INSULATING PLATE

Abstract: The invention relates to an insulation board (1), which is made of organic wood fiber pulp. According to the invention, the insulation board comprises a number of overlapping insulation board layers (2), which are made of some organic wood fiber pulp, such as heat fiberized wood fiber pulp or the like. The fiber length in the organic wood fiber pulp is within the range 1.0-5.0 mm, most advantageously 2.5-4.0 mm.

Description: Insulating plate The invention relates to an insulation board defined in the introductory part of the independent patent claim. In the prior art there is known, from the Finnish patent application 33,675, a slab- shaped insulant compiled of alternating corrugated and plain paper lamellas. The problem with this type of insulation is how it can be compactly fitted in a wall, in between vertical spars. Another problem is brought about by the air channels left in between the plain and corrugated paper lamellas, through which channels air can flow and thus eliminate the heat insulation capacities. The object of the invention is to introduce a novel insulation board manufactured of some organic pulp, particularly wood fiber pulp, which insulation board has good heat, fire and sound insulation capacities. The insulation board according to the invention is characterized by the novel features enlisted in the characterizing part of patent claim 1. It is an advantage of the invention that the insulation board therof is moisture resistant and respiring and has good heat insulation capacities. This type of insulation board is particularly suited to be used as heat insulation in wooden buildings; as was mentioned above, the board is made of wood fiber. Another advantage of the invention is that the insulation board is formed of several porous wood fiber material layers, which are advantageously joined without using any adhesives proper. If an adhesive is used, it is advantageously an ordinary, commercially available wood adhesive. Yet another advantage of the invention is that the wood fiber material layers together form a uniform insulation board without any open air apertures therebetween. Yet another advantage of the invention is that the insulation board is porous, flexible and easy to handle. It can be installed in place quickly and compactly as a cut-to-size insulation board for instance in between the vertical spars of a wall. The invention is described in more detail below, with reference to the appended drawings, wherein Figure 1 is a perspective illustration of an insulation board according to the invention; Figure 2 illustrates the cross-section A - A of the insulation board of Figure 1 ; Figure 3 illustrates another possible cross-section A - A of the insulation board of Figure 1; Figure 4 illustrates a t ird possible cross-section A - A of the insulation board of Figure 1; Figure 5 illustrates a fourth possible (partial) cross-section A - A of the insulation board of Figure 1; and Figure 6 illustrates the section B - B of the insulation board of Figure 5. The insulation board 1 comprises a number of overlapping insulation board layers 2. The insulation board layers 2 are made of some porous organic pulp, to which there is possibly added fire retarding agents, anti-rot agents and other similar agents generally used in organic insulants. The said material is advantageously heat fiberized pulp made of pine wood, so-called high-bulk pulp, where the fiber length is in the range 1.0 - 5.0 mm, most advantageously 2.5 - 4.0 mm. The thickness e of the insulation board layer 2 is for instance 2 - 15 mm. In an insulation board layer 2, the fibers are evenly distributed and directed at random to different directions. The insulation board 1 is compiled of for example 10 - 50 insulation board layers 2, in which case the thickness k of the insulation board is for example 25 - 150 mm. The width 1 and length p of the insulation board 1 are of the order 1 = 500 - 900 mm, and respectively p = 1,000 - 1.500 mm, but other measures are possible, too. The heat insulation capacity of the insulation board 1 is advantageously of the order 0,025 - 0,035 W/mK°. The bulk density of the insulation board 1 is of the order 25 kg/rn " . The border areas 3 of the insulation board 1 are formed of a uniform insulating layer 4; 5; 6, located on a perpendicular plane to the insulation board layers 2, and this insulating layer is made of the same organic pulp. The insulation board 1 is advantageously manufactured as follows. Into wood fiber pulp, such as the said high bulk pulp, there are mixed possible fire retarding agents, such as borax, plus possible anti-rot and anti-mildew agents etc, already at the production stage. The insulation board layers 2 are compressed of wood fiber pulp into porous lamellas with a thickness within the range of a few millimeters, as was maintained above. Thereafter the insulation board 1 is compiled by arranging a number of insulation board layers 2 on top of each other and by compressing the lamellas together and cutting them simultaneously to a predetermined width and length. In between the insulation board layers, there can be provided occasional adhesion spots 7, for instance at spaced points, where some adhesive, advantageously wood adhesive, is applied in order to ensure the gripping of the layers (figures 5 and 6). The border areas 3 of the insulation board 1 are treated with a water spray or a water-glue spray (this being an aqueous glue mixture made of water and a suitable poisonless glue, such as wood adhesive), which decomposes the wood fiber pulp so that the lignin contained therein is at least partly released. In a way it can be said that the border areas 3 melt owing to the effect of the water. When drying, the wet wood fiber pulp forms a uniform fiber pulp layer, which at the same time binds the insulation board layers 2 together. In the border areas 3, around the insulation board 1, there is now formed a uniform border insulation layer 4 (Figure 2), transversal to the plane of the insulation board 1 and the insulation board layers 2. As an alternative, at the edges of the overlapping insulation board layers 2 there are glued, most advantageously with a suitable water-based poisonless adhesive, at right angles with respect to the insulation board layers, an insulation board strip 5, 6, to serve as the border insulation layer, by means of which strip the insulation board layers 2 are primarily interconnected as a uniform insulation board (Figures 3 and 4). In width, the insulation board strip 5 corresponds to the thickness of the insulation board 2 (Figure 3), or the insulation board strip 6 is wider than the thickness k of the insulation board 1 (Figure 4). In the latter case, the edges 6a, 6b of the insulation board strip are turned over and attached, for instance glued, to the top and bottom surfaces of the insulation board 1.

Claims: Patent claims 1. An insulation board (1), made of organic wood fiber pulp, characterized in that the board comprises a number of overlapping insulation board layers (2), made of organic wood fiber pulp, advantageously heat fiberized pulp or the like. 2. The insulation board according to claim 1, characterized in that the fiber length in the organic wood fiber pulp is in the range 1.0 - 5.0 mm, most advantageously 2.5 - 4.0 mm. 3. The insulation board according to claim 1, characterized in that at least two opposing edges (3a, 3b) of the insulation board (1) are formed of a uniform border insulation layer (4; 5, 6), which is directed at right angles to the insulation board layers (2). 4. The insulation board according to claim 3, characterized in that the border insulation layers (4; 5, 6) are of the same material as the insulation board layers (2). 5. The insulation board according to claims 3 or 4, characterized in that the border insulation layers (4) are formed of the border areas of the insulation board layers (2) by melting them into a uniform, homogeneous pulp. 6. The insulation board according to claim 3 or 4, characterized in that the border insulation layers (5; 6) are formed of insulation boai'd strips (Figures 3 and 4). 7. The insulation board according to claim 6, characterized in that the border insulation layers (6) are formed of insulation board strips with their edges (6a, 6b) turned over and attached, advantageoush' by adhesion, to the top and bottom surfaces of the insulation board (1). 8. The insulation board according to any of the preceding claims, characterized in that the overlapping insulation board layers (2) are interconnected by at least occasional adhesion, advantageously with wood adhesive. 9. The insulation board according to claim 8, characterized in that in between insulation board layers (2), there are arranged spaced adhesion spots (7). 10. The insulation board according to any of the preceding claims, characterized in that in the wood fiber pulp of the insulation board layers (2), there are mixed fire retarding agents, such as borax, and/or anti-rot agents and/or anti -mildew agents.

Inventors: HUUSKO ASKO, HUUSKO, ASKO
Applicants: HUUSKO ASKO, KUITUMYYNTI VAAJAKOSKI OY, HUUSKO, ASKO
Application year: 1995
Main classification: E04B1
IPC codes: B32B21, E04B1, E04B2, E04C2