JPS61125577A - Heat insulator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat insulating body used in a heat insulating box for a refrigerator, a freezer, a showcase, or a refrigerator.

Structure of the conventional example and its problems FIGS. 3 to 5 show a heat insulator used in a conventional refrigerator or the like. The configuration of this conventional example will be explained below with reference to FIGS. 3 to 6.

In the figure, 1 is a heat insulating material pack, 2 is a breathable inner bag, and 3 is a powder such as perlite filled in the inner bag 2. Reference numeral 4 denotes an outer bag made of a first laminate film 5 made of metal foil and plastics, and the first laminate film 6 has an outer layer made of a plastic film such as polypropylene with a thickness of 20μ, and an inner layer made of aluminum foil with a thickness of 30μ. It consists of a metal foil 7, an inner layer [60μ thick plastic film 8 such as polyethylene].

After inserting the inner bag 2 filled with the powder 3 into the outer bag 4 and reducing the internal pressure to below 0.1 Torr, the opening of the outer bag 4 is sealed with heat meal and the heat insulating material They form pack 1. Reference numeral 9 is a heat insulator for a pre-knob refrigerator, etc., and the heat insulating material pack 1 is replaced with an inner plate 1 made of synthetic resin or the like.
o and the metallic outer plate 11, arranged in contact with the outer plate 11,
Further, a foamed heat insulating material 12 such as rigid polyurethane foam is integrally foamed between both plates.

Next, the operation of the conventional example will be explained.

In the heat insulating body 9 having such a configuration, the degree of vacuum inside the heat insulating material pack 1 is set to 0. In order to maintain the temperature below ITorr for a long period of time, K is the outer bag 4 made of the first laminate film 6 of metal foil and plastics against moisture, air, and R-11 contained in the foam insulation material 12 such as rigid polyurethane foam. High barrier properties were required, and the metal foil 7 had to be sufficiently thick. However, if the thickness of the metal foil 7 is increased enough, the thickness increases, which increases the surface heat conduction, which deteriorates the thermal conductivity of the insulation pack 1, resulting in poor insulation performance as the insulation material 9. had.

OBJECTS OF THE INVENTION The present invention eliminates the drawbacks of the above-mentioned conventional examples, and aims to maintain the degree of vacuum inside a heat insulating material pack for a long period of time, and to improve the heat insulating performance of the heat insulating body.

Structure of the Invention In order to achieve the above object, the present invention has provided an outer bag of a heat insulating material pack with two layers: a first laminate film of metal foil-plastics and a second laminate film having an aluminum vapor deposited layer.
Formed with different types of laminate films facing each other,
The plastic laminate film side having the aluminum vapor-deposited layer of the insulation pack is fixed to one of a pair of plates placed between the insulation pack, and a foam insulation material such as urethane is filled between the pair of plates. Since it is a heat insulator made of the following, it is possible to maintain a degree of vacuum of 1 Torr or less inside the heat insulator pack over a long period of time, and improve the heat insulation performance of the heat insulator.

Description of examples FIG. 1 shows the configuration of an embodiment of the present invention.

A description will be given with reference to FIG. 2, and the same components as those of the conventional system will be given the same reference numerals and detailed description thereof will be omitted.

In the figure, 13 is a second laminate film having an aluminum vapor deposited layer 14, the outer layer is a plastic film 6 such as polypropylene with a thickness of 20 μm, the middle layer is an aluminum vapor deposited layer 14 of about 600 people, and the inner layer is [50 μ thick]. It consists of a plastic film 8 such as polyethylene.

16 heat-seals the second laminate film 13 having the aluminum vapor-deposited layer 14 and the first laminate film 6 of metal foil-plastics on three sides so that the inner heat-sealing layer 8 of polyethylene or the like is on the inner surface. This is the outer bag formed by

The inner bag 2 filled with powder 3 such as pearlite is pushed into this bag 15 to make the inside zero. After reducing the pressure to ITorr or less, the opening of the outer bag 15 is sealed by heat sealing to form a heat insulating material pack 16. Reference numeral 17 denotes a heat insulating body for a prefabricated refrigerator or the like, and the side of the second laminate film 13 having the aluminum vapor deposited layer 14 of the heat insulating material bank 16 is placed between the inner plate 1o made of synthetic resin or the like and the outer plate 11 made of metal. Further, a foamed heat insulating material 12 such as rigid polyurethane foam is integrally foamed between both plates.

Therefore, in the heat insulating body 17 having such a configuration,
Since the heat transfer resistance in the X direction in FIG. 2 is large, the heat does not directly travel in the X direction but tries to travel through the outer bag 16 of the heat insulator pack 16 into the inside of the heat insulator 1γ. However, since the heat transfer resistance of the second laminate film 13 having the aluminum vapor-deposited layer disposed in contact with the outer panel 11 of the heat insulating material pack 18 is much higher than that of the first laminate film 5 made of metal foil and plastics, the heat is This makes it difficult for heat to be transmitted to the inside of the heat insulating body 17 through the side surface of the material pack 1e, and the heat transfer performance of the whole heat insulating body 17 is greatly improved compared to the outer bag 4 made of the first laminate film of metal foil and plastics. In addition, the reliability of the barrier properties of the insulation pack 16 against moisture, air, and R-11 contained in the foam insulation material 12 such as rigid polyurethane foam is determined from the metal outer panel 11 to the insulation pack 1.
6 is small, the contact area of the second laminate film 13 having the aluminum vapor-deposited layer 14 with the foamed heat insulating material 12 such as rigid polyurethane foam becomes very small. This is equivalent to the heat insulating material pack 1 made of the first plastic laminate film 5.

Therefore, 0.0% inside the heat insulating board. Effects of the Invention The present invention is configured as described above, and has the following effects. That's what you get.

+a> By placing the first laminate film side of the metal plastic of the outer bag on the foam insulation material side such as rigid polyurethane foam, the reliability of the insulation pack against moisture, air, and R-11 contained in the foam insulation material is increased. The gender is
This is significantly improved compared to an outer bag formed of a second laminate film having an aluminum vapor-deposited layer.

(b) By arranging the second laminate cover having the aluminum vapor-deposited layer of the outer bag with the ilm side in contact with the outer plate, the second laminate
Since the contact area between the laminate film and the foam insulation material is very small and can be ignored, the barrier properties against moisture, air, and R-11 contained in the foam insulation material are as follows: It is equivalent to a wood pack.

(C) Since the heat transfer resistance of the second laminate film having the aluminum vapor-deposited layer is much higher than that of the first laminate film of metal foil and plastics, the second laminate film having the aluminum vapor-deposited layer of the outer bag is By placing it in contact with the board, it becomes difficult for the heat that would like to pass through the outer bag to be transmitted to the inside, and the insulation performance of the entire insulation body is
This has the advantage of being significantly improved compared to the outer bag made of the first laminate film of metal foil and plastics.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a heat insulating board according to an embodiment of the present invention, Fig. 2 is a sectional view of a main part of a heat insulating body similar to Fig. The figure is an enlarged cross-sectional view of the heat insulating plate shown in FIG. 1, and FIG. 5 is a cross-sectional view of a main part of a heat insulating body using the same heat insulating plate. 16... Insulation pack, 16... Outer bag, 3... Powder, 6... First laminate film, 7... Gold R foil, 10... Inner plate, 11... Outer plate, 13... Second laminate film, 14... Aluminum vapor deposited layer, 17
...Insulator. Name of agent: Patent attorney Toshio Nakao and 1 other list 1
Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] This is a heat insulating material pack consisting of powder and an outer bag containing the powder and having a reduced pressure inside. The second laminate film is formed by placing two types of laminate films on the front and back sides, and the second laminate film side having the aluminum vapor-deposited layer of the insulation pack is fixed to one side of a pair of plates sandwiching the insulation pack. A heat insulator made by filling foam insulation material between two plates.