welding of the thermal welding part 32 and the thermal welding part 33 inside the thermal welding part 31. It is considered that the hydrocarbon gas thus diffused into the outer packaging material 20. Since the outermost heat welding portion 31 is thermally welded and the outer packaging material 20 is sealed, the hydrocarbon gas is confined inside the outer packaging material 20. Therefore, it is thought that the vacuum degree of the vacuum heat insulating material 2 fell and the heat conductivity fell.
- the vacuum heat insulating material 2 shown in FIGS. 1A and 1B used in the verification experiment 1 described above was used.
- a material using HDPE as the polyethylene resin of the innermost layer 23 of the outer packaging material 20 was used.
- the thermal conductivity of the vacuum heat insulating material 2 at this time was measured. Thereafter, 1/5 of the total length of the heat welding part 31 was opened, and the inside of the vacuum heat insulating material 2 was returned to atmospheric pressure. Next, the 1/5 portion opened in the heat welding part 31 was again heat welded under a reduced pressure condition. The thermal conductivity of the vacuum heat insulating material 2 at this time was measured. In this way, the thermal conductivity of the vacuum heat insulating material sealed by heat-sealing the outer packaging material 20 was measured in the same manner as in the verification experiment 1. The total length of the heat welding part 31 was 470 mm.
- the influence of the hydrocarbon gas generated when only one-fifth of the total length of the heat welded portion 31 is heat welded is considered as the heat welded portion 31. This can be compared with the influence of the hydrocarbon gas generated when the entire length of is thermally welded.
- FIG. 3 is a diagram showing a change in the thermal conductivity of the vacuum heat insulating material depending on the length of the heat welded portion.
- the thermal conductivity once heat-welded over the entire length of the heat-welded portion 31 was 1.5.
- the heat conductivity when heat-welded again was 1.3.
- the thermal conductivity of the vacuum heat insulating material is the number of times of thermal welding. It has been found that the larger the amount, the larger, and the longer the length of the heat-welded portion that is heat-welded when the outer packaging material is finally sealed, the larger the length.
- an adsorbent that adsorbs hydrocarbon gas is accommodated inside the outer packaging material, and the hydrocarbon gas that diffuses inside the outer packaging material is adsorbed by the adsorbent.
- the hydrocarbon gas that diffuses inside the outer packaging material is adsorbed by the adsorbent.
- the present inventors have an adsorbent that adsorbs hydrocarbon gas inside the outer packaging material. It was found that a vacuum heat insulating material having excellent heat insulating performance can be obtained by being accommodated. Based on this knowledge, the vacuum heat insulating material according to the present invention has the following characteristics.
- the vacuum heat insulating material according to the present invention includes an outer packaging material, a core material accommodated in the outer packaging material, and an adsorbing material accommodated in the outer packaging material.
- the outer packaging material has a thermal welding part where the outer packaging materials come into contact with each other and are thermally welded.
- the heat welded portion is formed of a material containing hydrocarbons.
- the adsorbent is an adsorbent that adsorbs hydrocarbon gas.
- FIG. 4 is a cross-sectional view schematically showing the configuration of the vacuum heat insulating material as the first embodiment of the present invention.
- 4A shows a state before the inside of the outer packaging material is decompressed
- FIG. 4B shows a state when the inside of the outer packaging material is decompressed.
- the core material 100 and the adsorbent material 400 are accommodated in the gas barrier outer packaging material 200 formed in a rectangular parallelepiped bag shape.
- the outer packaging material 200 is thermally welded on three of the four sides.
- the remaining one-side heat welded portion 300 is heat-welded in a reduced pressure state after the core material 100 and the adsorbent 400 are filled, as will be described later.
- the adsorbent 400 is disposed in the vicinity of the heat welding portion 300 that is heat-welded after being in a reduced pressure state.
- the adsorbent 400 may be disposed at other positions inside the outer packaging material 200.
- the core material 100 is formed by laminating a plurality of nonwoven fabrics 110.
- Each nonwoven fabric 110 is produced by a papermaking method using glass fibers which are examples of inorganic fibers and a small amount of an organic binder.
- the binder it is possible to use an inorganic binder.
- the flexibility of bending of the fiber assembly, that is, the nonwoven fabric 110 is inferior, and the cost when used as a product is lower than that of an organic binder. Since it becomes expensive compared with the case where it uses, it is preferable to use an organic binder.
- the amount of binder should be kept as small as possible.
- adsorbent 400 for example, a material in which potassium permanganate is supported on a porous base material such as activated alumina or zeolite, or a material in which bromine is attached to a porous member such as activated carbon is used.
- the adsorbent 400 only needs to adsorb hydrocarbon gas, and is not limited to these.
- the outermost layer 210 is made of polyethylene terephthalate (PET) resin
- the intermediate layer 220 is made of an ethylene-vinyl alcohol copolymer resin having an aluminum vapor deposition layer
- the innermost layer 230 is made of Gas barrier film using low-density polyethylene resin such as high-density polyethylene resin or linear low-density polyethylene resin, nylon is used for outermost layer 210, and two layers of aluminum-deposited PET resin and aluminum foil are used for intermediate layer 220
- the gas barrier film include a high-density polyethylene resin and a low-density polyethylene resin such as a linear low-density polyethylene resin.
- the heat welding part 300 is formed in a part of the innermost layer 230.
- an adsorbent such as a gas adsorbent or a moisture adsorbent in addition to the adsorbent 400 in the vacuum heat insulating material 1. preferable.
- the core material 100 and the adsorbent material 400 are filled in the outer packaging material 200, they are accommodated in a vacuum chamber.
- the outer packaging material 200 is thermally welded at the thermal welding portion 300.
- the heat welding temperature is preferably 170 to 220 ° C. as the heat welding temperature for maintaining the seal strength.
- a heat welding method a hot plate sealing method in which a heat plate is heated and conducted by a nichrome wire embedded in a hot plate made of brass or copper, and the heat welding portion 300 is overheated and sealed, or a heating element is used.
- the core material 100 is compressed by the atmospheric pressure outside the outer packaging material 200, and the nonwoven fabrics 110 constituting the core material 100 are pressed against each other. Touch as you can.
- the density of the core material 100 in a state where the inside of the outer packaging material 200 is decompressed is included in the range of 100 to 400 kg / m 3 .
- the nonwoven fabric 110 is configured, and the nonwoven fabric 110 is laminated to configure the core material 100.
- the core material 100 and the adsorbent material 400 are disposed inside the outer packaging material 200 and sealed under reduced pressure. 1 is constructed.
- FIG. 5 schematically shows an arrangement (A) of the core material and the outer packaging material and an internal state (B) of the vacuum heat insulating material when the inside of the outer packaging material is decompressed as one embodiment of the present invention. It is a perspective view. Only a part of each nonwoven fabric, core material, and outer packaging material is shown.
- a plurality of nonwoven fabrics 110 are laminated to form the core material 100.
- the core material 100 is covered with an outer packaging material 200.
- the outer packaging material 200 is gas barrier, is formed in a bag shape, and covers the entire core material 100.
- the core material 100 is compressed.
- the nonwoven fabrics 110 come into contact with each other so as to be pressed against each other.
- non-woven fabric 110 of the core material 100 one formed by glass fibers manufactured by a continuous filament method or one formed by glass wool can be used.
- the present inventors have used as a core a non-woven fabric configured to contain inorganic fibers of specific conditions. It has been found that the heat insulating performance of the vacuum heat insulating material is remarkably improved by using it.
- the nonwoven fabric 110 constituting the core material 100 used in the vacuum heat insulating material 1 of the present invention includes at least a plurality of inorganic fibers produced by the continuous filament method. Configured.
- inorganic fibers examples include glass fibers, ceramic fibers, rock wool fibers, etc., but small diameter fibers necessary for constituting the core material of the present invention are distributed at a relatively low price due to mass production, In view of the low thermal conductivity of the material itself, glass fibers are preferably used as the inorganic fibers.
- a nonwoven fabric produced by a wet papermaking method using glass fibers cut to a certain length is used as a core material of a vacuum heat insulating material.
- the glass fiber cut to a certain length is a glass fiber which is a filamentous continuous filament of uniform thickness formed by drawing molten glass from a number of nozzles by a continuous filament method. Thousands are bundled and wound into a strand, and the strand is cut to a predetermined length with a guillotine cutter or the like. What cut
- the glass fiber thus obtained is a continuous filament cut into a predetermined length to obtain a predetermined length. Therefore, the glass fiber is extremely straight and highly rigid, and is a substantially uniform fiber. It has a diameter and a substantially circular cross section. That is, according to the continuous filament method, a large number of fibers with extremely small variation in fiber diameter can be produced. Moreover, the inorganic fiber manufactured by the continuous filament method has very high straightness of each fiber. For this reason, by cutting a large number of inorganic fibers manufactured by the continuous filament method into a substantially constant length, a straightness of a large number of inorganic fibers having substantially the same length and having a very small variation in fiber diameter can be obtained. It can be obtained in a very high state.
- Nonwoven fabrics arranged to be dispersed can be obtained.
- FIG. 6 is a plan view schematically showing the distribution state of the glass fibers constituting the nonwoven fabric used for the core material of the vacuum heat insulating material as one embodiment of the present invention.
- FIG. 6 shows a nonwoven fabric composed of two glass fiber layers.
- FIG. 7 is a plane electron micrograph (magnification 100 times) showing the distribution state before compression of the glass fibers constituting the nonwoven fabric used for the core material of the vacuum heat insulating material as one embodiment of the present invention
- the plurality of glass fibers 111 forming the upper layer and the glass fibers 112 forming the lower layer extend in a direction substantially parallel to the surface of the nonwoven fabric 110, but in close contact with each other in the parallel direction. They are not aligned, but are aligned so as to be distributed in a random direction within a plane forming the surface of the nonwoven fabric 110. Moreover, as shown in FIGS. 7 and 8, it can be seen that the straightness of each fiber is extremely high. In addition, it can be seen that most of the fibers extend in a direction substantially parallel to the surface of the nonwoven fabric, but are aligned so as to be dispersed in a random direction within a plane forming the surface of the nonwoven fabric.
- the nonwoven fabric 110 which comprises the core material of this invention contains at least the glass fiber which is an example of the some inorganic fiber manufactured by the continuous filament method, the nonwoven fabric 110 is used using such a some glass fiber.
- a plurality of glass fibers 111 and 112 are arranged so as to extend in a direction substantially parallel to the surface of the nonwoven fabric. Glass fibers can be easily aligned.
- most of the plurality of glass fibers 111 and 112 extend in a direction substantially parallel to the surface of the nonwoven fabric 110, but do not align with each other in close contact with each other and form a surface of the nonwoven fabric 110. To be distributed in a random direction.
- the presence of glass fibers filling between the plurality of glass fibers constituting the core material can be minimized, and the presence of glass fibers entangled between the plurality of glass fibers can be minimized. Therefore, it is possible to prevent heat conduction from occurring between the glass fibers. For this reason, by preventing the occurrence of heat conduction along the thickness direction of the core material, the thermal conductivity of the core material can be reduced, and it becomes possible to exceed the improvement limit of the conventional heat insulation performance, The core material for vacuum heat insulating materials which has the heat insulation performance and the vacuum heat insulating material provided with the core material can be obtained.
- the glass fiber composition is not particularly limited, and C glass, D glass, E glass, and the like can be used, but E glass (aluminoborosilicate glass) is preferably employed because of its availability.
- the inorganic fiber forming the nonwoven fabric 110 as the core material of this embodiment is a glass fiber having a predetermined length obtained by cutting a continuous filament into a predetermined length, and has an extremely high straightness and a substantially circular shape. It has a cross section. For this reason, unless a plurality of glass fibers dispersed in a random direction are aligned and aligned in parallel, the glass fibers are in contact with each other at a point, so that heat conduction between the glass fibers is remarkably suppressed.
- inorganic fiber materials such as alumina chopped strands using alumina fibers are preferable because they are more expensive than glass fibers and have high thermal conductivity. Absent.
- organic materials generally have lower thermal conductivity than inorganic materials, but do not have rigidity. For this reason, an organic fiber material deform
- the nonwoven fabric 110 is manufactured by a wet papermaking method using at least glass fibers which are an example of a plurality of inorganic fibers manufactured by a continuous filament method. Thereby, most glass fibers 111 and 112 are made to extend in the direction substantially parallel to the surface of the manufactured nonwoven fabric 110 among several glass fibers. Further, a plurality of nonwoven fabrics 110 are laminated.
- the nonwoven fabric 110 is first manufactured by the wet papermaking method at least using the several glass fiber manufactured by the continuous filament method. Thereby, most glass fibers 111 and 112 are made to extend in the direction substantially parallel to the surface of the manufactured nonwoven fabric 110 among several glass fibers. Further, a plurality of nonwoven fabrics 110 are laminated. Thereafter, the laminated nonwoven fabrics 110 are accommodated in the outer packaging material 200, and the interior of the outer packaging material 200 is kept in a reduced pressure state.
- the manufacturing method of the vacuum heat insulating material 1 at least a plurality of glass fibers manufactured by a continuous filament method are used.
- the non-woven fabric 110 is manufactured by the wet papermaking method using such a plurality of glass fibers, when the glass fibers are arranged in a direction parallel to the surface of the non-woven fabric 110, most of the glass fibers 111 and 112 are used.
- a plurality of glass fibers can be easily aligned so as to extend in a direction substantially parallel to the surface of the nonwoven fabric 110.
- most of the plurality of glass fibers 111 and 112 extend in a direction substantially parallel to the surface of the nonwoven fabric 110, but do not align with each other in close contact with each other and form a surface of the nonwoven fabric 110. To be distributed in a random direction. Thereby, even if a plurality of non-woven fabrics 110 are laminated to constitute the core material 100, the presence of glass fibers that fill between the plurality of glass fibers can be minimized, and between the plurality of glass fibers. Since the presence of the glass fiber entangled with the glass fiber can be eliminated as much as possible, it is possible to prevent heat conduction from occurring between the glass fibers.
- the vacuum heat insulating material 1 can be manufactured by accommodating the some nonwoven fabric 110 laminated
- the thermal conductivity of the core material 100 can be lowered, and the improvement limit of the conventional heat insulation performance may be exceeded. It becomes possible and the core material 100 which has the outstanding heat insulation performance and the vacuum heat insulating material 1 provided with the core material 100 can be obtained.
- the nonwoven fabric 110 made of glass fiber used in the present invention is manufactured by a wet papermaking method.
- the wet papermaking method by adding an appropriate dispersant, glass chopped strands obtained by cutting glass fibers into a certain length are monofilamented and dispersed and arranged in layers, and the nonwoven fabric 110 made of glass fibers with very little binding is formed. Obtainable. For this reason, the number of glass fibers arranged in parallel is very small, and most glass fibers 111 and 112 are in contact with each other between adjacent fibers. In this way, the nonwoven fabric 110 having a high compressive strength and a very low thermal conductivity in the thickness direction can be produced. Therefore, such a nonwoven fabric 110 is suitable as the core material 100 of the vacuum heat insulating material 1. .
- Fabrication of the nonwoven fabric 110 by the wet papermaking method employed in the method of manufacturing the vacuum heat insulating material 1 can be performed by using a known papermaking machine such as a long net papermaking machine, a short netting papermaking machine, or an inclined wire type papermaking machine.
- a known papermaking machine such as a long net papermaking machine, a short netting papermaking machine, or an inclined wire type papermaking machine.
- a nonwoven fabric made of glass fiber is used as a heat insulating material having heat resistance, a heat insulating material having fire resistance, or an electrical insulator. For this reason, the nonwoven fabric is required to have a fabric strength that can withstand tearing and breaking, and often requires entanglement of fibers.
- Nonwoven fabrics made of glass fibers used for such applications are often manufactured by a papermaking method using a long net paper machine or a short net paper machine.
- the nonwoven fabric 110 made of glass fiber used for the vacuum heat insulating material 1 is accommodated in the outer packaging material 200 as the core material 100, the strength as a cloth is not so required.
- the papermaking method in which the fiber directions are easily aligned increases the contact area between the fibers, and thus is not preferable for producing the nonwoven fabric 110 made of glass fibers used in the present invention.
- an inclined wire type paper machine capable of making paper at a low inlet concentration is suitable, but is not limited thereto. Absent.
- the glass chopped strand which is an example of the inorganic fiber used for the vacuum heat insulating agent 1 preferably has a glass fiber having a fiber diameter of 3 to 15 ⁇ m and a fiber length of 3 to 15 mm having a composition ratio of 99% or more.
- a glass chopped strand having a fiber diameter of less than 3 ⁇ m or a fiber length of less than 3 mm is expected to be unsuitable for use in the nonwoven fabric 110 constituting the core material 100 of the vacuum heat insulating material 1 as described below.
- Glass fibers having a fiber diameter of less than 3 ⁇ m have low fiber rigidity. Therefore, when a nonwoven fabric is produced by a wet papermaking method, the fibers are bent, entanglement between the fibers occurs, and the contact area between the fibers increases. . Thereby, since heat conduction becomes large and the heat insulation performance of the core material is deteriorated, glass fibers having a fiber diameter of less than 3 ⁇ m are not preferable.
- the glass fiber having a fiber length of less than 3 mm is produced by dispersing the fiber located in the upper layer on the fiber located in the lower layer already dispersed when the nonwoven fabric is produced by the wet papermaking method.
- the upper layer fibers are more likely to be supported on the lower layer fibers at one point, for example, one end of the upper layer fibers hang down to the lower layer and the other in the thickness direction. It is expected to be positioned in a protruding form.
- heat conduction in the length direction of the fiber occurs, and the contact area between the fibers increases. Thereby, heat conduction becomes large and the heat insulating performance of the core material is deteriorated, so that glass fibers having a fiber length of less than 3 mm are not preferable.
- glass fibers having a fiber diameter of 15 ⁇ m or more are used to form a nonwoven fabric and a core material is formed by laminating a plurality of nonwoven fabrics, the number of fiber layers in the thickness direction of the core material is reduced, and the heat transfer path in the thickness direction Becomes shorter and the pore diameter becomes larger when the nonwoven fabric is formed. Accordingly, glass fibers having a fiber diameter of 15 ⁇ m or more are not preferable because they are affected by the thermal conductivity of the gas and reduce the heat insulating performance of the core material.
- the fiber length increases with respect to the fiber diameter, so that the rigidity of the fiber is lowered and the fiber is easily bent, entanglement between the fibers occurs, and the contact area between the fibers is increased. To increase. Thereby, since heat conduction becomes large and the heat insulation performance of the core material is deteriorated, glass fibers having a fiber length of 15 mm or more are not preferable.
- the non-woven fabric made of glass fiber used as the core material of the vacuum heat insulating material of the present invention has no bonding force between fibers. For this reason, it is necessary to use an organic binder in the paper making process in order to prevent the glass fibers from falling off in the manufacturing process of the nonwoven fabric and to prevent mold deformation in the subsequent processing process. However, since the nonwoven fabric is finally encapsulated in the outer packaging material as the core material of the vacuum heat insulating material, it is necessary to minimize the amount of the organic binder used.
- the binder content in the nonwoven fabric made of glass fibers is preferably 15% by mass or less.
- a liquid binder such as a resin emulsion or an aqueous resin solution is generally sprayed by a spray or the like and added to the glass fiber.
- the basis weight of the nonwoven fabric made of glass fiber used as the core material of the vacuum heat insulating material of the present invention is preferably 30 to 600 g / m 2 . If the nonwoven fabric has a rice basis weight of less than 30 g / m 2 , the influence of the thermal conductivity of the gas increases due to the increase in the diameter of the voids present in the nonwoven fabric. Thereby, since the heat insulation performance of a core material falls and the intensity
- the rice tsubo is generally a unit of measurement of the thickness of paper and represents the mass of paper per square meter, and is also referred to as metric basis weight.
- rice tsubo is used as a unit for measuring the thickness of a nonwoven fabric made of glass fibers produced by a wet papermaking method.
- JP-A-2006-17169 (Patent Document 3) describes that the average diameter of inorganic fibers such as glass wool constituting the core of the vacuum heat insulating material is preferably 1 to 5 ⁇ m. . And when the average diameter of the inorganic fiber exceeds 5 micrometers, it describes that the heat insulation performance of the vacuum heat insulating material finally obtained will fall. Certainly, the heat insulation performance of the vacuum heat insulating material is enhanced when the diameter of the inorganic fiber constituting the core material is small. On the other hand, fine inorganic fibers are expensive and have the disadvantages of reducing the dewatering efficiency and reducing the productivity when producing nonwoven fabrics by wet papermaking.
- the fiber diameter is relatively Even if a glass chopped strand having a large size is used, a vacuum heat insulating material that can obtain much higher heat insulating performance than a conventional vacuum heat insulating material can be realized.
- the improvement width of the heat insulating performance of the finally obtained vacuum heat insulating material is almost the same as when using a glass chopped strand with a fiber diameter of 10 ⁇ m. It is negligible. Therefore, considering the productivity, price, and performance, the preferred fiber diameter of the glass chopped strand is 6 to 15 ⁇ m. When the glass fiber of this range is used, the vacuum heat insulating material which has heat insulation performance higher than the conventional vacuum heat insulating material can be obtained with a suitable manufacturing cost.
- the vacuum heat insulating material of the present invention can be manufactured by a known method using a core material having the above-described characteristics.
- a typical method in the configuration of the vacuum heat insulating material 1 shown in FIG. 4, the core material 100 and the adsorbent material 400 are accommodated in a gas barrier outer packaging material 200 formed in a bag shape.
- the outer packaging material 200 for storing the core material 100 in a decompressed state has a high gas barrier property and a protective layer against heat-sealing layers, scratches, etc., and can keep the inner packaging material 200 in a decompressed state for a long period of time. Use something. Further, a plurality of films having such characteristics may be laminated to form the outer packaging material 200.
- the heat insulation performance can be further improved by removing or reducing the organic binder of the core material before the vacuum sealing.
- a thermosetting resin binder such as an acrylic resin
- the binder can be removed by using a thermal decomposition method.
- the binder before enclosing the core material in the outer packaging material, only the binder can be removed by thermal decomposition by treating at a temperature higher than the thermal decomposition temperature of the binder and lower than the melting point of the glass fiber.
- a water-soluble resin binder such as PVA
- the binder can be removed or reduced by washing with warm water or the like in addition to the above method.
- the vacuum heat insulating material 1 includes the outer packaging material 200, the core material 100 accommodated in the outer packaging material 200, and the adsorbent 400 accommodated in the outer packaging material 200.
- the outer packaging material 200 has a heat welding part 300 in which the outer packaging materials 200 come into contact with each other and are thermally welded.
- the heat welding part 300 is formed of a material containing hydrocarbons.
- the adsorbent 400 is an adsorbent 400 that adsorbs hydrocarbon gas.
- the heat welding part 300 of the outer packaging material 200 of the vacuum heat insulating material 1 is formed of a material containing hydrocarbons, hydrocarbon gas is generated when the heat welding part 300 is heat welded.
- the hydrocarbon gas generated from the heat welding part 300 at the time of heat welding not only diffuses outside the vacuum heat insulating material 1. Also, it diffuses inside the outer packaging material 200 of the vacuum heat insulating material 1.
- the hydrocarbon gas diffused inside the outer packaging material 200 of the vacuum heat insulating material 1 is sealed inside the outer packaging material 200 as it is.
- the heat-sealed portion 300 of the outer packaging material 200 is thermally welded and sealed under a reduced pressure state. Therefore, when the vacuum insulating material 1 is sealed in a state where hydrocarbon gas is diffused inside the outer packaging material 200, the outer packaging material 200 is sealed. The degree of vacuum inside becomes low. When the degree of vacuum inside the outer packaging material 200 is lowered, the heat insulating property of the vacuum heat insulating material 1 is lowered.
- the adsorbent 400 that adsorbs hydrocarbon gas is accommodated inside the outer packaging material 200, and the hydrocarbon gas that diffuses inside the outer packaging material 200 is adsorbed by the adsorbent 400.
- the hydrocarbon gas that diffuses inside the outer packaging material 200 is adsorbed by the adsorbent 400.
- FIG. 9 is a side sectional view (A) showing the entire refrigerator and a front view (B) showing the exterior of the refrigerator as a second embodiment of the present invention.
- the refrigerator 3 includes an outer box 301, an inner box 302, a door 303, a partition plate 304, a machine room 306 in which the compressor 305 is disposed, a cooling unit 307,
- the vacuum heat insulating material 320 is provided.
- the outer box 301 and the inner box 302 form an exterior 308 of the refrigerator 3.
- the exterior 308 is formed in a substantially rectangular parallelepiped shape with one surface opened.
- the opening of the exterior 308 is opened and closed by a door 303.
- the interior of the exterior 308 is divided into a plurality of chambers by a partition plate 304.
- the interior of the exterior 308 is divided into, for example, a refrigerating room 311, an ice making room 312, an ice storage room 313, a freezing room 314, and a vegetable room 315.
- a vacuum heat insulating material 320 is arranged between the outer box 301 and the inner box 302.
- a vacuum heat insulating material 320 is also disposed inside the door 303. At least a part of the vacuum heat insulating material 320 shown in FIG. 9 is formed by the vacuum heat insulating material of the first embodiment.
- Some conventional refrigerators use rigid foamed urethane as a heat insulating material.
- a heat insulating material is filled by injecting a foamed urethane material into a space formed by an inner box and an outer box and foaming it by a chemical reaction.
- the heat insulating material By replacing at least a part of the portion where the hard foamed urethane was used as the heat insulating material with the vacuum heat insulating material of the first embodiment having a good heat insulating performance, the heat insulating material The thickness can be reduced. If the thickness of the heat insulating material can be reduced, the internal volume can be increased without increasing the size of the refrigerator. In addition, energy saving can be achieved. Furthermore, since the amount of hard foam urethane used can be reduced, recycling at the time of disposal of the refrigerator becomes easy.
- the arrangement position of the vacuum heat insulating material 320 shown in FIG. 9 is an example.
- the vacuum heat insulating material 320 may be disposed at other positions.
- the refrigerator 3 includes the outer box 301, the inner box 302 disposed inside the outer box 301, and the vacuum heat insulating material disposed between the outer box 301 and the inner box 302. 320, the vacuum heat insulating material 320 includes the vacuum heat insulating material of the first embodiment.
- the food stored in the inner box 302 is cooled. Therefore, in the refrigerator 3, it is necessary to keep the temperature inside the inner box 302 at a lower temperature than the outside of the outer box 301 or to efficiently cool the inside of the inner box 302. Therefore, the vacuum heat insulating material 320 is disposed between the outer box 301 and the inner box 302. If the heat insulation performance of the vacuum heat insulating material 320 disposed between the outer box 301 and the inner box 302 is excellent, it is necessary to make the inside of the inner box 302 cooler or hotter than the outside of the outer box 301. Energy can be reduced, thus saving energy.
- the refrigerator 3 having excellent heat insulating performance and energy saving can be provided.
- FIG. 10 is a side sectional view showing the entire water heater as a third embodiment of the present invention.
- a vacuum heat insulating material 430 is disposed inside the lid 410 of the hot water heater (pot) 4 and between the hot water storage container 422 and the outer container 421.
- the vacuum heat insulating material 430 is the vacuum heat insulating material of the first embodiment.
- the member forming the upper surface 411 of the lid 410 and the outer container 421 are examples of an outer box, and the member forming the lower surface 412 of the lid 410 and the hot water storage container 422 are an example of an inner box.
- positioning position of the vacuum heat insulating material 430 is an example, and the vacuum heat insulating material 430 may be arrange
- water is stored in the hot water storage container 422, and this water is heated by the resistance heating heater 440 or the like. Further, the water stored in the hot water storage container 422 can be kept warm.
- the thickness of the heat insulating material can be made thinner than before.
- the internal volume of the water heater 4 can be increased while saving space.
- energy saving can be achieved while improving the heat retaining performance of the water heater 4.
- the heat insulating material can be recycled more easily than in the case where urethane foam is used as the heat insulating material.
- FIG. 11 is a front perspective view (A) which shows the whole rice cooker as a 4th embodiment of this invention, a back perspective view (B), and a figure (C) which shows a member stored inside a rice cooker. It is.
- the rice cooker 5 is comprised from the housing
- FIG. 11C Inside the housing 501, as shown in FIG. 11C, there are an inner hook 504, a heater 505 disposed at the bottom of the inner hook 504, an inner hook 504 and an outer hook 503 that covers the heater 505. Be placed.
- a vacuum heat insulating material 510 is disposed inside the upper lid 502 of the rice cooker 5 and between the outer pot 503 and the housing 501.
- the vacuum heat insulating material 510 is disposed so as to be wound around the outer peripheral surface of the outer hook 503 so as to cover the outer peripheral face of the outer hook 503.
- the vacuum heat insulating material 510 is the vacuum heat insulating material of the first embodiment.
- the housing 501 is an example of an outer box, and the outer pot 503 is an example of an inner box.
- the upper surface of the upper lid 502 is an example of an outer box, and the lower surface of the upper lid 502 is an example of an inner box.
- positioning position of the vacuum heat insulating material 510 is an example, and the vacuum heat insulating material 510 may be arrange
- the thickness of the heat insulating material can be reduced more than the conventional one while obtaining the same heat insulating performance as the conventional heat insulating material. Can be thinned. In this way, space saving and energy saving can be achieved, and a large-capacity rice cooker 5 can be obtained.
- the vacuum heat insulating material 510 on the outer periphery of the outer hook 503, the temperature of the inner hook 504 is distributed isothermally along the height direction from the bottom where the heater 505 is arranged.
- the convection can be generated evenly in
- FIG. 12 is a perspective view showing the entirety of a washing / drying machine as a fifth embodiment of the present invention.
- the washing and drying machine 6 includes an exterior 601, a lid 602 for opening and closing an opening of the exterior 601, a washing / drying tank storage 603 accommodated in the exterior 601, and a washing / drying tank.
- a washing / drying tank (not shown) housed in the housing portion 603;
- a vacuum heat insulating material 610 is disposed between the exterior 601 and the washing / drying tank storage 603.
- the vacuum heat insulating material 610 is the vacuum heat insulating material of the first embodiment.
- the washing / drying machine 6 is a washing machine with a drying function.
- the arrangement position of the vacuum heat insulating material 610 is an example, and the vacuum heat insulating material 610 may be arranged at another position.
- the washing / drying tank is supported inside the washing / drying tank storage 603 so as to be rotatable.
- the user puts an object such as clothes in the washing / drying tank and operates the operation unit arranged on the lid 602 to wash or dry the object.
- an object such as clothes
- water is stored in the washing / drying tank, detergent is added, and the object is washed by rotating the washing / drying tank.
- the object is dried by circulating and supplying warm air to the inside of the washing and drying tank.
- the temperature of the hot air circulated in the washing / drying tank can be made difficult to decrease, and thus the drying can be performed efficiently.
- the vacuum heat insulating material of the present invention As one of the effects of the vacuum heat insulating material of the present invention, there is an effect that an excellent heat insulating performance can be obtained.
- the heat conductivity of the vacuum heat insulating material produced by changing the types of the outer packaging material, the core material, and the adsorbent was measured, and the heat insulating performance was compared.
- the core material and the adsorbing material were accommodated in the gas barrier outer packaging material formed in a bag shape, similarly to the vacuum heat insulating material of the first embodiment.
- the core material and the adsorbent were filled inside.
- the heat-welded portion of the outer packaging material filled with the core material and the adsorbent material was heat-welded under reduced pressure in a vacuum chamber.
- the heat welded portion was heat welded at a temperature of 170 to 220 ° C. when the Pirani gauge reading value set in the vacuum chamber reached 0.009 Torr.
- a gas barrier film using nylon as the outermost layer, using two layers of aluminum-deposited PET resin and aluminum foil as the intermediate layer, and using polyethylene resin as the innermost layer was used.
- LLDPE or HDPE was used as the innermost layer of the outer packaging material.
- the core material is configured by laminating a plurality of non-woven fabrics.
- a wet papermaking core material or a glass wool core material was used as the core material.
- each of the wet papermaking core material and the glass wool core material was produced as follows.
- each nonwoven fabric is produced by a papermaking method using glass fibers which are examples of inorganic fibers and a small amount of an organic binder.
- Glass chopped strands (manufactured by Owens Corning Corporation) having an average fiber diameter of 10 ⁇ m and an average fiber length of 10 mm were poured into water so that the concentration became 0.5% by mass, and Emanon ( (Registered trademark) 3199 (manufactured by Kao Corporation) was added to 1 part by mass with respect to 100 parts by mass of the glass chopped strands, and stirred to prepare a glass chopped strand slurry.
- paper was made by a wet paper making method to prepare a web.
- the obtained web was impregnated with a liquid obtained by diluting an acrylic emulsion (GM-4 manufactured by Dainippon Ink & Chemicals, Inc.) with water so that its solid content concentration was 3.0% by mass, and the moisture content of the web was adjusted by sucking moisture so as to be 0.7% by mass with respect to the glass fiber mass.
- the nonwoven fabric used for a wet papermaking core material was produced by drying a web.
- the nonwoven fabric used for the obtained wet papermaking core material had a basis weight of 100 g / m 2 .
- a plurality of non-woven fabrics were laminated to form a wet papermaking core material.
- the size of the wet papermaking core the long side was 435 mm, the short side was 400 mm, and the thickness was 9 mm.
- Glass wool having an average fiber diameter of 3.5 ⁇ m was laminated as an aggregate of glass fibers and formed into a predetermined density by hot pressing to prepare a core material in a board shape.
- the glass wool core material had a long side of 435 mm, a short side of 400 mm, and a thickness of 8 mm.
- FIG. 13 is a plan view schematically showing a distribution state of glass fibers in glass wool that has been conventionally used as a core material of a vacuum heat insulating material.
- FIG. 14 is a planar electron micrograph (magnification 100 times) showing the distribution state before compression of glass fibers in glass wool, which has been conventionally used as a core material for vacuum heat insulating materials, and
- FIG. 15 shows the same distribution state. It is an electron micrograph (magnification 100 times) of a section.
- the glass wool 800 As shown in FIG. 13, in the glass wool 800, it can be seen that a large number of glass fibers 810 having various fiber lengths extend in various directions and are randomly distributed. Further, as shown in FIGS. 14 and 15, in glass wool manufactured by a flame method or a centrifugal method, a short fiber having a fiber length of 1 mm or less or a fine fiber having a fiber diameter of 1 ⁇ m or less with respect to the main fiber. It is in a state in which various fibers are mixed. Such short fibers and fine fibers are filled between the main fibers or entangled between the main fibers, and heat conduction occurs between the fibers, along the thickness direction of the core material. It is considered that the heat insulation performance is lowered by causing heat conduction. Moreover, in such glass wool, it turns out that the main fiber also includes many fibers that are bent or twisted.
- the following three types were used alone or in combination.
- Calcium oxide (CaO), 10g (2) As hydrocarbon gas adsorbent A, Purafile Select (manufactured by JMS Co., Ltd.), 2.5 g, containing alumina and potassium permanganate as main components (3) As hydrocarbon gas adsorbent B, SAES Getter (SG-CONBO3 manufactured by Saes getters), 10 g.
- the hydrocarbon gas adsorbent B contains calcium oxide (50 to 100%), cobalt oxide (10 to 25%), barium (2.5% or less), and lithium (2.5% or less).
- the potassium permanganate of the hydrocarbon gas adsorbent A adsorbs ethylene, which is a hydrocarbon gas.
- the cobalt oxide of the hydrocarbon gas adsorbent B adsorbs the hydrocarbon gas.
- calcium oxide does not adsorb hydrocarbon gas but adsorbs water.
- the above outer packaging material, core material, and adsorbent were combined as shown in the following (1) to (8) to prepare 8 types of vacuum heat insulating materials.
- the outer packaging material in which the innermost layer was formed of LLDPE was used.
- a wet papermaking core was used as the core.
- Calcium oxide (CaO) was used as the adsorbent.
- An outer packaging material in which the innermost layer was formed of HDPE was used.
- a wet papermaking core was used as the core.
- Calcium oxide (CaO) was used as the adsorbent.
- the outer packaging material in which the innermost layer was formed of HDPE was used.
- a wet papermaking core was used as the core.
- As the adsorbent calcium oxide (CaO) and hydrocarbon gas adsorbent A were used.
- An outer packaging material in which the innermost layer was formed of HDPE was used.
- a core material a glass wool core material was used.
- Calcium oxide (CaO) was used as the adsorbent.
- An outer packaging material in which the innermost layer was formed of HDPE was used.
- a core material a glass wool core material was used.
- adsorbent calcium oxide (CaO) and hydrocarbon gas adsorbent A were used.
- the thermal conductivity of eight types of vacuum heat insulating materials (1) to (8) was measured.
- the thermal conductivity was measured using a thermal conductivity measuring device (HC-074 / 600 manufactured by Eihiro Seiki Co., Ltd.).
- the average temperature of the vacuum heat insulating material at the time of measurement was 24 ° C.
- Table 1 shows the obtained thermal conductivity.
- the outermost layer is formed of LLDPE and the core material is a vacuum heat insulating material (1) to (3) using a wet papermaking core, it is oxidized as an adsorbent.
- the thermal conductivity of (2) using calcium oxide and hydrocarbon gas adsorbent A and (3) using hydrocarbon gas adsorbent B is lower. It was.
- calcium oxide (CaO) is used as the adsorbent.
- the thermal conductivity of (5) using calcium oxide and hydrocarbon gas adsorbent A and (6) using hydrocarbon gas adsorbent B were lower than (4) used.
- the outermost layer is made of HDPE and the core material is a vacuum heat insulating material (7) and (8) using a glass wool core material
- calcium oxide (CaO) is used as the adsorbent.
- the thermal conductivity of (8) using calcium oxide and hydrocarbon gas adsorbent A was lower.
- the vacuum heat insulating materials (2), (3), (5), (6), and (8) including the hydrocarbon gas adsorbent A and the hydrocarbon gas adsorbent B adsorb hydrocarbon gas. It can be seen that it has a lower thermal conductivity than the vacuum heat insulating materials (1), (4), and (7) that do not include the adsorbing material, and has excellent heat insulating performance exceeding the improvement limit of the conventional heat insulating performance.
- the vacuum heat insulating material according to the present invention it is possible to provide a device such as a refrigerator excellent in heat insulating performance and energy saving.
- the vacuum heat insulating material according to the present invention is used to heat, cool, and keep various foods, such as a refrigerator, a cold box, a warm box, etc. It is applied to the inside of the outer wall of the building, etc. for the purpose of improving the heat insulation performance of the building or the building for drying the object.
- Vacuum heat insulating material 100: core material, 110: non-woven fabric, 200: outer packaging material, 230: innermost layer, 300: heat welding part, 400: adsorbent, 3: refrigerator, 301: outer box, 302: inner box, 320: Vacuum heat insulating material, 4: Water heater, 411: Upper surface, 412: Lower surface, 421: Outer container, 422: Hot water storage container, 430: Vacuum heat insulating material, 5: Rice cooker, 501: Housing, 503: Outer pot, 510: Vacuum heat insulating material, 6: Washing / drying machine, 601: Exterior, 603: Washing / drying tank storage, 610: Vacuum heat insulating material.
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Abstract
Description
外包材の内部の炭化水素ガスの量が増えることによって真空断熱材の断熱性能が低下することを検証するために、外包材の熱溶着を複数回行ったときの真空断熱材の断熱性能の変化を測定した。 (Verification experiment 1)
In order to verify that the heat insulation performance of the vacuum insulation material decreases due to the increase in the amount of hydrocarbon gas inside the outer packaging material, the change in the heat insulation performance of the vacuum insulation material when the outer packaging material is thermally welded multiple times Was measured.
熱溶着部の熱溶着時に発生する炭化水素ガスによって真空断熱材の断熱性能が低下することをさらに検証するために、外包材の熱溶着の長さを変化させたときの真空断熱材の断熱性能の変化を測定した。 (Verification experiment 2)
In order to further verify that the heat insulation performance of the vacuum heat insulating material is reduced by the hydrocarbon gas generated during the heat welding of the heat welded part, the heat insulation performance of the vacuum heat insulating material when the length of the heat welding of the outer packaging material is changed The change of was measured.
図4は、この発明の第1実施の形態として、真空断熱材の構成を模式的に示す断面図である。図4の(A)は、外包材の内部を減圧する前の状態、図4の(B)は、外包材の内部が減圧されている場合の状態を示す図である。 (First embodiment)
FIG. 4 is a cross-sectional view schematically showing the configuration of the vacuum heat insulating material as the first embodiment of the present invention. 4A shows a state before the inside of the outer packaging material is decompressed, and FIG. 4B shows a state when the inside of the outer packaging material is decompressed.
図9は、この発明の第2実施形態として、冷蔵庫の全体を示す側断面図(A)と、冷蔵庫の外装を示す正面図(B)である。 (Second Embodiment)
FIG. 9 is a side sectional view (A) showing the entire refrigerator and a front view (B) showing the exterior of the refrigerator as a second embodiment of the present invention.
図10は、この発明の第3実施形態として、給湯器の全体を示す側断面図である。 (Third embodiment)
FIG. 10 is a side sectional view showing the entire water heater as a third embodiment of the present invention.
図11は、この発明の第4実施形態として、炊飯器の全体を示す正面斜視図(A)と、背面斜視図(B)と、炊飯器の内部に収容される部材を示す図(C)である。 (Fourth embodiment)
FIG. 11: is a front perspective view (A) which shows the whole rice cooker as a 4th embodiment of this invention, a back perspective view (B), and a figure (C) which shows a member stored inside a rice cooker. It is.
図12は、この発明の第5実施形態として、洗濯乾燥機の全体を示す斜視図である。 (Fifth embodiment)
FIG. 12 is a perspective view showing the entirety of a washing / drying machine as a fifth embodiment of the present invention.
湿式抄紙芯材においては、それぞれの不織布は、無機繊維の一例であるガラス繊維と、少量の有機バインダーを用いて、抄紙法によって作製されている。 (1) Wet papermaking core material In a wet papermaking core material, each nonwoven fabric is produced by a papermaking method using glass fibers which are examples of inorganic fibers and a small amount of an organic binder.
ガラス繊維の集合体として平均繊維径3.5μmのグラスウールを積層し、熱プレスすることによって所定の密度に成形を行い、ボード状にして芯材を作製した。グラスウール芯材の大きさは、長辺が435mm、短辺が400mm、厚みが8mmであった。 (2) Glass Wool Core Material Glass wool having an average fiber diameter of 3.5 μm was laminated as an aggregate of glass fibers and formed into a predetermined density by hot pressing to prepare a core material in a board shape. The glass wool core material had a long side of 435 mm, a short side of 400 mm, and a thickness of 8 mm.
(2)炭化水素ガス吸着材Aとして、アルミナと過マンガン酸カリウムを主要成分とするPurafil Select(株式会社ジェイエムエス製)、2.5g
(3)炭化水素ガス吸着材Bとして、サエスゲッター(Saes getters社製 SG-CONBO3)、10g。炭化水素ガス吸着材Bは、酸化カルシウム(50~100%)、酸化コバルト(10~25%)、バリウム(2.5%以下)、リチウム(2.5%以下)を含む。 (1) Calcium oxide (CaO), 10g
(2) As hydrocarbon gas adsorbent A, Purafile Select (manufactured by JMS Co., Ltd.), 2.5 g, containing alumina and potassium permanganate as main components
(3) As hydrocarbon gas adsorbent B, SAES Getter (SG-CONBO3 manufactured by Saes getters), 10 g. The hydrocarbon gas adsorbent B contains calcium oxide (50 to 100%), cobalt oxide (10 to 25%), barium (2.5% or less), and lithium (2.5% or less).
Claims (5)
- 外包材(200)と、
前記外包材(200)の内部に収容される芯材(100)と、
前記外包材(200)の内部に収容される吸着材(400)とを備え、
前記外包材(200)は、外包材(200)同士が互いに接触して熱溶着される熱溶着部(300)を有し、
前記熱溶着部(300)は炭化水素を含む材質によって形成され、
前記吸着材(400)は炭化水素ガスを吸着する吸着材(400)である、真空断熱材(1)。 Outer packaging (200);
A core material (100) housed inside the outer packaging material (200);
An adsorbent (400) housed inside the outer packaging material (200),
The outer packaging material (200) has a heat welding part (300) in which the outer packaging materials (200) come into contact with each other and are heat-welded.
The thermal welding part (300) is formed of a material containing hydrocarbons,
The said adsorbent (400) is a vacuum heat insulating material (1) which is an adsorbent (400) which adsorbs hydrocarbon gas. - 前記芯材(100)は複数の不織布(110)を積層することにより構成され、
前記不織布(110)は、連続フィラメント法によって製造された複数の無機繊維を少なくとも含み、前記不織布(110)においては、前記複数の無機繊維のうち大半の無機繊維が前記不織布(110)の表面とほぼ平行な方向に延在している、請求項1に記載の真空断熱材(1)。 The core material (100) is constituted by laminating a plurality of nonwoven fabrics (110),
The non-woven fabric (110) includes at least a plurality of inorganic fibers manufactured by a continuous filament method, and in the non-woven fabric (110), most of the inorganic fibers are a surface of the non-woven fabric (110). The vacuum heat insulating material (1) according to claim 1, wherein the vacuum heat insulating material (1) extends in a substantially parallel direction. - 前記無機繊維の平均繊維径が3μm以上15μm以下、前記無機繊維の平均繊維長が3mm以上15mm以下である、請求項2に記載の真空断熱材(1)。 The vacuum heat insulating material (1) according to claim 2, wherein an average fiber diameter of the inorganic fibers is 3 µm or more and 15 µm or less, and an average fiber length of the inorganic fibers is 3 mm or more and 15 mm or less.
- 前記無機繊維はガラス繊維である、請求項2に記載の真空断熱材(1)。 The vacuum heat insulating material (1) according to claim 2, wherein the inorganic fiber is a glass fiber.
- 外箱(301,411,421,501,601)と、
前記外箱(301,411,421,501,601)の内側に配置される内箱(302,412,422,503,603)と、
前記外箱(301,411,421,501,601)と前記内箱(302,412,422,503,603)との間に配置される真空断熱材(1,430,510,610)とを備え、
前記真空断熱材(1,430,510,610)は、請求項1に記載の真空断熱材(1,430,510,610)を含む、機器(3,4,5,6)。
An outer box (301, 411, 421, 501, 601);
An inner box (302, 412, 422, 503, 603) disposed inside the outer box (301, 411, 421, 501, 601);
Vacuum heat insulating materials (1, 430, 510, 610) disposed between the outer box (301, 411, 421, 501, 601) and the inner box (302, 412, 422, 503, 603). Prepared,
Apparatus (3, 4, 5, 6), wherein said vacuum insulation (1, 430, 510, 610) comprises the vacuum insulation (1, 430, 510, 610) of claim 1.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201080015047.5A CN102388252B (en) | 2009-04-07 | 2010-04-06 | Vacuum insulation material and device provided with same |
DE112010001539T DE112010001539T5 (en) | 2009-04-07 | 2010-04-06 | VACUUM HEAT INSULATION MATERIAL AND DEVICE WITH THE SAME |
Applications Claiming Priority (2)
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JP2009092734A JP4717126B2 (en) | 2009-04-07 | 2009-04-07 | Vacuum insulation and equipment equipped with it |
JP2009-092734 | 2009-04-07 |
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WO2010116720A1 true WO2010116720A1 (en) | 2010-10-14 |
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PCT/JP2010/002504 WO2010116720A1 (en) | 2009-04-07 | 2010-04-06 | Vacuum insulation material and device provided with same |
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JP (1) | JP4717126B2 (en) |
CN (1) | CN102388252B (en) |
DE (1) | DE112010001539T5 (en) |
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JP6025969B2 (en) * | 2013-04-05 | 2016-11-16 | 三菱電機株式会社 | Vacuum heat insulating material, heat insulation tank equipped with the same, heat insulation body, and heat pump water heater |
CN105179882A (en) * | 2015-08-07 | 2015-12-23 | 安徽百特新材料科技有限公司 | Efficient inorganic nanometer micropore vacuum panel |
JP6498097B2 (en) * | 2015-10-21 | 2019-04-10 | 三菱電機株式会社 | Vacuum heat insulating material, method for manufacturing vacuum heat insulating material, and heat insulation container |
JP2018017316A (en) * | 2016-07-28 | 2018-02-01 | 日立アプライアンス株式会社 | Vacuum heat insulation material and refrigerator using the same |
JP2020122631A (en) * | 2019-01-31 | 2020-08-13 | 東芝ライフスタイル株式会社 | Refrigerator and vacuum heat insulation panel |
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- 2010-04-06 DE DE112010001539T patent/DE112010001539T5/en not_active Withdrawn
- 2010-04-06 WO PCT/JP2010/002504 patent/WO2010116720A1/en active Application Filing
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DE112010001539T5 (en) | 2012-06-14 |
JP4717126B2 (en) | 2011-07-06 |
CN102388252B (en) | 2015-07-22 |
CN102388252A (en) | 2012-03-21 |
JP2010242867A (en) | 2010-10-28 |
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