Abstract: Apparatus to reduce size of a light, dry, fibrous material, particularly straw, with a material supply area (1), an impeller (2) and a material release area (5) for the size reduced material as well as a ring element (4), which is arranged with a distance to the impeller (2), wherein least one size reduction tool (6) is provided at the impeller (2) and/or at the ring element (4), that is provided angular shaped, particularly L-shaped, or having the shape of a polygonal, particularly ashlar-formed, hollow profile or solid profile. Splitting particularly hard, closed fibrous structures such as nodes of straw can thereby be enabled to a major portion without excessive shortening of the straw.

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).

Abstract: Apparatus to reduce size of a light, dry, fibrous material, particularly straw, with a material supply area (1), an impeller (2) and a material release area (5) for the size reduced material as well as a ring element (4), which is arranged with a distance to the impeller (2), wherein least one size reduction tool (6) is provided at the impeller (2) and/or at the ring element (4), that is provided angular shaped, particularly L-shaped, or having the shape of a polygonal, particularly ashlar-formed, hollow profile or solid profile. Splitting particularly hard, closed fibrous structures such as nodes of straw can thereby be enabled to a major portion without excessive shortening of the straw.