JPH06337093A - Vacuum insulation pack - Google Patents

Abstract

PURPOSE:To provide a high orientation rate and improve insulation performance by forming hard urethane foam of continuous bubble structure via a double conveyor, removing a skin from the foam and slicing the foam in the same direction as the travel of the double conveyor for use as a core material. CONSTITUTION:A vessel 3 is filled with a hard urethane foam core material 2 having continuous bubble structure, a barrier material 5 and an adsorbing agent 6. Then, the vessel 3 is sealed with a cover material 4, thereby forming a vacuum insulation pack 1. In this case, the hard urethane foam core material 2 is made by removing the skin layer 14 of hard urethane foam 13 of continuous bubble structure manufactured with a double conveyor and slicing a product 15 so obtained in the same direction A as the travel of the double conveyor. As a result of slicing the product 15 in the same direction, an orientation rate is improved, thereby enabling heat conduction to be lowered.

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 In recent years, in order to improve the heat insulating performance of a heat insulating box, attention has been paid to the use of a vacuum heat insulating material pack whose inside pressure is reduced. As the core material of this vacuum heat insulating material pack, powder such as pearlite, honeycomb, and foam are used.

For example, it has been proposed to use a hard urethane foam having an open cell structure as a core material, as disclosed in Japanese Patent Laid-Open No. 14725/1987.

The contents described in Japanese Patent Laid-Open No. 62-14725 will be described with reference to FIGS. 4, 5 and 6.

In the figure, reference numeral 16 is a hard urethane foam block which is foamed and cured in an open panel jig 17 using a urethane high-pressure foaming machine. Reference numeral 18 is a high-density skin layer having closed cells formed on the surface of the hard urethane foam block 16, and the skin layer 18 is removed from the hard urethane foam block 16 and cut into a predetermined size to complete a continuous state. The heat insulator 19 having a cell structure is obtained.

The heat insulating body 19 thus obtained is made of metal.
A vacuum heat insulating material pack which does not have a problem that the heat insulating performance is deteriorated due to a decrease in the degree of vacuum caused by gas diffusion from the closed cell portion by sealing the inside of the cover under reduced pressure with a container 20 made of a plastic laminate film. 21 is obtained.

[0007]

However, in the above-mentioned prior art, the skin layer having a large number of closed cells formed on the surface of the hard urethane foam block is removed in order to obtain a heat insulator having a completely open cell structure. Therefore, there is a problem that the product yield is deteriorated and it cannot be manufactured industrially at low cost.

In order to improve such deterioration of product yield, it was considered to increase the block size of the hard urethane foam block to reduce the proportion of the skin layer to be removed and improve the product yield.

However, in the case of jig foaming, when the block size is increased, the raw material is discharged for a long time, and there is a large time lag between the raw material in the early stage of discharge and the raw material in the latter stage of discharge. There is a problem in that the raw materials indicating the above form a block while being mixed, and as a result, the desired heat insulating performance cannot be obtained due to abnormal orientation of the cells, and when they are sealed under reduced pressure, they shrink.

If a double conveyor manufacturing method, which is generally used as a soft slab manufacturing method, is applied, the above problems such as jig foaming can be solved, and large-sized foam blocks can be continuously connected. However, the rigid urethane foam having an open-cell structure produced by the double conveyor moves in the traveling direction of the conveyor while rising, and is pressed by the upper conveyor, so that the cells are There was a problem that the desired heat insulation performance could not be obtained depending on the cutting direction because the orientation was three-dimensional.

[0011]

In order to solve the above conventional problems, the vacuum heat insulating material pack of the present invention comprises a core material made of a hard urethane foam having an open cell structure manufactured by a double conveyor, and In a vacuum heat insulating material pack consisting of a container consisting of covering a core material, the skin layer of the hard urethane foam having an open cell structure obtained by the double conveyor is removed, and cut in the same direction as the moving direction of the double conveyor. It is a vacuum heat insulating material pack having the obtained core as a core material.

[0012]

With the above structure, the hard urethane foam having the open-cell structure manufactured by the double conveyor moves in the traveling direction of the conveyor while rising, and is pressed by the conveyor on the upper side.
By using the core material cut in the same direction as the traveling direction of the conveyor, the foam having the highest cell orientation rate is used, and as a result, a vacuum heat insulating material pack having excellent heat insulating performance can be obtained. You can do it.

Due to the above effects, it becomes possible to continuously produce a large-sized rigid urethane foam having an open cell structure, the product yield is remarkably improved, and it is possible to industrially manufacture at low cost.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be explained. In the figure, reference numeral 1 denotes a vacuum heat insulating material pack, which is composed of a core material 2 having an open cell structure, a container 3, a lid material 4, a barrier material 5, and an adsorbent 6.

The container 3 is constructed such that the outer layer 7 is a polyvinyl chloride film having a thickness of 200 μ, and the middle layer 8 is 500.
* Polyvinylidene chloride film with a thickness of 25μ having an aluminum vapor deposition layer with a thickness of 10-10m, 50 in the inner layer 9
It is composed of a high density polyerylene film having a thickness of μ.

The lid member 4 and the barrier member 5 are composed of a polyethylene terephthalate film having a thickness of 16 μ in the outer layer 10, an aluminum foil having a thickness of 9 μ in the middle layer 11, and a thickness of 50 μ in the inner layer 12. It is composed of high-density polyethylene film.

Numeral 13 is a large block hard urethane foam having an open cell structure obtained by the double conveyor 14, and numeral 15 is a foam block of the above-mentioned foam block 13 from which the skin layer is removed.

Table 1 shows the results of measuring the thermal conductivity of each vacuum heat insulating panel in the case where the 13 foams were cut in three directions.

[0019]

[Table 1]

As is clear from (Table 1), the best heat insulation performance is obtained when the foam is cut in the A direction (the same direction as the conveyor travel direction).

It is considered that this is because the thermal conductivity due to the resin was reduced, since the attached orientation rate shows the highest value.

From the above, by cutting the foam in the same direction as the traveling direction of the conveyor, the core material is obtained.
A vacuum heat insulating material pack with excellent heat insulating performance can be obtained.

[0023]

As described above, the vacuum heat insulating material pack of the present invention comprises a core material made of a hard urethane foam having an open cell structure manufactured by a double conveyor, and a plastic laminate film covering the core material. In a vacuum heat insulating material pack consisting of a container, the skin layer of the hard urethane foam having the open-cell structure obtained by the double conveyor is removed, and obtained by cutting in the same direction as the moving direction of the double conveyor. Since it is used as the core material, the orientation of the cells is high and the vacuum heat insulating material pack having excellent heat insulating performance can be obtained.

[Brief description of 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 view of a main part of FIG.

FIG. 3 shows a hard urethane foam according to an embodiment of the present invention.
Perspective view of the mobile block

FIG. 4 is a sectional view of a conventional hard urethane foam block.

FIG. 5 is a perspective view of a conventional heat insulator.

FIG. 6 is a sectional view of a conventional vacuum heat insulating material pack.

[Explanation of symbols]

 1 Vacuum insulation material pack 2 Core material 3 Container

Claims (1)

[Claims] 1. A core material made of a hard urethane foam having an open cell structure produced by a double conveyor,
In a vacuum heat insulating material pack consisting of a container covering the core material, the skin layer of the hard urethane foam having an open cell structure obtained by the double conveyor is removed and cut in the same direction as the moving direction of the double conveyor. A vacuum heat insulating material pack having the obtained core as a core material.