JPS59138875A - Heat-insulating material pack - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat insulating material pack used for heat insulating walls of heat insulating boxes of refrigerators, freezers, showcases and the like.

The structure of the conventional example and its problems Figures 1 to 3 show the conventional insulation pack metal.
The configuration of this conventional example will be explained below with reference to FIGS. 1 to 3.

In the figure, reference numeral 1 is a vacuum heat insulating material pack, a breathable inner bag 2 is filled with a filler 3, the inner bag 2 is covered with a container 4 made of laminate film, and the inside is covered with a 0.000.
The pressure was reduced to 0.01 Torr and the filling material 3
As the powder, powders such as closed cell powder 3a such as expanded perlite and crushed powder 3b such as expanded perlite were used. In the case of closed-cell powder 3a as this powder, as shown in FIG. However, in such cases, a closed-cell powder 3a such as expanded perlite was used as the filler 3 and vacuum-packed to obtain the insulation material puncture 1. In this case, the insulation pack 1 will be compressed due to the pressure difference between the inside and outside. However, the hollow part 6
The gas 6 contained in the powder cannot be sufficiently degassed during vacuum degassing, and after vacuum packaging, the closed cell powder 3a is ruptured by compression due to the difference in atmospheric pressure, and all the broken cell powder is produced, and the gas 5 is removed from the insulation material. It fills the bank 1 and reduces the degree of vacuum of the insulation pack 1 over time to about 0.0101 cal / mh °C.
0mata had the disadvantage that the thermal conductivity only decreased,
When the filler 3 is a crushed powder 3b such as expanded pearlite, there is no closed cell structure, so the degree of vacuum does not deteriorate due to bubble breakage (a low thermal conductivity of about 0,00651 cal/mh°C is obtained, but the insulation material ) The density of Kutsuku 1 is 0.2~0
．． It is heavy in weight at 3p/cc, and has drawbacks such as workability and structural reinforcement when used as a heat insulating material.

OBJECTS OF THE INVENTION The present invention eliminates all the drawbacks of the above-mentioned conventional examples, and aims to provide a heat insulating material hole that is lightweight and has excellent heat insulation properties. .

Structure of the Invention In order to achieve the above-mentioned object, the present invention vacuum-packs a powder having closed cells, then breaks the bubbles to produce a broken-cell powder having a spherical shape, and vacuum-packages the powder again. It has both the light weight of closed cell powder and the good heat insulation performance of pulverized powder.

DESCRIPTION OF THE EMBODIMENTS Below, the configuration of an embodiment of the present invention will be explained with reference to FIG. 1 is a heat insulating material pack, which consists of a filling 9 made of spherical-shaped foamed pearlite broken powder 8, a breathable inner bag 2 containing the filling, and a sealed plastic laminate film wrapped around the outer periphery of the filling 9. It is formed by a container 4 that is

In manufacturing the heat insulating material bag, first, closed cell powder such as foamed perlite is filled into a sachet 2 and sealed, and one end is opened and placed in a container 4 to fill the inside f I X 1.
One end of the container 4 is heat-sealed while maintaining the degree of vacuum at about 0-2 Torr. and.

The container 4 is vacuum-sealed under atmospheric pressure and left undisturbed, and the container 4 is compressed due to the pressure difference from the atmospheric pressure, thereby straining the closed cell powder 3a such as expanded perlite.

As a result, the pressure difference between the pressure of the gas 5 in the closed-cell powder 3a and the reduced pressure of the insulation pack 7 causes the closed-cell powder to
A is a foam-broken powder 3a having locally fractured surfaces 8 as shown in FIG.
' 0 Note that the foamed pearlite powder 8 that has been broken at this time is not flaky or acicular like when it is mechanically crushed, but has a shape that is close to a spherical shape 9 as shown in Figure 6. is maintained. Next, one end of the container 4 is opened, vacuum deaerated to 1×10 −21° orr again, and one end of the container 4 is heat-sealed to obtain a vacuum insulation pack 7 .

In the heat insulation pack 7 manufactured in this way,
The foam-breaking powder of expanded pearlite 3 a / which is the filler is:
It is not a closed cell and maintains a shape close to the spherical shape 9. Therefore, even after vacuum packaging, there is no gas and the initial degree of vacuum is maintained, resulting in 0,00607/m
Shows a small thermal conductivity of h℃ and 0.12-0.22
A lightweight density varying in p/cc can be obtained. In addition, compared to using crushed powder 3b such as foamed perlite, the particle size is larger, so there is no need to use a fine inner bag 2, improving air permeability, shortening the vacuuming time, and improving the manufacturing process. Effects of the Invention The present invention has the above-described structure, and the following effects can be obtained. Since the foam-broken powder is produced by breaking the foam while maintaining the cell density, and this foam-broken powder is packaged under reduced pressure, it is possible to obtain a weight reduction that is close to the density of the vacuum insulation pack obtained using closed-cell powder. At the same time, the poor thermal conductivity caused by the diffusion of the remaining four gases in the hollow portion of the closed cell, which was a drawback in this case, is improved.

(b) Since the particle size of the foam-broken powder is larger than that of the pulverized powder, the manufacturing process can be streamlined by allowing the use of open-mesh bags, improving air permeability, and shortening the vacuum degassing time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional heat insulating material pack, FIG. 2 is a perspective view showing one embodiment v1j of the filler shown in FIG. 1, and FIG. 3 is a perspective view showing another embodiment of the filler shown in FIG. 4 is a sectional view showing an embodiment of the present invention, and FIG. 5 is a perspective view of the filler shown in FIG. 4. 4... Container, 8... Breaking powder, 1o.
...Fracture surface, 11 ... Spherical 0

Claims (1)

[Claims] A powder with closed cells, such as expanded perlite, is packaged under reduced pressure to produce a spherical and broken foam powder, and this broken powder is covered with a container made of a laminate film such as metal foil and plastic, and the internal pressure is completely reduced. Insulation pack.