Stock material or miscellaneous articles – Composite – Of carbohydrate
Patent
1996-12-19
1998-05-19
Zirker, Daniel
Stock material or miscellaneous articles
Composite
Of carbohydrate
156292, 156297, 442 23, 428 68, 4284111, B32B 312, E04H 112
Patent
active
057533784
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a structural material, particularly for use in building simple housing. More specifically, the invention relates to a structural material comprising at least one load-bearing layer manufactured from cellulose-composite material and a protective layer comprising a metal foil connected thereto on at least one side.
2. Description of the Prior Art
The laminated structural material disclosed in EP-A-0 122 905 is comprised of a cellulose based load-bearing panel, for instance, a chipboard panel or a flax fiber panel, which is coated with a moisture-proof layer, for instance, an aluminum foil or luminized paper layer. This moisture proof layer is adhered to the load-bearing panel by means of a polyvinylalcohol adhesive. Also, a decorative outer layer, for instance a PVC layer, may be connected to the panel. The structural material is intended to be used for paneling walls or ceilings.
Various other documents describe structural materials made of cellulose-composite layers covered with a protective layer. Examples of such publications are EP A-0 068 873 and FR-A-2 292 812, which both disclose structural materials based on a cardboard core, DE-A-29 35 093, DE-A-22 16 387 and FR-A-2 225 282, which all describe structural materials with a wood based core, and FR-A-2 259 801, which describes a sandwich panel having a core of fire-proof cellulose waste material DE-U-81 31 739 describes a composite skirting-board having a wooden core and aluminum and PNVC outer layers
In order to provide living accommodations in developing regions and to provide assistance to refugees, migrants and victims of natural disasters, as well as for reconstruction after calamities and acts of war, there is usually a demand for construction, in a rapid and effective manner, of houses which fulfill the requirements of shelter, stability and insulation. It is important here to be able to have available a structural material which has sufficient rigidity and strength for building applications, which can withstand varying climatological conditions and which can be produced and transported in large quantities quickly and at low cost.
SUMMARY OF THE INVENTION
The invention provides for this purpose a structural material of the type described above, which is characterized in that the covering layer is a laminate comprising at least one plastic foil having a grid structure arranged on the metal foil. Cellulose-composite material combines a relatively great rigidity and strength with a low weight and is moreover comparatively inexpensive. Providing this material with a protective covering layer ensures that the good structural properties of the cellulose-composite material are preserved irrespective of the climatological conditions under which the material is used. The metal foil, for instance, an aluminum foil, is moisture-impermeable and cannot be penetrated by vermin and also has a favorable ratio of strength to weight. The grid structure of the plastic foil furthermore serves to protect the underlying metal from damage. A preferred material for this purpose is a polyamide gauzes
For optimum protection the load-bearing layer of cellulose-composite material is preferably provided on both sides or even on all sides with a covering layer.
The laminate may comprise a plurality of foils of different types of plastic, one of which can serve, for instance, as a finishing layer, for simple decoration.
The load-bearing layer and the protective layer are preferably connected by a polyethylene adhesive layer. Similarly, polyethylene adhesive layers may be used between the various foils of the laminate.
The structural material preferably has a plurality of load-bearing layers, at least one of which is manufactured partially of wood. The structural material can hereby be fixed with simple screwed or nailed connections to, for instance, a frame.
The invention also has for its object to provide a method for producing comparatively large quantities of structural material rapidly and
REFERENCES:
patent: 3110643 (1963-11-01), Downing
patent: 3427216 (1969-02-01), Quinn
patent: 4865912 (1989-09-01), Mitsumata
patent: 5264062 (1993-11-01), Ohsumi et al.
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