WO2020152854A1 - Vacuum heat insulation material and heat insulation box - Google Patents

Vacuum heat insulation material and heat insulation box Download PDF

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Publication number
WO2020152854A1
WO2020152854A1 PCT/JP2019/002496 JP2019002496W WO2020152854A1 WO 2020152854 A1 WO2020152854 A1 WO 2020152854A1 JP 2019002496 W JP2019002496 W JP 2019002496W WO 2020152854 A1 WO2020152854 A1 WO 2020152854A1
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WO
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Prior art keywords
heat insulating
core material
vacuum heat
insulating material
core
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PCT/JP2019/002496
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French (fr)
Japanese (ja)
Inventor
一正 藤村
貴祥 向山
夕貴 大森
浩明 高井
努 小高
福田　真一
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三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2019/002496 priority Critical patent/WO2020152854A1/en
Priority to JP2020567336A priority patent/JP7154316B2/en
Publication of WO2020152854A1 publication Critical patent/WO2020152854A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/06—Arrangements using an air layer or vacuum
    • F16L59/065—Arrangements using an air layer or vacuum using vacuum

Definitions

  • the present invention relates to a vacuum heat insulating material using glass fiber as a core material, and a heat insulating box equipped with the vacuum heat insulating material.
  • Vacuum insulation is known as the insulation used in insulation boxes such as refrigerators.
  • the vacuum heat insulating material includes a core material and an outer packaging material that wraps the core material, and the internal space covered with the outer packaging material is in a reduced pressure state.
  • a core material is formed of glass short fibers (see, for example, Patent Document 1).
  • Short glass fibers are formed by a centrifugal method in which molten glass is blown off by a centrifugal force with a high-speed rotating spinner to form glass into fibers.
  • the short glass fibers are formed by a flame method in which glass is made into fibers by blowing away the tip of a glass rod while melting it with a flame. Short glass fibers are also called glass wool.
  • a conventional vacuum heat insulating material one using glass chopped strand as a core material is known (for example, refer to Patent Document 2).
  • the glass chopped strand is formed by cutting the glass strand into a specified length.
  • the glass strand is a plurality of glass fibers drawn from a spinning nozzle by a continuous filament method and directly aligned and bundled.
  • a nonwoven fabric in which glass chopped strands are made into monofilaments is formed by a wet papermaking method, and a plurality of the nonwoven fabrics are laminated to form a core material. ing.
  • the heat insulating performance of the vacuum heat insulating material can be improved as compared with the case of using the core material formed of short glass fibers.
  • the through holes formed in the outer packaging material by the shot lead to a vacuum leak defect, and the heat insulating performance of the vacuum heat insulating material deteriorates. There was a problem of being lost.
  • the conventional vacuum heat insulating material using glass chopped strands as the core material does not include shots in the core material. For this reason, the conventional vacuum heat insulating material using glass chopped strands as the core material rarely causes vacuum leakage failure due to the through holes formed in the outer packaging material.
  • the conventional vacuum heat insulating material using glass chopped strands as the core material has lower rigidity than the conventional vacuum heat insulating material using the core material formed of short glass fibers. For this reason, the conventional vacuum heat insulating material using glass chopped strands as the core material is easily bent at the time of manufacture and is easily bent even after the manufacture.
  • the conventional vacuum heat insulating material using glass chopped strands as the core material has a problem that it is difficult to handle as compared with the conventional vacuum heat insulating material using the core material formed of short glass fibers.
  • the conventional vacuum heat insulating material using glass chopped strands as the core material is about 1.2 times to about 1.6 times more than the conventional vacuum heat insulating material using the core material formed of glass short fibers. The weight becomes heavy. Also in this respect, the conventional vacuum heat insulating material using glass chopped strands as the core material is more difficult to handle than the conventional vacuum heat insulating material using the core material formed of short glass fibers.
  • the low-molecular component contained in the binder is volatilized inside the vacuum heat insulating material, so that the vacuum degree inside the vacuum heat insulating material is lowered and the heat insulating performance is lowered. .. That is, when the glass fibers are bonded to each other by the binder, the heat insulating performance of the vacuum heat insulating material is improved as compared with the case of using the core material formed of short glass fibers, that is, the conventional glass chopped strand as the core material is used. The effect that the vacuum heat insulating material has is reduced.
  • the present invention has been made in view of the above-mentioned problems, and a vacuum heat insulating material that can suppress vacuum leakage failure due to a through hole formed in an outer packaging material and can be easily handled without using a binder is provided.
  • the first purpose is to obtain.
  • a second object of the present invention is to obtain a heat insulating box provided with such a vacuum heat insulating material.
  • the vacuum heat insulating material according to the present invention is a plate-shaped vacuum heat insulating material having a core material and an outer packaging material that wraps the core material, and the internal space covered with the outer packaging material is in a reduced pressure state
  • the core material includes a first core material that is a needle mat of glass chopped strands and a second core material formed of short glass fibers, and the first core material and the second core material are vacuum-insulated. At least one of the two surfaces of the core material that is laminated in the thickness direction of the material and is in contact with the outer packaging material facing the outer packaging material in the thickness direction is composed of the first core material. ing.
  • the heat insulating box according to the present invention includes an outer box, an inner box arranged inside the outer box, and a vacuum heat insulating material according to the present invention.
  • the vacuum heat insulating material according to the present invention In the vacuum heat insulating material according to the present invention, at least one of the two surfaces of the outer packaging material and the core material facing in the thickness direction of the vacuum heat insulating material and in contact with the outer packaging material is a needle mat of glass chopped strands. It is a single core material. Therefore, the vacuum heat insulating material according to the present invention can suppress the vacuum leakage failure due to the through hole formed in the outer packaging material, as compared with the conventional vacuum heat insulating material using the core material formed of short glass fibers. ..
  • the core material of the vacuum heat insulating material according to the present invention is configured by laminating the first core material, which is a needle mat of glass chopped strands, and the second core material formed of glass short fibers. Therefore, the vacuum heat insulating material according to the present invention has improved rigidity and lighter mass as compared with the conventional vacuum heat insulating material using glass chopped strands as the core material. Further, the core material of the vacuum heat insulating material according to the present invention can be manufactured without using a binder. Therefore, the vacuum heat insulating material according to the present invention is easier to handle than a conventional vacuum heat insulating material using glass chopped strands as a core material without using a binder.
  • FIG. 1 is a sectional view showing a schematic configuration of a vacuum heat insulating material according to the first embodiment of the present invention.
  • the vacuum heat insulating material 1 is a heat insulating material that realizes low thermal conductivity by maintaining a vacuum inside.
  • the vacuum heat insulating material 1 includes a core material 20 and an outer packaging material 3 that wraps the core material 20.
  • the vacuum space defined by the outer wrapping material 3 is formed by heat-sealing the opening portion by heat sealing or the like in a state where the inside of the bag-shaped outer wrapping material 3 having an opening is depressurized. To be done. That is, the internal space covered with the outer packaging material 3 is in a reduced pressure state.
  • the vacuum heat insulating material 1 is formed in a generally rectangular plate shape as a whole when observed in the thickness direction of the vacuum heat insulating material 1, in other words, when observed in the vertical direction of the paper surface of FIG.
  • the vacuum heat insulating material 1 also includes an adsorbent 4 that adsorbs at least water in the internal space covered with the outer packaging material 3. That is, in the vacuum heat insulating material 1 according to the first embodiment, the core material 20 and the adsorbent 4 are wrapped with the outer packaging material 3.
  • the core material 20 is used for the purpose of maintaining a vacuum space.
  • the core material 20 according to the first embodiment includes a first core material 21 that is a needle mat of glass chopped strand and a second core material 22 formed of glass short fibers (glasswool). I have it.
  • the core material 20 has a structure in which the first core material 21 and the second core material 22 are laminated in the thickness direction of the vacuum heat insulating material 1.
  • the glass chopped strand needle mat that is the first core material 21 is formed by stacking glass chopped strands of a specified length in a uniform thickness in a non-directional manner and then stitching them together to form a mat.
  • the glass chopped strand is formed by cutting the glass strand into a specified length.
  • the glass strand is a plurality of glass fibers drawn from a spinning nozzle by a continuous filament method and directly aligned and bundled.
  • the 1st core material 21 comprised in this way can be manufactured without containing a binder.
  • the needle mat uses glass chopped strands having a length of about 50 mm. However, this length of glass chopped strands is an example, and glass chopped strands of various lengths can form the needle mat.
  • the needle mat is formed of about 100 mm of glass chopped strands.
  • the glass chopped strand needle mat that is the first core member 21 the glass chopped strand extends substantially perpendicular to the heat insulating direction that is the thickness direction of the vacuum heat insulating material 1. Further, glass chopped strands are laminated in the heat insulating direction which is the thickness direction of the vacuum heat insulating material 1. Therefore, the vacuum heat insulating material 1 using the first core material 21 which is the needle mat of glass chopped strands has improved heat insulating performance as compared with the conventional vacuum heat insulating material using the core material formed of glass short fibers. .. Further, the first core member 21 has glass chopped strands intertwined with each other by needle punching. Therefore, when manufacturing the first core material 21, it is not necessary to use a binder such as an organic binder.
  • the first core material 21 can prevent heat transfer from the bonding portion where the glass fibers are bonded to each other by the bonding agent.
  • the first core material 21 can also prevent deterioration of the heat insulating performance of the vacuum heat insulating material 1 due to volatilization of low molecular components contained in the binder.
  • the glass short fibers forming the second core material 22 are formed by a centrifugal method in which the molten glass is spun by a high-speed rotating spinner by centrifugal force to form the glass into fibers.
  • the short glass fibers forming the second core member 22 may be formed by a flame method in which the tip of a glass rod is melted by a flame and blown away while the glass is made into fibers. Short glass fibers are also called glass wool.
  • the conventional vacuum heat insulating material that uses glass chopped strands as the core material has lower rigidity than the conventional vacuum heat insulating material that uses the core material formed of short glass fibers. For this reason, the conventional vacuum heat insulating material using glass chopped strands as the core material is easily bent at the time of manufacture and is easily bent even after the manufacture. Therefore, the conventional vacuum heat insulating material using glass chopped strands as the core material is more difficult to handle than the conventional vacuum heat insulating material using the core material formed of short glass fibers.
  • the conventional vacuum heat insulating material using glass chopped strands as the core material is about 1.2 times to about 1.6 times more than the conventional vacuum heat insulating material using the core material formed of glass short fibers. The weight becomes heavy.
  • the conventional vacuum heat insulating material using glass chopped strands as the core material is more difficult to handle than the conventional vacuum heat insulating material using the core material formed of short glass fibers.
  • the core material 20 has a configuration in which the first core material 21 and the second core material 22 are laminated in the thickness direction of the vacuum heat insulating material 1. Therefore, the vacuum heat insulating material 1 according to the first embodiment has improved rigidity and lighter mass than the conventional core material using glass chopped strands. Therefore, the vacuum heat insulating material 1 according to the first embodiment is easier to handle than the conventional core material using glass chopped strands.
  • first surface 23 one of the two surfaces of the core material 20 facing the outer packaging material 3 and the vacuum heat insulating material 1 in the thickness direction and in contact with the outer packaging material 3
  • second surface 24 the other of the two surfaces of the core material 20 that faces the outer packaging material 3 and the vacuum heat insulating material 1 in the thickness direction and is in contact with the outer packaging material 3
  • first surface 23 and the second surface 24 are defined in this way, as shown in FIG. 1, the first surface 23 of the core member 20 is composed of the first core member 21 which is a needle mat of glass chopped strands. ing. That is, in the range where the outer packaging material 3 and the first surface 23 of the core material 20 are in contact with each other, the outer packaging material 3 and the needle mat of the glass chopped strands are in contact with each other.
  • the second surface 24 of the core material 20 may be composed of the first core material 21, which is a needle mat of glass chopped strands.
  • the outer packaging material 3 and the needle mat of the glass chopped strands come into contact with each other in a range where the outer packaging material 3 and the second surface 24 of the core material 20 are in contact with each other.
  • FIG. 2 is a sectional view showing a schematic configuration of another example of the vacuum heat insulating material according to the first embodiment of the present invention.
  • the core material 20 may be composed of a first core material 21 that is a needle mat of glass chopped strands on both sides of the first surface 23 and the second surface 24. That is, in the core material 20 according to the first embodiment, at least one of the first surface 23 and the second surface 24 may be composed of the first core material 21.
  • the through holes formed in the outer packaging material by the shot lead to a vacuum leak defect, and the heat insulating performance of the vacuum heat insulating material deteriorates. There was a case that it ended up.
  • shots do not occur in the manufacturing process. Therefore, by configuring the core material 20 as in the present first embodiment, the outer packaging material 3 is shot by the shot in the range in which the outer packaging material 3 and the first core material 21, which is the needle mat of the glass chopped strand, are in contact with each other. It is possible to prevent the through hole from being formed. Therefore, the vacuum heat insulating material 1 according to the first embodiment causes a vacuum leak defect due to the through hole formed in the outer packaging material, as compared with the conventional vacuum heat insulating material using the core material formed of short glass fibers. Can be suppressed.
  • the outer packaging material 3 has a gas barrier property.
  • the outer packaging material 3 is a laminated film having a multilayer structure.
  • the outer wrapping material 3 is a polyethylene layer, an ethylene-vinyl alcohol layer vapor-deposited with aluminum, and a polyethylene terephthalate layer vapor-deposited with aluminum in this order from the inner side to the outer side which is the core material 20 side. , And a nylon layer are laminated.
  • the configuration of the outer packaging material 3 is merely an example. As long as it has gas barrier properties, various outer packaging materials used for existing vacuum heat insulating materials can be used as the outer packaging material 3.
  • the outer packaging material 3 may be provided with a layer vapor-deposited with alumina, or may be provided with a layer vapor-deposited with silica.
  • the adsorbent 4 is used for the purpose of adsorbing gas and water vapor inside the vacuum heat insulating material 1 and maintaining the degree of vacuum to suppress an increase in thermal conductivity, that is, a decrease in heat insulating performance.
  • the adsorbent 4 it is general to use calcium oxide (CaO).
  • the adsorbent 4 may be silica gel or zeolite.
  • the adsorbent 4 may be a combination of at least two of calcium oxide, silica gel and zeolite.
  • the manufacturing process of the vacuum heat insulating material 1 according to the first embodiment will be described.
  • the two outer packaging materials 3 are overlapped and the outer peripheral portions are fused together by heat sealing or the like except for a part.
  • the outer packaging material 3 has a bag shape in which a part of the outer peripheral portion is opened.
  • the first core material 21 and the second core material 22 are laminated to form the core material 20, and the core material 20 is inserted into the bag-shaped outer packaging material 3.
  • the laminated first core material 21 and second core material 22 may be covered with two outer packaging materials 3, and then the outer peripheral portions of the outer packaging material 3 may be fusion-bonded except for a part thereof.
  • an uneven shape may be formed using a press die on the heat insulating surface of the vacuum heat insulating material 1 after vacuum sealing.
  • the vacuum heat insulating material 1 according to the first embodiment was produced as Examples 1 to 9, and the density, the thermal conductivity and the bending elastic modulus of the core material were different between Comparative Example 1 and Comparative Example 2. A comparison was made. The comparison results are shown in Tables 1 and 2, and the comparison results are described below.
  • the vacuum heat insulating materials 1 according to Examples 1 to 9 as the first core material 21 of the core material 20, a needle mat of glass chopped strands having a cloth mass of 320 g/m 2 is used. The needle mat is cut so that the width of the core material 20 after the completion of the vacuum heat insulating material 1 becomes 0.5 m and the length of the core material 20 after the completion of the vacuum heat insulating material 1 becomes 2.0 m. It is used as the material 21. Further, in the vacuum heat insulating materials 1 according to Examples 1 to 9, short glass fibers having a cross mass of 1200 g/m 2 are used as the second core material 22 of the core material 20.
  • the short glass fiber is cut so that the width of the core material 20 after completion of the vacuum heat insulating material 1 becomes 0.5 m and the length of the core material 20 after completion of the vacuum heat insulating material 1 becomes 2.0 m. It is used as the core material 22.
  • the cloth mass mass (mass per unit area) is the weight per 1 m 2 of glass cloth.
  • a predetermined number of the first core material 21 and the second core material 22 are provided so that the thickness of the core material 20 after the vacuum heat insulating material 1 is completed is 50 mm.
  • the core material 20 is formed by overlapping.
  • the method of stacking the first core material 21 and the second core material 22 is not particularly limited as long as at least one of the first surface 23 and the second surface is composed of the first core material 21.
  • the vacuum heat insulating materials 1 according to Examples 1 to 9 are different in the number of the first core material 21 and the second core material 22.
  • the core material 20 of the vacuum heat insulating material 1 according to the first embodiment five first core materials 21 and nine second core materials 22 are laminated.
  • the total mass of the core material 20 is 12400 g.
  • the ratio of the mass of the first core material 21 to the mass of the whole core material 20 is 12.9 mass %.
  • the value obtained by dividing the mass of the first core material 21 by the mass of the entire core material 20 by 100 is 12.9.
  • the core material 20 of the vacuum heat insulating material 1 according to the second embodiment is formed by stacking 10 first core materials 21 and 8 second core materials 22.
  • the total mass of the core material 20 is 12,800 g.
  • the ratio of the mass of the first core material 21 to the mass of the whole core material 20 is 25.0 mass %.
  • the core material 20 of the vacuum heat insulating material 1 according to the third embodiment has 15 first core materials 21 and 7 second core materials 22 laminated.
  • the total mass of the core material 20 is 13200 g.
  • the ratio of the mass of the first core material 21 to the mass of the whole core material 20 is 36.4 mass %.
  • the core material 20 of the vacuum heat insulating material 1 according to the fourth embodiment has 20 first core materials 21 and 6 second core materials 22 laminated.
  • the total mass of the core material 20 is 13,600 g.
  • the ratio of the mass of the first core material 21 to the mass of the entire core material 20 is 47.1 mass %.
  • the core material 20 of the vacuum heat insulating material 1 according to the fifth embodiment has 25 first core materials 21 and 5 second core materials 22 laminated.
  • the total mass of the core material 20 is 14000 g.
  • the ratio of the mass of the first core material 21 to the mass of the entire core material 20 is 57.1 mass %.
  • the core material 20 of the vacuum heat insulating material 1 according to the sixth embodiment is formed by laminating 30 first core materials 21 and 4 second core materials 22.
  • the total mass of the core material 20 is 14400 g.
  • the ratio of the mass of the first core material 21 to the mass of the entire core material 20 is 66.7 mass %.
  • the core material 20 of the vacuum heat insulating material 1 according to the seventh embodiment is formed by stacking 35 first core materials 21 and three second core materials 22.
  • the total mass of the core material 20 is 14800 g.
  • the ratio of the mass of the first core material 21 to the mass of the entire core material 20 is 75.7 mass %.
  • the core material 20 of the vacuum heat insulating material 1 according to the eighth embodiment includes 40 first core materials 21 and two second core materials 22 that are stacked.
  • the total mass of the core material 20 is 15200 g.
  • the ratio of the mass of the first core material 21 to the mass of the entire core material 20 is 84.2 mass %.
  • the core material 20 of the vacuum heat insulating material 1 according to the ninth embodiment is formed by stacking 45 first core materials 21 and one second core material 22.
  • the total mass of the core material 20 is 15600 g.
  • the ratio of the mass of the first core material 21 to the mass of the entire core material 20 is 92.3% by mass.
  • the outer packaging material 3 a polyethylene layer, an ethylene-vinyl alcohol layer vapor-deposited with aluminum in this order from the inner side toward the outer side of the core material 20, A laminated film in which a polyethylene terephthalate layer vapor-deposited on aluminum and a nylon layer were laminated was used.
  • the core material 20 configured as described above is inserted into the outer packaging material 3 formed in the shape of a bag with a part opened, and heat treatment is performed at 100° C. for 2 hours to remove moisture from the outer packaging material 3 and the core material 20.
  • the adsorbent 4 composed of 50 g of calcium oxide was placed inside the outer packaging material 3 formed in a bag shape.
  • the inside of the outer wrapping material 3 was depressurized to a vacuum degree of 1 Pa, and in the depressurized state, the openings were fused by heat sealing to produce vacuum heat insulating materials 1 according to Examples 1 to 9.
  • the first core material 21 used in the vacuum heat insulating material 1 according to any of Examples 1 to 9 is formed so that the thickness of the core material after completion of the vacuum heat insulating material is 50 mm.
  • the core material is formed by stacking only these. That is, in the vacuum heat insulating material according to Comparative Example 1, the core material is formed of only glass chopped strands.
  • the other manufacturing methods of the vacuum heat insulating material according to Comparative Example 1 are the same as those of the vacuum heat insulating material 1 according to Examples 1 to 9.
  • the mass of the whole core material of the vacuum heat insulating material according to Comparative Example 1 is 16000 g. Further, in the vacuum heat insulating material according to Comparative Example 1, the mass ratio of the first core material 21 to the mass of the entire core material is 100.0 mass %.
  • the vacuum heat insulating material according to Comparative Example 2 is the second core used in the vacuum heat insulating material 1 according to Examples 1 to 9 so that the thickness of the core material after completion of the vacuum heat insulating material is 50 mm.
  • a core material is formed by stacking only the material 22. That is, in the vacuum heat insulating material according to Comparative Example 2, the core material is formed of only glass short fibers.
  • the other manufacturing method of the vacuum heat insulating material according to Comparative Example 2 is the same as that of the vacuum heat insulating material 1 according to Examples 1 to 9.
  • the mass of the whole core material of the vacuum heat insulating material according to Comparative Example 2 is 12000 g. Further, in the vacuum heat insulating material according to Comparative Example 2, the ratio of the mass of the first core material 21 to the mass of the entire core material is 0.0 mass %.
  • the thickness and thermal conductivity of the vacuum heat insulating material 1 according to each example and the vacuum heat insulating material according to each comparative example were measured by using a heat conductivity measuring device (HC-074 600, Eiko Seiki Co., Ltd.).
  • the flexural modulus of the vacuum heat insulating material 1 according to each example and the vacuum heat insulating material according to each comparative example was measured by a three-point bending test speed of 10 mm/min using a universal testing machine after measuring the thermal conductivity.
  • the density of the core material of the vacuum heat insulating material 1 according to each example and the vacuum heat insulating material according to each comparative example was calculated by dividing the mass of the whole core material by the volume of the vacuum heat insulating material.
  • the vacuum heat insulating materials 1 according to Examples 1 to 9 have bending elasticity as compared with the vacuum heat insulating material according to Comparative Example 1 in which the core material is formed of only glass chopped strands. The rate is high.
  • the vacuum heat insulating materials 1 according to Examples 1 to 9 have a lower density of the core material than the vacuum heat insulating material according to Comparative Example 1 in which the core material is formed of only glass chopped strands. That is, the vacuum heat insulating materials 1 according to Examples 1 to 9 are lighter than the vacuum heat insulating materials according to Comparative Example 1 in which the core material is formed of only glass chopped strands.
  • the vacuum heat insulating materials 1 according to Examples 1 to 9 are easier to handle than the vacuum heat insulating materials according to Comparative Example 1 in which the core material is formed of only glass chopped strands. Further, as shown in Table 1 and Table 2, the vacuum heat insulating material 1 according to Examples 1 to 9 has a higher heat insulating material than the vacuum heat insulating material according to Comparative Example 2 in which the core material is formed of only glass short fibers. Low thermal conductivity. Therefore, the vacuum heat insulating materials 1 according to Examples 1 to 9 have improved heat insulating performance as compared with the vacuum heat insulating material according to Comparative Example 2 in which the core material is formed of only glass short fibers. As described above, the vacuum heat insulating materials 1 according to Examples 1 to 9 are vacuum heat insulating materials having improved heat insulating performance and easy to handle.
  • the ratio of the mass of the first core material 21 to the mass of the entire core material 20 is preferably 75 mass% or less.
  • the density of the core material 20 of the vacuum heat insulating material 1 further decreases. Therefore, by further reducing the ratio of the mass of the first core material 21 to the mass of the core material 20 as a whole, a lighter vacuum heat insulating material 1 can be obtained, and the vacuum heat insulating material 1 becomes easier to handle. ..
  • the ratio of the mass of the first core material 21 to the mass of the whole core material 20 is preferably 25 mass% or more. That is, when the heat insulation performance of the vacuum heat insulating material 1 is further improved and the vacuum heat insulating material 1 is handled more easily, the ratio of the mass of the first core material 21 to the mass of the whole core material 20 is 25 mass %. It is above, and it is desirable that it is 75 mass% or less.
  • the mass ratio of the first core material 21 to the mass of the whole core material 20 is 36 mass %. It is above, and it is desirable that it is 67 mass% or less.
  • Example 10 the vacuum heat insulating material 1 of the first embodiment was manufactured as Example 10 and Example 11, and the occurrence rate of vacuum leakage was compared with Comparative Example 3.
  • the comparison result is shown in Table 3, and the comparison result will be described below.
  • the core material 20 of the vacuum heat insulating material 1 according to the tenth embodiment is used in the vacuum heat insulating material 1 according to the first to ninth embodiments so that the thickness of the core material 20 after the completion of the vacuum heat insulating material 1 is 50 mm. 6 sheets of the second core material 22 thus obtained are laminated, and 20 sheets of the first core material 21 used in the vacuum heat insulating material 1 according to the examples 1 to 9 are laminated on one side of the second core material 22. Formed.
  • the other manufacturing method of the vacuum heat insulating material 1 according to the tenth embodiment is the same as that of the vacuum heat insulating material 1 according to the first to ninth embodiments. That is, in the core material 20 of the vacuum heat insulating material 1 according to Example 10, the first surface 23 or the second surface 24 is composed of the first core material 21 which is a needle mat of glass chopped strands.
  • the core material 20 of the vacuum heat insulating material 1 according to the eleventh embodiment is used in the vacuum heat insulating material 1 according to the first to ninth embodiments so that the thickness of the core material 20 after the completion of the vacuum heat insulating material 1 is 50 mm. 6 sheets of the second core material 22 thus obtained are laminated, and 10 sheets of the first core material 21 used in the vacuum heat insulating material 1 according to the examples 1 to 9 are laminated on one side of the second core material 22. On the other side of the second core material 22, ten first core materials 21 used in the vacuum heat insulating material 1 according to Examples 1 to 9 were laminated.
  • both the first surface 23 and the second surface 24 are composed of the first core material 21 which is a needle mat of glass chopped strands.
  • the core material of the vacuum heat insulating material according to Comparative Example 3 was used in the vacuum heat insulating material 1 according to Examples 1 to 9 so that the thickness of the core material after completion of the vacuum heat insulating material was 50 mm.
  • the core material 22 was formed by laminating 10 sheets.
  • Other manufacturing methods of the vacuum heat insulating material according to Comparative Example 3 are the same as those of the vacuum heat insulating material 1 according to Examples 1 to 9. That is, the core material of the vacuum heat insulating material according to Comparative Example 3 was composed of only glass short fibers.
  • the vacuum heat insulating material according to Comparative Example 3 in which the core material was formed of only glass short fibers, the occurrence rate of defective vacuum leakage was 5.1%.
  • the vacuum heat insulating material 1 according to Example 10 in which the first surface 23 or the second surface 24 of the core material 20 is constituted by the first core material 21 which is the needle mat of glass chopped strands, the vacuum leakage defect occurs. The rate is reduced to 2.2%.
  • the vacuum heat insulating material 1 according to the example 11 in which both the first surface 23 and the second surface 24 of the core material 20 are composed of the first core material 21 which is the needle mat of the glass chopped strand has a poor vacuum leakage.
  • the vacuum heat insulating material 1 according to the first embodiment can suppress the occurrence of defective vacuum leakage, as compared with the vacuum heat insulating material using the core material formed of only the glass short fibers.
  • the shape of shots contained in short glass fibers which causes vacuum leakage defects, is from several tens of micrometers to several hundreds of micrometers.
  • the first core material 21 used in Examples 1 to 11 has a thickness of about 1 mm after the vacuum heat insulating material 1 is completed. Therefore, in order to suppress the vacuum leakage failure caused by the through holes being formed in the outer packaging material 3 by the shot, at least one first core material 22 is formed outside the second core material 22 formed of short glass fibers.
  • the core material 21 may be provided. In other words, in order to suppress the vacuum leakage failure caused by the through hole being formed in the outer packaging material 3 by the shot, the first core material 21 is provided outside the second core material 22 formed of short glass fibers.
  • the thickness may be at least about 1 mm.
  • the vacuum heat insulating material 1 includes the core material 20 and the outer packaging material 3 that wraps the core material 20, and the internal space covered with the outer packaging material 3 is in a depressurized state. It is a vacuum insulation material.
  • the core material 20 includes a first core material 21 which is a needle mat of glass chopped strands, and a second core material 22 formed of short glass fibers, and the first core material 21 and the second core material 22. Are laminated in the thickness direction of the vacuum heat insulating material 1.
  • the vacuum heat insulating material 1 In the vacuum heat insulating material 1 according to the first embodiment, at least one of the two surfaces of the core material 20 facing the outer packaging material 3 in the thickness direction of the vacuum heat insulating material 1 and in contact with the outer packaging material 3 is , The first core member 21.
  • the vacuum heat insulating material 1 according to the first embodiment at least one of the two surfaces of the outer packaging material 3 and the core material 20 facing the thickness direction of the vacuum heat insulating material 1 and in contact with the outer packaging material 3 is glass. It is the first core material 21 which is a needle mat of chopped strands. Therefore, the vacuum heat insulating material 1 according to the first embodiment is less likely to cause a vacuum leak defect due to the through hole formed in the outer packaging material 3 as compared with the conventional vacuum heat insulating material using the core material formed of short glass fibers. It can be suppressed.
  • the core material 20 of the vacuum heat insulating material 1 according to the first embodiment is formed by laminating the first core material 21 which is a needle mat of glass chopped strands and the second core material 22 formed of glass short fibers. It is configured. Therefore, the vacuum heat insulating material 1 according to the first embodiment has improved rigidity and lighter mass as compared with the conventional vacuum heat insulating material using glass chopped strands as the core material. Moreover, the core material 20 of the vacuum heat insulating material 1 according to the first embodiment can be manufactured without using a binder. Therefore, the vacuum heat insulating material 1 according to the first embodiment is easier to handle than a conventional vacuum heat insulating material using glass chopped strands as a core material, even without using a binder.
  • Embodiment 2 an example of a heat insulating box provided with the vacuum heat insulating material 1 according to the first embodiment will be described.
  • items that are not particularly described are the same as those in the first embodiment, and the same functions and configurations are described using the same reference numerals.
  • FIG. 3 is a sectional view showing a schematic configuration of a heat insulation box according to Embodiment 2 of the present invention.
  • the heat insulation box 100 is used, for example, in a refrigerator or the like that requires high heat insulation performance.
  • the heat insulation box 100 includes an outer box 120 and an inner box 110 arranged inside the outer box 120.
  • the vacuum heat insulating material 1 described in the first embodiment is arranged between the inner case 110 and the outer case 120, and the inner case 110 and the outer case 120 are thermally insulated.
  • the position where the vacuum heat insulating material 1 is arranged is not particularly limited as long as it is a position where heat can be insulated between the inner box 110 and the outer box 120.
  • the vacuum heat insulating material 1 may be arranged so as to come into contact with the surface of the inner box 110 facing the outer box 120.
  • the vacuum heat insulating material 1 may be arranged so as to come into contact with the surface of the outer box 120 facing the inner box 110.
  • a spacer or the like is provided between the inner box 110 or the outer box 120 and the vacuum heat insulating material 1 so that the inner box 110 and the outer box 120 do not come into contact with the vacuum heat insulating material 1. You may arrange
  • the vacuum heat insulating material 1 has higher heat insulating performance than the urethane foam heat insulating material 130 and the like. Therefore, the heat insulating box 100 provided with the vacuum heat insulating material 1 can obtain higher heat insulating performance than the heat insulating box using only the urethane foam heat insulating material 130. However, in the space between the inner box 110 and the outer box 120, a portion other than the vacuum heat insulating material 1 may be filled with the urethane foam heat insulating material 130.
  • the heat insulating box 100 according to the second embodiment is provided with the vacuum heat insulating material 1 which is lighter in weight than the conventional vacuum heat insulating material using glass chopped strands as the core material. Therefore, the heat insulation box 100 according to the second embodiment can be made lighter in weight than a heat insulation box using a conventional vacuum heat insulation material using glass chopped strands as a core material. Further, the heat insulating box 100 according to the second embodiment is provided with the vacuum heat insulating material 1 capable of suppressing defective vacuum leakage more than the conventional vacuum heat insulating material using the core material formed of glass short fibers. Therefore, the heat insulating box 100 according to the second embodiment is different from the heat insulating box in which the conventional vacuum heat insulating material using the core material formed of the glass short fibers is used in manufacturing the heat insulating box 100. Yield is improved.
  • the structure in which the vacuum heat insulating material 1 is used in the heat insulating box 100 of the refrigerator including the cold heat source is taken as an example, but the present invention is not limited to this.
  • the vacuum heat insulating material 1 can also be used for a heat insulating box of a heat storage box provided with a heat source.
  • the vacuum heat insulating material 1 can also be used for a heat insulating box that does not include a cold heat source and a warm heat source, such as a cooler box.
  • the vacuum heat insulating material 1 may be used not only as a heat insulating box but also as a heat insulating member for a cooling or heating device such as an air conditioner, a vehicle air conditioner, and a water heater. Further, the vacuum heat insulating material 1 may be used for a heat insulating container or the like.
  • the shape of the vacuum heat insulating material 1 is not limited to the flat plate shape described above.
  • the vacuum heat insulating material 1 may be formed in a curved surface shape that is convex upward or downward in FIG.
  • the vacuum heat insulating material 1 may be used for a heat insulating bag having a deformable outer bag and an inner bag.

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Abstract

Provided is a vacuum heat insulation material, which is a sheet-shaped vacuum heat insulation material that comprises a core material and an outer packaging material enveloping the core material and in which an interior space covered by the outer packaging material is in a reduced-pressure state, wherein the core material comprises a first core material that is a glass chopped strand needle mat and a second core material formed from short glass fibers and is configured such that the first core material and the second core material are laminated in the thickness direction of the vacuum heat insulation material, and at least one surface of the two surfaces of the core material which face the outer packaging material in the thickness direction and contact the outer packaging material is configured from the first core material.

Description

真空断熱材及び断熱箱Vacuum insulation and insulation box
　本発明は、芯材としてガラス繊維を用いた真空断熱材、及び該真空断熱材を備えた断熱箱に関する。 The present invention relates to a vacuum heat insulating material using glass fiber as a core material, and a heat insulating box equipped with the vacuum heat insulating material.
　冷蔵庫等の断熱箱に用いられている断熱材として、真空断熱材が知られている。真空断熱材は、芯材と該芯材を包む外包材とを備え、外包材で覆われた内部空間が減圧状態となっている。従来の真空断熱材としては、ガラス短繊維（ｇｌａｓｓ　ｗｏｏｌ）で芯材が形成されたものが知られている（例えば、特許文献１参照）。ガラス短繊維は、溶融ガラスを高速回転スピナにより遠心力で飛ばすことによりガラスを繊維化する遠心法によって、形成される。あるいは、ガラス短繊維は、ガラス棒の先端部を火炎で溶融しながら吹き飛ばすことによりガラスを繊維化する火炎法によって、形成される。ガラス短繊維は、ガラスウールとも呼ばれる。 Vacuum insulation is known as the insulation used in insulation boxes such as refrigerators. The vacuum heat insulating material includes a core material and an outer packaging material that wraps the core material, and the internal space covered with the outer packaging material is in a reduced pressure state. As a conventional vacuum heat insulating material, there is known one in which a core material is formed of glass short fibers (see, for example, Patent Document 1). Short glass fibers are formed by a centrifugal method in which molten glass is blown off by a centrifugal force with a high-speed rotating spinner to form glass into fibers. Alternatively, the short glass fibers are formed by a flame method in which glass is made into fibers by blowing away the tip of a glass rod while melting it with a flame. Short glass fibers are also called glass wool.
　また、従来の真空断熱材としては、芯材としてガラスチョップドストランド（ｇｌａｓｓ　ｃｈｏｐｐｅｄ　ｓｔｒａｎｄ）を用いたものが知られている（例えば、特許文献２参照）。ガラスチョップドストランドは、ガラスストランドを規定の長さに切断することにより形成される。また、ガラスストランドは、連続フィラメント法で紡糸ノズルから引き出した複数のガラス繊維を、直接引きそろえて集束したものである。具体的には、芯材としてガラスチョップドストランドを用いた従来の真空断熱材では、ガラスチョップドストランドがモノフィラメント化した不織布を湿式抄紙法によって形成し、該不織布を複数枚積層して芯材を形成している。芯材としてガラスチョップドストランドを用いることにより、ガラス短繊維で形成された芯材を用いる場合と比べ、真空断熱材の断熱性能を向上させることができる。 Also, as a conventional vacuum heat insulating material, one using glass chopped strand as a core material is known (for example, refer to Patent Document 2). The glass chopped strand is formed by cutting the glass strand into a specified length. Further, the glass strand is a plurality of glass fibers drawn from a spinning nozzle by a continuous filament method and directly aligned and bundled. Specifically, in a conventional vacuum heat insulating material using glass chopped strands as a core material, a nonwoven fabric in which glass chopped strands are made into monofilaments is formed by a wet papermaking method, and a plurality of the nonwoven fabrics are laminated to form a core material. ing. By using glass chopped strands as the core material, the heat insulating performance of the vacuum heat insulating material can be improved as compared with the case of using the core material formed of short glass fibers.
特許第３５８０３１５号公報Japanese Patent No. 3580315 特許第４７１３５６６号公報Japanese Patent No. 4713566
　ガラス短繊維を製造する際、未延伸ガラス粒子の塊であるショットが発生する。そして、ショットはガラス短繊維内に含まれる。このため、ガラス短繊維で形成された芯材を用いた従来の真空断熱材においては、ショットによって外包材に貫通孔が形成されてしまう場合があった。そして、ガラス短繊維で形成された芯材を用いた従来の真空断熱材においては、ショットによって外包材に形成された貫通孔から真空断熱材の内部に空気が侵入する場合があった。すなわち、ガラス短繊維で形成された芯材を用いた従来の真空断熱材においては、ショットによって外包材に形成された貫通孔により、真空漏れ不良に至り、真空断熱材の断熱性能が低下してしまうという課題があった。 When producing glass short fibers, shots, which are lumps of unstretched glass particles, occur. The shot is then contained within the glass short fibers. For this reason, in the conventional vacuum heat insulating material using the core material formed of short glass fibers, there is a case where a through hole is formed in the outer packaging material by the shot. In a conventional vacuum heat insulating material using a core material formed of short glass fibers, air may enter the inside of the vacuum heat insulating material through a through hole formed in the outer packaging material by a shot. That is, in the conventional vacuum heat insulating material using the core material formed of short glass fibers, the through holes formed in the outer packaging material by the shot lead to a vacuum leak defect, and the heat insulating performance of the vacuum heat insulating material deteriorates. There was a problem of being lost.
　一方、芯材としてガラスチョップドストランドを用いた従来の真空断熱材には、芯材にショットが含まれない。このため、芯材としてガラスチョップドストランドを用いた従来の真空断熱材は、外包材に形成された貫通孔によって真空漏れ不良に至ることはまれである。しかしながら、芯材としてガラスチョップドストランドを用いた従来の真空断熱材は、ガラス短繊維で形成された芯材を用いた従来の真空断熱材と比べ、剛性が低くなる。このため、芯材としてガラスチョップドストランドを用いた従来の真空断熱材は、製造時に曲がりやすく、製造後においても曲がりやすい。したがって、芯材としてガラスチョップドストランドを用いた従来の真空断熱材は、ガラス短繊維で形成された芯材を用いた従来の真空断熱材と比べ、取り扱いが困難であるという課題があった。また、芯材としてガラスチョップドストランドを用いた従来の真空断熱材は、ガラス短繊維で形成された芯材を用いた従来の真空断熱材と比べ、約１．２倍から約１．６倍、質量が重くなる。この点においても、芯材としてガラスチョップドストランドを用いた従来の真空断熱材は、ガラス短繊維で形成された芯材を用いた従来の真空断熱材と比べ、取り扱いが困難である。 On the other hand, the conventional vacuum heat insulating material using glass chopped strands as the core material does not include shots in the core material. For this reason, the conventional vacuum heat insulating material using glass chopped strands as the core material rarely causes vacuum leakage failure due to the through holes formed in the outer packaging material. However, the conventional vacuum heat insulating material using glass chopped strands as the core material has lower rigidity than the conventional vacuum heat insulating material using the core material formed of short glass fibers. For this reason, the conventional vacuum heat insulating material using glass chopped strands as the core material is easily bent at the time of manufacture and is easily bent even after the manufacture. Therefore, the conventional vacuum heat insulating material using glass chopped strands as the core material has a problem that it is difficult to handle as compared with the conventional vacuum heat insulating material using the core material formed of short glass fibers. In addition, the conventional vacuum heat insulating material using glass chopped strands as the core material is about 1.2 times to about 1.6 times more than the conventional vacuum heat insulating material using the core material formed of glass short fibers. The weight becomes heavy. Also in this respect, the conventional vacuum heat insulating material using glass chopped strands as the core material is more difficult to handle than the conventional vacuum heat insulating material using the core material formed of short glass fibers.
　なお、ガラスチョップドストランドを用いた従来の芯材に有機バインダー等の結合剤を用い、結合剤によってガラス繊維同士を結合させることにより、ガラスチョップドストランドを用いた従来の芯材の剛性を高めることは可能である。すなわち、結合剤によってガラス繊維同士を結合させると、芯材としてガラスチョップドストランドを用いた従来の真空断熱材の取り扱いが容易となる。しかしながら、結合剤によってガラス繊維同士を結合させると、ガラス繊維同士の結合部を介して、ガラス繊維間の熱移動が容易となる。このため、真空断熱材の断熱性能が低下してしまう。また、結合剤によってガラス繊維同士を結合させると、結合剤に含まれる低分子成分が真空断熱材内部で揮発することにより、真空断熱材内部の真空度が低下し、断熱性能が低下してしまう。すなわち、結合剤によってガラス繊維同士を結合させると、ガラス短繊維で形成された芯材を用いる場合と比べて真空断熱材の断熱性能が向上するという、芯材としてガラスチョップドストランドを用いた従来の真空断熱材が有する効果が低減してしまう。 In addition, using a binder such as an organic binder in the conventional core material using glass chopped strands, by binding the glass fibers by the binder, it is possible to increase the rigidity of the conventional core material using glass chopped strands It is possible. That is, when the glass fibers are bonded to each other by the binder, it becomes easy to handle the conventional vacuum heat insulating material using glass chopped strands as the core material. However, when the glass fibers are bonded to each other by the binder, heat transfer between the glass fibers becomes easy via the bonding part between the glass fibers. Therefore, the heat insulating performance of the vacuum heat insulating material is deteriorated. Further, when the glass fibers are bonded to each other by the binder, the low-molecular component contained in the binder is volatilized inside the vacuum heat insulating material, so that the vacuum degree inside the vacuum heat insulating material is lowered and the heat insulating performance is lowered. .. That is, when the glass fibers are bonded to each other by the binder, the heat insulating performance of the vacuum heat insulating material is improved as compared with the case of using the core material formed of short glass fibers, that is, the conventional glass chopped strand as the core material is used. The effect that the vacuum heat insulating material has is reduced.
　本発明は、上述の課題を背景になされたものであり、外包材に形成された貫通孔によって真空漏れ不良に至ることを抑制でき、結合剤を用いなくとも取り扱いが容易となる真空断熱材を得ることを第１の目的とする。また、本発明は、このような真空断熱材を備えた断熱箱を得ることを第２の目的とする。 The present invention has been made in view of the above-mentioned problems, and a vacuum heat insulating material that can suppress vacuum leakage failure due to a through hole formed in an outer packaging material and can be easily handled without using a binder is provided. The first purpose is to obtain. A second object of the present invention is to obtain a heat insulating box provided with such a vacuum heat insulating material.
　本発明に係る真空断熱材は、芯材と、前記芯材を包む外包材とを備え、前記外包材で覆われた内部空間が減圧状態となっている板状の真空断熱材であって、前記芯材は、ガラスチョップドストランドのニードルマットである第１芯材と、ガラス短繊維で形成された第２芯材とを備え、前記第１芯材と前記第２芯材とが当該真空断熱材の厚み方向に積層された構成であり、前記外包材と前記厚み方向に対向して該外包材と接する前記芯材の２面のうちの少なくとも１面は、前記第１芯材で構成されている。 The vacuum heat insulating material according to the present invention is a plate-shaped vacuum heat insulating material having a core material and an outer packaging material that wraps the core material, and the internal space covered with the outer packaging material is in a reduced pressure state, The core material includes a first core material that is a needle mat of glass chopped strands and a second core material formed of short glass fibers, and the first core material and the second core material are vacuum-insulated. At least one of the two surfaces of the core material that is laminated in the thickness direction of the material and is in contact with the outer packaging material facing the outer packaging material in the thickness direction is composed of the first core material. ing.
　また、本発明に係る断熱箱は、外箱と、前記外箱の内部に配置された内箱と、本発明に係る真空断熱材と、を備えている。 The heat insulating box according to the present invention includes an outer box, an inner box arranged inside the outer box, and a vacuum heat insulating material according to the present invention.
　本発明に係る真空断熱材においては、外包材と真空断熱材の厚み方向に対向して該外包材と接する芯材の２面のうちの少なくとも１面が、ガラスチョップドストランドのニードルマットである第１芯材となっている。このため、本発明に係る真空断熱材は、ガラス短繊維で形成された芯材を用いた従来の真空断熱材に比べ、外包材に形成された貫通孔によって真空漏れ不良に至ることを抑制できる。 In the vacuum heat insulating material according to the present invention, at least one of the two surfaces of the outer packaging material and the core material facing in the thickness direction of the vacuum heat insulating material and in contact with the outer packaging material is a needle mat of glass chopped strands. It is a single core material. Therefore, the vacuum heat insulating material according to the present invention can suppress the vacuum leakage failure due to the through hole formed in the outer packaging material, as compared with the conventional vacuum heat insulating material using the core material formed of short glass fibers. ..
　また、本発明に係る真空断熱材の芯材は、ガラスチョップドストランドのニードルマットである第１芯材とガラス短繊維で形成された第２芯材とが積層されて構成されている。このため、本発明に係る真空断熱材は、芯材としてガラスチョップドストランドを用いた従来の真空断熱材と比べ、剛性が向上し、質量も軽くなる。また、本発明に係る真空断熱材の芯材は、結合剤を用いなくとも製造することができる。したがって、本発明に係る真空断熱材は、結合剤を用いなくとも、芯材としてガラスチョップドストランドを用いた従来の真空断熱材と比べ、取り扱いが容易となる。 The core material of the vacuum heat insulating material according to the present invention is configured by laminating the first core material, which is a needle mat of glass chopped strands, and the second core material formed of glass short fibers. Therefore, the vacuum heat insulating material according to the present invention has improved rigidity and lighter mass as compared with the conventional vacuum heat insulating material using glass chopped strands as the core material. Further, the core material of the vacuum heat insulating material according to the present invention can be manufactured without using a binder. Therefore, the vacuum heat insulating material according to the present invention is easier to handle than a conventional vacuum heat insulating material using glass chopped strands as a core material without using a binder.
本発明の実施の形態１に係る真空断熱材の概略構成を示す断面図である。It is sectional drawing which shows schematic structure of the vacuum heat insulating material which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る真空断熱材の別の一例の概略構成を示す断面図である。It is sectional drawing which shows schematic structure of another example of the vacuum heat insulating material which concerns on Embodiment 1 of this invention. 本発明の実施の形態２に係る断熱箱の概略構成を示す断面図である。It is sectional drawing which shows schematic structure of the heat insulation box which concerns on Embodiment 2 of this invention.
　以下、実施の形態１において、本発明に係る真空断熱材の一例について説明する。また、実施の形態２において、本発明に係る断熱箱の一例について説明する。なお、以下の各図面では、各構成部材の大きさの関係が本発明を実施した実物とは異なる場合がある。各構成部材の具体的な寸法等は、以下の説明を参酌した上で判断すべきものである。また、以下の実施の形態で用いられているガラス繊維に関する用語は、注記がされていない場合、日本工業規格ＪＩＳ　Ｒ３４１０：２００６「ガラス繊維用語」の定義に従うこととする。 Hereinafter, an example of the vacuum heat insulating material according to the present invention in the first embodiment will be described. Moreover, in Embodiment 2, an example of the heat insulation box according to the present invention will be described. In each of the following drawings, the size relationship of each component may be different from that of the actual product in which the present invention is implemented. Specific dimensions and the like of each constituent member should be determined in consideration of the following description. Unless otherwise noted, the terms relating to glass fibers used in the following embodiments shall follow the definitions of Japanese Industrial Standard JIS R3410:2006 “Glass Fiber Terms”.
実施の形態１．
　図１は、本発明の実施の形態１に係る真空断熱材の概略構成を示す断面図である。真空断熱材１は、内部を真空に維持することで低い熱伝導率を実現する断熱材である。図１に示すように、この真空断熱材１は、芯材２０と、この芯材２０を包む外包材３とを備えている。後述のように、外包材３で規定される真空空間は、一部が開口した袋形状の外包材３の内部を減圧した状態で、開口部をヒートシール等により熱融着することにより、形成される。つまり、外包材３で覆われた内部空間が減圧状態となっている。真空断熱材１は、該真空断熱材１の厚み方向に観察した際、換言すると図１の紙面上下方向に観察した際、全体として概略長方形の板状に形成されている。なお、本実施の形態１においては、真空断熱材１は、外包材３で覆われた内部空間に、少なくとも水分を吸着する吸着剤４も備えている。つまり、本実施の形態１に係る真空断熱材１は、芯材２０及び吸着剤４が、外包材３によって包まれている。 Embodiment 1.
FIG. 1 is a sectional view showing a schematic configuration of a vacuum heat insulating material according to the first embodiment of the present invention. The vacuum heat insulating material 1 is a heat insulating material that realizes low thermal conductivity by maintaining a vacuum inside. As shown in FIG. 1, the vacuum heat insulating material 1 includes a core material 20 and an outer packaging material 3 that wraps the core material 20. As described below, the vacuum space defined by the outer wrapping material 3 is formed by heat-sealing the opening portion by heat sealing or the like in a state where the inside of the bag-shaped outer wrapping material 3 having an opening is depressurized. To be done. That is, the internal space covered with the outer packaging material 3 is in a reduced pressure state. The vacuum heat insulating material 1 is formed in a generally rectangular plate shape as a whole when observed in the thickness direction of the vacuum heat insulating material 1, in other words, when observed in the vertical direction of the paper surface of FIG. In the first embodiment, the vacuum heat insulating material 1 also includes an adsorbent 4 that adsorbs at least water in the internal space covered with the outer packaging material 3. That is, in the vacuum heat insulating material 1 according to the first embodiment, the core material 20 and the adsorbent 4 are wrapped with the outer packaging material 3.
　芯材２０は、真空空間を保持する目的で使用される。本実施の形態１に係る芯材２０は、ガラスチョップドストランド（ｇｌａｓｓ　ｃｈｏｐｐｅｄ　ｓｔｒａｎｄ）のニードルマットである第１芯材２１と、ガラス短繊維（ｇｌａｓｓ　ｗｏｏｌ）で形成された第２芯材２２とを備えている。そして、芯材２０は、第１芯材２１と第２芯材２２とが真空断熱材１の厚み方向に積層された構成となっている。 The core material 20 is used for the purpose of maintaining a vacuum space. The core material 20 according to the first embodiment includes a first core material 21 that is a needle mat of glass chopped strand and a second core material 22 formed of glass short fibers (glasswool). I have it. The core material 20 has a structure in which the first core material 21 and the second core material 22 are laminated in the thickness direction of the vacuum heat insulating material 1.
　第１芯材２１であるガラスチョップドストランドのニードルマットは、規定の長さのガラスチョップドストランドを無方向に均一な厚さに積み重ね、針打ちによってマット状にまとめたものである。ガラスチョップドストランドは、ガラスストランドを規定の長さに切断することにより形成される。また、ガラスストランドは、連続フィラメント法で紡糸ノズルから引き出した複数のガラス繊維を、直接引きそろえて集束したものである。このように構成されている第１芯材２１は、結合剤を含まずに製造することができる。なお、日本工業規格ＪＩＳ　Ｒ３４１０：２００６「ガラス繊維用語」では、ニードルマットは、長さ約５０ｍｍのガラスチョップドストランドを用いることとなっている。しかしながら、ガラスチョップドストランドのこの長さは一例であり、種々の長さのガラスチョップドストランドでニードルマットを形成することができる。本実施の形態１では、約１００ｍｍのガラスチョップドストランドで、ニードルマットを形成している。 The glass chopped strand needle mat that is the first core material 21 is formed by stacking glass chopped strands of a specified length in a uniform thickness in a non-directional manner and then stitching them together to form a mat. The glass chopped strand is formed by cutting the glass strand into a specified length. Further, the glass strand is a plurality of glass fibers drawn from a spinning nozzle by a continuous filament method and directly aligned and bundled. The 1st core material 21 comprised in this way can be manufactured without containing a binder. According to Japanese Industrial Standard JIS R3410:2006 “Glass fiber terminology”, the needle mat uses glass chopped strands having a length of about 50 mm. However, this length of glass chopped strands is an example, and glass chopped strands of various lengths can form the needle mat. In the first embodiment, the needle mat is formed of about 100 mm of glass chopped strands.
　第１芯材２１であるガラスチョップドストランドのニードルマットは、真空断熱材１の厚み方向である断熱方向に対して略垂直に、ガラスチョップドストランドが延びている。また、真空断熱材１の厚み方向である断熱方向に、ガラスチョップドストランドが積層される。このため、ガラスチョップドストランドのニードルマットである第１芯材２１を用いた真空断熱材１は、ガラス短繊維で形成された芯材を用いた従来の真空断熱材に比べ、断熱性能が向上する。また、第１芯材２１は、針打ちによりガラスチョップドストランド同士が絡み合っている。このため、第１芯材２１を製造する際、有機バインダー等の結合剤を用いる必要がない。したがって、第１芯材２１は、結合剤によってガラス繊維同士が結合した結合部を介して熱移動することを防止できる。また、第１芯材２１は、結合剤に含まれる低分子成分の揮発による真空断熱材１の断熱性能の低下も防止できる。 In the glass chopped strand needle mat that is the first core member 21, the glass chopped strand extends substantially perpendicular to the heat insulating direction that is the thickness direction of the vacuum heat insulating material 1. Further, glass chopped strands are laminated in the heat insulating direction which is the thickness direction of the vacuum heat insulating material 1. Therefore, the vacuum heat insulating material 1 using the first core material 21 which is the needle mat of glass chopped strands has improved heat insulating performance as compared with the conventional vacuum heat insulating material using the core material formed of glass short fibers. .. Further, the first core member 21 has glass chopped strands intertwined with each other by needle punching. Therefore, when manufacturing the first core material 21, it is not necessary to use a binder such as an organic binder. Therefore, the first core material 21 can prevent heat transfer from the bonding portion where the glass fibers are bonded to each other by the bonding agent. In addition, the first core material 21 can also prevent deterioration of the heat insulating performance of the vacuum heat insulating material 1 due to volatilization of low molecular components contained in the binder.
　第２芯材２２を構成するガラス短繊維は、溶融ガラスを高速回転スピナにより遠心力で飛ばすことによりガラスを繊維化する遠心法によって、形成される。なお、第２芯材２２を構成するガラス短繊維は、ガラス棒の先端部を火炎で溶融しながら吹き飛ばすことによりガラスを繊維化する火炎法によって、形成されてもよい。ガラス短繊維は、ガラスウールとも呼ばれる。 The glass short fibers forming the second core material 22 are formed by a centrifugal method in which the molten glass is spun by a high-speed rotating spinner by centrifugal force to form the glass into fibers. The short glass fibers forming the second core member 22 may be formed by a flame method in which the tip of a glass rod is melted by a flame and blown away while the glass is made into fibers. Short glass fibers are also called glass wool.
　ところで、芯材としてガラスチョップドストランドを用いた従来の真空断熱材は、ガラス短繊維で形成された芯材を用いた従来の真空断熱材と比べ、剛性が低くなる。このため、芯材としてガラスチョップドストランドを用いた従来の真空断熱材は、製造時に曲がりやすく、製造後においても曲がりやすい。したがって、芯材としてガラスチョップドストランドを用いた従来の真空断熱材は、ガラス短繊維で形成された芯材を用いた従来の真空断熱材と比べ、取り扱いが困難である。また、芯材としてガラスチョップドストランドを用いた従来の真空断熱材は、ガラス短繊維で形成された芯材を用いた従来の真空断熱材と比べ、約１．２倍から約１．６倍、質量が重くなる。この点においても、芯材としてガラスチョップドストランドを用いた従来の真空断熱材は、ガラス短繊維で形成された芯材を用いた従来の真空断熱材と比べ、取り扱いが困難である。一方、本実施の形態１では、上述のように、芯材２０は、第１芯材２１と第２芯材２２とが真空断熱材１の厚み方向に積層された構成となっている。このため、本実施の形態１に係る真空断熱材１は、ガラスチョップドストランドを用いた従来の芯材と比べ、剛性が向上し、質量も軽くなる。したがって、本実施の形態１に係る真空断熱材１は、ガラスチョップドストランドを用いた従来の芯材と比べ、取り扱いが容易となる。 By the way, the conventional vacuum heat insulating material that uses glass chopped strands as the core material has lower rigidity than the conventional vacuum heat insulating material that uses the core material formed of short glass fibers. For this reason, the conventional vacuum heat insulating material using glass chopped strands as the core material is easily bent at the time of manufacture and is easily bent even after the manufacture. Therefore, the conventional vacuum heat insulating material using glass chopped strands as the core material is more difficult to handle than the conventional vacuum heat insulating material using the core material formed of short glass fibers. In addition, the conventional vacuum heat insulating material using glass chopped strands as the core material is about 1.2 times to about 1.6 times more than the conventional vacuum heat insulating material using the core material formed of glass short fibers. The weight becomes heavy. Also in this respect, the conventional vacuum heat insulating material using glass chopped strands as the core material is more difficult to handle than the conventional vacuum heat insulating material using the core material formed of short glass fibers. On the other hand, in the first embodiment, as described above, the core material 20 has a configuration in which the first core material 21 and the second core material 22 are laminated in the thickness direction of the vacuum heat insulating material 1. Therefore, the vacuum heat insulating material 1 according to the first embodiment has improved rigidity and lighter mass than the conventional core material using glass chopped strands. Therefore, the vacuum heat insulating material 1 according to the first embodiment is easier to handle than the conventional core material using glass chopped strands.
　ここで、外包材３と真空断熱材１の厚み方向に対向して該外包材３と接する芯材２０の２面のうちの一方を、第１面２３とする。また、外包材３と真空断熱材１の厚み方向に対向して該外包材３と接する芯材２０の２面のうちの他方を、第２面２４とする。このように第１面２３及び第２面２４を定義した場合、図１に示すように、芯材２０の第１面２３は、ガラスチョップドストランドのニードルマットである第１芯材２１で構成されている。すなわち、外包材３と芯材２０の第１面２３とが接触する範囲では、外包材３とガラスチョップドストランドのニードルマットとが接触することとなる。 Here, one of the two surfaces of the core material 20 facing the outer packaging material 3 and the vacuum heat insulating material 1 in the thickness direction and in contact with the outer packaging material 3 is referred to as a first surface 23. In addition, the other of the two surfaces of the core material 20 that faces the outer packaging material 3 and the vacuum heat insulating material 1 in the thickness direction and is in contact with the outer packaging material 3 is referred to as a second surface 24. When the first surface 23 and the second surface 24 are defined in this way, as shown in FIG. 1, the first surface 23 of the core member 20 is composed of the first core member 21 which is a needle mat of glass chopped strands. ing. That is, in the range where the outer packaging material 3 and the first surface 23 of the core material 20 are in contact with each other, the outer packaging material 3 and the needle mat of the glass chopped strands are in contact with each other.
　なお、芯材２０の第２面２４を、ガラスチョップドストランドのニードルマットである第１芯材２１で構成してもよい。この場合、外包材３と芯材２０の第２面２４とが接触する範囲では、外包材３とガラスチョップドストランドのニードルマットとが接触することとなる。また、以下の図２のように芯材２０を構成してもよい。 The second surface 24 of the core material 20 may be composed of the first core material 21, which is a needle mat of glass chopped strands. In this case, the outer packaging material 3 and the needle mat of the glass chopped strands come into contact with each other in a range where the outer packaging material 3 and the second surface 24 of the core material 20 are in contact with each other. Moreover, you may comprise the core material 20 like the following FIG.
　図２は、本発明の実施の形態１に係る真空断熱材の別の一例の概略構成を示す断面図である。
　図２に示す様に、芯材２０は、第１面２３及び第２面２４の両面がガラスチョップドストランドのニードルマットである第１芯材２１で構成されていてもよい。すなわち、本実施の形態１に係る芯材２０は、第１面２３及び第２面２４のうちの少なくとも一面が第１芯材２１で構成されていればよい。 FIG. 2 is a sectional view showing a schematic configuration of another example of the vacuum heat insulating material according to the first embodiment of the present invention.
As shown in FIG. 2, the core material 20 may be composed of a first core material 21 that is a needle mat of glass chopped strands on both sides of the first surface 23 and the second surface 24. That is, in the core material 20 according to the first embodiment, at least one of the first surface 23 and the second surface 24 may be composed of the first core material 21.
　ガラス短繊維を製造する際、未延伸ガラス粒子の塊であるショットが発生する。そして、ショットはガラス短繊維内に含まれる。このため、ガラス短繊維で形成された芯材を用いた従来の真空断熱材においては、ショットによって外包材に貫通孔が形成されてしまう場合があった。そして、ガラス短繊維で形成された芯材を用いた従来の真空断熱材においては、ショットによって外包材に形成された貫通孔から真空断熱材の内部に空気が侵入する場合があった。すなわち、ガラス短繊維で形成された芯材を用いた従来の真空断熱材においては、ショットによって外包材に形成された貫通孔により、真空漏れ不良に至り、真空断熱材の断熱性能が低下してしまうという場合があった。一方、ガラスチョップドストランドのニードルマットは、製造工程においてショットが発生しない。このため、本実施の形態１のように芯材２０を構成することにより、外包材３とガラスチョップドストランドのニードルマットである第１芯材２１とが接触する範囲では、ショットによって外包材３に貫通孔が形成されてしまうことを防止できる。このため、本実施の形態１に係る真空断熱材１は、ガラス短繊維で形成された芯材を用いた従来の真空断熱材に比べ、外包材に形成された貫通孔によって真空漏れ不良に至ることを抑制できる。 When producing glass short fibers, shots, which are lumps of unstretched glass particles, occur. The shot is then contained within the glass short fibers. For this reason, in the conventional vacuum heat insulating material using the core material formed of short glass fibers, there is a case where a through hole is formed in the outer packaging material by the shot. In a conventional vacuum heat insulating material using a core material formed of short glass fibers, air may enter the inside of the vacuum heat insulating material through a through hole formed in the outer packaging material by a shot. That is, in the conventional vacuum heat insulating material using the core material formed of short glass fibers, the through holes formed in the outer packaging material by the shot lead to a vacuum leak defect, and the heat insulating performance of the vacuum heat insulating material deteriorates. There was a case that it ended up. On the other hand, in the glass chopped strand needle mat, shots do not occur in the manufacturing process. Therefore, by configuring the core material 20 as in the present first embodiment, the outer packaging material 3 is shot by the shot in the range in which the outer packaging material 3 and the first core material 21, which is the needle mat of the glass chopped strand, are in contact with each other. It is possible to prevent the through hole from being formed. Therefore, the vacuum heat insulating material 1 according to the first embodiment causes a vacuum leak defect due to the through hole formed in the outer packaging material, as compared with the conventional vacuum heat insulating material using the core material formed of short glass fibers. Can be suppressed.
　外包材３は、ガスバリア性を有するものである。外包材３は、多層構造をなすラミネートフィルムである。本実施の形態１では、外包材３は、芯材２０側である内側から外側に向かって順に、ポリエチレン層、アルミ蒸着が施されたエチレン―ビニルアルコール層、アルミ蒸着が施されたポリエチレンテレフタレート層、及び、ナイロン層が積層された構成となっている。なお、外包材３の当該構成はあくまでも一例である。ガスバリア性を有するものであれば、既存の真空断熱材に使用されている種々の外包材を、外包材３として用いることができる。例えば、外包材３は、アルミナ蒸着が施された層を備えていてもよいし、シリカ蒸着が施された層を備えていてもよい。 The outer packaging material 3 has a gas barrier property. The outer packaging material 3 is a laminated film having a multilayer structure. In the first embodiment, the outer wrapping material 3 is a polyethylene layer, an ethylene-vinyl alcohol layer vapor-deposited with aluminum, and a polyethylene terephthalate layer vapor-deposited with aluminum in this order from the inner side to the outer side which is the core material 20 side. , And a nylon layer are laminated. The configuration of the outer packaging material 3 is merely an example. As long as it has gas barrier properties, various outer packaging materials used for existing vacuum heat insulating materials can be used as the outer packaging material 3. For example, the outer packaging material 3 may be provided with a layer vapor-deposited with alumina, or may be provided with a layer vapor-deposited with silica.
　吸着剤４は、真空断熱材１の内部のガス及び水蒸気を吸着し、真空度を保つことで熱伝導率の上昇つまり断熱性能の低下を抑制する目的で使用される。吸着剤４としては、酸化カルシウム（ＣａＯ）を用いることが一般的である。また、吸着剤４は、シリカゲル又はゼオライトであってもよい。また、吸着剤４は、酸化カルシウム、シリカゲル及びゼオライトのうちの少なくとも２つを組合せたものであってもよい。 The adsorbent 4 is used for the purpose of adsorbing gas and water vapor inside the vacuum heat insulating material 1 and maintaining the degree of vacuum to suppress an increase in thermal conductivity, that is, a decrease in heat insulating performance. As the adsorbent 4, it is general to use calcium oxide (CaO). Further, the adsorbent 4 may be silica gel or zeolite. Further, the adsorbent 4 may be a combination of at least two of calcium oxide, silica gel and zeolite.
　続いて、本実施の形態１に係る真空断熱材１の製造工程について説明する。
　まず、２枚の外包材３を重ね合わせ、外周部同士を、一部を除いてヒートシール等で融着する。これにより、外包材３は、外周部の一部が開口した袋形状となる。そして、第１芯材２１及び第２芯材２２を積層して芯材２０を形成し、袋形状に形成された外包材３の内部に挿入する。なお、積層された第１芯材２１及び第２芯材２２を２枚の外包材３で覆い、その後、外包材３の外周部同士を一部を除いて融着してもよい。 Next, the manufacturing process of the vacuum heat insulating material 1 according to the first embodiment will be described.
First, the two outer packaging materials 3 are overlapped and the outer peripheral portions are fused together by heat sealing or the like except for a part. As a result, the outer packaging material 3 has a bag shape in which a part of the outer peripheral portion is opened. Then, the first core material 21 and the second core material 22 are laminated to form the core material 20, and the core material 20 is inserted into the bag-shaped outer packaging material 3. The laminated first core material 21 and second core material 22 may be covered with two outer packaging materials 3, and then the outer peripheral portions of the outer packaging material 3 may be fusion-bonded except for a part thereof.
　その後、袋形状に形成された外包材３の内部に芯材２０が挿入された状態で、１００℃で２時間程度加熱処理する。これにより、芯材２０及び外包材３から水分が除去される。次に、袋形状に形成された外包材３の内部に、吸着剤４が配置される。そして、外包材３の内部を１Ｐａ～３Ｐａ程度の真空度に減圧し、その減圧状態で開口部をヒートシール等で融着して、外包材３の内部を減圧密封する。これにより、真空断熱材１が完成する。 After that, heat treatment is performed at 100° C. for about 2 hours in a state where the core material 20 is inserted inside the outer packaging material 3 formed in a bag shape. As a result, moisture is removed from the core material 20 and the outer packaging material 3. Next, the adsorbent 4 is placed inside the outer packaging material 3 formed in a bag shape. Then, the inside of the outer wrapping material 3 is depressurized to a vacuum degree of about 1 Pa to 3 Pa, and the opening portion is fused by heat sealing or the like in the depressurized state to hermetically seal the inside of the outer wrapping material 3 under reduced pressure. Thereby, the vacuum heat insulating material 1 is completed.
　なお、真空断熱材１が設けられる断熱箱の形状に沿わせる目的等で、減圧密封後の真空断熱材１の断熱面に、プレス型を用いて凹凸形状を形成する場合がある。この場合、第１面２３及び第２面２４のうちの第１芯材２１で構成されている面に、凹凸形状を形成するのが好ましい。プレス型と対向する範囲にショットが存在しないので、ショットによって外包材３に貫通孔が形成されることを防止でき、真空漏れ不良に至ることを抑制できる。 Note that, for the purpose of conforming to the shape of the heat insulating box in which the vacuum heat insulating material 1 is provided, an uneven shape may be formed using a press die on the heat insulating surface of the vacuum heat insulating material 1 after vacuum sealing. In this case, it is preferable to form an uneven shape on the surface of the first surface 23 and the second surface 24 that is configured by the first core member 21. Since there are no shots in the area facing the press die, it is possible to prevent the shots from forming through-holes in the outer packaging material 3 and suppress vacuum leakage defects.
　次に、本実施の形態１の真空断熱材１を実施例１～実施例９として作製し、比較例１及び比較例２との間で、芯材の密度、熱伝導率及び曲げ弾性率の比較を行った。表１及び表２にその比較結果を示し、以下にその比較結果について説明する。 Next, the vacuum heat insulating material 1 according to the first embodiment was produced as Examples 1 to 9, and the density, the thermal conductivity and the bending elastic modulus of the core material were different between Comparative Example 1 and Comparative Example 2. A comparison was made. The comparison results are shown in Tables 1 and 2, and the comparison results are described below.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　実施例１～実施例９に係る真空断熱材１では、芯材２０の第１芯材２１として、クロス質量が３２０ｇ／ｍ２のガラスチョップドストランドのニードルマットを用いている。当該ニードルマットは、真空断熱材１完成後の芯材２０の幅が０．５ｍとなり、真空断熱材１完成後の芯材２０の長さが２．０ｍとなるように切断され、第１芯材２１として用いられている。また、実施例１～実施例９に係る真空断熱材１では、芯材２０の第２芯材２２として、クロス質量が１２００ｇ／ｍ２のガラス短繊維を用いている。当該ガラス短繊維は、真空断熱材１完成後の芯材２０の幅が０．５ｍとなり、真空断熱材１完成後の芯材２０の長さが２．０ｍとなるように切断され、第２芯材２２として用いられている。なお、クロス質量（ｍａｓｓ　ｐｅｒ　ｕｎｉｔ　ａｒｅａ）とは、ガラスクロス１ｍ２当たりの重さである。 In the vacuum heat insulating materials 1 according to Examples 1 to 9, as the first core material 21 of the core material 20, a needle mat of glass chopped strands having a cloth mass of 320 g/m 2 is used. The needle mat is cut so that the width of the core material 20 after the completion of the vacuum heat insulating material 1 becomes 0.5 m and the length of the core material 20 after the completion of the vacuum heat insulating material 1 becomes 2.0 m. It is used as the material 21. Further, in the vacuum heat insulating materials 1 according to Examples 1 to 9, short glass fibers having a cross mass of 1200 g/m 2 are used as the second core material 22 of the core material 20. The short glass fiber is cut so that the width of the core material 20 after completion of the vacuum heat insulating material 1 becomes 0.5 m and the length of the core material 20 after completion of the vacuum heat insulating material 1 becomes 2.0 m. It is used as the core material 22. The cloth mass (mass per unit area) is the weight per 1 m 2 of glass cloth.
　実施例１～実施例９に係る真空断熱材１は、真空断熱材１完成後の芯材２０の厚さが５０ｍｍとなるように、第１芯材２１及び第２芯材２２が所定枚数ずつ重ねられ、芯材２０が形成されている。なお、第１芯材２１及び第２芯材２２の積層の仕方は、第１面２３及び第２面のうちの少なくとも一方が第１芯材２１で構成されていれば、特に限定されない。 In the vacuum heat insulating material 1 according to the first to ninth embodiments, a predetermined number of the first core material 21 and the second core material 22 are provided so that the thickness of the core material 20 after the vacuum heat insulating material 1 is completed is 50 mm. The core material 20 is formed by overlapping. The method of stacking the first core material 21 and the second core material 22 is not particularly limited as long as at least one of the first surface 23 and the second surface is composed of the first core material 21.
　また、実施例１～実施例９に係る真空断熱材１のそれぞれは、第１芯材２１及び第２芯材２２の枚数が異なっている。具体的には、実施例１に係る真空断熱材１の芯材２０は、５枚の第１芯材２１と９枚の第２芯材２２とが積層されている。芯材２０全体の質量は、１２４００ｇとなる。芯材２０全体の質量に対する第１芯材２１の質量の割合は、１２．９質量％となっている。すなわち、第１芯材２１の質量を芯材２０全体の質量で割った値に１００をかけた数値が、１２．９となっている。また、実施例２に係る真空断熱材１の芯材２０は、１０枚の第１芯材２１と８枚の第２芯材２２とが積層されている。芯材２０全体の質量は、１２８００ｇとなる。芯材２０全体の質量に対する第１芯材２１の質量の割合は、２５．０質量％となっている。また、実施例３に係る真空断熱材１の芯材２０は、１５枚の第１芯材２１と７枚の第２芯材２２とが積層されている。芯材２０全体の質量は、１３２００ｇとなる。芯材２０全体の質量に対する第１芯材２１の質量の割合は、３６．４質量％となっている。 Also, the vacuum heat insulating materials 1 according to Examples 1 to 9 are different in the number of the first core material 21 and the second core material 22. Specifically, in the core material 20 of the vacuum heat insulating material 1 according to the first embodiment, five first core materials 21 and nine second core materials 22 are laminated. The total mass of the core material 20 is 12400 g. The ratio of the mass of the first core material 21 to the mass of the whole core material 20 is 12.9 mass %. In other words, the value obtained by dividing the mass of the first core material 21 by the mass of the entire core material 20 by 100 is 12.9. Further, the core material 20 of the vacuum heat insulating material 1 according to the second embodiment is formed by stacking 10 first core materials 21 and 8 second core materials 22. The total mass of the core material 20 is 12,800 g. The ratio of the mass of the first core material 21 to the mass of the whole core material 20 is 25.0 mass %. Further, the core material 20 of the vacuum heat insulating material 1 according to the third embodiment has 15 first core materials 21 and 7 second core materials 22 laminated. The total mass of the core material 20 is 13200 g. The ratio of the mass of the first core material 21 to the mass of the whole core material 20 is 36.4 mass %.
　また、実施例４に係る真空断熱材１の芯材２０は、２０枚の第１芯材２１と６枚の第２芯材２２とが積層されている。芯材２０全体の質量は、１３６００ｇとなる。芯材２０全体の質量に対する第１芯材２１の質量の割合は、４７．１質量％となっている。また、実施例５に係る真空断熱材１の芯材２０は、２５枚の第１芯材２１と５枚の第２芯材２２とが積層されている。芯材２０全体の質量は、１４０００ｇとなる。芯材２０全体の質量に対する第１芯材２１の質量の割合は、５７．１質量％となっている。また、実施例６に係る真空断熱材１の芯材２０は、３０枚の第１芯材２１と４枚の第２芯材２２とが積層されている。芯材２０全体の質量は、１４４００ｇとなる。芯材２０全体の質量に対する第１芯材２１の質量の割合は、６６．７質量％となっている。 Further, the core material 20 of the vacuum heat insulating material 1 according to the fourth embodiment has 20 first core materials 21 and 6 second core materials 22 laminated. The total mass of the core material 20 is 13,600 g. The ratio of the mass of the first core material 21 to the mass of the entire core material 20 is 47.1 mass %. In addition, the core material 20 of the vacuum heat insulating material 1 according to the fifth embodiment has 25 first core materials 21 and 5 second core materials 22 laminated. The total mass of the core material 20 is 14000 g. The ratio of the mass of the first core material 21 to the mass of the entire core material 20 is 57.1 mass %. Further, the core material 20 of the vacuum heat insulating material 1 according to the sixth embodiment is formed by laminating 30 first core materials 21 and 4 second core materials 22. The total mass of the core material 20 is 14400 g. The ratio of the mass of the first core material 21 to the mass of the entire core material 20 is 66.7 mass %.
　また、実施例７に係る真空断熱材１の芯材２０は、３５枚の第１芯材２１と３枚の第２芯材２２とが積層されている。芯材２０全体の質量は、１４８００ｇとなる。芯材２０全体の質量に対する第１芯材２１の質量の割合は、７５．７質量％となっている。また、実施例８に係る真空断熱材１の芯材２０は、４０枚の第１芯材２１と２枚の第２芯材２２とが積層されている。芯材２０全体の質量は、１５２００ｇとなる。芯材２０全体の質量に対する第１芯材２１の質量の割合は、８４．２質量％となっている。また、実施例９に係る真空断熱材１の芯材２０は、４５枚の第１芯材２１と１枚の第２芯材２２とが積層されている。芯材２０全体の質量は、１５６００ｇとなる。芯材２０全体の質量に対する第１芯材２１の質量の割合は、９２．３質量％となっている。 Further, the core material 20 of the vacuum heat insulating material 1 according to the seventh embodiment is formed by stacking 35 first core materials 21 and three second core materials 22. The total mass of the core material 20 is 14800 g. The ratio of the mass of the first core material 21 to the mass of the entire core material 20 is 75.7 mass %. In addition, the core material 20 of the vacuum heat insulating material 1 according to the eighth embodiment includes 40 first core materials 21 and two second core materials 22 that are stacked. The total mass of the core material 20 is 15200 g. The ratio of the mass of the first core material 21 to the mass of the entire core material 20 is 84.2 mass %. Further, the core material 20 of the vacuum heat insulating material 1 according to the ninth embodiment is formed by stacking 45 first core materials 21 and one second core material 22. The total mass of the core material 20 is 15600 g. The ratio of the mass of the first core material 21 to the mass of the entire core material 20 is 92.3% by mass.
　また、実施例１～実施例９に係る真空断熱材１では、外包材３として、芯材２０側である内側から外側に向かって順にポリエチレン層、アルミ蒸着が施されたエチレン―ビニルアルコール層、アルミ蒸着が施されたポリエチレンテレフタレート層、及び、ナイロン層が積層されたラミネートフィルムを用いた。 Further, in the vacuum heat insulating materials 1 according to Examples 1 to 9, as the outer packaging material 3, a polyethylene layer, an ethylene-vinyl alcohol layer vapor-deposited with aluminum in this order from the inner side toward the outer side of the core material 20, A laminated film in which a polyethylene terephthalate layer vapor-deposited on aluminum and a nylon layer were laminated was used.
　そして、一部が開口した袋形状に形成された外包材３に上述のように構成された芯材２０を挿入し、１００℃で２時間加熱処理して、外包材３及び芯材２０から水分を除去した。次に、袋形状に形成された外包材３の内部に、５０ｇの酸化カルシウムで構成された吸着剤４を配置した。そして、外包材３の内部を１Ｐａの真空度に減圧し、その減圧状態で開口部をヒートシールで融着して、実施例１～実施例９に係る真空断熱材１を作製した。 Then, the core material 20 configured as described above is inserted into the outer packaging material 3 formed in the shape of a bag with a part opened, and heat treatment is performed at 100° C. for 2 hours to remove moisture from the outer packaging material 3 and the core material 20. Was removed. Next, the adsorbent 4 composed of 50 g of calcium oxide was placed inside the outer packaging material 3 formed in a bag shape. Then, the inside of the outer wrapping material 3 was depressurized to a vacuum degree of 1 Pa, and in the depressurized state, the openings were fused by heat sealing to produce vacuum heat insulating materials 1 according to Examples 1 to 9.
　比較例１に係る真空断熱材は、真空断熱材完成後の芯材の厚さが５０ｍｍとなるように、実施例１～実施例９に係る真空断熱材１で用いられた第１芯材２１のみを積層して、芯材が形成されている。すなわち、比較例１に係る真空断熱材は、ガラスチョップドストランドのみで芯材が形成されている。比較例１に係る真空断熱材のその他の作製方法は、実施例１～実施例９に係る真空断熱材１と同じである。比較例１に係る真空断熱材の芯材全体の質量は、１６０００ｇとなる。また、比較例１に係る真空断熱材は、芯材全体の質量に対する第１芯材２１の質量の割合が１００．０質量％となっている。 In the vacuum heat insulating material according to Comparative Example 1, the first core material 21 used in the vacuum heat insulating material 1 according to any of Examples 1 to 9 is formed so that the thickness of the core material after completion of the vacuum heat insulating material is 50 mm. The core material is formed by stacking only these. That is, in the vacuum heat insulating material according to Comparative Example 1, the core material is formed of only glass chopped strands. The other manufacturing methods of the vacuum heat insulating material according to Comparative Example 1 are the same as those of the vacuum heat insulating material 1 according to Examples 1 to 9. The mass of the whole core material of the vacuum heat insulating material according to Comparative Example 1 is 16000 g. Further, in the vacuum heat insulating material according to Comparative Example 1, the mass ratio of the first core material 21 to the mass of the entire core material is 100.0 mass %.
　また、比較例２に係る真空断熱材は、真空断熱材完成後の芯材の厚さが５０ｍｍとなるように、実施例１～実施例９に係る真空断熱材１で用いられた第２芯材２２のみを積層して、芯材が形成されている。すなわち、比較例２に係る真空断熱材は、ガラス短繊維のみで芯材が形成されている。比較例２に係る真空断熱材のその他の作製方法は、実施例１～実施例９に係る真空断熱材１と同じである。比較例２に係る真空断熱材の芯材全体の質量は、１２０００ｇとなる。また、比較例２に係る真空断熱材は、芯材全体の質量に対する第１芯材２１の質量の割合が０．０質量％となっている。 Further, the vacuum heat insulating material according to Comparative Example 2 is the second core used in the vacuum heat insulating material 1 according to Examples 1 to 9 so that the thickness of the core material after completion of the vacuum heat insulating material is 50 mm. A core material is formed by stacking only the material 22. That is, in the vacuum heat insulating material according to Comparative Example 2, the core material is formed of only glass short fibers. The other manufacturing method of the vacuum heat insulating material according to Comparative Example 2 is the same as that of the vacuum heat insulating material 1 according to Examples 1 to 9. The mass of the whole core material of the vacuum heat insulating material according to Comparative Example 2 is 12000 g. Further, in the vacuum heat insulating material according to Comparative Example 2, the ratio of the mass of the first core material 21 to the mass of the entire core material is 0.0 mass %.
　各実施例に係る真空断熱材１及び各比較例に係る真空断熱材の厚さ及び熱伝導率は、熱伝導率測定装置（英弘精機株式会社ＨＣ―０７４　６００）を用いて測定した。各実施例に係る真空断熱材１及び各比較例に係る真空断熱材の曲げ弾性率は、熱伝導率測定後、万能試験機を用いて、試験速度１０ｍｍ／分の三点曲げにより測定した。各実施例に係る真空断熱材１及び各比較例に係る真空断熱材の芯材の密度は、芯材全体の質量を真空断熱材の体積で除することにより算出した。 The thickness and thermal conductivity of the vacuum heat insulating material 1 according to each example and the vacuum heat insulating material according to each comparative example were measured by using a heat conductivity measuring device (HC-074 600, Eiko Seiki Co., Ltd.). The flexural modulus of the vacuum heat insulating material 1 according to each example and the vacuum heat insulating material according to each comparative example was measured by a three-point bending test speed of 10 mm/min using a universal testing machine after measuring the thermal conductivity. The density of the core material of the vacuum heat insulating material 1 according to each example and the vacuum heat insulating material according to each comparative example was calculated by dividing the mass of the whole core material by the volume of the vacuum heat insulating material.
　表１及び表２に示すように、実施例１～実施例９に係る真空断熱材１は、ガラスチョップドストランドのみで芯材が形成されている比較例１に係る真空断熱材と比べ、曲げ弾性率が大きい。また、実施例１～実施例９に係る真空断熱材１は、ガラスチョップドストランドのみで芯材が形成されている比較例１に係る真空断熱材と比べ、芯材の密度が小さい。すなわち、実施例１～実施例９に係る真空断熱材１は、ガラスチョップドストランドのみで芯材が形成されている比較例１に係る真空断熱材と比べ、軽い。したがって、実施例１～実施例９に係る真空断熱材１は、ガラスチョップドストランドのみで芯材が形成されている比較例１に係る真空断熱材と比べ、取り扱いが容易となる。また、表１及び表２に示すように、実施例１～実施例９に係る真空断熱材１は、ガラス短繊維のみで芯材が形成されている比較例２に係る真空断熱材と比べ、熱伝導率が小さい。このため、実施例１～実施例９に係る真空断熱材１は、ガラス短繊維のみで芯材が形成されている比較例２に係る真空断熱材と比べ、断熱性能が向上している。このように、実施例１～実施例９に係る真空断熱材１は、断熱性能が向上し、取り扱いも容易な真空断熱材となっている。 As shown in Tables 1 and 2, the vacuum heat insulating materials 1 according to Examples 1 to 9 have bending elasticity as compared with the vacuum heat insulating material according to Comparative Example 1 in which the core material is formed of only glass chopped strands. The rate is high. In addition, the vacuum heat insulating materials 1 according to Examples 1 to 9 have a lower density of the core material than the vacuum heat insulating material according to Comparative Example 1 in which the core material is formed of only glass chopped strands. That is, the vacuum heat insulating materials 1 according to Examples 1 to 9 are lighter than the vacuum heat insulating materials according to Comparative Example 1 in which the core material is formed of only glass chopped strands. Therefore, the vacuum heat insulating materials 1 according to Examples 1 to 9 are easier to handle than the vacuum heat insulating materials according to Comparative Example 1 in which the core material is formed of only glass chopped strands. Further, as shown in Table 1 and Table 2, the vacuum heat insulating material 1 according to Examples 1 to 9 has a higher heat insulating material than the vacuum heat insulating material according to Comparative Example 2 in which the core material is formed of only glass short fibers. Low thermal conductivity. Therefore, the vacuum heat insulating materials 1 according to Examples 1 to 9 have improved heat insulating performance as compared with the vacuum heat insulating material according to Comparative Example 2 in which the core material is formed of only glass short fibers. As described above, the vacuum heat insulating materials 1 according to Examples 1 to 9 are vacuum heat insulating materials having improved heat insulating performance and easy to handle.
　ここで、曲げ弾性率が５０ＭＰａを超えると、自重によって真空断熱材１が折れ曲がることを防止でき、真空断熱材１の取り扱いがより容易となる。このため、芯材２０全体の質量に対する第１芯材２１の質量の割合は、７５質量％以下であることが望ましい。芯材２０全体の質量に対する第１芯材２１の質量の割合をさらに低下させることによって、真空断熱材１の芯材２０の密度もさらに低下する。このため、芯材２０全体の質量に対する第１芯材２１の質量の割合をさらに低下させることによって、より軽量な真空断熱材１を得ることができ、真空断熱材１の取り扱いがさらに容易となる。翻って、芯材２０全体の質量に対する第１芯材２１の質量の割合を低下させていくにつれて、真空断熱材１の熱伝導率も低下していく。このため、真空断熱材１の断熱性能の向上という観点からは、芯材２０全体の質量に対する第１芯材２１の質量の割合は、２５質量％以上であることが望ましい。すなわち、真空断熱材１の断熱性能をより向上させ、真空断熱材１の取り扱いをより容易にしようとした場合、芯材２０全体の質量に対する第１芯材２１の質量の割合は、２５質量％以上であり７５質量％以下であることが望ましい。また、真空断熱材１の断熱性能をさらに向上させ、真空断熱材１の取り扱いをさらに容易にしようとした場合、芯材２０全体の質量に対する第１芯材２１の質量の割合は、３６質量％以上であり６７質量％以下であることが望ましい。 Here, if the flexural modulus exceeds 50 MPa, the vacuum heat insulating material 1 can be prevented from bending due to its own weight, and the vacuum heat insulating material 1 can be handled more easily. Therefore, the ratio of the mass of the first core material 21 to the mass of the entire core material 20 is preferably 75 mass% or less. By further reducing the ratio of the mass of the first core material 21 to the mass of the entire core material 20, the density of the core material 20 of the vacuum heat insulating material 1 further decreases. Therefore, by further reducing the ratio of the mass of the first core material 21 to the mass of the core material 20 as a whole, a lighter vacuum heat insulating material 1 can be obtained, and the vacuum heat insulating material 1 becomes easier to handle. .. On the contrary, as the ratio of the mass of the first core material 21 to the mass of the entire core material 20 is decreased, the thermal conductivity of the vacuum heat insulating material 1 also decreases. Therefore, from the viewpoint of improving the heat insulating performance of the vacuum heat insulating material 1, the ratio of the mass of the first core material 21 to the mass of the whole core material 20 is preferably 25 mass% or more. That is, when the heat insulation performance of the vacuum heat insulating material 1 is further improved and the vacuum heat insulating material 1 is handled more easily, the ratio of the mass of the first core material 21 to the mass of the whole core material 20 is 25 mass %. It is above, and it is desirable that it is 75 mass% or less. When the heat insulation performance of the vacuum heat insulating material 1 is further improved and the vacuum heat insulating material 1 is handled more easily, the mass ratio of the first core material 21 to the mass of the whole core material 20 is 36 mass %. It is above, and it is desirable that it is 67 mass% or less.
　次に、本実施の形態１の真空断熱材１を実施例１０及び実施例１１として作製し、比較例３との間で、真空漏れの発生率の比較を行った。表３にその比較結果を示し、以下にその比較結果について説明する。 Next, the vacuum heat insulating material 1 of the first embodiment was manufactured as Example 10 and Example 11, and the occurrence rate of vacuum leakage was compared with Comparative Example 3. The comparison result is shown in Table 3, and the comparison result will be described below.
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000003
　実施例１０に係る真空断熱材１の芯材２０は、真空断熱材１完成後の芯材２０の厚さが５０ｍｍとなるように、実施例１～実施例９に係る真空断熱材１で用いられた第２芯材２２を６枚積層し、第２芯材２２の一方の側に実施例１～実施例９に係る真空断熱材１で用いられた第１芯材２１を２０枚積層して形成した。実施例１０に係る真空断熱材１のその他の作製方法は、実施例１～実施例９に係る真空断熱材１と同じである。すなわち、実施例１０に係る真空断熱材１の芯材２０は、第１面２３又は第２面２４がガラスチョップドストランドのニードルマットである第１芯材２１で構成されている。 The core material 20 of the vacuum heat insulating material 1 according to the tenth embodiment is used in the vacuum heat insulating material 1 according to the first to ninth embodiments so that the thickness of the core material 20 after the completion of the vacuum heat insulating material 1 is 50 mm. 6 sheets of the second core material 22 thus obtained are laminated, and 20 sheets of the first core material 21 used in the vacuum heat insulating material 1 according to the examples 1 to 9 are laminated on one side of the second core material 22. Formed. The other manufacturing method of the vacuum heat insulating material 1 according to the tenth embodiment is the same as that of the vacuum heat insulating material 1 according to the first to ninth embodiments. That is, in the core material 20 of the vacuum heat insulating material 1 according to Example 10, the first surface 23 or the second surface 24 is composed of the first core material 21 which is a needle mat of glass chopped strands.
　実施例１１に係る真空断熱材１の芯材２０は、真空断熱材１完成後の芯材２０の厚さが５０ｍｍとなるように、実施例１～実施例９に係る真空断熱材１で用いられた第２芯材２２を６枚積層し、第２芯材２２の一方の側に実施例１～実施例９に係る真空断熱材１で用いられた第１芯材２１を１０枚積層し、第２芯材２２の他方の側に実施例１～実施例９に係る真空断熱材１で用いられた第１芯材２１を１０枚積層して形成した。実施例１１に係る真空断熱材１のその他の作製方法は、実施例１～実施例９に係る真空断熱材１と同じである。すなわち、実施例１１に係る真空断熱材１の芯材２０は、第１面２３及び第２面２４の両面がガラスチョップドストランドのニードルマットである第１芯材２１で構成されている。 The core material 20 of the vacuum heat insulating material 1 according to the eleventh embodiment is used in the vacuum heat insulating material 1 according to the first to ninth embodiments so that the thickness of the core material 20 after the completion of the vacuum heat insulating material 1 is 50 mm. 6 sheets of the second core material 22 thus obtained are laminated, and 10 sheets of the first core material 21 used in the vacuum heat insulating material 1 according to the examples 1 to 9 are laminated on one side of the second core material 22. On the other side of the second core material 22, ten first core materials 21 used in the vacuum heat insulating material 1 according to Examples 1 to 9 were laminated. Other manufacturing methods of the vacuum heat insulating material 1 according to the eleventh embodiment are the same as those of the vacuum heat insulating material 1 according to the first to ninth embodiments. That is, in the core material 20 of the vacuum heat insulating material 1 according to Example 11, both the first surface 23 and the second surface 24 are composed of the first core material 21 which is a needle mat of glass chopped strands.
　比較例３に係る真空断熱材の芯材は、真空断熱材完成後の芯材の厚さが５０ｍｍとなるように、実施例１～実施例９に係る真空断熱材１で用いられた第２芯材２２を１０枚積層して形成した。比較例３に係る真空断熱材のその他の作製方法は、実施例１～実施例９に係る真空断熱材１と同じである。すなわち、比較例３に係る真空断熱材の芯材は、ガラス短繊維のみで構成されている。 The core material of the vacuum heat insulating material according to Comparative Example 3 was used in the vacuum heat insulating material 1 according to Examples 1 to 9 so that the thickness of the core material after completion of the vacuum heat insulating material was 50 mm. The core material 22 was formed by laminating 10 sheets. Other manufacturing methods of the vacuum heat insulating material according to Comparative Example 3 are the same as those of the vacuum heat insulating material 1 according to Examples 1 to 9. That is, the core material of the vacuum heat insulating material according to Comparative Example 3 was composed of only glass short fibers.
　実施例１０，１１に係る真空断熱材１及び比較例３に係る真空断熱材のそれぞれを１０００枚作製し、室温環境下で４８時間放置した。その後に、実施例１０，１１に係る真空断熱材１及び比較例３に係る真空断熱材のそれぞれについて真空漏れの発生枚数を計測し、真空漏れの発生率を算出した。 1000 sheets of each of the vacuum heat insulating material 1 according to Examples 10 and 11 and the vacuum heat insulating material according to Comparative Example 3 were prepared and left to stand in a room temperature environment for 48 hours. After that, the number of occurrences of vacuum leakage was measured for each of the vacuum heat insulating material 1 according to Examples 10 and 11 and the vacuum heat insulating material according to Comparative Example 3, and the occurrence rate of vacuum leakage was calculated.
　表２に示すように、ガラス短繊維のみで芯材が形成されている比較例３に係る真空断熱材は、真空漏れ不良の発生率が５．１％であった。一方、芯材２０の第１面２３又は第２面２４がガラスチョップドストランドのニードルマットである第１芯材２１で構成されている実施例１０に係る真空断熱材１は、真空漏れ不良の発生率が２．２％に低減している。また、芯材２０の第１面２３及び第２面２４の両面がガラスチョップドストランドのニードルマットである第１芯材２１で構成されている実施例１１に係る真空断熱材１は、真空漏れ不良の発生率がさらに低減し、真空漏れ不良の発生率が０．２％となっている。このように、本実施の形態１に係る真空断熱材１は、ガラス短繊維のみで形成された芯材を用いた真空断熱材に比べ、真空漏れ不良に至ることを抑制できる。 As shown in Table 2, in the vacuum heat insulating material according to Comparative Example 3 in which the core material was formed of only glass short fibers, the occurrence rate of defective vacuum leakage was 5.1%. On the other hand, in the vacuum heat insulating material 1 according to Example 10 in which the first surface 23 or the second surface 24 of the core material 20 is constituted by the first core material 21 which is the needle mat of glass chopped strands, the vacuum leakage defect occurs. The rate is reduced to 2.2%. Further, the vacuum heat insulating material 1 according to the example 11 in which both the first surface 23 and the second surface 24 of the core material 20 are composed of the first core material 21 which is the needle mat of the glass chopped strand, has a poor vacuum leakage. Is further reduced, and the rate of occurrence of vacuum leakage failure is 0.2%. As described above, the vacuum heat insulating material 1 according to the first embodiment can suppress the occurrence of defective vacuum leakage, as compared with the vacuum heat insulating material using the core material formed of only the glass short fibers.
　なお、真空漏れ不良の原因となる、ガラス短繊維に含まれるショットの概形は、数十μｍから数百μｍである。一方、実施例１～実施例１１で用いた第１芯材２１は、真空断熱材１完成後の厚さが約１ｍｍとなる。このため、ショットによって外包材３に貫通孔が形成されることによって起きる真空漏れ不良を抑制するためには、ガラス短繊維で形成された第２芯材２２の外側に、少なくとも１枚の第１芯材２１を設ければよい。換言すると、ショットによって外包材３に貫通孔が形成されることによって起きる真空漏れ不良を抑制するためには、ガラス短繊維で形成された第２芯材２２の外側に、第１芯材２１を少なくとも厚さ約１ｍｍ設ければよい。 Note that the shape of shots contained in short glass fibers, which causes vacuum leakage defects, is from several tens of micrometers to several hundreds of micrometers. On the other hand, the first core material 21 used in Examples 1 to 11 has a thickness of about 1 mm after the vacuum heat insulating material 1 is completed. Therefore, in order to suppress the vacuum leakage failure caused by the through holes being formed in the outer packaging material 3 by the shot, at least one first core material 22 is formed outside the second core material 22 formed of short glass fibers. The core material 21 may be provided. In other words, in order to suppress the vacuum leakage failure caused by the through hole being formed in the outer packaging material 3 by the shot, the first core material 21 is provided outside the second core material 22 formed of short glass fibers. The thickness may be at least about 1 mm.
　以上、本実施の形態１に係る真空断熱材１は、芯材２０と、芯材２０を包む外包材３とを備え、外包材３で覆われた内部空間が減圧状態となっている板状の真空断熱材である。また、芯材２０は、ガラスチョップドストランドのニードルマットである第１芯材２１と、ガラス短繊維で形成された第２芯材２２とを備え、第１芯材２１と第２芯材２２とが真空断熱材１の厚み方向に積層された構成となっている。そして、本実施の形態１に係る真空断熱材１においては、外包材３と真空断熱材１の厚み方向に対向して該外包材３と接する芯材２０の２面のうちの少なくとも１面は、第１芯材２１で構成されている。 As described above, the vacuum heat insulating material 1 according to the first embodiment includes the core material 20 and the outer packaging material 3 that wraps the core material 20, and the internal space covered with the outer packaging material 3 is in a depressurized state. It is a vacuum insulation material. Further, the core material 20 includes a first core material 21 which is a needle mat of glass chopped strands, and a second core material 22 formed of short glass fibers, and the first core material 21 and the second core material 22. Are laminated in the thickness direction of the vacuum heat insulating material 1. In the vacuum heat insulating material 1 according to the first embodiment, at least one of the two surfaces of the core material 20 facing the outer packaging material 3 in the thickness direction of the vacuum heat insulating material 1 and in contact with the outer packaging material 3 is , The first core member 21.
　本実施の形態１に係る真空断熱材１においては、外包材３と真空断熱材１の厚み方向に対向して該外包材３と接する芯材２０の２面のうちの少なくとも１面が、ガラスチョップドストランドのニードルマットである第１芯材２１となっている。このため、本実施の形態１に係る真空断熱材１は、ガラス短繊維で形成された芯材を用いた従来の真空断熱材に比べ、外包材３に形成された貫通孔によって真空漏れ不良に至ることを抑制できる。 In the vacuum heat insulating material 1 according to the first embodiment, at least one of the two surfaces of the outer packaging material 3 and the core material 20 facing the thickness direction of the vacuum heat insulating material 1 and in contact with the outer packaging material 3 is glass. It is the first core material 21 which is a needle mat of chopped strands. Therefore, the vacuum heat insulating material 1 according to the first embodiment is less likely to cause a vacuum leak defect due to the through hole formed in the outer packaging material 3 as compared with the conventional vacuum heat insulating material using the core material formed of short glass fibers. It can be suppressed.
　また、本実施の形態１に係る真空断熱材１の芯材２０は、ガラスチョップドストランドのニードルマットである第１芯材２１とガラス短繊維で形成された第２芯材２２とが積層されて構成されている。このため、本実施の形態１に係る真空断熱材１は、芯材としてガラスチョップドストランドを用いた従来の真空断熱材と比べ、剛性が向上し、質量も軽くなる。また、本実施の形態１に係る真空断熱材１の芯材２０は、結合剤を用いなくとも製造することができる。したがって、本実施の形態１に係る真空断熱材１は、結合剤を用いなくとも、芯材としてガラスチョップドストランドを用いた従来の真空断熱材と比べ、取り扱いが容易となる。 Further, the core material 20 of the vacuum heat insulating material 1 according to the first embodiment is formed by laminating the first core material 21 which is a needle mat of glass chopped strands and the second core material 22 formed of glass short fibers. It is configured. Therefore, the vacuum heat insulating material 1 according to the first embodiment has improved rigidity and lighter mass as compared with the conventional vacuum heat insulating material using glass chopped strands as the core material. Moreover, the core material 20 of the vacuum heat insulating material 1 according to the first embodiment can be manufactured without using a binder. Therefore, the vacuum heat insulating material 1 according to the first embodiment is easier to handle than a conventional vacuum heat insulating material using glass chopped strands as a core material, even without using a binder.
実施の形態２．
　本実施の形態２では、実施の形態１に係る真空断熱材１を備えた断熱箱の一例について説明する。なお、本実施の形態２において、特に記述しない項目については実施の形態１と同様とし、同一の機能及び構成については同一の符号を用いて述べることとする。 Embodiment 2.
In the second embodiment, an example of a heat insulating box provided with the vacuum heat insulating material 1 according to the first embodiment will be described. In the second embodiment, items that are not particularly described are the same as those in the first embodiment, and the same functions and configurations are described using the same reference numerals.
　図３は、本発明の実施の形態２に係る断熱箱の概略構成を示す断面図である。断熱箱１００は、例えば、高い断熱性能が求められる冷蔵庫等に用いられる。
　図３に示すように、断熱箱１００は、外箱１２０と、該外箱１２０の内部に配置された内箱１１０とを備えている。そして、内箱１１０と外箱１２０との間には、実施の形態１において説明した真空断熱材１が配置されており、内箱１１０と外箱１２０の間で断熱を行う。 FIG. 3 is a sectional view showing a schematic configuration of a heat insulation box according to Embodiment 2 of the present invention. The heat insulation box 100 is used, for example, in a refrigerator or the like that requires high heat insulation performance.
As shown in FIG. 3, the heat insulation box 100 includes an outer box 120 and an inner box 110 arranged inside the outer box 120. Then, the vacuum heat insulating material 1 described in the first embodiment is arranged between the inner case 110 and the outer case 120, and the inner case 110 and the outer case 120 are thermally insulated.
　真空断熱材１が配置される位置は、内箱１１０と外箱１２０との間で断熱できる位置であれば、特に限定されない。例えば、内箱１１０における外箱１２０と対向する面に接するように、真空断熱材１を配置してもよい。また例えば、外箱１２０における内箱１１０と対向する面に接するように、真空断熱材１を配置してもよい。また例えば、内箱１１０又は外箱１２０と真空断熱材１との間にスペーサ等を設け、内箱１１０及び外箱１２０と真空断熱材１とが接触しないように、内箱１１０と外箱１２０との間の空間に真空断熱材を配置してもよい。 The position where the vacuum heat insulating material 1 is arranged is not particularly limited as long as it is a position where heat can be insulated between the inner box 110 and the outer box 120. For example, the vacuum heat insulating material 1 may be arranged so as to come into contact with the surface of the inner box 110 facing the outer box 120. Further, for example, the vacuum heat insulating material 1 may be arranged so as to come into contact with the surface of the outer box 120 facing the inner box 110. Further, for example, a spacer or the like is provided between the inner box 110 or the outer box 120 and the vacuum heat insulating material 1 so that the inner box 110 and the outer box 120 do not come into contact with the vacuum heat insulating material 1. You may arrange|position a vacuum heat insulating material in the space between and.
　ここで、真空断熱材１は、発泡ウレタン断熱材１３０等と比較して高い断熱性能を有する。このため、真空断熱材１を備えた断熱箱１００は、発泡ウレタン断熱材１３０のみを用いた断熱箱よりも高い断熱性能を得られる。しかし、内箱１１０と外箱１２０との間の空間のうち、真空断熱材１以外の部分には発泡ウレタン断熱材１３０が充填されていてもよい。 Here, the vacuum heat insulating material 1 has higher heat insulating performance than the urethane foam heat insulating material 130 and the like. Therefore, the heat insulating box 100 provided with the vacuum heat insulating material 1 can obtain higher heat insulating performance than the heat insulating box using only the urethane foam heat insulating material 130. However, in the space between the inner box 110 and the outer box 120, a portion other than the vacuum heat insulating material 1 may be filled with the urethane foam heat insulating material 130.
　なお、上記の説明において、一般的な冷蔵庫等に用いられている断熱箱と同等である部分については、図示及び説明を省略している。 Note that, in the above description, illustration and description of parts that are equivalent to the heat insulation boxes used in general refrigerators are omitted.
　以上、本実施の形態２に係る断熱箱１００は、芯材としてガラスチョップドストランドを用いた従来の真空断熱材よりも軽量な真空断熱材１が設けられている。このため、本実施の形態２に係る断熱箱１００は、芯材としてガラスチョップドストランドを用いた従来の真空断熱材が用いられている断熱箱と比べ、軽量化することができる。また、本実施の形態２に係る断熱箱１００は、ガラス短繊維で形成された芯材を用いた従来の真空断熱材よりも真空漏れ不良を抑制できる真空断熱材１が設けられている。このため、本実施の形態２に係る断熱箱１００は、ガラス短繊維で形成された芯材を用いた従来の真空断熱材が用いられている断熱箱と比べ、断熱箱１００を製造する際の歩留まりが向上する。 As described above, the heat insulating box 100 according to the second embodiment is provided with the vacuum heat insulating material 1 which is lighter in weight than the conventional vacuum heat insulating material using glass chopped strands as the core material. Therefore, the heat insulation box 100 according to the second embodiment can be made lighter in weight than a heat insulation box using a conventional vacuum heat insulation material using glass chopped strands as a core material. Further, the heat insulating box 100 according to the second embodiment is provided with the vacuum heat insulating material 1 capable of suppressing defective vacuum leakage more than the conventional vacuum heat insulating material using the core material formed of glass short fibers. Therefore, the heat insulating box 100 according to the second embodiment is different from the heat insulating box in which the conventional vacuum heat insulating material using the core material formed of the glass short fibers is used in manufacturing the heat insulating box 100. Yield is improved.
　なお、本実施の形態２では、冷熱源を備える冷蔵庫の断熱箱１００に真空断熱材１が用いられた構成を例に挙げたが、本発明はこれに限られない。例えば、真空断熱材１は、温熱源を備える保温庫の断熱箱に用いることもできる。また例えば、真空断熱材１は、冷熱源及び温熱源を備えない断熱箱、例えば、クーラーボックス等に用いることもできる。また、真空断熱材１は、断熱箱だけでなく、空調機、車両用空調機及び給湯機等の冷熱機器又は温熱機器の断熱部材として用いてもよい。また、断熱容器等に真空断熱材１を用いてもよい。また、真空断熱材１の形状も上記の平板形状に限定されるものではない。例えば、図１において上側又は下側に凸となるような曲面形状に、真空断熱材１を形成してもよい。また例えば、変形自在な外袋及び内袋を備えた断熱袋に真空断熱材１を用いてもよい。 In the second embodiment, the structure in which the vacuum heat insulating material 1 is used in the heat insulating box 100 of the refrigerator including the cold heat source is taken as an example, but the present invention is not limited to this. For example, the vacuum heat insulating material 1 can also be used for a heat insulating box of a heat storage box provided with a heat source. Further, for example, the vacuum heat insulating material 1 can also be used for a heat insulating box that does not include a cold heat source and a warm heat source, such as a cooler box. Further, the vacuum heat insulating material 1 may be used not only as a heat insulating box but also as a heat insulating member for a cooling or heating device such as an air conditioner, a vehicle air conditioner, and a water heater. Further, the vacuum heat insulating material 1 may be used for a heat insulating container or the like. The shape of the vacuum heat insulating material 1 is not limited to the flat plate shape described above. For example, the vacuum heat insulating material 1 may be formed in a curved surface shape that is convex upward or downward in FIG. Further, for example, the vacuum heat insulating material 1 may be used for a heat insulating bag having a deformable outer bag and an inner bag.
　１　真空断熱材、３　外包材、４　吸着剤、２０　芯材、２１　第１芯材、２２　第２芯材、２３　第１面、２４　第２面、１００　断熱箱、１１０　内箱、１２０　外箱、１３０　発泡ウレタン断熱材。 1 vacuum insulation material, 3 outer packaging material, 4 adsorbent, 20 core material, 21 first core material, 22 second core material, 23 first surface, 24 second surface, 100 heat insulation box, 110 inner box, 120 outer box , 130 Foam urethane insulation.

Claims (5)

  1. 　芯材と、前記芯材を包む外包材とを備え、前記外包材で覆われた内部空間が減圧状態となっている板状の真空断熱材であって、
    　前記芯材は、
    　ガラスチョップドストランドのニードルマットである第１芯材と、ガラス短繊維で形成された第２芯材とを備え、
    　前記第１芯材と前記第２芯材とが当該真空断熱材の厚み方向に積層された構成であり、
    　前記外包材と前記厚み方向に対向して該外包材と接する前記芯材の２面のうちの少なくとも１面は、前記第１芯材で構成されている真空断熱材。     A plate-shaped vacuum heat insulating material comprising a core material and an outer packaging material that wraps the core material, wherein the internal space covered with the outer packaging material is in a reduced pressure state
    The core material is
    A first core material, which is a needle mat of glass chopped strands, and a second core material formed of short glass fibers,
    A configuration in which the first core material and the second core material are laminated in the thickness direction of the vacuum heat insulating material,
    The vacuum heat insulating material, wherein at least one of the two surfaces of the core material facing the outer packaging material in the thickness direction and in contact with the outer packaging material is composed of the first core material.
  2. 　前記外包材と前記厚み方向に対向して該外包材と接する前記芯材の前記２面の両面が、前記第１芯材で構成されている請求項１に記載の真空断熱材。 The vacuum heat insulating material according to claim 1, wherein both of the two surfaces of the core material facing the outer packaging material in the thickness direction and in contact with the outer packaging material are composed of the first core material.
  3. 　前記芯材全体の質量に対する前記第１芯材の質量の割合が、２５質量％以上であり７５質量％以下である請求項１又は請求項２に記載の真空断熱材。 The vacuum heat insulating material according to claim 1 or 2, wherein the ratio of the mass of the first core material to the mass of the entire core material is 25% by mass or more and 75% by mass or less.
  4. 　前記第１芯材に結合剤が用いられていない請求項１～請求項３のいずれか一項に記載の真空断熱材。 The vacuum heat insulating material according to any one of claims 1 to 3, wherein a binder is not used in the first core material.
  5. 　外箱と、
    　前記外箱の内部に配置された内箱と、
    　前記外箱と前記内箱との間に配置された請求項１～請求項４のいずれか一項に記載の真空断熱材と、
    　を備えた断熱箱。     Outer box,
    An inner box arranged inside the outer box,
    The vacuum heat insulating material according to any one of claims 1 to 4, which is disposed between the outer box and the inner box.
    Insulation box equipped with.
PCT/JP2019/002496 2019-01-25 2019-01-25 Vacuum heat insulation material and heat insulation box WO2020152854A1 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002310384A (en) * 2001-04-11 2002-10-23 Matsushita Refrig Co Ltd Vacuum heat insulation material, refrigerating appliance with vacuum heat insulation material, electric water heater, and oven-range
JP2010060048A (en) * 2008-09-03 2010-03-18 Panasonic Corp Vacuum heat insulating core material, vacuum heat insulating material using the same, and method of manufacturing the vacuum heat insulating core maerial
KR20130078005A (en) * 2011-12-30 2013-07-10 제일모직주식회사 Core for vacuum insulation panel with excellent heat insulation property and pinhole resistance
JP2015137688A (en) * 2014-01-21 2015-07-30 日本グラスファイバー工業株式会社 Vacuum insulation material and process for manufacture of vacuum insulation material
WO2017195329A1 (en) * 2016-05-12 2017-11-16 三菱電機株式会社 Vacuum heat-insulating material and manufacturing method therefor
WO2018047261A1 (en) * 2016-09-08 2018-03-15 三菱電機株式会社 Vacuum insulation material and insulation box
WO2018087983A1 (en) * 2016-11-10 2018-05-17 三菱電機株式会社 Vacuum thermal insulating material, method for producing vacuum thermal insulating material, and apparatus for producing vacuum thermal insulating material

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002310384A (en) * 2001-04-11 2002-10-23 Matsushita Refrig Co Ltd Vacuum heat insulation material, refrigerating appliance with vacuum heat insulation material, electric water heater, and oven-range
JP2010060048A (en) * 2008-09-03 2010-03-18 Panasonic Corp Vacuum heat insulating core material, vacuum heat insulating material using the same, and method of manufacturing the vacuum heat insulating core maerial
KR20130078005A (en) * 2011-12-30 2013-07-10 제일모직주식회사 Core for vacuum insulation panel with excellent heat insulation property and pinhole resistance
JP2015137688A (en) * 2014-01-21 2015-07-30 日本グラスファイバー工業株式会社 Vacuum insulation material and process for manufacture of vacuum insulation material
WO2017195329A1 (en) * 2016-05-12 2017-11-16 三菱電機株式会社 Vacuum heat-insulating material and manufacturing method therefor
WO2018047261A1 (en) * 2016-09-08 2018-03-15 三菱電機株式会社 Vacuum insulation material and insulation box
WO2018087983A1 (en) * 2016-11-10 2018-05-17 三菱電機株式会社 Vacuum thermal insulating material, method for producing vacuum thermal insulating material, and apparatus for producing vacuum thermal insulating material

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