JPH06337091A - Vacuum insulation pack - Google Patents

Abstract

PURPOSE:To provide desired gas barrier quality by vacuum forming a plastic film manufactured through a duplicate extrusion method to manufacture a vessel for covering a core material for use as a vacuum insulation pack having a cover material of a plastic film. CONSTITUTION:A multilayer film 3 formed via a duplicate extrusion method is vacuum formed to prepare a vessel 4. Also, a barrier material 8 made of a plastic-metal foil laminate film 7 and an adsorbing agent 9 are stacked and laid between a core material of hard urethane foam and the vessel 4. Then, a cover material 6 is formed out of a plastic-metal foil laminate film 5 and the vessel 4 is closed therewith. The multilayer film 3 has an outermost layer of a chemical resistant film, an intermediate layer of a gas barrier film and an innermost layer of a chemical resistant film. Furthermore, the innermost and outermost layers of the films 5 and 7 are also made of a chemical resistant film, and the intermediate layer thereof is made of aluminum foil or the like.

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 In recent years, as a heat insulating material used for a heat insulating box of a refrigerator, a foam heat insulating material and a vacuum heat insulating material pack having a better heat insulating property have been used together to provide a high heat insulating property.

However, when the vacuum heat insulating material pack is attached to the heat insulating box, a space is created between the peripheral edge of the vacuum heat insulating material pack and the wall surface of the heat insulating box.

As a result, cavities are formed when the heat insulating box is filled with the foamed heat insulating material, which causes shrinkage and has a problem in appearance quality.

As means for solving such a problem, there is one disclosed in Japanese Patent Laid-Open No. 63-203089.

The contents described in JP-A-63-203089 will be described with reference to FIGS. 3 and 4. In the figure, 20 is a vacuum heat insulating material pack, which is a container 21 made of a laminate film having a gas barrier property and a core material 22 having an open cell structure.
And a lid member 23 made of a laminate film having a gas barrier property, and the container 21 and the lid member 23 are superposed on each other and are heat-sealed on both flat portions.

Since the vacuum heat insulating material pack 20 having such a structure is attached to the inner surface side of the outer box 24 with the lid 23 side as an adhesive surface, the vacuum heat insulating material pack 20 and the outside There is no space between it and the box 24.

As a result, the foam insulation 25 is attached to the insulation box 26.
It is possible to obtain a heat-insulating box 26 of stable product quality, which is free from the formation of voids when it is filled with.

[0009]

However, in the case of the above-mentioned conventional vacuum heat insulating material pack, since the vacuum heat insulating material pack is formed into a container shape, the elongation rate of the material is large and the thickness of the corners and the like is thin, which is desirable. There was a problem that the gas barrier property of was not obtained.

To solve this problem, attempts have been made to thicken the barrier layer film. However, in the case of a laminating film, the film thickness that is industrially produced at a low cost is limited, and in order to obtain a desired thickness of the barrier layer, there is only a method of laminating a film having a general thickness into multiple layers. .

Therefore, there has been a problem of quality deterioration such as an increase in cost due to an increase in the number of processing steps and an increase in internal gas pressure due to an increase in the amount of gas generated by the adhesive due to an increase in the number of adhesive layers, resulting in deterioration of heat insulation performance. .

Further, in the case of forming a container, if a film having rigidity is used, it is easy to maintain the shape after molding, and the workability of filling the core material into the container is improved and the productivity is improved.
In the case of a laminate manufacturing method, if a film having high rigidity is used, the adhesion between the resin layers deteriorates,
There has been a problem that a large number of wrinkles are generated on the film and it cannot be used as a film.

[0013]

In order to solve the above-mentioned conventional problems, a vacuum heat insulating material pack according to the present invention comprises a core material, a container formed by vacuum molding a plastic film for covering the core material, and a plastic film. In the vacuum heat insulating material pack configured by the lid material, the plastic film of the container is a vacuum heat insulating material pack made of a plastic film manufactured by a co-extrusion method.

Further, the vacuum heat insulating material pack of the present invention comprises a core material, a container formed by vacuum-molding a plastic film for covering the core material, a lid material made of a plastic-metal foil film, and a plastic-metal foil. In a vacuum heat insulating material pack composed of a barrier material made of a film and an adsorbent, the plastic film of the container is a vacuum heat insulating material pack which is a plastic film manufactured by a co-extrusion method.

[0015]

With the above structure, since the plastic film of the container is a plastic film manufactured by the co-extrusion method, there is no manufacturing restriction on the film thickness, and the resin layer having a desired thickness can be easily formed at an industrial cost. can do.

Further, since it is a co-extrusion method, it is not necessary to provide an adhesive between the films, and in the case of a multi-layer structure, the problem of deterioration of heat insulation performance due to an increase in internal pressure can be solved.

Further, by applying the co-extrusion method, since the resins are laminated in a layered state in a semi-molten state, there is no problem in the adhesion between the resin layers, and problems such as wrinkling in the application of highly rigid resin can be solved. It is.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In the figure, reference numeral 1 denotes a vacuum heat insulating material pack, a core material 2 made of a rigid urethane foam having an open cell structure, and a multilayer structure film 3 obtained by a coextrusion method.
Vacuum-molded container 4 and plastic-metal foil laminate
It is composed of a lid member 6 made of a plastic film 5, a barrier member 8 made of a plastic-metal foil laminated film 7, and an adsorbent 9.

The multilayer structure film 3 has a constitution in which the outermost layer 10 is a resin layer 11 made of polypropylene resin or the like having a thickness of 100 μ having excellent chemical resistance, and the middle layer 12 is ethylene having a thickness of 100 μ having excellent gas barrier properties. Resin layer 13 and innermost layer 14 made of vinyl alcohol resin or the like
And a resin layer 15 made of a polypropylene resin having a thickness of 100 μ, which is excellent in chemical resistance, and is laminated by a co-extrusion method to obtain a multilayer plastic film.

The plastic-metal foil laminating films 5 and 7 are composed of a plastic film 17 made of polypropylene resin having a thickness of 20 .mu.m, which is excellent in chemical resistance, for the outermost layer 16, and an aluminum film having a thickness of 7 .mu.m for the middle layer 18. A metal foil 19 made of foil and a plastic film 21 made of polypropylene resin having a thickness of 20 μ, which is excellent in chemical resistance, are applied to the innermost layer 20, and they are bonded to each other to form a laminate film. .

Then, the barrier material 8 is attached to the inner bottom surface of the container 4 by a method such as heat sealing, the core material 2 and the adsorbent 9 are filled in the container 4, and the inside pressure is reduced. Then, the vacuum heat insulating material pack 1 is hermetically sealed with the lid member 6.
To get

With the above structure, since the container 4 of the vacuum heat insulating material pack 1 is the multilayer plastic film produced by the coextrusion method, it becomes possible to easily form the resin layer having a desired thickness. Can be manufactured at low cost.

Further, since the adhesive is unnecessary, it is possible to solve the deterioration of the heat insulation performance due to the increase in the internal pressure of the pack due to the gas release from the adhesive.

Furthermore, since the resins are laminated in a layered state in a semi-molten state, the adhesion between the resin layers is not a problem, and problems such as wrinkling in the application of highly rigid resin can be solved.

The core material 2 is made of powder having a low pressure dependency.
In this case, there is no problem in performance even if the adsorbent 9 and the barrier material 8 are removed and the lid material 6 is formed into a vapor-deposited plastic film or a plastic film.

[0027]

INDUSTRIAL APPLICABILITY As described above, the present invention provides a vacuum heat insulating material pack comprising a core material, a container formed by vacuum molding a plastic film for covering the core material, and a lid material made of the plastic film. Since the plastic film of the container is a vacuum heat insulating material pack made of a plastic film produced by a co-extrusion method, it becomes possible to easily form a resin layer having a desired thickness, which is industrially inexpensive to produce. It is possible.

Further, since the manufacturing method is a co-extrusion method, an adhesive is not required, and the deterioration of the heat insulating performance due to the rise of the internal pressure of the pack due to the gas release from the adhesive can be solved.

Further, since the resins are laminated in a layered state in a semi-molten state, there is no problem in adhesion between the resin layers, and problems such as wrinkling in the application of highly rigid resin can be solved.

[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 a detailed sectional view of a vacuum heat insulating material pack according to an embodiment of the present invention.

FIG. 3 is a sectional view of a conventional vacuum heat insulating material pack.

FIG. 4 is an enlarged sectional view of a main part of a conventional heat insulating box.

[Explanation of symbols]

 1 Vacuum insulation material pack 2 Core material 6 Container 7 Lid material 8 Barrier material 9 Adsorbent

Claims (2)

[Claims] 1. A vacuum heat insulating material pack comprising a core material, a container formed by vacuum forming a plastic film for covering the core material, and a lid material made of the plastic film, wherein the plastic film of the container is Vacuum insulation pack, which is a plastic film manufactured by the co-extrusion method. 2. A core material, a container formed by vacuum-molding a plastic film for covering the core material, a lid material made of plastic-metal foil film, a barrier material made of plastic-metal foil film, and an adsorbent. The vacuum insulation material pack according to claim 1, wherein the plastic film of the container is a plastic film manufactured by a co-extrusion method.