Stock material or miscellaneous articles – Sheet including cover or casing – Noninterengaged fibered material encased
Patent
1996-10-11
1998-07-07
Zirker, Daniel
Stock material or miscellaneous articles
Sheet including cover or casing
Noninterengaged fibered material encased
428 75, 156256, 156259, 156260, 156264, B32B 3112
Patent
active
057765804
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an insulating plate element that includes a heat-insulating core layer open to diffusion and a vapor-proof outer layer coated on both sides thereof.
Insulating elements of the above-mentioned type, wherein the heat-insulating core layer is formed of mineral wool, are used i.a., for insulating, cooling and freezing chambers, i.e., chambers having a temperature below the dew point of the ambient air. This means that if leakage occurs in an external vapor-proof outer layer, water vapor will diffuse into the insulating layer, and condensed water will be formed on the inner side of the inner vapor-proof layer and, depending on the temperature of the inner vapor-proof layer, an ice layer can be formed. The formation of ice, which cannot readily be observed since it takes place within the insulating element, will gradually increase and may in time lead to destruction of the insulating layers. Simultaneously, a progressive reduction of the insulating capacity of the defective insulating element will occur.
DE Patent No. 826,500 describes a chamber insulating element of the type described above wherein the core layer is formed of layers of separate bodies, and wherein vapor-proof films are provided between the layers. In case a leakage occurs in the external vapor-proof layer of such element, the resulting damage may be limited to the outermost layer of separate bodies, but the insulating capacity of the insulating element will be reduced over its entire outside. In addition, the known chamber insulating elements are difficult to produce on an industrial scale.
FR-A-938294 discloses an insulating sandwich element formed of a core layer of fibre glass lamellae separated by intervening layers of a thin flexible material, such as Kraft paper, and covered on one or both sides by outer plates of wood or a similar material so as to obtain a low weight element which is resistant to compression in a direction perpendicular to the outer plate(s).
It is the object of the invention to provide an insulating plate element of the type described above whereby the damage resulting from a leakage in any of the vapor-proof outer layers may be limited to affect only a small portion of the element and which element is also easy to produce on an industrial scale.
SUMMARY OF THE INVENTION
This object is obtained with the insulating element according to the invention wherein the core layer is divided into cells by means of vapor-proof separating layers which extend perpendicular to the vapor-proof outer layers and are connected thereto in a vapor-proof manner.
Owing to this division of the insulating plate element into vapor-proof cells, leakages, if any, will allow penetration of moisture into only a very limited portion of the element, and any formation of condensate and/or ice will result in only a slight reduction of the overall insulating capacity of the insulating element. Moreover, the separating layers contribute to increasing the bending strength and stiffness of the insulating element.
DK Patent Publication No. 137,579 discloses reinforced insulating elements which include strips of a soft insulating material, e.g., mineral wool, and wherein reinforcing layers which serve to impart to the insulating elements improved strength properties are provided between the strips. These reinforcing layers are made of a curable binder or adhesive in a fluid state, but the publication does not indicate that the reinforcing layers are to be vapor-proof. The known insulating element may be provided with external rigid layers or sheets but the publication does not indicate that these layers or sheets are vapor-proof or that they are connected to the reinforcing layers.
DD Patent No. 297,114 A5 describes a plate element for the adsorption of electromagnetic waves, in particular radar waves. The known elements are formed of a carrier sheet of, e.g., reinforced aluminium film onto which parallel strips of mineral wool, such as glass wool, are adhered, the strips being separated by an
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patent: 5073426 (1991-12-01), Blaauw
patent: 5230763 (1993-07-01), Roth et al.
N.o slashed.rgaard Luis
Rasmussen Jeppe
Rockwool International A/S
Zirker Daniel
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