JP2014077478A - Vacuum heat insulation material and heat insulation box comprising the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an outer packaging material from being scratched, while maintaining thermal insulation performance.SOLUTION: A core material 3 made of inorganic fibers is housed within a gas-barrier outer packaging material 2; a nonwoven fabric 4 made of organic fibers is provided between the core material 3 and the outer packaging material 2; and the outer packaging material 2 is brought into a decompressed state and sealed. The nonwoven fabric 4 made of the organic fibers prevents the outer packaging material 2 from being scratched by the core material 3. Additionally, a void is secured by the nonwoven fabric 4 made of the organic fibers; a deterioration in heat conductivity is prevented; and thermal insulation performance is maintained.

Description

  The present invention relates to a vacuum heat insulating material and a heat insulating box provided with the vacuum heat insulating material, and more particularly to a vacuum heat insulating material suitable for use in a refrigeration apparatus and a heat insulating box provided with the vacuum heat insulating material.

  Conventionally, urethane has been used as a heat insulating material, but in recent years, vacuum heat insulating materials having better heat insulating performance than urethane have been used in combination with urethane. Such a vacuum heat insulating material is used not only for a refrigerator but also for a cooling device such as a heat insulation box, a vehicle air conditioner, and a water heater.

  The vacuum insulation material is a powder, foam, fiber, etc. inserted into the outer packaging material made of gas barrier (air barrier) aluminum foil, and the inside is kept at a degree of vacuum of several Pa. It is what.

  As a conventional vacuum heat insulating material used as a heat insulating material for a heat insulating box such as a refrigerator, there is one in which an inner packaging material using an inorganic fiber as a core material is accommodated in an outer packaging material in a reduced pressure state. In addition, as a conventional vacuum heat insulating material, an organic coating layer or film layer is provided between the core material and the outer packaging material, and the organic coating layer or film layer prevents the core material from scratching the outer packaging material. (For example, refer to Patent Document 1).

Japanese Patent Laying-Open No. 2005-106306 (Summary, FIG. 3)

  However, in the case where the core material prevents the outer packaging material from being damaged by the organic coating layer or the film layer, the presence of the coating layer or the film layer eliminates the void, and the thermal conductivity is deteriorated. There were difficulties.

  The present invention has been made to solve the above-described problems, and an object thereof is to prevent the outer packaging material from being damaged while maintaining the heat insulation performance.

  A vacuum heat insulating material according to the present invention is a vacuum heat insulating material that contains a core material composed of inorganic fibers inside a gas barrier outer packaging material and is sealed in a reduced pressure state. The core material, the outer packaging material, An organic fiber non-woven fabric is provided between them.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent that a core material damages an outer packaging material with the nonwoven fabric of the organic fiber provided between the core material and the outer packaging material. Moreover, since a space | gap can be ensured with the nonwoven fabric of an organic fiber, deterioration of heat conductivity can be prevented and heat insulation performance can be maintained.

1 is an exploded perspective view of a vacuum heat insulating material according to Embodiment 1. FIG. It is a perspective view which shows the state which has arrange | positioned the nonwoven fabric of an organic fiber around the core material of the vacuum heat insulating material which concerns on Embodiment 1. FIG. It is sectional drawing which shows typically the heat insulation box (refrigerator) which concerns on Embodiment 2. FIG.

Embodiment 1. FIG.
FIG. 1 is an exploded perspective view of the vacuum heat insulating material according to the first embodiment. FIG. 2 is a perspective view showing a state in which an organic fiber non-woven fabric is arranged around the core of the vacuum heat insulating material according to the first embodiment.
As shown in FIGS. 1 and 2, the vacuum heat insulating material 1 according to Embodiment 1 includes a gas barrier outer packaging material 2 having an air barrier property, a core material 3 of inorganic fibers enclosed in the outer packaging material 2, and a core material 3. And the non-woven fabric 4 of organic fiber provided around the core material 3. The inside of the outer packaging material 2 is depressurized to 1 Pa to 3 Pa.

  The outer packaging material 2 of the vacuum heat insulating material 1 is drawn nylon (thickness 25 μm), aluminum vapor-deposited PET (polyethylene terephthalate) (thickness 12 μm), aluminum vapor-deposited EVOH (ethylene vinyl alcohol resin) (thickness 12 μm), low-density linear It is comprised with the plastic laminate film with a gas barrier property comprised with the shape polyethylene (50 micrometers in thickness).

  The inorganic fiber core material 3 enclosed in the outer packaging material 2 is made of dry glass having an average fiber diameter of 4 μm.

The organic fiber non-woven fabric 4 provided around the core material 3 is composed of polyethylene terephthalate fibers (weight per unit area: 17.5 (g / m ² ), average fiber diameter: 13 μm) formed into continuous fibers by the spunbond method. One sheet is arranged on each side of the core material 3. These organic fiber non-woven fabrics 4 were all 280 × 355 mm in size, and were able to wrap the core material 3 when the outer packaging material 2 was evacuated. In addition, as a material of the nonwoven fabric 4 of organic fiber, another organic fiber, for example, a polypropylene, a polystyrene, and a polylactic acid fiber, may be sufficient.

  The vacuum heat insulating material 1 having the above configuration is manufactured by the following process. First, the outer packaging material 2 heat-seals three of the four sides with a seal wrapping machine. Next, the dried core material 3 is inserted into the outer packaging material 2 which is a bag. Next, an organic fiber non-woven fabric 4 is inserted around the core material 3, that is, between the core material 3 and the outer packaging material 2, the core material 3 is sandwiched between the non-woven fabric 4, and the remaining one side is evacuated. To seal. The organic fiber non-woven fabric 4 may be made into a bag shape and a glass core material may be put therein, or the organic fiber non-woven fabric 4 may be used to wrap the glass core material.

  The vacuum heat insulating material 1 manufactured in this way had a thermal conductivity of 0.0021 (W / mK). The thermal conductivity of the vacuum heat insulating material 1 is measured on the next day after the vacuum heat insulating material 1 is manufactured using HC07 / 304 manufactured by EKO. Further, the vacuum heat insulating material 1 was able to prevent the core material from scratching the outer packaging material by the organic fiber nonwoven fabric 4 provided around the core material 3.

Comparative Example 1
As Comparative Example 1, a dry glass having an average fiber diameter of 4 μm was used as a core material, a vacuum heat insulating material was produced in the same manner as in Embodiment 1, and the thermal conductivity was measured. In this comparative example 1, nothing is provided between the core material and the outer packaging material.
The vacuum heat insulating material of Comparative Example 1 has a thermal conductivity of 0.0021 (W / mK), which is the same as that of the vacuum heat insulating material 1 of Embodiment 1, but the core material is an outer envelope. It was not possible to prevent the material from being scratched, and the reliability was inferior to that of the vacuum heat insulating material 1 of the first embodiment.

Comparative Example 2
As Comparative Example 2, using a dry glass having an average fiber diameter of 4 μm whose surface was coated with an organic material layer as a core material, a vacuum heat insulating material was produced in the same manner as in Embodiment 1, and the thermal conductivity was measured. In Comparative Example 2, a 0.1% aqueous solution of PVA (polyvinyl alcohol) was used as the coating agent.
The vacuum heat insulating material of Comparative Example 2 can prevent the core material from scratching the outer packaging material by the coating layer on the surface of the core material, but has a thermal conductivity of 0.0022 (W / mK). It was inferior in the point of thermal conductivity compared with the thing of 1 vacuum heat insulating material 1.

Comparative Example 3
As Comparative Example 3, a dry glass having an average fiber diameter of 4 μm was used as a core material, and a LL-DPE (linear low-density polyethylene) film having a thickness of 30 μm was disposed on both sides of the core material. A material was prepared and the thermal conductivity was measured.
The vacuum heat insulating material of Comparative Example 3 can prevent the core material from scratching the outer packaging material by the LL-DPE film disposed on both sides of the core material, but the thermal conductivity is 0.0022 (W / mK). Yes, it was inferior in terms of thermal conductivity as compared with that of the vacuum heat insulating material 1 of the first embodiment.

  Based on the above, it has been found that the vacuum heat insulating material 1 of Embodiment 1 is the most excellent in terms of both heat insulating performance and prevention of bag breaking of the outer packaging material 2. This is because the organic fiber non-woven fabric 4 provided around the core material 3 can prevent the core material 3 from scratching the outer packaging material 2, and the organic fiber non-woven fabric 4 can secure voids, thereby conducting heat conduction. This is probably because the rate decline was prevented.

  Moreover, the vacuum heat insulating material 1 of Embodiment 1 uses polyethylene terephthalate, a polystyrene, a polypropylene, a polylactic acid fiber etc. as a material of the organic fiber which comprises the nonwoven fabric 4. FIG. Since these organic fibers originally have a low thermal conductivity, the heat insulating performance can be improved. Furthermore, since polylactic acid is biodegradable, the disassembled and separated fibers can be landfilled after the use of the product.

  Moreover, since the organic fiber which comprises the nonwoven fabric 4 is a continuous fiber, the vacuum heat insulating material 1 of Embodiment 1 is easy to produce the nonwoven fabric 4. FIG.

  In addition, organic fibers have a lower tensile elastic modulus than inorganic fibers and are excellent in flexibility. The vacuum heat insulating material 1 according to the first embodiment has an organic fiber non-woven fabric 4 around an inorganic fiber core material 3, and therefore has good workability when it needs to be bent and used.

Embodiment 2. FIG.
FIG. 3 is a front sectional view schematically showing a heat insulation box (in this embodiment, a refrigerator) according to the second embodiment. In addition, the same code | symbol is attached | subjected to the part same as Embodiment 1, and one part description is abbreviate | omitted.
In FIG. 3, the refrigerator 100 which is a heat insulation box includes an outer box 9, an inner box 10 disposed inside the outer box 9, a vacuum heat insulating material 1 disposed between the outer box 9 and the inner box 10, and A polyurethane foam (heat insulating material) 11 and a refrigeration unit (not shown) for supplying cold heat into the inner box 10 are provided. The outer box 9 and the inner box 10 are each formed with an opening on a common surface, and an opening / closing door (not shown) is installed in the opening, and the internal temperature of the inner box 10 is adjusted by temperature adjusting means. Adjusted.

  In the refrigerator 100 which is the heat insulation box of Embodiment 2, since the outer packaging material 2 of the vacuum heat insulating material 1 includes an aluminum vapor deposition layer, there is a possibility that a heat bridge in which heat flows through the aluminum vapor deposition layer may occur. In order to suppress the influence of this heat bridge, the vacuum heat insulating material 1 is disposed away from the coated steel plate of the outer box 9 using a spacer 8 which is a resin molded product. In addition, the spacer 8 is provided with a hole for not inhibiting the flow so that a void does not remain in the polyurethane foam 11 injected into the heat insulating wall in a later step.

  That is, the refrigerator 100 has a heat insulating wall 12 formed by the vacuum heat insulating material 1, the spacer 8 and the polyurethane foam 11. In addition, the range in which the heat insulation wall 12 is arrange | positioned is not limited, Even if it is the whole range of the clearance gap formed between the outer box 9 including the ceiling wall 13 and the bottom wall 14, and the inner box 10. It may be a part, or may be arranged inside the opening / closing door.

  In addition, although the above showed the case where the heat insulation box was the refrigerator 100, this invention is not limited to this, Cold-heat equipment or thermal equipment, such as a heat retention box, a vehicle air conditioner, a water heater, Instead of a box having a predetermined shape, a heat insulating bag (heat insulating container) having a deformable outer bag and an inner bag may be used.

  DESCRIPTION OF SYMBOLS 1 Vacuum heat insulating material, 2 outer packaging material, 3 core material, 4 organic fiber nonwoven fabric, 8 spacer, 9 outer box, 10 inner box, 11 polyurethane foam (heat insulating material), 12 heat insulating wall, 13 ceiling wall, 14 bottom wall, 100 Refrigerator (insulation box).

Claims (11)

It is a vacuum heat insulating material that contains a core material composed of inorganic fibers inside an outer packaging material having gas barrier properties and is sealed in a reduced pressure state inside,
A vacuum heat insulating material characterized in that an organic fiber non-woven fabric is provided between the core material and the outer packaging material.   The vacuum heat insulating material according to claim 1, wherein the core material is sandwiched between non-woven fabrics of organic fibers.   The vacuum heat insulating material according to claim 1, wherein the core material is placed in a bag shape of the organic fiber non-woven fabric.   The vacuum heat insulating material according to claim 1, wherein the core material is wrapped with a non-woven fabric of organic fibers.   5. The vacuum heat insulating material according to claim 1, wherein the material of the organic fiber nonwoven fabric is polyethylene terephthalate, polystyrene, polypropylene, or polylactic acid fiber.   The vacuum heat insulating material according to any one of claims 1 to 5, wherein the organic fiber is a continuous fiber.   It has flexibility, The vacuum heat insulating material in any one of the Claims 1 thru | or 6 characterized by the above-mentioned.   An outer box and an inner box arranged inside the outer box, wherein the vacuum heat insulating material according to any one of claims 1 to 7 is arranged between the outer box and the inner box. Insulated box characterized by.   The heat insulation according to claim 8, wherein a heat insulating material is filled between the outer box and the vacuum heat insulating material and / or between the inner box and the vacuum heat insulating material. box.   The heat insulating box according to claim 8 or 9, wherein a spacer is disposed between the outer box and the vacuum heat insulating material.   The heat insulating box according to any one of claims 8 to 10, further comprising temperature adjusting means for adjusting a temperature inside the inner box.

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