JP2947541B2 - Vacuum insulation pack - 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 pack which can be used as a heat insulating material for refrigerators and the like.

[0002]

2. Description of the Related Art A conventional vacuum heat insulating material pack has 10 internal parts.
^-2 Inorganic foamed powder such as pearlite with a vacuum of less than Torr was coated with a plastic-metal foil laminating film container. On the contrary, if the thickness of the metal foil is sufficiently increased, the surface heat conduction increases by increasing the thickness of the metal foil, so that the thermal conductivity of the vacuum heat insulating material pack in the initial state increases, and the heat insulating performance is deteriorated. .

[0003] For example, in the case of coating with an aluminum foil having a thickness of 30 µm and in the case of not covering it, an initial value of 0.0
080Kcal / mh ° C and 0.0060Kcal / mh
There was a significant difference in ° C. Therefore, a container having an excellent initial value and a small change over time has been required. As means for solving such problems, there is one described in Japanese Utility Model Laid-Open No. 58-111498.

The contents described in Japanese Utility Model Laid-Open Publication No. 58-111498 will be described with reference to FIGS. In FIG. 1, reference numeral 1 denotes a vacuum heat insulating material pack comprising an inorganic foamed powder 2 such as perlite, and a container 3 made of a laminated film of plastic-metal foil. The film has an outer layer 4
A plastic film such as polypropylene having a thickness of 20 μm, a metal foil made of aluminum foil having a thickness of 30 μm for the middle layer 5, and a plastic film such as polyethylene having a thickness of 50 μm for the inner layer 6. The inorganic foamed powder 2 is filled between two laminate films to seal the outer periphery.
I have.

Here, the middle layer covers the surface of the seal portion 7 up to a distance of 5 mm from the inner end 8 of the adhesive. By using the laminate film having such a structure, the vacuum heat insulating material pack 1 having a low thermal conductivity and excellent initial characteristics can be obtained because the seal portion 7 has no metal foil. Since the portion is minute with respect to the entire surface area, the vacuum heat-insulating material pack 1 with little change over time, which is equivalent to the case where it is completely covered with metal foil, is characterized.

[0006]

However, in manufacturing the above-mentioned conventional laminate film, if the size of the container is 50 × 50 × 4 tcm, the outer plastic film is cut into a size of 53 × 53 cm. Cut the middle layer metal foil to a size of 51.5 x 51.5 cm,
Furthermore, the plastic film of the inner layer must be cut into a size of 53 × 53 cm, and each must be attached.

[0007] In such a method, since it is cut into a predetermined size in advance, continuous production is difficult, and there has been a problem that it cannot be manufactured industrially at low cost.

Further, if the mounting position of the metal foil in the middle layer is shifted, the upper and lower metal foils come into contact with each other in the heat seal portion, and there is a problem that the heat insulating performance is reduced and stable performance cannot be obtained. Was.

Further, in the conventional vacuum heat insulating material pack, when the heat insulating material is attached to the wall surface of the heat insulating box, the heat seal portion on the periphery is separated from the wall surface, so that the heat insulating material is filled when the foam heat insulating material is filled.
A cavity is formed in the space between the seal portion and the wall surface, resulting in a poor appearance due to shrinkage, resulting in a problem that product quality is significantly impaired.

[0010] The present invention solves the above-mentioned conventional problems, and can provide a vacuum heat insulating material pack which can be manufactured industrially at low cost, has stable performance, and has excellent product quality. It is an object to provide a heat-insulated box body.

[0011]

In order to solve the above-mentioned conventional problems, a vacuum heat insulating material pack of the present invention is provided with a through-hole in a molded material obtained by molding a plastic laminated film,
An upper lid member formed by peripherally welding a barrier material made of a plastic-metal foil laminated film to a part of the molding material so as to cover the through-hole; and a plastic-metal foil laminated film.
And a core material having a continuous opening structure.

Further, according to the method for manufacturing a vacuum heat insulating material pack of the present invention, a through hole is provided in a molded material obtained by molding a plastic laminate film, and the plastic material is covered by covering the through hole.
A barrier material made of a metal foil laminated film is peripherally welded to a part of the molding material to form an upper lid material, and a core material having a continuous opening structure is filled in the upper lid material, and then the pressure is reduced in a vacuum container. The pressure is reduced, the peripheral edge of the molding material is welded to a lower lid material made of a plastic-metal foil laminating film at a predetermined pressure, and the product is hermetically sealed.

The heat-insulating box body of the present invention has the lower lid side of the vacuum heat-insulating material pack attached to the wall surface of the heat-insulating box body as an adhesive surface, and a foam heat-insulating material is provided in a space formed by the outer box and the inner box. Is filled.

[0014]

With the above construction, a barrier material made of a plastic-metal foil laminate film is partially adhered to a molding material, so that excellent heat insulation performance with little heat conduction by the metal foil is obtained. Since it is provided only on the material, the upper and lower metal foils do not come into contact with each other due to the displacement of the bonding position of the barrier material, and stable performance can be obtained.

In addition, since the barrier material is attached to the formed material by peripheral welding, the attachment is easy, continuous production is possible, and industrially inexpensive production is possible.

Further, a through-hole is provided in a molded material obtained by molding a plastic laminated film, and a barrier material made of a plastic-metal foil laminated film is peripherally welded to a part of the molded material so as to cover the through-hole. Although the upper lid material is formed, when there is no through hole, if the pressure is reduced in a vacuum vessel, the residual air between the barrier material and the molding material expands, breaking the welding peripheral portion and eliminating the effect of providing the barrier material. In some cases, the provision of the through-hole can solve this problem and contribute to stable quality.

Further, since the molding material is made by vacuum forming, when the vacuum heat insulating pack is mounted on the wall surface of the heat insulating box, it is necessary to form the heat sealing portion on the peripheral edge into close contact with the wall surface. As a result, it is possible to obtain a heat-insulating box with stable product quality, which does not cause shrinkage due to the formation of cavities when the foam heat-insulating material is filled.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3 and 4. FIG. In FIG. 1, reference numeral 9 denotes a vacuum heat insulating material pack, a core material 10 such as open-celled rigid urethane foam, a molded material 12 obtained by vacuum forming a plastic laminate film 11, and a barrier material for a plastic-metal foil laminated film 13. 14 and a lower cover member 16 of a plastic-metal foil laminated film 13.

The structure of the film 11 is as follows.
Plastic film with excellent chemical resistance and gas barrier resistance such as denatured acrylic nitrile with a thickness of 20 μm for the middle layer
It is made of plastic film with excellent gas barrier property such as polyvinylidene chloride with thickness of 30mm, and plastic film with excellent chemical and gas barrier property such as modified acrylonitrile with 30μ thickness in the inner layer. -Film.

The structure of the film 13 is as follows.
Plastic film with excellent chemical and gas barrier properties such as modified acrylic nitrile with a thickness of 9 mm, metal foil made of 9 μm thick aluminum foil in the middle layer, and chemical resistance with a 30 μm thick modified acrylic nitrile in the inner layer. It is made of a plastic film having excellent gas barrier properties, and is bonded to each other to form a laminate film.

The molding material 12 is obtained by molding the laminate film 11 into a concave shape using a vacuum molding machine.

Reference numeral 17 denotes a through hole provided in the center of the molding material 12. A barrier material 14 having a desired size is attached to the flat portion 18 of the molding material 12 so as to cover the through hole 17. At the time of sticking, the peripheral portion 19 of the barrier material 14 is heat-welded to the molding material 12 by heat sealing.
An interlayer space 20 between the second member 2 and the barrier material 14 is opened to the outside through a through hole 17.

The core material 10 is attached to the upper lid material 15 thus formed.
, And the lower lid member 16 is arranged so as to overlap the peripheral edge of the upper lid member 15, and first, two opposing sides of the peripheral edge are heat-sealed. Then, the vacuum heat insulating material pack 9 is obtained by placing it in a decompression container 21, depressurizing the inside, heat-sealing the remaining two opposing sides and sealing the two sides.

With the above configuration, the barrier material 14 having the metal foil is partially adhered, so that the heat conduction by the metal foil is small and excellent heat insulating performance is obtained. Is provided only on the flat portion 18 of the above, so that the upper and lower metal foils do not come into contact with each other due to the displacement of the bonding position of the barrier material 14, and stable performance can be obtained.

Further, according to the above-mentioned method, the barrier material 14 having a metal foil is formed by heat sealing the molding material 12.
Therefore, it is easy to install, it is possible to perform continuous production, and it is possible to manufacture it industrially at low cost.

Since a through hole 17 is provided in the molding material 12 and the barrier material 14 is adhered thereto, the interlayer space 20 between the molding material 12 and the barrier material 14 is connected to the outside through the through hole 17. As a result, when the space is depressurized in the pressure vessel 21, the pressure in the interlayer space 20 is also reduced, so that the residual air in the interlayer space 20 generated when there is no through hole expands and breaks the welding peripheral portion 19, and the barrier 19 is formed. It contributes to the stability of quality without the phenomenon of breaking the material 14. In FIG. 4, reference numeral 22 denotes a heat insulating box, a space formed by the inner box 23, the outer box 24, the vacuum heat insulating material pack 9 attached to the inner surface of the outer box 24 without any gap, the inner box 23 and the outer box 24. Made of the foamed heat insulating material 25.

Since the vacuum heat insulating material pack 9 is attached to the inner surface of the outer case 24 without any gap by the above-described structure, the space formed by the inner case 23 and the outer case 24 is filled with the foam heat insulating material 25. In this case, there is no void formation and a stable heat-insulating box without shrinkage can be obtained.

[0028]

As described above, according to the present invention, a through-hole is provided in a molded material obtained by molding a plastic laminated film, and a barrier material made of a plastic-metal foil laminated film is formed so as to cover the through-hole. Since it is a vacuum heat insulating material pack composed of an upper lid material partially welded to the periphery, a lower lid material made of a plastic-metal foil laminated film, and a core material having a continuous opening structure, heat conduction by metal foil Excellent heat insulation performance is obtained, and the barrier material is provided only on the molding material, so that the upper and lower metal foils do not come into contact due to the displacement of the bonding position of the barrier material,
Stable performance can be obtained.

Further, since the molding material and the peripheral portion of the barrier material are attached by welding, the attachment is easy, continuous production is possible, and industrially inexpensive production is possible.

Further, since a through hole is provided in the molding material and the barrier material is attached, the interlayer space between the molding material and the barrier material is connected to the outside world through the through hole. As a result, when the pressure is reduced by installing in the decompression container, the interlayer space is also depressurized, so that it is possible to prevent the welding peripheral portion from being broken due to the residual air expansion of the interlayer space which occurs when there is no through hole, and the barrier material In addition, since the molding material is made by molding, when the vacuum insulation pack is attached to the wall surface of the heat insulation box, the peripheral heat seal part is attached to the wall surface. Since it is possible to form a shape that is in close contact with each other, it is possible to obtain a heat-insulating box body with stable product quality, which does not cause shrinkage due to the formation of a cavity when the foam heat-insulating material is filled.

[Brief description of the 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 an enlarged sectional view of a molding material of a vacuum heat insulating material pack according to one embodiment of the present invention.

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

FIG. 4 is a cross-sectional view of the heat insulating box in one 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 FIG. 5;

[Explanation of symbols]

 Reference Signs List 9 vacuum heat insulating material pack 10 core material 11 plastic laminated film 12 molding material 13 plastic-metal foil laminated film 14 barrier material 15 upper lid material 16 lower lid material 17 through hole 21 depressurized container 22 heat insulating box 23 inner box 24 outer box 25 foaming Insulation

Claims (4)

(57) [Claims] 1. A through-hole is formed in a molded material obtained by molding a plastic laminated film, and a barrier material made of a plastic-metal foil laminated film is formed by peripherally welding a part of the molded material so as to cover the through-hole. A vacuum heat insulating material pack comprising: an upper lid material, a lower lid material made of a plastic-metal foil laminated film, and a core material having a continuous opening structure. 2. A through-hole is provided in a molded material obtained by molding a plastic laminated film, and a barrier material made of a plastic-metal foil laminated film is peripherally welded to a part of the molded material so as to cover the through-hole. After forming a material, the inside of the top lid material is filled with a core material having a continuous opening structure, and then the pressure is reduced in a decompression container. At a predetermined pressure, the periphery of the molding material and a plastic-metal foil laminated film are formed. A method for producing a vacuum heat insulating material pack which is welded to a lower lid material and hermetically sealed. 3. A heat insulating box body in which a foam heat insulating material is filled in a space formed by combining an outer box and an inner box, wherein a through-hole is provided in a molded material obtained by molding a plastic laminate film. An upper lid material formed by peripherally welding a barrier material composed of a plastic-metal foil laminated film to a part of the molding material, a lower lid material composed of a plastic-metal foil laminated film, and a continuous opening structure. A heat insulation box, wherein a vacuum heat insulation material pack comprising a core material is provided on a wall surface of the heat insulation box. 4. A space formed by combining an outer box and an inner box.
In a heat-insulating box with a foam
Through-holes in the molded material of the stick laminated film
And a plastic-metal foil laminate covering the through-hole.
A barrier material made of a net film is used as a part of the molding material.
Forming the upper lid material by peripheral welding, continuous inside the upper lid material
Fill core material with open structure, then reduce in vacuum container
Pressing, at a predetermined pressure, the periphery of the molding material and the plastic-
Welding with metal foil laminating film lower lid material
Cut off the lower lid material side of the sealed vacuum insulation pack as the adhesive surface.
An insulated box that is bonded and fixed to the wall of the heat box.