SHEET, BOARD OR PANEL

Abstract

Sheet, board or panel, in particular an OSRB (1)—Oriented Structural Reed Board—comprising a layer of material (2) made up of pressed reeds having a multiplicity of stems which are split predominantly longitudinally, so that it is also the case that the insides of the stems, at least in part, are accessible to a binder, wherein the binder is able to hold together the reeds for forming a solid sheet, board or panel. It is thus possible to provide a biocomposite sheet, board or panel based on sustainable raw materials which has improved properties and strength and requires only a particularly low level of production outlay. A further aspect of the invention relates to a method for producing an OSRB (1).

Claims

1. Sheet, board or panel comprising a layer of material (2) of compressed reed having a multiplicity of strands, which are mostly split longitudinally, so that at least a part of the inside of the strands is accessible to a binder, wherein the binder allows to binding the reed for forming a solid sheet, board or panel.

2. Sheet, board or panel of claim 1, wherein the strands of the reed are afloat spears.

3. Sheet, board or panel of claim 1, wherein the layer of material (2) also comprises strands of straw.

4. Sheet, board or panel of claim 1, wherein 100% of the strands provided for the layer of material (2) are of reed.

5. Sheet, board or panel of claim 1, wherein a portion of the strands of reed is provided for the layer of material (2) that amounts to at least 10%.

6. Sheet, board or panel of claim 1, wherein a portion of the strands of reed is provided for the layer of material (2) that amounts to at least 40%.

7. Sheet, board or panel of claim 1, wherein when providing the strands based on different raw materials, blending (10) of the strands is provided prior to compressing (18).

8. Sheet, board or panel of claim 1, wherein a plurality of the strands of the layer of material (2) are oriented in a predetermined direction and/or substantially in parallel.

9. Sheet, board or panel of claim 1, wherein a portion of at least 10% of the strands have a length of at least 6 mm and at most 15 mm.

10. Sheet, board or panel of claim 1, wherein the layer of material (2) of compressed reed forms an outer layer (2), which adjoins to a core layer (3).

11. Method for producing a sheet, a board or a panel comprising a layer of material of compressed reed having a multiplicity of strands, which are mostly split longitudinally, so that at least a part of the inside of the strands is accessible to a binder, wherein the binder allows to binding the reed for forming a solid sheet, board or panel, wherein strands that are mostly split longitudinally are covered with a binder and are compressed.

12. Method of claim 11, wherein strands of different raw materials, in particular including straw, are blended (10).

13. Method of claim 11, wherein prior to scattering (17) the strands onto a conveyor belt for forming a mat, the strands are blended (10) prior to shortening (12) the strands or cutting (11) the raw materials to a smaller length.

Description

[0053] In the following, the invention is elucidated in more detail based on embodiment examples of a sheet, a board or a panel, which are schematically illustrated in the figures, and the embodiments as well as additional advantageous embodiments are described in more detail with reference to the drawings.

[0054] It shows:

[0055] FIG. 1: Schematic illustration of an OSRB construction panel

[0056] FIG. 2: Schematic illustration of a cross section through an OSRB plate, board or panel with several layers of material

[0057] FIG. 3: Schematic illustration of a cross section through an OSRB plate, board or panel with one layer of material

[0058] FIG. 4: Flow chart with the steps for the production of an OSRB plate, an OSRB board or an OSRB panel based on reed and straw.

[0059] The FIG. 1 shows an OSRB construction panel 1—surface structure not shown—having a thickness in the range of at least 3 mm, preferably 8 mm, to at most 40 mm or even higher.

[0060] Load bearing OSRB construction panels 1 have for example a minimum density of 500 kg/m.sup.3 to above 900 kg/m.sup.3 at 15 mm panel thickness. Not load bearing OSRB construction panels commonly have a lower density, however at least 400 kg/m.sup.3 or 500 km/m.sup.3.

[0061] One embodiment example of a 100% reed-construction-panel may achieve a density of above 800 kg/m.sup.3. A particularly high strength can thereby be made possible. Compared to construction panels based on e.g. straw, a higher compatibility (tolerance) for a person suffering from an allergy can be enabled.

[0062] One embodiment example of a reed-blend-construction-panel in form of a flooring panel on the basis of straw under addition of reed is particularly suitable for wet areas like in the bath room compared to a pure OSSB panel. A particularly low swelling at the gap between two flooring panels in consequence of wetness can be made possible.

[0063] The FIG. 2 shows the cross section through an ORSB construction panel with two outer layers 2 and two core layers 3. The layers 2, 3 have a different orientation of the strands.

[0064] An OSRB board, an OSRB sheet or OSRB panel basically have a multi-layer-structure with one, two, three, four, five or more layers. Different construction panel thicknesses and the properties can thereby be purposefully influenced.

[0065] In particular, the surface 4 is covered by a color or decor layer and/or protected from environmental impacts by a sealing layer.

[0066] The layer of material of reed is usually an outer layer 2. However, a layer of material of reed may also be used as core layer 3 in order to achieve a particularly high strength.

[0067] Preferably, further sustainable materials without strand structure like for example recycling material and/or cost efficient filler materials may be either added to the strand material or be used alone for the core layer 3, though. A biocomposite construction panel with particularly good mechanical properties can thereby be provided in different thicknesses with low production outlay.

[0068] The FIG. 3 shows the cross section through an OSRB construction panel having only one layer of material 2 of reed, i.e. reed alone or together with straw and/or further strands of other plants. Also at a one-layer-panel, the surfaces 4 can be provided with one additional cover layer as described above.

[0069] The FIG. 4 shows the steps 10 to 19 for the production of an OSRB plate, an OSRB board or an OSRB panel—thus of OSRB construction panel 1—based on reed and one further raw material. The steps are described in the following applying the example of straw as further raw material:

[0070] Already as first step, a blending 10 of the reed strands and straw strands with each other is conducted. What is following is a cutting 11 preferably to a length of 100 to 1000 mm, preferably 300 to 800 mm, particularly preferred 400 to 600 mm.

[0071] Subsequent to that, it is conducted a shortening 12 of the strands as well as a longitudinally splitting 13 and a dewaxing 14 of the strands by a solvent for an improved adhesion of the thereafter added binder 15. Not split strands and/or impurities such as metal are removed. Finally, a scattering 17 of the strands is conducted onto a conveyor belt under longitudinal alignment and/or grading (sorting) by length over an area in longitudinal direction over the conveyor belt. The thereby formed mat consisting of piled up strands is compressed 18 in a hot press at 100° C. to 300° C. and subsequently cut to size 19 to the desired dimensions and contour of the desired sheet, board or panel.

[0072] By means of additional surface treatments such as sand blasting and/or coating, the created sheets, boards or panels can be used as finished products for the interior construction such as wall covering or floor covering or for furniture, doorframes as well as container material.

[0073] A 100%-reed-construction-panel can be produced according to the steps of FIG. 4 without the step of blending 10.