JPH0560457A - Heat-insulating vacuum pack and manufacture thereof - Google Patents

Abstract

PURPOSE:To obtain a heat-insulating vacuum pack which can be industrially inexpensively manufactured and has stable performance in the pack usable as a heat insulator for a refrigerator, etc. CONSTITUTION:A heat-insulating vacuum pack is composed of a core material 2 and a vessel 4 made of a laminated film 3 formed of an outer layer 5, an intermediate layer 6 having cutouts 9 and an inner layer 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum heat insulating material pack which can be used as a heat insulating material for refrigerators and the like.

[0002]

2. Description of the Related Art A conventional vacuum heat insulating material pack has 10
-Inorganic foamed powder such as pearlite that maintains a vacuum level of -2 Torr or less was covered with a plastic-metal foil laminate film container. On the contrary, if the thickness of the foil is sufficiently increased, the surface heat conduction is increased by increasing the thickness of the metal foil, and the thermal conductivity of the vacuum heat insulating material pack in the initial state is increased, resulting in a drawback that the heat insulating performance is deteriorated.

For example, in the case of coating with aluminum foil having a thickness of 30 μ and in the case of not coating aluminum foil, the initial value is 0.0.
080 Kcal / mh ° C and 0.0060 Kcal / mh
There was a significant difference in ° C. Therefore, there has been a need for a container having excellent initial values and having little change over time. As means for solving such a problem, there is one described in Japanese Utility Model Laid-Open No. 58-111498.

The contents described in Japanese Utility Model Laid-Open No. 58-111498 will be described with reference to FIGS. 4 and 5. In the figure, numeral 15 is a vacuum heat insulating material pack, which is an inorganic foamed powder 1 such as pearlite.
6 and laminating film 1 of plastic-metal foil
It consists of a seven-made container 18. The film 17 is composed of a plastic film such as polypropylene having a thickness of 20 μ for the outer layer 19, a metal foil made of aluminum foil having a thickness of 30 μ for the middle layer 20, and a plastic film such as polyethylene having a thickness of 50 μ for the inner layer 21. , Which are adhered to each other to form a laminating film, 2
The inorganic foamed powder 16 is filled between the laminate films 17 to seal the outer periphery. Here, the middle layer 20 covers the surface of the seal portion 22 up to a distance of 5 mm from the adhesive inner end 23.

By using a laminate film having such a structure, since there is no metal foil in the seal portion, a vacuum heat insulating material pack having a low thermal conductivity and excellent initial characteristics can be obtained. Since the non-existing portion is small with respect to the entire surface area, it is characterized in that a vacuum heat insulating material pack with a little change over time, which is equivalent to the case where the metal foil is completely covered, is obtained.

[0006]

However, in the production of the conventional laminate film, when the size of the container is 50 × 50 × 4 tcm, the outer layer plastic film is cut into a size of 53 × 53 cm, Cut the metal foil of the middle layer into a size of 51.5 × 51.5 cm,
Furthermore, the plastic film of the inner layer must be cut into a size of 53 × 53 cm, and each must be attached.

[0007] In such a method, since it is cut into a predetermined size in advance, continuous production is difficult and there is a problem that it cannot be manufactured industrially at low cost.

Further, if the mounting position of the middle-layer metal foil is deviated, the upper and lower metal foils come into contact with each other at the heat seal portion, and there is a problem that heat insulation performance is deteriorated and stable performance cannot be obtained. It was

The present invention solves the above-mentioned conventional problems, and an object thereof is to obtain a vacuum heat insulating material pack which can be manufactured industrially at low cost and has stable performance.

[0010]

In order to solve the above-mentioned conventional problems, the vacuum heat insulating material pack of the present invention comprises a core material having an open cell structure and a metal foil whose peripheral portion is preheated and oxidatively deteriorated. The plastic-metal foil laminate film container is included, and the metal foil of the plastic-metal foil laminate film is partially cut by the tension generated when the pressure is reduced to make it discontinuous.

In the method for manufacturing a vacuum heat insulating material pack according to the present invention, the metal foil of the plastic-metal foil laminated film is heated at a predetermined interval in advance to be oxidized and deteriorated, and then the laminated film is used to form continuous cells. This is a manufacturing method in which a core material having a structure is covered and the peripheral edge portion is heat-sealed so that the metal foil is partially cut by the tension generated when the pressure is reduced to be discontinuous.

[0012]

With the above structure, since the metal foil is cut when the pressure is reduced, it is not necessary to attach the metal foil that has been cut to a predetermined size in advance, so that there is no metal foil attachment deviation and stable performance can be obtained. ..

Further, since the metal foil is cut in advance by heating and deteriorating it at a constant interval so that the metal foil is cut by the tension generated when the pressure is reduced, it is not necessary to cut the metal foil to a predetermined size, and continuous production is possible. It can be manufactured at low cost.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 1 denotes a vacuum heat insulating material pack, which comprises a core material 2 such as an open-celled hard urethane foam and a container 4 made of a plastic-metal foil laminate film 3. The film 3 is composed of a plastic film such as polypropylene having a thickness of 20 μ for the outer layer 5, a metal foil made of an aluminum foil having a thickness of 30 μ for the middle layer 6, and a plastic film such as polyethylene having a thickness of 50 μ for the inner layer 7. And are adhered to each other to form a laminate film.

The core material 2 of the open-cell rigid urethane foam is provided between the two laminating films 3 to seal the outer circumference. Reference numeral 8 is the seal portion, which is a heat seal.
I am

Here, since the metal foil of the middle layer 6 is heated and deteriorated in advance at regular intervals, it occurs when the laminate film follows the shape of the core material 2 of the open-cell rigid urethane foam during depressurization. The discontinuous portion 9 is formed by the tension and is discontinuous.

As described above, since the metal foil is cut during depressurization, it is not necessary to attach the metal foil that has been cut to a predetermined size in advance, so that it is possible to prevent the heat insulation performance from being deteriorated due to the displacement of the metal foil. ..

A method of manufacturing this vacuum heat insulating material pack will be described with reference to FIG. In the figure, a laminate film 10 comprises an outer layer 11 made of polypropylene having a thickness of 20 .mu.m and an intermediate layer 12 made of aluminum foil having a thickness of 30 .mu.m.
And an inner layer 13 made of polyethylene having a thickness of 50 .mu.m. In the middle layer 12, oxidization-deteriorated portions 14 due to heating are provided in advance at regular intervals in accordance with a desired container size. Further, with respect to the peripheral portion located in the vertical direction of the peripheral portion, the size of the middle layer 12 is made smaller than the sizes of the outer layer 11 and the inner layer 13.

According to such a method, it is not necessary to previously cut into a predetermined size as in the prior art, and it is possible to continuously produce a laminate film, which can be industrially produced at a low cost. ..

Further, since the aluminum foil 12 is cut and discontinuous, the heat leak due to the aluminum foil 12 is small and the heat insulation performance is 0.0065 Kcal / mh ° C., which is 0.0060 Kcal when there is no aluminum foil at all. / Mh ° C can be approached.

Further, it was found that even with the aging, the portion without the aluminum foil was about 1% of the whole, and it was found that the performance was kept almost the same as in the case of being completely covered with the aluminum foil.

[0022]

INDUSTRIAL APPLICABILITY As described above, the present invention comprises a core material having an open cell structure and a plastic-metal foil laminating film having a metal foil whose peripheral portion is preheated to be oxidized and deteriorated, and is produced when pressure is reduced. Since this is a vacuum heat insulation panel in which the metal foil of the plastic-metal foil laminate film is partially cut by tension to be discontinuous, there is no sticking of the metal foil, and stable heat insulation performance can be obtained.

Further, a metal foil of a laminate film made of a plastic-metal foil is heated at a predetermined interval in advance to be oxidized and deteriorated, and then the core material having an open cell structure is covered with the laminate film and a peripheral edge portion is formed. Since it is a manufacturing method of a vacuum heat insulating material pack in which the metal foil is partially cut by the tension generated when heat-sealing and depressurizing, it is possible to continuously produce a laminate film, which is industrially inexpensive. Can be produced.

[Brief description of drawings]

FIG. 1 is a sectional view of a vacuum heat insulating material pack according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of an essential part of FIG.

FIG. 3 is a manufacturing diagram of a vacuum heat insulating material pack according to an embodiment of the present invention.

FIG. 4 is a sectional view of a conventional vacuum heat insulating material pack.

5 is an enlarged cross-sectional view of the main part of FIG.

[Explanation of symbols]

 1 Vacuum insulation material pack 2 Core material 3 Laminate film 4 Container

Claims (2)

[Claims] 1. A plastic having a core material having an open cell structure and a metal foil whose peripheral portion is preheated to be oxidized and deteriorated-a container of a laminate film of a metal foil, wherein the plastic is formed by a tension generated during depressurization. Metal foil Laminated vacuum heat insulation material pack made by cutting metal foil of the film partially. 2. A plastic-laminate composed of a metal foil.
The metal foil of the laminated film is heated at a predetermined interval in advance to be oxidized and deteriorated, and then the core material having an open cell structure is covered with the laminated film, and then the peripheral portion of the laminated film is heat-sealed to reduce the pressure. A method for manufacturing a vacuum heat insulating material pack, wherein the metal foil is partially cut by a tension generated when the vacuum heat insulating material pack is discontinuous.