Abstract: A core of polymer sandwich structural material (1) includes a resined cellular structure (31) with one first and one second polymer fabric sheets (8, 9) adhering in the area of an adhesive strip (17). A unit (5) includes a corrugated unit portion (12) on at least one surface (6) thereof, on which a resin is disposed and cross-linked. A production method for such a core of polymer sandwich structural material is also described.

Abstract: The invention relates to a sandwich structural material core, where said core comprises a honeycomb structure, with hexagonal cells, where the hexagonal cells comprise at least two adjacent sides connected by an edge, where the two adjacent sides have a first length and each comprise a corrugated area, one among said two adjacent sides being the image of the other adjacent side by rotation through an angle around said edge, and also where at least one of said parallel sides has a second length and is substantially flat. The first length is substantially included between 80 and 120% of said second length.

Abstract: Sheet for core of structural material sandwich extending substantially along an extension plane and having an upper surface and a lower surface which are opposite along a thickness direction, where the sheet is provided with a plurality of upper and lower surfaces for bonding near the upper and lower surfaces thereof, where the sheet comprises a three-dimensional network of edges separated by connecting surfaces, where each edge is defined by a nonplanar profiled wall delimited by an upper bonding surface, a lower bonding surface and two parallel straight lines connecting said upper and lower bonding surfaces by following an edge direction, and where each connecting surface is delimited by at least three edges.