JP7065437B2 - Manufacturing method of vacuum heat insulating material and vacuum heat insulating material - Google Patents

Description

The present invention relates to the core material and the vacuum heat insulating material, and more particularly to the core material and the vacuum heat insulating material for vacuum packaging with the outer cover material to form the vacuum heat insulating material.

In general, home appliances such as refrigerators and cooking appliances are required to save energy, and in order to meet such energy saving, a high-performance vacuum heat insulating material is used inside the home appliances.
As such a vacuum heat insulating material, conventionally, for example, a core material 2 made of glass wool and a barrier material 4 as an outer cover are formed, and a part of the core material 2 is removed to form a linear thin wall on the core material 2. A technique is disclosed in which the portion 13 is formed so that the completed vacuum heat insulating material 1 can be easily bent by using the thin-walled portion 13 (see, for example, Patent Document 1).

JP-A-2007-092776

In such a conventional technique, a thin wall portion is formed in the core material so that the vacuum heat insulating material can be bent.
However, apart from the bending of the vacuum heat insulating material, when arranging the vacuum heat insulating material in a deformed housing having an uneven shape, it is necessary to process a part of the vacuum heat insulating material having a different thickness according to the housing shape. There may be.

In this case, when forming a portion having a different thickness in a part of the core material, vacuum packaging is performed after the core material is formed before vacuum packaging. As shown in FIG. 8, the vacuum heat insulating material 100 after vacuum packaging is performed. Is subjected to stress due to atmospheric pressure, so that the core material 101 of the thin-walled portion 201 and the stepped portion 202, which are thin in thickness, is deformed, and the original design shape shown by the broken line in FIG. 8 and the shape of the core material 101 are different. There is a problem that it may end up.

Further, when the thin wall portion 201 is to be formed by press working after forming the vacuum heat insulating material 100, the core material density of the portion compressed by the press working becomes higher than the core material density of the portion not pressed. It will end up. If the core material density is not uniform as described above, the thermal conductivity of the high-density portion increases, and the heat insulating effect of the vacuum heat insulating material 100 is reduced.
Further, when the vacuum heat insulating material is subjected to compression processing after vacuum packaging, the volume of the vacuum heat insulating material becomes small, so that the internal pressure rises and the thermal conductivity of the entire vacuum heat insulating material 100 increases.

The present invention has been made in view of the above circumstances, and it is possible to prevent the core material from being deformed during vacuum packaging, and the core material can be vacuum-packed while maintaining the shape of the core material before vacuum packaging. And is intended to provide vacuum heat insulating materials.

In order to achieve the above object, in the present invention, one surface of the core material after vacuum packaging is a first surface, a second surface having a height different from that of the first surface, and the first surface. A third surface formed so as to slop and connect the second surface and the second surface, and the first surface and the surface opposite to the second surface of the core material are one. It is composed of a flat surface, and is characterized in that the density of the core material on the first surface, the second surface, and the third surface is uniform .

According to this, since the third surface connecting the first surface and the second surface in an inclined manner is formed on at least one surface of the core material, the stress due to the atmospheric pressure during vacuum packaging is increased. It will be dispersed by the third surface, and it is possible to prevent deformation due to the stress acting intensively in the thickness direction.
This specification includes all the contents of the Japanese patent application and Japanese Patent Application No. 2018-096943 filed in Japan on May 21, 2018.

According to the present invention, the stress due to atmospheric pressure when vacuum-packing the core material is dispersed by the third surface, and deformation due to the stress acting intensively in the thickness direction is prevented. It becomes possible. As a result, it is possible to obtain the vacuum heat insulating material in a state where the original shape of the design is maintained.

FIG. 1 is a schematic perspective view showing a vacuum heat insulating material to which the core material according to the embodiment of the present invention is applied. FIG. 2 is a schematic perspective view showing the core material of the present embodiment. FIG. 3 is an explanatory diagram showing a means for forming a core material according to the present embodiment. FIG. 4 is an explanatory diagram showing another means for forming the core material of the present embodiment. FIG. 5 is an explanatory diagram showing another means for forming the core material of the present embodiment. FIG. 6 is an explanatory diagram showing another means for forming the core material of the present embodiment. FIG. 7 is an explanatory diagram showing a method of manufacturing the vacuum heat insulating material according to the present embodiment. FIG. 8 is a schematic perspective view showing an example in which a thin-walled portion is formed without providing an inclined portion in a part of the conventional vacuum heat insulating material and vacuum packaging is performed.

The first invention is a core material for a vacuum heat insulating material, wherein at least one surface of the core material before vacuum packaging has a first surface and a second surface having a height different from that of the first surface. It includes a surface and a third surface formed so as to connect the first surface and the second surface in an inclined manner.
According to this, since the third surface connecting the first surface and the second surface in an inclined manner is formed on at least one surface of the core material, the stress due to the atmospheric pressure during vacuum packaging is increased. It will be dispersed by the third surface, and it will be possible to prevent deformation due to the stress acting intensively in the thickness direction. This makes it possible to obtain the vacuum heat insulating material in a state where the original shape of the design is maintained.

In the second invention, the third surface of the core material is inclined in a plane.
According to this, by forming the third surface inclined in a plane, the stress due to the atmospheric pressure in vacuum packaging is dispersed by the third surface, and the stress is concentrated in the thickness direction. It is possible to prevent deformation due to working in a positive manner.

In the third invention, the third surface of the core material is formed so as to be inclined stepwise.
According to this, by forming the third surface inclined in a stepped manner, the stress due to the atmospheric pressure in vacuum packaging is dispersed by the third surface, and the stress is concentrated in the thickness direction. It is possible to prevent deformation due to working on the surface.

The fourth invention is a vacuum heat insulating material using the core material according to any one of claims 1 to 3.
According to this, since the third surface connecting the first surface and the second surface in an inclined manner is formed on at least one surface of the core material, the stress due to the atmospheric pressure during vacuum packaging is increased. It will be dispersed by the third surface, and it will be possible to prevent deformation due to the stress acting intensively in the thickness direction. This makes it possible to obtain the vacuum heat insulating material in a state where the original shape of the design is maintained.

In the fifth aspect of the invention, at least one surface of the core material after vacuum packaging is a first surface, a second surface having a height different from that of the first surface, the first surface and the second surface. A third surface formed so as to connect the surfaces with an inclination thereof is provided, and the density of the core material on the first surface, the second surface, and the third surface is uniform.
According to this, the density of the core material can be made uniform as compared with the case where the vacuum heat insulating material is manufactured and then pressed to form a thin wall portion as in the conventional case, and the heat as designed can be obtained. The conductivity can be secured, and the heat insulating effect of the vacuum heat insulating material can be secured.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic perspective view of the vacuum heat insulating material to which the core material according to the present embodiment is applied. FIG. 2 is a schematic perspective view of the core material.
The vacuum heat insulating material 1 in the present embodiment is, for example, a substantially flat vacuum heat insulating material 1 arranged in a refrigerator, a cooking device, or the like.
As shown in FIG. 1, the vacuum heat insulating material 1 includes a core material 10 and an outer cover material 20 that covers the outside of the core material 10.

The core material 10 is composed of, for example, a heat insulating body made by laminating elastic glass wool. A device that adsorbs water and gas may be mixed in the core material 10.
The core material 10 has a shape in which one surface is formed in a planar shape and the other surface is formed with a step on the way. That is, the other surface of the core material 10 includes the first surface 11, the second surface 12 formed to be lower in height than the first surface 11, and the first surface 11 and the second surface 12. A third surface 13 formed so as to be inclined and connected is provided.
In the present embodiment, the third surface 13 is formed in a planar shape, but is not limited to a planar shape, and may be formed in a curved surface shape, for example.
The third surface 13 is formed with a small inclination angle with respect to the second surface 12, but the present invention is not limited to this, and a certain effect can be expected if the temperature is 90 ° or less.

Next, a method of forming the core material 10 will be described.
3 to 6 are explanatory views showing means for forming the core material 10.
As a first core material forming means, as shown in FIG. 3, the core material 10 is formed to have a rectangular parallelepiped shape of the first core material 10a and a length dimension shorter than that of the first core material 10a, and one end portion thereof. It can be formed by superimposing the second core material 10b formed on the third surface 13 on the surface.

As a second core material forming means, as shown in FIG. 4, the core material 10 is formed with a rectangular parallelepiped first core material 10c and a second core material 10c having a height dimension lower than that of the first core material 10c. A third core material 10e having a third surface 13 formed on the upper surface thereof is combined between the core material 10d of No. 1 and the first core material 10c and the second core material 10d. Can be done.

Further, as a third core material forming means, as shown in FIG. 5, the core material 10 is formed by cutting a part of the rectangular parallelepiped core material 10 (broken line portion in the figure) to form the first surface 11. A core material 10 having a second surface 12 and a third surface 13 can be formed.

As the fourth core material forming means, as shown in FIG. 6, the core material 10 can be formed by laminating the thin plate-shaped core material 10.
It should be noted that these core material forming means are merely examples, and the core material 10 may be formed by any other means.

An outer cover material 20 is provided on the outer peripheral side of the core material 10. As the outer cover material 20, any material may be used as long as it has a gas barrier property and can accommodate the core material 10 and maintain the inside in a vacuum.

FIG. 7 is an explanatory diagram showing a process of manufacturing the vacuum heat insulating material 1.
When the vacuum heat insulating material 1 is manufactured, as shown in FIG. 7A, the core material 10 on which the first surface 11, the second surface 12 and the third surface 13 are formed is formed as described above. do. Then, as shown in FIG. 7 (b), the upper and lower surfaces of the core material 10 are covered with the outer cover material 20, and the outer cover materials 20 are in close contact with each other, and as shown in FIG. 7 (c), a vacuum is applied. The vacuum heat insulating material 1 can be manufactured by pulling and vacuum packaging.

Next, the operation of this embodiment will be described.
When the surface of the core material 10 is coated with the outer cover material 20 and evacuated, the core material 10 is stressed by atmospheric pressure. When a stepped portion is formed in the core material 10, the stress due to atmospheric pressure works intensively in the thickness direction with respect to the vicinity of the stepped portion of the core material 10, that is, in the direction forming 90 ° with respect to the second surface 12. The lower surface of the core material 10 may be pulled by the atmospheric pressure and the tension of the outer cover material 20, and the shape of the core material 10 may be deformed.

In the present embodiment, before vacuum packaging, an inclined third surface 13 connecting the first surface 11 and the second surface 12 is provided in advance on one surface of the core material 10.
Therefore, when stress is applied to the stepped portion due to atmospheric pressure during vacuum packaging, the stress due to atmospheric pressure and the tension due to the outer cover material 20 are horizontally formed by forming an inclination on the third surface 13. It will be dispersed so as to face, and it is possible to make it difficult to concentrate the stress acting in the 90 ° direction with respect to the second surface 12.

As a result, when the outer cover material 20 is covered with the core material 10 and vacuum packaging is performed, the stress due to the atmospheric pressure is dispersed by the third surface 13 without being concentrated in the vicinity of the step, and the stress. It is possible to prevent deformation due to concentrated work in the thickness direction. As a result, the vacuum heat insulating material 1 can be obtained in a state where the original shape of the design is maintained.
Therefore, the density of the core material 10 does not change, the thermal conductivity as designed can be ensured, and the heat insulating effect of the vacuum heat insulating material 1 can be ensured.

As described above, in the present embodiment, at least one surface of the core material 10 before vacuum packaging includes a first surface 11 and a second surface 12 having a height different from that of the first surface 11. , A third surface 13 formed so as to connect the first surface 11 and the second surface 12 in an inclined manner is provided.
According to this, since the third surface 13 that connects the first surface 11 and the second surface 12 in an inclined manner is formed on at least one surface of the core material 10, it is large in vacuum packaging. The stress due to atmospheric pressure is dispersed by the third surface 13, and it is possible to prevent deformation due to the stress acting intensively in the thickness direction. As a result, the vacuum heat insulating material 1 can be obtained in a state where the original shape of the design is maintained.

Further, in the present embodiment, the third surface 13 of the core material 10 is flat and inclined.
According to this, by forming the third surface 13 inclined in a plane shape, the stress due to the atmospheric pressure at the time of vacuum packaging is dispersed by the third surface 13, and the stress is distributed in the thickness direction. It is possible to prevent deformation due to intensive work.

Further, in the present embodiment, at least one surface of the core material 10 after vacuum packaging is a first surface 11, a second surface 12 having a height different from that of the first surface 11, and a first surface. A third surface 13 formed so as to connect the surface 11 and the second surface 12 in an inclined manner is provided, and the core material 10 on the first surface 11, the second surface 12, and the third surface 13 is provided. The density of is uniform.
According to this, the density of the core material can be made uniform as compared with the case where the vacuum heat insulating material 1 is manufactured and then pressed to form a thin wall portion as in the conventional case, as designed. The thermal conductivity can be secured, and the heat insulating effect of the vacuum heat insulating material 1 can be secured.

It should be noted that the present embodiment shows one aspect to which the present invention is applied, and the present invention is not limited to the above-described embodiment.
For example, in the present embodiment, the case where the third surface 13 is a planar inclined surface has been described, but the present invention is not limited thereto. For example, the third surface 13 may be formed so as to be inclined in a stepped manner.
Further, in the above-described embodiment, an example in which one third surface 13 is formed on one surface of the core material 10 has been described, but the present invention is not limited thereto. For example, a plurality of third surfaces 13 may be formed on one surface of the core material 10, or one or a plurality of third surfaces 13 may be formed on both surfaces of the core material 10.

As described above, the core material according to the present invention can disperse the stress due to atmospheric pressure during vacuum packaging on the third surface, and prevents deformation due to the stress acting intensively in the thickness direction. It can be suitably used as a core material that can be used.

1 Vacuum heat insulating material 10 Core material 11 First surface 12 Second surface 13 Third surface 20 Outer cover material

Claims (2)

One surface of the core material after vacuum packaging is such that the first surface, the second surface having a height different from that of the first surface, and the first surface and the second surface are inclined. With a third surface formed to tie ,
The first surface of the core material and the surface opposite to the second surface are formed of one plane.
A vacuum heat insulating material characterized in that the density of the core material on the first surface, the second surface and the third surface is uniform . The first surface, the second surface having a height different from that of the first surface, and the first surface and the second surface are connected to at least one surface of the core material in an inclined manner. With the formed third surface,
The first step of forming one plane on the first surface and the side opposite to the second surface,
The second step of covering the core material with the outer cover material and
The third process of evacuation and vacuum packaging,
A method for manufacturing a vacuum heat insulating material.

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