SK1232007A3 - Joists and profiles with application of plastifying wood - Google Patents

Abstract

Joists and profiles of plastificated wood, consisting of tables, posts and fillings characterized in that the upper table (1) and the lower table (2) are interconnected by filling (3).

Description

Prisms and profiles with application of plasticized wood

Technical field

BACKGROUND OF THE INVENTION The present invention relates to glued beams for load-bearing elements of structural structures or insulating applications, for example, window profiles using plasticized wood usually plasticized on the basis of ammonia gas or its compounds.

BACKGROUND OF THE INVENTION

Prisms for load-bearing elements of static structures are usually made by gluing and dimensioned according to the load and permissible stress of the wood used. They are impregnated or surface treated with fungal parasites and moisture.

A disadvantage of such a prism, for example in bending stress, is that the mechanical properties of the material are the same throughout the cross-section and the dimensioning is made from the point of view of the permissible stress on the edge fibers of the prism.

Window profiles are usually made of glued europiles. In order to increase the service life, spots susceptible to fungal parasites are specially impregnated. The outer surface is treated with coatings. The disadvantage of coatings is the need for their renewal.

The heat transfer coefficient of the profile is determined by the properties of the wood used and can only be changed by the thickness of the profile.

The realization of large-scale production of plasticized wood opens up completely new possibilities also in the area of production of prisms and profiles.

In the process of plasticization and subsequent pressing, the properties of plasticized wood change, thereby changing its specific weight, mechanical properties, color, resistance to water absorption, dimensional stability, requirements for surface treatment, etc ..

From common hardwoods, products comparable to exotic wood species such as tik, mahogany, rosewood, ebony with significantly better mechanical properties are achieved by plasticization and subsequent pressing.

SUMMARY OF THE INVENTION

The above drawbacks of the currently produced prisms and profiles eliminate the prisms and profiles with the application of the plasticized wood according to the invention, which is based on the fact that the upper flange and the lower flange of the prism or profile are made of plasticized wood and interconnected by filling.

Further significant reduction of the prism weight can be achieved by manufacturing the hollow prism and profile and foaming it e.g. polyurethane foam. The upper and lower flange ensures the transfer of bending stress and the filling ensures stability of the prism.

Wood plasticization achieves the same properties and color shade throughout the cross-section.

From the aesthetic point of view, the natural color shade of plasticized wood can be used in the production of prisms. Resistance of plasticized wood to spongy parasites and weather humidity and its dimensional silage to common woody species is significantly higher.

When used in outdoor applications, prisms and profiles do not need an external coating, but they are simply impregnated with oil or wax. Also for maintenance is only sufficient to overcoat and revive the original color shade of plasticized wood.

When gluing hollow profiles, for example, for window frames and panels, the profile can be foamed with polyurethane foam, thus improving the insulation parameters of the profiles.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1, 2 and 3 is a cross-sectional view of the prisms of claim 1.

In FIG. 1 shows a cross section of a prism where the upper flange I and the lower flange 2 are made of plasticized wood and interconnected by a filling 3. The filling 3 itself may be made of unmodified wood or even of plasticized wood, but without significant compression. Plasticized filling is used to increase wood resistance to parasites and weathering.

In FIG. 2 shows a cross section of a prism where the upper flange I and the lower flange 2 are made of plasticized wood and are connected to each other by the plasticized wood props 4 and the filling 3. Said prism arrangement along the outer periphery exhibits the same shade and parasite resistance properties. and weathering.

In FIG. 3 shows a cross-section through a prism where the upper flange 1 and the lower flange 2 are made of plasticized wood and are connected to one another by uprights 4 and wherein the filling is a polyurethane foam 5.

The polyurethane foam 5 ensures the stability of the prism and significantly reduces the total weight of the prism.

DETAILED DESCRIPTION OF THE INVENTION

By plasticizing the wood and pressing it, the mechanical values of the bending and buckling stresses are increased several times.

By applying plasticized wood, the load-bearing capacity of the prism for bending and bracing is increased several times with the same prism cross-section. When pressing plasticized wood by 50%, a five-fold increase in the bending and buckling stresses is achieved

While maintaining the same load-bearing capacity, the dimensions of the corresponding prism are significantly reduced, thus reducing the cost and weight of the prism.

The prisms according to the invention intended for bending loads allow the production of prisms with varying cross-section. The prism cross-section varies depending on the bending moment.

Claims (4)

PATENT CLAIMS Prisms and profiles with application of plasticized wood, characterized in that the upper flange (1) and the lower flange (2) of the prism or profile are made of plasticized wood and interconnected by a filling (3). 2. Plasticized timber beams and profiles according to claim 1, characterized in that the props (4) are made of plasticized wood and that the props (4), the upper flange (1) and the lower flange (2) are connected to each other by a filler (3). . Prisms and profiles with the application of plasticized wood according to claim 2, characterized in that a polyurethane foam (5) is used as filler. Prisms and profiles with application of plasticized wood according to claim 3, characterized in that plasticised or unplasticized wood is used as a filler (3) at the point of joining the prisms or at the place of application of forces into the prism.