JPH05215293A - Manufacture of vacuum heat insulating pack - Google Patents

Abstract

PURPOSE:To manufacture a vacuum heat insulating pack stabilized in performance which can be used as a heat insulating member for a refrigerator. CONSTITUTION:A vacuum heat insulating pack is made up of a vacuum forming means forming an object into a container shape; a vacuum chamber 3 equipped with a heat laminating means 5 for installing a barrier member 4 by means of heat lamination under vacuum environment; and of a vacuum chamber 7 equipped with a chuck means 9 for heat sealing each peripheral section while tension is being applied to either one of a cover member 8 composed of a plastic laminate film and a forming member 1 or to both of them, and with a heat sealing means 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a vacuum heat insulating material pack which can be used as a heat insulating material for a refrigerator or 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 in combination to provide a high heat insulating property.

However, when the vacuum heat insulating material pack is attached to the heat insulating box body, a space is created between the peripheral portion of the vacuum heat insulating material pack and the wall surface of the heat insulating box body, and the heat insulating box body is filled with the foam heat insulating material. Occasionally, cavities were formed, which caused shrinkage and had 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. 5 and 6. In the figure, 12 is a vacuum heat insulating material pack, which is a container 13 made of a laminate film having a gas barrier property and a core material 14 having an open cell structure.
And a lid member 15 made of a laminate film having a gas barrier property, and the container 13 and the lid member 15 are superposed and heat-sealed on both flat portions.

Since the vacuum heat insulating material pack 12 having the above-mentioned structure is attached to the inner surface side of the outer box 16 with the lid 15 side as an adhesive surface, the vacuum heat insulating material pack 12 and the outer heat insulating box 18 are attached. There is no space between the heat insulating box 18 and the box 16, there is no cavity when the heat insulating box 18 is filled with the foam heat insulating material 17, and a heat insulating box 18 of stable product quality without shrinkage can be obtained.

[0007]

However, in the production of the conventional vacuum heat insulating material pack, when a container is formed using a laminate film having gas barrier properties, the laminate film is formed into a container shape by vacuum forming. However, when a laminate film having a metal foil such as an aluminum foil is used to improve the barrier property, the metal foil such as the aluminum foil has a remarkably poor moldability, so that the container is vacuum-formed. When it is formed into a shape, there is a problem that the laminate film is partially torn or a large number of wrinkles are generated so that the heat seal cannot be performed.

If the laminate film is formed into a container by vacuum forming and then the laminate film having a metal foil such as aluminum foil is attached by heat laminate or the like, the vacuum formability does not cause any problem and can be easily performed. Although it becomes possible to make the laminate film into a container shape, when a laminate film having a metal foil such as an aluminum foil is attached to a vacuum formed container, a method such as an adhesive or heat laminate is used. However, since a large amount of air is present at the adhesive interface, the air in the adhesive interface diffuses inward with the passage of time, and there is a problem that the heat insulation performance deteriorates due to a significant decrease in the degree of vacuum. It was

Further, when the container and the lid member obtained by vacuum forming are attached by a heat seal, since the container and the sheet-like lid member have different degrees of deformation due to heat, the heat seal is applied. There has been a problem that wrinkles are partially generated at the interface and the heat-sealing property becomes insufficient, causing a slow leak from this portion.

[0010]

In order to solve the above-mentioned conventional problems, a method of manufacturing a vacuum heat insulating material pack according to the present invention comprises a vacuum forming machine for forming a plastic laminate film into a container shape, and a container forming shape. A vacuum chamber provided with a heat laminate machine for attaching a plastic-metal foil laminate film barrier material by heat laminate in a vacuum atmosphere to a part of the formed molding material, and the barrier material. A core material having excellent heat insulation performance is filled inside the molding material attached by heat-laminate, and a peripheral edge while applying a tension to either or both of the lid material made of a plastic laminate film and the molding material. A method for manufacturing a vacuum heat insulating material pack, which is manufactured by a chuck machine for performing a heat seal of a part and a vacuum chamber equipped with the heat seal machine.

[0011]

With the above structure, since the barrier material made of the plastic-metal foil laminate film is attached to the part of the molding material in the vacuum atmosphere by the heat laminate, gas such as air is not present at the bonding interface, The problem that the degree of vacuum is lowered and the heat insulation performance is deteriorated is solved.

Even when the molding material and the lid material are attached to each other by a heat seal, the heat sealing is performed while applying tension to either or both of the lid material and the molding material. , There is no wrinkle on the heat seal surface,
It is possible to obtain a vacuum heat insulating material pack without a slow leak.

As a result of these, it becomes possible to manufacture a vacuum heat insulating material pack of stable quality.

[0014]

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 the figure, reference numeral 1 denotes a molding material made of a plastic laminate film, which is molded into a container by a vacuum molding machine 2.

After that, the molding material 1 is placed in the vacuum chamber-3, the inside of the vacuum chamber-3 is decompressed, and the barrier material 4 made of a plastic-metal foil laminate film.
Is adhered to the inner surface of the molding material 1 by a heat laminate machine 5 provided in the vacuum chamber-3.

After that, the core material 6 of continuous hard urethane foam is filled in the inside of the molding material 1 to which the barrier material 4 is adhered, and the core material 6 is placed in the vacuum chamber 7, and then the plastic laminate film is used. After decompressing the inside of the vacuum chamber without applying tension to the lid member 8 by the chuck machine 9, the joint surface between the molding material 1 and the lid member 8 is provided in the vacuum chamber-7. -Heat seal is performed by the roll machine 10.

The vacuum heat insulating material pack 11 obtained by such a manufacturing method has no air or the like at the bonding interface between the molding material 1 and the barrier material 4. The problem that the degree of vacuum is lowered and the heat insulation performance is deteriorated by diffusion and penetration is solved.

Further, since the cover material 8 is heat-sealed with the molding material 1 while applying tension, it is possible to prevent the cover material 8 from shrinking significantly from the molding material 1 due to heat,
There is no wrinkle in the heat seal, and the problem of slow leak caused by this is solved.

The method of applying tension to the lid member 8 is not limited to the method using the chuck machine 9, and other methods may be used, and the lid member 8 and the molding material may be used. Regarding the method of heat-sealing No. 1 and No. 1, before performing the heat-sealing in the vacuum chamber 7,
While pretensioning the lid member 8 in advance, the two opposite sides are hit
It is also possible to perform a toe-seal, then install in the vacuum chamber 7 to depressurize the inside, and then heat-seal the remaining two opposite sides.

As a method other than applying a tension to the lid member 8, the same effect can be obtained by applying a tension only to the molding material 1 or applying a tension to both the lid material 8 and the molding material 1. Is obtained.

[0021]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, a vacuum forming machine for forming a plastic laminate film into a container shape, and a barrier comprising a plastic-metal foil laminate film as a part of the container-formed forming material. Heat mine for attaching material by heat mine in vacuum atmosphere
A vacuum chamber equipped with a molding machine, and a molding material in which the barrier material is attached by heat laminate is filled with a core material having excellent heat insulation performance, and a lid material made of a plastic laminating film and the molding material. A vacuum chamber equipped with a chuck machine and a heat seal machine for performing a heat seal on the peripheral portion while applying a tension to one or both of the materials.
Since it is a method of manufacturing a vacuum insulation material pack that is manufactured by, there is no air or the like at the bonding interface between the molding material and the barrier material. The problem that the degree of vacuum is lowered due to the diffusion and permeation and the heat insulation performance is deteriorated due to this is solved.

Further, since the periphery is heat-sealed while tension is applied to either or both of the lid material and the molding material, the heat treatment is performed depending on the difference in the degree of thermal deformation between the lid material and the molding material. The problem that wrinkles are generated in a part of the roll portion and the heat-sealing property is insufficient, which causes a sloak, is solved.

As a result, it becomes possible to manufacture a vacuum heat insulating material pack having a stable quality.

[Brief description of drawings]

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

FIG. 2 is a sectional view of a vacuum heat insulating material pack according to an embodiment of the present invention.

FIG. 3 is a sectional view showing a manufacturing process of a vacuum heat insulating material pack according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a manufacturing process of a vacuum heat insulating material pack according to an embodiment of the present invention.

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

FIG. 6 is an enlarged sectional view of a main part of a conventional heat insulating box.

[Explanation of symbols]

 1 Molding Material 4 Barrier Material 6 Core Material 7 Vacuum Chamber-8 Lid Material 9 Chuck Machine 10 Heat Seal Machine

Claims (1)

[Claims] 1. A vacuum forming machine for forming a plastic laminate film into a container shape, and a barrier material made of a plastic-metal foil laminate film as a part of the container-shaped forming material in a vacuum atmosphere. And a vacuum chamber equipped with a heat laminate machine for attaching by a tramine, and the core material excellent in heat insulation performance is filled inside the molding material in which the barrier material is attached by a heat laminate. A vacuum provided with a chuck machine and a heat seal machine for performing a heat seal on the peripheral portion while applying a tension to one or both of the lid material made of a plastic laminate film and the molding material. A method of manufacturing a vacuum insulation material pack manufactured by a chamber.