JPS613738A - Vacuum heat-insulating material - 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 [Technical Field] The present invention relates to a vacuum heat insulating material in which a spacer material is vacuum sealed in an outer bag made of a laminate film.

[Prior Art] Currently, vacuum insulation materials used in refrigerators are often embedded in foamed polyurethane due to strength issues. In this case, there was a problem in that the fluorocarbon gas present in the foamed polyurethane penetrated the outer bag made of a laminate film and entered the inside, degrading the degree of vacuum and making it impossible to exhibit its heat insulation properties over a long period of time.

For this reason, in the past, as shown in Figure 2, in order to adsorb the invading fluorocarbon gas with an adsorbent such as activated carbon and prevent the degree of vacuum from decreasing, activated carbon powder l was sealed in a breathable inner bag 2. It was vacuum-sealed with an outer bag 4 together with a spacer material 3.

In this case, a breathable inner bag 2 is required to seal the activated carbon 1, and since the activated carbon 1 is gathered in one place, the fluorocarbon gas that has permeated in a place away from the activated carbon 1 can be absorbed into the spacer material 3. The probability that it will pass through the inside and be adsorbed by activated carbon 1 is low, and as a result, the adsorption efficiency of activated carbon 1 will be poor.
There was a drawback that a large amount of activated carbon 1 was required to maintain the degree of vacuum.◇ [Purpose] The present invention is capable of maintaining the degree of vacuum for a long period of time with a small amount of activated carbon, and the activated carbon can be used in an inner bag. The purpose of this invention is to provide a vacuum insulation material that is easy to manufacture and does not require encapsulation.

[Example] Reference numeral 11 is a heat insulating wall of a refrigerator or the like, and a foamed heat insulating material 14 such as hard urethane foam is filled and foamed between an outer wall 12 and an inner wall 13, and a vacuum heat insulating material is provided in the foamed heat insulating material 14. 15
is buried.

The vacuum insulation material 15 includes a spacer material 16 such as an inorganic powder such as perlite or calcium silicate, a fiber such as glass wool, or an organic foam such as foamed polyurethane, and an exterior made of a laminate film made of plastic, metal foil, metal-deposited film, etc. The bag 17 is vacuum-sealed, and the inner surface of the exterior body 17 has an adsorbent such as activated carbon impregnated in a breathable sheet such as paper or nonwoven fabric to adsorb the fluorocarbon gas that has passed through the exterior body 17. C) 18, 18
are placed facing each other.

Therefore, since the adsorbent such as activated carbon impregnated in the adsorption sheet 18.18 is spread over a wide area, it can effectively adsorb the fluorocarbon gas that permeates from the outer bag 17. The amount used is small, and since there is no need for an inner bag for enclosing activated carbon as in the conventional method, manufacturing is easy and costs can be reduced.

〔effect〕

As described above, the present invention combines spacer materials such as inorganic powders such as perlite and calcium silicate, fibers such as glass wool, or organic foams such as foamed polyurethane into an exterior bag made of a laminate film made of plastic, metal foil, metal-deposited film, etc. In the vacuum insulation material that is vacuum-sealed inside, an adsorption sheet formed in a sheet shape so as to have air permeability is placed on the inner surface of the exterior body, so that the fluorocarbon gas that permeates into the vacuum insulation material It can effectively adsorb and maintain its insulation properties for a long time with a small amount of adsorbent used, and it has a very simple structure and can be manufactured at low cost, so it has many remarkable effects such as greatly reducing costs. It's something you get.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a heat insulating wall equipped with the vacuum heat insulating material of the present invention;
FIG. 2 shows a longitudinal sectional view of an insulating wall provided with a conventional vacuum insulation material. 15: Vacuum insulation material, 16: Spacer material, 17: Exterior bag, 18, 18: Adsorption sheet. Agent: Patent attorney Aihiko Fuku (2 others) Figure 81 Figure 1J2

Claims (1)

[Claims] 1. Spacer materials such as inorganic powders such as perlite and calcium silicate, fibers such as glass wool, or organic foams such as foamed polyurethane are vacuum sealed in an exterior bag made of a laminate film made of plastic, metal foil, metal-deposited film, etc. A vacuum heat insulating material characterized in that an adsorption sheet formed in a sheet shape so as to have air permeability is disposed on the inner surface side of the exterior body.