EP2148020B1 - Large format osb board with improved characteristics, in particular for the construction industry - Google Patents

Abstract

Wood strand plate has a minimum width of 2.6 m and a minimum length of 7.0 m. Its modulus of flexural elasticity in the principal loading direction is at least 7000 N/mm 2>.

Description

The present invention relates to an OSB board according to the preamble of claim 1. A corresponding OSB board is known, for example, from US 5,156,074 DE 195 03 343 A1 ,

Furthermore, the invention relates to a component according to the preamble of claim 12 and a use of an OSB panel according to claim 14.

An OSB board in the sense of this invention consists of at least one layer which is constructed with flat wood chips, so-called strands. The strands of this layer are oriented in a preferred direction (here in the production direction = plate longitudinal direction). Even if one speaks here only of a single-layer plate, it is common in the course of the production of this plate, a lower and a mirror-like upper cover layer combined into a homogeneous in itself position.

In multilayer construction, the above-described layer forms the lower and upper cover layer and between them is the middle layer (in a 3-layer design), which has no preferred orientation of the stands. This distribution is also called "random" in technical language. The middle layer is the innermost layer of the plate. A 3-layered plate thus consists of an upper and a lower cover layer and a middle layer, a 5 or more layered plate of an upper and lower cover layer, a central layer and layers between the upper and lower cover layer and the Central location. A preferred embodiment of the invention is a 3-layer plate, 5-layer or multi-layer plates (an odd number of layers being useful). Even numbers of layers are just as conceivable.

The invention is based on the technical problem of providing an OSB board which is suitable for large-scale use and, for example, can also be used for the construction of buildings.

The above-indicated technical problem is solved by an OSB board with the features of claim 1. Further embodiments are specified in the dependent claims and described in detail below.

The present invention describes a large-sized wood-based panel, a component produced therefrom and a method for producing a large-sized plate with high mechanical properties such as the characteristics of bending, tension and pressure, without raising the specific gravity of the plate above the usual level. Furthermore, technological features of an OSB board are described, from which one can derive these increased mechanical properties and possible uses of this OSB board.

Influencing parameters for the preferred embodiments of the present invention are the beach geometry (length, width, thickness), the alignment of the beach plies, the orientation of the strands within a ply in a desired direction, the proportion and type of binder or the mixture of several binders, the proportion of additives such. As hardeners and paraffins, the ratio between the thickness between the outermost layer and the middle layers or the middle layer, the density profile, which is influenced by the targeted control of process parameters and ultimately the total thickness of the plate and the plate format, which on the intended use are coordinated.

The present invention as well as its preferred embodiments make it possible to achieve the following mechanical-technological properties. These are to be understood as minimum values and indicated as mean values. The dispersion of the parameters is low due to the production. The properties are determined according to EN 789: 1995 "Timber structures - Test method - Determination of the mechanical properties of wood-based materials". This standard regulates the determination of characteristic properties of wood-based materials used for structural purposes in the construction sector. The term "longitudinal" means that the beach orientation of the top skin layer is parallel to the sample length as defined by EN 789, and "transverse" means beach alignment transverse to the sample length. The following information refers to plates with a minimum thickness of 25 mm. Of thinner plates are usually expected even higher characteristics.

Bending strength perpendicular to the plate plane: longitudinal: ≥30.0 N / mm ² transverse: ≥15.0 N / mm ²

Bending elastic modulus perpendicular to the plate plane: longitudinal: ≥ 7000 N / mm ² transverse: ≥3000 N / mm ²

Shear strength in plate plane: longitudinal: ≥1,2 N / mm ² transverse:> 1.40 N / mm ²

Shear modulus in plate plane: longitudinal: ≥200 N / mm ² transverse: ≥190 N / mm ²

Pressure resistance "moist" in plate plane: longitudinal: ≥24.0 N / mm ² transverse: ≥16.5 N / mm ²

Pressure elastic modulus "damp" in plate plane: longitudinal: ≥5000 N / mm ² transverse: ≥3200 N / mm ²

For the wet tests (labeled "wet"), the specimens were stored in water at room temperature for a period of 15 hours prior to testing, with the tests being performed on drained specimens.

Tensile strength in plate plane:
longitudinal: ≥ 20.0 N / mm ²

Tensile modulus at plate level:
longitudinal: ≥ 6000 N / mm ²

Pressure resistance in plate plane:
longitudinal: ≥ 20.0 N / mm ²

Print elasticity module in plate plane:
longitudinal: ≥ 6000 N / mm ²

In a further embodiment of the invention, the following properties are given:
Bending strength perpendicular to the plate plane: longitudinal: ≥ 35.0 N / mm ² transverse: ≥ 10.0 N / mm ²
Bending elastic modulus perpendicular to the plate plane: longitudinal: ≥ 8000 N / mm ² transverse: ≥ 2000 N / mm ²

The properties of the wood-based panels according to the invention are influenced by the beach geometry and the most uniform design of the strands of the cover layer, the ratio of thickness of the cover layers to total thickness or the basis weight of the cover layer to the total basis weight of the plate and the average specific gravity of the plate (density).

• Strands für die äußeren Lagen (Decklage):
  • Länge: 130 - 180 mm
  • Breite: 10 - 30 mm
  • Dicke: 0,4 - 1,0 mm
• Strands für die Mittellage:
  • Länge: 90 - 180 mm
  • Breite: 10 - 30 mm
  • Dicke: 0,4 - 1,0 mm

It has been found that the following parameters with regard to the beach dimensions are advantageous for achieving the desired mechanical-technological properties:

• Strands for the outer layers (cover layer):
  • Length: 130 - 180 mm
  • Width: 10 - 30 mm
  • Thickness: 0.4 - 1.0 mm
• Strands for the middle layer:
  • Length: 90 - 180 mm
  • Width: 10 - 30 mm
  • Thickness: 0.4 - 1.0 mm

The two outer layers (outer layers) should consist in the finished product of at least 30 percent by weight of the total scattered chip quantity, which in sum of upper and lower cover layer corresponds to a proportion of at least 60%. The remaining 40% account for the middle layer in a 3-layer plate. The specific weight of the plate should not exceed 700 kg / m ³ , a value equal to or less than 650 kg / m ³ is desirable. This information refers to dry plates.

The production of the strands is usually made of round wood, which is preferably present in debarked condition. The log logs are fed to a flaker, which produces strands of the desired dimension in a single operation by means of rotating tools. A multi-stage production of the beaches is just as conceivable as z. B. from a rotary veneer, which is crushed into strands in a further step.

Advantageous for achieving the desired properties is that the proportion of fines in the individual layers is reduced to a minimum. Fines are strands that are significantly different from the dimensions of the strands described above. Primarily during the production of fines should be avoided such as. B. by a gentle debarking and by regular sharpening of the cutting tools of the flaker. After Strandherstellung a separation of the fine material from the beach but also conceivable.

Of course, even with the most careful beach preparation and conscientious separation, the proportion of fines can only be reduced to a still tolerable minimum proportion, but can not be prevented. The proportion of fines, can be quite 10 to 15 weight percent based on the weight of the finished plate.

The wood of the beach is not relevant. In principle, all types of wood such. As poplar, birch, beech, oak, spruce, pine and the like possible. The jaw has been particularly suitable due to its good Chipping properties and exposed due to their relatively high resin content.

To reduce the swelling properties paraffins and / or waxes are added. The application can take place in the form of a melt at the required elevated temperature (liquid wax application) or for emulsions at about room temperature.

As binder types, urea-formaldehyde glues (UF), melamine-formaldehyde glues (MF), phenol-formaldehyde glues (PF), binders based on isocyanate (eg PMDI) but also binders based on acrylates have proven successful. In most cases, a mixture of at least two of these types of binder is used, but also mixtures of several types of glue is conceivable. The term "mixture" is understood to mean not only a mixture of different types of ready-to-use binders, but also a mixture of various of the cited types, which already results in the course of production as a mixture. So z. As melamine-urea-formaldehyde glues (MUF) or melamine-urea-phenol-formaldehyde glues (MUPF) by co-cooking in the same reaction vessel (reactor) are produced. The individual layers of the plate may also contain different types of binders and mixtures thereof, wherein it is advantageous for multi-layer plates for stability reasons, those layers, which are each arranged - in relation to the plate surfaces - in the same position, with the same binder type or to provide the same mixture. Thus, it has been found that the requirements of the invention can be achieved very well in a 3-layer plate when the upper and lower cover layer with a MUPF binder is provided and the middle layer with an isocyanate-based binder (PMDI).

The proportion of binder and the binder type are decisive for the desired mechanical and technological properties. The content of binder depends on the type of binder. Binder contents for UF, MF, PF and their mixtures are in the range between 10 and 15 wt.% (For mixtures as the sum of the components used) calculated as solid resin based on the dry matter wood strands. When using isocyanates, the binder content can be reduced to 5 to 10 wt.%.

The gluing of the beaches takes place before the beach mat is formed. Usually large sized Beleimtrommeln are provided for this, which allow a continuous gluing in the run. The drums rotate around their own longitudinal axis and thus keep the introduced beach material constantly in motion. In the drums, a fine glue mist is created by means of nozzles, which is reflected evenly on the beach. The drums have built-in components, in order to be able to constantly pick up the beach material and to transport the beach material from the inlet into the drum to the outlet. An oblique inclination of the drum in the longitudinal direction can assist the forward movement of the strands.

The achievement of the desired mechanical and technological properties is influenced by the targeted orientation of the strands.

Particularly in the case of a single-layered plate and the cover layers of multilayer plates, the orientation of the strands should preferably be in one direction (for example parallel to the plate length = production direction), with a high degree of orientation. The% set of chips, which may deviate more than +/- 15 ° from the selected direction of orientation is small. Nevertheless, in the "transverse" direction of the plate, there are still sufficient strengths and stiffnesses, since the scattering process always gives a deviation from the desired orientation.

For 3-ply or multi-ply panels, the target orientation of the strands will depend on the position of the beach ply within the panel. The two outermost layers, the cover layers, should be aligned parallel to the plate length as previously described for a single-layer plate. Considering a 3-layered OSB board, the strands of the single center layer are oriented without a preferred direction (random).

A plate structure of more than 3 layers is also conceivable. In general, the number of layers will be odd, the beach orientation of the cover layers and the middle layer as described above and the orientation of the other layers may be arbitrary. Thus, it is conceivable that the preferred beach orientation of these other layers is crosswise to the beach orientation of each outer adjacent location. A random orientation of individual layers is also possible.

The shaping of the beach mat from the various superimposed layers is accomplished by a spreader. For each layer is usually a scattering head available. This The task is to arrange the glued strands in the desired direction or randomly orient them. After spreading the mat, the pressing takes place to a stable plate-shaped product under the action of pressure and temperature. This can be done either in cycle presses (single or multi-day presses) or in continuous presses. The latter make it possible to produce an endless plate belt which can be cut into the desired formats.

The plates can be ground after production. This achieves a homogeneous plate thickness with small thickness tolerances and improved conditions for gluing two or more plates to components as described below. However, with sufficient board surface quality and sufficient thickness tolerance of the boards, gluing without prior sanding is also possible.

Fig. 1

ein erstes Ausführungsbeispiel einer erfindungsgemäßen OSB-Platte,

Fig. 2

den Schichtaufbau der OSB-Platte,

Fig. 3

zwei Beispiele eines aus OSB-Platten aufgebauten Bauelementes und

Fig. 4

den Aufbau eines großflächigen Bauelementes aus OSB-Platten.

The invention is explained in more detail below with reference to embodiments, reference being made to the accompanying drawings. In the drawing show

Fig. 1

A first embodiment of an OSB board according to the invention,

Fig. 2

the layer structure of the OSB board,

Fig. 3

two examples of a constructed of OSB panels and component

Fig. 4

the construction of a large-scale component made of OSB boards.

FIG. 1 shows a wooden material plate 1 as described above, which is composed of three beach layers. The upper strand layer 2 shows a preferred orientation of the strands 5 in the longitudinal direction of the plate. It can be seen that the strands 5 of the cover layer 2 are not aligned strictly parallel to the plate length, but nevertheless given a high degree of orientation. The middle layer 3 consists of strands 6, which are somewhat smaller in their dimensions than the strands of the cover layers 2 and 4. The orientation of the strands 6 of the middle layer 3 is randomly oriented. The lower cover layer 4 is constructed in mirror image to the upper cover layer 2. The terms "plate length" and "plate width" for the in FIG. 1 shown plate 1 are selected as reference only as an example of a section of a large-sized plate and do not match the real dimensions plate length and plate width. FIG. 1 also shows that the thickness s1 of the two cover layers (both the lower cover layer 4 and the upper cover layer 2 constructed in mirror image) is each about 30% of the total thickness s of the plate and the thickness s2 of the middle layer 3 is about 40%.

The individual plates 1 produced by the method described above can have a thickness s up to about 50 mm and formats of 2.8 x 15 m and can be used in a variety of applications in the construction sector. The plate length of 15 m should not be understood as an upper limit. However, it has been shown that both for the production and subsequent plate manipulation in the course of further processing here is a reasonable order of magnitude at 10 to 15 m.

If several plates (eg 3 x 32 mm = 96 mm) are combined to form a sandwich element of greater thickness, large components are obtained. The FIG. 2 schematically shows such a component 10 which is made of 3 individual plates 1. For this purpose, the individual plates 1 with an adhesive such. B. isocyanate at least partially bonded over a large area. This component can, for. B. be used in house construction for exterior and interior walls, with the advantages that elements corresponding to the wall length without joints over a full storey height (up to 2.8 m) can be produced. The common house-building practice (eg single-family house, multi-family house) shows that wall elements with a length between 10 and 15 m are quite sufficient to be able to produce entire wall, ceiling and roof elements. With regard to the length of plates or components is also to be considered that in the course of the transport of these parts from the place of manufacture to the place of further processing or the use certain limits are present. From this point of view, the meaningful maximum plate and component length is also to be understood. The required recesses such as windows and doors can be worked out by means of conventional processing devices for solid wood such as saws and milling cutters.

From the large-area sandwich elements mentioned above, however, it is also possible to produce carriers in such a way that strips of the desired carrier width or carrier height are produced therefrom. The strips are cut out according to the length of the plate so that a length of support up to 15 m is possible. These carriers can be combined on one or both sides with large-format OSB boards to form ceiling, wall or roof elements with sufficient stability to bridge over several meters of overvoltage.

The FIG. 3 shows 2 different embodiments. In Figure 3 a ) consists of the ceiling, wall or roof element 20 of a support 22, an upper plate 21 and a lower plate 23. The plate 21 consists in itself again of 2 individual plates 1, the carrier 22 consists in itself again of 3 individual plates. 1 The plates 21 and 22 are connected to the carrier 22 positively or positively. If the component 21 is a ceiling element, then the plate 21 assumes the function of the floor of the upper floor and the plate 23 the function of the ceiling of the lower floor. The same applies mutatis mutandis to the FIG. 3 b) , Here, the component 20 consists of an upper plate 31, which is constructed only of a single plate 1, further from the carrier 32 and from the lower plate 33. The carrier 32 is arranged in contrast to the carrier 22 lying.

The FIG. 4 shows the structure of a large-area component 20 which is composed of a plurality of individual plates 1. The length L can be up to 15 m and the width B up to 2.8 m. The carriers 23, 33 are firmly connected to the plates 21, 31 and 22, 32. As a result, the component in combination with the high mechanical and technological properties of the individual plates 1 itself has a high degree of wearability.

EXAMPLE 1:

The 3-layer OSB board of the following example was manufactured on an industrial plant.

The production of the strands for the middle and top layer takes place until the mat formation on separate processing lines. Stranded logs are made from decorticated pine logs with a length of approx. 150 mm, a width of between 10 and 25 mm and a thickness of between 0.5 and 0.8 mm. Fines are, as far as possible, already separated. Subsequent drying reduces the moisture content of the strands of both layers to between 3 and 5%. Before gluing, the proportion of fines is minimized by means of screening devices. The gluing is carried out in Beleimtrommeln, wherein the top layer with about 13 wt.% Melamine-urea-phenol-formaldehyde glue (solid resin based on dry wood mass) and the middle layer with 8 wt.% Of a PMDI binder were mixed.

• Biegefestigkeit nach EN 789 senkrecht zu Plattenebene, längs: 36,9 N/mm²
• Biegeelastizitätsmodul nach EN 789 senkrecht zu Plattenebene, längs: 8322 N/mm² (maximaler Wert 8816 N/mm²)
• Dichte bei ca. 12% Feuchtigkeit: 645 kg/m³
• Plattendichte bei 0% Feuchtigkeit: 585 kg/m³

Then the matting takes place on a width of about 2.80 m, wherein first the strands of the lower cover layer are placed with a beach orientation in the production direction, then the random-scattered middle layer without a unidirectional beach orientation and finally the upper cover layer whose beach orientation also in Production direction is done. The basis weight of the lower cover layer based on the total mat weight is 36%, that of the middle layer 28% and the upper cover layer also 36%. The mat thus obtained is pressed under the action of pressure and temperature to an OSB plate with a final thickness of 33.5 mm and then the continuous plate produced in a continuous process in formats of 12.0 x 2.80 m separated. After a maturation time of 5 days, the plate has the following properties (average of 5 experiments):

• Bending strength according to EN 789 perpendicular to plate plane, longitudinal: 36.9 N / mm ²
• Flexural modulus according to EN 789 vertical to plate plane, longitudinal: 8322 N / mm ² (maximum value 8816 N / mm ² )
• Density at approx. 12% moisture: 645 kg / m ³
• Plate density at 0% humidity: 585 kg / m ³

• Biegefestigkeit nach EN 408 senkrecht zu Plattenebene, längs: 23,8 N/mm²
• Biegeelastizitätsmodul nach EN 408 senkrecht zu Plattenebene, längs: 6393 N/mm²

Three such plates thus obtained were ground to a thickness of 32 mm and bonded together by means of an adhesive based on isocyanate with each other over the entire surface to form a plate element with a total thickness of 96 mm under the action of pressure. The sandwich element thus obtained has the same dimensions as the individual plates (2.80 x 12.0 m) and has the following properties (average of 5 experiments):

• Bending strength according to EN 408 perpendicular to plate plane, longitudinal: 23.8 N / mm ²
• Flexural modulus according to EN 408 perpendicular to plate plane, longitudinal: 6393 N / mm ²

(The DIN EN 408, issue date March 2001, entitled "Timber structures - Structural timber and glued laminated timber - Determination of some physical and mechanical properties 'lays down test methods for the determination of dimensions, moisture content, density and describes the conditions of test specimens of structural and laminated timber This standard has been applied mutatis mutandis to the testing of the sandwich element described above).

EXAMPLE 2

The 3-layer OSB board of the following example was manufactured on an industrial plant.

The production of the strands for the middle and top layer takes place until the mat formation on separate processing lines. Strands with a length of approx. 140 mm, a width of between 10 and 30 mm and a thickness of approx. 0.6 mm are produced from debarked pine trunks. Fines are, as far as possible, already separated. Subsequent drying reduces the moisture content of the strands of both layers to between 3 and 5%. Before gluing, the proportion of fines is minimized by means of screening devices. The gluing is done in Beleimtrommeln, wherein the top layer with about 7.0 wt.% PMDI (solid resin based on dry wood mass) and the middle layer with 5.5 wt.% Of a PMDI binder were mixed.

• Biegefestigkeit nach EN 310 senkrecht zu Plattenebene, längs: 51,5 N/mm²
• Biegeelastizitätsmodul nach EN 310 senkrecht zu Plattenebene, längs: 8352 N/mm² (maximaler Wert 9004N/mm²)
• Zugfestigkeit nach EN 408 in Plattenebene, längs: 25,3 N/mm² (Mittelwert aus 4 Versuchen)
• Zugelastizitätsmodul nach EN 310 in Plattenebene, längs: 7392 N/mm² (Mittelwert aus 4 Versuchen)
• Plattenfeuchtigkeit: ca 8%
• Plattendichte bei 0% Feuchtigkeit: 629 kg/m³

Then the matting takes place on a width of about 2.80 m, wherein first the strands of the lower cover layer are placed with a beach orientation in the direction of production, then the random-scattered middle layer without an undirectional beach orientation and finally the upper cover layer whose beach orientation also in Production direction is done. The basis weight of the lower cover layer based on the total mat weight is 35%, that of the middle layer 30% and the upper cover layer also 35%. The resulting mat is pressed under the action of pressure and temperature to an OSB plate with a final thickness of 24.8 mm and then the endless plate produced in a continuous process in formats of 12.0 x 2.80 m is separated. After a maturation period of 5 days, the like in Example 1 also uncut plate following properties (average of 10 experiments)):

• Bending strength according to EN 310 perpendicular to plate plane, longitudinal: 51.5 N / mm ²
• Flexural modulus according to EN 310 perpendicular to plate plane, longitudinal: 8352 N / mm ² (maximum value 9004N / mm ² )
• Tensile strength according to EN 408 in plate plane, longitudinal: 25.3 N / mm ² (average of 4 tests)
• Tensile modulus according to EN 310 in plate plane, longitudinal: 7392 N / mm ² (average of 4 experiments)
• Plate humidity: about 8%
• Plate density at 0% humidity: 629 kg / m ³

EXAMPLE 3

The 1-layer OSB board of the following example was manufactured on an industrial plant.

Strands with a length of approx. 140 mm, a width of between 10 and 30 mm and a thickness between 0.5 and 0.6 mm are produced from debarked pine trunks. Fines are, as far as possible, already separated. Subsequent drying reduces the moisture content of the strands to between 3 and 5%. Before gluing, the proportion of fines is minimized by means of screening devices. The gluing is done in Beleimtrommeln, with about 7,0Gew. % PMDI (solid resin based on wood dry matter) were mixed.

• Biegefestigkeit nach EN 310 senkrecht zu Plattenebene, längs: 47,2 N/mm²
• Biegeelastizitätsmodul nach EN 310 senkrecht zu Plattenebene, längs: 8488 N/mm²
• Zugfestigkeit nach EN 408 in Plattenebene, längs: 24,2 N/mm² (Mittelwert aus 4 Versuchen)
• Zugelastizitätsmodul nach EN 310 in Plattenebene, längs: 7275 N/mm² (Mittelwert aus 4 Versuchen)
• Plattenfeuchtigkeit: ca. 8%
• Plattendichte bei 0% Feuchtigkeit: 614 kg/m³.

Subsequently, the unidirectional mat formation in production direction to a width of about 2.80 m with two successive scattering heads. A "cross" or "random" oriented middle position is not scattered. The resulting mat is pressed under the action of pressure and temperature to an OSB plate with a final thickness of 24.7 mm and then the continuous plate produced in a continuous process in formats of 12.0 x 2.80 m is separated. After a maturing time of 5 days, the uncut plate has the following properties (mean values from 10 experiments):

• Bending strength according to EN 310 perpendicular to plate plane, longitudinal: 47.2 N / mm ²
• Flexural modulus according to EN 310 perpendicular to plate plane, longitudinal: 8488 N / mm ²
• Tensile strength according to EN 408 in plate plane, longitudinal: 24.2 N / mm ² (average of 4 tests)
• Tensile modulus according to EN 310 in slab plane, longitudinal: 7275 N / mm ² (average of 4 tests)
• Plate moisture: approx. 8%
• Plate density at 0% humidity: 614 kg / m ³ .

Claims (14)

1. Large-size OSB panel with a length of at least 7.0 m, characterised

   - in that the panel has increased mechanical-technological properties,

   - in that the panel has a width of at least 2.60 m and

   - in that the compressive strength in the panel plane in the longitudinal direction is ≥ 24 N/mm², wherein the thickness of the panel is at least 28 mm, wherein the panel contains a percentage of binder of 6 to 18 % calculated as solid binder based on the dry mass of wood, and wherein paraffin and/or wax has been added to reduce the swelling properties such that the percentage in the panel is between 0.5 and 1 % calculated as solid based on the dry mass of wood.
2. OSB panel according to claim 1,
   characterized in that
   the panel width is at least 2.80 m and/or the panel length is at least 11 m.
3. OSB panel according to claim 1 or 2,
   characterized in that
   the shear strength parallel to the panel plane in the longitudinal direction is at least 1.2 N/mm².
4. OSB panel according to one of the claims 1 to 3,
   characterized in that
   the shear modulus parallel to the panel plane in the longitudinal direction is at least 200 N/mm².
5. OSB panel according to one of claims 1 to 4,
   characterised in that
   the tensile strength in the panel plane in the longitudinal direction is at least 20.0 N/mm².
6. OSB panel according to one of claims 1 to 5,
   characterised in that
   the OSB panel consists of an odd number of layers, preferably of 3 layers, wherein, in particular, the strands of the middle layer and/or the middle layers have an arrangement offset by 90° relative to the desired orientation of the directly adjacent outer layer, wherein the maximum deviation is plus/minus 30°.
7. OSB panel according to claim 6,
   characterised in that
   the strands of the cover layers have a length between 140 and 180 mm, a width between 5 and 30 mm and a thickness between 0.4 and 1.0 mm.
8. OSB panel according to claim 6 or 7,
   characterised in that
   the strands of the central layer and/or the central layers have a length between 90 and 180 mm, a width between 5 and 30 mm and a thickness between 0.4 and 1.0 mm.
9. OSB panel according to one of claims 6 to 8,
   characterised in that
   the thickness of the panel is between 28 and 42 mm.
10. OSB panel according to one of claims 6 to 9,
    characterised in that
    the thickness of at least one of the outer face layers is at least 30 % of the total thickness of the panel.
11. OSB panel according to one of the preceding claims,
    characterised in that
    the panel has a length of up to 15 m and a width of up to 2.8 m.
12. Component for use as a wall, ceiling or roof element

    - with several panels according to one of the requirements 1 to 11, characterised in that

    - at least two OSB panels are provided as large-size panels with increased mechanical-technological properties, and

    - the OSB panels are at least partially glued together.
13. Component according to claim 12,
    characterised in that
    the OSB panels are connected over a large area without joints and represent a load-bearing wall construction comprising at least one storey height.
14. Use of a large-size OSB panel according to one of claims 1 to 11 with increased mechanical-technological properties, a width of at least 2.60 m and a length of at least 7.0 m as a wall, ceiling or roof element in house construction.

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