JPH0796580A - Vacuum heat-insulating material - Google Patents

Abstract

PURPOSE:To reduce a volume shrinkage factor of a core maternal of a vacuum heat-insulating material and to hardly produce an unevenness on a flat surface of a container. CONSTITUTION:A vacuum heat-insulating material 6 consists of a container 8 the inside of which is reduced to a vacuum and a heat-insulating member 9 contained in the container. The heat-insulating member is formed by combining two or more materials selected out of a glass-wool, a heat-insulating sheet 14 press molded out of the glass-wool, fibrillated resin fiber 10, and inorganic fine powder 11, such as a silica.

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 as a heat insulating material for refrigerators and the like.

[0002]

2. Description of the Related Art Heretofore, a vacuum insulating material of this type has a filling body in which a powdery material such as pearlite powder is contained in an inner bag made of a breathable non-woven fabric in a bag-shaped container having a gas barrier film formed therein. The container is housed, and in this housed state, the inside of the container is evacuated and hermetically sealed, and the inside is kept in a vacuum state (for example, see JP-A-62-13979).

[0003]

However, in the above-mentioned conventional structure, the filling body formed by accommodating the powdery material in the inner bag of the non-woven fabric is put into the container having the gas barrier property and exhausted, Although it is made to be in a vacuum state, there is a problem that the container is affected by the shape of the powdery substance that is evacuated and wrinkles and irregularities occur in this container, and the contact state with the exterior material deteriorates. .

The present invention solves the above problems, and an object of the present invention is to provide a vacuum heat insulating material in which deformation of the container after evacuation is suppressed.

[0005]

The present invention comprises a container having a vacuum inside and a heat insulating member placed in the container, the heat insulating member being glass wool and a sheet formed by pressing the glass wool. It is formed by combining at least two materials selected from materials, resin fibers and inorganic fine powder.

[0006]

The present invention is constructed as described above,
The heat insulating member that is put into a container and evacuated is made of glass wool and a material selected from a sheet material formed by pressing this glass wool, resin fiber and inorganic fine powder, and heat insulation after being evacuated It suppresses the contraction of the member and reduces the deformation of the container.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of the essential parts of a refrigerator using a vacuum heat insulating material according to an embodiment of the present invention. FIG. 2 is a sectional view of a main part of the vacuum heat insulating material of the present invention. FIG. 3 is an enlarged view of an essential part showing a state in which powder particles are included in the fiber of the present invention.

Reference numeral 1 denotes a refrigerator, which has an outer box 2, a heat insulating material 3 arranged inside the outer box, an inner box 4 arranged inside the heat insulating material, and an opening of the inner box. It is composed of a heat insulating door 5 that can be opened and closed.

The heat insulating material 3 is composed of a vacuum heat insulating material 6 and a foamed polyurethane 7 in which the vacuum heat insulating material is embedded.

The vacuum heat insulating material 6 is composed of a container 8 which is divided into two parts with a barrier film such as gas and water, and a heat insulating member 9 which is housed in this container. This heat insulating member is a nonwoven fabric 12 having air permeability obtained by mixing finely powdered (ultrafine) resin fibers 10 such as acrylonitrile fibers with an inorganic fine powder 11 of particles having a particle size of 10 μm or less such as silica.
A core material 13 is put inside the core material 13 and sandwiched by heat insulating sheets 14 formed by pressing glass wool on both sides of the core material. The resin fiber 10 is mixed with 80% by weight of inorganic fine powder 11 such as silica.

The fine inorganic powder 11 is held and held in the branches of the fibrillated acrylonitrile fiber.

The fibrillated resin fiber 10 is a long fiber body having a fiber length of 1 to 5 mm and a fiber diameter of 2 μm or less.

In the thus constructed vacuum heat insulating material, if the vacuum heat insulating material 6 is, for example, a quadrangle, one container 8
A heat insulating sheet 14 is placed inside, and then a core material 13 formed by placing a fibrillated resin fiber 10 in which an inorganic fine powder 11 such as silica is held in a non-woven fabric 12 is placed on the core material. After placing the heat insulating sheet 14 and finally covering the other container 8, the three sides are heat-sealed. Then, vacuuming is performed in a vacuum tank (not shown) to make the degree of vacuum in the container 8 0.1 to 0.01 Torr, and the other one of the opened ones is heat-sealed and hermetically sealed, and vacuum insulation is performed. The material 6 is formed.

The vacuum heat insulating material 6 is attached in contact with the inner wall of the outer box 2, and the foamed polyurethane 7 is filled between the outer box and the inner box 4 to be embedded with the foamed polyurethane to form the heat insulating material 3. . This heat insulating material uses the vacuum heat insulating material 6 having a small thermal conductivity to reduce the thermal conductivity,
It is designed so that refrigerators and other parts can be made of thin wall insulation.

The inorganic fine powder 11 such as silica is held so as to be held in the branch portion of the fibrillated acrylonitrile resin fiber 10 so that the volumetric shrinkage of the core material 13 before and after evacuation is reduced. By suppressing it, the deformation of the container 8 can be reduced.

The heat insulating sheet 12 formed by press-molding glass wool is brought into contact with the inner wall of the container 8 to hold the core material 13 in a sandwich shape. Even if the container 8 contracts, it is possible to suppress wrinkles and unevenness of the container 8 itself.

In the present invention, a non-woven fabric 1 is prepared by wrapping an inorganic fine powder 11 such as silica in a fibrillated resin fiber 10.
Deformation of the container 8 after evacuating by forming the vacuum heat insulating material 6 by accommodating the core material 13 formed by being placed in 2 and the heat insulating sheets arranged on both sides of this core material in the container 8. Is to prevent.

In the above description, the long fiber bodies and particles in which the fine inorganic powder 11 such as silica is wrapped in the fibrillated resin fiber 10 are put into the nonwoven fabric 12 to form the core material 13. As described above, the glass wool may be mixed with an inorganic fine powder such as silica, and when the mixing ratio of the inorganic fine powder to the fibrous body is increased, the glass wool is formed into a sheet by pressing. The heat insulating sheet is unnecessary.

[0020]

As described above, according to the present invention, a container having a vacuum inside and a heat insulating member placed in the container are formed, and the heat insulating member is formed by pressing glass wool and the glass wool. Since it is formed by combining at least two materials selected from the sheet material, the resin fiber, and the inorganic fine powder, the volumetric shrinkage of the heat insulating member after evacuation can be reduced, and the unevenness of the flat surface of the container can be reduced. Can be suppressed. In addition, the inorganic fine powder is made to be able to suppress the dust of particles at the time of production by being included in the fiber.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a refrigerator using a vacuum heat insulating material according to an embodiment of the present invention.

FIG. 2 is a sectional view of an essential part of the vacuum heat insulating material of the present invention.

FIG. 3 is an enlarged view of an essential part showing a state where powder particles are included in the fiber of the present invention.

[Explanation of symbols]

 6 Vacuum heat insulating material 8 Container 9 Heat insulating member 10 Resin fiber 11 Inorganic fine powder 14 Heat insulating sheet

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B32B 27/20 Z 8413-4F F25D 23/06 V (72) Inventor Kenji Tsukamoto Osaka Prefecture Moriguchi Keihan 2-18, Hondori Sanyo Electric Co., Ltd.

Claims (3)

[Claims] 1. A vacuum heat insulating material comprising a container having a vacuum inside and a heat insulating member placed in the container, wherein the heat insulating member is glass wool and a sheet material formed by pressing the glass wool. A vacuum heat insulating material formed by combining at least two materials selected from resin fiber and inorganic fine powder. 2. The vacuum heat insulating material according to claim 1, wherein the resin fibers are fibrillated fibers. 3. Inorganic fine powder is silica, calcium carbonate,
The vacuum heat insulating material according to claim 1, wherein the vacuum heat insulating material is formed of particles of 10 μm or less such as pearlite.