Static structures (e.g. – buildings) – Irreversibly reactive component
Reexamination Certificate
1999-10-25
2001-05-15
Cuomo, Peter M. (Department: 3636)
Static structures (e.g., buildings)
Irreversibly reactive component
C052S612000
Reexamination Certificate
active
06230458
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention pertains to a refractory composite slab comprising three layers that consist essentially of inorganic expanded materials of various grain sizes, such as expanded vermiculite, which are glued with bonding agents and subsequently compressed, where at least two layers of such expanded materials are provided, between which a flat reenforcement layer is located, as well as its use.
2. Description of Related Art
Three-layer slab composites of the above-mentioned type have been known to the art previously, for instance, from CH-A-590 798. These, however, are not fire-resistant because they contain a core layer of magnesite-cemented wood wool.
A process for the production of non-combustible fire-resistant slab composites that are composed of three layers comprised of expanded materials, such as vermiculite and perlite, has already been known to the art from EP-A1-43144. In this slab composite, each material forms a slab layer of its own. In order to manufacture the individual slab layers, a granulate composed of the above-mentioned inorganic expanded materials is mixed with a binder material, which may be based, for instance, on thermosetting resins in a combination with phosphates. Having been treated in this manner, the granulate is then compressed into slabs.
Due to the exclusive use of inorganic materials, the finished fire-resistant slab composites have a high weight, as well as relatively high stiffness values. Consequently, their further processing, for instance in the context of the usual molding processes, ranges from difficult to impossible.
Therefore, in accordance with DE-A-26 00 024, the amount of inorganic expanded materials was reduced by providing layers made of fibrous media that were bonded with a binder. It is true that, as a result, the weight of the slab is reduced; however, international fire protection standards can no longer be met.
SUMMARY OF THE INVENTION
Therefore, it is the object of the present invention to provide a fire-resistant slab composite that can be processed further within the context of the usual molding processes, making it possible to achieve the desired mechanical sound insulating and water-resistant characteristics at a relatively low weight while at the same time meeting international fire protection regulations.
Therefore, in accordance with the invention, a three-layer fire-resistant slab composite of the kind mentioned at the outset is provided, which is characterized by the fact that the core layer is a slab comprised of glued expanded materials of various grain sizes combined with inorganic fiber-containing fillers, and which, on both sides of this core layer, outer layers are provided in the form of slabs comprised of at least two layers of glued expanded materials, between which there is present a continuous flat reinforcement layer which is highly resistant to mechanical stress.
Moreover, the three-layer fire-resistant slab composite in accordance with the invention has the advantage that the reinforcing layer is a mechanically deformable metal layer, woven fabric, knitted fabric, or fibrous web of organic and/or inorganic fibers.
In addition, metal foils can be provided on both sides of the core layer in an advantageous manner. In accordance with the invention, the three-layer fire-resistant slab composite is used for construction purposes in the interior of buildings and ships.
The invention will now be explained in greater detail by means of FIGS.
1
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3
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Marolt Iva
Silc Milan
Bacon & Thomas
Cuomo Peter M.
Mineralka D.O.O.
White Rodney B.
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