SI9400230A - Heating isolative material - Google Patents

Abstract

The thermo-insulation material "ksenoterm" (xenotherm) is a cheap, multi-purpose, high-performance, material intended primarily for the construction of well-insulated buildings where the height of conventional insulation materials might be an obstacle regarding price, aesthetics or technical solutions. This material is made of plastic sheets with deep drawn cells filled with an insulating gas. The exterior surface is additionally protected against diffusion. Before installing the material, tiles may be cut to obtain the appropriate shape. The estimated thermo-conduction is 0.007 W/mK, with xenon as the insulating gas and at room temperature.

Description

(57) Xenotherm thermal insulation material is a multifunctional, high-performance, low-cost material intended primarily for the construction of well-insulated structures where the thickness of conventional insulating materials would present a cost, aesthetic or technical barrier. The material is made of plastic films with deeply drawn cells filled with insulating gas. The outer surface is further protected from diffusion. Panels of material can be cut into any shape before installation. The estimated thermal conductivity is 0.007 W / mK, using xenon and at room temperature.

Sl 9400230 A

t

KING ALES

Okiškog 25

61110 LJUBLJANA

Thermal insulation material

The object of the invention is a highly efficient thermal insulation material based on deeply drawn pores filled with gas.

A technical problem solved by the invention is good insulation of consumer goods and equipment having spatial limitations.

Conventional commercial insulation materials are based on foamed materials whose pores are filled with either air or any other gas released during the expansion process. These gases typically have high thermal conductivity (0.020 to 0.030 W / mK for room temperatures). The pore walls, which represent 1 to 5 percent of the surface through which heat passes, have a thermal conductivity of 0.1 to 1.0 W / mK. Thus, the total thermal conductivity of such materials is 0.030 to 0.050 W / mK. Another approach to solving the problem is vacuum insulation. Two solutions are known here: a high vacuum Dewar tank with a thermal conductivity comparable to 0.0001 W / mK and a double wall container filled with noble gas at low absolute pressure (0.01 Bar). The comparable thermal conductivity of the last solution is from 0.005 to 0.009 W / mK. The disadvantage of Dewar's container is that it is expensive and limited to smaller vessels and tanks. The low-pressure noble gas solution has only recently been able to apply to household refrigerators, where it has managed to reduce the volume pertaining to thermal insulation by about six times. Similar to the Dewar principle, commercial generic insulation elements cannot be manufactured here because they are bonded to vacuum flat metal containers containing gas. Classic foamed or fibrous (mineral wool) materials take up too much space for modern requirements for quality insulation.

According to the invention, the problem is solved by a multilayer film of an amorphous layer having drawn pores up to 8 mm in diameter. Upon completion of the process, a multilayer bubble material is obtained. Production takes place in an atmosphere of insulating gas, e.g. xenon which provides us with high insulating ability. In the case of xenon filling, a thermal conductivity of 0.007 W / mK is obtained. The resulting multi-layer slice of the insulating material must be protected against leakage of the insulating gas and the intrusion of ambient air or other gases into the interior due to the micro porosity of the elastomeric materials. This problem is solved with thin aluminum (or other) low-permeability foil glued to the slice from the outside. The required thickness of the aluminum foil is 0.02 mm. However, the aluminum foil must be protected from the outside from mechanical damage, for example. when making plaster on a building. The described solution is identical in its use to the classic foamed materials, which can be cut into suitable pieces and shapes at the place of use and placed in the desired place. The only difference is that within 24 hours the cut points on the insulation slice need to be re-protected with aluminum or other foil, which can be e.g. prepared in the form of adhesive tape. An embodiment of the invention is shown by means of sketches.

Sketch (1) shows the spatial appearance of three plastic films with deeply drawn cylindrical cells. The cylindrical cells are 6 to 12 mm in diameter with a depth of 5 mm. The wall thickness of the cell is estimated to be 0.01 to 0.03 mm. In (1), we also see a way to stack individual foils into layers. Properly folded films form a homogeneous structure of cells separated from each other, which are indicated for a single layer in (2) by (a), (b) and (c). Compound (d) is tight so as to prevent the free flow of insulating gas. Thus, one layer of insulating material is formed by two inverted and compressed films with deeply drawn cells. The layers are then further folded into a slice of the desired thickness. The slice of the insulation material is then coated on both sides with protective film as shown in the drawing (3). In the drawing (3), (e) the slice is made up of layers of insulating material, the mark (f) indicates the final layer of plastic film that completes the rear surface, and the mark (g) indicates the anti-diffusion protective layer, which is intended made of 0.02 mm thick aluminum foil and finally a mark (h) indicating a layer that protects the layer (g) from mechanical damage. The choice of material for the protective layer (h) depends on the purpose of the insulation. For elements where layer (g) is already protected by the construction of the element (eg, the walls of a household refrigerator), layer (h) is unnecessary. Slices of insulating material are made into square panels with an edge of, for example, 1.5 m. The side edges of the slice must be further protected by the protective layers (g) and (h). All the procedures described so far are performed in the atmosphere of the gas that we want to have in the cellular structure and, if necessary, at elevated temperature. A temperature rise is required if the material described is manufactured for use at higher temperatures. Currently, the best known filling gas is xenon. It has the lowest thermal conductivity at high chemical stability and non-toxicity. The protective layer (g) for protecting the side edges must be of a material with a thermal conductivity below 20 W / mK in order not to cause a thermal bridge. Slices of such insulating material can be cut into any shape. The only limitation is the need to protect the severed surface against the diffuse degeneration of the interior. The protection is presumably carried out with a self-adhesive foil that meets the requirements for foils (g) and (h). It is foreseen that there will be 24 hours between the cutting and the re-sealing of the cut edge. The thermal insulation panels can then be attached to structures with molded and glued joints.

Aleš KRALJ

Claims (1)

Multipurpose thermal insulation material with a cell structure filled with gas, characterized in that it has a cell structure made by a mechanical plastic transformation process and that the cells are filled with a specially selected gas. Ales KRALJ / J Sketch Aleš KRALJ Excerpt Thermal insulation material is a multifunctional, high-performance, low-cost material designed primarily for the construction of well-insulated structures where the thickness of conventional insulation materials would represent a cost, aesthetic or technical barrier. The material is made of plastic films with deeply drawn cells filled with insulating gas. The outer surface is further protected from diffusion. The panels of material can be cut into any shape before installation. The estimated thermal conductivity is 0.007 W / mK, using xenon and at room temperature.