Composite slab made of plastic and method for its manufacture

Abstract

A composite slab made of plastic, especially polypropylene, for construction purposes and packing purposes for example is described, said slab according to a preferred embodiment comprising a plurality of layers, each of which consists of a composite that is extruded in a plurality of layers and of which two plane layers and the others are profiled, namely layers that have a corrugated profile with peak lines that are located in a plane, with these layers being welded together along the peak lines on one side of the profiled layer and/or at the intersections of the peak lines of adjacent profiled layers. Layers consisting of a plane slab can be provided between the profiled layers. The composite extruded in several layers comprises two outer layers and a middle layer made of polymers from the same material group, whose middle layer consists of a highly crystalline polymer with incorporated stretch-resistant fibers, whose melting point is at least 15.degree. C. higher than the melting points of the polymers of the outer layers and whose modulus of elasticity is at least 10% lower than the moduli of elasticity of the polymers of the outer layers. Several variations as well as the manufacturing method for the composite slabs are described (FIG. 4).

Dependencies are inferred from the claim text.