A cross-corrugated panel has a core between two faceplates, where the core comprises two groups of corrugated elements that are perpendicular to each other. The corrugated elements have peaks and troughs connected by diagonally extending segments. In each group of corrugated elements the peaks and troughs in adjacent elements are 180 degrees out-of-phase with each other. The faceplates and the corrugated elements in each group are joined at the peaks and troughs. The diagonally extending segments of one of the elements comprise fiat strips whose fiat surfaces are parallel to each other and perpendicular to the faceplates. To make a cross-corrugated panel, a first group of elements is provided, each element being formed by oppositely winding two strips of curable material to form overlapping helixes having rectangular cross sections. The elements are positioned in parallel. A second group of elements of curable material is placed perpendicular to the first group of elements. Each such element is positioned alternately over and under adjacent elements of the first group to form peaks and troughs. The peaks and troughs of adjacent elements are 180 degrees out-of-phase with each other. Mandrels and inserts are used to form the elements in each of the groups. The elements are then disposed between two faceplates of curable material to form an assembly. The mandrels and inserts are replaced by granular particles and the assembly is cured.
Patent, Filed 13 May 95, patented 11 Mar 97
11 MAR 1997
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