JPH0771867A - Heat insulator unit and heat insulative box using the same - Google Patents

Abstract

PURPOSE:To eliminate an existence of unfilled part by a method wherein a vacuum heat insulative materail is mounted on an urethane foaming metal die, and hard urethane foam is filled and foamed without being influenced of 'fin' which injure fluidity by inserting a heat insulator unit which is foamed and molded into a rectangular board. CONSTITUTION:A container is formed, by heat sealing at three sides of laminate film which sandwiches an aluminium foil 3, between a PET film 1 having high gas barrier property and a PE 2 which is prominent in the heat sealingness. Fine powdery silica 4 is filled in this container and the inside of the container is vacuum exhausted, and the, an opening is heat sealed to form a vacuum heat insulative material 5. On the other hand, a rectangualr board-shaped foaming metal die 7 is formed which has a depth and a thickness of a box of an electric refrigerator as its length and thickness, and also a prescribed width. After the vacuum heat insulative materail 5 which is made a little smaller than the metal die 7 and has a 'fin' 6, a heat sealing margin, formed all over the periphery is inserted along a bottom surface of the metal die 7, hard urethane foam is poured in as a foaming agent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulation unit,
More specifically, it relates to a heat insulating material unit made of urethane foam which contains a vacuum heat insulating pack filled with powdered silica or the like.

[0002]

2. Description of the Related Art Rigid urethane foams using various alternative foam materials have been used in place of the rigid urethane foams using freon, which is harmful to the environment and used in the cabinets and doors of electric refrigerators. However, each has problems in terms of heat insulation performance and cost. As a heat insulating material with good heat insulating performance, a new heat insulating material made of foamed rigid urethane foam containing a vacuum heat insulating material has been used. The structure of the conventional vacuum heat insulating material is shown in FIG. Aluminum foil 3
Then, fine powder silica 4 etc. is filled as an aggregate in a laminated film container composed of a PET film 1 having a high barrier property and a PE film 2 having an excellent heat sealing property, and after the interior is evacuated, the opening is heat sealed. The vacuum heat insulating material 5 is formed. For example, the heat insulating material of the electric refrigerator is such that the vacuum heat insulating material 5 is provided in a housing 12 in which an outer box 10 and an inner box 11 are combined.
Is inserted to fill and foam the rigid urethane foam 8. However, when forming a laminated film container, the vacuum heat insulating material 5 has two laminated films that are heat-sealed on three sides, and after vacuum evacuation, the openings are heat-sealed.
Has a "fin" 6 which serves as a seal margin all around. When the vacuum heat insulating material 5 is placed in the housing 12 of the electric refrigerator and the rigid urethane foam 8 is also filled and foamed, the “fins” 6 of the vacuum heat insulating material 5 impede the fluidity of the hard urethane foam 8. However, there is a problem that an unfilled portion is generated.

[0003]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention includes a vacuum heat insulating material having a "fin" portion, fills and foams a rigid urethane foam in advance to form a rectangular parallelepiped board. An object of the present invention is to provide a heat-insulating box body in which the heat-insulating material unit is inserted into a space of a box body formed by combining the formed heat-insulating material unit and an outer box and an inner box.

[0004]

According to the present invention, a container formed by laminating an aluminum foil between a PET film having a high gas barrier property and a PE having an excellent heat-sealing property is filled with powdered silica. After evacuation of the inside, the vacuum heat insulating material whose opening was heat-sealed was attached to a urethane foam mold of a predetermined size, filled with hard urethane foam, and foamed and molded into a rectangular parallelepiped board shape. And Then, in the space between the outer box and the inner box that form the box body, in a container formed by laminating an aluminum foil between a PET film having a high gas barrier property and PE excellent in heat sealability, and laminating it. After filling the powder silica and evacuating the inside, vacuum heat insulation with the opening heat-sealed into a urethane foam mold of a specified size, filled with hard urethane foam, and foamed into a rectangular parallelepiped board. It is characterized in that a molded heat insulating material unit is inserted.

[0005]

In the urethane foam mold for inserting the vacuum heat insulating material according to the present invention, the vacuum heat insulating material is placed in the mold and then urethane is injected and the lid is closed. Since it can be injected over a wide range, it can be filled and foamed without the influence of "fins" that impede fluidity, and can form a rectangular solid urethane foam insulation unit with no unfilled parts. It can be inserted into the combined box body to form a heat-insulating box body having no unfilled portion.

[0006]

EXAMPLE An example of the present invention will be described. As shown in FIG. 1, fine powder is placed in a container formed by heat-sealing three sides of a laminate film in which an aluminum foil 3 is sandwiched between a PET film 1 having a high gas barrier property and a PE 2 having an excellent heat-sealing property. After the silica 4 is filled and the inside is evacuated, the opening is heat-sealed to form the vacuum heat insulating material 5. The foam mold 7 is formed in the shape of a rectangular parallelepiped board having the depth and thickness of the housing 12 of the electric refrigerator as the length and the thickness, and the width of the housing 12 as the predetermined dimension. Along the bottom surface of the mold 7, a "fin" for heat sealing around the entire circumference formed to be slightly smaller 6
After inserting the vacuum heat insulating material 5 having the above, a hard urethane foam (water foaming) which does not use CFC as a foaming agent is injected, the lid is closed and foamed to form a board-shaped heat insulating material unit 9. As shown in FIG. 2, the heat insulation unit 9 formed by the board-shaped rigid urethane foam 8 is inserted into the housing 12 of the electric refrigerator configured by combining the outer box 10 and the inner box 11 to insulate the electric refrigerator. Used as a material.

[0007]

EFFECT OF THE INVENTION In the urethane foam mold for inserting the vacuum heat insulating material according to the present invention, since urethane can be injected in a wide range, it can be filled and foamed without the influence of "fins" which impedes the fluidity, and a rectangular solid having no unfilled portion. A urethane foam insulation unit can be formed. Therefore, it can be used as a heat insulating material of a rigid urethane foam that is not affected by "fins" in the housing of an electric refrigerator.

[Brief description of drawings]

FIG. 1A is a cross-sectional view of a heat insulating material unit containing a vacuum heat insulating material in a urethane foam mold, and FIG. 1B is a perspective view showing a hard urethane foam heat insulating material unit containing a vacuum heat insulating material. .

FIG. 2 is a perspective cross-sectional view of a main part in which a heat insulating material unit of hard urethane foam including a vacuum heat insulating material is inserted into a housing of an electric refrigerator.

3A is a cross-sectional view and FIG. 3B is a perspective view of a vacuum heat insulating material.

[Explanation of symbols]

 1 PET (Polyethlen terephthalate) film 2 PE (Polyethlen) sheet 3 Aluminum foil 4 Filler 5 Vacuum insulation 6 Urethane foam mold 7 Rigid urethane foam 8 Insulation unit 9 Outer box 10 Inner box 11 Electric refrigerator housing

Claims (2)

[Claims] 1. A PET (Polyethlen te) having a high gas barrier property.
rephthalate) film and PE (P
(Olyethlen) A laminated aluminum foil sandwiched with a film is filled with powdered silica, the inside is evacuated, and the inside is heat-sealed. A heat insulating material unit characterized by being mounted on a mold, filled with hard urethane foam, and foamed into a rectangular parallelepiped board shape. 2. A gap between an outer box and an inner box forming the box body,
A container formed by sandwiching an aluminum foil between a PET film (same as above) having a high gas barrier property and a PE (same as above) film having excellent heat-sealing properties, filled with powdered silica, and evacuated the interior, Attach the vacuum heat insulating material with the opening heat-sealed to a urethane foam mold of a predetermined size,
A heat-insulating box body, characterized in that a heat-insulating material unit filled with hard urethane foam and foamed and molded into a rectangular parallelepiped board is inserted.