Abstract: A method of preparing a plastic-based composite profile comprised of a plastic mass containing a plurality of wood particles embedded in the plastic mass by bringing a plurality of dried wood particles and a thermoplastic polymer together with optional additives together to form a plastic-wood particle mixture, blending the plastic-wood particle mixture in blending means at a temperature sufficiently high to at least partially melt the thermoplastic polymer so as to be capable of uniformly blending with the wood particles to form a blended plastic-wood particle mass constituting an initial agglomerate; transforming the initial agglomerate into a profile preform by subjecting the agglomerate to the action of a double screw multi-zone extrusion means thereby shaping the profile preform into a profile by pushtrusion so that the agglomerate flows under pressure as a plastic plug flow in the extrusion means and through orientation and shaping stages to thereby obtain the composite profile.

Abstract: A compound construction element formed of a composite material which composite material includes a matrix of thermoplastic synthetic material including wood particles or other cellulose-containing particles in a content on the order of 50% by weight or more, wherein also one or more continuous additional reinforcement elements are attached to the exterior or incorporated in the interior of the elements, that result in the reduction of length expansion due to moisture uptake.

Abstract: A method for manufacturing a compound construction element, in an extrusion process wherein a composite material is pressed through an extrusion die, which composite material includes a matrix of thermoplastic synthetic material including wood particles or other, cellulose containing particles in a content on the order of 50% by weight or more, wherein also one or more elongated additional elements are passed through the extrusion die, which additional elements are brought into tight engagement with the composite material, after which the compound element is shaped and preferably cooled in a die.

Abstract: The invention relates to a plastic-based composite product which consists at least partially of a plastic in which a material consisting substantially of particles is homogeneously embedded, which particles have tensile strength in at least one principal direction. The invention provides a product of the stated type which has the special feature that the particles comprise: small particles, in particular plates or fibres, with a random orientation and a length of 0.2-2 mm; and large particles with a dominant orientation, for instance 80-95%, of the said principal direction of the particles in a chosen product principal direction and a length in the particle principal direction of about 2-6 mm.