JPH04257685A - Vacuum thermal insulation material and manufacture of container for vacuum thermal insulation material - Google Patents

Abstract

PURPOSE:To improve a gas barrier characteristic and a thermal insulating performance of a vacuum thermal insulating material. CONSTITUTION:A metallic foil 7 at a frame part 10c of a vacuum thermal insulating container 10 is removed. A thermal bridge is not formed at the frame 10c and a surface thermal transfer between an outer edge 10a and a flat surface part 10d of the container 10 is shielded. Metallic foil 7 is removed only at the frame part 10c, so that its gas barrier characteristic is also maintained. When a film F is formed at the container 10 under application of vacuum and vacuum formation, the metallic foil 7 is naturally cut off at perforations, thereby metallic foil 7 at the frame 10c is removed and the metallic foil removing part 10e is automatically formed.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a vacuum insulation material used for example in refrigerators and freezers, and more specifically to a vacuum insulation material and a vacuum insulation material for improving the insulation performance between the inside and outside of the refrigerator. This invention relates to a method for manufacturing a container.

0002

[Prior Art] Generally, for example, in a refrigerator or a freezer,
Insulation between the inside and outside of a refrigerator is an important element for improving refrigeration and 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] This vacuum heat insulating material 2A is generally made by molding the container 3 and the container lid 4 from a film having a synthetic resin layer for heat sealing on the inside. Then, the heat insulating spacer material 6 filled in the inner bag 5 is stored in this container 3 and covered with a container lid 4. Next, while vacuuming the inside of the container 3,
It is constructed by heat-sealing synthetic resin layers on the outer edges 3a, 4a of the container 3 and container lid 4. However, in a film having a synthetic resin layer, air, water vapor, etc. permeate and enter, resulting in poor gas barrier properties, a decrease in the degree of vacuum inside the container 3, and a decrease in heat insulation performance.

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

[0005]

[Problems to be Solved by the Invention] However, the thermal conductivity of the metal foil 7 is much higher than that of synthetic resin or the like. Therefore, a thermal bridge is formed near the forehead 10c of the container 10, and from the outer box 1, the flat part 11b of the container lid 11 → the outer edge 11
a (heat sealing part) → outer edge part 10a of container 10 (heat sealing part) → peripheral part 10b → forehead part 10c → flat part 10
There was a problem in that heat was conducted to the surface in the order of d, and the initial insulation performance deteriorated. Note that it is possible to remove the metal foil 7 from the portions that will become thermal bridges, particularly the outer edge 10a, peripheral edge 10b, and frame 10c of the container 10 to block heat conduction. However, the metal foil 7 is present only on the flat part 10d of the container 10, and the gas barrier properties of the outer edge 10a, peripheral edge 10b, and forehead 10c deteriorate, so the degree of vacuum inside the container 10 decreases, and the insulation performance decreases. do.

[0006] Accordingly, an object of the present invention is to provide a vacuum heat insulating material and a method for manufacturing a container for a vacuum heat insulating material, which improve both gas barrier properties and heat insulation performance.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the invention of claim 1 provides a film having a heat-sealing synthetic resin layer on the inside of the metal foil and a metal-deposited synthetic resin layer on the outside. A container and a container lid were formed by molding the container, a heat insulating spacer material was placed in the container, and the container lid was used to cover the container.The inside of the container was evacuated, and the synthetic resin layer on the outer edge of the container and container lid was heat-sealed. The vacuum heat insulating material is characterized in that part or all of the metal foil on the frame of the container located around the heat insulating spacer material is removed.

[0008] The invention according to claim 2 is a method for manufacturing the container according to claim 1, in which the metal foil of the film is provided with a separable material along the portion where the frame portion around the heat insulating spacer material is located. When perforations are made in advance and the film is formed into a container by air pressure/vacuum forming, the metal foil naturally forms at the perforations while each synthetic resin layer on the frame of the container located around the heat insulating spacer material is being stretched. separated,
A feature is that the metal foil on the forehead of the container is removed.

[0009]

[Operation] According to the first aspect of the invention, the metal foil on the forehead of the container is removed. Therefore, a thermal bridge is no longer formed in the frame portion of the container, and surface heat conduction between the outer edge and peripheral portion of the container and the plane portion is blocked, and the initial heat insulation performance can be maintained. Furthermore, since the removed portion of the metal foil is formed in a sealed space between the synthetic resin layer for heat sealing and the metal vapor-deposited synthetic resin layer, foreign matter may enter the removed portion of the metal foil and form a thermal bridge again. Since there is no risk of this happening, the initial insulation performance can be maintained reliably. Furthermore, since the metal foil is removed only from the frame of the container, gas barrier properties are maintained, the degree of vacuum is maintained within the container, and the heat insulation performance is improved. On the other hand, the invention of claim 2 is such that when the film is formed into a container by air pressure/vacuum forming, the metal foil is naturally separated at the perforations, thereby removing the metal foil from the frame of the container. be. Therefore, the metal foil can be easily and reliably removed from the frame of the container, and the container can be manufactured easily.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below with reference to embodiments shown in FIGS. 1 to 4. Note that parts having the same configuration and operation as those of the prior art in FIGS. 5 and 6 are given the same numbers and detailed explanations are omitted.

As shown in FIG. 1, the vacuum heat insulating material 16 has a synthetic resin layer 8 for heat sealing inside the metal foil 7.
It has a container 10 and a container lid 11 formed of a film F having a metal vapor-deposited synthetic resin layer 9 on the outside. This container 10
In this case, a heat insulating spacer material 6 filled in an inner bag 5 is stored and covered with a container lid 11. Then, the vacuum heat insulating material 16 is manufactured by evacuating the inside of the container 10 and heat-sealing the synthetic resin layers 8, 8 on the outer edges 10a, 11a of the container 10 and the container lid 11.

Of the outer edge 10a (heat-sealed portion), peripheral edge 10b, frame 10c, and flat surface 10d of the container 10, the metal foil 7 of the frame 10c is removed, and a metal foil removed portion is formed on the frame 10c. 10e is formed.

With this configuration, the metal foil removing section 10
By e, a thermal bridge is no longer formed in the frame portion 10c of the container 10. Therefore, heat conduction between the outer edge 10a and the peripheral edge 10b of the container 10 and the flat surface 10d is limited to the metal foil removed portion 1.
It is cut off at 0e. Further, since the metal foil removing portion 10e is formed in a sealed space between the heat sealing synthetic resin layer 8 and the metal vapor deposited synthetic resin layer 9, the metal foil removing portion 10e
There is no risk of foreign matter entering e and forming a thermal bridge again. As a result, the initial heat insulation performance can be maintained. Moreover,
The metal foil 10 is removed from the forehead 10 of the container 10.
c, the gas barrier properties are maintained sufficiently in practical use at the outer edge portion 10a, the peripheral edge portion 10b, and the flat portion 10d, so that the degree of vacuum inside the container 10 is also maintained, and the heat insulation performance is also improved.

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

First, as shown in FIG. 2, a perforation 7a is made in advance in the metal foil 7 along the portion where the frame portion 6a of the heat insulating spacer material 6 is located. Then, as shown in FIG. 3, a heat-sealing synthetic resin layer 8 is laminated on the inside of this metal foil 7, and a metal vapor-deposited synthetic resin layer 9 is laminated on the outside to produce a film F.

Next, this film F is set on the air pressure/vacuum forming mold 15 with the outer synthetic resin layer 9 facing toward the recess 15a. After that, the recess 15a of the mold 15
When the air is exhausted from the exhaust holes 15b, .

When molding this container 10, 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 the metal foil 10b, and a metal foil removed portion 10e is automatically formed.

[0018]

As is clear from the above description, since the vacuum heat insulating material of claim 1 is obtained by removing the metal foil from the frame of the container, no thermal bridge is formed in the frame. This blocks surface heat conduction between the outer edge and peripheral edge of the container and the flat surface, so that the initial heat insulation performance can be maintained. Furthermore, since the removed portion of the metal foil is formed in a sealed space between the synthetic resin layer for heat sealing and the metal vapor-deposited synthetic resin layer, foreign matter may enter the removed portion of the metal foil and form a thermal bridge again. Since there is no risk of this happening, the initial insulation performance can be maintained reliably. Further, since the metal foil is removed only from the frame portion of the container, the gas barrier properties are maintained, the degree of vacuum inside the container is maintained, and the heat insulation performance is improved. On the other hand, in the method of manufacturing a vacuum insulation container according to the second aspect of the present invention, the metal foil on the frame of the container is automatically removed when the film is formed into the container. This facilitates the manufacture of the container, since the metal foil can be removed easily and quickly from the frame of the container.

[Brief explanation of the drawing]

[Figure 1] Cross-sectional view of essential parts of the vacuum insulation material according to the present invention

[Figure 2] Plan view of metal foil

[Figure 3] Cross-sectional view of the mold with the film set

[Figure 4
] Cross-sectional view of the mold used to form the container

[Figure 5] Cross-sectional view of conventional vacuum insulation material

[Figure 6] Cross-sectional view of main parts of conventional vacuum insulation material

[Explanation of symbols]

6... Heat insulating spacer material, 6a... Frame portion, 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... Frame part, 10d... Flat part, 10e... Metal foil removal part, 11... Container lid, 15... Pressure/vacuum forming mold, 16
...Vacuum insulation material, F...film.

Claims (2)

[Claims] Claim 1: A container and a container lid are formed from a film having a heat-sealing synthetic resin layer on the inside of metal foil and a metal vapor-deposited synthetic resin layer on the outside, and a heat insulating spacer material is housed in the container. In the vacuum insulation material, which is covered with a container lid, the inside of the container is evacuated, and the synthetic resin layer on the outer edge of the container and the container lid is heat-sealed, the frame of the container located around the insulation spacer material is A vacuum insulation material characterized by having part or all of the metal foil removed. [Claim 2] A container and a container lid are formed from a film having a heat-sealing synthetic resin layer on the inside of the metal foil and a metal vapor-deposited synthetic resin layer on the outside, and a heat insulating spacer material is housed in the container. A method for producing the above-mentioned container made of a vacuum insulation material, which is covered with a container lid, evacuated the inside of the container, and heat-sealed the synthetic resin layer on the outer edge of the container and the container lid, the method comprising: a metal foil of the film; A separable perforation is made in advance along the area around the heat insulating spacer material where the frame is located, and when the film is formed into a container by air pressure/vacuum forming, the frame of the container located around the heat insulating spacer material is cut in advance. The container for vacuum insulation material is characterized in that the metal foil is naturally separated at the perforation while each synthetic resin layer of the container is being stretched, and the metal foil on the frame of the container is removed. Production method.