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The lightweight constructional element of a sandwich structure having two cover plates comprises a honeycomb structure arranged between the cover plates which holds the cover plates spaced from each other. The honeycomb structure is formed by empty cans, especially used beverage cans, placed side by

The lightweight constructional element of a sandwich structure having two cover plates comprises a honeycomb structure arranged between the cover plates which holds the cover plates spaced from each other. The honeycomb structure is formed by empty cans, especially used beverage cans, placed side by side whose axes are at right angles to the cover plates and which are arranged in a close packed or a rectangular array. The cans may be attached by adhesive to form a low cost lightweight and strong array.

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A lightweight constructional element in a sandwich structure with two cover metal plates held by adhesion to and spaced apart by a honeycomb structure, said honeycomb structure comprising a plurality of substantially cylindrical cans, each of which has a bottom and which axes are all substantially a

A lightweight constructional element in a sandwich structure with two cover metal plates held by adhesion to and spaced apart by a honeycomb structure, said honeycomb structure comprising a plurality of substantially cylindrical cans, each of which has a bottom and which axes are all substantially at right angles to said cover plates, said cans being arranged in said honeycomb structure contacting each other at a plurality of contact points with a closest possible packing, one row of said cans being offset relative to another adjacent row of said cans by an amount corresponding to the radius of said cans, and said cans being glued together at said contact points.