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Vacuum insulation and thermal barriers

A technology of vacuum heat insulation and vacuum space, applied in the direction of protecting pipes, heat exchange equipment, pipes/pipe joints/fittings through heat insulation, etc., it can solve the problem that the rise of thermal conductivity cannot be suppressed, and the vacuum state of vacuum heat insulation parts cannot be maintained for a long time. , gas barrier film shrinkage rate and other problems, to achieve the effect of inhibiting evaporation cracks, long-term maintenance of thermal insulation performance

Active Publication Date: 2021-12-14
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the difference in shrinkage rate when the gas barrier film shrinks after the vacuum heat insulating material has passed through the heating and drying process is large, vapor deposition cracks will occur.
In this case, the vacuum state inside the vacuum insulation material cannot be maintained for a long period of time, and the increase in thermal conductivity cannot be suppressed.

Method used

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  • Vacuum insulation and thermal barriers
  • Vacuum insulation and thermal barriers
  • Vacuum insulation and thermal barriers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0022]

[0023] figure 1 It is a sectional view which shows the schematic structure of the vacuum heat insulating material 1 which concerns on Embodiment 1 of this invention. Additionally, when including figure 1 In the drawings included below, the dimensional relationship or shape of each component may be different from the actual ones. Specific dimensions and the like of each component should be determined after referring to the following description.

[0024] Such as figure 1 As shown, the vacuum heat insulating material 1 is a heat insulating material that achieves low thermal conductivity by vacuuming the inside. The vacuum heat insulating material 1 has an approximately rectangular flat plate shape as a whole. The vacuum heat insulating material 1 is equipped with the core material 2, the adsorbent 3, and the cover material 4.

[0025] The core material 2 maintains a vacuum space. The adsorbent 3 adsorbs at least moisture. The outer wrapper 4 covers the core mat...

Embodiment 1

[0050] In Example 1, aluminum vapor-deposited ethylene-vinyl alcohol (EVOH), silica vapor-deposited stretched nylon (ONY ). In addition, the relationship between the water vapor permeability of the outer cover 4 caused by the difference in shrinkage between silica vapor-deposited stretched nylon (ONY) and aluminum vapor-deposited ethylene-vinyl alcohol (EVOH), and the relationship as a vacuum heat insulating material 1 The relationship between the amount of thermal conductivity increase was investigated.

[0051] As the surface protection layer 41 of the cover material 4, stretched nylon (ONY) having a film thickness of 25 μm was used. As the gas barrier layer 42 , silica vapor-deposited stretched nylon (ONY) with a film thickness of 12 μm and aluminum vapor-deposited ethylene-vinyl alcohol (EVOH) with a film thickness of 12 μm laminated together with the inorganic vapor-deposited surface facing each other were used. Non-stretched polypropylene (CPP) with a film thickness of...

Embodiment 2

[0065] In Example 2, aluminum vapor-deposited ethylene-vinyl alcohol (EVOH), silica vapor-deposited polyethylene terephthalate, and two sheets of gas barrier films constituting the gas barrier layer 42 of the exterior material 4 of the vacuum heat insulating material 1 were used. Ethylene glycol formate (PET). In addition, Example 2 was compared with the sample of Example 1 in terms of water vapor permeability of the exterior material 4 and the amount of increase in thermal conductivity as the vacuum heat insulating material 1 .

[0066] As the surface protection layer 41 of the cover material 4, stretched nylon (ONY) having a film thickness of 25 μm was used. As the gas barrier layer 42 , silicon dioxide vapor-deposited polyethylene terephthalate (PET) with a film thickness of 12 μm and aluminum vapor-deposited ethylene-vinyl alcohol with a film thickness of 12 μm were used to bond the inorganic vapor-deposited surfaces facing each other. (EVOH). As the heat-welded layer 43...

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Abstract

The vacuum insulator is provided with: a core material, which maintains a vacuum space; an adsorbent, which absorbs moisture; The outer package is configured to include: a surface protection layer, a gas barrier layer comprising at least two gas barrier films, and a thermal welding layer, and at least two gas barrier films are heated at 100° C. The difference between the shrinkage ratios of the gas barrier films is within 2%.

Description

technical field [0001] The present invention relates to a vacuum heat insulating member and a heat insulating box having a gas barrier layer on an outer wrapping member. Background technique [0002] Conventionally, as a vacuum heat insulator used as a heat insulator for a refrigerator or the like, it is known that a core material for maintaining a vacuum space is covered with an adsorbent for absorbing water vapor with two sheets of wrappers, and the inside of the wrapper is sealed under reduced pressure. vacuum insulation. [0003] The outer cover is configured to include a surface protection layer, a gas barrier layer, and a thermally welded layer. The heat conductivity of the vacuum heat insulating material is reduced by maintaining the inside as a vacuum by the outer covering. [0004] As a known technique, Patent Document 1 discloses a technique in which two inorganic vapor-deposited films constituting a gas barrier layer are stacked so that the inorganic vapor-depos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L59/065
CPCF16L59/065
Inventor 大森夕贵藤村一正向山贵祥
Owner MITSUBISHI ELECTRIC CORP