JPS60256700A - Vacuum heat-insulating panel - 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 Other than technical aspects: This invention relates to a vacuum insulation panel with excellent heat insulation performance.

Vacuum insulation materials have recently begun to be used as insulation materials that have insulation performance that far exceeds conventional technology and plastic foam insulation materials.

This vacuum insulation material can be made of inorganic powder such as perlite powder, silicate calcium powder, organic powder such as plastic powder, inorganic porous molded material such as calcium silicate molded material, open-cell plastic foam, etc. It is made by covering a core material such as an organic porous molded body or fibrous material such as glass fiber or ceramic fiber with a coating material such as metal or plastic, evacuating the inside, and sealing it. a-hr 'C
Below the lowest value θ003Kcal 7m・effect・℃ is reached ν
It is an excellent heat insulating material with heat transfer liquid.

However, this Mag! The heat insulating performance of a heat insulating material depends on the degree of internal vacuum, so the heat insulating performance decreases as the vacuum level decreases.

If a metal material is used as the above-mentioned covering material, since the metal material hardly allows gas to pass through, it is possible to obtain a material that maintains the vacuum level well and does not deteriorate its heat insulation performance. However, since the metal sheathing material on one side parallel to the heat flow forms a heat soak, when used as a panel with a small size, heat conduction at the top of the side surface parallel to the heat flow direction due to the sheathing material increases. There is a disadvantage that the overall insulation properties are reduced.

On the other hand, if a plastic material is used as the covering material, a thermal bridge will not be formed because a metal material that conducts heat is not used, but plastic materials have much higher gas permeability than metals and are better at maintaining vacuum There is a problem that is worse than that.

Therefore, a metal film such as aluminum foil or aluminum vapor-deposited film is added to a plastic film with low gas permeability such as polyvinyl alcohol or polyvinylidene chloride. BACKGROUND ART Vacuum heat insulating materials such as heat insulating panels are made using a multi-layer laminated plastic-metal film laminate film (hereinafter abbreviated as laminate 1 film).

However, in a vacuum insulation panel using such a laminate film as a covering material, 1181 parallel to the heat flow direction
The metal film in the O2 laminate film in the surface area constitutes the amount of heat, and in order to obtain high heat insulation performance, the heat loss due to heat transfer from there cannot be ignored.

for example,! ;00X! Assuming a panel with f00X and 20 strings, and calculating the amount of heat that escapes from the forehead 1&:, the following result is obtained. Assuming that aluminum foil with a +i value of 20μ is used for the gold M4 film, the conductivity of aluminum is θ0Kca1/
Note that m&+Ihr・℃, Ql--200X 20
X / 0-' X O, 5X 'l X j 'r
xH10,0 knee 0. 'I Kcal/hr @'c, while the amount of heat transmitted through the panel itself changes the conductivity of the panel to θOO
If 7~θθ03Kca1/m11hr・℃, then Q mushroom-7~3×10-”XO,!;×0.3X#TxH
10,02;, j□ -g, 75~3.7! ; X/0-”KcaJ
/hr ・”c.

It is clear from this calculation that the amount of heat transmitted through the forehead is approximately 10 times more than the amount of heat transmitted through the panel itself.

This phenomenon tends to become more pronounced as the insulation panels become smaller.

Purpose of the Invention The present invention was made in view of the above circumstances, and it is an object of the present invention to provide a vacuum insulation panel that reduces heat loss from the side surface of the frame and has even better heat insulation performance.

Structure of the Invention The vacuum insulation panel of this invention is made of laminate film gold! The percent mark is that the four membranes are discontinuous on the side of the forehead from one surface to the other.

Detailed Structure FIG. 7 shows a first embodiment of the panel of the present invention, which is of a type in which no metal film is provided on the side surface of the frame portion of the panel, and reference numeral 1 in the figure indicates a vacuum insulation panel. This vacuum insulation panel 1- is made by filling a bag body 2 of a laminated film with a core material 3 and evacuating the inside under reduced pressure. A metal film 4 is present in the laminate film, but the metal film 4 is not present in a portion corresponding to f#i portion B parallel to the heat flow direction of the panel 1. In addition, this (2) combination, gold JII4
The membrane 4 may be on the outer surface, the inner surface or in the middle of the laminate film, and for this reason, in FIG. 7 the metal membrane 4 is represented by a solid line and the plastic film 5 is represented by a broken line.

The following methods can be used to improve this type of vacuum insulation panel 1.

First, as a first method, a metal film 4 is formed in advance on a portion that will become surface portion A of a plastic film 50 forming a laminate film, as shown in FIG. As the metal film 4, a metal foil having a thickness of 30 μm or more or a vapor deposited film having a thickness of /μ or more is used. The surface of the plastic film 5 on which the metal film 4 is provided may be either the inner or outer surface of the panel, or the middle of the multilayer film, and can be formed at any convenient position for manufacturing. When using metal foil as the metal film 4, various bonding methods such as a normal dry lamination method, wet lamination method, and fusion bonding method are employed. Another method is to form the metal film 4 on the entire surface of the plastic film 5 and then remove the portion that will become the forehead portion B by pickling treatment or the like. In this way, surface part A
Metal iIm only in the parts that become! The laminated film with 4 formed thereon is made into a bag shape so that the surface S becomes the surface A, and the core material 3 is filled inside the bag. A bag 2 is manufactured using only the film 5, filled with a core material 3, evacuated, and sealed to prepare a panel in advance. Then, there is a method in which only the surface sA of this panel is instantaneously immersed in molten metal such as molten aluminum to form the surface AK metal film 4.

1 FIG. 3 shows a second embodiment of the panel of the present invention, in which the metal film 4 is broken and discontinuous at the frame portion B of the panel 1. This type of panel 1
can be obtained, for example, by the following method.

First, a laminate film 6 having a metal film 4 provided on its entire surface is prepared. This film 6 is deep-drawn to form a tray-shaped container 7 as shown in FIG. During this deep drawing process, the elongation of the metal film 4 is smaller than the elongation of the plastic film 5, so the edge 7a of the container 7 where the elongation rate of the film 6 is large + the frame part B of the panel 1. As shown in FIG. S, the metal film 4 breaks in parallel to the bottom surface of the container 7 at the point where the metal film 4 breaks. This container 7
The desired panel 1 can be obtained by filling the container with the core material 3 and heat-sealing the peripheral portion 7b of the container 7 with a flat laminate film 6. Here, the thermal conductivity of the plastic film is 0. Yu Kcal/mh Su Al: 200 Kc
al /mh 'C and /θO0@ have openings* e
? 11. tld'2""I[?#-”F7)2jl'
A-(D-corresponds to 571,1°. ρ Specific action and effect not yet shown) In the vacuum insulation panel 1 of the first embodiment, since the metal film 4 is not present in the frame portion B, In the vacuum insulation panel 1 of the second embodiment, since the metal film 4 is broken at the forehead part B, a thermal bridge connecting one surface part A and the other surface part A by the metal film 4 is not formed. It is assumed that the amount of heat escaping through the covering part B is extremely small, and the amount of heat transferred to the panel 1 is very small.In addition, the IkJ part A, which has a much larger area than the forehead part B, has a metal film 4. Since gas permeation is small, the internal vacuum level can be maintained for a long period of time, and there is almost no deterioration in insulation performance over time.

In particular, in the panel 1 of the second embodiment, since the metal film 4 is also present in the wA section B, the metal film 4 is present on most of the total surface area of the panel 1, and the amount of gas permeation is improved. The amount of heat is further reduced, the high vacuum thigh is maintained for a long time, and since the fever in the forehead area B is broken, there is no heat transfer from the forehead area B, and the very high insulation performance of the panel 1 as a whole is maintained for a long time. .

For example, 5OOX left OO where the metal film 4 does not exist on the forehead B
Looking at the change over time in the degree of vacuum of the vacuum insulation panel of ×Om, the following results are obtained. Metal film of laminate film 4
The gas permeability of the part without (forehead part B) is set to 0. / cc
/ Φ place / ATM, laminate film * membrane 4
(Aluminum foil 30μ) The gas permeability of the mounting part (surface part A) is set to zero, and the degree of sealing vacuum during actual panel production is θ0.
/ Torr, the change in the degree of vacuum will be as shown in the graph shown in Figure S.

On the other hand, in the panel 1 where the metal film 4 is provided on both the top 1ftlB and the surface portion A, the gas permeability is zero, so the original degree of sealing vacuum is maintained.

By the way, in the case of the vacuum insulation panel 1 in which powder such as perlite is used as the core material 3, the change in heat amount depending on the degree of vacuum is approximately as shown in the graph shown in FIG. 6.

As is clear from this graph, the degree of vacuum is 2 to 3 Tarr.
It can be seen that the thermal conductivity suddenly increases after .

From Figure S, it is true 22 after 70 years of the panel where the gold W4 film 4 does not exist on the frame part B! Since the vacuum level of this panel is approximately 2 Torr, the insulation performance of this panel after 70 years will be slightly lower than it was when it was manufactured, and it is actually sufficient insulation performance. You can see that it holds. Therefore, even in this panel without the metal film 4 on the forehead part B, the initial heat insulation performance is maintained for at least IO years, and the heat loss due to heat transfer from the forehead part B is lower than that of the panel with the metal film 4 on the forehead part B. Since the amount is much smaller than that of , the overall insulation performance is extremely excellent.

In addition, the panel of the second embodiment has even better vacuum retention properties.
Therefore, it exhibits better insulation performance.

As described in detail of the invention, in the vacuum insulation panel of the present invention, the metal film of the ξnate film forming the bag is discontinuous at the @ part from one surface to the other. The forehead does not constitute a heat bath, and the amount of heat transferred from the forehead is significantly reduced. Further, there is little decrease in the degree of vacuum due to gas permeation from the forehead, and the deterioration in heat insulation performance over time due to the decrease in the degree of vacuum is practically no problem.

1. Therefore, this vacuum insulation panel has extremely excellent insulation performance as a whole.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view showing the first embodiment of the vacuum insulation panel of the present invention, Fig. 8.2 is a perspective view showing an example of the laminate film used in the panel of the 10th embodiment, and Fig. 3 The figure is a schematic sectional view showing the second embodiment, and FIG. 4 is a perspective view showing a molded container used in the panel of the second embodiment.
Figure S is a graph showing the change over time in the vacuum degree of a panel in which no metal film is present in the @ part, and Figure 6 is a graph showing the relationship between the vacuum insulation panel and the heat quantity rate. 1...Vacuum Wfr heat panel, 2...Bag body, 3...Core material, B...Forehead, 4...
...Friday) A smell, 6... Laminate film. Applicant: Nippon Sanso Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Ichizaki Ya, Yoaki, 101 Figure 6 1O-31σ210-'10'10'*'2/l
(Torr) ':1 (・

Claims (1)

[Claims] Non-molten and solid powder, solid and solid powder, non-M: [porous molded product,
In a vacuum insulation panel made by covering an organic porous molded body and a core material such as fiber with a plastic-metal membrane laminate film and vacuuming the inside, the five-metal metal membrane of the laminate film absorbs the heat of the panel. A vacuum insulation panel characterized by discontinuity from one side of the surface perpendicular to the flow direction of the panel to the other at the base part parallel to the heat flow direction of the panel.