JP2723679B2 - Manufacturing method of container for vacuum insulation - Google Patents

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 used, for example, in refrigerators and freezers, and more particularly, to a vacuum heat insulating material for improving the heat insulating performance between the inside and the outside of a refrigerator. It relates to a manufacturing method.

[0002]

2. Description of the Related Art Generally, for example, in a refrigerator or a freezer,
Insulation between the inside and the outside of the refrigerator is an important factor for improving the refrigeration capacity and the freezing capacity. Therefore, in order to improve the heat insulation performance of a refrigerator or the like, a flat vacuum heat insulating material 2A is attached to the inner surface of an outer box 1 of the refrigerator or the like as shown in FIG.

[0003] The container 3 and the container lid 4 of this vacuum heat insulating material 2A are generally formed of a film having a synthetic resin layer for heat sealing inside. Then, the heat insulating spacer material 6 filled in the inner bag 5 is stored in the container 3 and is covered with the container lid 4. Next, the inside of the container 3 is evacuated,
The synthetic resin layers of the outer edges 3a and 4a of the container 3 and the container lid 4 are formed by heat sealing. However, in a film having a synthetic resin layer, since air, water vapor, and the like penetrate and penetrate, the gas barrier property is poor, the degree of vacuum in the container 3 is reduced, and the heat insulation performance is reduced.

For this reason, as shown in FIG. 6, a recent vacuum heat insulating material 2B has a film having a synthetic resin layer 8 for heat sealing inside a metal foil 7 and a metal-deposited synthetic resin layer 9 outside. Then, the container 10 and the container lid 11 are formed. And
The heat insulating spacer material 6 filled in the inner bag 5 is stored in the container 10 and is covered with the container lid 11. Next, the inside of the container 10 is evacuated, and the synthetic resin layers 8, 8 of the outer edges 10a, 11a of the container 10 and the container lid 11 are heat-sealed. When the metal foil 7 is used on the entire surface of the container 10, the gas barrier property is good, the degree of vacuum in the container 10 is maintained, and the heat insulating performance is improved.

[0005]

However, the thermal conductivity of the metal foil 7 is much higher than that of a synthetic resin or the like. For this reason, a thermal bridge is formed in the vicinity of the forehead portion 10c of the container 10, and from the outer box 1, the flat portion 11b of the container lid 11 → the outer edge portion 1
1a (heat seal portion) → outer edge portion 10a (heat seal portion) of container 10 → peripheral portion 10b → forehead portion 10c → flat portion 1
There is a problem that heat is conducted on the surface in the order of 0d, and the initial heat insulation performance is reduced. In addition, the part which becomes a thermal bridge, especially the outer edge part 10a of the container 10, the peripheral part 10b, and the forehead part 10c
It is conceivable that the metal foil 7 is removed from the substrate to block heat conduction. However, the metal foil 7 is only the flat portion 10d of the container 10, and the outer edge portion 10a, the peripheral edge portion 10b, and the forehead portion 10c
Since the gas barrier properties of the container 10 deteriorate, the degree of vacuum in the container 10 decreases, and the heat insulation performance decreases.

Accordingly, an object of the present invention is to provide a method of manufacturing a vacuum heat insulating material container in which both gas barrier properties and heat insulating performance are improved.

[0007]

In order to achieve the above object, a method for manufacturing a vacuum heat insulating material container according to the present invention has a synthetic resin layer for heat sealing inside a metal foil and a metal vapor-deposited synthetic material outside. A container and a container lid are formed from a film having a resin layer, a heat insulating spacer material is housed in the container, the container lid is closed, the inside of the container is evacuated, and the synthetic resin on the outer edge of the container and the container lid is formed. A method for producing the above-mentioned container of vacuum heat-insulating material in which a layer is heat-sealed, wherein a detachable perforation is previously placed in a metal foil of the film along a portion where a forehead portion around the heat-insulating spacer material is located. When the film is formed into a container by compressed air / vacuum forming, the metal foil is naturally cut off at the perforation while the synthetic resin layers of the forehead portion of the container located around the heat insulating spacer material are being stretched. Forehead It is characterized in that the metal foil is to be removed.

[0008]

In the container manufactured by the manufacturing method of the present invention, since the metal foil on the forehead of the container has been removed, a thermal bridge is not formed on the forehead of the container, and the outer edge and the peripheral edge of the container are in contact with each other. The surface heat conduction with the flat part is cut off, and the initial heat insulating performance can be maintained. In addition, since the removed portion of the metal foil is formed in a closed space between the synthetic resin layer for heat sealing and the metal-deposited synthetic resin layer, foreign matter enters the removed portion of the metal foil and forms a thermal bridge again. Since there is no danger, the initial heat insulation performance can be reliably maintained. Further, since the metal foil is removed only from the forehead of the container, the gas barrier property is maintained, the degree of vacuum is maintained in the container, and the heat insulating performance is improved. In addition, the present invention removes the metal foil on the forehead of the container when the film is formed into a container by pressurized air / vacuum forming, whereby the metal foil is cut off naturally at the perforation. The metal foil can be easily and reliably removed from the forehead of the container, and the container can be easily manufactured.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in FIGS. 5 and 6 are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIG. 1, the vacuum heat insulating material 16 has a synthetic resin layer 8 for heat sealing inside a metal foil 7,
It has a container 10 formed of a film F having a metal-deposited synthetic resin layer 9 on the outside, and a container lid 11. This container 10
, The heat insulating spacer material 6 filled in the inner bag 5 is housed and covered with the container lid 11. Then, the inside of the container 10 is evacuated, and the synthetic resin layers 8, 8 of the outer edges 10a, 11a of the container 10 and the container lid 11 are heat-sealed to produce the vacuum heat insulating material 16.

The metal foil 7 of the forehead portion 10c is removed from the outer edge portion 10a (heat seal portion), the peripheral edge portion 10b, the forehead portion 10c and the flat portion 10d of the container 10, and the metal foil removal portion is provided on the forehead portion 10c. 10e are formed.

With this configuration, the metal foil removing unit 10
By e, no thermal bridge is formed in the forehead portion 10c of the container 10. Therefore, the heat conduction between the outer edge portion 10a and the peripheral edge portion 10b of the container 10 and the flat portion 10d is reduced by the metal foil removing portion 1.
It is shut off at 0e. Since the metal foil removing portion 10e is formed in a closed space between the synthetic resin layer 8 for heat sealing and the metal-deposited synthetic resin layer 9, the metal foil removing portion 10e is formed.
There is no danger of foreign matter entering e and forming a thermal bridge again. As a result, the initial heat insulating performance can be maintained. Moreover,
The metal foil 10 is removed from the forehead 10 of the container 10.
Since it is only c, the gas barrier property is practically sufficiently maintained at the outer edge portion 10a, the peripheral edge portion 10b, and the flat surface portion 10d, so that the degree of vacuum in the container 10 is also maintained and the heat insulating performance is improved.

The metal foil removing portion 10e of the container 10 can be easily and reliably provided by the following method.

First, as shown in FIG. 2, a separable perforation 7a is previously placed in the metal foil 7 along the portion where the forehead portion 6a of the heat insulating spacer material 6 is located. Then, as shown in FIG. 3, a synthetic resin layer 8 for heat sealing is laminated on the inner side of the metal foil 7 and a metal-deposited synthetic resin layer 9 is laminated on the outer side, thereby producing a film F.

Next, the film F is set on the compressed air / vacuum forming mold 15 with the outer synthetic resin layer 9 facing the concave portion 15a. Then, the concave portion 15a of the mold 15 is formed.
.. 15b, the film F is dented along the concave portion 15a of the mold 15 to form the container 10, as shown in FIG.

When the container 10 is formed, the perforations 7a of the metal foil 7 are naturally cut off while the synthetic resin layers 8 and 9 of the frame 10c of the container 10 are being stretched. The metal foil 7 is removed from 10b, and the metal foil removal part 10e is automatically formed.

[0017]

As is apparent from the above description, the method for manufacturing a container for vacuum heat insulating material of the present invention is such that the metal foil is removed from the forehead of the container. No bridge is formed. Thereby, since the surface heat conduction between the outer edge and the peripheral edge of the container and the flat portion is interrupted,
The vacuum heat insulating material provided with this container can maintain the initial heat insulating performance. In addition, since the removed portion of the metal foil is formed in a closed space between the synthetic resin layer for heat sealing and the metal-deposited synthetic resin layer, foreign matter enters the removed portion of the metal foil and forms a thermal bridge again. Since there is no danger, the initial heat insulation performance can be reliably maintained. Further, since the metal foil is removed only at the forehead of the container, the gas barrier property is maintained, the degree of vacuum in the container is maintained, and the heat insulating performance is improved. Furthermore, the method for manufacturing a container for vacuum heat insulating material of the present invention is such that when a film is formed into a container, the metal foil on the forehead of the container is automatically removed, so that the metal foil can be easily and quickly removed from the forehead of the container. Can be removed, making the container easier to manufacture.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a vacuum insulating material provided with a container manufactured by a method according to the present invention.

FIG. 2 is a plan view of a metal foil.

FIG. 3 is a sectional view of a mold on which a film is set.

FIG. 4 is a cross-sectional view of a mold for molding a container.

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

FIG. 6 is a sectional view of a main part of a conventional vacuum heat insulating material.

[Explanation of symbols]

6: heat insulating spacer material, 6a: forehead, 7: metal foil, 8: synthetic resin layer for heat sealing, 9: metal vapor-deposited synthetic resin layer,
DESCRIPTION OF SYMBOLS 10 ... Container, 10a, 11a ... Outer end part, 10b ... Peripheral part, 10c ... Forehead part, 10d ... Flat surface part, 10e ... Metal foil removal part, 11 ... Container lid, 15 ... Mold for air pressure / vacuum forming, 1
6 ... Vacuum insulation, F ... Film.

Claims (1)

(57) [Claims] 1. A container and a container lid are formed from a film having a synthetic resin layer for heat sealing inside a metal foil and a metal vapor-deposited synthetic resin layer on the outside, and a heat insulating spacer material is stored in the container. A method for producing the above-mentioned container of vacuum heat insulating material in which the container is covered with a container lid, and the inside of the container is evacuated, and the container and the synthetic resin layer on the outer edge of the container lid are heat-sealed. When a film is formed into a container by pressurized / vacuum forming, a perforation is cut in advance along a portion where the forehead around the heat insulating spacer material is located, and the frame of the container positioned around the heat insulating spacer material is formed. In the course of elongating each synthetic resin layer of the part, the metal foil is naturally cut off at the perforation, so that the metal foil of the forehead part of the container is removed. Production method.