JPH09145240A - Vacuum insulation material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct two independent vessels out of a double-layer vacuum insulation pack, to improve operability on the occasion of vacuum degasification, to reflect the heat from the high temperature side and to prevent penetration of the heat into the low temperature side. SOLUTION: Bag-shaped vessels 1 are formed of laminate films each constituted of a resin film and a metal leaf, and a partition layer 2 dividing the inside into two isolated vessels independent of each other and formed of the laminate film or the like is provided in a virtually middle part of the vessels 1, while a core material 3 having an open-cell structure is filled inside the two vessels. Two independent vacuum pack structures are prepared by heat-sealing the peripheral edge parts of the vessels 1, by filling the core material in the two vessels and by heat-sealing open parts of these vessels after vacuum degasification of the inside thereof is made.

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, and more particularly to a vacuum heat insulating material having a two-layer vacuum structure in which two independent containers are respectively filled with a core material.

[0002]

2. Description of the Related Art FIG. 2 shows a structure of a conventional vacuum heat insulating material used for a case or a door of an electric refrigerator or the like. An inorganic foaming fine powder 5 such as pearlite is filled in a closed container 6 made of a single layer or laminated laminate film such as polyethylene or a metal vapor deposition film, and the inside of the container is deaerated under vacuum to form a vacuum insulation pack 7. The vacuum insulation pack 7 is used as a core material, and the laminate film 9 is covered with a soft foam material 8 having open cells such as urethane foam around the core material,
It had a double-vacuum adiabatic structure in which the inside was vacuum degassed. The above structure has a problem in that it is necessary to perform vacuum deaeration for each of the inner and outer vacuum heat insulating packs, and the manufacturing cost is increased because the structure is complicated.

[0003]

In view of the above problems, the present invention has an advantage that two independent layers of containers can be vacuum-degassed at the same time, and the manufacturing cost can be reduced because the structure is simple. In addition, it is possible to provide a means for reflecting heat from the high temperature side, making it difficult for heat to enter the low temperature side, and maintaining the heat insulating performance in the other layer even if one layer is reduced in vacuum. To aim.

[0004]

The present invention has been made to solve the above-mentioned problems, and a partition layer is interposed between upper and lower layers formed of a laminated laminate film of a resin film and a metal foil, After filling the core material having an open-cell structure in a bag-shaped container in which two peripheral upper and lower chambers are heat-sealed and vacuum degassing the inside,
It is characterized in that the opening of the container is sealed by heat sealing. Further, it is characterized in that an aluminum foil is used as the partition layer. Further, a laminate film made of a polyethylene terephthalate (PET) film and an aluminum foil is used as the partition layer. Further, it is characterized in that silica or open-cell urethane is used as the core material.

[0005]

With the above structure, two independent containers are provided, and the intermediate layer is made of the aluminum foil to form the partition layer, so that the heat from the high temperature side is reflected and it is difficult for the heat to enter the low temperature side. At the same time, even if one layer is reduced in vacuum, the other layer can maintain the heat insulating performance.

[0006]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In FIG. 1, reference numeral 1 is a bag-shaped container composed of an upper layer and a lower layer made of a multilayer laminate film composed of a resin film and a metal foil. Reference numeral 2 is a partition layer formed of a laminate film or the like that separates the substantially middle portion inside the container into two independent containers.
Reference numeral 3 is a core material having an open cell structure that is filled inside the two containers. A high gas barrier polyethylene terephthalate (PET) film or the like is used as the resin film of the container 1, and an aluminum foil or the like is used as the metal foil. The partition layer 2 is an aluminum foil having good heat reflectivity, or
A laminated film made of polyethylene terephthalate and aluminum foil is used. As the core material 3, lightweight open-cell urethane, silica, glass wool, or the like is used.

With the above-mentioned structure, the container 1 and the partition layer 2 form two independent containers each having a three-layer structure, and the peripheral portions of the containers are heat-sealed to form the inside of the two independent containers. The core material 3 is filled in, the inside of the container is vacuum degassed to 1 × 10 ⁻³ Torr or less, and the opening of the container is sealed by heat sealing. Can be formed.

[0008]

As described above, according to the present invention, by forming a partition layer with a metal foil or the like so as to separate the inside of the container into two independent containers at the intermediate portion, heat from the high temperature side can be prevented. It is possible to reflect the light to make it difficult for heat to enter the low temperature side, and even if one layer is reduced in vacuum, the other layer can maintain the heat insulating performance.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of a conventional vacuum heat insulating material.

[Explanation of symbols]

 1 container 2 partition layer 3 core material

Claims (4)

[Claims] 1. A bag-like structure in which a partition layer is interposed between upper and lower layers made of a laminated laminate film of a resin film and a metal foil, and a peripheral portion of the partition layer is heat-sealed to form two upper and lower independent chambers. A vacuum heat insulating material, characterized in that a core material having an open cell structure is filled in a container, the interior is vacuum deaerated, and then the opening of the container is sealed by heat sealing. 2. The vacuum heat insulating material according to claim 1, wherein an aluminum foil is used as the partition layer. 3. The vacuum heat insulating material according to claim 1, wherein a laminated film made of a polyethylene terephthalate (PET) film and an aluminum foil is used as the partition layer. 4. The vacuum heat insulating material according to claim 1, wherein silica or open-cell urethane is used as the core material.