JPH09136367A - Vacuum heat-insulation material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To elevate heat-insulation efficiency more than that of pulp and rockwool and to make the vacuum heat-insulation material more inexpensive than glass wool by using a mixture of a glass wool with another fibrous material such as a pulp and a rockwool as an insulation member. SOLUTION: A vacuum heat-insulation material 6 is formed of a film with a barrier properties to gas, water, etc., and is constituted of a container 8 divided into two and an insulation material 9 stored in this container. As the vacuum heat-insulation material 6, when it is e.g. square, an insulation member 9 prepd. by mixing a glass wool with a fibrous material such as a pulp or rockwool is arranged in one container 8 and then, after another container 8 is covered, three sides are heat-sealed. Then, the inside of the container 8 is made vacuum by performing vacuum suction in a vacuum tank and the opened remaining one side is heat-sealed to seal it hermetically and a vacuum heat- insulation material 6 is formed thereby. By mixing the pulp or the rockwool with the glass wool, the insulation efficiency does not decrease remarkably in comparison with the case of the glass wool alone.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a vacuum heat insulating material used in a refrigerator or the like.

[0002]

2. Description of the Related Art Conventionally, in a vacuum heat insulating material using glass wool, glass wool is stored in a container divided into two parts with a film having a barrier property against gas, moisture, etc. It is constructed such that it is evacuated and hermetically sealed, and the inside is kept in a vacuum state (for example, see Japanese Patent Laid-Open No. 7-96563).

[0003]

However, in the above-mentioned structure, only glass wool is stored in the container as a heat insulating member in order to maintain the heat insulating efficiency. As a problem at the present time, using only glass wool as a heat insulating member is high in cost and has not been put into practical use at present.

Focusing on the above-mentioned drawbacks of the prior art, the present invention mixes glass wool with an inexpensive fibrous material such as pulp or rock wool and uses it as a heat insulating member to obtain a lower cost vacuum heat insulating material. The purpose is to provide.

[0005]

In a vacuum heat insulating material composed of a container having a vacuum inside and a heat insulating member placed in the container, glass wool is mixed with other fibrous material such as pulp or rock wool. The heat-insulating member is used.

[0006]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a refrigerator, which has an outer box 2 and a heat insulating material 3 arranged inside the outer box.
It is composed of an inner box 4 arranged inside the heat insulating material, and a heat insulating door 5 for opening and closing the opening of the inner box.

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

In FIG. 2, the vacuum heat insulating material 6 is formed of a film having a barrier property against gas, moisture and the like, and comprises a container 8 divided into two and a heat insulating member 9 housed in this container. It is configured. When the vacuum heat insulating material 6 is, for example, a quadrangular shape, a heat insulating member 9 in which glass wool is mixed with fibrous material such as pulp or rock wool in one container 8
And then cover the other container 8 and heat seal the three sides. Then, the inside of the container 8 is evacuated by evacuation in a vacuum tank (not shown), and the remaining one of the opened ones is heat-sealed and sealed to form the vacuum heat insulating material 6.

The pulp and rock wool used for the heat insulating member are fibrous like glass wool, but when used alone as a heat insulating member for a vacuum heat insulating material, in comparison of heat insulating efficiency, it is comparable to silica / open cell urethane. Or it falls below that. The thermal conductivity of the pulp alone is 0.0100 kcal / mhr ° C, and that of rock wool is 0.0060 kcal / mhr ° C. However, the cost is 1/10 or less as compared with glass wool. Therefore, it is possible to significantly reduce the cost by using glass wool and pulp or rock wool in a mixture. As shown in Figure 3, 50% glass wool
+ Others (pulp, rockwool, etc.) at a mixing ratio of 50%, the thermal conductivity is 0.0030 kcal / mhr ° C or less, and in terms of heat insulation efficiency, the heat insulation efficiency is not so high compared to a heat insulation member made of 100% glass wool. Is not seen.
On the other hand, in terms of cost, it is possible to reduce the cost by 40% as compared with a heat insulating member made of 100% glass wool.

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 2 and the inner box 4 to be embedded with the foamed polyurethane to form the heat insulating material 3. There is. By reducing the thermal conductivity of this heat insulating material, a refrigerator or the like can be formed of a thin heat insulating material.

[0012]

As described above, according to the present invention, in a vacuum heat insulating material composed of a container having a vacuum inside and a heat insulating member placed in the container, other than glass wool such as pulp or rock wool. By using a mixture of the fibrous material as the heat insulating member, the cost is lower than that of the heat insulating member composed only of glass wool, and the heat insulating efficiency is higher than that using only pulp or rock wool. Can make high vacuum insulation.

[0013]

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of the vacuum heat insulating material of the present invention.

FIG. 3 is a diagram showing a heat insulating efficiency and a mixing ratio of glass wool and pulp or rock wool in the heat insulating member of the present invention.

[Explanation of symbols]

 6 Vacuum insulation 8 Container 9 Thermal insulation

Claims (1)

[Claims] 1. A vacuum heat insulating material comprising a container having a vacuum inside and a heat insulating member placed in the container, wherein glass wool is mixed with other fibrous material such as pulp or rock wool. A vacuum heat insulating material, which is used as the heat insulating member.