Composite formed board

摘要

Composite formed boards made of plastic and organic material with a fibrous structure are described. The composite is a foamed mix having a density lower by at least 10% and preferably 20%, than the density of a solid organic-plastic composite made of the same components. The foamed mix is bonded permanently and inseparably with a solid plastic layer, at least from a side opposite to a homogeneous rubber-polyurethane composite. The thickness of the solid plastic layer is smaller than that of the organic-plastic layer (preferably at least five times and most preferably at least fifteen times) and that of the rubber-polyurethane layer (preferably at least fifteen times and most preferably at least twenty-five times). The solid plastic layer may have a grooved structure or an impressed structure with a concavity directed inwardly. The solid plastic layer is preferably bonded with the organic-plastic layer by a co-extrusion joint.

主权项

1. A composite formed board, made of rubber aggregate combined with polyurethane resin in a form of homogeneous rubber-polyurethane composite made into a specified shape with a specified height, said rubber-polyurethane blend is bonded with a composite made of plastic and organic material with a fibrous structure to form a joint, said joint is a permanent bond in an area of the joint and an impermanent bond in a contact area outside the joint, wherein the joint has a V-shape or a Y-shape or an inverted Δ-shape, constituting a material protrusion of the organic-plastic composite into a volume of the rubber-polyurethane composite, wherein a base of the joint is located in the plane of contact of both composites in the contact area outside the joint, and wherein said organic material with a fibrous structure is selected from the group consisting of wood-base material, wood fibre material, bamboo fibre material and straw fibre material, the rubber-polyurethane composite constitutes a bottom layer of said composite formed board, wherein the composite made of plastic and organic material with a fibrous structure is a foamed mix, with a density lower by at least 10% than the density of a solid organic-plastic composite made of the same components, said foamed mix layer is bonded permanently and inseparably with a solid plastic layer on the side opposite to the homogeneous rubber-polyurethane composite, the solid plastic layer constituting a top layer of said composite formed board, wherein a thickness of the solid plastic layer is smaller than that of the organic-plastic layer and the rubber-polyurethane layer.