JPH06300181A - Vacuum heat insulating pack - Google Patents

Abstract

PURPOSE:To provide a vacuum pack which is usable as a heat insulating material for a refrigerator, can be manufactured industrially at a low cost, and constituted to have stable performance. CONSTITUTION:A through-hole 17 is formed in a film-molded molding material 12. A vacuum heat insulating material pack comprises an upper cover material 15 formed such that a barrier material is peripherally welded to a part of the molding material 12 in a manner to cover the through-hole 17 therewith; a lower cover material 16; and a core 10.

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 becomes large, so that the heat insulating performance is deteriorated.

For example, in the case of coating with an aluminum foil having a thickness of 30 μ and in the case of not coating the 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, a container having excellent initial values and having little change over time has been required.

As a means for solving such a problem, there is one disclosed 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. 5 and 6. In the figure, reference numeral 1 denotes a vacuum heat insulating material pack, which is composed of an inorganic foamed powder 2 such as pearlite and a container 3 made of a plastic-metal foil laminating film. The film is composed of the outer layer 4
A plastic film such as polypropylene having a thickness of 20μ, a metal foil made of an aluminum foil having a thickness of 30μ for the middle layer 5, and a plastic film having a thickness of 50μ for the inner layer 6 such as polyethylene. The inorganic foamed powder 2 is filled between two laminate films to seal the outer periphery.
I am

Here, the middle layer covers the surface of the seal portion 7 up to a distance of 5 mm from the adhesive inner end 8. By using the laminated film having such a structure, since the seal portion 7 has no metal foil, the vacuum heat insulating material pack 1 having a low thermal conductivity and excellent initial characteristics can be obtained, and the metal foil does not exist. Since the portion is minute with respect to the entire surface area, it is characterized in that the vacuum heat insulating material pack 1 with a little change over time, which is equivalent to the case of being completely covered with the metal foil, can be obtained.

[0007]

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.

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

Further, in the conventional vacuum heat insulating material pack, when it is attached to the wall surface of the heat insulating box, since the heat seal portion at the periphery is separated from the wall surface, the heat insulating material is filled with the foam heat insulating material.
There is a problem that a cavity is formed in the space between the toe seal and the wall surface, resulting in poor appearance due to shrinkage and significantly impairing product quality.

The present invention solves the above-mentioned conventional problems, and can be manufactured industrially at low cost, and a vacuum heat insulating material pack having stable performance can be obtained, and the product quality is excellent. The present invention is intended to provide a heat insulating box.

[0012]

In order to solve the above-mentioned conventional problems, the vacuum heat insulating material pack of the present invention is a plastic-metal foil laminator in which a through-hole is provided in a molding material formed by molding a plastic laminate film. A cover material formed by welding a barrier material made of a film to a peripheral portion of a part of the molding material, a lower lid material made of a plastic-metal foil laminating film, and a core material having a continuous opening structure, and a vacuum. After packaging, the barrier material and the molding material are welded together including at least the periphery of the through hole.

Further, in the heat insulation box of the present invention, the lid side of the vacuum heat insulation material pack is attached to the wall surface of the heat insulation box as an adhesive surface, and the foam heat insulation material is provided in the space formed by the outer box and the inner box. It is filled.

[0014]

With the above structure, since the barrier material made of the plastic-metal foil laminated film is partially attached to the molding material, excellent heat insulation performance is obtained with less heat conduction by the metal foil, and the barrier material is molded. Since it is provided only on the material, stable performance can be obtained without the upper and lower metal foils coming into contact with each other due to the displacement of the attachment position of the barrier material.

Further, since the barrier material is attached to the formed molding material by peripheral edge welding, the mounting is easy, continuous production is possible, and the manufacturing cost can be reduced industrially.

Furthermore, a plastic material having a through hole formed in a molding material formed by molding a plastic laminate film.
A barrier material made of a metal foil laminate film is peripherally welded to a part of the molding material to form an upper lid material.However, in the case where there is no through hole, when the pressure is reduced in a decompression container, the barrier material and the molding material are separated. The residual air between the layers may expand and break the peripheral edge of the welding to eliminate the effect of providing the barrier material. The provision of the through hole can solve this point and contribute to the stabilization of the quality. Then, after vacuum packaging, since the barrier material and the molding material are welded at least including the peripheral edge of the through hole, the external invading gas that has permeated the molding material does not reach the inside through the through hole without resistance, There is no decrease in heat insulation performance due to the increase in internal pressure.

Further, since the molding material is formed by vacuum molding, when the vacuum heat insulating pack is attached to the wall surface of the heat insulating box, it is preferable that the heat seal portion at the periphery is in close contact with the wall surface. As a result, it is possible to obtain a heat-insulating box with stable product quality, which does not cause shrinkage due to the formation of voids when the foam heat-insulating material is filled.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, and 4.

In FIG. 1, 9 is a vacuum heat insulating material pack, which is a core material 10 such as a rigid urethane foam having continuous cells, a molding material 12 obtained by vacuum molding a plastic laminate film 11, and a plastic-metal foil laminate film 13. The upper lid member 15 is composed of the barrier material 14 and the lower lid member 16 of the plastic-metal foil laminated film 13.

The film 11 has a structure in which the outer layer has a thickness of 30 μm.
20μ in the middle layer of plastic film with excellent chemical resistance and gas barrier resistance such as modified acrylonitrile
It consists of a plastic film with excellent gas barrier resistance such as polyvinylidene chloride with a thickness of 30 μm, and a plastic film with a chemical resistance such as modified acrylonitrile with a thickness of 30 μ and a gas barrier resistance with an inner layer. -It is a film.

The structure of the film 13 is 30 μm in the outer layer.
Plastic film with excellent resistance to gas barrier properties such as modified acrylonitrile, etc., metal foil made of aluminum foil with a thickness of 9μ in the middle layer, chemical resistance such as modified acrylonitrile with a thickness of 30μ in the inner layer It consists of a plastic film with excellent gas barrier properties, and is bonded to form a laminate film.

The molding material 12 is obtained by molding the laminate film 11 into a concave shape by a vacuum molding machine.

Reference numeral 17 denotes a through hole provided in the central portion of the barrier material 14, and the barrier material 14 having the desired size having the through hole 14 is attached to the flat portion 18 of the molding material 12. At the time of attachment, the peripheral edge portion 19 of the barrier material 14 is heat-sealed to the molding material 12 by heat sealing.
An interlayer space 20 between the barrier material 14 and the barrier material 14 is opened on the core material 10 side through a through hole 17.

The core member 10 is attached to the upper lid member 15 thus formed.
And the lower lid member 16 is arranged so as to overlap the peripheral edge of the upper lid member 15, and first, two opposite sides of the peripheral edge are heat-sealed. Then, install it in a decompression container (not shown),
While decompressing the inside, the remaining two sides are
And sealed. Then, the peripheral edge 21 of the through hole 17 is heat-sealed with the molding material 12 to obtain the vacuum heat insulating material pack 9.

With the above-mentioned structure, the barrier material 14 having the metal foil is partially adhered, so that the heat conduction by the metal foil is small and excellent heat insulation performance is obtained, and the barrier material 14 is the molding material 12. Since it is provided only on the flat portion 18, the stable performance can be obtained without the upper and lower metal foils coming into contact with each other due to the displacement of the attachment position of the barrier material 14.

Further, according to the above-mentioned method, the barrier material 14 having the metal foil is formed into a molding material 12 by a heat seal.
Since it is attached to, it is easy to attach, continuous production is possible, and it is possible to industrially manufacture at low cost.

Further, a through hole 17 is provided in the barrier material 14,
Since it is attached to the molding material 12, the interlayer space 20 between the molding material 12 and the barrier material 14 is connected to the core material 10 through the through hole 17. As a result, when the decompression container 21 is installed and decompressed, the interlayer space 20 is also decompressed, and the residual air in the interlayer space 20 generated when there is no through hole expands and breaks the welding peripheral edge 19 to cause a barrier. This contributes to stable quality without the phenomenon of breaking the material 14. After that, the peripheral edge 21 of the through hole 17 is heat-sealed with the molding material 12 to obtain the vacuum heat insulating material pack 9.
The external invading gas that has passed through does not reach the inside through the through hole 17 without resistance, and the heat insulating performance does not deteriorate due to the increase in internal pressure.

In FIG. 4, reference numeral 22 denotes a heat-insulating box body, and an inner box 23.
And an outer box 24, a vacuum heat insulating material pack 9 mounted on the inner surface of the outer box 24 without a gap, and a foamed heat insulating material 25 filled in a space formed by the inner box 23 and the outer box 24.

With the above structure, since the vacuum heat insulating material pack 9 is attached to the inner surface of the outer box 24 without any gap, the space formed by the inner box 23 and the outer box 24 is filled with the foamed heat insulating material 25. It is possible to obtain a heat-insulating box body with stable product quality without shrinkage and no shrinkage.

[0030]

As described above, according to the present invention, a barrier material made of a plastic-metal foil laminate film having through holes is welded to a molding material formed by molding a plastic laminate film on a peripheral edge of a part of the molding material. And the upper lid material
A vacuum heat insulating material pack comprising a lower lid material made of a plastic-metal foil laminate film and a core material having a continuous opening structure, and after vacuum packaging, a barrier material and a molding material are welded at least including the peripheral edge of the through hole. Therefore, there is no heat conduction due to the metal foil, excellent heat insulating performance is obtained, and stable performance is obtained.

Further, since the molding material and the peripheral edge portion of the barrier material are attached by welding, the attachment is easy, continuous production is possible, and it is possible to industrially manufacture at low cost.

Further, since the through hole is formed in the barrier material and the through hole is attached to the molding material, the interlayer space between the molding material and the barrier material is connected to the core material side through the through hole. As a result,
When installed in a decompression container and decompressed, the interlayer space is also decompressed, so it is possible to prevent the destruction of the welded peripheral part due to residual air expansion of the interlayer space, which occurs when there is no through hole, and the function of the barrier material is demonstrated. In addition, since the periphery of the through hole is heat-sealed with the molding material to obtain a vacuum heat insulating material pack, external invading gas that has permeated the molding material passes through the through hole without resistance. It does not reach the inside, and there is no decrease in heat insulation performance due to the increase in internal pressure.

Further, since the molding material is made by molding, when the vacuum heat insulating pack is attached to the wall surface of the heat insulating box, it is possible to make the peripheral heat seal part in close contact with the wall surface. Therefore, it is possible to obtain a heat-insulating box with stable product quality, which does not cause shrinkage due to the formation of voids when the foam heat-insulating material is filled.

[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 cross-sectional view of a molding material of a vacuum heat insulating material pack in the process of being manufactured in an embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view of a molding material for a vacuum heat insulating material pack according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view of a heat insulating box according to an embodiment of the present invention.

FIG. 5 is a sectional view of a conventional vacuum heat insulating material pack.

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

[Explanation of symbols]

 9 Vacuum Insulation Material Pack 10 Core Material 11 Plastic Laminated Film 12 Molding Material 13 Plastic-Metal Foil Laminated Film 14 Barrier Material 15 Upper Lid Material 16 Lower Lid Material 17 Through Hole 21 Thermal Insulation Box 22 Inner Box 23 Outer Box 24 Foamed Insulation Material

Claims (3)

[Claims] 1. An upper lid member formed by welding a barrier material made of a plastic-metal foil laminate film having a through hole to a molding material formed by molding a plastic laminate film to a peripheral edge of a part of the molding material, and a plastic. A vacuum heat insulating material pack comprising a lower lid material made of a metal foil laminated film and a core material having a continuous opening structure, and vacuum-packed, and then a barrier material and a molding material are welded to each other including at least the periphery of the through hole. 2. A heat-insulating box body obtained by filling a foamed heat-insulating material in a space formed by combining an outer box and an inner box, wherein a through-hole is provided in a molding material formed by molding a plastic laminate film, and the through-hole is formed. An upper lid member formed by covering and covering a barrier material made of plastic-metal foil laminated film with a peripheral edge of a part of the molding material, a lower lid member made of plastic-metal foil laminated film, and a continuous opening structure. A heat insulation box body, in which a vacuum heat insulation material pack including the core material is provided on the wall surface of the heat insulation box body. 3. The heat insulating box according to claim 2, wherein the lid side of the vacuum heat insulating material pack is attached to the wall surface of the heat insulating box as an adhesive surface.