ES2231359T3 - FIBER PLATE. - Google Patents

Abstract

The fiberboard, using fibers with a lignocellulose content and a polyurethane glue as the bonding agent, has a mean bulk density of 350 kg/m<3>. The density curve in the core (1) is constant over a range of two-thirds of the board thickness (s), symmetrically to the center (M). The deviation between the mean density at the core and the maximum density at the covering layer (2) is a maximum of 15% and, at the most, 30 kg/m<3>.

Description

Fiber plate.

The invention relates to a fiber plate that contain lignocellulose and a polyurethane glue as binder.

Such a wood fiber plate is known as example by DE 196 00 478. Such plates are used as plates construction, for lining ceilings and walls or by example in the furniture industry. Known plates are in relation to its size quite heavy and therefore partly uncomfortable to handle. When used as plates construction, must be fixed with special screws, to prevent the plate from breaking at the fixing point and can let go of the base. The plates must be cut carefully, to avoid breakage in the cutting channel. In its set, the treatment of the precise construction plates of a certain experience, to achieve a high quality result. In particular, non-experienced people working in the home, they can handle the plates only with difficulties.

The invention has as a basic task to improve the name plate

To solve the task, the plate described at the beginning is characterized by an average gross density of no more than 350 kg / m 3, the evolution of the density in the core of the plate being essentially constant throughout an area of two thirds of the thickness of the plate symmetrically with respect to the center, and the deviation of the average density in the core from the maximum density in the cover layer of a maximum of 15%, but at most of
30 kg / m 3.

Through this improvement a very light plate with a density gradient essentially constant. Due to its reduced weight, the plate can be handled well. The essentially constant density gradient results in a high rigidity against flexural thrust and also facilitates plate machining. Thus it is possible to make notches by milling of basically any depth, with which the same, despite of its reduced weight, it can be used well as a plate Construction or for furniture. The constant density allows for example fix building plates easily to the base structure, being able to be fixed with an insertion apparatus of pressurized air nails commonly used in commerce. The density constant throughout the section ensures that the nail cannot slam through the plate. It is also possible to provide the edges Side plates of a tongue / groove profile. This way it is possible to join together in a simple way plates that delimit each other and achieve a connection board windproof, which does not need to be isolated especially.

The maximum density in the cover layer can be less than or greater than the average density in the nucleus. When the density in the cover layer is lower than that of the core, they improve clearly the sound insulation properties at the footsteps of the plate.

Through the special improvement of the density, can be fixed, on a plate with a gross density average in the range of 180 kg / m3, a thermal conductivity λ of 0.04-0.05 W / mK. In this way a fiber plate as indicated it attenuates as a mineral insulating material.

The reduced weight of the plate also allows make plate thicknesses of 30 mm or 80 mm, without thereby See especially limited plate handling. This In this way a very good thermal insulation can be achieved with the plate. The plate also has a good sound attenuation, in particular of the sounds of the footsteps. So it can be used not only as a filling of the door, but also as a support structure for floors without insulating flooring, to occupy with carpet floors or similar use. The surface of the plate is so thin that no cement slurry can penetrate into it, which would nullify the attenuation of the sound of footsteps. This way it can be generated An economic structure for the soil. Until today they were used mineral fiber mats, on which a sheet of blocking to prevent the penetration of cement slurries.

Advantageously the plate has a thickness of 30 mm to 80 mm.

With the help of a scheme, it will be described Here is an example of execution of the invention in more detail. It is shown in:

Fig. 1 - a partial detail of a plate in section;

Fig. 2 - the referred raw density profile to the section of a first example of execution;

Fig. 2a - the referred raw density profile to the section of a second example of execution;

Fig. 3 - a distance curve for the manufacture of a plate corresponding to the invention.

In the ultralight fiber wood plate, it is configured a core 1 and two layers of cover 2, which form the top and bottom of the plate. The plate features a average density that is less than or equal to 350 kg / m 3. At core 1 runs the average density over at least two thirds of the plate thickness symmetrically with respect to the line Central M constantly. The average density in the layers of deck 2 deviates by a maximum of 15% of the average density of the core 1, however being a maximum of 30 kg / m 3. In a lateral edge a tongue 3 may be milled from the plate, which corresponds to a slot provided on the side of the opposite edge and that here has not been represented in more detail, with which two plates can be inserted into each other and achieved a tight connection to wind and moisture.

For the manufacture of the plate they spread and make up the wood fibers mixed with the binder with a residual moisture content of 7 to 12% to form a mat. The mat is heated and pressed, providing more thermal energy in a Conti press to form the plate, pressing on a first stage the mat continuously until reaching the set thickness s of the plate (for example 30 mm) and keeping the pressure constant pressing for a long period of time, when the set thickness s. Then it continues to work with a constant pressing pressure. The specific pressing time It is between 7 and 10 seconds. It has been advantageous for a while specific pressing of 8.5 seconds. Very good results were achieved. Good with a feed rate of 130 mm / s.

Figure 3 shows in the distance curve the press adjustment (distance) along the length of your framework. The table of values is reproduced below. corresponding, indicating the distance I the setting for a plate of the traditional constructive type and distance II the adjustment for a plate according to the invention.

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one

Figure 3 shows that for the manufacture of the layer corresponding to the invention continuously reduces the distance in the press. The initial distance of 60 mm for a plate with the final thickness of 31.45 mm it is well above the 44 mm of Traditional plate manufacturing.

Claims (4)

1. Plate of lignocellulosic fibers and a tail of polyurethane as binder, characterized in that the plate has a gross density not exceeding 350 kg / m 3, the evolution of the density in the core (1) running essentially constant over a two-thirds range of the plate thickness (s) ) symmetrically with respect to the center (M), and the deviation of the average thickness in the core (1) from the maximum density in the cover layer (2) of a maximum of 15%, but a maximum of 30 kg / m 3. 2. Plate according to claim 1, characterized by a thermal conductivity (λ) of 0.04-0.05 W / mK. 3. Plate according to claim 1 or 2, characterized by a thickness (s) of at least 30 mm, in particular from 30 mm to 80 mm. 4. Plate according to one of claims 1 to 3, characterized in that at least two opposite side edges a tongue-groove profile is configured.